1 files changed, 448 insertions, 0 deletions
diff --git a/media/libaom/src/av1/common/cfl.c b/media/libaom/src/av1/common/cfl.c
new file mode 100644
index 0000000000..ccc59b4eb7
--- /dev/null
+++ b/media/libaom/src/av1/common/cfl.c
@@ -0,0 +1,448 @@
+/*
+ * 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 "av1/common/cfl.h"
+#include "av1/common/common_data.h"
+#include "av1/common/onyxc_int.h"
+
+#include "config/av1_rtcd.h"
+
+void cfl_init(CFL_CTX *cfl, const SequenceHeader *seq_params) {
+  assert(block_size_wide[CFL_MAX_BLOCK_SIZE] == CFL_BUF_LINE);
+  assert(block_size_high[CFL_MAX_BLOCK_SIZE] == CFL_BUF_LINE);
+
+  memset(&cfl->recon_buf_q3, 0, sizeof(cfl->recon_buf_q3));
+  memset(&cfl->ac_buf_q3, 0, sizeof(cfl->ac_buf_q3));
+  cfl->subsampling_x = seq_params->subsampling_x;
+  cfl->subsampling_y = seq_params->subsampling_y;
+  cfl->are_parameters_computed = 0;
+  cfl->store_y = 0;
+  // The DC_PRED cache is disabled by default and is only enabled in
+  // cfl_rd_pick_alpha
+  cfl->use_dc_pred_cache = 0;
+  cfl->dc_pred_is_cached[CFL_PRED_U] = 0;
+  cfl->dc_pred_is_cached[CFL_PRED_V] = 0;
+}
+
+void cfl_store_dc_pred(MACROBLOCKD *const xd, const uint8_t *input,
+                       CFL_PRED_TYPE pred_plane, int width) {
+  assert(pred_plane < CFL_PRED_PLANES);
+  assert(width <= CFL_BUF_LINE);
+
+  if (get_bitdepth_data_path_index(xd)) {
+    uint16_t *const input_16 = CONVERT_TO_SHORTPTR(input);
+    memcpy(xd->cfl.dc_pred_cache[pred_plane], input_16, width << 1);
+    return;
+  }
+
+  memcpy(xd->cfl.dc_pred_cache[pred_plane], input, width);
+}
+
+static void cfl_load_dc_pred_lbd(const int16_t *dc_pred_cache, uint8_t *dst,
+                                 int dst_stride, int width, int height) {
+  for (int j = 0; j < height; j++) {
+    memcpy(dst, dc_pred_cache, width);
+    dst += dst_stride;
+  }
+}
+
+static void cfl_load_dc_pred_hbd(const int16_t *dc_pred_cache, uint16_t *dst,
+                                 int dst_stride, int width, int height) {
+  const size_t num_bytes = width << 1;
+  for (int j = 0; j < height; j++) {
+    memcpy(dst, dc_pred_cache, num_bytes);
+    dst += dst_stride;
+  }
+}
+void cfl_load_dc_pred(MACROBLOCKD *const xd, uint8_t *dst, int dst_stride,
+                      TX_SIZE tx_size, CFL_PRED_TYPE pred_plane) {
+  const int width = tx_size_wide[tx_size];
+  const int height = tx_size_high[tx_size];
+  assert(pred_plane < CFL_PRED_PLANES);
+  assert(width <= CFL_BUF_LINE);
+  assert(height <= CFL_BUF_LINE);
+  if (get_bitdepth_data_path_index(xd)) {
+    uint16_t *dst_16 = CONVERT_TO_SHORTPTR(dst);
+    cfl_load_dc_pred_hbd(xd->cfl.dc_pred_cache[pred_plane], dst_16, dst_stride,
+                         width, height);
+    return;
+  }
+  cfl_load_dc_pred_lbd(xd->cfl.dc_pred_cache[pred_plane], dst, dst_stride,
+                       width, height);
+}
+
+// Due to frame boundary issues, it is possible that the total area covered by
+// chroma exceeds that of luma. When this happens, we fill the missing pixels by
+// repeating the last columns and/or rows.
+static INLINE void cfl_pad(CFL_CTX *cfl, int width, int height) {
+  const int diff_width = width - cfl->buf_width;
+  const int diff_height = height - cfl->buf_height;
+
+  if (diff_width > 0) {
+    const int min_height = height - diff_height;
+    uint16_t *recon_buf_q3 = cfl->recon_buf_q3 + (width - diff_width);
+    for (int j = 0; j < min_height; j++) {
+      const uint16_t last_pixel = recon_buf_q3[-1];
+      assert(recon_buf_q3 + diff_width <= cfl->recon_buf_q3 + CFL_BUF_SQUARE);
+      for (int i = 0; i < diff_width; i++) {
+        recon_buf_q3[i] = last_pixel;
+      }
+      recon_buf_q3 += CFL_BUF_LINE;
+    }
+    cfl->buf_width = width;
+  }
+  if (diff_height > 0) {
+    uint16_t *recon_buf_q3 =
+        cfl->recon_buf_q3 + ((height - diff_height) * CFL_BUF_LINE);
+    for (int j = 0; j < diff_height; j++) {
+      const uint16_t *last_row_q3 = recon_buf_q3 - CFL_BUF_LINE;
+      assert(recon_buf_q3 + width <= cfl->recon_buf_q3 + CFL_BUF_SQUARE);
+      for (int i = 0; i < width; i++) {
+        recon_buf_q3[i] = last_row_q3[i];
+      }
+      recon_buf_q3 += CFL_BUF_LINE;
+    }
+    cfl->buf_height = height;
+  }
+}
+
+static void subtract_average_c(const uint16_t *src, int16_t *dst, int width,
+                               int height, int round_offset, int num_pel_log2) {
+  int sum = round_offset;
+  const uint16_t *recon = src;
+  for (int j = 0; j < height; j++) {
+    for (int i = 0; i < width; i++) {
+      sum += recon[i];
+    }
+    recon += CFL_BUF_LINE;
+  }
+  const int avg = sum >> num_pel_log2;
+  for (int j = 0; j < height; j++) {
+    for (int i = 0; i < width; i++) {
+      dst[i] = src[i] - avg;
+    }
+    src += CFL_BUF_LINE;
+    dst += CFL_BUF_LINE;
+  }
+}
+
+CFL_SUB_AVG_FN(c)
+
+static INLINE int cfl_idx_to_alpha(int alpha_idx, int joint_sign,
+                                   CFL_PRED_TYPE pred_type) {
+  const int alpha_sign = (pred_type == CFL_PRED_U) ? CFL_SIGN_U(joint_sign)
+                                                   : CFL_SIGN_V(joint_sign);
+  if (alpha_sign == CFL_SIGN_ZERO) return 0;
+  const int abs_alpha_q3 =
+      (pred_type == CFL_PRED_U) ? CFL_IDX_U(alpha_idx) : CFL_IDX_V(alpha_idx);
+  return (alpha_sign == CFL_SIGN_POS) ? abs_alpha_q3 + 1 : -abs_alpha_q3 - 1;
+}
+
+static INLINE void cfl_predict_lbd_c(const int16_t *ac_buf_q3, uint8_t *dst,
+                                     int dst_stride, int alpha_q3, int width,
+                                     int height) {
+  for (int j = 0; j < height; j++) {
+    for (int i = 0; i < width; i++) {
+      dst[i] = clip_pixel(get_scaled_luma_q0(alpha_q3, ac_buf_q3[i]) + dst[i]);
+    }
+    dst += dst_stride;
+    ac_buf_q3 += CFL_BUF_LINE;
+  }
+}
+
+// Null function used for invalid tx_sizes
+void cfl_predict_lbd_null(const int16_t *ac_buf_q3, uint8_t *dst,
+                          int dst_stride, int alpha_q3) {
+  (void)ac_buf_q3;
+  (void)dst;
+  (void)dst_stride;
+  (void)alpha_q3;
+  assert(0);
+}
+
+CFL_PREDICT_FN(c, lbd)
+
+void cfl_predict_hbd_c(const int16_t *ac_buf_q3, uint16_t *dst, int dst_stride,
+                       int alpha_q3, int bit_depth, int width, int height) {
+  for (int j = 0; j < height; j++) {
+    for (int i = 0; i < width; i++) {
+      dst[i] = clip_pixel_highbd(
+          get_scaled_luma_q0(alpha_q3, ac_buf_q3[i]) + dst[i], bit_depth);
+    }
+    dst += dst_stride;
+    ac_buf_q3 += CFL_BUF_LINE;
+  }
+}
+
+// Null function used for invalid tx_sizes
+void cfl_predict_hbd_null(const int16_t *ac_buf_q3, uint16_t *dst,
+                          int dst_stride, int alpha_q3, int bd) {
+  (void)ac_buf_q3;
+  (void)dst;
+  (void)dst_stride;
+  (void)alpha_q3;
+  (void)bd;
+  assert(0);
+}
+
+CFL_PREDICT_FN(c, hbd)
+
+static void cfl_compute_parameters(MACROBLOCKD *const xd, TX_SIZE tx_size) {
+  CFL_CTX *const cfl = &xd->cfl;
+  // Do not call cfl_compute_parameters multiple time on the same values.
+  assert(cfl->are_parameters_computed == 0);
+
+  cfl_pad(cfl, tx_size_wide[tx_size], tx_size_high[tx_size]);
+  get_subtract_average_fn(tx_size)(cfl->recon_buf_q3, cfl->ac_buf_q3);
+  cfl->are_parameters_computed = 1;
+}
+
+void cfl_predict_block(MACROBLOCKD *const xd, uint8_t *dst, int dst_stride,
+                       TX_SIZE tx_size, int plane) {
+  CFL_CTX *const cfl = &xd->cfl;
+  MB_MODE_INFO *mbmi = xd->mi[0];
+  assert(is_cfl_allowed(xd));
+
+  if (!cfl->are_parameters_computed) cfl_compute_parameters(xd, tx_size);
+
+  const int alpha_q3 =
+      cfl_idx_to_alpha(mbmi->cfl_alpha_idx, mbmi->cfl_alpha_signs, plane - 1);
+  assert((tx_size_high[tx_size] - 1) * CFL_BUF_LINE + tx_size_wide[tx_size] <=
+         CFL_BUF_SQUARE);
+  if (get_bitdepth_data_path_index(xd)) {
+    uint16_t *dst_16 = CONVERT_TO_SHORTPTR(dst);
+    get_predict_hbd_fn(tx_size)(cfl->ac_buf_q3, dst_16, dst_stride, alpha_q3,
+                                xd->bd);
+    return;
+  }
+  get_predict_lbd_fn(tx_size)(cfl->ac_buf_q3, dst, dst_stride, alpha_q3);
+}
+
+// Null function used for invalid tx_sizes
+void cfl_subsample_lbd_null(const uint8_t *input, int input_stride,
+                            uint16_t *output_q3) {
+  (void)input;
+  (void)input_stride;
+  (void)output_q3;
+  assert(0);
+}
+
+// Null function used for invalid tx_sizes
+void cfl_subsample_hbd_null(const uint16_t *input, int input_stride,
+                            uint16_t *output_q3) {
+  (void)input;
+  (void)input_stride;
+  (void)output_q3;
+  assert(0);
+}
+
+static void cfl_luma_subsampling_420_lbd_c(const uint8_t *input,
+                                           int input_stride,
+                                           uint16_t *output_q3, int width,
+                                           int height) {
+  for (int j = 0; j < height; j += 2) {
+    for (int i = 0; i < width; i += 2) {
+      const int bot = i + input_stride;
+      output_q3[i >> 1] =
+          (input[i] + input[i + 1] + input[bot] + input[bot + 1]) << 1;
+    }
+    input += input_stride << 1;
+    output_q3 += CFL_BUF_LINE;
+  }
+}
+
+static void cfl_luma_subsampling_422_lbd_c(const uint8_t *input,
+                                           int input_stride,
+                                           uint16_t *output_q3, int width,
+                                           int height) {
+  assert((height - 1) * CFL_BUF_LINE + width <= CFL_BUF_SQUARE);
+  for (int j = 0; j < height; j++) {
+    for (int i = 0; i < width; i += 2) {
+      output_q3[i >> 1] = (input[i] + input[i + 1]) << 2;
+    }
+    input += input_stride;
+    output_q3 += CFL_BUF_LINE;
+  }
+}
+
+static void cfl_luma_subsampling_444_lbd_c(const uint8_t *input,
+                                           int input_stride,
+                                           uint16_t *output_q3, int width,
+                                           int height) {
+  assert((height - 1) * CFL_BUF_LINE + width <= CFL_BUF_SQUARE);
+  for (int j = 0; j < height; j++) {
+    for (int i = 0; i < width; i++) {
+      output_q3[i] = input[i] << 3;
+    }
+    input += input_stride;
+    output_q3 += CFL_BUF_LINE;
+  }
+}
+
+static void cfl_luma_subsampling_420_hbd_c(const uint16_t *input,
+                                           int input_stride,
+                                           uint16_t *output_q3, int width,
+                                           int height) {
+  for (int j = 0; j < height; j += 2) {
+    for (int i = 0; i < width; i += 2) {
+      const int bot = i + input_stride;
+      output_q3[i >> 1] =
+          (input[i] + input[i + 1] + input[bot] + input[bot + 1]) << 1;
+    }
+    input += input_stride << 1;
+    output_q3 += CFL_BUF_LINE;
+  }
+}
+
+static void cfl_luma_subsampling_422_hbd_c(const uint16_t *input,
+                                           int input_stride,
+                                           uint16_t *output_q3, int width,
+                                           int height) {
+  assert((height - 1) * CFL_BUF_LINE + width <= CFL_BUF_SQUARE);
+  for (int j = 0; j < height; j++) {
+    for (int i = 0; i < width; i += 2) {
+      output_q3[i >> 1] = (input[i] + input[i + 1]) << 2;
+    }
+    input += input_stride;
+    output_q3 += CFL_BUF_LINE;
+  }
+}
+
+static void cfl_luma_subsampling_444_hbd_c(const uint16_t *input,
+                                           int input_stride,
+                                           uint16_t *output_q3, int width,
+                                           int height) {
+  assert((height - 1) * CFL_BUF_LINE + width <= CFL_BUF_SQUARE);
+  for (int j = 0; j < height; j++) {
+    for (int i = 0; i < width; i++) {
+      output_q3[i] = input[i] << 3;
+    }
+    input += input_stride;
+    output_q3 += CFL_BUF_LINE;
+  }
+}
+
+CFL_GET_SUBSAMPLE_FUNCTION(c)
+
+static INLINE cfl_subsample_hbd_fn cfl_subsampling_hbd(TX_SIZE tx_size,
+                                                       int sub_x, int sub_y) {
+  if (sub_x == 1) {
+    if (sub_y == 1) {
+      return cfl_get_luma_subsampling_420_hbd(tx_size);
+    }
+    return cfl_get_luma_subsampling_422_hbd(tx_size);
+  }
+  return cfl_get_luma_subsampling_444_hbd(tx_size);
+}
+
+static INLINE cfl_subsample_lbd_fn cfl_subsampling_lbd(TX_SIZE tx_size,
+                                                       int sub_x, int sub_y) {
+  if (sub_x == 1) {
+    if (sub_y == 1) {
+      return cfl_get_luma_subsampling_420_lbd(tx_size);
+    }
+    return cfl_get_luma_subsampling_422_lbd(tx_size);
+  }
+  return cfl_get_luma_subsampling_444_lbd(tx_size);
+}
+
+static void cfl_store(CFL_CTX *cfl, const uint8_t *input, int input_stride,
+                      int row, int col, TX_SIZE tx_size, int use_hbd) {
+  const int width = tx_size_wide[tx_size];
+  const int height = tx_size_high[tx_size];
+  const int tx_off_log2 = tx_size_wide_log2[0];
+  const int sub_x = cfl->subsampling_x;
+  const int sub_y = cfl->subsampling_y;
+  const int store_row = row << (tx_off_log2 - sub_y);
+  const int store_col = col << (tx_off_log2 - sub_x);
+  const int store_height = height >> sub_y;
+  const int store_width = width >> sub_x;
+
+  // Invalidate current parameters
+  cfl->are_parameters_computed = 0;
+
+  // Store the surface of the pixel buffer that was written to, this way we
+  // can manage chroma overrun (e.g. when the chroma surfaces goes beyond the
+  // frame boundary)
+  if (col == 0 && row == 0) {
+    cfl->buf_width = store_width;
+    cfl->buf_height = store_height;
+  } else {
+    cfl->buf_width = OD_MAXI(store_col + store_width, cfl->buf_width);
+    cfl->buf_height = OD_MAXI(store_row + store_height, cfl->buf_height);
+  }
+
+  // Check that we will remain inside the pixel buffer.
+  assert(store_row + store_height <= CFL_BUF_LINE);
+  assert(store_col + store_width <= CFL_BUF_LINE);
+
+  // Store the input into the CfL pixel buffer
+  uint16_t *recon_buf_q3 =
+      cfl->recon_buf_q3 + (store_row * CFL_BUF_LINE + store_col);
+
+  if (use_hbd) {
+    cfl_subsampling_hbd(tx_size, sub_x, sub_y)(CONVERT_TO_SHORTPTR(input),
+                                               input_stride, recon_buf_q3);
+  } else {
+    cfl_subsampling_lbd(tx_size, sub_x, sub_y)(input, input_stride,
+                                               recon_buf_q3);
+  }
+}
+
+// Adjust the row and column of blocks smaller than 8X8, as chroma-referenced
+// and non-chroma-referenced blocks are stored together in the CfL buffer.
+static INLINE void sub8x8_adjust_offset(const CFL_CTX *cfl, int *row_out,
+                                        int *col_out) {
+  // Increment row index for bottom: 8x4, 16x4 or both bottom 4x4s.
+  if ((cfl->mi_row & 0x01) && cfl->subsampling_y) {
+    assert(*row_out == 0);
+    (*row_out)++;
+  }
+
+  // Increment col index for right: 4x8, 4x16 or both right 4x4s.
+  if ((cfl->mi_col & 0x01) && cfl->subsampling_x) {
+    assert(*col_out == 0);
+    (*col_out)++;
+  }
+}
+
+void cfl_store_tx(MACROBLOCKD *const xd, int row, int col, TX_SIZE tx_size,
+                  BLOCK_SIZE bsize) {
+  CFL_CTX *const cfl = &xd->cfl;
+  struct macroblockd_plane *const pd = &xd->plane[AOM_PLANE_Y];
+  uint8_t *dst =
+      &pd->dst.buf[(row * pd->dst.stride + col) << tx_size_wide_log2[0]];
+
+  if (block_size_high[bsize] == 4 || block_size_wide[bsize] == 4) {
+    // Only dimensions of size 4 can have an odd offset.
+    assert(!((col & 1) && tx_size_wide[tx_size] != 4));
+    assert(!((row & 1) && tx_size_high[tx_size] != 4));
+    sub8x8_adjust_offset(cfl, &row, &col);
+  }
+  cfl_store(cfl, dst, pd->dst.stride, row, col, tx_size,
+            get_bitdepth_data_path_index(xd));
+}
+
+void cfl_store_block(MACROBLOCKD *const xd, BLOCK_SIZE bsize, TX_SIZE tx_size) {
+  CFL_CTX *const cfl = &xd->cfl;
+  struct macroblockd_plane *const pd = &xd->plane[AOM_PLANE_Y];
+  int row = 0;
+  int col = 0;
+
+  if (block_size_high[bsize] == 4 || block_size_wide[bsize] == 4) {
+    sub8x8_adjust_offset(cfl, &row, &col);
+  }
+  const int width = max_intra_block_width(xd, bsize, AOM_PLANE_Y, tx_size);
+  const int height = max_intra_block_height(xd, bsize, AOM_PLANE_Y, tx_size);
+  tx_size = get_tx_size(width, height);
+  cfl_store(cfl, pd->dst.buf, pd->dst.stride, row, col, tx_size,
+            get_bitdepth_data_path_index(xd));
+}