--- /dev/null
+/*
+ * Copyright (c) 2010 The WebM project authors. 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 code was originally written by: Nathan E. Egge, at the Daala
+ * project.
+ */
+#include <math.h>
+#include <string.h>
+#include "./vpx_config.h"
+#include "./vp9_rtcd.h"
+#include "vp9/encoder/vp9_ssim.h"
+/* TODO(jbb): High bit depth version of this code needed */
+typedef struct fs_level fs_level;
+typedef struct fs_ctx fs_ctx;
+
+#define SSIM_C1 (255 * 255 * 0.01 * 0.01)
+#define SSIM_C2 (255 * 255 * 0.03 * 0.03)
+
+#define FS_MINI(_a, _b) ((_a) < (_b) ? (_a) : (_b))
+#define FS_MAXI(_a, _b) ((_a) > (_b) ? (_a) : (_b))
+
+struct fs_level {
+ uint16_t *im1;
+ uint16_t *im2;
+ double *ssim;
+ int w;
+ int h;
+};
+
+struct fs_ctx {
+ fs_level *level;
+ int nlevels;
+ unsigned *col_buf;
+};
+
+static void fs_ctx_init(fs_ctx *_ctx, int _w, int _h, int _nlevels) {
+ unsigned char *data;
+ size_t data_size;
+ int lw;
+ int lh;
+ int l;
+ lw = (_w + 1) >> 1;
+ lh = (_h + 1) >> 1;
+ data_size = _nlevels * sizeof(fs_level)
+ + 2 * (lw + 8) * 8 * sizeof(*_ctx->col_buf);
+ for (l = 0; l < _nlevels; l++) {
+ size_t im_size;
+ size_t level_size;
+ im_size = lw * (size_t) lh;
+ level_size = 2 * im_size * sizeof(*_ctx->level[l].im1);
+ level_size += sizeof(*_ctx->level[l].ssim) - 1;
+ level_size /= sizeof(*_ctx->level[l].ssim);
+ level_size += im_size;
+ level_size *= sizeof(*_ctx->level[l].ssim);
+ data_size += level_size;
+ lw = (lw + 1) >> 1;
+ lh = (lh + 1) >> 1;
+ }
+ data = (unsigned char *) malloc(data_size);
+ _ctx->level = (fs_level *) data;
+ _ctx->nlevels = _nlevels;
+ data += _nlevels * sizeof(*_ctx->level);
+ lw = (_w + 1) >> 1;
+ lh = (_h + 1) >> 1;
+ for (l = 0; l < _nlevels; l++) {
+ size_t im_size;
+ size_t level_size;
+ _ctx->level[l].w = lw;
+ _ctx->level[l].h = lh;
+ im_size = lw * (size_t) lh;
+ level_size = 2 * im_size * sizeof(*_ctx->level[l].im1);
+ level_size += sizeof(*_ctx->level[l].ssim) - 1;
+ level_size /= sizeof(*_ctx->level[l].ssim);
+ level_size *= sizeof(*_ctx->level[l].ssim);
+ _ctx->level[l].im1 = (uint16_t *) data;
+ _ctx->level[l].im2 = _ctx->level[l].im1 + im_size;
+ data += level_size;
+ _ctx->level[l].ssim = (double *) data;
+ data += im_size * sizeof(*_ctx->level[l].ssim);
+ lw = (lw + 1) >> 1;
+ lh = (lh + 1) >> 1;
+ }
+ _ctx->col_buf = (unsigned *) data;
+}
+
+static void fs_ctx_clear(fs_ctx *_ctx) {
+ free(_ctx->level);
+}
+
+static void fs_downsample_level(fs_ctx *_ctx, int _l) {
+ const uint16_t *src1;
+ const uint16_t *src2;
+ uint16_t *dst1;
+ uint16_t *dst2;
+ int w2;
+ int h2;
+ int w;
+ int h;
+ int i;
+ int j;
+ w = _ctx->level[_l].w;
+ h = _ctx->level[_l].h;
+ dst1 = _ctx->level[_l].im1;
+ dst2 = _ctx->level[_l].im2;
+ w2 = _ctx->level[_l - 1].w;
+ h2 = _ctx->level[_l - 1].h;
+ src1 = _ctx->level[_l - 1].im1;
+ src2 = _ctx->level[_l - 1].im2;
+ for (j = 0; j < h; j++) {
+ int j0offs;
+ int j1offs;
+ j0offs = 2 * j * w2;
+ j1offs = FS_MINI(2 * j + 1, h2) * w2;
+ for (i = 0; i < w; i++) {
+ int i0;
+ int i1;
+ i0 = 2 * i;
+ i1 = FS_MINI(i0 + 1, w2);
+ dst1[j * w + i] = src1[j0offs + i0] + src1[j0offs + i1]
+ + src1[j1offs + i0] + src1[j1offs + i1];
+ dst2[j * w + i] = src2[j0offs + i0] + src2[j0offs + i1]
+ + src2[j1offs + i0] + src2[j1offs + i1];
+ }
+ }
+}
+
+static void fs_downsample_level0(fs_ctx *_ctx, const unsigned char *_src1,
+ int _s1ystride, const unsigned char *_src2,
+ int _s2ystride, int _w, int _h) {
+ uint16_t *dst1;
+ uint16_t *dst2;
+ int w;
+ int h;
+ int i;
+ int j;
+ w = _ctx->level[0].w;
+ h = _ctx->level[0].h;
+ dst1 = _ctx->level[0].im1;
+ dst2 = _ctx->level[0].im2;
+ for (j = 0; j < h; j++) {
+ int j0;
+ int j1;
+ j0 = 2 * j;
+ j1 = FS_MINI(j0 + 1, _h);
+ for (i = 0; i < w; i++) {
+ int i0;
+ int i1;
+ i0 = 2 * i;
+ i1 = FS_MINI(i0 + 1, _w);
+ dst1[j * w + i] = _src1[j0 * _s1ystride + i0]
+ + _src1[j0 * _s1ystride + i1] + _src1[j1 * _s1ystride + i0]
+ + _src1[j1 * _s1ystride + i1];
+ dst2[j * w + i] = _src2[j0 * _s2ystride + i0]
+ + _src2[j0 * _s2ystride + i1] + _src2[j1 * _s2ystride + i0]
+ + _src2[j1 * _s2ystride + i1];
+ }
+ }
+}
+
+static void fs_apply_luminance(fs_ctx *_ctx, int _l) {
+ unsigned *col_sums_x;
+ unsigned *col_sums_y;
+ uint16_t *im1;
+ uint16_t *im2;
+ double *ssim;
+ double c1;
+ int w;
+ int h;
+ int j0offs;
+ int j1offs;
+ int i;
+ int j;
+ w = _ctx->level[_l].w;
+ h = _ctx->level[_l].h;
+ col_sums_x = _ctx->col_buf;
+ col_sums_y = col_sums_x + w;
+ im1 = _ctx->level[_l].im1;
+ im2 = _ctx->level[_l].im2;
+ for (i = 0; i < w; i++)
+ col_sums_x[i] = 5 * im1[i];
+ for (i = 0; i < w; i++)
+ col_sums_y[i] = 5 * im2[i];
+ for (j = 1; j < 4; j++) {
+ j1offs = FS_MINI(j, h - 1) * w;
+ for (i = 0; i < w; i++)
+ col_sums_x[i] += im1[j1offs + i];
+ for (i = 0; i < w; i++)
+ col_sums_y[i] += im2[j1offs + i];
+ }
+ ssim = _ctx->level[_l].ssim;
+ c1 = (double) (SSIM_C1 * 4096 * (1 << 4 * _l));
+ for (j = 0; j < h; j++) {
+ unsigned mux;
+ unsigned muy;
+ int i0;
+ int i1;
+ mux = 5 * col_sums_x[0];
+ muy = 5 * col_sums_y[0];
+ for (i = 1; i < 4; i++) {
+ i1 = FS_MINI(i, w - 1);
+ mux += col_sums_x[i1];
+ muy += col_sums_y[i1];
+ }
+ for (i = 0; i < w; i++) {
+ ssim[j * w + i] *= (2 * mux * (double) muy + c1)
+ / (mux * (double) mux + muy * (double) muy + c1);
+ if (i + 1 < w) {
+ i0 = FS_MAXI(0, i - 4);
+ i1 = FS_MINI(i + 4, w - 1);
+ mux += col_sums_x[i1] - col_sums_x[i0];
+ muy += col_sums_x[i1] - col_sums_x[i0];
+ }
+ }
+ if (j + 1 < h) {
+ j0offs = FS_MAXI(0, j - 4) * w;
+ for (i = 0; i < w; i++)
+ col_sums_x[i] -= im1[j0offs + i];
+ for (i = 0; i < w; i++)
+ col_sums_y[i] -= im2[j0offs + i];
+ j1offs = FS_MINI(j + 4, h - 1) * w;
+ for (i = 0; i < w; i++)
+ col_sums_x[i] += im1[j1offs + i];
+ for (i = 0; i < w; i++)
+ col_sums_y[i] += im2[j1offs + i];
+ }
+ }
+}
+
+#define FS_COL_SET(_col, _joffs, _ioffs) \
+ do { \
+ unsigned gx; \
+ unsigned gy; \
+ gx = gx_buf[((j + (_joffs)) & 7) * stride + i + (_ioffs)]; \
+ gy = gy_buf[((j + (_joffs)) & 7) * stride + i + (_ioffs)]; \
+ col_sums_gx2[(_col)] = gx * (double)gx; \
+ col_sums_gy2[(_col)] = gy * (double)gy; \
+ col_sums_gxgy[(_col)] = gx * (double)gy; \
+ } \
+ while (0)
+
+#define FS_COL_ADD(_col, _joffs, _ioffs) \
+ do { \
+ unsigned gx; \
+ unsigned gy; \
+ gx = gx_buf[((j + (_joffs)) & 7) * stride + i + (_ioffs)]; \
+ gy = gy_buf[((j + (_joffs)) & 7) * stride + i + (_ioffs)]; \
+ col_sums_gx2[(_col)] += gx * (double)gx; \
+ col_sums_gy2[(_col)] += gy * (double)gy; \
+ col_sums_gxgy[(_col)] += gx * (double)gy; \
+ } \
+ while (0)
+
+#define FS_COL_SUB(_col, _joffs, _ioffs) \
+ do { \
+ unsigned gx; \
+ unsigned gy; \
+ gx = gx_buf[((j + (_joffs)) & 7) * stride + i + (_ioffs)]; \
+ gy = gy_buf[((j + (_joffs)) & 7) * stride + i + (_ioffs)]; \
+ col_sums_gx2[(_col)] -= gx * (double)gx; \
+ col_sums_gy2[(_col)] -= gy * (double)gy; \
+ col_sums_gxgy[(_col)] -= gx * (double)gy; \
+ } \
+ while (0)
+
+#define FS_COL_COPY(_col1, _col2) \
+ do { \
+ col_sums_gx2[(_col1)] = col_sums_gx2[(_col2)]; \
+ col_sums_gy2[(_col1)] = col_sums_gy2[(_col2)]; \
+ col_sums_gxgy[(_col1)] = col_sums_gxgy[(_col2)]; \
+ } \
+ while (0)
+
+#define FS_COL_HALVE(_col1, _col2) \
+ do { \
+ col_sums_gx2[(_col1)] = col_sums_gx2[(_col2)] * 0.5; \
+ col_sums_gy2[(_col1)] = col_sums_gy2[(_col2)] * 0.5; \
+ col_sums_gxgy[(_col1)] = col_sums_gxgy[(_col2)] * 0.5; \
+ } \
+ while (0)
+
+#define FS_COL_DOUBLE(_col1, _col2) \
+ do { \
+ col_sums_gx2[(_col1)] = col_sums_gx2[(_col2)] * 2; \
+ col_sums_gy2[(_col1)] = col_sums_gy2[(_col2)] * 2; \
+ col_sums_gxgy[(_col1)] = col_sums_gxgy[(_col2)] * 2; \
+ } \
+ while (0)
+
+static void fs_calc_structure(fs_ctx *_ctx, int _l) {
+ uint16_t *im1;
+ uint16_t *im2;
+ unsigned *gx_buf;
+ unsigned *gy_buf;
+ double *ssim;
+ double col_sums_gx2[8];
+ double col_sums_gy2[8];
+ double col_sums_gxgy[8];
+ double c2;
+ int stride;
+ int w;
+ int h;
+ int i;
+ int j;
+ w = _ctx->level[_l].w;
+ h = _ctx->level[_l].h;
+ im1 = _ctx->level[_l].im1;
+ im2 = _ctx->level[_l].im2;
+ ssim = _ctx->level[_l].ssim;
+ gx_buf = _ctx->col_buf;
+ stride = w + 8;
+ gy_buf = gx_buf + 8 * stride;
+ memset(gx_buf, 0, 2 * 8 * stride * sizeof(*gx_buf));
+ c2 = SSIM_C2 * (1 << 4 * _l) * 16 * 104;
+ for (j = 0; j < h + 4; j++) {
+ if (j < h - 1) {
+ for (i = 0; i < w - 1; i++) {
+ unsigned g1;
+ unsigned g2;
+ unsigned gx;
+ unsigned gy;
+ g1 = abs(im1[(j + 1) * w + i + 1] - im1[j * w + i]);
+ g2 = abs(im1[(j + 1) * w + i] - im1[j * w + i + 1]);
+ gx = 4 * FS_MAXI(g1, g2) + FS_MINI(g1, g2);
+ g1 = abs(im2[(j + 1) * w + i + 1] - im2[j * w + i]);
+ g2 = abs(im2[(j + 1) * w + i] - im2[j * w + i + 1]);
+ gy = 4 * FS_MAXI(g1, g2) + FS_MINI(g1, g2);
+ gx_buf[(j & 7) * stride + i + 4] = gx;
+ gy_buf[(j & 7) * stride + i + 4] = gy;
+ }
+ } else {
+ memset(gx_buf + (j & 7) * stride, 0, stride * sizeof(*gx_buf));
+ memset(gy_buf + (j & 7) * stride, 0, stride * sizeof(*gy_buf));
+ }
+ if (j >= 4) {
+ int k;
+ col_sums_gx2[3] = col_sums_gx2[2] = col_sums_gx2[1] = col_sums_gx2[0] = 0;
+ col_sums_gy2[3] = col_sums_gy2[2] = col_sums_gy2[1] = col_sums_gy2[0] = 0;
+ col_sums_gxgy[3] = col_sums_gxgy[2] = col_sums_gxgy[1] =
+ col_sums_gxgy[0] = 0;
+ for (i = 4; i < 8; i++) {
+ FS_COL_SET(i, -1, 0);
+ FS_COL_ADD(i, 0, 0);
+ for (k = 1; k < 8 - i; k++) {
+ FS_COL_DOUBLE(i, i);
+ FS_COL_ADD(i, -k - 1, 0);
+ FS_COL_ADD(i, k, 0);
+ }
+ }
+ for (i = 0; i < w; i++) {
+ double mugx2;
+ double mugy2;
+ double mugxgy;
+ mugx2 = col_sums_gx2[0];
+ for (k = 1; k < 8; k++)
+ mugx2 += col_sums_gx2[k];
+ mugy2 = col_sums_gy2[0];
+ for (k = 1; k < 8; k++)
+ mugy2 += col_sums_gy2[k];
+ mugxgy = col_sums_gxgy[0];
+ for (k = 1; k < 8; k++)
+ mugxgy += col_sums_gxgy[k];
+ ssim[(j - 4) * w + i] = (2 * mugxgy + c2) / (mugx2 + mugy2 + c2);
+ if (i + 1 < w) {
+ FS_COL_SET(0, -1, 1);
+ FS_COL_ADD(0, 0, 1);
+ FS_COL_SUB(2, -3, 2);
+ FS_COL_SUB(2, 2, 2);
+ FS_COL_HALVE(1, 2);
+ FS_COL_SUB(3, -4, 3);
+ FS_COL_SUB(3, 3, 3);
+ FS_COL_HALVE(2, 3);
+ FS_COL_COPY(3, 4);
+ FS_COL_DOUBLE(4, 5);
+ FS_COL_ADD(4, -4, 5);
+ FS_COL_ADD(4, 3, 5);
+ FS_COL_DOUBLE(5, 6);
+ FS_COL_ADD(5, -3, 6);
+ FS_COL_ADD(5, 2, 6);
+ FS_COL_DOUBLE(6, 7);
+ FS_COL_ADD(6, -2, 7);
+ FS_COL_ADD(6, 1, 7);
+ FS_COL_SET(7, -1, 8);
+ FS_COL_ADD(7, 0, 8);
+ }
+ }
+ }
+ }
+}
+
+#define FS_NLEVELS (4)
+
+/*These weights were derived from the default weights found in Wang's original
+ Matlab implementation: {0.0448, 0.2856, 0.2363, 0.1333}.
+ We drop the finest scale and renormalize the rest to sum to 1.*/
+
+static const double FS_WEIGHTS[FS_NLEVELS] = {0.2989654541015625,
+ 0.3141326904296875, 0.2473602294921875, 0.1395416259765625};
+
+static double fs_average(fs_ctx *_ctx, int _l) {
+ double *ssim;
+ double ret;
+ int w;
+ int h;
+ int i;
+ int j;
+ w = _ctx->level[_l].w;
+ h = _ctx->level[_l].h;
+ ssim = _ctx->level[_l].ssim;
+ ret = 0;
+ for (j = 0; j < h; j++)
+ for (i = 0; i < w; i++)
+ ret += ssim[j * w + i];
+ return pow(ret / (w * h), FS_WEIGHTS[_l]);
+}
+
+static double calc_ssim(const unsigned char *_src, int _systride,
+ const unsigned char *_dst, int _dystride, int _w, int _h) {
+ fs_ctx ctx;
+ double ret;
+ int l;
+ ret = 1;
+ fs_ctx_init(&ctx, _w, _h, FS_NLEVELS);
+ fs_downsample_level0(&ctx, _src, _systride, _dst, _dystride, _w, _h);
+ for (l = 0; l < FS_NLEVELS - 1; l++) {
+ fs_calc_structure(&ctx, l);
+ ret *= fs_average(&ctx, l);
+ fs_downsample_level(&ctx, l + 1);
+ }
+ fs_calc_structure(&ctx, l);
+ fs_apply_luminance(&ctx, l);
+ ret *= fs_average(&ctx, l);
+ fs_ctx_clear(&ctx);
+ return ret;
+}
+
+static double convert_ssim_db(double _ssim, double _weight) {
+ return 10 * (log10(_weight) - log10(_weight - _ssim));
+}
+
+double vp9_calc_fastssim(YV12_BUFFER_CONFIG *source, YV12_BUFFER_CONFIG *dest,
+ double *ssim_y, double *ssim_u, double *ssim_v) {
+ double ssimv;
+ vp9_clear_system_state();
+
+ *ssim_y = calc_ssim(source->y_buffer, source->y_stride, dest->y_buffer,
+ dest->y_stride, source->y_crop_width,
+ source->y_crop_height);
+
+ *ssim_u = calc_ssim(source->u_buffer, source->uv_stride, dest->u_buffer,
+ dest->uv_stride, source->uv_crop_width,
+ source->uv_crop_height);
+
+ *ssim_v = calc_ssim(source->v_buffer, source->uv_stride, dest->v_buffer,
+ dest->uv_stride, source->uv_crop_width,
+ source->uv_crop_height);
+ ssimv = (*ssim_y) * .8 + .1 * ((*ssim_u) + (*ssim_v));
+
+ return convert_ssim_db(ssimv, 1.0);
+}
projects / platform / upstream / libvpx.git / commitdiff