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Diffstat (limited to 'media/libwebp/enc/picture_psnr_enc.c')
-rw-r--r--media/libwebp/enc/picture_psnr_enc.c258
1 files changed, 258 insertions, 0 deletions
diff --git a/media/libwebp/enc/picture_psnr_enc.c b/media/libwebp/enc/picture_psnr_enc.c
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+++ b/media/libwebp/enc/picture_psnr_enc.c
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+// Copyright 2014 Google Inc. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING 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.
+// -----------------------------------------------------------------------------
+//
+// WebPPicture tools for measuring distortion
+//
+// Author: Skal (pascal.massimino@gmail.com)
+
+#include "../webp/encode.h"
+
+#if !(defined(WEBP_DISABLE_STATS) || defined(WEBP_REDUCE_SIZE))
+
+#include <math.h>
+#include <stdlib.h>
+
+#include "../dsp/dsp.h"
+#include "../enc/vp8i_enc.h"
+#include "../utils/utils.h"
+
+typedef double (*AccumulateFunc)(const uint8_t* src, int src_stride,
+ const uint8_t* ref, int ref_stride,
+ int w, int h);
+
+//------------------------------------------------------------------------------
+// local-min distortion
+//
+// For every pixel in the *reference* picture, we search for the local best
+// match in the compressed image. This is not a symmetrical measure.
+
+#define RADIUS 2 // search radius. Shouldn't be too large.
+
+static double AccumulateLSIM(const uint8_t* src, int src_stride,
+ const uint8_t* ref, int ref_stride,
+ int w, int h) {
+ int x, y;
+ double total_sse = 0.;
+ for (y = 0; y < h; ++y) {
+ const int y_0 = (y - RADIUS < 0) ? 0 : y - RADIUS;
+ const int y_1 = (y + RADIUS + 1 >= h) ? h : y + RADIUS + 1;
+ for (x = 0; x < w; ++x) {
+ const int x_0 = (x - RADIUS < 0) ? 0 : x - RADIUS;
+ const int x_1 = (x + RADIUS + 1 >= w) ? w : x + RADIUS + 1;
+ double best_sse = 255. * 255.;
+ const double value = (double)ref[y * ref_stride + x];
+ int i, j;
+ for (j = y_0; j < y_1; ++j) {
+ const uint8_t* const s = src + j * src_stride;
+ for (i = x_0; i < x_1; ++i) {
+ const double diff = s[i] - value;
+ const double sse = diff * diff;
+ if (sse < best_sse) best_sse = sse;
+ }
+ }
+ total_sse += best_sse;
+ }
+ }
+ return total_sse;
+}
+#undef RADIUS
+
+static double AccumulateSSE(const uint8_t* src, int src_stride,
+ const uint8_t* ref, int ref_stride,
+ int w, int h) {
+ int y;
+ double total_sse = 0.;
+ for (y = 0; y < h; ++y) {
+ total_sse += VP8AccumulateSSE(src, ref, w);
+ src += src_stride;
+ ref += ref_stride;
+ }
+ return total_sse;
+}
+
+//------------------------------------------------------------------------------
+
+static double AccumulateSSIM(const uint8_t* src, int src_stride,
+ const uint8_t* ref, int ref_stride,
+ int w, int h) {
+ const int w0 = (w < VP8_SSIM_KERNEL) ? w : VP8_SSIM_KERNEL;
+ const int w1 = w - VP8_SSIM_KERNEL - 1;
+ const int h0 = (h < VP8_SSIM_KERNEL) ? h : VP8_SSIM_KERNEL;
+ const int h1 = h - VP8_SSIM_KERNEL - 1;
+ int x, y;
+ double sum = 0.;
+ for (y = 0; y < h0; ++y) {
+ for (x = 0; x < w; ++x) {
+ sum += VP8SSIMGetClipped(src, src_stride, ref, ref_stride, x, y, w, h);
+ }
+ }
+ for (; y < h1; ++y) {
+ for (x = 0; x < w0; ++x) {
+ sum += VP8SSIMGetClipped(src, src_stride, ref, ref_stride, x, y, w, h);
+ }
+ for (; x < w1; ++x) {
+ const int off1 = x - VP8_SSIM_KERNEL + (y - VP8_SSIM_KERNEL) * src_stride;
+ const int off2 = x - VP8_SSIM_KERNEL + (y - VP8_SSIM_KERNEL) * ref_stride;
+ sum += VP8SSIMGet(src + off1, src_stride, ref + off2, ref_stride);
+ }
+ for (; x < w; ++x) {
+ sum += VP8SSIMGetClipped(src, src_stride, ref, ref_stride, x, y, w, h);
+ }
+ }
+ for (; y < h; ++y) {
+ for (x = 0; x < w; ++x) {
+ sum += VP8SSIMGetClipped(src, src_stride, ref, ref_stride, x, y, w, h);
+ }
+ }
+ return sum;
+}
+
+//------------------------------------------------------------------------------
+// Distortion
+
+// Max value returned in case of exact similarity.
+static const double kMinDistortion_dB = 99.;
+
+static double GetPSNR(double v, double size) {
+ return (v > 0. && size > 0.) ? -4.3429448 * log(v / (size * 255 * 255.))
+ : kMinDistortion_dB;
+}
+
+static double GetLogSSIM(double v, double size) {
+ v = (size > 0.) ? v / size : 1.;
+ return (v < 1.) ? -10.0 * log10(1. - v) : kMinDistortion_dB;
+}
+
+int WebPPlaneDistortion(const uint8_t* src, size_t src_stride,
+ const uint8_t* ref, size_t ref_stride,
+ int width, int height, size_t x_step,
+ int type, float* distortion, float* result) {
+ uint8_t* allocated = NULL;
+ const AccumulateFunc metric = (type == 0) ? AccumulateSSE :
+ (type == 1) ? AccumulateSSIM :
+ AccumulateLSIM;
+ if (src == NULL || ref == NULL ||
+ src_stride < x_step * width || ref_stride < x_step * width ||
+ result == NULL || distortion == NULL) {
+ return 0;
+ }
+
+ VP8SSIMDspInit();
+ if (x_step != 1) { // extract a packed plane if needed
+ int x, y;
+ uint8_t* tmp1;
+ uint8_t* tmp2;
+ allocated =
+ (uint8_t*)WebPSafeMalloc(2ULL * width * height, sizeof(*allocated));
+ if (allocated == NULL) return 0;
+ tmp1 = allocated;
+ tmp2 = tmp1 + (size_t)width * height;
+ for (y = 0; y < height; ++y) {
+ for (x = 0; x < width; ++x) {
+ tmp1[x + y * width] = src[x * x_step + y * src_stride];
+ tmp2[x + y * width] = ref[x * x_step + y * ref_stride];
+ }
+ }
+ src = tmp1;
+ ref = tmp2;
+ }
+ *distortion = (float)metric(src, width, ref, width, width, height);
+ WebPSafeFree(allocated);
+
+ *result = (type == 1) ? (float)GetLogSSIM(*distortion, (double)width * height)
+ : (float)GetPSNR(*distortion, (double)width * height);
+ return 1;
+}
+
+#ifdef WORDS_BIGENDIAN
+#define BLUE_OFFSET 3 // uint32_t 0x000000ff is 0x00,00,00,ff in memory
+#else
+#define BLUE_OFFSET 0 // uint32_t 0x000000ff is 0xff,00,00,00 in memory
+#endif
+
+int WebPPictureDistortion(const WebPPicture* src, const WebPPicture* ref,
+ int type, float results[5]) {
+ int w, h, c;
+ int ok = 0;
+ WebPPicture p0, p1;
+ double total_size = 0., total_distortion = 0.;
+ if (src == NULL || ref == NULL ||
+ src->width != ref->width || src->height != ref->height ||
+ results == NULL) {
+ return 0;
+ }
+
+ VP8SSIMDspInit();
+ if (!WebPPictureInit(&p0) || !WebPPictureInit(&p1)) return 0;
+ w = src->width;
+ h = src->height;
+ if (!WebPPictureView(src, 0, 0, w, h, &p0)) goto Error;
+ if (!WebPPictureView(ref, 0, 0, w, h, &p1)) goto Error;
+
+ // We always measure distortion in ARGB space.
+ if (p0.use_argb == 0 && !WebPPictureYUVAToARGB(&p0)) goto Error;
+ if (p1.use_argb == 0 && !WebPPictureYUVAToARGB(&p1)) goto Error;
+ for (c = 0; c < 4; ++c) {
+ float distortion;
+ const size_t stride0 = 4 * (size_t)p0.argb_stride;
+ const size_t stride1 = 4 * (size_t)p1.argb_stride;
+ // results are reported as BGRA
+ const int offset = c ^ BLUE_OFFSET;
+ if (!WebPPlaneDistortion((const uint8_t*)p0.argb + offset, stride0,
+ (const uint8_t*)p1.argb + offset, stride1,
+ w, h, 4, type, &distortion, results + c)) {
+ goto Error;
+ }
+ total_distortion += distortion;
+ total_size += w * h;
+ }
+
+ results[4] = (type == 1) ? (float)GetLogSSIM(total_distortion, total_size)
+ : (float)GetPSNR(total_distortion, total_size);
+ ok = 1;
+
+ Error:
+ WebPPictureFree(&p0);
+ WebPPictureFree(&p1);
+ return ok;
+}
+
+#undef BLUE_OFFSET
+
+#else // defined(WEBP_DISABLE_STATS)
+int WebPPlaneDistortion(const uint8_t* src, size_t src_stride,
+ const uint8_t* ref, size_t ref_stride,
+ int width, int height, size_t x_step,
+ int type, float* distortion, float* result) {
+ (void)src;
+ (void)src_stride;
+ (void)ref;
+ (void)ref_stride;
+ (void)width;
+ (void)height;
+ (void)x_step;
+ (void)type;
+ if (distortion == NULL || result == NULL) return 0;
+ *distortion = 0.f;
+ *result = 0.f;
+ return 1;
+}
+
+int WebPPictureDistortion(const WebPPicture* src, const WebPPicture* ref,
+ int type, float results[5]) {
+ int i;
+ (void)src;
+ (void)ref;
+ (void)type;
+ if (results == NULL) return 0;
+ for (i = 0; i < 5; ++i) results[i] = 0.f;
+ return 1;
+}
+
+#endif // !defined(WEBP_DISABLE_STATS)
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