Import aom library

This is the reference implementation for the Alliance for Open Media's av1 video code.

The commit used was 4d668d7feb1f8abd809d1bca0418570a7f142a36.

1 files changed, 493 insertions, 0 deletions

diff --git a/third_party/aom/aom_dsp/fastssim.c b/third_party/aom/aom_dsp/fastssim.c
new file mode 100644
index 000000000..09d945afc
--- /dev/null
+++ b/third_party/aom/aom_dsp/fastssim.c
@@ -0,0 +1,493 @@
+/*
+ * 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.
+ *
+ *  This code was originally written by: Nathan E. Egge, at the Daala
+ *  project.
+ */
+#include <assert.h>
+#include <math.h>
+#include <stdlib.h>
+#include <string.h>
+#include "./aom_config.h"
+#include "./aom_dsp_rtcd.h"
+#include "aom_dsp/ssim.h"
+#include "aom_ports/system_state.h"
+
+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)
+#if CONFIG_HIGHBITDEPTH
+#define SSIM_C1_10 (1023 * 1023 * 0.01 * 0.01)
+#define SSIM_C1_12 (4095 * 4095 * 0.01 * 0.01)
+#define SSIM_C2_10 (1023 * 1023 * 0.03 * 0.03)
+#define SSIM_C2_12 (4095 * 4095 * 0.03 * 0.03)
+#endif
+#define FS_MINI(_a, _b) ((_a) < (_b) ? (_a) : (_b))
+#define FS_MAXI(_a, _b) ((_a) > (_b) ? (_a) : (_b))
+
+struct fs_level {
+  uint32_t *im1;
+  uint32_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 = (uint32_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 uint32_t *src1;
+  const uint32_t *src2;
+  uint32_t *dst1;
+  uint32_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 uint8_t *_src1,
+                                 int _s1ystride, const uint8_t *_src2,
+                                 int _s2ystride, int _w, int _h, uint32_t bd,
+                                 uint32_t shift) {
+  uint32_t *dst1;
+  uint32_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);
+      if (bd == 8 && shift == 0) {
+        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];
+      } else {
+        uint16_t *src1s = CONVERT_TO_SHORTPTR(_src1);
+        uint16_t *src2s = CONVERT_TO_SHORTPTR(_src2);
+        dst1[j * w + i] = (src1s[j0 * _s1ystride + i0] >> shift) +
+                          (src1s[j0 * _s1ystride + i1] >> shift) +
+                          (src1s[j1 * _s1ystride + i0] >> shift) +
+                          (src1s[j1 * _s1ystride + i1] >> shift);
+        dst2[j * w + i] = (src2s[j0 * _s2ystride + i0] >> shift) +
+                          (src2s[j0 * _s2ystride + i1] >> shift) +
+                          (src2s[j1 * _s2ystride + i0] >> shift) +
+                          (src2s[j1 * _s2ystride + i1] >> shift);
+      }
+    }
+  }
+}
+
+static void fs_apply_luminance(fs_ctx *_ctx, int _l, int bit_depth) {
+  unsigned *col_sums_x;
+  unsigned *col_sums_y;
+  uint32_t *im1;
+  uint32_t *im2;
+  double *ssim;
+  double c1;
+  int w;
+  int h;
+  int j0offs;
+  int j1offs;
+  int i;
+  int j;
+  double ssim_c1 = SSIM_C1;
+#if CONFIG_HIGHBITDEPTH
+  if (bit_depth == 10) ssim_c1 = SSIM_C1_10;
+  if (bit_depth == 12) ssim_c1 = SSIM_C1_12;
+#else
+  assert(bit_depth == 8);
+  (void)bit_depth;
+#endif
+  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, int bit_depth) {
+  uint32_t *im1;
+  uint32_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;
+  double ssim_c2 = SSIM_C2;
+#if CONFIG_HIGHBITDEPTH
+  if (bit_depth == 10) ssim_c2 = SSIM_C2_10;
+  if (bit_depth == 12) ssim_c2 = SSIM_C2_12;
+#else
+  assert(bit_depth == 8);
+  (void)bit_depth;
+#endif
+
+  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((int)im1[(j + 1) * w + i + 1] - (int)im1[j * w + i]);
+        g2 = abs((int)im1[(j + 1) * w + i] - (int)im1[j * w + i + 1]);
+        gx = 4 * FS_MAXI(g1, g2) + FS_MINI(g1, g2);
+        g1 = abs((int)im2[(j + 1) * w + i + 1] - (int)im2[j * w + i]);
+        g2 = abs((int)im2[(j + 1) * w + i] - (int)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 convert_ssim_db(double _ssim, double _weight) {
+  assert(_weight >= _ssim);
+  if ((_weight - _ssim) < 1e-10) return MAX_SSIM_DB;
+  return 10 * (log10(_weight) - log10(_weight - _ssim));
+}
+
+static double calc_ssim(const uint8_t *_src, int _systride, const uint8_t *_dst,
+                        int _dystride, int _w, int _h, uint32_t _bd,
+                        uint32_t _shift) {
+  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, _bd,
+                       _shift);
+  for (l = 0; l < FS_NLEVELS - 1; l++) {
+    fs_calc_structure(&ctx, l, _bd);
+    ret *= fs_average(&ctx, l);
+    fs_downsample_level(&ctx, l + 1);
+  }
+  fs_calc_structure(&ctx, l, _bd);
+  fs_apply_luminance(&ctx, l, _bd);
+  ret *= fs_average(&ctx, l);
+  fs_ctx_clear(&ctx);
+  return ret;
+}
+
+double aom_calc_fastssim(const YV12_BUFFER_CONFIG *source,
+                         const YV12_BUFFER_CONFIG *dest, double *ssim_y,
+                         double *ssim_u, double *ssim_v, uint32_t bd,
+                         uint32_t in_bd) {
+  double ssimv;
+  uint32_t bd_shift = 0;
+  aom_clear_system_state();
+  assert(bd >= in_bd);
+
+  bd_shift = bd - in_bd;
+
+  *ssim_y = calc_ssim(source->y_buffer, source->y_stride, dest->y_buffer,
+                      dest->y_stride, source->y_crop_width,
+                      source->y_crop_height, in_bd, bd_shift);
+  *ssim_u = calc_ssim(source->u_buffer, source->uv_stride, dest->u_buffer,
+                      dest->uv_stride, source->uv_crop_width,
+                      source->uv_crop_height, in_bd, bd_shift);
+  *ssim_v = calc_ssim(source->v_buffer, source->uv_stride, dest->v_buffer,
+                      dest->uv_stride, source->uv_crop_width,
+                      source->uv_crop_height, in_bd, bd_shift);
+  ssimv = (*ssim_y) * .8 + .1 * ((*ssim_u) + (*ssim_v));
+  return convert_ssim_db(ssimv, 1.0);
+}