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Diffstat (limited to '')
-rw-r--r-- | third_party/aom/aom_dsp/fastssim.c | 488 |
1 files changed, 488 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 0000000000..0ef0590e89 --- /dev/null +++ b/third_party/aom/aom_dsp/fastssim.c @@ -0,0 +1,488 @@ +/* + * 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 "config/aom_config.h" +#include "config/aom_dsp_rtcd.h" + +#include "aom_dsp/ssim.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) +#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) +#define MAX_SSIM_DB 100.0 + +#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 int 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); + if (!data) return -1; + _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; + return 0; +} + +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 shift, + int buf_is_hbd) { + 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 (!buf_is_hbd) { + 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 (bit_depth == 10) ssim_c1 = SSIM_C1_10; + if (bit_depth == 12) ssim_c1 = SSIM_C1_12; + + 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 (bit_depth == 10) ssim_c2 = SSIM_C2_10; + if (bit_depth == 12) ssim_c2 = SSIM_C2_12; + + 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, int buf_is_hbd) { + fs_ctx ctx; + double ret; + int l; + ret = 1; + if (fs_ctx_init(&ctx, _w, _h, FS_NLEVELS)) return 99.0; + fs_downsample_level0(&ctx, _src, _systride, _dst, _dystride, _w, _h, _shift, + buf_is_hbd); + 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; + assert(bd >= in_bd); + assert(source->flags == dest->flags); + int buf_is_hbd = source->flags & YV12_FLAG_HIGHBITDEPTH; + 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, buf_is_hbd); + *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, buf_is_hbd); + *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, buf_is_hbd); + ssimv = (*ssim_y) * .8 + .1 * ((*ssim_u) + (*ssim_v)); + return convert_ssim_db(ssimv, 1.0); +} |