Issue %3003 - Move libaom to libs/

23 files changed, 7103 insertions, 0 deletions

diff --git a/libs/libaom/src/examples/analyzer.cc b/libs/libaom/src/examples/analyzer.cc
new file mode 100644
index 000000000..35988211e
--- /dev/null
+++ b/libs/libaom/src/examples/analyzer.cc
@@ -0,0 +1,723 @@
+/*
+ * Copyright (c) 2017, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+#include <wx/wx.h>
+#include <wx/aboutdlg.h>
+#include <wx/cmdline.h>
+#include <wx/dcbuffer.h>
+
+#include "aom/aom_decoder.h"
+#include "aom/aomdx.h"
+#include "av1/common/av1_common_int.h"
+#include "av1/decoder/accounting.h"
+#include "av1/decoder/inspection.h"
+#include "common/tools_common.h"
+#include "common/video_reader.h"
+
+#define OD_SIGNMASK(a) (-((a) < 0))
+#define OD_FLIPSIGNI(a, b) (((a) + OD_SIGNMASK(b)) ^ OD_SIGNMASK(b))
+#define OD_DIV_ROUND(x, y) (((x) + OD_FLIPSIGNI((y) >> 1, x)) / (y))
+
+enum {
+  OD_LUMA_MASK = 1 << 0,
+  OD_CB_MASK = 1 << 1,
+  OD_CR_MASK = 1 << 2,
+  OD_ALL_MASK = OD_LUMA_MASK | OD_CB_MASK | OD_CR_MASK
+};
+
+class AV1Decoder {
+ private:
+  FILE *input;
+  wxString path;
+
+  AvxVideoReader *reader;
+  const AvxVideoInfo *info;
+  const AvxInterface *decoder;
+
+  insp_frame_data frame_data;
+
+  aom_codec_ctx_t codec;
+  bool show_padding;
+
+ public:
+  aom_image_t *image;
+  int frame;
+
+  int plane_mask;
+
+  AV1Decoder();
+  ~AV1Decoder();
+
+  bool open(const wxString &path);
+  void close();
+  bool step();
+
+  int getWidthPadding() const;
+  int getHeightPadding() const;
+  void togglePadding();
+  int getWidth() const;
+  int getHeight() const;
+
+  bool getAccountingStruct(Accounting **acct);
+  bool setInspectionCallback();
+
+  static void inspect(void *decoder, void *data);
+};
+
+AV1Decoder::AV1Decoder()
+    : reader(NULL), info(NULL), decoder(NULL), show_padding(false), image(NULL),
+      frame(0) {}
+
+AV1Decoder::~AV1Decoder() {}
+
+void AV1Decoder::togglePadding() { show_padding = !show_padding; }
+
+bool AV1Decoder::open(const wxString &path) {
+  reader = aom_video_reader_open(path.mb_str());
+  if (!reader) {
+    fprintf(stderr, "Failed to open %s for reading.", path.mb_str().data());
+    return false;
+  }
+  this->path = path;
+  info = aom_video_reader_get_info(reader);
+  decoder = get_aom_decoder_by_fourcc(info->codec_fourcc);
+  if (!decoder) {
+    fprintf(stderr, "Unknown input codec.");
+    return false;
+  }
+  printf("Using %s\n", aom_codec_iface_name(decoder->codec_interface()));
+  if (aom_codec_dec_init(&codec, decoder->codec_interface(), NULL, 0)) {
+    fprintf(stderr, "Failed to initialize decoder.");
+    return false;
+  }
+  ifd_init(&frame_data, info->frame_width, info->frame_height);
+  setInspectionCallback();
+  return true;
+}
+
+void AV1Decoder::close() {}
+
+bool AV1Decoder::step() {
+  if (aom_video_reader_read_frame(reader)) {
+    size_t frame_size;
+    const unsigned char *frame_data;
+    frame_data = aom_video_reader_get_frame(reader, &frame_size);
+    if (aom_codec_decode(&codec, frame_data, frame_size, NULL)) {
+      fprintf(stderr, "Failed to decode frame.");
+      return false;
+    } else {
+      aom_codec_iter_t iter = NULL;
+      image = aom_codec_get_frame(&codec, &iter);
+      if (image != NULL) {
+        frame++;
+        return true;
+      }
+      return false;
+    }
+  }
+  return false;
+}
+
+int AV1Decoder::getWidth() const {
+  return info->frame_width + 2 * getWidthPadding();
+}
+
+int AV1Decoder::getWidthPadding() const {
+  return show_padding ? AOMMAX(info->frame_width + 16,
+                               ALIGN_POWER_OF_TWO(info->frame_width, 6)) -
+                            info->frame_width
+                      : 0;
+}
+
+int AV1Decoder::getHeight() const {
+  return info->frame_height + 2 * getHeightPadding();
+}
+
+int AV1Decoder::getHeightPadding() const {
+  return show_padding ? AOMMAX(info->frame_height + 16,
+                               ALIGN_POWER_OF_TWO(info->frame_height, 6)) -
+                            info->frame_height
+                      : 0;
+}
+
+bool AV1Decoder::getAccountingStruct(Accounting **accounting) {
+  return aom_codec_control(&codec, AV1_GET_ACCOUNTING, accounting) ==
+         AOM_CODEC_OK;
+}
+
+bool AV1Decoder::setInspectionCallback() {
+  aom_inspect_init ii;
+  ii.inspect_cb = AV1Decoder::inspect;
+  ii.inspect_ctx = (void *)this;
+  return aom_codec_control(&codec, AV1_SET_INSPECTION_CALLBACK, &ii) ==
+         AOM_CODEC_OK;
+}
+
+void AV1Decoder::inspect(void *pbi, void *data) {
+  AV1Decoder *decoder = (AV1Decoder *)data;
+  ifd_inspect(&decoder->frame_data, pbi, 0);
+}
+
+#define MIN_ZOOM (1)
+#define MAX_ZOOM (4)
+
+class AnalyzerPanel : public wxPanel {
+  DECLARE_EVENT_TABLE()
+
+ private:
+  AV1Decoder decoder;
+  const wxString path;
+
+  int zoom;
+  unsigned char *pixels;
+
+  const bool bit_accounting;
+  double *bpp_q3;
+
+  int plane_mask;
+
+  // The display size is the decode size, scaled by the zoom.
+  int getDisplayWidth() const;
+  int getDisplayHeight() const;
+
+  bool updateDisplaySize();
+
+  void computeBitsPerPixel();
+
+ public:
+  AnalyzerPanel(wxWindow *parent, const wxString &path,
+                const bool bit_accounting);
+  ~AnalyzerPanel();
+
+  bool open(const wxString &path);
+  void close();
+  void render();
+  void togglePadding();
+  bool nextFrame();
+  void refresh();
+
+  int getZoom() const;
+  bool setZoom(int zoom);
+
+  void setShowPlane(bool show_plane, int mask);
+
+  void onPaint(wxPaintEvent &event);  // NOLINT
+};
+
+BEGIN_EVENT_TABLE(AnalyzerPanel, wxPanel)
+EVT_PAINT(AnalyzerPanel::onPaint)
+END_EVENT_TABLE()
+
+AnalyzerPanel::AnalyzerPanel(wxWindow *parent, const wxString &path,
+                             const bool bit_accounting)
+    : wxPanel(parent), path(path), zoom(0), pixels(NULL),
+      bit_accounting(bit_accounting), bpp_q3(NULL), plane_mask(OD_ALL_MASK) {}
+
+AnalyzerPanel::~AnalyzerPanel() { close(); }
+
+void AnalyzerPanel::setShowPlane(bool show_plane, int mask) {
+  if (show_plane) {
+    plane_mask |= mask;
+  } else {
+    plane_mask &= ~mask;
+  }
+}
+
+void AnalyzerPanel::render() {
+  aom_image_t *img = decoder.image;
+  const int hbd = !!(img->fmt & AOM_IMG_FMT_HIGHBITDEPTH);
+  int y_stride = img->stride[0] >> hbd;
+  int cb_stride = img->stride[1] >> hbd;
+  int cr_stride = img->stride[2] >> hbd;
+  int p_stride = 3 * getDisplayWidth();
+  unsigned char *y_row = img->planes[0];
+  unsigned char *cb_row = img->planes[1];
+  unsigned char *cr_row = img->planes[2];
+  uint16_t *y_row16 = reinterpret_cast<uint16_t *>(y_row);
+  uint16_t *cb_row16 = reinterpret_cast<uint16_t *>(cb_row);
+  uint16_t *cr_row16 = reinterpret_cast<uint16_t *>(cr_row);
+  unsigned char *p_row = pixels;
+  int y_width_padding = decoder.getWidthPadding();
+  int cb_width_padding = y_width_padding >> 1;
+  int cr_width_padding = y_width_padding >> 1;
+  int y_height_padding = decoder.getHeightPadding();
+  int cb_height_padding = y_height_padding >> 1;
+  int cr_height_padding = y_height_padding >> 1;
+  for (int j = 0; j < decoder.getHeight(); j++) {
+    unsigned char *y = y_row - y_stride * y_height_padding;
+    unsigned char *cb = cb_row - cb_stride * cb_height_padding;
+    unsigned char *cr = cr_row - cr_stride * cr_height_padding;
+    uint16_t *y16 = y_row16 - y_stride * y_height_padding;
+    uint16_t *cb16 = cb_row16 - cb_stride * cb_height_padding;
+    uint16_t *cr16 = cr_row16 - cr_stride * cr_height_padding;
+    unsigned char *p = p_row;
+    for (int i = 0; i < decoder.getWidth(); i++) {
+      int64_t yval;
+      int64_t cbval;
+      int64_t crval;
+      int pmask;
+      unsigned rval;
+      unsigned gval;
+      unsigned bval;
+      if (hbd) {
+        yval = *(y16 - y_width_padding);
+        cbval = *(cb16 - cb_width_padding);
+        crval = *(cr16 - cr_width_padding);
+      } else {
+        yval = *(y - y_width_padding);
+        cbval = *(cb - cb_width_padding);
+        crval = *(cr - cr_width_padding);
+      }
+      pmask = plane_mask;
+      if (pmask & OD_LUMA_MASK) {
+        yval -= 16;
+      } else {
+        yval = 128;
+      }
+      cbval = ((pmask & OD_CB_MASK) >> 1) * (cbval - 128);
+      crval = ((pmask & OD_CR_MASK) >> 2) * (crval - 128);
+      /*This is intentionally slow and very accurate.*/
+      rval = OD_CLAMPI(
+          0,
+          (int32_t)OD_DIV_ROUND(
+              2916394880000LL * yval + 4490222169144LL * crval, 9745792000LL),
+          65535);
+      gval = OD_CLAMPI(0,
+                       (int32_t)OD_DIV_ROUND(2916394880000LL * yval -
+                                                 534117096223LL * cbval -
+                                                 1334761232047LL * crval,
+                                             9745792000LL),
+                       65535);
+      bval = OD_CLAMPI(
+          0,
+          (int32_t)OD_DIV_ROUND(
+              2916394880000LL * yval + 5290866304968LL * cbval, 9745792000LL),
+          65535);
+      unsigned char *px_row = p;
+      for (int v = 0; v < zoom; v++) {
+        unsigned char *px = px_row;
+        for (int u = 0; u < zoom; u++) {
+          *(px + 0) = (unsigned char)(rval >> 8);
+          *(px + 1) = (unsigned char)(gval >> 8);
+          *(px + 2) = (unsigned char)(bval >> 8);
+          px += 3;
+        }
+        px_row += p_stride;
+      }
+      if (hbd) {
+        int dc = ((y16 - y_row16) & 1) | (1 - img->x_chroma_shift);
+        y16++;
+        cb16 += dc;
+        cr16 += dc;
+      } else {
+        int dc = ((y - y_row) & 1) | (1 - img->x_chroma_shift);
+        y++;
+        cb += dc;
+        cr += dc;
+      }
+      p += zoom * 3;
+    }
+    int dc = -((j & 1) | (1 - img->y_chroma_shift));
+    if (hbd) {
+      y_row16 += y_stride;
+      cb_row16 += dc & cb_stride;
+      cr_row16 += dc & cr_stride;
+    } else {
+      y_row += y_stride;
+      cb_row += dc & cb_stride;
+      cr_row += dc & cr_stride;
+    }
+    p_row += zoom * p_stride;
+  }
+}
+
+void AnalyzerPanel::computeBitsPerPixel() {
+  Accounting *acct;
+  double bpp_total;
+  int totals_q3[MAX_SYMBOL_TYPES] = { 0 };
+  int sym_count[MAX_SYMBOL_TYPES] = { 0 };
+  decoder.getAccountingStruct(&acct);
+  for (int j = 0; j < decoder.getHeight(); j++) {
+    for (int i = 0; i < decoder.getWidth(); i++) {
+      bpp_q3[j * decoder.getWidth() + i] = 0.0;
+    }
+  }
+  bpp_total = 0;
+  for (int i = 0; i < acct->syms.num_syms; i++) {
+    AccountingSymbol *s;
+    s = &acct->syms.syms[i];
+    totals_q3[s->id] += s->bits;
+    sym_count[s->id] += s->samples;
+  }
+  printf("=== Frame: %-3i ===\n", decoder.frame - 1);
+  for (int i = 0; i < acct->syms.dictionary.num_strs; i++) {
+    if (totals_q3[i]) {
+      printf("%30s = %10.3f (%f bit/symbol)\n", acct->syms.dictionary.strs[i],
+             (float)totals_q3[i] / 8, (float)totals_q3[i] / 8 / sym_count[i]);
+    }
+  }
+  printf("\n");
+}
+
+void AnalyzerPanel::togglePadding() {
+  decoder.togglePadding();
+  updateDisplaySize();
+}
+
+bool AnalyzerPanel::nextFrame() {
+  if (decoder.step()) {
+    refresh();
+    return true;
+  }
+  return false;
+}
+
+void AnalyzerPanel::refresh() {
+  if (bit_accounting) {
+    computeBitsPerPixel();
+  }
+  render();
+}
+
+int AnalyzerPanel::getDisplayWidth() const { return zoom * decoder.getWidth(); }
+
+int AnalyzerPanel::getDisplayHeight() const {
+  return zoom * decoder.getHeight();
+}
+
+bool AnalyzerPanel::updateDisplaySize() {
+  unsigned char *p = (unsigned char *)malloc(
+      sizeof(*p) * 3 * getDisplayWidth() * getDisplayHeight());
+  if (p == NULL) {
+    return false;
+  }
+  free(pixels);
+  pixels = p;
+  SetSize(getDisplayWidth(), getDisplayHeight());
+  return true;
+}
+
+bool AnalyzerPanel::open(const wxString &path) {
+  if (!decoder.open(path)) {
+    return false;
+  }
+  if (!setZoom(MIN_ZOOM)) {
+    return false;
+  }
+  if (bit_accounting) {
+    bpp_q3 = (double *)malloc(sizeof(*bpp_q3) * decoder.getWidth() *
+                              decoder.getHeight());
+    if (bpp_q3 == NULL) {
+      fprintf(stderr, "Could not allocate memory for bit accounting\n");
+      close();
+      return false;
+    }
+  }
+  if (!nextFrame()) {
+    close();
+    return false;
+  }
+  SetFocus();
+  return true;
+}
+
+void AnalyzerPanel::close() {
+  decoder.close();
+  free(pixels);
+  pixels = NULL;
+  free(bpp_q3);
+  bpp_q3 = NULL;
+}
+
+int AnalyzerPanel::getZoom() const { return zoom; }
+
+bool AnalyzerPanel::setZoom(int z) {
+  if (z <= MAX_ZOOM && z >= MIN_ZOOM && zoom != z) {
+    int old_zoom = zoom;
+    zoom = z;
+    if (!updateDisplaySize()) {
+      zoom = old_zoom;
+      return false;
+    }
+    return true;
+  }
+  return false;
+}
+
+void AnalyzerPanel::onPaint(wxPaintEvent &) {
+  wxBitmap bmp(wxImage(getDisplayWidth(), getDisplayHeight(), pixels, true));
+  wxBufferedPaintDC dc(this, bmp);
+}
+
+class AnalyzerFrame : public wxFrame {
+  DECLARE_EVENT_TABLE()
+
+ private:
+  AnalyzerPanel *panel;
+  const bool bit_accounting;
+
+  wxMenu *fileMenu;
+  wxMenu *viewMenu;
+  wxMenu *playbackMenu;
+
+ public:
+  AnalyzerFrame(const bool bit_accounting);  // NOLINT
+
+  void onOpen(wxCommandEvent &event);   // NOLINT
+  void onClose(wxCommandEvent &event);  // NOLINT
+  void onQuit(wxCommandEvent &event);   // NOLINT
+
+  void onTogglePadding(wxCommandEvent &event);  // NOLINT
+  void onZoomIn(wxCommandEvent &event);         // NOLINT
+  void onZoomOut(wxCommandEvent &event);        // NOLINT
+  void onActualSize(wxCommandEvent &event);     // NOLINT
+
+  void onToggleViewMenuCheckBox(wxCommandEvent &event);          // NOLINT
+  void onResetAndToggleViewMenuCheckBox(wxCommandEvent &event);  // NOLINT
+
+  void onNextFrame(wxCommandEvent &event);  // NOLINT
+  void onGotoFrame(wxCommandEvent &event);  // NOLINT
+  void onRestart(wxCommandEvent &event);    // NOLINT
+
+  void onAbout(wxCommandEvent &event);  // NOLINT
+
+  bool open(const wxString &path);
+  bool setZoom(int zoom);
+  void updateViewMenu();
+};
+
+enum {
+  wxID_NEXT_FRAME = 6000,
+  wxID_SHOW_Y,
+  wxID_SHOW_U,
+  wxID_SHOW_V,
+  wxID_GOTO_FRAME,
+  wxID_RESTART,
+  wxID_ACTUAL_SIZE,
+  wxID_PADDING
+};
+
+BEGIN_EVENT_TABLE(AnalyzerFrame, wxFrame)
+EVT_MENU(wxID_OPEN, AnalyzerFrame::onOpen)
+EVT_MENU(wxID_CLOSE, AnalyzerFrame::onClose)
+EVT_MENU(wxID_EXIT, AnalyzerFrame::onQuit)
+EVT_MENU(wxID_PADDING, AnalyzerFrame::onTogglePadding)
+EVT_MENU(wxID_ZOOM_IN, AnalyzerFrame::onZoomIn)
+EVT_MENU(wxID_ZOOM_OUT, AnalyzerFrame::onZoomOut)
+EVT_MENU(wxID_ACTUAL_SIZE, AnalyzerFrame::onActualSize)
+EVT_MENU(wxID_SHOW_Y, AnalyzerFrame::onResetAndToggleViewMenuCheckBox)
+EVT_MENU(wxID_SHOW_U, AnalyzerFrame::onResetAndToggleViewMenuCheckBox)
+EVT_MENU(wxID_SHOW_V, AnalyzerFrame::onResetAndToggleViewMenuCheckBox)
+EVT_MENU(wxID_NEXT_FRAME, AnalyzerFrame::onNextFrame)
+EVT_MENU(wxID_GOTO_FRAME, AnalyzerFrame::onGotoFrame)
+EVT_MENU(wxID_RESTART, AnalyzerFrame::onRestart)
+EVT_MENU(wxID_ABOUT, AnalyzerFrame::onAbout)
+END_EVENT_TABLE()
+
+AnalyzerFrame::AnalyzerFrame(const bool bit_accounting)
+    : wxFrame(NULL, wxID_ANY, _("AV1 Stream Analyzer"), wxDefaultPosition,
+              wxDefaultSize, wxDEFAULT_FRAME_STYLE),
+      panel(NULL), bit_accounting(bit_accounting) {
+  wxMenuBar *mb = new wxMenuBar();
+
+  fileMenu = new wxMenu();
+  fileMenu->Append(wxID_OPEN, _("&Open...\tCtrl-O"), _("Open AV1 file"));
+  fileMenu->Append(wxID_CLOSE, _("&Close\tCtrl-W"), _("Close AV1 file"));
+  fileMenu->Enable(wxID_CLOSE, false);
+  fileMenu->Append(wxID_EXIT, _("E&xit\tCtrl-Q"), _("Quit this program"));
+  mb->Append(fileMenu, _("&File"));
+
+  wxAcceleratorEntry entries[2];
+  entries[0].Set(wxACCEL_CTRL, (int)'=', wxID_ZOOM_IN);
+  entries[1].Set(wxACCEL_CTRL | wxACCEL_SHIFT, (int)'-', wxID_ZOOM_OUT);
+  wxAcceleratorTable accel(2, entries);
+  this->SetAcceleratorTable(accel);
+
+  viewMenu = new wxMenu();
+  +viewMenu->Append(wxID_PADDING, _("Toggle padding\tCtrl-p"),
+                    _("Show padding"));
+  viewMenu->Append(wxID_ZOOM_IN, _("Zoom-In\tCtrl-+"), _("Double image size"));
+  viewMenu->Append(wxID_ZOOM_OUT, _("Zoom-Out\tCtrl--"), _("Half image size"));
+  viewMenu->Append(wxID_ACTUAL_SIZE, _("Actual size\tCtrl-0"),
+                   _("Actual size of the frame"));
+  viewMenu->AppendSeparator();
+  viewMenu->AppendCheckItem(wxID_SHOW_Y, _("&Y plane\tCtrl-Y"),
+                            _("Show Y plane"));
+  viewMenu->AppendCheckItem(wxID_SHOW_U, _("&U plane\tCtrl-U"),
+                            _("Show U plane"));
+  viewMenu->AppendCheckItem(wxID_SHOW_V, _("&V plane\tCtrl-V"),
+                            _("Show V plane"));
+  mb->Append(viewMenu, _("&View"));
+
+  playbackMenu = new wxMenu();
+  playbackMenu->Append(wxID_NEXT_FRAME, _("Next frame\tCtrl-."),
+                       _("Go to next frame"));
+  /*playbackMenu->Append(wxID_RESTART, _("&Restart\tCtrl-R"),
+                       _("Set video to frame 0"));
+  playbackMenu->Append(wxID_GOTO_FRAME, _("Jump to Frame\tCtrl-J"),
+                       _("Go to frame number"));*/
+  mb->Append(playbackMenu, _("&Playback"));
+
+  wxMenu *helpMenu = new wxMenu();
+  helpMenu->Append(wxID_ABOUT, _("&About...\tF1"), _("Show about dialog"));
+  mb->Append(helpMenu, _("&Help"));
+
+  SetMenuBar(mb);
+
+  CreateStatusBar(1);
+}
+
+void AnalyzerFrame::onOpen(wxCommandEvent &WXUNUSED(event)) {
+  wxFileDialog openFileDialog(this, _("Open file"), wxEmptyString,
+                              wxEmptyString, _("AV1 files (*.ivf)|*.ivf"),
+                              wxFD_OPEN | wxFD_FILE_MUST_EXIST);
+  if (openFileDialog.ShowModal() != wxID_CANCEL) {
+    open(openFileDialog.GetPath());
+  }
+}
+
+void AnalyzerFrame::onClose(wxCommandEvent &WXUNUSED(event)) {}
+
+void AnalyzerFrame::onQuit(wxCommandEvent &WXUNUSED(event)) { Close(true); }
+
+void AnalyzerFrame::onTogglePadding(wxCommandEvent &WXUNUSED(event)) {
+  panel->togglePadding();
+  SetClientSize(panel->GetSize());
+  panel->render();
+  panel->Refresh();
+}
+
+void AnalyzerFrame::onZoomIn(wxCommandEvent &WXUNUSED(event)) {
+  setZoom(panel->getZoom() + 1);
+}
+
+void AnalyzerFrame::onZoomOut(wxCommandEvent &WXUNUSED(event)) {
+  setZoom(panel->getZoom() - 1);
+}
+
+void AnalyzerFrame::onActualSize(wxCommandEvent &WXUNUSED(event)) {
+  setZoom(MIN_ZOOM);
+}
+
+void AnalyzerFrame::onToggleViewMenuCheckBox(wxCommandEvent &event) {  // NOLINT
+  GetMenuBar()->Check(event.GetId(), event.IsChecked());
+  updateViewMenu();
+}
+
+void AnalyzerFrame::onResetAndToggleViewMenuCheckBox(
+    wxCommandEvent &event) {  // NOLINT
+  int id = event.GetId();
+  if (id != wxID_SHOW_Y && id != wxID_SHOW_U && id != wxID_SHOW_V) {
+    GetMenuBar()->Check(wxID_SHOW_Y, true);
+    GetMenuBar()->Check(wxID_SHOW_U, true);
+    GetMenuBar()->Check(wxID_SHOW_V, true);
+  }
+  onToggleViewMenuCheckBox(event);
+}
+
+void AnalyzerFrame::onNextFrame(wxCommandEvent &WXUNUSED(event)) {
+  panel->nextFrame();
+  panel->Refresh(false);
+}
+
+void AnalyzerFrame::onGotoFrame(wxCommandEvent &WXUNUSED(event)) {}
+
+void AnalyzerFrame::onRestart(wxCommandEvent &WXUNUSED(event)) {}
+
+void AnalyzerFrame::onAbout(wxCommandEvent &WXUNUSED(event)) {
+  wxAboutDialogInfo info;
+  info.SetName(_("AV1 Bitstream Analyzer"));
+  info.SetVersion(_("0.1-beta"));
+  info.SetDescription(
+      _("This program implements a bitstream analyzer for AV1"));
+  info.SetCopyright(
+      wxT("(C) 2017 Alliance for Open Media <negge@mozilla.com>"));
+  wxAboutBox(info);
+}
+
+bool AnalyzerFrame::open(const wxString &path) {
+  panel = new AnalyzerPanel(this, path, bit_accounting);
+  if (panel->open(path)) {
+    SetClientSize(panel->GetSize());
+    return true;
+  } else {
+    delete panel;
+    return false;
+  }
+}
+
+bool AnalyzerFrame::setZoom(int zoom) {
+  if (panel->setZoom(zoom)) {
+    GetMenuBar()->Enable(wxID_ACTUAL_SIZE, zoom != MIN_ZOOM);
+    GetMenuBar()->Enable(wxID_ZOOM_IN, zoom != MAX_ZOOM);
+    GetMenuBar()->Enable(wxID_ZOOM_OUT, zoom != MIN_ZOOM);
+    SetClientSize(panel->GetSize());
+    panel->render();
+    panel->Refresh();
+    return true;
+  }
+  return false;
+}
+
+void AnalyzerFrame::updateViewMenu() {
+  panel->setShowPlane(GetMenuBar()->IsChecked(wxID_SHOW_Y), OD_LUMA_MASK);
+  panel->setShowPlane(GetMenuBar()->IsChecked(wxID_SHOW_U), OD_CB_MASK);
+  panel->setShowPlane(GetMenuBar()->IsChecked(wxID_SHOW_V), OD_CR_MASK);
+  SetClientSize(panel->GetSize());
+  panel->render();
+  panel->Refresh(false);
+}
+
+class Analyzer : public wxApp {
+ private:
+  AnalyzerFrame *frame;
+
+ public:
+  void OnInitCmdLine(wxCmdLineParser &parser);    // NOLINT
+  bool OnCmdLineParsed(wxCmdLineParser &parser);  // NOLINT
+};
+
+static const wxCmdLineEntryDesc CMD_LINE_DESC[] = {
+  { wxCMD_LINE_SWITCH, _("h"), _("help"), _("Display this help and exit."),
+    wxCMD_LINE_VAL_NONE, wxCMD_LINE_OPTION_HELP },
+  { wxCMD_LINE_SWITCH, _("a"), _("bit-accounting"), _("Enable bit accounting"),
+    wxCMD_LINE_VAL_NONE, wxCMD_LINE_PARAM_OPTIONAL },
+  { wxCMD_LINE_PARAM, NULL, NULL, _("input.ivf"), wxCMD_LINE_VAL_STRING,
+    wxCMD_LINE_PARAM_OPTIONAL },
+  { wxCMD_LINE_NONE }
+};
+
+void Analyzer::OnInitCmdLine(wxCmdLineParser &parser) {  // NOLINT
+  parser.SetDesc(CMD_LINE_DESC);
+  parser.SetSwitchChars(_("-"));
+}
+
+bool Analyzer::OnCmdLineParsed(wxCmdLineParser &parser) {  // NOLINT
+  bool bit_accounting = parser.Found(_("a"));
+  if (bit_accounting && !CONFIG_ACCOUNTING) {
+    fprintf(stderr,
+            "Bit accounting support not found. "
+            "Recompile with:\n./cmake -DCONFIG_ACCOUNTING=1\n");
+    return false;
+  }
+  frame = new AnalyzerFrame(parser.Found(_("a")));
+  frame->Show();
+  if (parser.GetParamCount() > 0) {
+    return frame->open(parser.GetParam(0));
+  }
+  return true;
+}
+
+void usage_exit(void) {
+  fprintf(stderr, "uhh\n");
+  exit(EXIT_FAILURE);
+}
+
+IMPLEMENT_APP(Analyzer)
diff --git a/libs/libaom/src/examples/aom_cx_set_ref.c b/libs/libaom/src/examples/aom_cx_set_ref.c
new file mode 100644
index 000000000..2f4f6586f
--- /dev/null
+++ b/libs/libaom/src/examples/aom_cx_set_ref.c
@@ -0,0 +1,383 @@
+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+// AV1 Set Reference Frame
+// ============================
+//
+// This is an example demonstrating how to overwrite the AV1 encoder's
+// internal reference frame. In the sample we set the last frame to the
+// current frame. This technique could be used to bounce between two cameras.
+//
+// The decoder would also have to set the reference frame to the same value
+// on the same frame, or the video will become corrupt. The 'test_decode'
+// variable is set to 1 in this example that tests if the encoder and decoder
+// results are matching.
+//
+// Usage
+// -----
+// This example encodes a raw video. And the last argument passed in specifies
+// the frame number to update the reference frame on. For example, run
+// examples/aom_cx_set_ref av1 352 288 in.yuv out.ivf 4 30
+// The parameter is parsed as follows:
+//
+//
+// Extra Variables
+// ---------------
+// This example maintains the frame number passed on the command line
+// in the `update_frame_num` variable.
+//
+//
+// Configuration
+// -------------
+//
+// The reference frame is updated on the frame specified on the command
+// line.
+//
+// Observing The Effects
+// ---------------------
+// The encoder and decoder results should be matching when the same reference
+// frame setting operation is done in both encoder and decoder. Otherwise,
+// the encoder/decoder mismatch would be seen.
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "aom/aom_decoder.h"
+#include "aom/aom_encoder.h"
+#include "aom/aomcx.h"
+#include "aom_scale/yv12config.h"
+#include "common/tools_common.h"
+#include "common/video_writer.h"
+#include "examples/encoder_util.h"
+
+static const char *exec_name;
+
+void usage_exit() {
+  fprintf(stderr,
+          "Usage: %s <codec> <width> <height> <infile> <outfile> "
+          "<frame> <limit(optional)>\n",
+          exec_name);
+  exit(EXIT_FAILURE);
+}
+
+static void testing_decode(aom_codec_ctx_t *encoder, aom_codec_ctx_t *decoder,
+                           unsigned int frame_out, int *mismatch_seen) {
+  aom_image_t enc_img, dec_img;
+
+  if (*mismatch_seen) return;
+
+  /* Get the internal reference frame */
+  if (aom_codec_control(encoder, AV1_GET_NEW_FRAME_IMAGE, &enc_img))
+    die_codec(encoder, "Failed to get encoder reference frame");
+  if (aom_codec_control(decoder, AV1_GET_NEW_FRAME_IMAGE, &dec_img))
+    die_codec(decoder, "Failed to get decoder reference frame");
+
+  if ((enc_img.fmt & AOM_IMG_FMT_HIGHBITDEPTH) !=
+      (dec_img.fmt & AOM_IMG_FMT_HIGHBITDEPTH)) {
+    if (enc_img.fmt & AOM_IMG_FMT_HIGHBITDEPTH) {
+      aom_image_t enc_hbd_img;
+      aom_img_alloc(&enc_hbd_img, enc_img.fmt - AOM_IMG_FMT_HIGHBITDEPTH,
+                    enc_img.d_w, enc_img.d_h, 16);
+      aom_img_truncate_16_to_8(&enc_hbd_img, &enc_img);
+      enc_img = enc_hbd_img;
+    }
+    if (dec_img.fmt & AOM_IMG_FMT_HIGHBITDEPTH) {
+      aom_image_t dec_hbd_img;
+      aom_img_alloc(&dec_hbd_img, dec_img.fmt - AOM_IMG_FMT_HIGHBITDEPTH,
+                    dec_img.d_w, dec_img.d_h, 16);
+      aom_img_truncate_16_to_8(&dec_hbd_img, &dec_img);
+      dec_img = dec_hbd_img;
+    }
+  }
+
+  if (!aom_compare_img(&enc_img, &dec_img)) {
+    int y[4], u[4], v[4];
+    if (enc_img.fmt & AOM_IMG_FMT_HIGHBITDEPTH) {
+      aom_find_mismatch_high(&enc_img, &dec_img, y, u, v);
+    } else {
+      aom_find_mismatch(&enc_img, &dec_img, y, u, v);
+    }
+
+    printf(
+        "Encode/decode mismatch on frame %d at"
+        " Y[%d, %d] {%d/%d},"
+        " U[%d, %d] {%d/%d},"
+        " V[%d, %d] {%d/%d}",
+        frame_out, y[0], y[1], y[2], y[3], u[0], u[1], u[2], u[3], v[0], v[1],
+        v[2], v[3]);
+    *mismatch_seen = 1;
+  }
+
+  aom_img_free(&enc_img);
+  aom_img_free(&dec_img);
+}
+
+static int encode_frame(aom_codec_ctx_t *ecodec, aom_image_t *img,
+                        unsigned int frame_in, AvxVideoWriter *writer,
+                        int test_decode, aom_codec_ctx_t *dcodec,
+                        unsigned int *frame_out, int *mismatch_seen,
+                        aom_image_t *ext_ref) {
+  int got_pkts = 0;
+  aom_codec_iter_t iter = NULL;
+  const aom_codec_cx_pkt_t *pkt = NULL;
+  int got_data;
+  const aom_codec_err_t res = aom_codec_encode(ecodec, img, frame_in, 1, 0);
+  if (res != AOM_CODEC_OK) die_codec(ecodec, "Failed to encode frame");
+
+  got_data = 0;
+
+  while ((pkt = aom_codec_get_cx_data(ecodec, &iter)) != NULL) {
+    got_pkts = 1;
+
+    if (pkt->kind == AOM_CODEC_CX_FRAME_PKT) {
+      const int keyframe = (pkt->data.frame.flags & AOM_FRAME_IS_KEY) != 0;
+
+      ++*frame_out;
+
+      if (!aom_video_writer_write_frame(writer, pkt->data.frame.buf,
+                                        pkt->data.frame.sz,
+                                        pkt->data.frame.pts)) {
+        die_codec(ecodec, "Failed to write compressed frame");
+      }
+      printf(keyframe ? "K" : ".");
+      fflush(stdout);
+      got_data = 1;
+
+      // Decode 1 frame.
+      if (test_decode) {
+        if (aom_codec_decode(dcodec, pkt->data.frame.buf,
+                             (unsigned int)pkt->data.frame.sz, NULL))
+          die_codec(dcodec, "Failed to decode frame.");
+
+        // Copy out first decoded frame, and use it as reference later.
+        if (*frame_out == 1 && ext_ref != NULL)
+          if (aom_codec_control(dcodec, AV1_COPY_NEW_FRAME_IMAGE, ext_ref))
+            die_codec(dcodec, "Failed to get decoder new frame");
+      }
+    }
+  }
+
+  // Mismatch checking
+  if (got_data && test_decode) {
+    testing_decode(ecodec, dcodec, *frame_out, mismatch_seen);
+  }
+
+  return got_pkts;
+}
+
+int main(int argc, char **argv) {
+  FILE *infile = NULL;
+  // Encoder
+  aom_codec_ctx_t ecodec;
+  aom_codec_enc_cfg_t cfg;
+  unsigned int frame_in = 0;
+  aom_image_t raw;
+  aom_image_t raw_shift;
+  aom_image_t ext_ref;
+  aom_codec_err_t res;
+  AvxVideoInfo info;
+  AvxVideoWriter *writer = NULL;
+  const AvxInterface *encoder = NULL;
+  int flags = 0;
+  int allocated_raw_shift = 0;
+  aom_img_fmt_t raw_fmt = AOM_IMG_FMT_I420;
+  aom_img_fmt_t ref_fmt = AOM_IMG_FMT_I420;
+
+  // Test encoder/decoder mismatch.
+  int test_decode = 1;
+  // Decoder
+  aom_codec_ctx_t dcodec;
+  unsigned int frame_out = 0;
+
+  // The frame number to set reference frame on
+  unsigned int update_frame_num = 0;
+  int mismatch_seen = 0;
+
+  const int fps = 30;
+  const int bitrate = 500;
+
+  const char *codec_arg = NULL;
+  const char *width_arg = NULL;
+  const char *height_arg = NULL;
+  const char *infile_arg = NULL;
+  const char *outfile_arg = NULL;
+  const char *update_frame_num_arg = NULL;
+  unsigned int limit = 0;
+  exec_name = argv[0];
+
+  // Clear explicitly, as simply assigning "{ 0 }" generates
+  // "missing-field-initializers" warning in some compilers.
+  memset(&ecodec, 0, sizeof(ecodec));
+  memset(&cfg, 0, sizeof(cfg));
+  memset(&info, 0, sizeof(info));
+
+  if (argc < 7) die("Invalid number of arguments");
+
+  codec_arg = argv[1];
+  width_arg = argv[2];
+  height_arg = argv[3];
+  infile_arg = argv[4];
+  outfile_arg = argv[5];
+  update_frame_num_arg = argv[6];
+
+  encoder = get_aom_encoder_by_name(codec_arg);
+  if (!encoder) die("Unsupported codec.");
+
+  update_frame_num = (unsigned int)strtoul(update_frame_num_arg, NULL, 0);
+  // In AV1, the reference buffers (cm->buffer_pool->frame_bufs[i].buf) are
+  // allocated while calling aom_codec_encode(), thus, setting reference for
+  // 1st frame isn't supported.
+  if (update_frame_num <= 1) {
+    die("Couldn't parse frame number '%s'\n", update_frame_num_arg);
+  }
+
+  if (argc > 7) {
+    limit = (unsigned int)strtoul(argv[7], NULL, 0);
+    if (update_frame_num > limit)
+      die("Update frame number couldn't larger than limit\n");
+  }
+
+  info.codec_fourcc = encoder->fourcc;
+  info.frame_width = (int)strtol(width_arg, NULL, 0);
+  info.frame_height = (int)strtol(height_arg, NULL, 0);
+  info.time_base.numerator = 1;
+  info.time_base.denominator = fps;
+
+  if (info.frame_width <= 0 || info.frame_height <= 0) {
+    die("Invalid frame size: %dx%d", info.frame_width, info.frame_height);
+  }
+
+  // In this test, the bit depth of input video is 8-bit, and the input format
+  // is AOM_IMG_FMT_I420.
+  if (!aom_img_alloc(&raw, raw_fmt, info.frame_width, info.frame_height, 32)) {
+    die("Failed to allocate image.");
+  }
+
+  if (FORCE_HIGHBITDEPTH_DECODING) ref_fmt |= AOM_IMG_FMT_HIGHBITDEPTH;
+  // Allocate memory with the border so that it can be used as a reference.
+  if (!aom_img_alloc_with_border(&ext_ref, ref_fmt, info.frame_width,
+                                 info.frame_height, 32, 8,
+                                 AOM_BORDER_IN_PIXELS)) {
+    die("Failed to allocate image.");
+  }
+
+  printf("Using %s\n", aom_codec_iface_name(encoder->codec_interface()));
+
+  res = aom_codec_enc_config_default(encoder->codec_interface(), &cfg, 0);
+  if (res) die_codec(&ecodec, "Failed to get default codec config.");
+
+  cfg.g_w = info.frame_width;
+  cfg.g_h = info.frame_height;
+  cfg.g_timebase.num = info.time_base.numerator;
+  cfg.g_timebase.den = info.time_base.denominator;
+  cfg.rc_target_bitrate = bitrate;
+  cfg.g_lag_in_frames = 3;
+  cfg.g_bit_depth = AOM_BITS_8;
+
+  flags |= (cfg.g_bit_depth > AOM_BITS_8 || FORCE_HIGHBITDEPTH_DECODING)
+               ? AOM_CODEC_USE_HIGHBITDEPTH
+               : 0;
+
+  writer = aom_video_writer_open(outfile_arg, kContainerIVF, &info);
+  if (!writer) die("Failed to open %s for writing.", outfile_arg);
+
+  if (!(infile = fopen(infile_arg, "rb")))
+    die("Failed to open %s for reading.", infile_arg);
+
+  if (aom_codec_enc_init(&ecodec, encoder->codec_interface(), &cfg, flags))
+    die_codec(&ecodec, "Failed to initialize encoder");
+
+  // Disable alt_ref.
+  if (aom_codec_control(&ecodec, AOME_SET_ENABLEAUTOALTREF, 0))
+    die_codec(&ecodec, "Failed to set enable auto alt ref");
+
+  if (test_decode) {
+    const AvxInterface *decoder = get_aom_decoder_by_name(codec_arg);
+    if (aom_codec_dec_init(&dcodec, decoder->codec_interface(), NULL, 0))
+      die_codec(&dcodec, "Failed to initialize decoder.");
+  }
+
+  // Encode frames.
+  while (aom_img_read(&raw, infile)) {
+    if (limit && frame_in >= limit) break;
+    aom_image_t *frame_to_encode;
+
+    if (FORCE_HIGHBITDEPTH_DECODING) {
+      // Need to allocate larger buffer to use hbd internal.
+      int input_shift = 0;
+      if (!allocated_raw_shift) {
+        aom_img_alloc(&raw_shift, raw_fmt | AOM_IMG_FMT_HIGHBITDEPTH,
+                      info.frame_width, info.frame_height, 32);
+        allocated_raw_shift = 1;
+      }
+      aom_img_upshift(&raw_shift, &raw, input_shift);
+      frame_to_encode = &raw_shift;
+    } else {
+      frame_to_encode = &raw;
+    }
+
+    if (update_frame_num > 1 && frame_out + 1 == update_frame_num) {
+      av1_ref_frame_t ref;
+      ref.idx = 0;
+      ref.use_external_ref = 0;
+      ref.img = ext_ref;
+      // Set reference frame in encoder.
+      if (aom_codec_control(&ecodec, AV1_SET_REFERENCE, &ref))
+        die_codec(&ecodec, "Failed to set encoder reference frame");
+      printf(" <SET_REF>");
+
+      // If set_reference in decoder is commented out, the enc/dec mismatch
+      // would be seen.
+      if (test_decode) {
+        ref.use_external_ref = 1;
+        if (aom_codec_control(&dcodec, AV1_SET_REFERENCE, &ref))
+          die_codec(&dcodec, "Failed to set decoder reference frame");
+      }
+    }
+
+    encode_frame(&ecodec, frame_to_encode, frame_in, writer, test_decode,
+                 &dcodec, &frame_out, &mismatch_seen, &ext_ref);
+    frame_in++;
+    if (mismatch_seen) break;
+  }
+
+  // Flush encoder.
+  if (!mismatch_seen)
+    while (encode_frame(&ecodec, NULL, frame_in, writer, test_decode, &dcodec,
+                        &frame_out, &mismatch_seen, NULL)) {
+    }
+
+  printf("\n");
+  fclose(infile);
+  printf("Processed %d frames.\n", frame_out);
+
+  if (test_decode) {
+    if (!mismatch_seen)
+      printf("Encoder/decoder results are matching.\n");
+    else
+      printf("Encoder/decoder results are NOT matching.\n");
+  }
+
+  if (test_decode)
+    if (aom_codec_destroy(&dcodec))
+      die_codec(&dcodec, "Failed to destroy decoder");
+
+  if (allocated_raw_shift) aom_img_free(&raw_shift);
+  aom_img_free(&ext_ref);
+  aom_img_free(&raw);
+  if (aom_codec_destroy(&ecodec))
+    die_codec(&ecodec, "Failed to destroy encoder.");
+
+  aom_video_writer_close(writer);
+
+  return EXIT_SUCCESS;
+}
diff --git a/libs/libaom/src/examples/av1_dec_fuzzer.cc b/libs/libaom/src/examples/av1_dec_fuzzer.cc
new file mode 100644
index 000000000..1cddc8cc1
--- /dev/null
+++ b/libs/libaom/src/examples/av1_dec_fuzzer.cc
@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 2019, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+/*
+ * See build_av1_dec_fuzzer.sh for building instructions.
+ */
+
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <algorithm>
+#include <memory>
+#include "config/aom_config.h"
+#include "aom/aom_decoder.h"
+#include "aom/aomdx.h"
+#include "aom_ports/mem_ops.h"
+
+#define IVF_FRAME_HDR_SZ (4 + 8) /* 4 byte size + 8 byte timestamp */
+#define IVF_FILE_HDR_SZ 32
+
+extern "C" void usage_exit(void) { exit(EXIT_FAILURE); }
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+  if (size <= IVF_FILE_HDR_SZ) {
+    return 0;
+  }
+
+  const aom_codec_iface_t *codec_interface = aom_codec_av1_dx();
+  aom_codec_ctx_t codec;
+  // Set thread count in the range [1, 64].
+  const unsigned int threads = (data[IVF_FILE_HDR_SZ] & 0x3f) + 1;
+  aom_codec_dec_cfg_t cfg = { threads, 0, 0, !FORCE_HIGHBITDEPTH_DECODING };
+  if (aom_codec_dec_init(&codec, codec_interface, &cfg, 0)) {
+    return 0;
+  }
+
+  data += IVF_FILE_HDR_SZ;
+  size -= IVF_FILE_HDR_SZ;
+
+  while (size > IVF_FRAME_HDR_SZ) {
+    size_t frame_size = mem_get_le32(data);
+    size -= IVF_FRAME_HDR_SZ;
+    data += IVF_FRAME_HDR_SZ;
+    frame_size = std::min(size, frame_size);
+
+    const aom_codec_err_t err =
+        aom_codec_decode(&codec, data, frame_size, nullptr);
+    static_cast<void>(err);
+    aom_codec_iter_t iter = nullptr;
+    aom_image_t *img = nullptr;
+    while ((img = aom_codec_get_frame(&codec, &iter)) != nullptr) {
+    }
+    data += frame_size;
+    size -= frame_size;
+  }
+  aom_codec_destroy(&codec);
+  return 0;
+}
diff --git a/libs/libaom/src/examples/build_av1_dec_fuzzer.sh b/libs/libaom/src/examples/build_av1_dec_fuzzer.sh
new file mode 100644
index 000000000..0dcb254da
--- /dev/null
+++ b/libs/libaom/src/examples/build_av1_dec_fuzzer.sh
@@ -0,0 +1,70 @@
+#!/bin/bash
+#
+# Copyright (c) 2019, Alliance for Open Media. All rights reserved
+#
+# This source code is subject to the terms of the BSD 2 Clause License and
+# the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+# was not distributed with this source code in the LICENSE file, you can
+# obtain it at www.aomedia.org/license/software. If the Alliance for Open
+# Media Patent License 1.0 was not distributed with this source code in the
+# PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+#
+###############################################################################
+# Fuzzer for libaom decoder.
+# ==========================
+# Requirements
+# ---------------------
+# Clang6.0 or above (must support -fsanitize=fuzzer -fsanitize=fuzzer-no-link)
+#
+# References:
+# ---------------------
+# http://llvm.org/docs/LibFuzzer.html
+# https://github.com/google/oss-fuzz
+#
+# Steps to build / run
+# ---------------------
+
+set -eu
+
+# Have a copy of AOM and a build directory ready.
+if [[ $# -ne 2 ]]; then
+  echo "Pass in the AOM source tree as first argument, and a build directory "
+  echo "as the second argument. The AOM source tree can be obtained via: "
+  echo "  git clone https://aomedia.googlesource.com/aom"
+  exit 2
+fi
+if [[ -z "$CC" ]]; then
+  echo "Set the CC environment variable to point to your C compiler."
+  exit 2
+fi
+if [[ -z "$CXX" ]]; then
+  echo "Set the CXX environment variable to point to your C++ compiler."
+  exit 2
+fi
+
+AOM_DIR=$1
+BUILD_DIR=$2
+# Run CMake with address sanitizer enabled and build the codec.
+# Enable DO_RANGE_CHECK_CLAMP to suppress the noise of integer overflows
+# in the transform functions. Also set memory limits.
+EXTRA_C_FLAGS='-DDO_RANGE_CHECK_CLAMP=1 -DAOM_MAX_ALLOCABLE_MEMORY=1073741824'
+cd "${BUILD_DIR}"
+cmake "${AOM_DIR}" -DCMAKE_BUILD_TYPE=RelWithDebInfo -DCONFIG_PIC=1 \
+  -DCONFIG_SCALABILITY=0 -DFORCE_HIGHBITDEPTH_DECODING=0 \
+  -DCONFIG_AV1_ENCODER=0 -DENABLE_EXAMPLES=0 -DENABLE_DOCS=0 -DENABLE_TESTS=0 \
+  -DCONFIG_SIZE_LIMIT=1 -DDECODE_HEIGHT_LIMIT=12288 -DDECODE_WIDTH_LIMIT=12288 \
+  -DAOM_EXTRA_C_FLAGS="${EXTRA_C_FLAGS}" \
+  -DAOM_EXTRA_CXX_FLAGS="${EXTRA_C_FLAGS}" -DSANITIZE=fuzzer-no-link,address
+
+# Build the codec.
+make -j$(nproc)
+
+# Build the av1 fuzzer
+$CXX -std=c++11 -DDECODER=av1 -I${AOM_DIR} -I${BUILD_DIR} \
+    -fsanitize=fuzzer,address -Wl,--start-group \
+    ${AOM_DIR}/examples/av1_dec_fuzzer.cc -o ${BUILD_DIR}/av1_dec_fuzzer \
+    ${BUILD_DIR}/libaom.a -Wl,--end-group
+
+echo "Fuzzer built at ${BUILD_DIR}/av1_dec_fuzzer."
+echo "Create a corpus directory, copy IVF files in there, and run:"
+echo "  av1_dec_fuzzer CORPUS_DIR"
diff --git a/libs/libaom/src/examples/decode_to_md5.c b/libs/libaom/src/examples/decode_to_md5.c
new file mode 100644
index 000000000..bc127b78d
--- /dev/null
+++ b/libs/libaom/src/examples/decode_to_md5.c
@@ -0,0 +1,131 @@
+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+// Frame-by-frame MD5 Checksum
+// ===========================
+//
+// This example builds upon the simple decoder loop to show how checksums
+// of the decoded output can be generated. These are used for validating
+// decoder implementations against the reference implementation, for example.
+//
+// MD5 algorithm
+// -------------
+// The Message-Digest 5 (MD5) is a well known hash function. We have provided
+// an implementation derived from the RSA Data Security, Inc. MD5 Message-Digest
+// Algorithm for your use. Our implmentation only changes the interface of this
+// reference code. You must include the `md5_utils.h` header for access to these
+// functions.
+//
+// Processing The Decoded Data
+// ---------------------------
+// Each row of the image is passed to the MD5 accumulator. First the Y plane
+// is processed, then U, then V. It is important to honor the image's `stride`
+// values.
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "aom/aom_decoder.h"
+#include "aom/aomdx.h"
+#include "common/md5_utils.h"
+#include "common/tools_common.h"
+#include "common/video_reader.h"
+
+static void get_image_md5(const aom_image_t *img, unsigned char digest[16]) {
+  int plane, y;
+  MD5Context md5;
+
+  MD5Init(&md5);
+
+  for (plane = 0; plane < 3; ++plane) {
+    const unsigned char *buf = img->planes[plane];
+    const int stride = img->stride[plane];
+    const int w = plane ? (img->d_w + 1) >> 1 : img->d_w;
+    const int h = plane ? (img->d_h + 1) >> 1 : img->d_h;
+
+    for (y = 0; y < h; ++y) {
+      MD5Update(&md5, buf, w);
+      buf += stride;
+    }
+  }
+
+  MD5Final(digest, &md5);
+}
+
+static void print_md5(FILE *stream, unsigned char digest[16]) {
+  int i;
+
+  for (i = 0; i < 16; ++i) fprintf(stream, "%02x", digest[i]);
+}
+
+static const char *exec_name;
+
+void usage_exit(void) {
+  fprintf(stderr, "Usage: %s <infile> <outfile>\n", exec_name);
+  exit(EXIT_FAILURE);
+}
+
+int main(int argc, char **argv) {
+  int frame_cnt = 0;
+  FILE *outfile = NULL;
+  aom_codec_ctx_t codec;
+  AvxVideoReader *reader = NULL;
+  const AvxVideoInfo *info = NULL;
+  const AvxInterface *decoder = NULL;
+
+  exec_name = argv[0];
+
+  if (argc != 3) die("Invalid number of arguments.");
+
+  reader = aom_video_reader_open(argv[1]);
+  if (!reader) die("Failed to open %s for reading.", argv[1]);
+
+  if (!(outfile = fopen(argv[2], "wb")))
+    die("Failed to open %s for writing.", argv[2]);
+
+  info = aom_video_reader_get_info(reader);
+
+  decoder = get_aom_decoder_by_fourcc(info->codec_fourcc);
+  if (!decoder) die("Unknown input codec.");
+
+  printf("Using %s\n", aom_codec_iface_name(decoder->codec_interface()));
+
+  if (aom_codec_dec_init(&codec, decoder->codec_interface(), NULL, 0))
+    die_codec(&codec, "Failed to initialize decoder");
+
+  while (aom_video_reader_read_frame(reader)) {
+    aom_codec_iter_t iter = NULL;
+    aom_image_t *img = NULL;
+    size_t frame_size = 0;
+    const unsigned char *frame =
+        aom_video_reader_get_frame(reader, &frame_size);
+    if (aom_codec_decode(&codec, frame, frame_size, NULL))
+      die_codec(&codec, "Failed to decode frame");
+
+    while ((img = aom_codec_get_frame(&codec, &iter)) != NULL) {
+      unsigned char digest[16];
+
+      get_image_md5(img, digest);
+      print_md5(outfile, digest);
+      fprintf(outfile, "  img-%dx%d-%04d.i420\n", img->d_w, img->d_h,
+              ++frame_cnt);
+    }
+  }
+
+  printf("Processed %d frames.\n", frame_cnt);
+  if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec.");
+
+  aom_video_reader_close(reader);
+
+  fclose(outfile);
+  return EXIT_SUCCESS;
+}
diff --git a/libs/libaom/src/examples/decode_with_drops.c b/libs/libaom/src/examples/decode_with_drops.c
new file mode 100644
index 000000000..214401958
--- /dev/null
+++ b/libs/libaom/src/examples/decode_with_drops.c
@@ -0,0 +1,146 @@
+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+// Decode With Drops Example
+// =========================
+//
+// This is an example utility which drops a series of frames, as specified
+// on the command line. This is useful for observing the error recovery
+// features of the codec.
+//
+// Usage
+// -----
+// This example adds a single argument to the `simple_decoder` example,
+// which specifies the range or pattern of frames to drop. The parameter is
+// parsed as follows:
+//
+// Dropping A Range Of Frames
+// --------------------------
+// To drop a range of frames, specify the starting frame and the ending
+// frame to drop, separated by a dash. The following command will drop
+// frames 5 through 10 (base 1).
+//
+//  $ ./decode_with_drops in.ivf out.i420 5-10
+//
+//
+// Dropping A Pattern Of Frames
+// ----------------------------
+// To drop a pattern of frames, specify the number of frames to drop and
+// the number of frames after which to repeat the pattern, separated by
+// a forward-slash. The following command will drop 3 of 7 frames.
+// Specifically, it will decode 4 frames, then drop 3 frames, and then
+// repeat.
+//
+//  $ ./decode_with_drops in.ivf out.i420 3/7
+//
+//
+// Extra Variables
+// ---------------
+// This example maintains the pattern passed on the command line in the
+// `n`, `m`, and `is_range` variables:
+//
+//
+// Making The Drop Decision
+// ------------------------
+// The example decides whether to drop the frame based on the current
+// frame number, immediately before decoding the frame.
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "aom/aom_decoder.h"
+#include "aom/aomdx.h"
+#include "common/tools_common.h"
+#include "common/video_reader.h"
+
+static const char *exec_name;
+
+void usage_exit(void) {
+  fprintf(stderr, "Usage: %s <infile> <outfile> <N-M|N/M>\n", exec_name);
+  exit(EXIT_FAILURE);
+}
+
+int main(int argc, char **argv) {
+  int frame_cnt = 0;
+  FILE *outfile = NULL;
+  aom_codec_ctx_t codec;
+  const AvxInterface *decoder = NULL;
+  AvxVideoReader *reader = NULL;
+  const AvxVideoInfo *info = NULL;
+  int n = 0;
+  int m = 0;
+  int is_range = 0;
+  char *nptr = NULL;
+
+  exec_name = argv[0];
+
+  if (argc != 4) die("Invalid number of arguments.");
+
+  reader = aom_video_reader_open(argv[1]);
+  if (!reader) die("Failed to open %s for reading.", argv[1]);
+
+  if (!(outfile = fopen(argv[2], "wb")))
+    die("Failed to open %s for writing.", argv[2]);
+
+  n = (int)strtol(argv[3], &nptr, 0);
+  m = (int)strtol(nptr + 1, NULL, 0);
+  is_range = (*nptr == '-');
+  if (!n || !m || (*nptr != '-' && *nptr != '/'))
+    die("Couldn't parse pattern %s.\n", argv[3]);
+
+  info = aom_video_reader_get_info(reader);
+
+  decoder = get_aom_decoder_by_fourcc(info->codec_fourcc);
+  if (!decoder) die("Unknown input codec.");
+
+  printf("Using %s\n", aom_codec_iface_name(decoder->codec_interface()));
+
+  if (aom_codec_dec_init(&codec, decoder->codec_interface(), NULL, 0))
+    die_codec(&codec, "Failed to initialize decoder.");
+
+  while (aom_video_reader_read_frame(reader)) {
+    aom_codec_iter_t iter = NULL;
+    aom_image_t *img = NULL;
+    size_t frame_size = 0;
+    int skip;
+    const unsigned char *frame =
+        aom_video_reader_get_frame(reader, &frame_size);
+    ++frame_cnt;
+
+    skip = (is_range && frame_cnt >= n && frame_cnt <= m) ||
+           (!is_range && m - (frame_cnt - 1) % m <= n);
+
+    if (!skip) {
+      putc('.', stdout);
+      if (aom_codec_decode(&codec, frame, frame_size, NULL))
+        die_codec(&codec, "Failed to decode frame.");
+
+      while ((img = aom_codec_get_frame(&codec, &iter)) != NULL)
+        aom_img_write(img, outfile);
+    } else {
+      putc('X', stdout);
+    }
+
+    fflush(stdout);
+  }
+
+  printf("Processed %d frames.\n", frame_cnt);
+  if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec.");
+
+  printf("Play: ffplay -f rawvideo -pix_fmt yuv420p -s %dx%d %s\n",
+         info->frame_width, info->frame_height, argv[2]);
+
+  aom_video_reader_close(reader);
+  fclose(outfile);
+
+  return EXIT_SUCCESS;
+}
diff --git a/libs/libaom/src/examples/encoder_util.c b/libs/libaom/src/examples/encoder_util.c
new file mode 100644
index 000000000..e43b37250
--- /dev/null
+++ b/libs/libaom/src/examples/encoder_util.c
@@ -0,0 +1,136 @@
+/*
+ * Copyright (c) 2017, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+// Utility functions used by encoder binaries.
+
+#include "examples/encoder_util.h"
+
+#include <assert.h>
+#include <string.h>
+
+#include "aom/aom_integer.h"
+
+#define mmin(a, b) ((a) < (b) ? (a) : (b))
+
+static void find_mismatch_plane(const aom_image_t *const img1,
+                                const aom_image_t *const img2, int plane,
+                                int use_highbitdepth, int loc[4]) {
+  const unsigned char *const p1 = img1->planes[plane];
+  const int p1_stride = img1->stride[plane] >> use_highbitdepth;
+  const unsigned char *const p2 = img2->planes[plane];
+  const int p2_stride = img2->stride[plane] >> use_highbitdepth;
+  const uint32_t bsize = 64;
+  const int is_y_plane = (plane == AOM_PLANE_Y);
+  const uint32_t bsizex = is_y_plane ? bsize : bsize >> img1->x_chroma_shift;
+  const uint32_t bsizey = is_y_plane ? bsize : bsize >> img1->y_chroma_shift;
+  const uint32_t c_w =
+      is_y_plane ? img1->d_w
+                 : (img1->d_w + img1->x_chroma_shift) >> img1->x_chroma_shift;
+  const uint32_t c_h =
+      is_y_plane ? img1->d_h
+                 : (img1->d_h + img1->y_chroma_shift) >> img1->y_chroma_shift;
+  assert(img1->d_w == img2->d_w && img1->d_h == img2->d_h);
+  assert(img1->x_chroma_shift == img2->x_chroma_shift &&
+         img1->y_chroma_shift == img2->y_chroma_shift);
+  loc[0] = loc[1] = loc[2] = loc[3] = -1;
+  if (img1->monochrome && img2->monochrome && plane) return;
+  int match = 1;
+  uint32_t i, j;
+  for (i = 0; match && i < c_h; i += bsizey) {
+    for (j = 0; match && j < c_w; j += bsizex) {
+      const int si =
+          is_y_plane ? mmin(i + bsizey, c_h) - i : mmin(i + bsizey, c_h - i);
+      const int sj =
+          is_y_plane ? mmin(j + bsizex, c_w) - j : mmin(j + bsizex, c_w - j);
+      int k, l;
+      for (k = 0; match && k < si; ++k) {
+        for (l = 0; match && l < sj; ++l) {
+          const int row = i + k;
+          const int col = j + l;
+          const int offset1 = row * p1_stride + col;
+          const int offset2 = row * p2_stride + col;
+          const int val1 = use_highbitdepth
+                               ? p1[2 * offset1] | (p1[2 * offset1 + 1] << 8)
+                               : p1[offset1];
+          const int val2 = use_highbitdepth
+                               ? p2[2 * offset2] | (p2[2 * offset2 + 1] << 8)
+                               : p2[offset2];
+          if (val1 != val2) {
+            loc[0] = row;
+            loc[1] = col;
+            loc[2] = val1;
+            loc[3] = val2;
+            match = 0;
+            break;
+          }
+        }
+      }
+    }
+  }
+}
+
+static void find_mismatch_helper(const aom_image_t *const img1,
+                                 const aom_image_t *const img2,
+                                 int use_highbitdepth, int yloc[4], int uloc[4],
+                                 int vloc[4]) {
+  find_mismatch_plane(img1, img2, AOM_PLANE_Y, use_highbitdepth, yloc);
+  find_mismatch_plane(img1, img2, AOM_PLANE_U, use_highbitdepth, uloc);
+  find_mismatch_plane(img1, img2, AOM_PLANE_V, use_highbitdepth, vloc);
+}
+
+void aom_find_mismatch_high(const aom_image_t *const img1,
+                            const aom_image_t *const img2, int yloc[4],
+                            int uloc[4], int vloc[4]) {
+  find_mismatch_helper(img1, img2, 1, yloc, uloc, vloc);
+}
+
+void aom_find_mismatch(const aom_image_t *const img1,
+                       const aom_image_t *const img2, int yloc[4], int uloc[4],
+                       int vloc[4]) {
+  find_mismatch_helper(img1, img2, 0, yloc, uloc, vloc);
+}
+
+int aom_compare_img(const aom_image_t *const img1,
+                    const aom_image_t *const img2) {
+  assert(img1->cp == img2->cp);
+  assert(img1->tc == img2->tc);
+  assert(img1->mc == img2->mc);
+  assert(img1->monochrome == img2->monochrome);
+
+  int num_planes = img1->monochrome ? 1 : 3;
+
+  uint32_t l_w = img1->d_w;
+  uint32_t c_w = (img1->d_w + img1->x_chroma_shift) >> img1->x_chroma_shift;
+  const uint32_t c_h =
+      (img1->d_h + img1->y_chroma_shift) >> img1->y_chroma_shift;
+  int match = 1;
+
+  match &= (img1->fmt == img2->fmt);
+  match &= (img1->d_w == img2->d_w);
+  match &= (img1->d_h == img2->d_h);
+  if (img1->fmt & AOM_IMG_FMT_HIGHBITDEPTH) {
+    l_w *= 2;
+    c_w *= 2;
+  }
+
+  for (int plane = 0; plane < num_planes; ++plane) {
+    uint32_t height = plane ? c_h : img1->d_h;
+    uint32_t width = plane ? c_w : l_w;
+
+    for (uint32_t i = 0; i < height; ++i) {
+      match &=
+          (memcmp(img1->planes[plane] + i * img1->stride[plane],
+                  img2->planes[plane] + i * img2->stride[plane], width) == 0);
+    }
+  }
+
+  return match;
+}
diff --git a/libs/libaom/src/examples/encoder_util.h b/libs/libaom/src/examples/encoder_util.h
new file mode 100644
index 000000000..a6bb3fb48
--- /dev/null
+++ b/libs/libaom/src/examples/encoder_util.h
@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2017, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+// Utility functions used by encoder binaries.
+
+#ifndef AOM_EXAMPLES_ENCODER_UTIL_H_
+#define AOM_EXAMPLES_ENCODER_UTIL_H_
+
+#include "aom/aom_image.h"
+
+// Returns mismatch location (?loc[0],?loc[1]) and the values at that location
+// in img1 (?loc[2]) and img2 (?loc[3]).
+void aom_find_mismatch_high(const aom_image_t *const img1,
+                            const aom_image_t *const img2, int yloc[4],
+                            int uloc[4], int vloc[4]);
+
+void aom_find_mismatch(const aom_image_t *const img1,
+                       const aom_image_t *const img2, int yloc[4], int uloc[4],
+                       int vloc[4]);
+
+// Returns 1 if the two images match.
+int aom_compare_img(const aom_image_t *const img1,
+                    const aom_image_t *const img2);
+
+#endif  // AOM_EXAMPLES_ENCODER_UTIL_H_
diff --git a/libs/libaom/src/examples/inspect.c b/libs/libaom/src/examples/inspect.c
new file mode 100644
index 000000000..526bdc16c
--- /dev/null
+++ b/libs/libaom/src/examples/inspect.c
@@ -0,0 +1,958 @@
+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+// Inspect Decoder
+// ================
+//
+// This is a simple decoder loop that writes JSON stats to stdout. This tool
+// can also be compiled with Emscripten and used as a library.
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#ifdef __EMSCRIPTEN__
+#include <emscripten.h>
+#else
+#define EMSCRIPTEN_KEEPALIVE
+#endif
+
+#include "config/aom_config.h"
+
+#include "aom/aom_decoder.h"
+#include "aom/aomdx.h"
+#include "av1/common/av1_common_int.h"
+
+#if CONFIG_ACCOUNTING
+#include "av1/decoder/accounting.h"
+#endif
+
+#include "av1/decoder/inspection.h"
+#include "common/args.h"
+#include "common/tools_common.h"
+#include "common/video_common.h"
+#include "common/video_reader.h"
+
+// Max JSON buffer size.
+const int MAX_BUFFER = 1024 * 1024 * 256;
+
+typedef enum {
+  ACCOUNTING_LAYER = 1,
+  BLOCK_SIZE_LAYER = 1 << 1,
+  TRANSFORM_SIZE_LAYER = 1 << 2,
+  TRANSFORM_TYPE_LAYER = 1 << 3,
+  MODE_LAYER = 1 << 4,
+  SKIP_LAYER = 1 << 5,
+  FILTER_LAYER = 1 << 6,
+  CDEF_LAYER = 1 << 7,
+  REFERENCE_FRAME_LAYER = 1 << 8,
+  MOTION_VECTORS_LAYER = 1 << 9,
+  UV_MODE_LAYER = 1 << 10,
+  CFL_LAYER = 1 << 11,
+  DUAL_FILTER_LAYER = 1 << 12,
+  Q_INDEX_LAYER = 1 << 13,
+  SEGMENT_ID_LAYER = 1 << 14,
+  MOTION_MODE_LAYER = 1 << 15,
+  COMPOUND_TYPE_LAYER = 1 << 16,
+  INTRABC_LAYER = 1 << 17,
+  PALETTE_LAYER = 1 << 18,
+  UV_PALETTE_LAYER = 1 << 19,
+  ALL_LAYERS = (1 << 20) - 1
+} LayerType;
+
+static LayerType layers = 0;
+
+static int stop_after = 0;
+static int compress = 0;
+
+static const arg_def_t limit_arg =
+    ARG_DEF(NULL, "limit", 1, "Stop decoding after n frames");
+static const arg_def_t dump_all_arg = ARG_DEF("A", "all", 0, "Dump All");
+static const arg_def_t compress_arg =
+    ARG_DEF("x", "compress", 0, "Compress JSON using RLE");
+static const arg_def_t dump_accounting_arg =
+    ARG_DEF("a", "accounting", 0, "Dump Accounting");
+static const arg_def_t dump_block_size_arg =
+    ARG_DEF("bs", "blockSize", 0, "Dump Block Size");
+static const arg_def_t dump_motion_vectors_arg =
+    ARG_DEF("mv", "motionVectors", 0, "Dump Motion Vectors");
+static const arg_def_t dump_transform_size_arg =
+    ARG_DEF("ts", "transformSize", 0, "Dump Transform Size");
+static const arg_def_t dump_transform_type_arg =
+    ARG_DEF("tt", "transformType", 0, "Dump Transform Type");
+static const arg_def_t dump_mode_arg = ARG_DEF("m", "mode", 0, "Dump Mode");
+static const arg_def_t dump_motion_mode_arg =
+    ARG_DEF("mm", "motion_mode", 0, "Dump Motion Modes");
+static const arg_def_t dump_compound_type_arg =
+    ARG_DEF("ct", "compound_type", 0, "Dump Compound Types");
+static const arg_def_t dump_uv_mode_arg =
+    ARG_DEF("uvm", "uv_mode", 0, "Dump UV Intra Prediction Modes");
+static const arg_def_t dump_skip_arg = ARG_DEF("s", "skip", 0, "Dump Skip");
+static const arg_def_t dump_filter_arg =
+    ARG_DEF("f", "filter", 0, "Dump Filter");
+static const arg_def_t dump_cdef_arg = ARG_DEF("c", "cdef", 0, "Dump CDEF");
+static const arg_def_t dump_cfl_arg =
+    ARG_DEF("cfl", "chroma_from_luma", 0, "Dump Chroma from Luma Alphas");
+static const arg_def_t dump_dual_filter_type_arg =
+    ARG_DEF("df", "dualFilterType", 0, "Dump Dual Filter Type");
+static const arg_def_t dump_reference_frame_arg =
+    ARG_DEF("r", "referenceFrame", 0, "Dump Reference Frame");
+static const arg_def_t dump_delta_q_arg =
+    ARG_DEF("dq", "delta_q", 0, "Dump QIndex");
+static const arg_def_t dump_seg_id_arg =
+    ARG_DEF("si", "seg_id", 0, "Dump Segment ID");
+static const arg_def_t dump_intrabc_arg =
+    ARG_DEF("ibc", "intrabc", 0, "Dump If IntraBC Is Used");
+static const arg_def_t dump_palette_arg =
+    ARG_DEF("plt", "palette", 0, "Dump Palette Size");
+static const arg_def_t dump_uv_palette_arg =
+    ARG_DEF("uvp", "uv_palette", 0, "Dump UV Palette Size");
+static const arg_def_t usage_arg = ARG_DEF("h", "help", 0, "Help");
+static const arg_def_t skip_non_transform_arg = ARG_DEF(
+    "snt", "skip_non_transform", 1, "Skip is counted as a non transform.");
+static const arg_def_t combined_arg =
+    ARG_DEF("comb", "combined", 1, "combinining parameters into one output.");
+
+int combined_parm_list[15];
+int combined_parm_count = 0;
+
+static const arg_def_t *main_args[] = { &limit_arg,
+                                        &dump_all_arg,
+                                        &compress_arg,
+#if CONFIG_ACCOUNTING
+                                        &dump_accounting_arg,
+#endif
+                                        &dump_block_size_arg,
+                                        &dump_transform_size_arg,
+                                        &dump_transform_type_arg,
+                                        &dump_mode_arg,
+                                        &dump_uv_mode_arg,
+                                        &dump_motion_mode_arg,
+                                        &dump_compound_type_arg,
+                                        &dump_skip_arg,
+                                        &dump_filter_arg,
+                                        &dump_cdef_arg,
+                                        &dump_dual_filter_type_arg,
+                                        &dump_cfl_arg,
+                                        &dump_reference_frame_arg,
+                                        &dump_motion_vectors_arg,
+                                        &dump_delta_q_arg,
+                                        &dump_seg_id_arg,
+                                        &dump_intrabc_arg,
+                                        &dump_palette_arg,
+                                        &dump_uv_palette_arg,
+                                        &usage_arg,
+                                        &skip_non_transform_arg,
+                                        &combined_arg,
+                                        NULL };
+#define ENUM(name) \
+  { #name, name }
+#define LAST_ENUM \
+  { NULL, 0 }
+typedef struct map_entry {
+  const char *name;
+  int value;
+} map_entry;
+
+const map_entry refs_map[] = {
+  ENUM(INTRA_FRAME),   ENUM(LAST_FRAME),   ENUM(LAST2_FRAME),
+  ENUM(LAST3_FRAME),   ENUM(GOLDEN_FRAME), ENUM(BWDREF_FRAME),
+  ENUM(ALTREF2_FRAME), ENUM(ALTREF_FRAME), LAST_ENUM
+};
+
+const map_entry block_size_map[] = {
+  ENUM(BLOCK_4X4),     ENUM(BLOCK_4X8),    ENUM(BLOCK_8X4),
+  ENUM(BLOCK_8X8),     ENUM(BLOCK_8X16),   ENUM(BLOCK_16X8),
+  ENUM(BLOCK_16X16),   ENUM(BLOCK_16X32),  ENUM(BLOCK_32X16),
+  ENUM(BLOCK_32X32),   ENUM(BLOCK_32X64),  ENUM(BLOCK_64X32),
+  ENUM(BLOCK_64X64),   ENUM(BLOCK_64X128), ENUM(BLOCK_128X64),
+  ENUM(BLOCK_128X128), ENUM(BLOCK_4X16),   ENUM(BLOCK_16X4),
+  ENUM(BLOCK_8X32),    ENUM(BLOCK_32X8),   ENUM(BLOCK_16X64),
+  ENUM(BLOCK_64X16),   LAST_ENUM
+};
+
+#define TX_SKIP -1
+
+const map_entry tx_size_map[] = {
+  ENUM(TX_4X4),   ENUM(TX_8X8),   ENUM(TX_16X16), ENUM(TX_32X32),
+  ENUM(TX_64X64), ENUM(TX_4X8),   ENUM(TX_8X4),   ENUM(TX_8X16),
+  ENUM(TX_16X8),  ENUM(TX_16X32), ENUM(TX_32X16), ENUM(TX_32X64),
+  ENUM(TX_64X32), ENUM(TX_4X16),  ENUM(TX_16X4),  ENUM(TX_8X32),
+  ENUM(TX_32X8),  ENUM(TX_16X64), ENUM(TX_64X16), LAST_ENUM
+};
+
+const map_entry tx_type_map[] = { ENUM(DCT_DCT),
+                                  ENUM(ADST_DCT),
+                                  ENUM(DCT_ADST),
+                                  ENUM(ADST_ADST),
+                                  ENUM(FLIPADST_DCT),
+                                  ENUM(DCT_FLIPADST),
+                                  ENUM(FLIPADST_FLIPADST),
+                                  ENUM(ADST_FLIPADST),
+                                  ENUM(FLIPADST_ADST),
+                                  ENUM(IDTX),
+                                  ENUM(V_DCT),
+                                  ENUM(H_DCT),
+                                  ENUM(V_ADST),
+                                  ENUM(H_ADST),
+                                  ENUM(V_FLIPADST),
+                                  ENUM(H_FLIPADST),
+                                  LAST_ENUM };
+const map_entry dual_filter_map[] = { ENUM(REG_REG),       ENUM(REG_SMOOTH),
+                                      ENUM(REG_SHARP),     ENUM(SMOOTH_REG),
+                                      ENUM(SMOOTH_SMOOTH), ENUM(SMOOTH_SHARP),
+                                      ENUM(SHARP_REG),     ENUM(SHARP_SMOOTH),
+                                      ENUM(SHARP_SHARP),   LAST_ENUM };
+
+const map_entry prediction_mode_map[] = {
+  ENUM(DC_PRED),     ENUM(V_PRED),        ENUM(H_PRED),
+  ENUM(D45_PRED),    ENUM(D135_PRED),     ENUM(D113_PRED),
+  ENUM(D157_PRED),   ENUM(D203_PRED),     ENUM(D67_PRED),
+  ENUM(SMOOTH_PRED), ENUM(SMOOTH_V_PRED), ENUM(SMOOTH_H_PRED),
+  ENUM(PAETH_PRED),  ENUM(NEARESTMV),     ENUM(NEARMV),
+  ENUM(GLOBALMV),    ENUM(NEWMV),         ENUM(NEAREST_NEARESTMV),
+  ENUM(NEAR_NEARMV), ENUM(NEAREST_NEWMV), ENUM(NEW_NEARESTMV),
+  ENUM(NEAR_NEWMV),  ENUM(NEW_NEARMV),    ENUM(GLOBAL_GLOBALMV),
+  ENUM(NEW_NEWMV),   ENUM(INTRA_INVALID), LAST_ENUM
+};
+
+const map_entry motion_mode_map[] = { ENUM(SIMPLE_TRANSLATION),
+                                      ENUM(OBMC_CAUSAL),    // 2-sided OBMC
+                                      ENUM(WARPED_CAUSAL),  // 2-sided WARPED
+                                      LAST_ENUM };
+
+const map_entry compound_type_map[] = { ENUM(COMPOUND_AVERAGE),
+                                        ENUM(COMPOUND_WEDGE),
+                                        ENUM(COMPOUND_DIFFWTD), LAST_ENUM };
+
+const map_entry uv_prediction_mode_map[] = {
+  ENUM(UV_DC_PRED),       ENUM(UV_V_PRED),
+  ENUM(UV_H_PRED),        ENUM(UV_D45_PRED),
+  ENUM(UV_D135_PRED),     ENUM(UV_D113_PRED),
+  ENUM(UV_D157_PRED),     ENUM(UV_D203_PRED),
+  ENUM(UV_D67_PRED),      ENUM(UV_SMOOTH_PRED),
+  ENUM(UV_SMOOTH_V_PRED), ENUM(UV_SMOOTH_H_PRED),
+  ENUM(UV_PAETH_PRED),    ENUM(UV_CFL_PRED),
+  ENUM(UV_MODE_INVALID),  LAST_ENUM
+};
+#define NO_SKIP 0
+#define SKIP 1
+
+const map_entry skip_map[] = { ENUM(SKIP), ENUM(NO_SKIP), LAST_ENUM };
+
+const map_entry intrabc_map[] = { { "INTRABC", 1 },
+                                  { "NO_INTRABC", 0 },
+                                  LAST_ENUM };
+
+const map_entry palette_map[] = {
+  { "ZERO_COLORS", 0 },  { "TWO_COLORS", 2 },   { "THREE_COLORS", 3 },
+  { "FOUR_COLORS", 4 },  { "FIVE_COLORS", 5 },  { "SIX_COLORS", 6 },
+  { "SEVEN_COLORS", 7 }, { "EIGHT_COLORS", 8 }, LAST_ENUM
+};
+
+const map_entry config_map[] = { ENUM(MI_SIZE), LAST_ENUM };
+
+static const char *exec_name;
+
+struct parm_offset {
+  char parm[60];
+  char offset;
+};
+struct parm_offset parm_offsets[] = {
+  { "blockSize", offsetof(insp_mi_data, sb_type) },
+  { "transformSize", offsetof(insp_mi_data, tx_size) },
+  { "transformType", offsetof(insp_mi_data, tx_type) },
+  { "dualFilterType", offsetof(insp_mi_data, dual_filter_type) },
+  { "mode", offsetof(insp_mi_data, mode) },
+  { "uv_mode", offsetof(insp_mi_data, uv_mode) },
+  { "motion_mode", offsetof(insp_mi_data, motion_mode) },
+  { "compound_type", offsetof(insp_mi_data, compound_type) },
+  { "referenceFrame", offsetof(insp_mi_data, ref_frame) },
+  { "skip", offsetof(insp_mi_data, skip) },
+};
+int parm_count = sizeof(parm_offsets) / sizeof(parm_offsets[0]);
+
+int convert_to_indices(char *str, int *indices, int maxCount, int *count) {
+  *count = 0;
+  do {
+    char *comma = strchr(str, ',');
+    int length = (comma ? (int)(comma - str) : (int)strlen(str));
+    int i;
+    for (i = 0; i < parm_count; ++i) {
+      if (!strncmp(str, parm_offsets[i].parm, length)) {
+        break;
+      }
+    }
+    if (i == parm_count) return 0;
+    indices[(*count)++] = i;
+    if (*count > maxCount) return 0;
+    str += length + 1;
+  } while (strlen(str) > 0);
+  return 1;
+}
+
+insp_frame_data frame_data;
+int frame_count = 0;
+int decoded_frame_count = 0;
+aom_codec_ctx_t codec;
+AvxVideoReader *reader = NULL;
+const AvxVideoInfo *info = NULL;
+aom_image_t *img = NULL;
+
+void on_frame_decoded_dump(char *json) {
+#ifdef __EMSCRIPTEN__
+  EM_ASM_({ Module.on_frame_decoded_json($0); }, json);
+#else
+  printf("%s", json);
+#endif
+}
+
+// Writing out the JSON buffer using snprintf is very slow, especially when
+// compiled with emscripten, these functions speed things up quite a bit.
+int put_str(char *buffer, const char *str) {
+  int i;
+  for (i = 0; str[i] != '\0'; i++) {
+    buffer[i] = str[i];
+  }
+  return i;
+}
+
+int put_str_with_escape(char *buffer, const char *str) {
+  int i;
+  int j = 0;
+  for (i = 0; str[i] != '\0'; i++) {
+    if (str[i] < ' ') {
+      continue;
+    } else if (str[i] == '"' || str[i] == '\\') {
+      buffer[j++] = '\\';
+    }
+    buffer[j++] = str[i];
+  }
+  return j;
+}
+
+int put_num(char *buffer, char prefix, int num, char suffix) {
+  int i = 0;
+  char *buf = buffer;
+  int is_neg = 0;
+  if (prefix) {
+    buf[i++] = prefix;
+  }
+  if (num == 0) {
+    buf[i++] = '0';
+  } else {
+    if (num < 0) {
+      num = -num;
+      is_neg = 1;
+    }
+    int s = i;
+    while (num != 0) {
+      buf[i++] = '0' + (num % 10);
+      num = num / 10;
+    }
+    if (is_neg) {
+      buf[i++] = '-';
+    }
+    int e = i - 1;
+    while (s < e) {
+      int t = buf[s];
+      buf[s] = buf[e];
+      buf[e] = t;
+      s++;
+      e--;
+    }
+  }
+  if (suffix) {
+    buf[i++] = suffix;
+  }
+  return i;
+}
+
+int put_map(char *buffer, const map_entry *map) {
+  char *buf = buffer;
+  const map_entry *entry = map;
+  while (entry->name != NULL) {
+    *(buf++) = '"';
+    buf += put_str(buf, entry->name);
+    *(buf++) = '"';
+    buf += put_num(buf, ':', entry->value, 0);
+    entry++;
+    if (entry->name != NULL) {
+      *(buf++) = ',';
+    }
+  }
+  return (int)(buf - buffer);
+}
+
+int put_reference_frame(char *buffer) {
+  const int mi_rows = frame_data.mi_rows;
+  const int mi_cols = frame_data.mi_cols;
+  char *buf = buffer;
+  int r, c, t;
+  buf += put_str(buf, "  \"referenceFrameMap\": {");
+  buf += put_map(buf, refs_map);
+  buf += put_str(buf, "},\n");
+  buf += put_str(buf, "  \"referenceFrame\": [");
+  for (r = 0; r < mi_rows; ++r) {
+    *(buf++) = '[';
+    for (c = 0; c < mi_cols; ++c) {
+      insp_mi_data *mi = &frame_data.mi_grid[r * mi_cols + c];
+      buf += put_num(buf, '[', mi->ref_frame[0], 0);
+      buf += put_num(buf, ',', mi->ref_frame[1], ']');
+      if (compress) {  // RLE
+        for (t = c + 1; t < mi_cols; ++t) {
+          insp_mi_data *next_mi = &frame_data.mi_grid[r * mi_cols + t];
+          if (mi->ref_frame[0] != next_mi->ref_frame[0] ||
+              mi->ref_frame[1] != next_mi->ref_frame[1]) {
+            break;
+          }
+        }
+        if (t - c > 1) {
+          *(buf++) = ',';
+          buf += put_num(buf, '[', t - c - 1, ']');
+          c = t - 1;
+        }
+      }
+      if (c < mi_cols - 1) *(buf++) = ',';
+    }
+    *(buf++) = ']';
+    if (r < mi_rows - 1) *(buf++) = ',';
+  }
+  buf += put_str(buf, "],\n");
+  return (int)(buf - buffer);
+}
+
+int put_motion_vectors(char *buffer) {
+  const int mi_rows = frame_data.mi_rows;
+  const int mi_cols = frame_data.mi_cols;
+  char *buf = buffer;
+  int r, c, t;
+  buf += put_str(buf, "  \"motionVectors\": [");
+  for (r = 0; r < mi_rows; ++r) {
+    *(buf++) = '[';
+    for (c = 0; c < mi_cols; ++c) {
+      insp_mi_data *mi = &frame_data.mi_grid[r * mi_cols + c];
+      buf += put_num(buf, '[', mi->mv[0].col, 0);
+      buf += put_num(buf, ',', mi->mv[0].row, 0);
+      buf += put_num(buf, ',', mi->mv[1].col, 0);
+      buf += put_num(buf, ',', mi->mv[1].row, ']');
+      if (compress) {  // RLE
+        for (t = c + 1; t < mi_cols; ++t) {
+          insp_mi_data *next_mi = &frame_data.mi_grid[r * mi_cols + t];
+          if (mi->mv[0].col != next_mi->mv[0].col ||
+              mi->mv[0].row != next_mi->mv[0].row ||
+              mi->mv[1].col != next_mi->mv[1].col ||
+              mi->mv[1].row != next_mi->mv[1].row) {
+            break;
+          }
+        }
+        if (t - c > 1) {
+          *(buf++) = ',';
+          buf += put_num(buf, '[', t - c - 1, ']');
+          c = t - 1;
+        }
+      }
+      if (c < mi_cols - 1) *(buf++) = ',';
+    }
+    *(buf++) = ']';
+    if (r < mi_rows - 1) *(buf++) = ',';
+  }
+  buf += put_str(buf, "],\n");
+  return (int)(buf - buffer);
+}
+
+int put_combined(char *buffer) {
+  const int mi_rows = frame_data.mi_rows;
+  const int mi_cols = frame_data.mi_cols;
+  char *buf = buffer;
+  int r, c, p;
+  buf += put_str(buf, "  \"");
+  for (p = 0; p < combined_parm_count; ++p) {
+    if (p) buf += put_str(buf, "&");
+    buf += put_str(buf, parm_offsets[combined_parm_list[p]].parm);
+  }
+  buf += put_str(buf, "\": [");
+  for (r = 0; r < mi_rows; ++r) {
+    *(buf++) = '[';
+    for (c = 0; c < mi_cols; ++c) {
+      insp_mi_data *mi = &frame_data.mi_grid[r * mi_cols + c];
+      *(buf++) = '[';
+      for (p = 0; p < combined_parm_count; ++p) {
+        if (p) *(buf++) = ',';
+        int16_t *v = (int16_t *)(((int8_t *)mi) +
+                                 parm_offsets[combined_parm_list[p]].offset);
+        buf += put_num(buf, 0, v[0], 0);
+      }
+      *(buf++) = ']';
+      if (c < mi_cols - 1) *(buf++) = ',';
+    }
+    *(buf++) = ']';
+    if (r < mi_rows - 1) *(buf++) = ',';
+  }
+  buf += put_str(buf, "],\n");
+  return (int)(buf - buffer);
+}
+
+int put_block_info(char *buffer, const map_entry *map, const char *name,
+                   size_t offset, int len) {
+  const int mi_rows = frame_data.mi_rows;
+  const int mi_cols = frame_data.mi_cols;
+  char *buf = buffer;
+  int r, c, t, i;
+  if (compress && len == 1) {
+    die("Can't encode scalars as arrays when RLE compression is enabled.");
+    return -1;
+  }
+  if (map) {
+    buf += snprintf(buf, MAX_BUFFER, "  \"%sMap\": {", name);
+    buf += put_map(buf, map);
+    buf += put_str(buf, "},\n");
+  }
+  buf += snprintf(buf, MAX_BUFFER, "  \"%s\": [", name);
+  for (r = 0; r < mi_rows; ++r) {
+    *(buf++) = '[';
+    for (c = 0; c < mi_cols; ++c) {
+      insp_mi_data *mi = &frame_data.mi_grid[r * mi_cols + c];
+      int16_t *v = (int16_t *)(((int8_t *)mi) + offset);
+      if (len == 0) {
+        buf += put_num(buf, 0, v[0], 0);
+      } else {
+        buf += put_str(buf, "[");
+        for (i = 0; i < len; i++) {
+          buf += put_num(buf, 0, v[i], 0);
+          if (i < len - 1) {
+            buf += put_str(buf, ",");
+          }
+        }
+        buf += put_str(buf, "]");
+      }
+      if (compress) {  // RLE
+        for (t = c + 1; t < mi_cols; ++t) {
+          insp_mi_data *next_mi = &frame_data.mi_grid[r * mi_cols + t];
+          int16_t *nv = (int16_t *)(((int8_t *)next_mi) + offset);
+          int same = 0;
+          if (len == 0) {
+            same = v[0] == nv[0];
+          } else {
+            for (i = 0; i < len; i++) {
+              same = v[i] == nv[i];
+              if (!same) {
+                break;
+              }
+            }
+          }
+          if (!same) {
+            break;
+          }
+        }
+        if (t - c > 1) {
+          *(buf++) = ',';
+          buf += put_num(buf, '[', t - c - 1, ']');
+          c = t - 1;
+        }
+      }
+      if (c < mi_cols - 1) *(buf++) = ',';
+    }
+    *(buf++) = ']';
+    if (r < mi_rows - 1) *(buf++) = ',';
+  }
+  buf += put_str(buf, "],\n");
+  return (int)(buf - buffer);
+}
+
+#if CONFIG_ACCOUNTING
+int put_accounting(char *buffer) {
+  char *buf = buffer;
+  int i;
+  const Accounting *accounting = frame_data.accounting;
+  if (accounting == NULL) {
+    printf("XXX\n");
+    return 0;
+  }
+  const int num_syms = accounting->syms.num_syms;
+  const int num_strs = accounting->syms.dictionary.num_strs;
+  buf += put_str(buf, "  \"symbolsMap\": [");
+  for (i = 0; i < num_strs; i++) {
+    buf += snprintf(buf, MAX_BUFFER, "\"%s\"",
+                    accounting->syms.dictionary.strs[i]);
+    if (i < num_strs - 1) *(buf++) = ',';
+  }
+  buf += put_str(buf, "],\n");
+  buf += put_str(buf, "  \"symbols\": [\n    ");
+  AccountingSymbolContext context;
+  context.x = -2;
+  context.y = -2;
+  AccountingSymbol *sym;
+  for (i = 0; i < num_syms; i++) {
+    sym = &accounting->syms.syms[i];
+    if (memcmp(&context, &sym->context, sizeof(AccountingSymbolContext)) != 0) {
+      buf += put_num(buf, '[', sym->context.x, 0);
+      buf += put_num(buf, ',', sym->context.y, ']');
+    } else {
+      buf += put_num(buf, '[', sym->id, 0);
+      buf += put_num(buf, ',', sym->bits, 0);
+      buf += put_num(buf, ',', sym->samples, ']');
+    }
+    context = sym->context;
+    if (i < num_syms - 1) *(buf++) = ',';
+  }
+  buf += put_str(buf, "],\n");
+  return (int)(buf - buffer);
+}
+#endif
+
+int skip_non_transform = 0;
+
+void inspect(void *pbi, void *data) {
+  /* Fetch frame data. */
+  ifd_inspect(&frame_data, pbi, skip_non_transform);
+
+  // Show existing frames just show a reference buffer we've already decoded.
+  // There's no information to show.
+  if (frame_data.show_existing_frame) return;
+
+  (void)data;
+  // We allocate enough space and hope we don't write out of bounds. Totally
+  // unsafe but this speeds things up, especially when compiled to Javascript.
+  char *buffer = aom_malloc(MAX_BUFFER);
+  char *buf = buffer;
+  buf += put_str(buf, "{\n");
+  if (layers & BLOCK_SIZE_LAYER) {
+    buf += put_block_info(buf, block_size_map, "blockSize",
+                          offsetof(insp_mi_data, sb_type), 0);
+  }
+  if (layers & TRANSFORM_SIZE_LAYER) {
+    buf += put_block_info(buf, tx_size_map, "transformSize",
+                          offsetof(insp_mi_data, tx_size), 0);
+  }
+  if (layers & TRANSFORM_TYPE_LAYER) {
+    buf += put_block_info(buf, tx_type_map, "transformType",
+                          offsetof(insp_mi_data, tx_type), 0);
+  }
+  if (layers & DUAL_FILTER_LAYER) {
+    buf += put_block_info(buf, dual_filter_map, "dualFilterType",
+                          offsetof(insp_mi_data, dual_filter_type), 0);
+  }
+  if (layers & MODE_LAYER) {
+    buf += put_block_info(buf, prediction_mode_map, "mode",
+                          offsetof(insp_mi_data, mode), 0);
+  }
+  if (layers & UV_MODE_LAYER) {
+    buf += put_block_info(buf, uv_prediction_mode_map, "uv_mode",
+                          offsetof(insp_mi_data, uv_mode), 0);
+  }
+  if (layers & MOTION_MODE_LAYER) {
+    buf += put_block_info(buf, motion_mode_map, "motion_mode",
+                          offsetof(insp_mi_data, motion_mode), 0);
+  }
+  if (layers & COMPOUND_TYPE_LAYER) {
+    buf += put_block_info(buf, compound_type_map, "compound_type",
+                          offsetof(insp_mi_data, compound_type), 0);
+  }
+  if (layers & SKIP_LAYER) {
+    buf +=
+        put_block_info(buf, skip_map, "skip", offsetof(insp_mi_data, skip), 0);
+  }
+  if (layers & FILTER_LAYER) {
+    buf +=
+        put_block_info(buf, NULL, "filter", offsetof(insp_mi_data, filter), 2);
+  }
+  if (layers & CDEF_LAYER) {
+    buf += put_block_info(buf, NULL, "cdef_level",
+                          offsetof(insp_mi_data, cdef_level), 0);
+    buf += put_block_info(buf, NULL, "cdef_strength",
+                          offsetof(insp_mi_data, cdef_strength), 0);
+  }
+  if (layers & CFL_LAYER) {
+    buf += put_block_info(buf, NULL, "cfl_alpha_idx",
+                          offsetof(insp_mi_data, cfl_alpha_idx), 0);
+    buf += put_block_info(buf, NULL, "cfl_alpha_sign",
+                          offsetof(insp_mi_data, cfl_alpha_sign), 0);
+  }
+  if (layers & Q_INDEX_LAYER) {
+    buf += put_block_info(buf, NULL, "delta_q",
+                          offsetof(insp_mi_data, current_qindex), 0);
+  }
+  if (layers & SEGMENT_ID_LAYER) {
+    buf += put_block_info(buf, NULL, "seg_id",
+                          offsetof(insp_mi_data, segment_id), 0);
+  }
+  if (layers & MOTION_VECTORS_LAYER) {
+    buf += put_motion_vectors(buf);
+  }
+  if (layers & INTRABC_LAYER) {
+    buf += put_block_info(buf, intrabc_map, "intrabc",
+                          offsetof(insp_mi_data, intrabc), 0);
+  }
+  if (layers & PALETTE_LAYER) {
+    buf += put_block_info(buf, palette_map, "palette",
+                          offsetof(insp_mi_data, palette), 0);
+  }
+  if (layers & UV_PALETTE_LAYER) {
+    buf += put_block_info(buf, palette_map, "uv_palette",
+                          offsetof(insp_mi_data, uv_palette), 0);
+  }
+  if (combined_parm_count > 0) buf += put_combined(buf);
+  if (layers & REFERENCE_FRAME_LAYER) {
+    buf += put_block_info(buf, refs_map, "referenceFrame",
+                          offsetof(insp_mi_data, ref_frame), 2);
+  }
+#if CONFIG_ACCOUNTING
+  if (layers & ACCOUNTING_LAYER) {
+    buf += put_accounting(buf);
+  }
+#endif
+  buf +=
+      snprintf(buf, MAX_BUFFER, "  \"frame\": %d,\n", frame_data.frame_number);
+  buf += snprintf(buf, MAX_BUFFER, "  \"showFrame\": %d,\n",
+                  frame_data.show_frame);
+  buf += snprintf(buf, MAX_BUFFER, "  \"frameType\": %d,\n",
+                  frame_data.frame_type);
+  buf += snprintf(buf, MAX_BUFFER, "  \"baseQIndex\": %d,\n",
+                  frame_data.base_qindex);
+  buf += snprintf(buf, MAX_BUFFER, "  \"tileCols\": %d,\n",
+                  frame_data.tile_mi_cols);
+  buf += snprintf(buf, MAX_BUFFER, "  \"tileRows\": %d,\n",
+                  frame_data.tile_mi_rows);
+  buf += snprintf(buf, MAX_BUFFER, "  \"deltaQPresentFlag\": %d,\n",
+                  frame_data.delta_q_present_flag);
+  buf += snprintf(buf, MAX_BUFFER, "  \"deltaQRes\": %d,\n",
+                  frame_data.delta_q_res);
+  buf += put_str(buf, "  \"config\": {");
+  buf += put_map(buf, config_map);
+  buf += put_str(buf, "},\n");
+  buf += put_str(buf, "  \"configString\": \"");
+  buf += put_str_with_escape(buf, aom_codec_build_config());
+  buf += put_str(buf, "\"\n");
+  decoded_frame_count++;
+  buf += put_str(buf, "},\n");
+  *(buf++) = 0;
+  on_frame_decoded_dump(buffer);
+  aom_free(buffer);
+}
+
+void ifd_init_cb() {
+  aom_inspect_init ii;
+  ii.inspect_cb = inspect;
+  ii.inspect_ctx = NULL;
+  aom_codec_control(&codec, AV1_SET_INSPECTION_CALLBACK, &ii);
+}
+
+EMSCRIPTEN_KEEPALIVE
+int open_file(char *file) {
+  if (file == NULL) {
+    // The JS analyzer puts the .ivf file at this location.
+    file = "/tmp/input.ivf";
+  }
+  reader = aom_video_reader_open(file);
+  if (!reader) die("Failed to open %s for reading.", file);
+  info = aom_video_reader_get_info(reader);
+  const AvxInterface *decoder = get_aom_decoder_by_fourcc(info->codec_fourcc);
+  if (!decoder) die("Unknown input codec.");
+  fprintf(stderr, "Using %s\n",
+          aom_codec_iface_name(decoder->codec_interface()));
+  if (aom_codec_dec_init(&codec, decoder->codec_interface(), NULL, 0))
+    die_codec(&codec, "Failed to initialize decoder.");
+  ifd_init(&frame_data, info->frame_width, info->frame_height);
+  ifd_init_cb();
+  return EXIT_SUCCESS;
+}
+
+Av1DecodeReturn adr;
+int have_frame = 0;
+const unsigned char *frame;
+const unsigned char *end_frame;
+size_t frame_size = 0;
+
+EMSCRIPTEN_KEEPALIVE
+int read_frame() {
+  img = NULL;
+
+  // This loop skips over any frames that are show_existing_frames,  as
+  // there is nothing to analyze.
+  do {
+    if (!have_frame) {
+      if (!aom_video_reader_read_frame(reader)) return EXIT_FAILURE;
+      frame = aom_video_reader_get_frame(reader, &frame_size);
+
+      have_frame = 1;
+      end_frame = frame + frame_size;
+    }
+
+    if (aom_codec_decode(&codec, frame, (unsigned int)frame_size, &adr) !=
+        AOM_CODEC_OK) {
+      die_codec(&codec, "Failed to decode frame.");
+    }
+
+    frame = adr.buf;
+    if (frame == end_frame) have_frame = 0;
+  } while (adr.show_existing);
+
+  int got_any_frames = 0;
+  aom_image_t *frame_img;
+  struct av1_ref_frame ref_dec;
+  ref_dec.idx = adr.idx;
+
+  // ref_dec.idx is the index to the reference buffer idx to AV1_GET_REFERENCE
+  // if its -1 the decoder didn't update any reference buffer and the only
+  // way to see the frame is aom_codec_get_frame.
+  if (ref_dec.idx == -1) {
+    aom_codec_iter_t iter = NULL;
+    img = frame_img = aom_codec_get_frame(&codec, &iter);
+    ++frame_count;
+    got_any_frames = 1;
+  } else if (!aom_codec_control(&codec, AV1_GET_REFERENCE, &ref_dec)) {
+    img = frame_img = &ref_dec.img;
+    ++frame_count;
+    got_any_frames = 1;
+  }
+  if (!got_any_frames) {
+    return EXIT_FAILURE;
+  }
+  return EXIT_SUCCESS;
+}
+
+EMSCRIPTEN_KEEPALIVE
+const char *get_aom_codec_build_config() { return aom_codec_build_config(); }
+
+EMSCRIPTEN_KEEPALIVE
+int get_bit_depth() { return img->bit_depth; }
+
+EMSCRIPTEN_KEEPALIVE
+int get_bits_per_sample() { return img->bps; }
+
+EMSCRIPTEN_KEEPALIVE
+int get_image_format() { return img->fmt; }
+
+EMSCRIPTEN_KEEPALIVE
+unsigned char *get_plane(int plane) { return img->planes[plane]; }
+
+EMSCRIPTEN_KEEPALIVE
+int get_plane_stride(int plane) { return img->stride[plane]; }
+
+EMSCRIPTEN_KEEPALIVE
+int get_plane_width(int plane) { return aom_img_plane_width(img, plane); }
+
+EMSCRIPTEN_KEEPALIVE
+int get_plane_height(int plane) { return aom_img_plane_height(img, plane); }
+
+EMSCRIPTEN_KEEPALIVE
+int get_frame_width() { return info->frame_width; }
+
+EMSCRIPTEN_KEEPALIVE
+int get_frame_height() { return info->frame_height; }
+
+static void parse_args(char **argv) {
+  char **argi, **argj;
+  struct arg arg;
+  (void)dump_accounting_arg;
+  (void)dump_cdef_arg;
+  for (argi = argj = argv; (*argj = *argi); argi += arg.argv_step) {
+    arg.argv_step = 1;
+    if (arg_match(&arg, &dump_block_size_arg, argi)) layers |= BLOCK_SIZE_LAYER;
+#if CONFIG_ACCOUNTING
+    else if (arg_match(&arg, &dump_accounting_arg, argi))
+      layers |= ACCOUNTING_LAYER;
+#endif
+    else if (arg_match(&arg, &dump_transform_size_arg, argi))
+      layers |= TRANSFORM_SIZE_LAYER;
+    else if (arg_match(&arg, &dump_transform_type_arg, argi))
+      layers |= TRANSFORM_TYPE_LAYER;
+    else if (arg_match(&arg, &dump_mode_arg, argi))
+      layers |= MODE_LAYER;
+    else if (arg_match(&arg, &dump_uv_mode_arg, argi))
+      layers |= UV_MODE_LAYER;
+    else if (arg_match(&arg, &dump_motion_mode_arg, argi))
+      layers |= MOTION_MODE_LAYER;
+    else if (arg_match(&arg, &dump_compound_type_arg, argi))
+      layers |= COMPOUND_TYPE_LAYER;
+    else if (arg_match(&arg, &dump_skip_arg, argi))
+      layers |= SKIP_LAYER;
+    else if (arg_match(&arg, &dump_filter_arg, argi))
+      layers |= FILTER_LAYER;
+    else if (arg_match(&arg, &dump_cdef_arg, argi))
+      layers |= CDEF_LAYER;
+    else if (arg_match(&arg, &dump_cfl_arg, argi))
+      layers |= CFL_LAYER;
+    else if (arg_match(&arg, &dump_reference_frame_arg, argi))
+      layers |= REFERENCE_FRAME_LAYER;
+    else if (arg_match(&arg, &dump_motion_vectors_arg, argi))
+      layers |= MOTION_VECTORS_LAYER;
+    else if (arg_match(&arg, &dump_dual_filter_type_arg, argi))
+      layers |= DUAL_FILTER_LAYER;
+    else if (arg_match(&arg, &dump_delta_q_arg, argi))
+      layers |= Q_INDEX_LAYER;
+    else if (arg_match(&arg, &dump_seg_id_arg, argi))
+      layers |= SEGMENT_ID_LAYER;
+    else if (arg_match(&arg, &dump_intrabc_arg, argi))
+      layers |= INTRABC_LAYER;
+    else if (arg_match(&arg, &dump_palette_arg, argi))
+      layers |= PALETTE_LAYER;
+    else if (arg_match(&arg, &dump_uv_palette_arg, argi))
+      layers |= UV_PALETTE_LAYER;
+    else if (arg_match(&arg, &dump_all_arg, argi))
+      layers |= ALL_LAYERS;
+    else if (arg_match(&arg, &compress_arg, argi))
+      compress = 1;
+    else if (arg_match(&arg, &usage_arg, argi))
+      usage_exit();
+    else if (arg_match(&arg, &limit_arg, argi))
+      stop_after = arg_parse_uint(&arg);
+    else if (arg_match(&arg, &skip_non_transform_arg, argi))
+      skip_non_transform = arg_parse_uint(&arg);
+    else if (arg_match(&arg, &combined_arg, argi))
+      convert_to_indices(
+          (char *)arg.val, combined_parm_list,
+          sizeof(combined_parm_list) / sizeof(combined_parm_list[0]),
+          &combined_parm_count);
+    else
+      argj++;
+  }
+}
+
+static const char *exec_name;
+
+void usage_exit(void) {
+  fprintf(stderr, "Usage: %s src_filename <options>\n", exec_name);
+  fprintf(stderr, "\nOptions:\n");
+  arg_show_usage(stderr, main_args);
+  exit(EXIT_FAILURE);
+}
+
+EMSCRIPTEN_KEEPALIVE
+int main(int argc, char **argv) {
+  exec_name = argv[0];
+  parse_args(argv);
+  if (argc >= 2) {
+    open_file(argv[1]);
+    printf("[\n");
+    while (1) {
+      if (stop_after && (decoded_frame_count >= stop_after)) break;
+      if (read_frame()) break;
+    }
+    printf("null\n");
+    printf("]");
+  } else {
+    usage_exit();
+  }
+}
+
+EMSCRIPTEN_KEEPALIVE
+void quit() {
+  if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec");
+  aom_video_reader_close(reader);
+}
+
+EMSCRIPTEN_KEEPALIVE
+void set_layers(LayerType v) { layers = v; }
+
+EMSCRIPTEN_KEEPALIVE
+void set_compress(int v) { compress = v; }
diff --git a/libs/libaom/src/examples/lightfield_bitstream_parsing.c b/libs/libaom/src/examples/lightfield_bitstream_parsing.c
new file mode 100644
index 000000000..ffcbcb9cb
--- /dev/null
+++ b/libs/libaom/src/examples/lightfield_bitstream_parsing.c
@@ -0,0 +1,414 @@
+/*
+ * Copyright (c) 2018, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+// Lightfield Bitstream Parsing
+// ============================
+//
+// This is a lightfield bitstream parsing example. It takes an input file
+// containing the whole compressed lightfield bitstream(ivf file) and a text
+// file containing a stream of tiles to decode and then constructs and outputs
+// a new bitstream that can be decoded by an AV1 decoder. The output bitstream
+// contains reference frames(i.e. anchor frames), camera frame header, and
+// tile list OBUs. num_references is the number of anchor frames coded at the
+// beginning of the light field file.  After running the lightfield encoder,
+// run lightfield bitstream parsing:
+// examples/lightfield_bitstream_parsing vase10x10.ivf vase_tile_list.ivf 4
+//   tile_list.txt
+//
+// The tile_list.txt is expected to be of the form:
+// Frame <frame_index0>
+// <image_index0> <anchor_index0> <tile_col0> <tile_row0>
+// <image_index1> <anchor_index1> <tile_col1> <tile_row1>
+// ...
+// Frame <frame_index1)
+// ...
+//
+// The "Frame" markers indicate a new render frame and thus a new tile list
+// will be started and the old one flushed.  The image_indexN, anchor_indexN,
+// tile_colN, and tile_rowN identify an individual tile to be decoded and
+// to use anchor_indexN anchor image for MCP.
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "aom/aom_decoder.h"
+#include "aom/aom_encoder.h"
+#include "aom/aom_integer.h"
+#include "aom/aomdx.h"
+#include "aom_dsp/bitwriter_buffer.h"
+#include "common/tools_common.h"
+#include "common/video_reader.h"
+#include "common/video_writer.h"
+
+#define MAX_TILES 512
+
+static const char *exec_name;
+
+void usage_exit(void) {
+  fprintf(stderr, "Usage: %s <infile> <outfile> <num_references> <tile_list>\n",
+          exec_name);
+  exit(EXIT_FAILURE);
+}
+
+#define ALIGN_POWER_OF_TWO(value, n) \
+  (((value) + ((1 << (n)) - 1)) & ~((1 << (n)) - 1))
+
+const int output_frame_width = 512;
+const int output_frame_height = 512;
+
+// Spec:
+// typedef struct {
+//   uint8_t anchor_frame_idx;
+//   uint8_t tile_row;
+//   uint8_t tile_col;
+//   uint16_t coded_tile_data_size_minus_1;
+//   uint8_t *coded_tile_data;
+// } TILE_LIST_ENTRY;
+
+// Tile list entry provided by the application
+typedef struct {
+  int image_idx;
+  int reference_idx;
+  int tile_col;
+  int tile_row;
+} TILE_LIST_INFO;
+
+static int get_image_bps(aom_img_fmt_t fmt) {
+  switch (fmt) {
+    case AOM_IMG_FMT_I420: return 12;
+    case AOM_IMG_FMT_I422: return 16;
+    case AOM_IMG_FMT_I444: return 24;
+    case AOM_IMG_FMT_I42016: return 24;
+    case AOM_IMG_FMT_I42216: return 32;
+    case AOM_IMG_FMT_I44416: return 48;
+    default: die("Invalid image format");
+  }
+  return 0;
+}
+
+void process_tile_list(const TILE_LIST_INFO *tiles, int num_tiles,
+                       aom_codec_pts_t tl_pts, unsigned char **frames,
+                       const size_t *frame_sizes, aom_codec_ctx_t *codec,
+                       unsigned char *tl_buf, AvxVideoWriter *writer,
+                       uint8_t output_frame_width_in_tiles_minus_1,
+                       uint8_t output_frame_height_in_tiles_minus_1) {
+  unsigned char *tl = tl_buf;
+  struct aom_write_bit_buffer wb = { tl, 0 };
+  unsigned char *saved_obu_size_loc = NULL;
+  uint32_t tile_list_obu_header_size = 0;
+  uint32_t tile_list_obu_size = 0;
+  int num_tiles_minus_1 = num_tiles - 1;
+  int i;
+
+  // Write the tile list OBU header that is 1 byte long.
+  aom_wb_write_literal(&wb, 0, 1);  // forbidden bit.
+  aom_wb_write_literal(&wb, 8, 4);  // tile list OBU: "1000"
+  aom_wb_write_literal(&wb, 0, 1);  // obu_extension = 0
+  aom_wb_write_literal(&wb, 1, 1);  // obu_has_size_field
+  aom_wb_write_literal(&wb, 0, 1);  // reserved
+  tl++;
+  tile_list_obu_header_size++;
+
+  // Write the OBU size using a fixed length_field_size of 4 bytes.
+  saved_obu_size_loc = tl;
+  // aom_wb_write_unsigned_literal(&wb, data, bits) requires that bits <= 32.
+  aom_wb_write_unsigned_literal(&wb, 0, 32);
+  tl += 4;
+  tile_list_obu_header_size += 4;
+
+  // write_tile_list_obu()
+  aom_wb_write_literal(&wb, output_frame_width_in_tiles_minus_1, 8);
+  aom_wb_write_literal(&wb, output_frame_height_in_tiles_minus_1, 8);
+  aom_wb_write_literal(&wb, num_tiles_minus_1, 16);
+  tl += 4;
+  tile_list_obu_size += 4;
+
+  // Write each tile's data
+  for (i = 0; i <= num_tiles_minus_1; i++) {
+    aom_tile_data tile_data = { 0, NULL, 0 };
+
+    int image_idx = tiles[i].image_idx;
+    int ref_idx = tiles[i].reference_idx;
+    int tc = tiles[i].tile_col;
+    int tr = tiles[i].tile_row;
+
+    // Reset bit writer to the right location.
+    wb.bit_buffer = tl;
+    wb.bit_offset = 0;
+
+    size_t frame_size = frame_sizes[image_idx];
+    const unsigned char *frame = frames[image_idx];
+
+    AOM_CODEC_CONTROL_TYPECHECKED(codec, AV1_SET_DECODE_TILE_ROW, tr);
+    AOM_CODEC_CONTROL_TYPECHECKED(codec, AV1_SET_DECODE_TILE_COL, tc);
+
+    aom_codec_err_t aom_status =
+        aom_codec_decode(codec, frame, frame_size, NULL);
+    if (aom_status) die_codec(codec, "Failed to decode tile.");
+
+    AOM_CODEC_CONTROL_TYPECHECKED(codec, AV1D_GET_TILE_DATA, &tile_data);
+
+    // Copy over tile info.
+    //  uint8_t anchor_frame_idx;
+    //  uint8_t tile_row;
+    //  uint8_t tile_col;
+    //  uint16_t coded_tile_data_size_minus_1;
+    //  uint8_t *coded_tile_data;
+    uint32_t tile_info_bytes = 5;
+    aom_wb_write_literal(&wb, ref_idx, 8);
+    aom_wb_write_literal(&wb, tr, 8);
+    aom_wb_write_literal(&wb, tc, 8);
+    aom_wb_write_literal(&wb, (int)tile_data.coded_tile_data_size - 1, 16);
+    tl += tile_info_bytes;
+
+    memcpy(tl, (uint8_t *)tile_data.coded_tile_data,
+           tile_data.coded_tile_data_size);
+    tl += tile_data.coded_tile_data_size;
+
+    tile_list_obu_size +=
+        tile_info_bytes + (uint32_t)tile_data.coded_tile_data_size;
+  }
+
+  // Write tile list OBU size.
+  size_t bytes_written = 0;
+  if (aom_uleb_encode_fixed_size(tile_list_obu_size, 4, 4, saved_obu_size_loc,
+                                 &bytes_written))
+    die_codec(codec, "Failed to encode the tile list obu size.");
+
+  // Copy the tile list.
+  if (!aom_video_writer_write_frame(
+          writer, tl_buf, tile_list_obu_header_size + tile_list_obu_size,
+          tl_pts))
+    die_codec(codec, "Failed to copy compressed tile list.");
+}
+
+int main(int argc, char **argv) {
+  aom_codec_ctx_t codec;
+  AvxVideoReader *reader = NULL;
+  AvxVideoWriter *writer = NULL;
+  const AvxInterface *decoder = NULL;
+  const AvxVideoInfo *info = NULL;
+  int num_references;
+  int i;
+  aom_codec_pts_t pts;
+  const char *tile_list_file = NULL;
+
+  exec_name = argv[0];
+  if (argc != 5) die("Invalid number of arguments.");
+
+  reader = aom_video_reader_open(argv[1]);
+  if (!reader) die("Failed to open %s for reading.", argv[1]);
+
+  num_references = (int)strtol(argv[3], NULL, 0);
+  info = aom_video_reader_get_info(reader);
+
+  aom_video_reader_set_fourcc(reader, AV1_FOURCC);
+
+  // The writer to write out ivf file in tile list OBU, which can be decoded by
+  // AV1 decoder.
+  writer = aom_video_writer_open(argv[2], kContainerIVF, info);
+  if (!writer) die("Failed to open %s for writing", argv[2]);
+
+  tile_list_file = argv[4];
+
+  decoder = get_aom_decoder_by_fourcc(info->codec_fourcc);
+  if (!decoder) die("Unknown input codec.");
+  printf("Using %s\n", aom_codec_iface_name(decoder->codec_interface()));
+
+  if (aom_codec_dec_init(&codec, decoder->codec_interface(), NULL, 0))
+    die_codec(&codec, "Failed to initialize decoder.");
+
+  // Decode anchor frames.
+  AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1_SET_TILE_MODE, 0);
+
+  printf("Reading %d reference images.\n", num_references);
+  for (i = 0; i < num_references; ++i) {
+    aom_video_reader_read_frame(reader);
+
+    size_t frame_size = 0;
+    const unsigned char *frame =
+        aom_video_reader_get_frame(reader, &frame_size);
+    pts = (aom_codec_pts_t)aom_video_reader_get_frame_pts(reader);
+
+    // Copy references bitstream directly.
+    if (!aom_video_writer_write_frame(writer, frame, frame_size, pts))
+      die_codec(&codec, "Failed to copy compressed anchor frame.");
+
+    if (aom_codec_decode(&codec, frame, frame_size, NULL))
+      die_codec(&codec, "Failed to decode frame.");
+  }
+
+  // Decode camera frames.
+  AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1_SET_TILE_MODE, 1);
+  AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1D_EXT_TILE_DEBUG, 1);
+
+  FILE *infile = aom_video_reader_get_file(reader);
+  // Record the offset of the first camera image.
+  const FileOffset camera_frame_pos = ftello(infile);
+
+  printf("Loading compressed frames into memory.\n");
+
+  // Count the frames in the lightfield.
+  int num_frames = 0;
+  while (aom_video_reader_read_frame(reader)) {
+    ++num_frames;
+  }
+  if (num_frames < 1) die("Input light field has no frames.");
+
+  // Read all of the lightfield frames into memory.
+  unsigned char **frames =
+      (unsigned char **)malloc(num_frames * sizeof(unsigned char *));
+  size_t *frame_sizes = (size_t *)malloc(num_frames * sizeof(size_t));
+  // Seek to the first camera image.
+  fseeko(infile, camera_frame_pos, SEEK_SET);
+  for (int f = 0; f < num_frames; ++f) {
+    aom_video_reader_read_frame(reader);
+    size_t frame_size = 0;
+    const unsigned char *frame =
+        aom_video_reader_get_frame(reader, &frame_size);
+    frames[f] = (unsigned char *)malloc(frame_size * sizeof(unsigned char));
+    memcpy(frames[f], frame, frame_size);
+    frame_sizes[f] = frame_size;
+  }
+  printf("Read %d frames.\n", num_frames);
+
+  // Copy first camera frame for getting camera frame header. This is done
+  // only once.
+  {
+    size_t frame_size = frame_sizes[0];
+    const unsigned char *frame = frames[0];
+    pts = num_references;
+    aom_tile_data frame_header_info = { 0, NULL, 0 };
+
+    // Need to decode frame header to get camera frame header info. So, here
+    // decoding 1 tile is enough.
+    AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1_SET_DECODE_TILE_ROW, 0);
+    AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1_SET_DECODE_TILE_COL, 0);
+
+    aom_codec_err_t aom_status =
+        aom_codec_decode(&codec, frame, frame_size, NULL);
+    if (aom_status) die_codec(&codec, "Failed to decode tile.");
+
+    AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1D_GET_FRAME_HEADER_INFO,
+                                  &frame_header_info);
+
+    size_t obu_size_offset =
+        (uint8_t *)frame_header_info.coded_tile_data - frame;
+    size_t length_field_size = frame_header_info.coded_tile_data_size;
+    // Remove ext-tile tile info.
+    uint32_t frame_header_size = (uint32_t)frame_header_info.extra_size - 1;
+    size_t bytes_to_copy =
+        obu_size_offset + length_field_size + frame_header_size;
+
+    unsigned char *frame_hdr_buf = (unsigned char *)malloc(bytes_to_copy);
+    if (frame_hdr_buf == NULL)
+      die_codec(&codec, "Failed to allocate frame header buffer.");
+
+    memcpy(frame_hdr_buf, frame, bytes_to_copy);
+
+    // Update frame header OBU size.
+    size_t bytes_written = 0;
+    if (aom_uleb_encode_fixed_size(
+            frame_header_size, length_field_size, length_field_size,
+            frame_hdr_buf + obu_size_offset, &bytes_written))
+      die_codec(&codec, "Failed to encode the tile list obu size.");
+
+    // Copy camera frame header bitstream.
+    if (!aom_video_writer_write_frame(writer, frame_hdr_buf, bytes_to_copy,
+                                      pts))
+      die_codec(&codec, "Failed to copy compressed camera frame header.");
+    free(frame_hdr_buf);
+  }
+
+  // Read out the image format.
+  aom_img_fmt_t ref_fmt = 0;
+  if (AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1D_GET_IMG_FORMAT, &ref_fmt))
+    die_codec(&codec, "Failed to get the image format");
+  const int bps = get_image_bps(ref_fmt);
+  if (!bps) die_codec(&codec, "Invalid image format.");
+  // read out the tile size.
+  unsigned int tile_size = 0;
+  if (AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1D_GET_TILE_SIZE, &tile_size))
+    die_codec(&codec, "Failed to get the tile size");
+  const unsigned int tile_width = tile_size >> 16;
+  const unsigned int tile_height = tile_size & 65535;
+  // Allocate a buffer to store tile list bitstream.
+  const size_t data_sz = MAX_TILES * ALIGN_POWER_OF_TWO(tile_width, 5) *
+                         ALIGN_POWER_OF_TWO(tile_height, 5) * bps / 8;
+
+  unsigned char *tl_buf = (unsigned char *)malloc(data_sz);
+  if (tl_buf == NULL) die_codec(&codec, "Failed to allocate tile list buffer.");
+
+  aom_codec_pts_t tl_pts = num_references;
+  const uint8_t output_frame_width_in_tiles_minus_1 =
+      output_frame_width / tile_width - 1;
+  const uint8_t output_frame_height_in_tiles_minus_1 =
+      output_frame_height / tile_height - 1;
+
+  printf("Reading tile list from file.\n");
+  char line[1024];
+  FILE *tile_list_fptr = fopen(tile_list_file, "r");
+  if (!tile_list_fptr) die_codec(&codec, "Failed to open tile list file.");
+  int num_tiles = 0;
+  TILE_LIST_INFO tiles[MAX_TILES];
+  while ((fgets(line, 1024, tile_list_fptr)) != NULL) {
+    if (line[0] == 'F' || num_tiles >= MAX_TILES) {
+      // Flush existing tile list and start another, either because we hit a
+      // new render frame or because we've hit our max number of tiles per list.
+      if (num_tiles > 0) {
+        process_tile_list(tiles, num_tiles, tl_pts, frames, frame_sizes, &codec,
+                          tl_buf, writer, output_frame_width_in_tiles_minus_1,
+                          output_frame_height_in_tiles_minus_1);
+        ++tl_pts;
+      }
+      num_tiles = 0;
+    }
+    if (line[0] == 'F') {
+      continue;
+    }
+    if (sscanf(line, "%d %d %d %d", &tiles[num_tiles].image_idx,
+               &tiles[num_tiles].reference_idx, &tiles[num_tiles].tile_col,
+               &tiles[num_tiles].tile_row) == 4) {
+      if (tiles[num_tiles].image_idx >= num_frames) {
+        die("Tile list image_idx out of bounds: %d >= %d.",
+            tiles[num_tiles].image_idx, num_frames);
+      }
+      if (tiles[num_tiles].reference_idx >= num_references) {
+        die("Tile list reference_idx out of bounds: %d >= %d.",
+            tiles[num_tiles].reference_idx, num_references);
+      }
+      ++num_tiles;
+    }
+  }
+  if (num_tiles > 0) {
+    // Flush out the last tile list.
+    process_tile_list(tiles, num_tiles, tl_pts, frames, frame_sizes, &codec,
+                      tl_buf, writer, output_frame_width_in_tiles_minus_1,
+                      output_frame_height_in_tiles_minus_1);
+    ++tl_pts;
+  }
+
+  const int num_tile_lists = (int)(tl_pts - pts);
+  printf("Finished processing tile lists.  Num tile lists: %d.\n",
+         num_tile_lists);
+  free(tl_buf);
+  for (int f = 0; f < num_frames; ++f) {
+    free(frames[f]);
+  }
+  free(frame_sizes);
+  free(frames);
+  if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec");
+  aom_video_writer_close(writer);
+  aom_video_reader_close(reader);
+
+  return EXIT_SUCCESS;
+}
diff --git a/libs/libaom/src/examples/lightfield_decoder.c b/libs/libaom/src/examples/lightfield_decoder.c
new file mode 100644
index 000000000..a292e9c75
--- /dev/null
+++ b/libs/libaom/src/examples/lightfield_decoder.c
@@ -0,0 +1,364 @@
+/*
+ * Copyright (c) 2017, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+// Lightfield Decoder
+// ==================
+//
+// This is an example of a simple lightfield decoder. It builds upon the
+// simple_decoder.c example.  It takes an input file containing the compressed
+// data (in ivf format), treating it as a lightfield instead of a video; and a
+// text file with a list of tiles to decode. There is an optional parameter
+// allowing to choose the output format, and the supported formats are
+// YUV1D(default), YUV, and NV12.
+// After running the lightfield encoder, run lightfield decoder to decode a
+// batch of tiles:
+// examples/lightfield_decoder vase10x10.ivf vase_reference.yuv 4 tile_list.txt
+// 0(optional)
+// The tile_list.txt is expected to be of the form:
+// Frame <frame_index0>
+// <image_index0> <anchor_index0> <tile_col0> <tile_row0>
+// <image_index1> <anchor_index1> <tile_col1> <tile_row1>
+// ...
+// Frame <frame_index1)
+// ...
+//
+// The "Frame" markers indicate a new render frame and thus a new tile list
+// will be started and the old one flushed.  The image_indexN, anchor_indexN,
+// tile_colN, and tile_rowN identify an individual tile to be decoded and
+// to use anchor_indexN anchor image for MCP.
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "aom/aom_decoder.h"
+#include "aom/aomdx.h"
+#include "aom_scale/yv12config.h"
+#include "av1/common/enums.h"
+#include "common/tools_common.h"
+#include "common/video_reader.h"
+
+static const char *exec_name;
+
+void usage_exit(void) {
+  fprintf(stderr,
+          "Usage: %s <infile> <outfile> <num_references> <tile_list> <output "
+          "format(optional)>\n",
+          exec_name);
+  exit(EXIT_FAILURE);
+}
+
+// Output frame size
+const int output_frame_width = 512;
+const int output_frame_height = 512;
+
+static void aom_img_copy_tile(const aom_image_t *src, const aom_image_t *dst,
+                              int dst_row_offset, int dst_col_offset) {
+  const int shift = (src->fmt & AOM_IMG_FMT_HIGHBITDEPTH) ? 1 : 0;
+  int plane;
+
+  for (plane = 0; plane < 3; ++plane) {
+    const unsigned char *src_buf = src->planes[plane];
+    const int src_stride = src->stride[plane];
+    unsigned char *dst_buf = dst->planes[plane];
+    const int dst_stride = dst->stride[plane];
+    const int roffset =
+        (plane > 0) ? dst_row_offset >> dst->y_chroma_shift : dst_row_offset;
+    const int coffset =
+        (plane > 0) ? dst_col_offset >> dst->x_chroma_shift : dst_col_offset;
+
+    // col offset needs to be adjusted for HBD.
+    dst_buf += roffset * dst_stride + (coffset << shift);
+
+    const int w = (aom_img_plane_width(src, plane) << shift);
+    const int h = aom_img_plane_height(src, plane);
+    int y;
+
+    for (y = 0; y < h; ++y) {
+      memcpy(dst_buf, src_buf, w);
+      src_buf += src_stride;
+      dst_buf += dst_stride;
+    }
+  }
+}
+
+void decode_tile(aom_codec_ctx_t *codec, const unsigned char *frame,
+                 size_t frame_size, int tr, int tc, int ref_idx,
+                 aom_image_t *reference_images, aom_image_t *output,
+                 int *tile_idx, unsigned int *output_bit_depth,
+                 aom_image_t **img_ptr, int output_format) {
+  AOM_CODEC_CONTROL_TYPECHECKED(codec, AV1_SET_TILE_MODE, 1);
+  AOM_CODEC_CONTROL_TYPECHECKED(codec, AV1D_EXT_TILE_DEBUG, 1);
+  AOM_CODEC_CONTROL_TYPECHECKED(codec, AV1_SET_DECODE_TILE_ROW, tr);
+  AOM_CODEC_CONTROL_TYPECHECKED(codec, AV1_SET_DECODE_TILE_COL, tc);
+
+  av1_ref_frame_t ref;
+  ref.idx = 0;
+  ref.use_external_ref = 1;
+  ref.img = reference_images[ref_idx];
+  if (AOM_CODEC_CONTROL_TYPECHECKED(codec, AV1_SET_REFERENCE, &ref)) {
+    die_codec(codec, "Failed to set reference frame.");
+  }
+
+  aom_codec_err_t aom_status = aom_codec_decode(codec, frame, frame_size, NULL);
+  if (aom_status) die_codec(codec, "Failed to decode tile.");
+
+  aom_codec_iter_t iter = NULL;
+  aom_image_t *img = aom_codec_get_frame(codec, &iter);
+  if (!img) die_codec(codec, "Failed to get frame.");
+  *img_ptr = img;
+
+  // aom_img_alloc() sets bit_depth as follows:
+  // output->bit_depth = (fmt & AOM_IMG_FMT_HIGHBITDEPTH) ? 16 : 8;
+  // Use img->bit_depth(read from bitstream), so that aom_shift_img()
+  // works as expected.
+  output->bit_depth = img->bit_depth;
+  *output_bit_depth = img->bit_depth;
+
+  if (output_format != YUV1D) {
+    // read out the tile size.
+    unsigned int tile_size = 0;
+    if (AOM_CODEC_CONTROL_TYPECHECKED(codec, AV1D_GET_TILE_SIZE, &tile_size))
+      die_codec(codec, "Failed to get the tile size");
+    const unsigned int tile_width = tile_size >> 16;
+    const unsigned int tile_height = tile_size & 65535;
+    const uint32_t output_frame_width_in_tiles =
+        output_frame_width / tile_width;
+
+    // Copy the tile to the output frame.
+    const int row_offset =
+        (*tile_idx / output_frame_width_in_tiles) * tile_height;
+    const int col_offset =
+        (*tile_idx % output_frame_width_in_tiles) * tile_width;
+
+    aom_img_copy_tile(img, output, row_offset, col_offset);
+    (*tile_idx)++;
+  }
+}
+
+static void img_write_to_file(const aom_image_t *img, FILE *file,
+                              int output_format) {
+  if (output_format == YUV)
+    aom_img_write(img, file);
+  else if (output_format == NV12)
+    aom_img_write_nv12(img, file);
+  else
+    die("Invalid output format");
+}
+
+int main(int argc, char **argv) {
+  FILE *outfile = NULL;
+  aom_codec_ctx_t codec;
+  AvxVideoReader *reader = NULL;
+  const AvxInterface *decoder = NULL;
+  const AvxVideoInfo *info = NULL;
+  int num_references;
+  aom_img_fmt_t ref_fmt = 0;
+  aom_image_t reference_images[MAX_EXTERNAL_REFERENCES];
+  aom_image_t output;
+  aom_image_t *output_shifted = NULL;
+  size_t frame_size = 0;
+  const unsigned char *frame = NULL;
+  int i, j;
+  const char *tile_list_file = NULL;
+  int output_format = YUV1D;
+  exec_name = argv[0];
+
+  if (argc < 5) die("Invalid number of arguments.");
+
+  reader = aom_video_reader_open(argv[1]);
+  if (!reader) die("Failed to open %s for reading.", argv[1]);
+
+  if (!(outfile = fopen(argv[2], "wb")))
+    die("Failed to open %s for writing.", argv[2]);
+
+  num_references = (int)strtol(argv[3], NULL, 0);
+  tile_list_file = argv[4];
+
+  if (argc > 5) output_format = (int)strtol(argv[5], NULL, 0);
+  if (output_format < YUV1D || output_format > NV12)
+    die("Output format out of range [0, 2]");
+
+  info = aom_video_reader_get_info(reader);
+
+  if (info->codec_fourcc == LST_FOURCC)
+    decoder = get_aom_decoder_by_fourcc(AV1_FOURCC);
+  else
+    die("Unknown input codec.");
+  printf("Using %s\n", aom_codec_iface_name(decoder->codec_interface()));
+
+  if (aom_codec_dec_init(&codec, decoder->codec_interface(), NULL, 0))
+    die_codec(&codec, "Failed to initialize decoder.");
+
+  if (AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1D_SET_IS_ANNEXB,
+                                    info->is_annexb)) {
+    die("Failed to set annex b status");
+  }
+
+  // Decode anchor frames.
+  AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1_SET_TILE_MODE, 0);
+  for (i = 0; i < num_references; ++i) {
+    aom_video_reader_read_frame(reader);
+    frame = aom_video_reader_get_frame(reader, &frame_size);
+    if (aom_codec_decode(&codec, frame, frame_size, NULL))
+      die_codec(&codec, "Failed to decode frame.");
+
+    if (i == 0) {
+      if (AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1D_GET_IMG_FORMAT, &ref_fmt))
+        die_codec(&codec, "Failed to get the image format");
+
+      int frame_res[2];
+      if (AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1D_GET_FRAME_SIZE, frame_res))
+        die_codec(&codec, "Failed to get the image frame size");
+
+      // Allocate memory to store decoded references. Allocate memory with the
+      // border so that it can be used as a reference.
+      for (j = 0; j < num_references; j++) {
+        unsigned int border = AOM_DEC_BORDER_IN_PIXELS;
+        if (!aom_img_alloc_with_border(&reference_images[j], ref_fmt,
+                                       frame_res[0], frame_res[1], 32, 8,
+                                       border)) {
+          die("Failed to allocate references.");
+        }
+      }
+    }
+
+    if (AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1_COPY_NEW_FRAME_IMAGE,
+                                      &reference_images[i]))
+      die_codec(&codec, "Failed to copy decoded reference frame");
+
+    aom_codec_iter_t iter = NULL;
+    aom_image_t *img = NULL;
+    while ((img = aom_codec_get_frame(&codec, &iter)) != NULL) {
+      char name[1024];
+      snprintf(name, sizeof(name), "ref_%d.yuv", i);
+      printf("writing ref image to %s, %d, %d\n", name, img->d_w, img->d_h);
+      FILE *ref_file = fopen(name, "wb");
+      aom_img_write(img, ref_file);
+      fclose(ref_file);
+    }
+  }
+
+  FILE *infile = aom_video_reader_get_file(reader);
+  // Record the offset of the first camera image.
+  const FileOffset camera_frame_pos = ftello(infile);
+
+  printf("Loading compressed frames into memory.\n");
+
+  // Count the frames in the lightfield.
+  int num_frames = 0;
+  while (aom_video_reader_read_frame(reader)) {
+    ++num_frames;
+  }
+  if (num_frames < 1) die("Input light field has no frames.");
+
+  // Read all of the lightfield frames into memory.
+  unsigned char **frames =
+      (unsigned char **)malloc(num_frames * sizeof(unsigned char *));
+  size_t *frame_sizes = (size_t *)malloc(num_frames * sizeof(size_t));
+  // Seek to the first camera image.
+  fseeko(infile, camera_frame_pos, SEEK_SET);
+  for (int f = 0; f < num_frames; ++f) {
+    aom_video_reader_read_frame(reader);
+    frame = aom_video_reader_get_frame(reader, &frame_size);
+    frames[f] = (unsigned char *)malloc(frame_size * sizeof(unsigned char));
+    memcpy(frames[f], frame, frame_size);
+    frame_sizes[f] = frame_size;
+  }
+  printf("Read %d frames.\n", num_frames);
+
+  if (output_format != YUV1D) {
+    // Allocate the output frame.
+    aom_img_fmt_t out_fmt = ref_fmt;
+    if (FORCE_HIGHBITDEPTH_DECODING) out_fmt |= AOM_IMG_FMT_HIGHBITDEPTH;
+    if (!aom_img_alloc(&output, out_fmt, output_frame_width,
+                       output_frame_height, 32))
+      die("Failed to allocate output image.");
+  }
+
+  printf("Decoding tile list from file.\n");
+  char line[1024];
+  FILE *tile_list_fptr = fopen(tile_list_file, "r");
+  if (!tile_list_fptr) die_codec(&codec, "Failed to open tile list file.");
+  int tile_list_cnt = 0;
+  int tile_list_writes = 0;
+  int tile_idx = 0;
+  aom_image_t *out = NULL;
+  unsigned int output_bit_depth = 0;
+
+  while ((fgets(line, 1024, tile_list_fptr)) != NULL) {
+    if (line[0] == 'F') {
+      if (output_format != YUV1D) {
+        // Write out the tile list.
+        if (tile_list_cnt) {
+          out = &output;
+          if (output_bit_depth != 0)
+            aom_shift_img(output_bit_depth, &out, &output_shifted);
+          img_write_to_file(out, outfile, output_format);
+          tile_list_writes++;
+        }
+
+        tile_list_cnt++;
+        tile_idx = 0;
+        // Then memset the frame.
+        memset(output.img_data, 0, output.sz);
+      }
+      continue;
+    }
+
+    int image_idx, ref_idx, tc, tr;
+    sscanf(line, "%d %d %d %d", &image_idx, &ref_idx, &tc, &tr);
+    if (image_idx >= num_frames) {
+      die("Tile list image_idx out of bounds: %d >= %d.", image_idx,
+          num_frames);
+    }
+    if (ref_idx >= num_references) {
+      die("Tile list ref_idx out of bounds: %d >= %d.", ref_idx,
+          num_references);
+    }
+    frame = frames[image_idx];
+    frame_size = frame_sizes[image_idx];
+
+    aom_image_t *img = NULL;
+    decode_tile(&codec, frame, frame_size, tr, tc, ref_idx, reference_images,
+                &output, &tile_idx, &output_bit_depth, &img, output_format);
+    if (output_format == YUV1D) {
+      out = img;
+      if (output_bit_depth != 0)
+        aom_shift_img(output_bit_depth, &out, &output_shifted);
+      aom_img_write(out, outfile);
+    }
+  }
+
+  if (output_format != YUV1D) {
+    // Write out the last tile list.
+    if (tile_list_writes < tile_list_cnt) {
+      out = &output;
+      if (output_bit_depth != 0)
+        aom_shift_img(output_bit_depth, &out, &output_shifted);
+      img_write_to_file(out, outfile, output_format);
+    }
+  }
+
+  if (output_shifted) aom_img_free(output_shifted);
+  if (output_format != YUV1D) aom_img_free(&output);
+  for (i = 0; i < num_references; i++) aom_img_free(&reference_images[i]);
+  for (int f = 0; f < num_frames; ++f) {
+    free(frames[f]);
+  }
+  free(frame_sizes);
+  free(frames);
+  if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec");
+  aom_video_reader_close(reader);
+  fclose(outfile);
+
+  return EXIT_SUCCESS;
+}
diff --git a/libs/libaom/src/examples/lightfield_encoder.c b/libs/libaom/src/examples/lightfield_encoder.c
new file mode 100644
index 000000000..e80fe24f6
--- /dev/null
+++ b/libs/libaom/src/examples/lightfield_encoder.c
@@ -0,0 +1,522 @@
+/*
+ * Copyright (c) 2017, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+// Lightfield Encoder
+// ==================
+//
+// This is an example of a simple lightfield encoder.  It builds upon the
+// twopass_encoder.c example. It takes an input file in YV12 format,
+// treating it as a planar lightfield instead of a video. The img_width
+// and img_height arguments are the dimensions of the lightfield images,
+// while the lf_width and lf_height arguments are the number of
+// lightfield images in each dimension. The lf_blocksize determines the
+// number of reference images used for MCP. For example, 5 means that there
+// is a reference image for every 5x5 lightfield image block. All images
+// within a block will use the center image in that block as the reference
+// image for MCP.
+// Run "make test" to download lightfield test data: vase10x10.yuv.
+// Run lightfield encoder to encode whole lightfield:
+// examples/lightfield_encoder 1024 1024 vase10x10.yuv vase10x10.ivf 10 10 5
+
+// Note: In bitstream.c and encoder.c, define EXT_TILE_DEBUG as 1 will print
+// out the uncompressed header and the frame contexts, which can be used to
+// test the bit exactness of the headers and the frame contexts for large scale
+// tile coded frames.
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "aom/aom_encoder.h"
+#include "aom/aomcx.h"
+#include "aom_scale/yv12config.h"
+#include "av1/common/enums.h"
+#include "common/tools_common.h"
+#include "common/video_writer.h"
+
+static const char *exec_name;
+
+void usage_exit(void) {
+  fprintf(stderr,
+          "Usage: %s <img_width> <img_height> <infile> <outfile> "
+          "<lf_width> <lf_height> <lf_blocksize>\n",
+          exec_name);
+  exit(EXIT_FAILURE);
+}
+
+static int img_size_bytes(aom_image_t *img) {
+  int image_size_bytes = 0;
+  int plane;
+  for (plane = 0; plane < 3; ++plane) {
+    const int w = aom_img_plane_width(img, plane) *
+                  ((img->fmt & AOM_IMG_FMT_HIGHBITDEPTH) ? 2 : 1);
+    const int h = aom_img_plane_height(img, plane);
+    image_size_bytes += w * h;
+  }
+  return image_size_bytes;
+}
+
+static int get_frame_stats(aom_codec_ctx_t *ctx, const aom_image_t *img,
+                           aom_codec_pts_t pts, unsigned int duration,
+                           aom_enc_frame_flags_t flags,
+                           aom_fixed_buf_t *stats) {
+  int got_pkts = 0;
+  aom_codec_iter_t iter = NULL;
+  const aom_codec_cx_pkt_t *pkt = NULL;
+  const aom_codec_err_t res = aom_codec_encode(ctx, img, pts, duration, flags);
+  if (res != AOM_CODEC_OK) die_codec(ctx, "Failed to get frame stats.");
+
+  while ((pkt = aom_codec_get_cx_data(ctx, &iter)) != NULL) {
+    got_pkts = 1;
+
+    if (pkt->kind == AOM_CODEC_STATS_PKT) {
+      const uint8_t *const pkt_buf = pkt->data.twopass_stats.buf;
+      const size_t pkt_size = pkt->data.twopass_stats.sz;
+      stats->buf = realloc(stats->buf, stats->sz + pkt_size);
+      memcpy((uint8_t *)stats->buf + stats->sz, pkt_buf, pkt_size);
+      stats->sz += pkt_size;
+    }
+  }
+
+  return got_pkts;
+}
+
+static int encode_frame(aom_codec_ctx_t *ctx, const aom_image_t *img,
+                        aom_codec_pts_t pts, unsigned int duration,
+                        aom_enc_frame_flags_t flags, AvxVideoWriter *writer) {
+  int got_pkts = 0;
+  aom_codec_iter_t iter = NULL;
+  const aom_codec_cx_pkt_t *pkt = NULL;
+  const aom_codec_err_t res = aom_codec_encode(ctx, img, pts, duration, flags);
+  if (res != AOM_CODEC_OK) die_codec(ctx, "Failed to encode frame.");
+
+  while ((pkt = aom_codec_get_cx_data(ctx, &iter)) != NULL) {
+    got_pkts = 1;
+    if (pkt->kind == AOM_CODEC_CX_FRAME_PKT) {
+      const int keyframe = (pkt->data.frame.flags & AOM_FRAME_IS_KEY) != 0;
+
+      if (!aom_video_writer_write_frame(writer, pkt->data.frame.buf,
+                                        pkt->data.frame.sz,
+                                        pkt->data.frame.pts))
+        die_codec(ctx, "Failed to write compressed frame.");
+      printf(keyframe ? "K" : ".");
+      fflush(stdout);
+    }
+  }
+
+  return got_pkts;
+}
+
+static void get_raw_image(aom_image_t **frame_to_encode, aom_image_t *raw,
+                          aom_image_t *raw_shift) {
+  if (FORCE_HIGHBITDEPTH_DECODING) {
+    // Need to allocate larger buffer to use hbd internal.
+    int input_shift = 0;
+    aom_img_upshift(raw_shift, raw, input_shift);
+    *frame_to_encode = raw_shift;
+  } else {
+    *frame_to_encode = raw;
+  }
+}
+
+static aom_fixed_buf_t pass0(aom_image_t *raw, FILE *infile,
+                             const AvxInterface *encoder,
+                             const aom_codec_enc_cfg_t *cfg, int lf_width,
+                             int lf_height, int lf_blocksize, int flags,
+                             aom_image_t *raw_shift) {
+  aom_codec_ctx_t codec;
+  int frame_count = 0;
+  int image_size_bytes = img_size_bytes(raw);
+  int u_blocks, v_blocks;
+  int bu, bv;
+  aom_fixed_buf_t stats = { NULL, 0 };
+  aom_image_t *frame_to_encode;
+
+  if (aom_codec_enc_init(&codec, encoder->codec_interface(), cfg, flags))
+    die_codec(&codec, "Failed to initialize encoder");
+  if (aom_codec_control(&codec, AOME_SET_ENABLEAUTOALTREF, 0))
+    die_codec(&codec, "Failed to turn off auto altref");
+  if (aom_codec_control(&codec, AV1E_SET_FRAME_PARALLEL_DECODING, 0))
+    die_codec(&codec, "Failed to set frame parallel decoding");
+
+  // How many reference images we need to encode.
+  u_blocks = (lf_width + lf_blocksize - 1) / lf_blocksize;
+  v_blocks = (lf_height + lf_blocksize - 1) / lf_blocksize;
+
+  printf("\n First pass: ");
+
+  for (bv = 0; bv < v_blocks; ++bv) {
+    for (bu = 0; bu < u_blocks; ++bu) {
+      const int block_u_min = bu * lf_blocksize;
+      const int block_v_min = bv * lf_blocksize;
+      int block_u_end = (bu + 1) * lf_blocksize;
+      int block_v_end = (bv + 1) * lf_blocksize;
+      int u_block_size, v_block_size;
+      int block_ref_u, block_ref_v;
+
+      block_u_end = block_u_end < lf_width ? block_u_end : lf_width;
+      block_v_end = block_v_end < lf_height ? block_v_end : lf_height;
+      u_block_size = block_u_end - block_u_min;
+      v_block_size = block_v_end - block_v_min;
+      block_ref_u = block_u_min + u_block_size / 2;
+      block_ref_v = block_v_min + v_block_size / 2;
+
+      printf("A%d, ", (block_ref_u + block_ref_v * lf_width));
+      fseek(infile, (block_ref_u + block_ref_v * lf_width) * image_size_bytes,
+            SEEK_SET);
+      aom_img_read(raw, infile);
+      get_raw_image(&frame_to_encode, raw, raw_shift);
+
+      // Reference frames can be encoded encoded without tiles.
+      ++frame_count;
+      get_frame_stats(&codec, frame_to_encode, frame_count, 1,
+                      AOM_EFLAG_NO_REF_LAST2 | AOM_EFLAG_NO_REF_LAST3 |
+                          AOM_EFLAG_NO_REF_GF | AOM_EFLAG_NO_REF_ARF |
+                          AOM_EFLAG_NO_REF_BWD | AOM_EFLAG_NO_REF_ARF2 |
+                          AOM_EFLAG_NO_UPD_LAST | AOM_EFLAG_NO_UPD_GF |
+                          AOM_EFLAG_NO_UPD_ARF,
+                      &stats);
+    }
+  }
+
+  if (aom_codec_control(&codec, AV1E_SET_FRAME_PARALLEL_DECODING, 1))
+    die_codec(&codec, "Failed to set frame parallel decoding");
+
+  for (bv = 0; bv < v_blocks; ++bv) {
+    for (bu = 0; bu < u_blocks; ++bu) {
+      const int block_u_min = bu * lf_blocksize;
+      const int block_v_min = bv * lf_blocksize;
+      int block_u_end = (bu + 1) * lf_blocksize;
+      int block_v_end = (bv + 1) * lf_blocksize;
+      int u, v;
+      block_u_end = block_u_end < lf_width ? block_u_end : lf_width;
+      block_v_end = block_v_end < lf_height ? block_v_end : lf_height;
+      for (v = block_v_min; v < block_v_end; ++v) {
+        for (u = block_u_min; u < block_u_end; ++u) {
+          printf("C%d, ", (u + v * lf_width));
+          fseek(infile, (u + v * lf_width) * image_size_bytes, SEEK_SET);
+          aom_img_read(raw, infile);
+          get_raw_image(&frame_to_encode, raw, raw_shift);
+
+          ++frame_count;
+          get_frame_stats(&codec, frame_to_encode, frame_count, 1,
+                          AOM_EFLAG_NO_REF_LAST2 | AOM_EFLAG_NO_REF_LAST3 |
+                              AOM_EFLAG_NO_REF_GF | AOM_EFLAG_NO_REF_ARF |
+                              AOM_EFLAG_NO_REF_BWD | AOM_EFLAG_NO_REF_ARF2 |
+                              AOM_EFLAG_NO_UPD_LAST | AOM_EFLAG_NO_UPD_GF |
+                              AOM_EFLAG_NO_UPD_ARF | AOM_EFLAG_NO_UPD_ENTROPY,
+                          &stats);
+        }
+      }
+    }
+  }
+  // Flush encoder.
+  // No ARF, this should not be needed.
+  while (get_frame_stats(&codec, NULL, frame_count, 1, 0, &stats)) {
+  }
+
+  if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec.");
+
+  printf("\nFirst pass complete. Processed %d frames.\n", frame_count);
+
+  return stats;
+}
+
+static void pass1(aom_image_t *raw, FILE *infile, const char *outfile_name,
+                  const AvxInterface *encoder, aom_codec_enc_cfg_t *cfg,
+                  int lf_width, int lf_height, int lf_blocksize, int flags,
+                  aom_image_t *raw_shift) {
+  AvxVideoInfo info = { encoder->fourcc,
+                        cfg->g_w,
+                        cfg->g_h,
+                        { cfg->g_timebase.num, cfg->g_timebase.den },
+                        0 };
+  AvxVideoWriter *writer = NULL;
+  aom_codec_ctx_t codec;
+  int frame_count = 0;
+  int image_size_bytes = img_size_bytes(raw);
+  int bu, bv;
+  int u_blocks, v_blocks;
+  aom_image_t *frame_to_encode;
+  aom_image_t reference_images[MAX_EXTERNAL_REFERENCES];
+  int reference_image_num = 0;
+  int i;
+
+  writer = aom_video_writer_open(outfile_name, kContainerIVF, &info);
+  if (!writer) die("Failed to open %s for writing", outfile_name);
+
+  if (aom_codec_enc_init(&codec, encoder->codec_interface(), cfg, flags))
+    die_codec(&codec, "Failed to initialize encoder");
+  if (aom_codec_control(&codec, AOME_SET_ENABLEAUTOALTREF, 0))
+    die_codec(&codec, "Failed to turn off auto altref");
+  if (aom_codec_control(&codec, AV1E_SET_FRAME_PARALLEL_DECODING, 0))
+    die_codec(&codec, "Failed to set frame parallel decoding");
+  if (aom_codec_control(&codec, AV1E_ENABLE_EXT_TILE_DEBUG, 1))
+    die_codec(&codec, "Failed to enable encoder ext_tile debug");
+  if (aom_codec_control(&codec, AOME_SET_CPUUSED, 1))
+    die_codec(&codec, "Failed to set cpu-used");
+
+  // Note: The superblock is a sequence parameter and has to be the same for 1
+  // sequence. In lightfield application, must choose the superblock size(either
+  // 64x64 or 128x128) before the encoding starts. Otherwise, the default is
+  // AOM_SUPERBLOCK_SIZE_DYNAMIC, and the superblock size will be set to 64x64
+  // internally.
+  if (aom_codec_control(&codec, AV1E_SET_SUPERBLOCK_SIZE,
+                        AOM_SUPERBLOCK_SIZE_64X64))
+    die_codec(&codec, "Failed to set SB size");
+
+  u_blocks = (lf_width + lf_blocksize - 1) / lf_blocksize;
+  v_blocks = (lf_height + lf_blocksize - 1) / lf_blocksize;
+
+  reference_image_num = u_blocks * v_blocks;
+  // Set the max gf group length so the references are guaranteed to be in
+  // a different gf group than any of the regular frames. This avoids using
+  // both vbr and constant quality mode in a single group. The number of
+  // references now cannot surpass 17 because of the enforced MAX_GF_INTERVAL of
+  // 16. If it is necessary to exceed this reference frame limit, one will have
+  // to do some additional handling to ensure references are in separate gf
+  // groups from the regular frames.
+  if (aom_codec_control(&codec, AV1E_SET_MAX_GF_INTERVAL,
+                        reference_image_num - 1))
+    die_codec(&codec, "Failed to set max gf interval");
+  aom_img_fmt_t ref_fmt = AOM_IMG_FMT_I420;
+  if (FORCE_HIGHBITDEPTH_DECODING) ref_fmt |= AOM_IMG_FMT_HIGHBITDEPTH;
+  // Allocate memory with the border so that it can be used as a reference.
+  int border_in_pixels =
+      (codec.config.enc->rc_resize_mode || codec.config.enc->rc_superres_mode)
+          ? AOM_BORDER_IN_PIXELS
+          : AOM_ENC_NO_SCALE_BORDER;
+  for (i = 0; i < reference_image_num; i++) {
+    if (!aom_img_alloc_with_border(&reference_images[i], ref_fmt, cfg->g_w,
+                                   cfg->g_h, 32, 8, border_in_pixels)) {
+      die("Failed to allocate image.");
+    }
+  }
+
+  printf("\n Second pass: ");
+
+  // Encode reference images first.
+  printf("Encoding Reference Images\n");
+  for (bv = 0; bv < v_blocks; ++bv) {
+    for (bu = 0; bu < u_blocks; ++bu) {
+      const int block_u_min = bu * lf_blocksize;
+      const int block_v_min = bv * lf_blocksize;
+      int block_u_end = (bu + 1) * lf_blocksize;
+      int block_v_end = (bv + 1) * lf_blocksize;
+      int u_block_size, v_block_size;
+      int block_ref_u, block_ref_v;
+
+      block_u_end = block_u_end < lf_width ? block_u_end : lf_width;
+      block_v_end = block_v_end < lf_height ? block_v_end : lf_height;
+      u_block_size = block_u_end - block_u_min;
+      v_block_size = block_v_end - block_v_min;
+      block_ref_u = block_u_min + u_block_size / 2;
+      block_ref_v = block_v_min + v_block_size / 2;
+
+      printf("A%d, ", (block_ref_u + block_ref_v * lf_width));
+      fseek(infile, (block_ref_u + block_ref_v * lf_width) * image_size_bytes,
+            SEEK_SET);
+      aom_img_read(raw, infile);
+
+      get_raw_image(&frame_to_encode, raw, raw_shift);
+
+      // Reference frames may be encoded without tiles.
+      ++frame_count;
+      printf("Encoding reference image %d of %d\n", bv * u_blocks + bu,
+             u_blocks * v_blocks);
+      encode_frame(&codec, frame_to_encode, frame_count, 1,
+                   AOM_EFLAG_NO_REF_LAST2 | AOM_EFLAG_NO_REF_LAST3 |
+                       AOM_EFLAG_NO_REF_GF | AOM_EFLAG_NO_REF_ARF |
+                       AOM_EFLAG_NO_REF_BWD | AOM_EFLAG_NO_REF_ARF2 |
+                       AOM_EFLAG_NO_UPD_LAST | AOM_EFLAG_NO_UPD_GF |
+                       AOM_EFLAG_NO_UPD_ARF | AOM_EFLAG_NO_UPD_ENTROPY,
+                   writer);
+
+      if (aom_codec_control(&codec, AV1_COPY_NEW_FRAME_IMAGE,
+                            &reference_images[frame_count - 1]))
+        die_codec(&codec, "Failed to copy decoder reference frame");
+    }
+  }
+
+  cfg->large_scale_tile = 1;
+  // Fixed q encoding for camera frames.
+  cfg->rc_end_usage = AOM_Q;
+  if (aom_codec_enc_config_set(&codec, cfg))
+    die_codec(&codec, "Failed to configure encoder");
+
+  // The fixed q value used in encoding.
+  if (aom_codec_control(&codec, AOME_SET_CQ_LEVEL, 36))
+    die_codec(&codec, "Failed to set cq level");
+  if (aom_codec_control(&codec, AV1E_SET_FRAME_PARALLEL_DECODING, 1))
+    die_codec(&codec, "Failed to set frame parallel decoding");
+  if (aom_codec_control(&codec, AV1E_SET_SINGLE_TILE_DECODING, 1))
+    die_codec(&codec, "Failed to turn on single tile decoding");
+  // Set tile_columns and tile_rows to MAX values, which guarantees the tile
+  // size of 64 x 64 pixels(i.e. 1 SB) for <= 4k resolution.
+  if (aom_codec_control(&codec, AV1E_SET_TILE_COLUMNS, 6))
+    die_codec(&codec, "Failed to set tile width");
+  if (aom_codec_control(&codec, AV1E_SET_TILE_ROWS, 6))
+    die_codec(&codec, "Failed to set tile height");
+
+  for (bv = 0; bv < v_blocks; ++bv) {
+    for (bu = 0; bu < u_blocks; ++bu) {
+      const int block_u_min = bu * lf_blocksize;
+      const int block_v_min = bv * lf_blocksize;
+      int block_u_end = (bu + 1) * lf_blocksize;
+      int block_v_end = (bv + 1) * lf_blocksize;
+      int u, v;
+      block_u_end = block_u_end < lf_width ? block_u_end : lf_width;
+      block_v_end = block_v_end < lf_height ? block_v_end : lf_height;
+      for (v = block_v_min; v < block_v_end; ++v) {
+        for (u = block_u_min; u < block_u_end; ++u) {
+          av1_ref_frame_t ref;
+          ref.idx = 0;
+          ref.use_external_ref = 1;
+          ref.img = reference_images[bv * u_blocks + bu];
+          if (aom_codec_control(&codec, AV1_SET_REFERENCE, &ref))
+            die_codec(&codec, "Failed to set reference frame");
+
+          printf("C%d, ", (u + v * lf_width));
+          fseek(infile, (u + v * lf_width) * image_size_bytes, SEEK_SET);
+          aom_img_read(raw, infile);
+          get_raw_image(&frame_to_encode, raw, raw_shift);
+
+          ++frame_count;
+          printf("Encoding image %d of %d\n",
+                 frame_count - (u_blocks * v_blocks), lf_width * lf_height);
+          encode_frame(&codec, frame_to_encode, frame_count, 1,
+                       AOM_EFLAG_NO_REF_LAST2 | AOM_EFLAG_NO_REF_LAST3 |
+                           AOM_EFLAG_NO_REF_GF | AOM_EFLAG_NO_REF_ARF |
+                           AOM_EFLAG_NO_REF_BWD | AOM_EFLAG_NO_REF_ARF2 |
+                           AOM_EFLAG_NO_UPD_LAST | AOM_EFLAG_NO_UPD_GF |
+                           AOM_EFLAG_NO_UPD_ARF | AOM_EFLAG_NO_UPD_ENTROPY,
+                       writer);
+        }
+      }
+    }
+  }
+
+  // Flush encoder.
+  // No ARF, this should not be needed.
+  while (encode_frame(&codec, NULL, -1, 1, 0, writer)) {
+  }
+
+  for (i = 0; i < reference_image_num; i++) aom_img_free(&reference_images[i]);
+
+  if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec.");
+
+  // Modify large_scale_file fourcc.
+  if (cfg->large_scale_tile == 1)
+    aom_video_writer_set_fourcc(writer, LST_FOURCC);
+  aom_video_writer_close(writer);
+
+  printf("\nSecond pass complete. Processed %d frames.\n", frame_count);
+}
+
+int main(int argc, char **argv) {
+  FILE *infile = NULL;
+  int w, h;
+  // The number of lightfield images in the u and v dimensions.
+  int lf_width, lf_height;
+  // Defines how many images refer to the same reference image for MCP.
+  // lf_blocksize X lf_blocksize images will all use the reference image
+  // in the middle of the block of images.
+  int lf_blocksize;
+  aom_codec_ctx_t codec;
+  aom_codec_enc_cfg_t cfg;
+  aom_image_t raw;
+  aom_image_t raw_shift;
+  aom_codec_err_t res;
+  aom_fixed_buf_t stats;
+  int flags = 0;
+
+  const AvxInterface *encoder = NULL;
+  const int fps = 30;
+  const int bitrate = 200;  // kbit/s
+  const char *const width_arg = argv[1];
+  const char *const height_arg = argv[2];
+  const char *const infile_arg = argv[3];
+  const char *const outfile_arg = argv[4];
+  const char *const lf_width_arg = argv[5];
+  const char *const lf_height_arg = argv[6];
+  const char *lf_blocksize_arg = argv[7];
+  exec_name = argv[0];
+
+  if (argc < 8) die("Invalid number of arguments");
+
+  encoder = get_aom_encoder_by_name("av1");
+  if (!encoder) die("Unsupported codec.");
+
+  w = (int)strtol(width_arg, NULL, 0);
+  h = (int)strtol(height_arg, NULL, 0);
+  lf_width = (int)strtol(lf_width_arg, NULL, 0);
+  lf_height = (int)strtol(lf_height_arg, NULL, 0);
+  lf_blocksize = (int)strtol(lf_blocksize_arg, NULL, 0);
+  lf_blocksize = lf_blocksize < lf_width ? lf_blocksize : lf_width;
+  lf_blocksize = lf_blocksize < lf_height ? lf_blocksize : lf_height;
+
+  if (w <= 0 || h <= 0 || (w % 2) != 0 || (h % 2) != 0)
+    die("Invalid frame size: %dx%d", w, h);
+  if (lf_width <= 0 || lf_height <= 0)
+    die("Invalid lf_width and/or lf_height: %dx%d", lf_width, lf_height);
+  if (lf_blocksize <= 0) die("Invalid lf_blocksize: %d", lf_blocksize);
+
+  if (!aom_img_alloc(&raw, AOM_IMG_FMT_I420, w, h, 32)) {
+    die("Failed to allocate image.");
+  }
+  if (FORCE_HIGHBITDEPTH_DECODING) {
+    // Need to allocate larger buffer to use hbd internal.
+    aom_img_alloc(&raw_shift, AOM_IMG_FMT_I420 | AOM_IMG_FMT_HIGHBITDEPTH, w, h,
+                  32);
+  }
+
+  printf("Using %s\n", aom_codec_iface_name(encoder->codec_interface()));
+
+  // Configuration
+  res = aom_codec_enc_config_default(encoder->codec_interface(), &cfg, 0);
+  if (res) die_codec(&codec, "Failed to get default codec config.");
+
+  cfg.g_w = w;
+  cfg.g_h = h;
+  cfg.g_timebase.num = 1;
+  cfg.g_timebase.den = fps;
+  cfg.rc_target_bitrate = bitrate;
+  cfg.g_error_resilient = 0;  // This is required.
+  cfg.g_lag_in_frames = 0;    // need to set this since default is 19.
+  cfg.kf_mode = AOM_KF_DISABLED;
+  cfg.large_scale_tile = 0;  // Only set it to 1 for camera frame encoding.
+  cfg.g_bit_depth = AOM_BITS_8;
+  flags |= (cfg.g_bit_depth > AOM_BITS_8 || FORCE_HIGHBITDEPTH_DECODING)
+               ? AOM_CODEC_USE_HIGHBITDEPTH
+               : 0;
+
+  if (!(infile = fopen(infile_arg, "rb")))
+    die("Failed to open %s for reading", infile_arg);
+
+  // Pass 0
+  cfg.g_pass = AOM_RC_FIRST_PASS;
+  stats = pass0(&raw, infile, encoder, &cfg, lf_width, lf_height, lf_blocksize,
+                flags, &raw_shift);
+
+  // Pass 1
+  rewind(infile);
+  cfg.g_pass = AOM_RC_LAST_PASS;
+  cfg.rc_twopass_stats_in = stats;
+  pass1(&raw, infile, outfile_arg, encoder, &cfg, lf_width, lf_height,
+        lf_blocksize, flags, &raw_shift);
+  free(stats.buf);
+
+  if (FORCE_HIGHBITDEPTH_DECODING) aom_img_free(&raw_shift);
+  aom_img_free(&raw);
+  fclose(infile);
+
+  return EXIT_SUCCESS;
+}
diff --git a/libs/libaom/src/examples/lightfield_tile_list_decoder.c b/libs/libaom/src/examples/lightfield_tile_list_decoder.c
new file mode 100644
index 000000000..3b928df2c
--- /dev/null
+++ b/libs/libaom/src/examples/lightfield_tile_list_decoder.c
@@ -0,0 +1,227 @@
+/*
+ * Copyright (c) 2018, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+// Lightfield Tile List Decoder
+// ============================
+//
+// This is a lightfield tile list decoder example. It takes an input file that
+// contains the anchor frames that are references of the coded tiles, the camera
+// frame header, and tile list OBUs that include the tile information and the
+// compressed tile data. This input file is reconstructed from the encoded
+// lightfield ivf file, and is decodable by AV1 decoder. num_references is
+// the number of anchor frames coded at the beginning of the light field file.
+// num_tile_lists is the number of tile lists need to be decoded. There is an
+// optional parameter allowing to choose the output format, and the supported
+// formats are YUV1D(default), YUV, and NV12.
+// Run lightfield tile list decoder to decode an AV1 tile list file:
+// examples/lightfield_tile_list_decoder vase_tile_list.ivf vase_tile_list.yuv
+// 4 2 0(optional)
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#include "aom/aom_decoder.h"
+#include "aom/aomdx.h"
+#include "aom_scale/yv12config.h"
+#include "av1/common/enums.h"
+#include "common/tools_common.h"
+#include "common/video_reader.h"
+
+static const char *exec_name;
+
+void usage_exit(void) {
+  fprintf(stderr,
+          "Usage: %s <infile> <outfile> <num_references> <num_tile_lists> "
+          "<output format(optional)>\n",
+          exec_name);
+  exit(EXIT_FAILURE);
+}
+
+static void write_tile_yuv1d(aom_codec_ctx_t *codec, const aom_image_t *img,
+                             FILE *file) {
+  // read out the tile size.
+  unsigned int tile_size = 0;
+  if (AOM_CODEC_CONTROL_TYPECHECKED(codec, AV1D_GET_TILE_SIZE, &tile_size))
+    die_codec(codec, "Failed to get the tile size");
+  const unsigned int tile_width = tile_size >> 16;
+  const unsigned int tile_height = tile_size & 65535;
+  const uint32_t output_frame_width_in_tiles = img->d_w / tile_width;
+
+  unsigned int tile_count = 0;
+  if (AOM_CODEC_CONTROL_TYPECHECKED(codec, AV1D_GET_TILE_COUNT, &tile_count))
+    die_codec(codec, "Failed to get the tile size");
+
+  // Write tile to file.
+  const int shift = (img->fmt & AOM_IMG_FMT_HIGHBITDEPTH) ? 1 : 0;
+  unsigned int tile_idx;
+
+  for (tile_idx = 0; tile_idx < tile_count; ++tile_idx) {
+    const int row_offset =
+        (tile_idx / output_frame_width_in_tiles) * tile_height;
+    const int col_offset =
+        (tile_idx % output_frame_width_in_tiles) * tile_width;
+    int plane;
+
+    for (plane = 0; plane < 3; ++plane) {
+      const unsigned char *buf = img->planes[plane];
+      const int stride = img->stride[plane];
+      const int roffset =
+          (plane > 0) ? row_offset >> img->y_chroma_shift : row_offset;
+      const int coffset =
+          (plane > 0) ? col_offset >> img->x_chroma_shift : col_offset;
+      const int w = (plane > 0) ? ((tile_width >> img->x_chroma_shift) << shift)
+                                : (tile_width << shift);
+      const int h =
+          (plane > 0) ? (tile_height >> img->y_chroma_shift) : tile_height;
+      int y;
+
+      // col offset needs to be adjusted for HBD.
+      buf += roffset * stride + (coffset << shift);
+
+      for (y = 0; y < h; ++y) {
+        fwrite(buf, 1, w, file);
+        buf += stride;
+      }
+    }
+  }
+}
+
+int main(int argc, char **argv) {
+  FILE *outfile = NULL;
+  aom_codec_ctx_t codec;
+  AvxVideoReader *reader = NULL;
+  const AvxInterface *decoder = NULL;
+  const AvxVideoInfo *info = NULL;
+  int num_references;
+  int num_tile_lists;
+  aom_image_t reference_images[MAX_EXTERNAL_REFERENCES];
+  size_t frame_size = 0;
+  const unsigned char *frame = NULL;
+  int output_format = YUV1D;
+  int i, j, n;
+
+  exec_name = argv[0];
+
+  if (argc < 5) die("Invalid number of arguments.");
+
+  reader = aom_video_reader_open(argv[1]);
+  if (!reader) die("Failed to open %s for reading.", argv[1]);
+
+  if (!(outfile = fopen(argv[2], "wb")))
+    die("Failed to open %s for writing.", argv[2]);
+
+  num_references = (int)strtol(argv[3], NULL, 0);
+  num_tile_lists = (int)strtol(argv[4], NULL, 0);
+
+  if (argc > 5) output_format = (int)strtol(argv[5], NULL, 0);
+  if (output_format < YUV1D || output_format > NV12)
+    die("Output format out of range [0, 2]");
+
+  info = aom_video_reader_get_info(reader);
+
+  decoder = get_aom_decoder_by_fourcc(info->codec_fourcc);
+  if (!decoder) die("Unknown input codec.");
+  printf("Using %s\n", aom_codec_iface_name(decoder->codec_interface()));
+
+  if (aom_codec_dec_init(&codec, decoder->codec_interface(), NULL, 0))
+    die_codec(&codec, "Failed to initialize decoder.");
+
+  if (AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1D_SET_IS_ANNEXB,
+                                    info->is_annexb)) {
+    die("Failed to set annex b status");
+  }
+
+  // Decode anchor frames.
+  AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1_SET_TILE_MODE, 0);
+  for (i = 0; i < num_references; ++i) {
+    aom_video_reader_read_frame(reader);
+    frame = aom_video_reader_get_frame(reader, &frame_size);
+    if (aom_codec_decode(&codec, frame, frame_size, NULL))
+      die_codec(&codec, "Failed to decode frame.");
+
+    if (i == 0) {
+      aom_img_fmt_t ref_fmt = 0;
+      if (AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1D_GET_IMG_FORMAT, &ref_fmt))
+        die_codec(&codec, "Failed to get the image format");
+
+      int frame_res[2];
+      if (AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1D_GET_FRAME_SIZE, frame_res))
+        die_codec(&codec, "Failed to get the image frame size");
+
+      // Allocate memory to store decoded references. Allocate memory with the
+      // border so that it can be used as a reference.
+      for (j = 0; j < num_references; j++) {
+        unsigned int border = AOM_DEC_BORDER_IN_PIXELS;
+        if (!aom_img_alloc_with_border(&reference_images[j], ref_fmt,
+                                       frame_res[0], frame_res[1], 32, 8,
+                                       border)) {
+          die("Failed to allocate references.");
+        }
+      }
+    }
+
+    if (AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1_COPY_NEW_FRAME_IMAGE,
+                                      &reference_images[i]))
+      die_codec(&codec, "Failed to copy decoded reference frame");
+
+    aom_codec_iter_t iter = NULL;
+    aom_image_t *img = NULL;
+    while ((img = aom_codec_get_frame(&codec, &iter)) != NULL) {
+      char name[1024];
+      snprintf(name, sizeof(name), "ref_%d.yuv", i);
+      printf("writing ref image to %s, %d, %d\n", name, img->d_w, img->d_h);
+      FILE *ref_file = fopen(name, "wb");
+      aom_img_write(img, ref_file);
+      fclose(ref_file);
+    }
+  }
+
+  // Decode the lightfield.
+  AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1_SET_TILE_MODE, 1);
+
+  // Set external references.
+  av1_ext_ref_frame_t set_ext_ref = { &reference_images[0], num_references };
+  AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1D_SET_EXT_REF_PTR, &set_ext_ref);
+  // Must decode the camera frame header first.
+  aom_video_reader_read_frame(reader);
+  frame = aom_video_reader_get_frame(reader, &frame_size);
+  if (aom_codec_decode(&codec, frame, frame_size, NULL))
+    die_codec(&codec, "Failed to decode the frame.");
+  // Decode tile lists one by one.
+  for (n = 0; n < num_tile_lists; n++) {
+    aom_video_reader_read_frame(reader);
+    frame = aom_video_reader_get_frame(reader, &frame_size);
+
+    if (aom_codec_decode(&codec, frame, frame_size, NULL))
+      die_codec(&codec, "Failed to decode the tile list.");
+    aom_codec_iter_t iter = NULL;
+    aom_image_t *img = aom_codec_get_frame(&codec, &iter);
+    if (!img) die_codec(&codec, "Failed to get frame.");
+
+    if (output_format == YUV1D)
+      // write the tile to the output file in 1D format.
+      write_tile_yuv1d(&codec, img, outfile);
+    else if (output_format == YUV)
+      aom_img_write(img, outfile);
+    else
+      // NV12 output format
+      aom_img_write_nv12(img, outfile);
+  }
+
+  for (i = 0; i < num_references; i++) aom_img_free(&reference_images[i]);
+  if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec");
+  aom_video_reader_close(reader);
+  fclose(outfile);
+
+  return EXIT_SUCCESS;
+}
diff --git a/libs/libaom/src/examples/lossless_encoder.c b/libs/libaom/src/examples/lossless_encoder.c
new file mode 100644
index 000000000..e0253d2b3
--- /dev/null
+++ b/libs/libaom/src/examples/lossless_encoder.c
@@ -0,0 +1,138 @@
+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "aom/aom_encoder.h"
+#include "aom/aomcx.h"
+#include "common/tools_common.h"
+#include "common/video_writer.h"
+
+static const char *exec_name;
+
+void usage_exit(void) {
+  fprintf(stderr,
+          "lossless_encoder: Example demonstrating lossless "
+          "encoding feature. Supports raw input only.\n");
+  fprintf(stderr, "Usage: %s <width> <height> <infile> <outfile>\n", exec_name);
+  exit(EXIT_FAILURE);
+}
+
+static int encode_frame(aom_codec_ctx_t *codec, aom_image_t *img,
+                        int frame_index, int flags, AvxVideoWriter *writer) {
+  int got_pkts = 0;
+  aom_codec_iter_t iter = NULL;
+  const aom_codec_cx_pkt_t *pkt = NULL;
+  const aom_codec_err_t res =
+      aom_codec_encode(codec, img, frame_index, 1, flags);
+  if (res != AOM_CODEC_OK) die_codec(codec, "Failed to encode frame");
+
+  while ((pkt = aom_codec_get_cx_data(codec, &iter)) != NULL) {
+    got_pkts = 1;
+
+    if (pkt->kind == AOM_CODEC_CX_FRAME_PKT) {
+      const int keyframe = (pkt->data.frame.flags & AOM_FRAME_IS_KEY) != 0;
+      if (!aom_video_writer_write_frame(writer, pkt->data.frame.buf,
+                                        pkt->data.frame.sz,
+                                        pkt->data.frame.pts)) {
+        die_codec(codec, "Failed to write compressed frame");
+      }
+      printf(keyframe ? "K" : ".");
+      fflush(stdout);
+    }
+  }
+
+  return got_pkts;
+}
+
+int main(int argc, char **argv) {
+  FILE *infile = NULL;
+  aom_codec_ctx_t codec;
+  aom_codec_enc_cfg_t cfg;
+  int frame_count = 0;
+  aom_image_t raw;
+  aom_codec_err_t res;
+  AvxVideoInfo info;
+  AvxVideoWriter *writer = NULL;
+  const AvxInterface *encoder = NULL;
+  const int fps = 30;
+
+  exec_name = argv[0];
+
+  // Clear explicitly, as simply assigning "{ 0 }" generates
+  // "missing-field-initializers" warning in some compilers.
+  memset(&info, 0, sizeof(info));
+
+  if (argc < 5) die("Invalid number of arguments");
+
+  encoder = get_aom_encoder_by_name("av1");
+  if (!encoder) die("Unsupported codec.");
+
+  info.codec_fourcc = encoder->fourcc;
+  info.frame_width = (int)strtol(argv[1], NULL, 0);
+  info.frame_height = (int)strtol(argv[2], NULL, 0);
+  info.time_base.numerator = 1;
+  info.time_base.denominator = fps;
+
+  if (info.frame_width <= 0 || info.frame_height <= 0 ||
+      (info.frame_width % 2) != 0 || (info.frame_height % 2) != 0) {
+    die("Invalid frame size: %dx%d", info.frame_width, info.frame_height);
+  }
+
+  if (!aom_img_alloc(&raw, AOM_IMG_FMT_I420, info.frame_width,
+                     info.frame_height, 1)) {
+    die("Failed to allocate image.");
+  }
+
+  printf("Using %s\n", aom_codec_iface_name(encoder->codec_interface()));
+
+  res = aom_codec_enc_config_default(encoder->codec_interface(), &cfg, 0);
+  if (res) die_codec(&codec, "Failed to get default codec config.");
+
+  cfg.g_w = info.frame_width;
+  cfg.g_h = info.frame_height;
+  cfg.g_timebase.num = info.time_base.numerator;
+  cfg.g_timebase.den = info.time_base.denominator;
+
+  writer = aom_video_writer_open(argv[4], kContainerIVF, &info);
+  if (!writer) die("Failed to open %s for writing.", argv[4]);
+
+  if (!(infile = fopen(argv[3], "rb")))
+    die("Failed to open %s for reading.", argv[3]);
+
+  if (aom_codec_enc_init(&codec, encoder->codec_interface(), &cfg, 0))
+    die_codec(&codec, "Failed to initialize encoder");
+
+  if (AOM_CODEC_CONTROL_TYPECHECKED(&codec, AV1E_SET_LOSSLESS, 1))
+    die_codec(&codec, "Failed to use lossless mode");
+
+  // Encode frames.
+  while (aom_img_read(&raw, infile)) {
+    encode_frame(&codec, &raw, frame_count++, 0, writer);
+  }
+
+  // Flush encoder.
+  while (encode_frame(&codec, NULL, -1, 0, writer)) {
+  }
+
+  printf("\n");
+  fclose(infile);
+  printf("Processed %d frames.\n", frame_count);
+
+  aom_img_free(&raw);
+  if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec.");
+
+  aom_video_writer_close(writer);
+
+  return EXIT_SUCCESS;
+}
diff --git a/libs/libaom/src/examples/noise_model.c b/libs/libaom/src/examples/noise_model.c
new file mode 100644
index 000000000..d07443f9d
--- /dev/null
+++ b/libs/libaom/src/examples/noise_model.c
@@ -0,0 +1,432 @@
+/*
+ * Copyright (c) 2018, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+/*!\file
+ * \brief This is an sample binary to create noise params from input video.
+ *
+ * To allow for external denoising applications, this sample binary illustrates
+ * how to create a film grain table (film grain params as a function of time)
+ * from an input video and its corresponding denoised source.
+ *
+ * The --output-grain-table file can be passed as input to the encoder (in
+ * aomenc this is done through the "--film-grain-table" parameter).
+ *
+ * As an example, where the input source is an 854x480 yuv420p 8-bit video
+ * named "input.854_480.yuv" you would use steps similar to the following:
+ *
+ * # Run your denoiser (e.g, using hqdn3d filter):
+ * ffmpeg -vcodec rawvideo -video_size 854x480 -i input.854_480.yuv \
+ *    -vf hqdn3d=5:5:5:5 -vcodec rawvideo -an -f rawvideo \
+ *    denoised.854_480.yuv
+ *
+ * # Model the noise between the denoised version and original source:
+ * ./examples/noise_model --fps=25/1 --width=854 --height=480 --i420 \
+ *    --input-denoised=denoised.854_480.yuv --input=original.854_480.yuv \
+ *    --output-grain-table=film_grain.tbl
+ *
+ * # Encode with your favorite settings (including the grain table):
+ * aomenc --limit=100  --cpu-used=4 --input-bit-depth=8                  \
+ *    --i420 -w 854 -h 480 --end-usage=q --cq-level=25 --lag-in-frames=25 \
+ *    --auto-alt-ref=2 --bit-depth=8 --film-grain-table=film_grain.tbl \
+ *    -o denoised_with_grain_params.ivf denoised.854_480.yuv
+ */
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "aom/aom_encoder.h"
+#include "aom_dsp/aom_dsp_common.h"
+
+#if CONFIG_AV1_DECODER
+#include "aom_dsp/grain_synthesis.h"
+#endif
+
+#include "aom_dsp/grain_table.h"
+#include "aom_dsp/noise_model.h"
+#include "aom_dsp/noise_util.h"
+#include "aom_mem/aom_mem.h"
+#include "common/args.h"
+#include "common/tools_common.h"
+#include "common/video_writer.h"
+
+static const char *exec_name;
+
+void usage_exit(void) {
+  fprintf(stderr,
+          "Usage: %s --input=<input> --input-denoised=<denoised> "
+          "--output-grain-table=<outfile> "
+          "See comments in noise_model.c for more information.\n",
+          exec_name);
+  exit(EXIT_FAILURE);
+}
+
+static const arg_def_t help =
+    ARG_DEF(NULL, "help", 0, "Show usage options and exit");
+static const arg_def_t width_arg =
+    ARG_DEF("w", "width", 1, "Input width (if rawvideo)");
+static const arg_def_t height_arg =
+    ARG_DEF("h", "height", 1, "Input height (if rawvideo)");
+static const arg_def_t skip_frames_arg =
+    ARG_DEF("s", "skip-frames", 1, "Number of frames to skip (default = 1)");
+static const arg_def_t fps_arg = ARG_DEF(NULL, "fps", 1, "Frame rate");
+static const arg_def_t input_arg = ARG_DEF("-i", "input", 1, "Input filename");
+static const arg_def_t output_grain_table_arg =
+    ARG_DEF("n", "output-grain-table", 1, "Output noise file");
+static const arg_def_t input_denoised_arg =
+    ARG_DEF("d", "input-denoised", 1, "Input denoised filename (YUV) only");
+static const arg_def_t flat_block_finder_arg =
+    ARG_DEF("b", "flat-block-finder", 1, "Run the flat block finder");
+static const arg_def_t block_size_arg =
+    ARG_DEF("b", "block-size", 1, "Block size");
+static const arg_def_t bit_depth_arg =
+    ARG_DEF(NULL, "bit-depth", 1, "Bit depth of input");
+static const arg_def_t use_i420 =
+    ARG_DEF(NULL, "i420", 0, "Input file (and denoised) is I420 (default)");
+static const arg_def_t use_i422 =
+    ARG_DEF(NULL, "i422", 0, "Input file (and denoised) is I422");
+static const arg_def_t use_i444 =
+    ARG_DEF(NULL, "i444", 0, "Input file (and denoised) is I444");
+static const arg_def_t debug_file_arg =
+    ARG_DEF(NULL, "debug-file", 1, "File to output debug info");
+
+typedef struct {
+  int width;
+  int height;
+  struct aom_rational fps;
+  const char *input;
+  const char *input_denoised;
+  const char *output_grain_table;
+  int img_fmt;
+  int block_size;
+  int bit_depth;
+  int run_flat_block_finder;
+  int force_flat_psd;
+  int skip_frames;
+  const char *debug_file;
+} noise_model_args_t;
+
+static void parse_args(noise_model_args_t *noise_args, int *argc, char **argv) {
+  struct arg arg;
+  static const arg_def_t *main_args[] = { &help,
+                                          &input_arg,
+                                          &fps_arg,
+                                          &width_arg,
+                                          &height_arg,
+                                          &block_size_arg,
+                                          &output_grain_table_arg,
+                                          &input_denoised_arg,
+                                          &use_i420,
+                                          &use_i422,
+                                          &use_i444,
+                                          &debug_file_arg,
+                                          NULL };
+  for (int argi = *argc + 1; *argv; argi++, argv++) {
+    if (arg_match(&arg, &help, argv)) {
+      fprintf(stdout, "\nOptions:\n");
+      arg_show_usage(stdout, main_args);
+      exit(0);
+    } else if (arg_match(&arg, &width_arg, argv)) {
+      noise_args->width = atoi(arg.val);
+    } else if (arg_match(&arg, &height_arg, argv)) {
+      noise_args->height = atoi(arg.val);
+    } else if (arg_match(&arg, &input_arg, argv)) {
+      noise_args->input = arg.val;
+    } else if (arg_match(&arg, &input_denoised_arg, argv)) {
+      noise_args->input_denoised = arg.val;
+    } else if (arg_match(&arg, &output_grain_table_arg, argv)) {
+      noise_args->output_grain_table = arg.val;
+    } else if (arg_match(&arg, &block_size_arg, argv)) {
+      noise_args->block_size = atoi(arg.val);
+    } else if (arg_match(&arg, &bit_depth_arg, argv)) {
+      noise_args->bit_depth = atoi(arg.val);
+    } else if (arg_match(&arg, &flat_block_finder_arg, argv)) {
+      noise_args->run_flat_block_finder = atoi(arg.val);
+    } else if (arg_match(&arg, &fps_arg, argv)) {
+      noise_args->fps = arg_parse_rational(&arg);
+    } else if (arg_match(&arg, &use_i420, argv)) {
+      noise_args->img_fmt = AOM_IMG_FMT_I420;
+    } else if (arg_match(&arg, &use_i422, argv)) {
+      noise_args->img_fmt = AOM_IMG_FMT_I422;
+    } else if (arg_match(&arg, &use_i444, argv)) {
+      noise_args->img_fmt = AOM_IMG_FMT_I444;
+    } else if (arg_match(&arg, &skip_frames_arg, argv)) {
+      noise_args->skip_frames = atoi(arg.val);
+    } else if (arg_match(&arg, &debug_file_arg, argv)) {
+      noise_args->debug_file = arg.val;
+    } else {
+      fprintf(stdout, "Unknown arg: %s\n\nUsage:\n", *argv);
+      arg_show_usage(stdout, main_args);
+      exit(0);
+    }
+  }
+  if (noise_args->bit_depth > 8) {
+    noise_args->img_fmt |= AOM_IMG_FMT_HIGHBITDEPTH;
+  }
+}
+
+#if CONFIG_AV1_DECODER
+static void print_variance_y(FILE *debug_file, aom_image_t *raw,
+                             aom_image_t *denoised, const uint8_t *flat_blocks,
+                             int block_size, aom_film_grain_t *grain) {
+  aom_image_t renoised;
+  grain->apply_grain = 1;
+  grain->random_seed = 7391;
+  grain->bit_depth = raw->bit_depth;
+  aom_img_alloc(&renoised, raw->fmt, raw->w, raw->h, 1);
+
+  if (av1_add_film_grain(grain, denoised, &renoised)) {
+    fprintf(stderr, "Internal failure in av1_add_film_grain().\n");
+    aom_img_free(&renoised);
+    return;
+  }
+
+  const int num_blocks_w = (raw->w + block_size - 1) / block_size;
+  const int num_blocks_h = (raw->h + block_size - 1) / block_size;
+  fprintf(debug_file, "x = [");
+  for (int by = 0; by < num_blocks_h; by++) {
+    for (int bx = 0; bx < num_blocks_w; bx++) {
+      double block_mean = 0;
+      double noise_std = 0, noise_mean = 0;
+      double renoise_std = 0, renoise_mean = 0;
+      for (int yi = 0; yi < block_size; ++yi) {
+        const int y = by * block_size + yi;
+        for (int xi = 0; xi < block_size; ++xi) {
+          const int x = bx * block_size + xi;
+          const double noise_v = (raw->planes[0][y * raw->stride[0] + x] -
+                                  denoised->planes[0][y * raw->stride[0] + x]);
+          noise_mean += noise_v;
+          noise_std += noise_v * noise_v;
+
+          block_mean += raw->planes[0][y * raw->stride[0] + x];
+
+          const double renoise_v =
+              (renoised.planes[0][y * raw->stride[0] + x] -
+               denoised->planes[0][y * raw->stride[0] + x]);
+          renoise_mean += renoise_v;
+          renoise_std += renoise_v * renoise_v;
+        }
+      }
+      int n = (block_size * block_size);
+      block_mean /= n;
+      noise_mean /= n;
+      renoise_mean /= n;
+      noise_std = sqrt(noise_std / n - noise_mean * noise_mean);
+      renoise_std = sqrt(renoise_std / n - renoise_mean * renoise_mean);
+      fprintf(debug_file, "%d %3.2lf %3.2lf %3.2lf  ",
+              flat_blocks[by * num_blocks_w + bx], block_mean, noise_std,
+              renoise_std);
+    }
+    fprintf(debug_file, "\n");
+  }
+  fprintf(debug_file, "];\n");
+
+  if (raw->fmt & AOM_IMG_FMT_HIGHBITDEPTH) {
+    fprintf(stderr,
+            "Detailed debug info not supported for high bit"
+            "depth formats\n");
+  } else {
+    fprintf(debug_file, "figure(2); clf;\n");
+    fprintf(debug_file,
+            "scatter(x(:, 2:4:end), x(:, 3:4:end), 'r'); hold on;\n");
+    fprintf(debug_file, "scatter(x(:, 2:4:end), x(:, 4:4:end), 'b');\n");
+    fprintf(debug_file,
+            "plot(linspace(0, 255, length(noise_strength_0)), "
+            "noise_strength_0, 'b');\n");
+    fprintf(debug_file,
+            "title('Scatter plot of intensity vs noise strength');\n");
+    fprintf(debug_file,
+            "legend('Actual', 'Estimated', 'Estimated strength');\n");
+    fprintf(debug_file, "figure(3); clf;\n");
+    fprintf(debug_file, "scatter(x(:, 3:4:end), x(:, 4:4:end), 'k');\n");
+    fprintf(debug_file, "title('Actual vs Estimated');\n");
+    fprintf(debug_file, "pause(3);\n");
+  }
+  aom_img_free(&renoised);
+}
+#endif
+
+static void print_debug_info(FILE *debug_file, aom_image_t *raw,
+                             aom_image_t *denoised, uint8_t *flat_blocks,
+                             int block_size, aom_noise_model_t *noise_model) {
+  (void)raw;
+  (void)denoised;
+  (void)flat_blocks;
+  (void)block_size;
+  fprintf(debug_file, "figure(3); clf;\n");
+  fprintf(debug_file, "figure(2); clf;\n");
+  fprintf(debug_file, "figure(1); clf;\n");
+  for (int c = 0; c < 3; ++c) {
+    fprintf(debug_file, "noise_strength_%d = [\n", c);
+    const aom_equation_system_t *eqns =
+        &noise_model->combined_state[c].strength_solver.eqns;
+    for (int k = 0; k < eqns->n; ++k) {
+      fprintf(debug_file, "%lf ", eqns->x[k]);
+    }
+    fprintf(debug_file, "];\n");
+    fprintf(debug_file, "plot(noise_strength_%d); hold on;\n", c);
+  }
+  fprintf(debug_file, "legend('Y', 'cb', 'cr');\n");
+  fprintf(debug_file, "title('Noise strength function');\n");
+
+#if CONFIG_AV1_DECODER
+  aom_film_grain_t grain;
+  aom_noise_model_get_grain_parameters(noise_model, &grain);
+  print_variance_y(debug_file, raw, denoised, flat_blocks, block_size, &grain);
+#endif
+  fflush(debug_file);
+}
+
+int main(int argc, char *argv[]) {
+  noise_model_args_t args = { 0,  0, { 25, 1 }, 0, 0, 0,   AOM_IMG_FMT_I420,
+                              32, 8, 1,         0, 1, NULL };
+  aom_image_t raw, denoised;
+  FILE *infile = NULL;
+  AvxVideoInfo info;
+
+  memset(&info, 0, sizeof(info));
+
+  exec_name = argv[0];
+  parse_args(&args, &argc, argv + 1);
+
+  info.frame_width = args.width;
+  info.frame_height = args.height;
+  info.time_base.numerator = args.fps.den;
+  info.time_base.denominator = args.fps.num;
+
+  if (info.frame_width <= 0 || info.frame_height <= 0 ||
+      (info.frame_width % 2) != 0 || (info.frame_height % 2) != 0) {
+    die("Invalid frame size: %dx%d", info.frame_width, info.frame_height);
+  }
+  if (!aom_img_alloc(&raw, args.img_fmt, info.frame_width, info.frame_height,
+                     1)) {
+    die("Failed to allocate image.");
+  }
+  if (!aom_img_alloc(&denoised, args.img_fmt, info.frame_width,
+                     info.frame_height, 1)) {
+    die("Failed to allocate image.");
+  }
+  infile = fopen(args.input, "rb");
+  if (!infile) {
+    die("Failed to open input file:", args.input);
+  }
+  fprintf(stderr, "Bit depth: %d  stride:%d\n", args.bit_depth, raw.stride[0]);
+
+  const int high_bd = args.bit_depth > 8;
+  const int block_size = args.block_size;
+  aom_flat_block_finder_t block_finder;
+  aom_flat_block_finder_init(&block_finder, block_size, args.bit_depth,
+                             high_bd);
+
+  const int num_blocks_w = (info.frame_width + block_size - 1) / block_size;
+  const int num_blocks_h = (info.frame_height + block_size - 1) / block_size;
+  uint8_t *flat_blocks = (uint8_t *)aom_malloc(num_blocks_w * num_blocks_h);
+  // Sets the random seed on the first entry in the output table
+  int16_t random_seed = 7391;
+  aom_noise_model_t noise_model;
+  aom_noise_model_params_t params = { AOM_NOISE_SHAPE_SQUARE, 3, args.bit_depth,
+                                      high_bd };
+  aom_noise_model_init(&noise_model, params);
+
+  FILE *denoised_file = 0;
+  if (args.input_denoised) {
+    denoised_file = fopen(args.input_denoised, "rb");
+    if (!denoised_file)
+      die("Unable to open input_denoised: %s", args.input_denoised);
+  } else {
+    die("--input-denoised file must be specified");
+  }
+  FILE *debug_file = 0;
+  if (args.debug_file) {
+    debug_file = fopen(args.debug_file, "w");
+  }
+  aom_film_grain_table_t grain_table = { 0, 0 };
+
+  int64_t prev_timestamp = 0;
+  int frame_count = 0;
+  while (aom_img_read(&raw, infile)) {
+    if (args.input_denoised) {
+      if (!aom_img_read(&denoised, denoised_file)) {
+        die("Unable to read input denoised file");
+      }
+    }
+    if (frame_count % args.skip_frames == 0) {
+      int num_flat_blocks = num_blocks_w * num_blocks_h;
+      memset(flat_blocks, 1, num_flat_blocks);
+      if (args.run_flat_block_finder) {
+        memset(flat_blocks, 0, num_flat_blocks);
+        num_flat_blocks = aom_flat_block_finder_run(
+            &block_finder, raw.planes[0], info.frame_width, info.frame_height,
+            info.frame_width, flat_blocks);
+        fprintf(stdout, "Num flat blocks %d\n", num_flat_blocks);
+      }
+
+      const uint8_t *planes[3] = { raw.planes[0], raw.planes[1],
+                                   raw.planes[2] };
+      uint8_t *denoised_planes[3] = { denoised.planes[0], denoised.planes[1],
+                                      denoised.planes[2] };
+      int strides[3] = { raw.stride[0] >> high_bd, raw.stride[1] >> high_bd,
+                         raw.stride[2] >> high_bd };
+      int chroma_sub[3] = { raw.x_chroma_shift, raw.y_chroma_shift, 0 };
+
+      fprintf(stdout, "Updating noise model...\n");
+      aom_noise_status_t status = aom_noise_model_update(
+          &noise_model, (const uint8_t *const *)planes,
+          (const uint8_t *const *)denoised_planes, info.frame_width,
+          info.frame_height, strides, chroma_sub, flat_blocks, block_size);
+
+      int64_t cur_timestamp =
+          frame_count * 10000000ULL * args.fps.den / args.fps.num;
+      if (status == AOM_NOISE_STATUS_DIFFERENT_NOISE_TYPE) {
+        fprintf(stdout,
+                "Noise type is different, updating parameters for time "
+                "[ %" PRId64 ", %" PRId64 ")\n",
+                prev_timestamp, cur_timestamp);
+        aom_film_grain_t grain;
+        aom_noise_model_get_grain_parameters(&noise_model, &grain);
+        grain.random_seed = random_seed;
+        random_seed = 0;
+        aom_film_grain_table_append(&grain_table, prev_timestamp, cur_timestamp,
+                                    &grain);
+        aom_noise_model_save_latest(&noise_model);
+        prev_timestamp = cur_timestamp;
+      }
+      if (debug_file) {
+        print_debug_info(debug_file, &raw, &denoised, flat_blocks, block_size,
+                         &noise_model);
+      }
+      fprintf(stdout, "Done noise model update, status = %d\n", status);
+    }
+    frame_count++;
+  }
+
+  aom_film_grain_t grain;
+  aom_noise_model_get_grain_parameters(&noise_model, &grain);
+  grain.random_seed = random_seed;
+  aom_film_grain_table_append(&grain_table, prev_timestamp, INT64_MAX, &grain);
+  if (args.output_grain_table) {
+    struct aom_internal_error_info error_info;
+    if (AOM_CODEC_OK != aom_film_grain_table_write(&grain_table,
+                                                   args.output_grain_table,
+                                                   &error_info)) {
+      die("Unable to write output film grain table");
+    }
+  }
+  aom_film_grain_table_free(&grain_table);
+
+  if (infile) fclose(infile);
+  if (denoised_file) fclose(denoised_file);
+  if (debug_file) fclose(debug_file);
+  aom_img_free(&raw);
+  aom_img_free(&denoised);
+
+  return EXIT_SUCCESS;
+}
diff --git a/libs/libaom/src/examples/resize_util.c b/libs/libaom/src/examples/resize_util.c
new file mode 100644
index 000000000..5692c2062
--- /dev/null
+++ b/libs/libaom/src/examples/resize_util.c
@@ -0,0 +1,125 @@
+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+#include <assert.h>
+#include <limits.h>
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "av1/common/resize.h"
+#include "common/tools_common.h"
+
+static const char *exec_name = NULL;
+
+static void usage() {
+  printf("Usage:\n");
+  printf("%s <input_yuv> <width>x<height> <target_width>x<target_height> ",
+         exec_name);
+  printf("<output_yuv> [<frames>]\n");
+}
+
+void usage_exit(void) {
+  usage();
+  exit(EXIT_FAILURE);
+}
+
+static int parse_dim(char *v, int *width, int *height) {
+  char *x = strchr(v, 'x');
+  if (x == NULL) x = strchr(v, 'X');
+  if (x == NULL) return 0;
+  *width = atoi(v);
+  *height = atoi(&x[1]);
+  if (*width <= 0 || *height <= 0)
+    return 0;
+  else
+    return 1;
+}
+
+int main(int argc, char *argv[]) {
+  char *fin, *fout;
+  FILE *fpin, *fpout;
+  uint8_t *inbuf, *outbuf;
+  uint8_t *inbuf_u, *outbuf_u;
+  uint8_t *inbuf_v, *outbuf_v;
+  int f, frames;
+  int width, height, target_width, target_height;
+
+  exec_name = argv[0];
+
+  if (argc < 5) {
+    printf("Incorrect parameters:\n");
+    usage();
+    return 1;
+  }
+
+  fin = argv[1];
+  fout = argv[4];
+  if (!parse_dim(argv[2], &width, &height)) {
+    printf("Incorrect parameters: %s\n", argv[2]);
+    usage();
+    return 1;
+  }
+  if (!parse_dim(argv[3], &target_width, &target_height)) {
+    printf("Incorrect parameters: %s\n", argv[3]);
+    usage();
+    return 1;
+  }
+
+  fpin = fopen(fin, "rb");
+  if (fpin == NULL) {
+    printf("Can't open file %s to read\n", fin);
+    usage();
+    return 1;
+  }
+  fpout = fopen(fout, "wb");
+  if (fpout == NULL) {
+    fclose(fpin);
+    printf("Can't open file %s to write\n", fout);
+    usage();
+    return 1;
+  }
+  if (argc >= 6)
+    frames = atoi(argv[5]);
+  else
+    frames = INT_MAX;
+
+  printf("Input size:  %dx%d\n", width, height);
+  printf("Target size: %dx%d, Frames: ", target_width, target_height);
+  if (frames == INT_MAX)
+    printf("All\n");
+  else
+    printf("%d\n", frames);
+
+  inbuf = (uint8_t *)malloc(width * height * 3 / 2);
+  outbuf = (uint8_t *)malloc(target_width * target_height * 3 / 2);
+  inbuf_u = inbuf + width * height;
+  inbuf_v = inbuf_u + width * height / 4;
+  outbuf_u = outbuf + target_width * target_height;
+  outbuf_v = outbuf_u + target_width * target_height / 4;
+  f = 0;
+  while (f < frames) {
+    if (fread(inbuf, width * height * 3 / 2, 1, fpin) != 1) break;
+    av1_resize_frame420(inbuf, width, inbuf_u, inbuf_v, width / 2, height,
+                        width, outbuf, target_width, outbuf_u, outbuf_v,
+                        target_width / 2, target_height, target_width);
+    fwrite(outbuf, target_width * target_height * 3 / 2, 1, fpout);
+    f++;
+  }
+  printf("%d frames processed\n", f);
+  fclose(fpin);
+  fclose(fpout);
+
+  free(inbuf);
+  free(outbuf);
+  return 0;
+}
diff --git a/libs/libaom/src/examples/scalable_decoder.c b/libs/libaom/src/examples/scalable_decoder.c
new file mode 100644
index 000000000..c22924223
--- /dev/null
+++ b/libs/libaom/src/examples/scalable_decoder.c
@@ -0,0 +1,185 @@
+/*
+ * Copyright (c) 2018, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+// Scalable Decoder
+// ==============
+//
+// This is an example of a scalable decoder loop. It takes a 2-spatial-layer
+// input file
+// containing the compressed data (in OBU format), passes it through the
+// decoder, and writes the decompressed frames to disk. The base layer and
+// enhancement layers are stored as separate files, out_lyr0.yuv and
+// out_lyr1.yuv, respectively.
+//
+// Standard Includes
+// -----------------
+// For decoders, you only have to include `aom_decoder.h` and then any
+// header files for the specific codecs you use. In this case, we're using
+// av1.
+//
+// Initializing The Codec
+// ----------------------
+// The libaom decoder is initialized by the call to aom_codec_dec_init().
+// Determining the codec interface to use is handled by AvxVideoReader and the
+// functions prefixed with aom_video_reader_. Discussion of those functions is
+// beyond the scope of this example, but the main gist is to open the input file
+// and parse just enough of it to determine if it's a AVx file and which AVx
+// codec is contained within the file.
+// Note the NULL pointer passed to aom_codec_dec_init(). We do that in this
+// example because we want the algorithm to determine the stream configuration
+// (width/height) and allocate memory automatically.
+//
+// Decoding A Frame
+// ----------------
+// Once the frame has been read into memory, it is decoded using the
+// `aom_codec_decode` function. The call takes a pointer to the data
+// (`frame`) and the length of the data (`frame_size`). No application data
+// is associated with the frame in this example, so the `user_priv`
+// parameter is NULL. The `deadline` parameter is left at zero for this
+// example. This parameter is generally only used when doing adaptive post
+// processing.
+//
+// Codecs may produce a variable number of output frames for every call to
+// `aom_codec_decode`. These frames are retrieved by the
+// `aom_codec_get_frame` iterator function. The iterator variable `iter` is
+// initialized to NULL each time `aom_codec_decode` is called.
+// `aom_codec_get_frame` is called in a loop, returning a pointer to a
+// decoded image or NULL to indicate the end of list.
+//
+// Processing The Decoded Data
+// ---------------------------
+// In this example, we simply write the encoded data to disk. It is
+// important to honor the image's `stride` values.
+//
+// Cleanup
+// -------
+// The `aom_codec_destroy` call frees any memory allocated by the codec.
+//
+// Error Handling
+// --------------
+// This example does not special case any error return codes. If there was
+// an error, a descriptive message is printed and the program exits. With
+// few exceptions, aom_codec functions return an enumerated error status,
+// with the value `0` indicating success.
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "aom/aom_decoder.h"
+#include "aom/aomdx.h"
+#include "common/obudec.h"
+#include "common/tools_common.h"
+#include "common/video_reader.h"
+
+static const char *exec_name;
+
+#define MAX_LAYERS 5
+
+void usage_exit(void) {
+  fprintf(stderr, "Usage: %s <infile>\n", exec_name);
+  exit(EXIT_FAILURE);
+}
+
+int main(int argc, char **argv) {
+  int frame_cnt = 0;
+  FILE *outfile[MAX_LAYERS];
+  char filename[80];
+  aom_codec_ctx_t codec;
+  const AvxInterface *decoder = NULL;
+  FILE *inputfile = NULL;
+  uint8_t *buf = NULL;
+  size_t bytes_in_buffer = 0;
+  size_t buffer_size = 0;
+  struct AvxInputContext aom_input_ctx;
+  struct ObuDecInputContext obu_ctx = { &aom_input_ctx, NULL, 0, 0, 0 };
+  aom_codec_stream_info_t si;
+  uint8_t tmpbuf[32];
+  unsigned int i;
+
+  exec_name = argv[0];
+
+  if (argc != 2) die("Invalid number of arguments.");
+
+  if (!(inputfile = fopen(argv[1], "rb")))
+    die("Failed to open %s for read.", argv[1]);
+  obu_ctx.avx_ctx->file = inputfile;
+  obu_ctx.avx_ctx->filename = argv[1];
+
+  decoder = get_aom_decoder_by_index(0);
+  printf("Using %s\n", aom_codec_iface_name(decoder->codec_interface()));
+
+  if (aom_codec_dec_init(&codec, decoder->codec_interface(), NULL, 0))
+    die_codec(&codec, "Failed to initialize decoder.");
+
+  if (aom_codec_control(&codec, AV1D_SET_OUTPUT_ALL_LAYERS, 1)) {
+    die_codec(&codec, "Failed to set output_all_layers control.");
+  }
+
+  // peak sequence header OBU to get number of spatial layers
+  const size_t ret = fread(tmpbuf, 1, 32, inputfile);
+  if (ret != 32) die_codec(&codec, "Input is not a valid obu file");
+  si.is_annexb = 0;
+  if (aom_codec_peek_stream_info(decoder->codec_interface(), tmpbuf, 32, &si)) {
+    die_codec(&codec, "Input is not a valid obu file");
+  }
+  fseek(inputfile, -32, SEEK_CUR);
+
+  if (!file_is_obu(&obu_ctx))
+    die_codec(&codec, "Input is not a valid obu file");
+
+  // open base layer output yuv file
+  snprintf(filename, sizeof(filename), "out_lyr%d.yuv", 0);
+  if (!(outfile[0] = fopen(filename, "wb")))
+    die("Failed top open output for writing.");
+
+  // open any enhancement layer output yuv files
+  for (i = 1; i < si.number_spatial_layers; i++) {
+    snprintf(filename, sizeof(filename), "out_lyr%d.yuv", i);
+    if (!(outfile[i] = fopen(filename, "wb")))
+      die("Failed to open output for writing.");
+  }
+
+  while (!obudec_read_temporal_unit(&obu_ctx, &buf, &bytes_in_buffer,
+                                    &buffer_size)) {
+    aom_codec_iter_t iter = NULL;
+    aom_image_t *img = NULL;
+    if (aom_codec_decode(&codec, buf, bytes_in_buffer, NULL))
+      die_codec(&codec, "Failed to decode frame.");
+
+    while ((img = aom_codec_get_frame(&codec, &iter)) != NULL) {
+      aom_image_t *img_shifted =
+          aom_img_alloc(NULL, AOM_IMG_FMT_I420, img->d_w, img->d_h, 16);
+      img_shifted->bit_depth = 8;
+      aom_img_downshift(img_shifted, img,
+                        img->bit_depth - img_shifted->bit_depth);
+      if (img->spatial_id == 0) {
+        printf("Writing        base layer 0 %d\n", frame_cnt);
+        aom_img_write(img_shifted, outfile[0]);
+      } else if (img->spatial_id <= (int)(si.number_spatial_layers - 1)) {
+        printf("Writing enhancement layer %d %d\n", img->spatial_id, frame_cnt);
+        aom_img_write(img_shifted, outfile[img->spatial_id]);
+      } else {
+        die_codec(&codec, "Invalid bitstream. Layer id exceeds layer count");
+      }
+      if (img->spatial_id == (int)(si.number_spatial_layers - 1)) ++frame_cnt;
+    }
+  }
+
+  printf("Processed %d frames.\n", frame_cnt);
+  if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec");
+
+  for (i = 0; i < si.number_spatial_layers; i++) fclose(outfile[i]);
+
+  fclose(inputfile);
+
+  return EXIT_SUCCESS;
+}
diff --git a/libs/libaom/src/examples/scalable_encoder.c b/libs/libaom/src/examples/scalable_encoder.c
new file mode 100644
index 000000000..7af03e29f
--- /dev/null
+++ b/libs/libaom/src/examples/scalable_encoder.c
@@ -0,0 +1,289 @@
+/*
+ * Copyright (c) 2018, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+// Scalable Encoder
+// ==============
+//
+// This is an example of a scalable encoder loop. It takes two input files in
+// YV12 format, passes it through the encoder, and writes the compressed
+// frames to disk in OBU format.
+//
+// Getting The Default Configuration
+// ---------------------------------
+// Encoders have the notion of "usage profiles." For example, an encoder
+// may want to publish default configurations for both a video
+// conferencing application and a best quality offline encoder. These
+// obviously have very different default settings. Consult the
+// documentation for your codec to see if it provides any default
+// configurations. All codecs provide a default configuration, number 0,
+// which is valid for material in the vacinity of QCIF/QVGA.
+//
+// Updating The Configuration
+// ---------------------------------
+// Almost all applications will want to update the default configuration
+// with settings specific to their usage. Here we set the width and height
+// of the video file to that specified on the command line. We also scale
+// the default bitrate based on the ratio between the default resolution
+// and the resolution specified on the command line.
+//
+// Encoding A Frame
+// ----------------
+// The frame is read as a continuous block (size = width * height * 3 / 2)
+// from the input file. If a frame was read (the input file has not hit
+// EOF) then the frame is passed to the encoder. Otherwise, a NULL
+// is passed, indicating the End-Of-Stream condition to the encoder. The
+// `frame_cnt` is reused as the presentation time stamp (PTS) and each
+// frame is shown for one frame-time in duration. The flags parameter is
+// unused in this example.
+
+// Forced Keyframes
+// ----------------
+// Keyframes can be forced by setting the AOM_EFLAG_FORCE_KF bit of the
+// flags passed to `aom_codec_control()`. In this example, we force a
+// keyframe every <keyframe-interval> frames. Note, the output stream can
+// contain additional keyframes beyond those that have been forced using the
+// AOM_EFLAG_FORCE_KF flag because of automatic keyframe placement by the
+// encoder.
+//
+// Processing The Encoded Data
+// ---------------------------
+// Each packet of type `AOM_CODEC_CX_FRAME_PKT` contains the encoded data
+// for this frame. We write a IVF frame header, followed by the raw data.
+//
+// Cleanup
+// -------
+// The `aom_codec_destroy` call frees any memory allocated by the codec.
+//
+// Error Handling
+// --------------
+// This example does not special case any error return codes. If there was
+// an error, a descriptive message is printed and the program exits. With
+// few exeptions, aom_codec functions return an enumerated error status,
+// with the value `0` indicating success.
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "aom/aom_encoder.h"
+#include "aom/aomcx.h"
+#include "av1/common/enums.h"
+#include "common/tools_common.h"
+#include "common/video_writer.h"
+
+static const char *exec_name;
+
+void usage_exit(void) {
+  fprintf(stderr,
+          "Usage: %s <codec> <width> <height> <infile0> <infile1> "
+          "<outfile> <frames to encode>\n"
+          "See comments in scalable_encoder.c for more information.\n",
+          exec_name);
+  exit(EXIT_FAILURE);
+}
+
+static int encode_frame(aom_codec_ctx_t *codec, aom_image_t *img,
+                        int frame_index, int flags, FILE *outfile) {
+  int got_pkts = 0;
+  aom_codec_iter_t iter = NULL;
+  const aom_codec_cx_pkt_t *pkt = NULL;
+  const aom_codec_err_t res =
+      aom_codec_encode(codec, img, frame_index, 1, flags);
+  if (res != AOM_CODEC_OK) die_codec(codec, "Failed to encode frame");
+
+  while ((pkt = aom_codec_get_cx_data(codec, &iter)) != NULL) {
+    got_pkts = 1;
+
+    if (pkt->kind == AOM_CODEC_CX_FRAME_PKT) {
+      const int keyframe = (pkt->data.frame.flags & AOM_FRAME_IS_KEY) != 0;
+      if (fwrite(pkt->data.frame.buf, 1, pkt->data.frame.sz, outfile) !=
+          pkt->data.frame.sz) {
+        die_codec(codec, "Failed to write compressed frame");
+      }
+      printf(keyframe ? "K" : ".");
+      printf(" %6d\n", (int)pkt->data.frame.sz);
+      fflush(stdout);
+    }
+  }
+
+  return got_pkts;
+}
+
+int main(int argc, char **argv) {
+  FILE *infile0 = NULL;
+  FILE *infile1 = NULL;
+  aom_codec_ctx_t codec;
+  aom_codec_enc_cfg_t cfg;
+  int frame_count = 0;
+  aom_image_t raw0, raw1;
+  aom_codec_err_t res;
+  AvxVideoInfo info;
+  const AvxInterface *encoder = NULL;
+  const int fps = 30;
+  const int bitrate = 200;
+  int keyframe_interval = 0;
+  int max_frames = 0;
+  int frames_encoded = 0;
+  const char *codec_arg = NULL;
+  const char *width_arg = NULL;
+  const char *height_arg = NULL;
+  const char *infile0_arg = NULL;
+  const char *infile1_arg = NULL;
+  const char *outfile_arg = NULL;
+  //  const char *keyframe_interval_arg = NULL;
+  FILE *outfile = NULL;
+
+  exec_name = argv[0];
+
+  // Clear explicitly, as simply assigning "{ 0 }" generates
+  // "missing-field-initializers" warning in some compilers.
+  memset(&info, 0, sizeof(info));
+
+  if (argc != 8) die("Invalid number of arguments");
+
+  codec_arg = argv[1];
+  width_arg = argv[2];
+  height_arg = argv[3];
+  infile0_arg = argv[4];
+  infile1_arg = argv[5];
+  outfile_arg = argv[6];
+  max_frames = (int)strtol(argv[7], NULL, 0);
+
+  encoder = get_aom_encoder_by_name(codec_arg);
+  if (!encoder) die("Unsupported codec.");
+
+  info.codec_fourcc = encoder->fourcc;
+  info.frame_width = (int)strtol(width_arg, NULL, 0);
+  info.frame_height = (int)strtol(height_arg, NULL, 0);
+  info.time_base.numerator = 1;
+  info.time_base.denominator = fps;
+
+  if (info.frame_width <= 0 || info.frame_height <= 0 ||
+      (info.frame_width % 2) != 0 || (info.frame_height % 2) != 0) {
+    die("Invalid frame size: %dx%d", info.frame_width, info.frame_height);
+  }
+
+  if (!aom_img_alloc(&raw0, AOM_IMG_FMT_I420, info.frame_width,
+                     info.frame_height, 1)) {
+    die("Failed to allocate image for layer 0.");
+  }
+  if (!aom_img_alloc(&raw1, AOM_IMG_FMT_I420, info.frame_width,
+                     info.frame_height, 1)) {
+    die("Failed to allocate image for layer 1.");
+  }
+
+  //  keyframe_interval = (int)strtol(keyframe_interval_arg, NULL, 0);
+  keyframe_interval = 100;
+  if (keyframe_interval < 0) die("Invalid keyframe interval value.");
+
+  printf("Using %s\n", aom_codec_iface_name(encoder->codec_interface()));
+
+  res = aom_codec_enc_config_default(encoder->codec_interface(), &cfg, 0);
+  if (res) die_codec(&codec, "Failed to get default codec config.");
+
+  cfg.g_w = info.frame_width;
+  cfg.g_h = info.frame_height;
+  cfg.g_timebase.num = info.time_base.numerator;
+  cfg.g_timebase.den = info.time_base.denominator;
+  cfg.rc_target_bitrate = bitrate;
+  cfg.g_error_resilient = 0;
+  cfg.g_lag_in_frames = 0;
+  cfg.rc_end_usage = AOM_Q;
+  cfg.save_as_annexb = 0;
+
+  outfile = fopen(outfile_arg, "wb");
+  if (!outfile) die("Failed to open %s for writing.", outfile_arg);
+
+  if (!(infile0 = fopen(infile0_arg, "rb")))
+    die("Failed to open %s for reading.", infile0_arg);
+  if (!(infile1 = fopen(infile1_arg, "rb")))
+    die("Failed to open %s for reading.", infile0_arg);
+
+  if (aom_codec_enc_init(&codec, encoder->codec_interface(), &cfg, 0))
+    die_codec(&codec, "Failed to initialize encoder");
+  if (aom_codec_control(&codec, AOME_SET_CPUUSED, 8))
+    die_codec(&codec, "Failed to set cpu to 8");
+
+  if (aom_codec_control(&codec, AV1E_SET_TILE_COLUMNS, 2))
+    die_codec(&codec, "Failed to set tile columns to 2");
+  if (aom_codec_control(&codec, AV1E_SET_NUM_TG, 3))
+    die_codec(&codec, "Failed to set num of tile groups to 3");
+
+  if (aom_codec_control(&codec, AOME_SET_NUMBER_SPATIAL_LAYERS, 2))
+    die_codec(&codec, "Failed to set number of spatial layers to 2");
+
+  // Encode frames.
+  while (aom_img_read(&raw0, infile0)) {
+    int flags = 0;
+
+    // configure and encode base layer
+
+    if (keyframe_interval > 0 && frames_encoded % keyframe_interval == 0)
+      flags |= AOM_EFLAG_FORCE_KF;
+    else
+      // use previous base layer (LAST) as sole reference
+      // save this frame as LAST to be used as reference by enhanmcent layer
+      // and next base layer
+      flags |= AOM_EFLAG_NO_REF_LAST2 | AOM_EFLAG_NO_REF_LAST3 |
+               AOM_EFLAG_NO_REF_GF | AOM_EFLAG_NO_REF_ARF |
+               AOM_EFLAG_NO_REF_BWD | AOM_EFLAG_NO_REF_ARF2 |
+               AOM_EFLAG_NO_UPD_GF | AOM_EFLAG_NO_UPD_ARF |
+               AOM_EFLAG_NO_UPD_ENTROPY;
+    cfg.g_w = info.frame_width;
+    cfg.g_h = info.frame_height;
+    if (aom_codec_enc_config_set(&codec, &cfg))
+      die_codec(&codec, "Failed to set enc cfg for layer 0");
+    if (aom_codec_control(&codec, AOME_SET_SPATIAL_LAYER_ID, 0))
+      die_codec(&codec, "Failed to set layer id to 0");
+    if (aom_codec_control(&codec, AOME_SET_CQ_LEVEL, 62))
+      die_codec(&codec, "Failed to set cq level");
+    encode_frame(&codec, &raw0, frame_count++, flags, outfile);
+
+    // configure and encode enhancement layer
+
+    //  use LAST (base layer) as sole reference
+    flags = AOM_EFLAG_NO_REF_LAST2 | AOM_EFLAG_NO_REF_LAST3 |
+            AOM_EFLAG_NO_REF_GF | AOM_EFLAG_NO_REF_ARF | AOM_EFLAG_NO_REF_BWD |
+            AOM_EFLAG_NO_REF_ARF2 | AOM_EFLAG_NO_UPD_LAST |
+            AOM_EFLAG_NO_UPD_GF | AOM_EFLAG_NO_UPD_ARF |
+            AOM_EFLAG_NO_UPD_ENTROPY;
+    cfg.g_w = info.frame_width;
+    cfg.g_h = info.frame_height;
+    aom_img_read(&raw1, infile1);
+    if (aom_codec_enc_config_set(&codec, &cfg))
+      die_codec(&codec, "Failed to set enc cfg for layer 1");
+    if (aom_codec_control(&codec, AOME_SET_SPATIAL_LAYER_ID, 1))
+      die_codec(&codec, "Failed to set layer id to 1");
+    if (aom_codec_control(&codec, AOME_SET_CQ_LEVEL, 10))
+      die_codec(&codec, "Failed to set cq level");
+    encode_frame(&codec, &raw1, frame_count++, flags, outfile);
+
+    frames_encoded++;
+
+    if (max_frames > 0 && frames_encoded >= max_frames) break;
+  }
+
+  // Flush encoder.
+  while (encode_frame(&codec, NULL, -1, 0, outfile)) continue;
+
+  printf("\n");
+  fclose(infile0);
+  fclose(infile1);
+  printf("Processed %d frames.\n", frame_count / 2);
+
+  aom_img_free(&raw0);
+  aom_img_free(&raw1);
+  if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec.");
+
+  fclose(outfile);
+
+  return EXIT_SUCCESS;
+}
diff --git a/libs/libaom/src/examples/set_maps.c b/libs/libaom/src/examples/set_maps.c
new file mode 100644
index 000000000..9aeb96e43
--- /dev/null
+++ b/libs/libaom/src/examples/set_maps.c
@@ -0,0 +1,208 @@
+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+// AOM Set Active and ROI Maps
+// ===========================
+//
+// This is an example demonstrating how to control the AOM encoder's
+// ROI and Active maps.
+//
+// ROI (Reigon of Interest) maps are a way for the application to assign
+// each macroblock in the image to a region, and then set quantizer and
+// filtering parameters on that image.
+//
+// Active maps are a way for the application to specify on a
+// macroblock-by-macroblock basis whether there is any activity in that
+// macroblock.
+//
+//
+// Configuration
+// -------------
+// An ROI map is set on frame 22. If the width of the image in macroblocks
+// is evenly divisble by 4, then the output will appear to have distinct
+// columns, where the quantizer, loopfilter, and static threshold differ
+// from column to column.
+//
+// An active map is set on frame 33. If the width of the image in macroblocks
+// is evenly divisble by 4, then the output will appear to have distinct
+// columns, where one column will have motion and the next will not.
+//
+// The active map is cleared on frame 44.
+//
+// Observing The Effects
+// ---------------------
+// Use the `simple_decoder` example to decode this sample, and observe
+// the change in the image at frames 22, 33, and 44.
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "aom/aom_encoder.h"
+#include "aom/aomcx.h"
+#include "common/tools_common.h"
+#include "common/video_writer.h"
+
+static const char *exec_name;
+
+void usage_exit(void) {
+  fprintf(stderr, "Usage: %s <codec> <width> <height> <infile> <outfile>\n",
+          exec_name);
+  exit(EXIT_FAILURE);
+}
+
+static void set_active_map(const aom_codec_enc_cfg_t *cfg,
+                           aom_codec_ctx_t *codec) {
+  unsigned int i;
+  aom_active_map_t map = { 0, 0, 0 };
+
+  map.rows = (cfg->g_h + 15) / 16;
+  map.cols = (cfg->g_w + 15) / 16;
+
+  map.active_map = (uint8_t *)malloc(map.rows * map.cols);
+  for (i = 0; i < map.rows * map.cols; ++i) map.active_map[i] = i % 2;
+
+  if (aom_codec_control(codec, AOME_SET_ACTIVEMAP, &map))
+    die_codec(codec, "Failed to set active map");
+
+  free(map.active_map);
+}
+
+static void unset_active_map(const aom_codec_enc_cfg_t *cfg,
+                             aom_codec_ctx_t *codec) {
+  aom_active_map_t map = { 0, 0, 0 };
+
+  map.rows = (cfg->g_h + 15) / 16;
+  map.cols = (cfg->g_w + 15) / 16;
+  map.active_map = NULL;
+
+  if (aom_codec_control(codec, AOME_SET_ACTIVEMAP, &map))
+    die_codec(codec, "Failed to set active map");
+}
+
+static int encode_frame(aom_codec_ctx_t *codec, aom_image_t *img,
+                        int frame_index, AvxVideoWriter *writer) {
+  int got_pkts = 0;
+  aom_codec_iter_t iter = NULL;
+  const aom_codec_cx_pkt_t *pkt = NULL;
+  const aom_codec_err_t res = aom_codec_encode(codec, img, frame_index, 1, 0);
+  if (res != AOM_CODEC_OK) die_codec(codec, "Failed to encode frame");
+
+  while ((pkt = aom_codec_get_cx_data(codec, &iter)) != NULL) {
+    got_pkts = 1;
+
+    if (pkt->kind == AOM_CODEC_CX_FRAME_PKT) {
+      const int keyframe = (pkt->data.frame.flags & AOM_FRAME_IS_KEY) != 0;
+      if (!aom_video_writer_write_frame(writer, pkt->data.frame.buf,
+                                        pkt->data.frame.sz,
+                                        pkt->data.frame.pts)) {
+        die_codec(codec, "Failed to write compressed frame");
+      }
+
+      printf(keyframe ? "K" : ".");
+      fflush(stdout);
+    }
+  }
+
+  return got_pkts;
+}
+
+int main(int argc, char **argv) {
+  FILE *infile = NULL;
+  aom_codec_ctx_t codec;
+  aom_codec_enc_cfg_t cfg;
+  int frame_count = 0;
+  const int limit = 15;
+  aom_image_t raw;
+  aom_codec_err_t res;
+  AvxVideoInfo info;
+  AvxVideoWriter *writer = NULL;
+  const AvxInterface *encoder = NULL;
+  const int fps = 2;  // TODO(dkovalev) add command line argument
+  const double bits_per_pixel_per_frame = 0.067;
+
+  exec_name = argv[0];
+  if (argc != 6) die("Invalid number of arguments");
+
+  memset(&info, 0, sizeof(info));
+
+  encoder = get_aom_encoder_by_name(argv[1]);
+  if (encoder == NULL) {
+    die("Unsupported codec.");
+  }
+  assert(encoder != NULL);
+  info.codec_fourcc = encoder->fourcc;
+  info.frame_width = (int)strtol(argv[2], NULL, 0);
+  info.frame_height = (int)strtol(argv[3], NULL, 0);
+  info.time_base.numerator = 1;
+  info.time_base.denominator = fps;
+
+  if (info.frame_width <= 0 || info.frame_height <= 0 ||
+      (info.frame_width % 2) != 0 || (info.frame_height % 2) != 0) {
+    die("Invalid frame size: %dx%d", info.frame_width, info.frame_height);
+  }
+
+  if (!aom_img_alloc(&raw, AOM_IMG_FMT_I420, info.frame_width,
+                     info.frame_height, 1)) {
+    die("Failed to allocate image.");
+  }
+
+  printf("Using %s\n", aom_codec_iface_name(encoder->codec_interface()));
+
+  res = aom_codec_enc_config_default(encoder->codec_interface(), &cfg, 0);
+  if (res) die_codec(&codec, "Failed to get default codec config.");
+
+  cfg.g_w = info.frame_width;
+  cfg.g_h = info.frame_height;
+  cfg.g_timebase.num = info.time_base.numerator;
+  cfg.g_timebase.den = info.time_base.denominator;
+  cfg.rc_target_bitrate =
+      (unsigned int)(bits_per_pixel_per_frame * cfg.g_w * cfg.g_h * fps / 1000);
+  cfg.g_lag_in_frames = 0;
+
+  writer = aom_video_writer_open(argv[5], kContainerIVF, &info);
+  if (!writer) die("Failed to open %s for writing.", argv[5]);
+
+  if (!(infile = fopen(argv[4], "rb")))
+    die("Failed to open %s for reading.", argv[4]);
+
+  if (aom_codec_enc_init(&codec, encoder->codec_interface(), &cfg, 0))
+    die_codec(&codec, "Failed to initialize encoder");
+
+  // Encode frames.
+  while (aom_img_read(&raw, infile) && frame_count < limit) {
+    ++frame_count;
+
+    if (frame_count == 5) {
+      set_active_map(&cfg, &codec);
+    } else if (frame_count == 11) {
+      unset_active_map(&cfg, &codec);
+    }
+
+    encode_frame(&codec, &raw, frame_count, writer);
+  }
+
+  // Flush encoder.
+  while (encode_frame(&codec, NULL, -1, writer)) {
+  }
+
+  printf("\n");
+  fclose(infile);
+  printf("Processed %d frames.\n", frame_count);
+
+  aom_img_free(&raw);
+  if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec.");
+
+  aom_video_writer_close(writer);
+
+  return EXIT_SUCCESS;
+}
diff --git a/libs/libaom/src/examples/simple_decoder.c b/libs/libaom/src/examples/simple_decoder.c
new file mode 100644
index 000000000..d098d1e0b
--- /dev/null
+++ b/libs/libaom/src/examples/simple_decoder.c
@@ -0,0 +1,146 @@
+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+// Simple Decoder
+// ==============
+//
+// This is an example of a simple decoder loop. It takes an input file
+// containing the compressed data (in IVF format), passes it through the
+// decoder, and writes the decompressed frames to disk. Other decoder
+// examples build upon this one.
+//
+// The details of the IVF format have been elided from this example for
+// simplicity of presentation, as IVF files will not generally be used by
+// your application. In general, an IVF file consists of a file header,
+// followed by a variable number of frames. Each frame consists of a frame
+// header followed by a variable length payload. The length of the payload
+// is specified in the first four bytes of the frame header. The payload is
+// the raw compressed data.
+//
+// Standard Includes
+// -----------------
+// For decoders, you only have to include `aom_decoder.h` and then any
+// header files for the specific codecs you use. In this case, we're using
+// aom.
+//
+// Initializing The Codec
+// ----------------------
+// The libaom decoder is initialized by the call to aom_codec_dec_init().
+// Determining the codec interface to use is handled by AvxVideoReader and the
+// functions prefixed with aom_video_reader_. Discussion of those functions is
+// beyond the scope of this example, but the main gist is to open the input file
+// and parse just enough of it to determine if it's a AVx file and which AVx
+// codec is contained within the file.
+// Note the NULL pointer passed to aom_codec_dec_init(). We do that in this
+// example because we want the algorithm to determine the stream configuration
+// (width/height) and allocate memory automatically.
+//
+// Decoding A Frame
+// ----------------
+// Once the frame has been read into memory, it is decoded using the
+// `aom_codec_decode` function. The call takes a pointer to the data
+// (`frame`) and the length of the data (`frame_size`). No application data
+// is associated with the frame in this example, so the `user_priv`
+// parameter is NULL.
+//
+// Codecs may produce a variable number of output frames for every call to
+// `aom_codec_decode`. These frames are retrieved by the
+// `aom_codec_get_frame` iterator function. The iterator variable `iter` is
+// initialized to NULL each time `aom_codec_decode` is called.
+// `aom_codec_get_frame` is called in a loop, returning a pointer to a
+// decoded image or NULL to indicate the end of list.
+//
+// Processing The Decoded Data
+// ---------------------------
+// In this example, we simply write the encoded data to disk. It is
+// important to honor the image's `stride` values.
+//
+// Cleanup
+// -------
+// The `aom_codec_destroy` call frees any memory allocated by the codec.
+//
+// Error Handling
+// --------------
+// This example does not special case any error return codes. If there was
+// an error, a descriptive message is printed and the program exits. With
+// few exceptions, aom_codec functions return an enumerated error status,
+// with the value `0` indicating success.
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "aom/aom_decoder.h"
+#include "common/tools_common.h"
+#include "common/video_reader.h"
+
+static const char *exec_name;
+
+void usage_exit(void) {
+  fprintf(stderr, "Usage: %s <infile> <outfile>\n", exec_name);
+  exit(EXIT_FAILURE);
+}
+
+int main(int argc, char **argv) {
+  int frame_cnt = 0;
+  FILE *outfile = NULL;
+  aom_codec_ctx_t codec;
+  AvxVideoReader *reader = NULL;
+  const AvxInterface *decoder = NULL;
+  const AvxVideoInfo *info = NULL;
+
+  exec_name = argv[0];
+
+  if (argc != 3) die("Invalid number of arguments.");
+
+  reader = aom_video_reader_open(argv[1]);
+  if (!reader) die("Failed to open %s for reading.", argv[1]);
+
+  if (!(outfile = fopen(argv[2], "wb")))
+    die("Failed to open %s for writing.", argv[2]);
+
+  info = aom_video_reader_get_info(reader);
+
+  decoder = get_aom_decoder_by_fourcc(info->codec_fourcc);
+  if (!decoder) die("Unknown input codec.");
+
+  printf("Using %s\n", aom_codec_iface_name(decoder->codec_interface()));
+
+  if (aom_codec_dec_init(&codec, decoder->codec_interface(), NULL, 0))
+    die_codec(&codec, "Failed to initialize decoder.");
+
+  while (aom_video_reader_read_frame(reader)) {
+    aom_codec_iter_t iter = NULL;
+    aom_image_t *img = NULL;
+    size_t frame_size = 0;
+    const unsigned char *frame =
+        aom_video_reader_get_frame(reader, &frame_size);
+    if (aom_codec_decode(&codec, frame, frame_size, NULL))
+      die_codec(&codec, "Failed to decode frame.");
+
+    while ((img = aom_codec_get_frame(&codec, &iter)) != NULL) {
+      aom_img_write(img, outfile);
+      ++frame_cnt;
+    }
+  }
+
+  printf("Processed %d frames.\n", frame_cnt);
+  if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec");
+
+  printf("Play: ffplay -f rawvideo -pix_fmt yuv420p -s %dx%d %s\n",
+         info->frame_width, info->frame_height, argv[2]);
+
+  aom_video_reader_close(reader);
+
+  fclose(outfile);
+
+  return EXIT_SUCCESS;
+}
diff --git a/libs/libaom/src/examples/simple_encoder.c b/libs/libaom/src/examples/simple_encoder.c
new file mode 100644
index 000000000..01a37cf0c
--- /dev/null
+++ b/libs/libaom/src/examples/simple_encoder.c
@@ -0,0 +1,249 @@
+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+// Simple Encoder
+// ==============
+//
+// This is an example of a simple encoder loop. It takes an input file in
+// YV12 format, passes it through the encoder, and writes the compressed
+// frames to disk in IVF format. Other decoder examples build upon this
+// one.
+//
+// The details of the IVF format have been elided from this example for
+// simplicity of presentation, as IVF files will not generally be used by
+// your application. In general, an IVF file consists of a file header,
+// followed by a variable number of frames. Each frame consists of a frame
+// header followed by a variable length payload. The length of the payload
+// is specified in the first four bytes of the frame header. The payload is
+// the raw compressed data.
+//
+// Standard Includes
+// -----------------
+// For encoders, you only have to include `aom_encoder.h` and then any
+// header files for the specific codecs you use. In this case, we're using
+// aom.
+//
+// Getting The Default Configuration
+// ---------------------------------
+// Encoders have the notion of "usage profiles." For example, an encoder
+// may want to publish default configurations for both a video
+// conferencing application and a best quality offline encoder. These
+// obviously have very different default settings. Consult the
+// documentation for your codec to see if it provides any default
+// configurations. All codecs provide a default configuration, number 0,
+// which is valid for material in the vacinity of QCIF/QVGA.
+//
+// Updating The Configuration
+// ---------------------------------
+// Almost all applications will want to update the default configuration
+// with settings specific to their usage. Here we set the width and height
+// of the video file to that specified on the command line. We also scale
+// the default bitrate based on the ratio between the default resolution
+// and the resolution specified on the command line.
+//
+// Initializing The Codec
+// ----------------------
+// The encoder is initialized by the following code.
+//
+// Encoding A Frame
+// ----------------
+// The frame is read as a continuous block (size width * height * 3 / 2)
+// from the input file. If a frame was read (the input file has not hit
+// EOF) then the frame is passed to the encoder. Otherwise, a NULL
+// is passed, indicating the End-Of-Stream condition to the encoder. The
+// `frame_cnt` is reused as the presentation time stamp (PTS) and each
+// frame is shown for one frame-time in duration. The flags parameter is
+// unused in this example.
+
+// Forced Keyframes
+// ----------------
+// Keyframes can be forced by setting the AOM_EFLAG_FORCE_KF bit of the
+// flags passed to `aom_codec_control()`. In this example, we force a
+// keyframe every <keyframe-interval> frames. Note, the output stream can
+// contain additional keyframes beyond those that have been forced using the
+// AOM_EFLAG_FORCE_KF flag because of automatic keyframe placement by the
+// encoder.
+//
+// Processing The Encoded Data
+// ---------------------------
+// Each packet of type `AOM_CODEC_CX_FRAME_PKT` contains the encoded data
+// for this frame. We write a IVF frame header, followed by the raw data.
+//
+// Cleanup
+// -------
+// The `aom_codec_destroy` call frees any memory allocated by the codec.
+//
+// Error Handling
+// --------------
+// This example does not special case any error return codes. If there was
+// an error, a descriptive message is printed and the program exits. With
+// few exeptions, aom_codec functions return an enumerated error status,
+// with the value `0` indicating success.
+//
+// Error Resiliency Features
+// -------------------------
+// Error resiliency is controlled by the g_error_resilient member of the
+// configuration structure. Use the `decode_with_drops` example to decode with
+// frames 5-10 dropped. Compare the output for a file encoded with this example
+// versus one encoded with the `simple_encoder` example.
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "aom/aom_encoder.h"
+#include "common/tools_common.h"
+#include "common/video_writer.h"
+
+static const char *exec_name;
+
+void usage_exit(void) {
+  fprintf(stderr,
+          "Usage: %s <codec> <width> <height> <infile> <outfile> "
+          "<keyframe-interval> <error-resilient> <frames to encode>\n"
+          "See comments in simple_encoder.c for more information.\n",
+          exec_name);
+  exit(EXIT_FAILURE);
+}
+
+static int encode_frame(aom_codec_ctx_t *codec, aom_image_t *img,
+                        int frame_index, int flags, AvxVideoWriter *writer) {
+  int got_pkts = 0;
+  aom_codec_iter_t iter = NULL;
+  const aom_codec_cx_pkt_t *pkt = NULL;
+  const aom_codec_err_t res =
+      aom_codec_encode(codec, img, frame_index, 1, flags);
+  if (res != AOM_CODEC_OK) die_codec(codec, "Failed to encode frame");
+
+  while ((pkt = aom_codec_get_cx_data(codec, &iter)) != NULL) {
+    got_pkts = 1;
+
+    if (pkt->kind == AOM_CODEC_CX_FRAME_PKT) {
+      const int keyframe = (pkt->data.frame.flags & AOM_FRAME_IS_KEY) != 0;
+      if (!aom_video_writer_write_frame(writer, pkt->data.frame.buf,
+                                        pkt->data.frame.sz,
+                                        pkt->data.frame.pts)) {
+        die_codec(codec, "Failed to write compressed frame");
+      }
+      printf(keyframe ? "K" : ".");
+      fflush(stdout);
+    }
+  }
+
+  return got_pkts;
+}
+
+// TODO(tomfinegan): Improve command line parsing and add args for bitrate/fps.
+int main(int argc, char **argv) {
+  FILE *infile = NULL;
+  aom_codec_ctx_t codec;
+  aom_codec_enc_cfg_t cfg;
+  int frame_count = 0;
+  aom_image_t raw;
+  aom_codec_err_t res;
+  AvxVideoInfo info;
+  AvxVideoWriter *writer = NULL;
+  const AvxInterface *encoder = NULL;
+  const int fps = 30;
+  const int bitrate = 200;
+  int keyframe_interval = 0;
+  int max_frames = 0;
+  int frames_encoded = 0;
+  const char *codec_arg = NULL;
+  const char *width_arg = NULL;
+  const char *height_arg = NULL;
+  const char *infile_arg = NULL;
+  const char *outfile_arg = NULL;
+  const char *keyframe_interval_arg = NULL;
+
+  exec_name = argv[0];
+
+  // Clear explicitly, as simply assigning "{ 0 }" generates
+  // "missing-field-initializers" warning in some compilers.
+  memset(&info, 0, sizeof(info));
+
+  if (argc != 9) die("Invalid number of arguments");
+
+  codec_arg = argv[1];
+  width_arg = argv[2];
+  height_arg = argv[3];
+  infile_arg = argv[4];
+  outfile_arg = argv[5];
+  keyframe_interval_arg = argv[6];
+  max_frames = (int)strtol(argv[8], NULL, 0);
+
+  encoder = get_aom_encoder_by_name(codec_arg);
+  if (!encoder) die("Unsupported codec.");
+
+  info.codec_fourcc = encoder->fourcc;
+  info.frame_width = (int)strtol(width_arg, NULL, 0);
+  info.frame_height = (int)strtol(height_arg, NULL, 0);
+  info.time_base.numerator = 1;
+  info.time_base.denominator = fps;
+
+  if (info.frame_width <= 0 || info.frame_height <= 0 ||
+      (info.frame_width % 2) != 0 || (info.frame_height % 2) != 0) {
+    die("Invalid frame size: %dx%d", info.frame_width, info.frame_height);
+  }
+
+  if (!aom_img_alloc(&raw, AOM_IMG_FMT_I420, info.frame_width,
+                     info.frame_height, 1)) {
+    die("Failed to allocate image.");
+  }
+
+  keyframe_interval = (int)strtol(keyframe_interval_arg, NULL, 0);
+  if (keyframe_interval < 0) die("Invalid keyframe interval value.");
+
+  printf("Using %s\n", aom_codec_iface_name(encoder->codec_interface()));
+
+  res = aom_codec_enc_config_default(encoder->codec_interface(), &cfg, 0);
+  if (res) die_codec(&codec, "Failed to get default codec config.");
+
+  cfg.g_w = info.frame_width;
+  cfg.g_h = info.frame_height;
+  cfg.g_timebase.num = info.time_base.numerator;
+  cfg.g_timebase.den = info.time_base.denominator;
+  cfg.rc_target_bitrate = bitrate;
+  cfg.g_error_resilient = (aom_codec_er_flags_t)strtoul(argv[7], NULL, 0);
+
+  writer = aom_video_writer_open(outfile_arg, kContainerIVF, &info);
+  if (!writer) die("Failed to open %s for writing.", outfile_arg);
+
+  if (!(infile = fopen(infile_arg, "rb")))
+    die("Failed to open %s for reading.", infile_arg);
+
+  if (aom_codec_enc_init(&codec, encoder->codec_interface(), &cfg, 0))
+    die_codec(&codec, "Failed to initialize encoder");
+
+  // Encode frames.
+  while (aom_img_read(&raw, infile)) {
+    int flags = 0;
+    if (keyframe_interval > 0 && frame_count % keyframe_interval == 0)
+      flags |= AOM_EFLAG_FORCE_KF;
+    encode_frame(&codec, &raw, frame_count++, flags, writer);
+    frames_encoded++;
+    if (max_frames > 0 && frames_encoded >= max_frames) break;
+  }
+
+  // Flush encoder.
+  while (encode_frame(&codec, NULL, -1, 0, writer)) continue;
+
+  printf("\n");
+  fclose(infile);
+  printf("Processed %d frames.\n", frame_count);
+
+  aom_img_free(&raw);
+  if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec.");
+
+  aom_video_writer_close(writer);
+
+  return EXIT_SUCCESS;
+}
diff --git a/libs/libaom/src/examples/svc_encoder_rtc.c b/libs/libaom/src/examples/svc_encoder_rtc.c
new file mode 100644
index 000000000..1316c6c1e
--- /dev/null
+++ b/libs/libaom/src/examples/svc_encoder_rtc.c
@@ -0,0 +1,907 @@
+/*
+ *  Copyright (c) 2019, Alliance for Open Media. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+//  This is an example demonstrating how to implement a multi-layer AOM
+//  encoding scheme for RTC video applications.
+
+#include <assert.h>
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "aom/aom_encoder.h"
+#include "aom/aomcx.h"
+#include "av1/common/enums.h"
+#include "common/tools_common.h"
+#include "common/video_writer.h"
+#include "aom_ports/aom_timer.h"
+
+#define zero(Dest) memset(&(Dest), 0, sizeof(Dest));
+
+static const char *exec_name;
+
+void usage_exit(void) { exit(EXIT_FAILURE); }
+
+static int mode_to_num_temporal_layers[10] = { 1, 2, 3, 3, 2, 1, 1, 3, 3, 3 };
+static int mode_to_num_spatial_layers[10] = { 1, 1, 1, 1, 1, 2, 3, 3, 3, 3 };
+static int mode_to_num_layers[10] = { 1, 2, 3, 3, 2, 2, 3, 9, 9, 9 };
+
+// For rate control encoding stats.
+struct RateControlMetrics {
+  // Number of input frames per layer.
+  int layer_input_frames[AOM_MAX_TS_LAYERS];
+  // Number of encoded non-key frames per layer.
+  int layer_enc_frames[AOM_MAX_TS_LAYERS];
+  // Framerate per layer layer (cumulative).
+  double layer_framerate[AOM_MAX_TS_LAYERS];
+  // Target average frame size per layer (per-frame-bandwidth per layer).
+  double layer_pfb[AOM_MAX_LAYERS];
+  // Actual average frame size per layer.
+  double layer_avg_frame_size[AOM_MAX_LAYERS];
+  // Average rate mismatch per layer (|target - actual| / target).
+  double layer_avg_rate_mismatch[AOM_MAX_LAYERS];
+  // Actual encoding bitrate per layer (cumulative across temporal layers).
+  double layer_encoding_bitrate[AOM_MAX_LAYERS];
+  // Average of the short-time encoder actual bitrate.
+  // TODO(marpan): Should we add these short-time stats for each layer?
+  double avg_st_encoding_bitrate;
+  // Variance of the short-time encoder actual bitrate.
+  double variance_st_encoding_bitrate;
+  // Window (number of frames) for computing short-timee encoding bitrate.
+  int window_size;
+  // Number of window measurements.
+  int window_count;
+  int layer_target_bitrate[AOM_MAX_LAYERS];
+};
+
+static int read_frame(struct AvxInputContext *input_ctx, aom_image_t *img) {
+  FILE *f = input_ctx->file;
+  y4m_input *y4m = &input_ctx->y4m;
+  int shortread = 0;
+
+  if (input_ctx->file_type == FILE_TYPE_Y4M) {
+    if (y4m_input_fetch_frame(y4m, f, img) < 1) return 0;
+  } else {
+    shortread = read_yuv_frame(input_ctx, img);
+  }
+
+  return !shortread;
+}
+
+static int file_is_y4m(const char detect[4]) {
+  if (memcmp(detect, "YUV4", 4) == 0) {
+    return 1;
+  }
+  return 0;
+}
+
+static int fourcc_is_ivf(const char detect[4]) {
+  if (memcmp(detect, "DKIF", 4) == 0) {
+    return 1;
+  }
+  return 0;
+}
+
+static void close_input_file(struct AvxInputContext *input) {
+  fclose(input->file);
+  if (input->file_type == FILE_TYPE_Y4M) y4m_input_close(&input->y4m);
+}
+
+static void open_input_file(struct AvxInputContext *input,
+                            aom_chroma_sample_position_t csp) {
+  /* Parse certain options from the input file, if possible */
+  input->file = strcmp(input->filename, "-") ? fopen(input->filename, "rb")
+                                             : set_binary_mode(stdin);
+
+  if (!input->file) fatal("Failed to open input file");
+
+  if (!fseeko(input->file, 0, SEEK_END)) {
+    /* Input file is seekable. Figure out how long it is, so we can get
+     * progress info.
+     */
+    input->length = ftello(input->file);
+    rewind(input->file);
+  }
+
+  /* Default to 1:1 pixel aspect ratio. */
+  input->pixel_aspect_ratio.numerator = 1;
+  input->pixel_aspect_ratio.denominator = 1;
+
+  /* For RAW input sources, these bytes will applied on the first frame
+   *  in read_frame().
+   */
+  input->detect.buf_read = fread(input->detect.buf, 1, 4, input->file);
+  input->detect.position = 0;
+
+  if (input->detect.buf_read == 4 && file_is_y4m(input->detect.buf)) {
+    if (y4m_input_open(&input->y4m, input->file, input->detect.buf, 4, csp,
+                       input->only_i420) >= 0) {
+      input->file_type = FILE_TYPE_Y4M;
+      input->width = input->y4m.pic_w;
+      input->height = input->y4m.pic_h;
+      input->pixel_aspect_ratio.numerator = input->y4m.par_n;
+      input->pixel_aspect_ratio.denominator = input->y4m.par_d;
+      input->framerate.numerator = input->y4m.fps_n;
+      input->framerate.denominator = input->y4m.fps_d;
+      input->fmt = input->y4m.aom_fmt;
+      input->bit_depth = input->y4m.bit_depth;
+    } else {
+      fatal("Unsupported Y4M stream.");
+    }
+  } else if (input->detect.buf_read == 4 && fourcc_is_ivf(input->detect.buf)) {
+    fatal("IVF is not supported as input.");
+  } else {
+    input->file_type = FILE_TYPE_RAW;
+  }
+}
+
+// Note: these rate control metrics assume only 1 key frame in the
+// sequence (i.e., first frame only). So for temporal pattern# 7
+// (which has key frame for every frame on base layer), the metrics
+// computation will be off/wrong.
+// TODO(marpan): Update these metrics to account for multiple key frames
+// in the stream.
+static void set_rate_control_metrics(struct RateControlMetrics *rc,
+                                     double framerate,
+                                     unsigned int ss_number_layers,
+                                     unsigned int ts_number_layers) {
+  int ts_rate_decimator[AOM_MAX_TS_LAYERS] = { 1 };
+  ts_rate_decimator[0] = 1;
+  if (ts_number_layers == 2) {
+    ts_rate_decimator[0] = 2;
+    ts_rate_decimator[1] = 1;
+  }
+  if (ts_number_layers == 3) {
+    ts_rate_decimator[0] = 4;
+    ts_rate_decimator[1] = 2;
+    ts_rate_decimator[2] = 1;
+  }
+  // Set the layer (cumulative) framerate and the target layer (non-cumulative)
+  // per-frame-bandwidth, for the rate control encoding stats below.
+  for (unsigned int sl = 0; sl < ss_number_layers; ++sl) {
+    unsigned int i = sl * ts_number_layers;
+    rc->layer_framerate[0] = framerate / ts_rate_decimator[0];
+    rc->layer_pfb[i] =
+        1000.0 * rc->layer_target_bitrate[i] / rc->layer_framerate[0];
+    for (unsigned int tl = 0; tl < ts_number_layers; ++tl) {
+      i = sl * ts_number_layers + tl;
+      if (tl > 0) {
+        rc->layer_framerate[tl] = framerate / ts_rate_decimator[tl];
+        rc->layer_pfb[i] =
+            1000.0 *
+            (rc->layer_target_bitrate[i] - rc->layer_target_bitrate[i - 1]) /
+            (rc->layer_framerate[tl] - rc->layer_framerate[tl - 1]);
+      }
+      rc->layer_input_frames[tl] = 0;
+      rc->layer_enc_frames[tl] = 0;
+      rc->layer_encoding_bitrate[i] = 0.0;
+      rc->layer_avg_frame_size[i] = 0.0;
+      rc->layer_avg_rate_mismatch[i] = 0.0;
+    }
+  }
+  rc->window_count = 0;
+  rc->window_size = 15;
+  rc->avg_st_encoding_bitrate = 0.0;
+  rc->variance_st_encoding_bitrate = 0.0;
+}
+
+static void printout_rate_control_summary(struct RateControlMetrics *rc,
+                                          int frame_cnt,
+                                          unsigned int ss_number_layers,
+                                          unsigned int ts_number_layers) {
+  int tot_num_frames = 0;
+  double perc_fluctuation = 0.0;
+  printf("Total number of processed frames: %d\n\n", frame_cnt - 1);
+  printf("Rate control layer stats for %d layer(s):\n\n", ts_number_layers);
+  for (unsigned int sl = 0; sl < ss_number_layers; ++sl) {
+    tot_num_frames = 0;
+    for (unsigned int tl = 0; tl < ts_number_layers; ++tl) {
+      unsigned int i = sl * ts_number_layers + tl;
+      const int num_dropped =
+          tl > 0 ? rc->layer_input_frames[tl] - rc->layer_enc_frames[tl]
+                 : rc->layer_input_frames[tl] - rc->layer_enc_frames[tl] - 1;
+      tot_num_frames += rc->layer_input_frames[tl];
+      rc->layer_encoding_bitrate[i] = 0.001 * rc->layer_framerate[tl] *
+                                      rc->layer_encoding_bitrate[i] /
+                                      tot_num_frames;
+      rc->layer_avg_frame_size[i] =
+          rc->layer_avg_frame_size[i] / rc->layer_enc_frames[tl];
+      rc->layer_avg_rate_mismatch[i] =
+          100.0 * rc->layer_avg_rate_mismatch[i] / rc->layer_enc_frames[tl];
+      printf("For layer#: %d %d \n", sl, tl);
+      printf("Bitrate (target vs actual): %d %f\n", rc->layer_target_bitrate[i],
+             rc->layer_encoding_bitrate[i]);
+      printf("Average frame size (target vs actual): %f %f\n", rc->layer_pfb[i],
+             rc->layer_avg_frame_size[i]);
+      printf("Average rate_mismatch: %f\n", rc->layer_avg_rate_mismatch[i]);
+      printf(
+          "Number of input frames, encoded (non-key) frames, "
+          "and perc dropped frames: %d %d %f\n",
+          rc->layer_input_frames[tl], rc->layer_enc_frames[tl],
+          100.0 * num_dropped / rc->layer_input_frames[tl]);
+      printf("\n");
+    }
+  }
+  rc->avg_st_encoding_bitrate = rc->avg_st_encoding_bitrate / rc->window_count;
+  rc->variance_st_encoding_bitrate =
+      rc->variance_st_encoding_bitrate / rc->window_count -
+      (rc->avg_st_encoding_bitrate * rc->avg_st_encoding_bitrate);
+  perc_fluctuation = 100.0 * sqrt(rc->variance_st_encoding_bitrate) /
+                     rc->avg_st_encoding_bitrate;
+  printf("Short-time stats, for window of %d frames:\n", rc->window_size);
+  printf("Average, rms-variance, and percent-fluct: %f %f %f\n",
+         rc->avg_st_encoding_bitrate, sqrt(rc->variance_st_encoding_bitrate),
+         perc_fluctuation);
+  if (frame_cnt - 1 != tot_num_frames)
+    die("Error: Number of input frames not equal to output!\n");
+}
+
+// Layer pattern configuration.
+static int set_layer_pattern(int layering_mode, int superframe_cnt,
+                             aom_svc_layer_id_t *layer_id,
+                             aom_svc_ref_frame_config_t *ref_frame_config,
+                             int *use_svc_control, int spatial_layer_id,
+                             int is_key_frame, int ksvc_mode) {
+  int i;
+  int shift = (layering_mode == 7) ? 2 : 0;
+  *use_svc_control = 1;
+  layer_id->spatial_layer_id = spatial_layer_id;
+  // Set the referende map buffer idx for the 7 references:
+  // LAST_FRAME (0), LAST2_FRAME(1), LAST3_FRAME(2), GOLDEN_FRAME(3),
+  // BWDREF_FRAME(4), ALTREF2_FRAME(5), ALTREF_FRAME(6).
+  for (i = 0; i < INTER_REFS_PER_FRAME; i++) ref_frame_config->ref_idx[i] = i;
+  for (i = 0; i < INTER_REFS_PER_FRAME; i++) ref_frame_config->reference[i] = 0;
+  for (i = 0; i < REF_FRAMES; i++) ref_frame_config->refresh[i] = 0;
+  // Note for this layered patterns only use LAST and GF for prediction in
+  // non-rd mode (speed >= 7).
+  int layer_flags = AOM_EFLAG_NO_REF_LAST2 | AOM_EFLAG_NO_REF_LAST3 |
+                    AOM_EFLAG_NO_REF_ARF | AOM_EFLAG_NO_REF_BWD |
+                    AOM_EFLAG_NO_REF_ARF2;
+  if (ksvc_mode) {
+    // Same pattern as case 8.
+    layering_mode = 8;
+    if (!is_key_frame)
+      // No inter-layer prediction on inter-frames.
+      layer_flags |= AOM_EFLAG_NO_REF_GF;
+  }
+  switch (layering_mode) {
+    case 0:
+      // 1-layer: update LAST on every frame, reference LAST and GF.
+      layer_id->temporal_layer_id = 0;
+      ref_frame_config->refresh[0] = 1;
+      break;
+    case 1:
+      // 2-temporal layer.
+      //    1    3    5
+      //  0    2    4
+      if (superframe_cnt % 2 == 0) {
+        layer_id->temporal_layer_id = 0;
+        // Update LAST on layer 0, reference LAST and GF.
+        ref_frame_config->refresh[0] = 1;
+      } else {
+        layer_id->temporal_layer_id = 1;
+        // No updates on layer 1, only reference LAST (TL0).
+        layer_flags |= AOM_EFLAG_NO_REF_GF;
+      }
+      break;
+    case 2:
+      // 3-temporal layer:
+      //   1    3   5    7
+      //     2        6
+      // 0        4        8
+      if (superframe_cnt % 4 == 0) {
+        // Base layer.
+        layer_id->temporal_layer_id = 0;
+        // Update LAST on layer 0, reference LAST and GF.
+        ref_frame_config->refresh[0] = 1;
+      } else if ((superframe_cnt - 1) % 4 == 0) {
+        layer_id->temporal_layer_id = 2;
+        // First top layer: no updates, only reference LAST (TL0).
+        layer_flags |= AOM_EFLAG_NO_REF_GF;
+      } else if ((superframe_cnt - 2) % 4 == 0) {
+        layer_id->temporal_layer_id = 1;
+        // Middle layer (TL1): update LAST2, only reference LAST (TL0).
+        ref_frame_config->refresh[1] = 1;
+        layer_flags |= AOM_EFLAG_NO_REF_GF;
+      } else if ((superframe_cnt - 3) % 4 == 0) {
+        layer_id->temporal_layer_id = 2;
+        // Second top layer: no updates, only reference LAST.
+        // Set buffer idx for LAST to slot 1, since that was the slot
+        // updated in previous frame. So LAST is TL1 frame.
+        ref_frame_config->ref_idx[0] = 1;
+        ref_frame_config->ref_idx[1] = 0;
+        layer_flags |= AOM_EFLAG_NO_REF_GF;
+      }
+      break;
+    case 3:
+      // 3-temporal layer: but middle layer updates GF, so 2nd TL2 will
+      // only reference GF (not LAST). Other frames only reference LAST.
+      //   1    3   5    7
+      //     2        6
+      // 0        4        8
+      if (superframe_cnt % 4 == 0) {
+        // Base layer.
+        layer_id->temporal_layer_id = 0;
+        // Update LAST on layer 0, only reference LAST.
+        ref_frame_config->refresh[0] = 1;
+        layer_flags |= AOM_EFLAG_NO_REF_GF;
+      } else if ((superframe_cnt - 1) % 4 == 0) {
+        layer_id->temporal_layer_id = 2;
+        // First top layer: no updates, only reference LAST (TL0).
+        layer_flags |= AOM_EFLAG_NO_REF_GF;
+      } else if ((superframe_cnt - 2) % 4 == 0) {
+        layer_id->temporal_layer_id = 1;
+        // Middle layer (TL1): update GF, only reference LAST (TL0).
+        ref_frame_config->refresh[3] = 1;
+        layer_flags |= AOM_EFLAG_NO_REF_GF;
+      } else if ((superframe_cnt - 3) % 4 == 0) {
+        layer_id->temporal_layer_id = 2;
+        // Second top layer: no updates, only reference GF.
+        layer_flags |= AOM_EFLAG_NO_REF_LAST;
+      }
+      break;
+    case 4:
+      // 2-temporal layer with the old update flags, not with the new
+      // SVC control.
+      *use_svc_control = 0;
+      //    1    3    5
+      //  0    2    4
+      if (superframe_cnt % 2 == 0) {
+        layer_id->temporal_layer_id = 0;
+        // Update LAST on layer 0, reference LAST and GF.
+        layer_flags |= AOM_EFLAG_NO_UPD_GF | AOM_EFLAG_NO_UPD_ARF;
+      } else {
+        layer_id->temporal_layer_id = 1;
+        // No updates on layer 1, only reference LAST (TL0).
+        layer_flags |= AOM_EFLAG_NO_UPD_LAST | AOM_EFLAG_NO_UPD_GF |
+                       AOM_EFLAG_NO_UPD_ARF | AOM_EFLAG_NO_REF_GF;
+      }
+      break;
+    case 5:
+      // 2 spatial layers, 1 temporal.
+      layer_id->temporal_layer_id = 0;
+      if (layer_id->spatial_layer_id == 0) {
+        // Reference LAST, update LAST.
+        ref_frame_config->refresh[0] = 1;
+        layer_flags |= AOM_EFLAG_NO_REF_GF;
+      } else if (layer_id->spatial_layer_id == 1) {
+        // Reference LAST and GOLDEN. Set buffer_idx for LAST to slot 1
+        // and GOLDEN to slot 0. Update slot 1 (LAST).
+        ref_frame_config->ref_idx[0] = 1;
+        ref_frame_config->ref_idx[3] = 0;
+        ref_frame_config->refresh[1] = 1;
+      }
+      break;
+    case 6:
+      // 3 spatial layers, 1 temporal.
+      // Note for this case, we set the buffer idx for all references to be
+      // either LAST or GOLDEN, which are always valid references, since decoder
+      // will check if any of the 7 references is valid scale in
+      // valid_ref_frame_size().
+      layer_id->temporal_layer_id = 0;
+      if (layer_id->spatial_layer_id == 0) {
+        // Reference LAST, update LAST. Set all buffer_idx to 0.
+        for (i = 0; i < INTER_REFS_PER_FRAME; i++)
+          ref_frame_config->ref_idx[i] = 0;
+        ref_frame_config->refresh[0] = 1;
+        layer_flags |= AOM_EFLAG_NO_REF_GF;
+      } else if (layer_id->spatial_layer_id == 1) {
+        // Reference LAST and GOLDEN. Set buffer_idx for LAST to slot 1
+        // and GOLDEN (and all other refs) to slot 0.
+        // Update slot 1 (LAST).
+        for (i = 0; i < INTER_REFS_PER_FRAME; i++)
+          ref_frame_config->ref_idx[i] = 0;
+        ref_frame_config->ref_idx[0] = 1;
+        ref_frame_config->refresh[1] = 1;
+      } else if (layer_id->spatial_layer_id == 2) {
+        // Reference LAST and GOLDEN. Set buffer_idx for LAST to slot 2
+        // and GOLDEN (and all other refs) to slot 1.
+        // Update slot 2 (LAST).
+        for (i = 0; i < INTER_REFS_PER_FRAME; i++)
+          ref_frame_config->ref_idx[i] = 1;
+        ref_frame_config->ref_idx[0] = 2;
+        ref_frame_config->refresh[2] = 1;
+      }
+      break;
+    case 7:
+      // 3 spatial and 3 temporal layer.
+      // Same as case 8 but overalap in the buffer slot updates.
+      // (shift = 2). The slots 3 and 4 updated by first TL2 are
+      // reused for update in TL1 superframe.
+      // Note for this case, frame order hint must be disabled for
+      // lower resolutios (operating points > 0) to be decoedable.
+    case 8:
+      // 3 spatial and 3 temporal layer.
+      // No overlap in buffer updates between TL2 and TL1.
+      // TL2 updates slot 3 and 4, TL1 updates 5, 6, 7.
+      // Set the references via the svc_ref_frame_config control.
+      layer_flags = 0;
+      // Always reference LAST.
+      ref_frame_config->reference[0] = 1;
+      if (superframe_cnt % 4 == 0) {
+        // Base temporal layer.
+        layer_id->temporal_layer_id = 0;
+        if (layer_id->spatial_layer_id == 0) {
+          // Reference LAST, update LAST.
+          // Set all buffer_idx to 0.
+          for (i = 0; i < INTER_REFS_PER_FRAME; i++)
+            ref_frame_config->ref_idx[i] = 0;
+          ref_frame_config->refresh[0] = 1;
+        } else if (layer_id->spatial_layer_id == 1) {
+          // Reference LAST and GOLDEN. Set buffer_idx for LAST to slot 1,
+          // GOLDEN (and all other refs) to slot 0.
+          // Update slot 1 (LAST).
+          for (i = 0; i < INTER_REFS_PER_FRAME; i++)
+            ref_frame_config->ref_idx[i] = 0;
+          ref_frame_config->ref_idx[0] = 1;
+          ref_frame_config->refresh[1] = 1;
+        } else if (layer_id->spatial_layer_id == 2) {
+          // Reference LAST and GOLDEN. Set buffer_idx for LAST to slot 2,
+          // GOLDEN (and all other refs) to slot 1.
+          // Update slot 2 (LAST).
+          for (i = 0; i < INTER_REFS_PER_FRAME; i++)
+            ref_frame_config->ref_idx[i] = 1;
+          ref_frame_config->ref_idx[0] = 2;
+          ref_frame_config->refresh[2] = 1;
+        }
+      } else if ((superframe_cnt - 1) % 4 == 0) {
+        // First top temporal enhancement layer.
+        layer_id->temporal_layer_id = 2;
+        if (layer_id->spatial_layer_id == 0) {
+          // Reference LAST (slot 0).
+          // Set GOLDEN to slot 3 and update slot 3.
+          // Set all other buffer_idx to slot 0.
+          for (i = 0; i < INTER_REFS_PER_FRAME; i++)
+            ref_frame_config->ref_idx[i] = 0;
+          ref_frame_config->ref_idx[3] = 3;
+          ref_frame_config->refresh[3] = 1;
+        } else if (layer_id->spatial_layer_id == 1) {
+          // Reference LAST and GOLDEN. Set buffer_idx for LAST to slot 1,
+          // GOLDEN (and all other refs) to slot 3.
+          // Set LAST2 to slot 4 and Update slot 4.
+          for (i = 0; i < INTER_REFS_PER_FRAME; i++)
+            ref_frame_config->ref_idx[i] = 3;
+          ref_frame_config->ref_idx[0] = 1;
+          ref_frame_config->ref_idx[1] = 4;
+          ref_frame_config->refresh[4] = 1;
+        } else if (layer_id->spatial_layer_id == 2) {
+          // Reference LAST and GOLDEN. Set buffer_idx for LAST to slot 2,
+          // GOLDEN (and all other refs) to slot 4.
+          // No update.
+          for (i = 0; i < INTER_REFS_PER_FRAME; i++)
+            ref_frame_config->ref_idx[i] = 4;
+          ref_frame_config->ref_idx[0] = 2;
+        }
+      } else if ((superframe_cnt - 2) % 4 == 0) {
+        // Middle temporal enhancement layer.
+        layer_id->temporal_layer_id = 1;
+        if (layer_id->spatial_layer_id == 0) {
+          // Reference LAST.
+          // Set all buffer_idx to 0.
+          // Set GOLDEN to slot 5 and update slot 5.
+          for (i = 0; i < INTER_REFS_PER_FRAME; i++)
+            ref_frame_config->ref_idx[i] = 0;
+          ref_frame_config->ref_idx[3] = 5 - shift;
+          ref_frame_config->refresh[5 - shift] = 1;
+        } else if (layer_id->spatial_layer_id == 1) {
+          // Reference LAST and GOLDEN. Set buffer_idx for LAST to slot 1,
+          // GOLDEN (and all other refs) to slot 5.
+          // Set LAST2 to slot 6 and update slot 6.
+          for (i = 0; i < INTER_REFS_PER_FRAME; i++)
+            ref_frame_config->ref_idx[i] = 5 - shift;
+          ref_frame_config->ref_idx[0] = 1;
+          ref_frame_config->ref_idx[2] = 6 - shift;
+          ref_frame_config->refresh[6 - shift] = 1;
+        } else if (layer_id->spatial_layer_id == 2) {
+          // Reference LAST and GOLDEN. Set buffer_idx for LAST to slot 2,
+          // GOLDEN (and all other refs) to slot 6.
+          // Set LAST2 to slot 6 and update slot 7.
+          for (i = 0; i < INTER_REFS_PER_FRAME; i++)
+            ref_frame_config->ref_idx[i] = 6 - shift;
+          ref_frame_config->ref_idx[0] = 2;
+          ref_frame_config->ref_idx[2] = 7 - shift;
+          ref_frame_config->refresh[7 - shift] = 1;
+        }
+      } else if ((superframe_cnt - 3) % 4 == 0) {
+        // Second top temporal enhancement layer.
+        layer_id->temporal_layer_id = 2;
+        if (layer_id->spatial_layer_id == 0) {
+          // Set LAST to slot 5 and reference LAST.
+          // Set GOLDEN to slot 3 and update slot 3.
+          // Set all other buffer_idx to 0.
+          for (i = 0; i < INTER_REFS_PER_FRAME; i++)
+            ref_frame_config->ref_idx[i] = 0;
+          ref_frame_config->ref_idx[0] = 5 - shift;
+          ref_frame_config->ref_idx[3] = 3;
+          ref_frame_config->refresh[3] = 1;
+        } else if (layer_id->spatial_layer_id == 1) {
+          // Reference LAST and GOLDEN. Set buffer_idx for LAST to slot 6,
+          // GOLDEN to slot 3. Set LAST2 to slot 4 and update slot 4.
+          for (i = 0; i < INTER_REFS_PER_FRAME; i++)
+            ref_frame_config->ref_idx[i] = 0;
+          ref_frame_config->ref_idx[0] = 6 - shift;
+          ref_frame_config->ref_idx[3] = 3;
+          ref_frame_config->ref_idx[1] = 4;
+          ref_frame_config->refresh[4] = 1;
+        } else if (layer_id->spatial_layer_id == 2) {
+          // Reference LAST and GOLDEN. Set buffer_idx for LAST to slot 7,
+          // GOLDEN to slot 4. No update.
+          for (i = 0; i < INTER_REFS_PER_FRAME; i++)
+            ref_frame_config->ref_idx[i] = 0;
+          ref_frame_config->ref_idx[0] = 7 - shift;
+          ref_frame_config->ref_idx[3] = 4;
+        }
+      }
+      if (layer_id->spatial_layer_id > 0)
+        ref_frame_config->reference[3] = 1;  // Reference GOLDEN.
+      break;
+    default: assert(0); die("Error: Unsupported temporal layering mode!\n");
+  }
+  return layer_flags;
+}
+
+int main(int argc, char **argv) {
+  AvxVideoWriter *outfile[AOM_MAX_LAYERS] = { NULL };
+  aom_codec_ctx_t codec;
+  aom_codec_enc_cfg_t cfg;
+  int frame_cnt = 0;
+  aom_image_t raw;
+  aom_codec_err_t res;
+  unsigned int width;
+  unsigned int height;
+  uint32_t error_resilient = 0;
+  int speed;
+  int frame_avail;
+  int got_data = 0;
+  int flags = 0;
+  unsigned i;
+  int pts = 0;             // PTS starts at 0.
+  int frame_duration = 1;  // 1 timebase tick per frame.
+  int layering_mode = 0;
+  aom_svc_layer_id_t layer_id;
+  aom_svc_params_t svc_params;
+  aom_svc_ref_frame_config_t ref_frame_config;
+  const AvxInterface *encoder = NULL;
+  struct AvxInputContext input_ctx;
+  struct RateControlMetrics rc;
+  int64_t cx_time = 0;
+  const int min_args_base = 13;
+  const int min_args = min_args_base;
+  double sum_bitrate = 0.0;
+  double sum_bitrate2 = 0.0;
+  double framerate = 30.0;
+  int use_svc_control = 1;
+  zero(rc.layer_target_bitrate);
+  memset(&layer_id, 0, sizeof(aom_svc_layer_id_t));
+  memset(&input_ctx, 0, sizeof(input_ctx));
+  memset(&svc_params, 0, sizeof(svc_params));
+
+  // Flag to test dynamic scaling of source frames for single
+  // spatial stream, using the scaling_mode control.
+  const int test_dynamic_scaling_single_layer = 0;
+
+  /* Setup default input stream settings */
+  input_ctx.framerate.numerator = 30;
+  input_ctx.framerate.denominator = 1;
+  input_ctx.only_i420 = 1;
+  input_ctx.bit_depth = 0;
+  unsigned int ts_number_layers = 1;
+  unsigned int ss_number_layers = 1;
+  exec_name = argv[0];
+  // Check usage and arguments.
+  if (argc < min_args) {
+    die("Usage: %s <infile> <outfile> <codec_type(av1)> <width> <height> "
+        "<rate_num> <rate_den> <speed> <frame_drop_threshold> "
+        "<error_resilient> <threads> <mode> "
+        "<Rate_0> ... <Rate_nlayers-1>\n",
+        argv[0]);
+  }
+
+  encoder = get_aom_encoder_by_name(argv[3]);
+
+  width = (unsigned int)strtoul(argv[4], NULL, 0);
+  height = (unsigned int)strtoul(argv[5], NULL, 0);
+  if (width < 16 || width % 2 || height < 16 || height % 2) {
+    die("Invalid resolution: %d x %d", width, height);
+  }
+
+  layering_mode = (int)strtol(argv[12], NULL, 0);
+  if (layering_mode < 0 || layering_mode > 13) {
+    die("Invalid layering mode (0..12) %s", argv[12]);
+  }
+
+  if (argc != min_args + mode_to_num_layers[layering_mode]) {
+    die("Invalid number of arguments");
+  }
+
+  ts_number_layers = mode_to_num_temporal_layers[layering_mode];
+  ss_number_layers = mode_to_num_spatial_layers[layering_mode];
+
+  input_ctx.filename = argv[1];
+  open_input_file(&input_ctx, 0);
+
+  // Y4M reader has its own allocation.
+  if (input_ctx.file_type != FILE_TYPE_Y4M) {
+    if (!aom_img_alloc(&raw, AOM_IMG_FMT_I420, width, height, 32)) {
+      die("Failed to allocate image", width, height);
+    }
+  }
+
+  // Populate encoder configuration.
+  res = aom_codec_enc_config_default(encoder->codec_interface(), &cfg, 0);
+  if (res) {
+    printf("Failed to get config: %s\n", aom_codec_err_to_string(res));
+    return EXIT_FAILURE;
+  }
+
+  // Update the default configuration with our settings.
+  cfg.g_w = width;
+  cfg.g_h = height;
+
+  // Timebase format e.g. 30fps: numerator=1, demoninator = 30.
+  cfg.g_timebase.num = (int)strtol(argv[6], NULL, 0);
+  cfg.g_timebase.den = (int)strtol(argv[7], NULL, 0);
+
+  speed = (int)strtol(argv[8], NULL, 0);
+  if (speed < 0 || speed > 8) {
+    die("Invalid speed setting: must be positive");
+  }
+
+  for (i = min_args_base;
+       (int)i < min_args_base + mode_to_num_layers[layering_mode]; ++i) {
+    rc.layer_target_bitrate[i - 13] = (int)strtol(argv[i], NULL, 0);
+    svc_params.layer_target_bitrate[i - 13] = rc.layer_target_bitrate[i - 13];
+  }
+
+  cfg.rc_target_bitrate =
+      svc_params.layer_target_bitrate[ss_number_layers * ts_number_layers - 1];
+
+  svc_params.framerate_factor[0] = 1;
+  if (ts_number_layers == 2) {
+    svc_params.framerate_factor[0] = 2;
+    svc_params.framerate_factor[1] = 1;
+  } else if (ts_number_layers == 3) {
+    svc_params.framerate_factor[0] = 4;
+    svc_params.framerate_factor[1] = 2;
+    svc_params.framerate_factor[2] = 1;
+  }
+
+  // Real time parameters.
+  cfg.g_usage = AOM_USAGE_REALTIME;
+
+  cfg.rc_dropframe_thresh = (unsigned int)strtoul(argv[9], NULL, 0);
+  cfg.rc_end_usage = AOM_CBR;
+  cfg.rc_min_quantizer = 2;
+  cfg.rc_max_quantizer = 52;
+  cfg.rc_undershoot_pct = 50;
+  cfg.rc_overshoot_pct = 50;
+  cfg.rc_buf_initial_sz = 600;
+  cfg.rc_buf_optimal_sz = 600;
+  cfg.rc_buf_sz = 1000;
+
+  // Use 1 thread as default.
+  cfg.g_threads = (unsigned int)strtoul(argv[11], NULL, 0);
+
+  error_resilient = (uint32_t)strtoul(argv[10], NULL, 0);
+  if (error_resilient != 0 && error_resilient != 1) {
+    die("Invalid value for error resilient (0, 1): %d.", error_resilient);
+  }
+  // Enable error resilient mode.
+  cfg.g_error_resilient = error_resilient;
+  cfg.g_lag_in_frames = 0;
+  cfg.kf_mode = AOM_KF_AUTO;
+
+  // Disable automatic keyframe placement.
+  cfg.kf_min_dist = cfg.kf_max_dist = 3000;
+
+  framerate = cfg.g_timebase.den / cfg.g_timebase.num;
+  set_rate_control_metrics(&rc, framerate, ss_number_layers, ts_number_layers);
+
+  if (input_ctx.file_type == FILE_TYPE_Y4M) {
+    if (input_ctx.width != cfg.g_w || input_ctx.height != cfg.g_h) {
+      die("Incorrect width or height: %d x %d", cfg.g_w, cfg.g_h);
+    }
+    if (input_ctx.framerate.numerator != cfg.g_timebase.den ||
+        input_ctx.framerate.denominator != cfg.g_timebase.num) {
+      die("Incorrect framerate: numerator %d denominator %d",
+          cfg.g_timebase.num, cfg.g_timebase.den);
+    }
+  }
+
+  // Open an output file for each stream.
+  for (unsigned int sl = 0; sl < ss_number_layers; ++sl) {
+    for (unsigned tl = 0; tl < ts_number_layers; ++tl) {
+      i = sl * ts_number_layers + tl;
+      char file_name[PATH_MAX];
+      AvxVideoInfo info;
+      info.codec_fourcc = encoder->fourcc;
+      info.frame_width = cfg.g_w;
+      info.frame_height = cfg.g_h;
+      info.time_base.numerator = cfg.g_timebase.num;
+      info.time_base.denominator = cfg.g_timebase.den;
+
+      snprintf(file_name, sizeof(file_name), "%s_%d.av1", argv[2], i);
+      outfile[i] = aom_video_writer_open(file_name, kContainerIVF, &info);
+      if (!outfile[i]) die("Failed to open %s for writing", file_name);
+      assert(outfile[i] != NULL);
+    }
+  }
+
+  // Initialize codec.
+  if (aom_codec_enc_init(&codec, encoder->codec_interface(), &cfg, 0))
+    die_codec(&codec, "Failed to initialize encoder");
+
+  aom_codec_control(&codec, AOME_SET_CPUUSED, speed);
+  aom_codec_control(&codec, AV1E_SET_AQ_MODE, 3);
+  aom_codec_control(&codec, AV1E_SET_GF_CBR_BOOST_PCT, 0);
+  aom_codec_control(&codec, AV1E_SET_ENABLE_CDEF, 1);
+  aom_codec_control(&codec, AV1E_SET_ENABLE_ORDER_HINT, 0);
+  aom_codec_control(&codec, AV1E_SET_ENABLE_TPL_MODEL, 0);
+  aom_codec_control(&codec, AV1E_SET_DELTAQ_MODE, 0);
+
+  svc_params.number_spatial_layers = ss_number_layers;
+  svc_params.number_temporal_layers = ts_number_layers;
+  for (i = 0; i < ss_number_layers * ts_number_layers; ++i) {
+    svc_params.max_quantizers[i] = cfg.rc_max_quantizer;
+    svc_params.min_quantizers[i] = cfg.rc_min_quantizer;
+  }
+  for (i = 0; i < ss_number_layers; ++i) {
+    svc_params.scaling_factor_num[i] = 1;
+    svc_params.scaling_factor_den[i] = 1;
+  }
+  if (ss_number_layers == 2) {
+    svc_params.scaling_factor_num[0] = 1;
+    svc_params.scaling_factor_den[0] = 2;
+  } else if (ss_number_layers == 3) {
+    svc_params.scaling_factor_num[0] = 1;
+    svc_params.scaling_factor_den[0] = 4;
+    svc_params.scaling_factor_num[1] = 1;
+    svc_params.scaling_factor_den[1] = 2;
+  }
+
+  aom_codec_control(&codec, AV1E_SET_SVC_PARAMS, &svc_params);
+
+  // This controls the maximum target size of the key frame.
+  // For generating smaller key frames, use a smaller max_intra_size_pct
+  // value, like 100 or 200.
+  {
+    const int max_intra_size_pct = 300;
+    aom_codec_control(&codec, AOME_SET_MAX_INTRA_BITRATE_PCT,
+                      max_intra_size_pct);
+  }
+
+  frame_avail = 1;
+  while (frame_avail || got_data) {
+    struct aom_usec_timer timer;
+    frame_avail = read_frame(&input_ctx, &raw);
+    int is_key_frame = (frame_cnt % cfg.kf_max_dist) == 0;
+    // Loop over spatial layers.
+    for (unsigned int slx = 0; slx < ss_number_layers; slx++) {
+      aom_codec_iter_t iter = NULL;
+      const aom_codec_cx_pkt_t *pkt;
+      int layer = 0;
+
+      // Set the reference/update flags, layer_id, and reference_map
+      // buffer index.
+      flags = set_layer_pattern(layering_mode, frame_cnt, &layer_id,
+                                &ref_frame_config, &use_svc_control, slx,
+                                is_key_frame, (layering_mode == 9));
+      aom_codec_control(&codec, AV1E_SET_SVC_LAYER_ID, &layer_id);
+      if (use_svc_control)
+        aom_codec_control(&codec, AV1E_SET_SVC_REF_FRAME_CONFIG,
+                          &ref_frame_config);
+
+      layer = slx * ts_number_layers + layer_id.temporal_layer_id;
+      if (frame_avail && slx == 0) ++rc.layer_input_frames[layer];
+
+      if (test_dynamic_scaling_single_layer) {
+        if (frame_cnt >= 200 && frame_cnt <= 400) {
+          // Scale source down by 2x2.
+          struct aom_scaling_mode mode = { AOME_ONETWO, AOME_ONETWO };
+          aom_codec_control(&codec, AOME_SET_SCALEMODE, &mode);
+        } else {
+          // Source back up to original resolution (no scaling).
+          struct aom_scaling_mode mode = { AOME_NORMAL, AOME_NORMAL };
+          aom_codec_control(&codec, AOME_SET_SCALEMODE, &mode);
+        }
+      }
+
+      // Do the layer encode.
+      aom_usec_timer_start(&timer);
+      if (aom_codec_encode(&codec, frame_avail ? &raw : NULL, pts, 1, flags))
+        die_codec(&codec, "Failed to encode frame");
+      aom_usec_timer_mark(&timer);
+      cx_time += aom_usec_timer_elapsed(&timer);
+
+      got_data = 0;
+      while ((pkt = aom_codec_get_cx_data(&codec, &iter))) {
+        got_data = 1;
+        switch (pkt->kind) {
+          case AOM_CODEC_CX_FRAME_PKT:
+            for (unsigned int sl = layer_id.spatial_layer_id;
+                 sl < ss_number_layers; ++sl) {
+              for (unsigned tl = layer_id.temporal_layer_id;
+                   tl < ts_number_layers; ++tl) {
+                unsigned int j = sl * ts_number_layers + tl;
+                aom_video_writer_write_frame(outfile[j], pkt->data.frame.buf,
+                                             pkt->data.frame.sz, pts);
+                if (sl == (unsigned int)layer_id.spatial_layer_id)
+                  rc.layer_encoding_bitrate[j] += 8.0 * pkt->data.frame.sz;
+                // Keep count of rate control stats per layer (for non-key).
+                if (tl == (unsigned int)layer_id.temporal_layer_id &&
+                    sl == (unsigned int)layer_id.spatial_layer_id &&
+                    !(pkt->data.frame.flags & AOM_FRAME_IS_KEY)) {
+                  rc.layer_avg_frame_size[j] += 8.0 * pkt->data.frame.sz;
+                  rc.layer_avg_rate_mismatch[j] +=
+                      fabs(8.0 * pkt->data.frame.sz - rc.layer_pfb[j]) /
+                      rc.layer_pfb[j];
+                  if (slx == 0) ++rc.layer_enc_frames[tl];
+                }
+              }
+            }
+
+            // Update for short-time encoding bitrate states, for moving window
+            // of size rc->window, shifted by rc->window / 2.
+            // Ignore first window segment, due to key frame.
+            // For spatial layers: only do this for top/highest SL.
+            if (frame_cnt > rc.window_size && slx == ss_number_layers - 1) {
+              sum_bitrate += 0.001 * 8.0 * pkt->data.frame.sz * framerate;
+              rc.window_size = (rc.window_size <= 0) ? 1 : rc.window_size;
+              if (frame_cnt % rc.window_size == 0) {
+                rc.window_count += 1;
+                rc.avg_st_encoding_bitrate += sum_bitrate / rc.window_size;
+                rc.variance_st_encoding_bitrate +=
+                    (sum_bitrate / rc.window_size) *
+                    (sum_bitrate / rc.window_size);
+                sum_bitrate = 0.0;
+              }
+            }
+            // Second shifted window.
+            if (frame_cnt > rc.window_size + rc.window_size / 2 &&
+                slx == ss_number_layers - 1) {
+              sum_bitrate2 += 0.001 * 8.0 * pkt->data.frame.sz * framerate;
+              if (frame_cnt > 2 * rc.window_size &&
+                  frame_cnt % rc.window_size == 0) {
+                rc.window_count += 1;
+                rc.avg_st_encoding_bitrate += sum_bitrate2 / rc.window_size;
+                rc.variance_st_encoding_bitrate +=
+                    (sum_bitrate2 / rc.window_size) *
+                    (sum_bitrate2 / rc.window_size);
+                sum_bitrate2 = 0.0;
+              }
+            }
+            break;
+          default: break;
+        }
+      }
+    }  // loop over spatial layers
+    ++frame_cnt;
+    pts += frame_duration;
+  }
+  close_input_file(&input_ctx);
+  printout_rate_control_summary(&rc, frame_cnt, ss_number_layers,
+                                ts_number_layers);
+  printf("\n");
+  printf("Frame cnt and encoding time/FPS stats for encoding: %d %f %f\n",
+         frame_cnt, 1000 * (float)cx_time / (double)(frame_cnt * 1000000),
+         1000000 * (double)frame_cnt / (double)cx_time);
+
+  if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec");
+
+  // Try to rewrite the output file headers with the actual frame count.
+  for (i = 0; i < ss_number_layers * ts_number_layers; ++i)
+    aom_video_writer_close(outfile[i]);
+
+  if (input_ctx.file_type != FILE_TYPE_Y4M) {
+    aom_img_free(&raw);
+  }
+  return EXIT_SUCCESS;
+}
diff --git a/libs/libaom/src/examples/twopass_encoder.c b/libs/libaom/src/examples/twopass_encoder.c
new file mode 100644
index 000000000..a03bc6cc2
--- /dev/null
+++ b/libs/libaom/src/examples/twopass_encoder.c
@@ -0,0 +1,250 @@
+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+// Two Pass Encoder
+// ================
+//
+// This is an example of a two pass encoder loop. It takes an input file in
+// YV12 format, passes it through the encoder twice, and writes the compressed
+// frames to disk in IVF format. It builds upon the simple_encoder example.
+//
+// Twopass Variables
+// -----------------
+// Twopass mode needs to track the current pass number and the buffer of
+// statistics packets.
+//
+// Updating The Configuration
+// ---------------------------------
+// In two pass mode, the configuration has to be updated on each pass. The
+// statistics buffer is passed on the last pass.
+//
+// Encoding A Frame
+// ----------------
+// Encoding a frame in two pass mode is identical to the simple encoder
+// example.
+//
+// Processing Statistics Packets
+// -----------------------------
+// Each packet of type `AOM_CODEC_CX_FRAME_PKT` contains the encoded data
+// for this frame. We write a IVF frame header, followed by the raw data.
+//
+//
+// Pass Progress Reporting
+// -----------------------------
+// It's sometimes helpful to see when each pass completes.
+//
+//
+// Clean-up
+// -----------------------------
+// Destruction of the encoder instance must be done on each pass. The
+// raw image should be destroyed at the end as usual.
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "aom/aom_encoder.h"
+#include "common/tools_common.h"
+#include "common/video_writer.h"
+
+static const char *exec_name;
+
+void usage_exit(void) {
+  fprintf(stderr,
+          "Usage: %s <codec> <width> <height> <infile> <outfile> "
+          "<limit(optional)>\n",
+          exec_name);
+  exit(EXIT_FAILURE);
+}
+
+static int get_frame_stats(aom_codec_ctx_t *ctx, const aom_image_t *img,
+                           aom_codec_pts_t pts, unsigned int duration,
+                           aom_enc_frame_flags_t flags,
+                           aom_fixed_buf_t *stats) {
+  int got_pkts = 0;
+  aom_codec_iter_t iter = NULL;
+  const aom_codec_cx_pkt_t *pkt = NULL;
+  const aom_codec_err_t res = aom_codec_encode(ctx, img, pts, duration, flags);
+  if (res != AOM_CODEC_OK) die_codec(ctx, "Failed to get frame stats.");
+
+  while ((pkt = aom_codec_get_cx_data(ctx, &iter)) != NULL) {
+    got_pkts = 1;
+
+    if (pkt->kind == AOM_CODEC_STATS_PKT) {
+      const uint8_t *const pkt_buf = pkt->data.twopass_stats.buf;
+      const size_t pkt_size = pkt->data.twopass_stats.sz;
+      stats->buf = realloc(stats->buf, stats->sz + pkt_size);
+      memcpy((uint8_t *)stats->buf + stats->sz, pkt_buf, pkt_size);
+      stats->sz += pkt_size;
+    }
+  }
+
+  return got_pkts;
+}
+
+static int encode_frame(aom_codec_ctx_t *ctx, const aom_image_t *img,
+                        aom_codec_pts_t pts, unsigned int duration,
+                        aom_enc_frame_flags_t flags, AvxVideoWriter *writer) {
+  int got_pkts = 0;
+  aom_codec_iter_t iter = NULL;
+  const aom_codec_cx_pkt_t *pkt = NULL;
+  const aom_codec_err_t res = aom_codec_encode(ctx, img, pts, duration, flags);
+  if (res != AOM_CODEC_OK) die_codec(ctx, "Failed to encode frame.");
+
+  while ((pkt = aom_codec_get_cx_data(ctx, &iter)) != NULL) {
+    got_pkts = 1;
+    if (pkt->kind == AOM_CODEC_CX_FRAME_PKT) {
+      const int keyframe = (pkt->data.frame.flags & AOM_FRAME_IS_KEY) != 0;
+
+      if (!aom_video_writer_write_frame(writer, pkt->data.frame.buf,
+                                        pkt->data.frame.sz,
+                                        pkt->data.frame.pts))
+        die_codec(ctx, "Failed to write compressed frame.");
+      printf(keyframe ? "K" : ".");
+      fflush(stdout);
+    }
+  }
+
+  return got_pkts;
+}
+
+static aom_fixed_buf_t pass0(aom_image_t *raw, FILE *infile,
+                             const AvxInterface *encoder,
+                             const aom_codec_enc_cfg_t *cfg, int limit) {
+  aom_codec_ctx_t codec;
+  int frame_count = 0;
+  aom_fixed_buf_t stats = { NULL, 0 };
+
+  if (aom_codec_enc_init(&codec, encoder->codec_interface(), cfg, 0))
+    die_codec(&codec, "Failed to initialize encoder");
+
+  // Calculate frame statistics.
+  while (aom_img_read(raw, infile) && frame_count < limit) {
+    ++frame_count;
+    get_frame_stats(&codec, raw, frame_count, 1, 0, &stats);
+  }
+
+  // Flush encoder.
+  while (get_frame_stats(&codec, NULL, frame_count, 1, 0, &stats)) {
+  }
+
+  printf("Pass 0 complete. Processed %d frames.\n", frame_count);
+  if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec.");
+
+  return stats;
+}
+
+static void pass1(aom_image_t *raw, FILE *infile, const char *outfile_name,
+                  const AvxInterface *encoder, const aom_codec_enc_cfg_t *cfg,
+                  int limit) {
+  AvxVideoInfo info = { encoder->fourcc,
+                        cfg->g_w,
+                        cfg->g_h,
+                        { cfg->g_timebase.num, cfg->g_timebase.den },
+                        0 };
+  AvxVideoWriter *writer = NULL;
+  aom_codec_ctx_t codec;
+  int frame_count = 0;
+
+  writer = aom_video_writer_open(outfile_name, kContainerIVF, &info);
+  if (!writer) die("Failed to open %s for writing", outfile_name);
+
+  if (aom_codec_enc_init(&codec, encoder->codec_interface(), cfg, 0))
+    die_codec(&codec, "Failed to initialize encoder");
+
+  // Encode frames.
+  while (aom_img_read(raw, infile) && frame_count < limit) {
+    ++frame_count;
+    encode_frame(&codec, raw, frame_count, 1, 0, writer);
+  }
+
+  // Flush encoder.
+  while (encode_frame(&codec, NULL, -1, 1, 0, writer)) {
+  }
+
+  printf("\n");
+
+  if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec.");
+
+  aom_video_writer_close(writer);
+
+  printf("Pass 1 complete. Processed %d frames.\n", frame_count);
+}
+
+int main(int argc, char **argv) {
+  FILE *infile = NULL;
+  int w, h;
+  aom_codec_ctx_t codec;
+  aom_codec_enc_cfg_t cfg;
+  aom_image_t raw;
+  aom_codec_err_t res;
+  aom_fixed_buf_t stats;
+
+  const AvxInterface *encoder = NULL;
+  const int fps = 30;       // TODO(dkovalev) add command line argument
+  const int bitrate = 200;  // kbit/s TODO(dkovalev) add command line argument
+  const char *const codec_arg = argv[1];
+  const char *const width_arg = argv[2];
+  const char *const height_arg = argv[3];
+  const char *const infile_arg = argv[4];
+  const char *const outfile_arg = argv[5];
+  int limit = 0;
+  exec_name = argv[0];
+
+  if (argc < 6) die("Invalid number of arguments");
+
+  if (argc > 6) limit = (int)strtol(argv[6], NULL, 0);
+
+  if (limit == 0) limit = 100;
+
+  encoder = get_aom_encoder_by_name(codec_arg);
+  if (!encoder) die("Unsupported codec.");
+
+  w = (int)strtol(width_arg, NULL, 0);
+  h = (int)strtol(height_arg, NULL, 0);
+
+  if (w <= 0 || h <= 0 || (w % 2) != 0 || (h % 2) != 0)
+    die("Invalid frame size: %dx%d", w, h);
+
+  if (!aom_img_alloc(&raw, AOM_IMG_FMT_I420, w, h, 1))
+    die("Failed to allocate image", w, h);
+
+  printf("Using %s\n", aom_codec_iface_name(encoder->codec_interface()));
+
+  // Configuration
+  res = aom_codec_enc_config_default(encoder->codec_interface(), &cfg, 0);
+  if (res) die_codec(&codec, "Failed to get default codec config.");
+
+  cfg.g_w = w;
+  cfg.g_h = h;
+  cfg.g_timebase.num = 1;
+  cfg.g_timebase.den = fps;
+  cfg.rc_target_bitrate = bitrate;
+
+  if (!(infile = fopen(infile_arg, "rb")))
+    die("Failed to open %s for reading", infile_arg);
+
+  // Pass 0
+  cfg.g_pass = AOM_RC_FIRST_PASS;
+  stats = pass0(&raw, infile, encoder, &cfg, limit);
+
+  // Pass 1
+  rewind(infile);
+  cfg.g_pass = AOM_RC_LAST_PASS;
+  cfg.rc_twopass_stats_in = stats;
+  pass1(&raw, infile, outfile_arg, encoder, &cfg, limit);
+  free(stats.buf);
+
+  aom_img_free(&raw);
+  fclose(infile);
+
+  return EXIT_SUCCESS;
+}