mirror of https://git.ffmpeg.org/ffmpeg.git
400 lines
12 KiB
C
400 lines
12 KiB
C
|
/*
|
||
|
* Copyright (c) 2003-2013 Loren Merritt
|
||
|
* Copyright (c) 2015 Paul B Mahol
|
||
|
*
|
||
|
* This file is part of FFmpeg.
|
||
|
*
|
||
|
* FFmpeg is free software; you can redistribute it and/or
|
||
|
* modify it under the terms of the GNU Lesser General Public
|
||
|
* License as published by the Free Software Foundation; either
|
||
|
* version 2.1 of the License, or (at your option) any later version.
|
||
|
*
|
||
|
* FFmpeg is distributed in the hope that it will be useful,
|
||
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
|
* Lesser General Public License for more details.
|
||
|
*
|
||
|
* You should have received a copy of the GNU Lesser General Public
|
||
|
* License along with FFmpeg; if not, write to the Free Software
|
||
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
||
|
*/
|
||
|
|
||
|
/* Computes the Structural Similarity Metric between two video streams.
|
||
|
* original algorithm:
|
||
|
* Z. Wang, A. C. Bovik, H. R. Sheikh and E. P. Simoncelli,
|
||
|
* "Image quality assessment: From error visibility to structural similarity,"
|
||
|
* IEEE Transactions on Image Processing, vol. 13, no. 4, pp. 600-612, Apr. 2004.
|
||
|
*
|
||
|
* To improve speed, this implementation uses the standard approximation of
|
||
|
* overlapped 8x8 block sums, rather than the original gaussian weights.
|
||
|
*/
|
||
|
|
||
|
/*
|
||
|
* @file
|
||
|
* Caculate the SSIM between two input videos.
|
||
|
*/
|
||
|
|
||
|
#include "libavutil/opt.h"
|
||
|
#include "libavutil/pixdesc.h"
|
||
|
#include "avfilter.h"
|
||
|
#include "dualinput.h"
|
||
|
#include "drawutils.h"
|
||
|
#include "formats.h"
|
||
|
#include "internal.h"
|
||
|
#include "video.h"
|
||
|
|
||
|
typedef struct SSIMContext {
|
||
|
const AVClass *class;
|
||
|
FFDualInputContext dinput;
|
||
|
FILE *stats_file;
|
||
|
char *stats_file_str;
|
||
|
int nb_components;
|
||
|
uint64_t nb_frames;
|
||
|
double ssim[4];
|
||
|
char comps[4];
|
||
|
int *coefs;
|
||
|
uint8_t rgba_map[4];
|
||
|
int planewidth[4];
|
||
|
int planeheight[4];
|
||
|
int *temp;
|
||
|
} SSIMContext;
|
||
|
|
||
|
#define OFFSET(x) offsetof(SSIMContext, x)
|
||
|
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
|
||
|
|
||
|
static const AVOption ssim_options[] = {
|
||
|
{"stats_file", "Set file where to store per-frame difference information", OFFSET(stats_file_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
|
||
|
{"f", "Set file where to store per-frame difference information", OFFSET(stats_file_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
|
||
|
{ NULL }
|
||
|
};
|
||
|
|
||
|
AVFILTER_DEFINE_CLASS(ssim);
|
||
|
|
||
|
static int rgb_coefs[4] = { 1, 1, 1, 3};
|
||
|
static int yuv_coefs[4] = { 4, 1, 1, 6};
|
||
|
static int gray_coefs[4] = { 1, 0, 0, 1};
|
||
|
|
||
|
static void set_meta(AVDictionary **metadata, const char *key, char comp, float d)
|
||
|
{
|
||
|
char value[128];
|
||
|
snprintf(value, sizeof(value), "%0.2f", d);
|
||
|
if (comp) {
|
||
|
char key2[128];
|
||
|
snprintf(key2, sizeof(key2), "%s%c", key, comp);
|
||
|
av_dict_set(metadata, key2, value, 0);
|
||
|
} else {
|
||
|
av_dict_set(metadata, key, value, 0);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static void ssim_4x4x2_core(const uint8_t *main, int main_stride,
|
||
|
const uint8_t *ref, int ref_stride,
|
||
|
int sums[2][4])
|
||
|
{
|
||
|
int x, y, z;
|
||
|
|
||
|
for (z = 0; z < 2; z++) {
|
||
|
uint32_t s1 = 0, s2 = 0, ss = 0, s12 = 0;
|
||
|
|
||
|
for (y = 0; y < 4; y++) {
|
||
|
for (x = 0; x < 4; x++) {
|
||
|
int a = main[x + y * main_stride];
|
||
|
int b = ref[x + y * ref_stride];
|
||
|
|
||
|
s1 += a;
|
||
|
s2 += b;
|
||
|
ss += a*a;
|
||
|
ss += b*b;
|
||
|
s12 += a*b;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
sums[z][0] = s1;
|
||
|
sums[z][1] = s2;
|
||
|
sums[z][2] = ss;
|
||
|
sums[z][3] = s12;
|
||
|
main += 4;
|
||
|
ref += 4;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static float ssim_end1(int s1, int s2, int ss, int s12)
|
||
|
{
|
||
|
static const int ssim_c1 = (int)(.01*.01*255*255*64 + .5);
|
||
|
static const int ssim_c2 = (int)(.03*.03*255*255*64*63 + .5);
|
||
|
|
||
|
int fs1 = s1;
|
||
|
int fs2 = s2;
|
||
|
int fss = ss;
|
||
|
int fs12 = s12;
|
||
|
int vars = fss * 64 - fs1 * fs1 - fs2 * fs2;
|
||
|
int covar = fs12 * 64 - fs1 * fs2;
|
||
|
|
||
|
return (float)(2 * fs1 * fs2 + ssim_c1) * (float)(2 * covar + ssim_c2)
|
||
|
/ ((float)(fs1 * fs1 + fs2 * fs2 + ssim_c1) * (float)(vars + ssim_c2));
|
||
|
}
|
||
|
|
||
|
static float ssim_end4(int sum0[5][4], int sum1[5][4], int width)
|
||
|
{
|
||
|
float ssim = 0.0;
|
||
|
int i;
|
||
|
|
||
|
for( i = 0; i < width; i++ )
|
||
|
ssim += ssim_end1(sum0[i][0] + sum0[i + 1][0] + sum1[i][0] + sum1[i + 1][0],
|
||
|
sum0[i][1] + sum0[i + 1][1] + sum1[i][1] + sum1[i + 1][1],
|
||
|
sum0[i][2] + sum0[i + 1][2] + sum1[i][2] + sum1[i + 1][2],
|
||
|
sum0[i][3] + sum0[i + 1][3] + sum1[i][3] + sum1[i + 1][3]);
|
||
|
return ssim;
|
||
|
}
|
||
|
|
||
|
static float ssim_plane(uint8_t *main, int main_stride,
|
||
|
uint8_t *ref, int ref_stride,
|
||
|
int width, int height, void *temp)
|
||
|
{
|
||
|
int z = 0;
|
||
|
int x, y;
|
||
|
float ssim = 0.0;
|
||
|
int (*sum0)[4] = temp;
|
||
|
int (*sum1)[4] = sum0 + (width >> 2) + 3;
|
||
|
|
||
|
width >>= 2;
|
||
|
height >>= 2;
|
||
|
|
||
|
for (y = 1; y < height; y++) {
|
||
|
for (; z <= y; z++) {
|
||
|
FFSWAP(void*, sum0, sum1);
|
||
|
for (x = 0; x < width; x+=2)
|
||
|
ssim_4x4x2_core(&main[4 * (x + z * main_stride)], main_stride,
|
||
|
&ref[4 * (x + z * ref_stride)], ref_stride,
|
||
|
&sum0[x]);
|
||
|
}
|
||
|
|
||
|
for (x = 0; x < width - 1; x += 4)
|
||
|
ssim += ssim_end4(sum0 + x, sum1 + x, FFMIN(4, width - x - 1));
|
||
|
}
|
||
|
|
||
|
return ssim / ((height - 1) * (width - 1));
|
||
|
}
|
||
|
|
||
|
static double ssim_db(double ssim, double weight)
|
||
|
{
|
||
|
return 10 * (log(weight) / log(10) - log(weight - ssim) / log(10));
|
||
|
}
|
||
|
|
||
|
static AVFrame *do_ssim(AVFilterContext *ctx, AVFrame *main,
|
||
|
const AVFrame *ref)
|
||
|
{
|
||
|
AVDictionary **metadata = avpriv_frame_get_metadatap(main);
|
||
|
SSIMContext *s = ctx->priv;
|
||
|
float c[4], ssimv;
|
||
|
int i;
|
||
|
|
||
|
s->nb_frames++;
|
||
|
|
||
|
for (i = 0; i < s->nb_components; i++)
|
||
|
c[i] = ssim_plane(main->data[i], main->linesize[i],
|
||
|
ref->data[i], ref->linesize[i],
|
||
|
s->planewidth[i], s->planeheight[i], s->temp);
|
||
|
|
||
|
ssimv = (c[0] * s->coefs[0] + c[1] * s->coefs[1] + c[2] * s->coefs[2]) / s->coefs[3];
|
||
|
|
||
|
for (i = 0; i < s->nb_components; i++)
|
||
|
set_meta(metadata, "lavfi.ssim.", s->comps[i], c[i]);
|
||
|
|
||
|
set_meta(metadata, "lavfi.ssim.All", 0, ssimv);
|
||
|
set_meta(metadata, "lavfi.ssim.dB", 0, ssim_db(c[0] * s->coefs[0] + c[1] * s->coefs[1] + c[2] * s->coefs[2], s->coefs[3]));
|
||
|
|
||
|
if (s->stats_file) {
|
||
|
fprintf(s->stats_file, "n:%"PRId64" ", s->nb_frames);
|
||
|
|
||
|
for (i = 0; i < s->nb_components; i++)
|
||
|
fprintf(s->stats_file, "%c:%f ", s->comps[i], c[i]);
|
||
|
|
||
|
fprintf(s->stats_file, "All:%f (%f)\n", ssimv, ssim_db(c[0] * s->coefs[0] + c[1] * s->coefs[1] + c[2] * s->coefs[2], s->coefs[3]));
|
||
|
}
|
||
|
|
||
|
s->ssim[0] += c[0];
|
||
|
s->ssim[1] += c[1];
|
||
|
s->ssim[2] += c[2];
|
||
|
|
||
|
return main;
|
||
|
}
|
||
|
|
||
|
static av_cold int init(AVFilterContext *ctx)
|
||
|
{
|
||
|
SSIMContext *s = ctx->priv;
|
||
|
|
||
|
if (s->stats_file_str) {
|
||
|
s->stats_file = fopen(s->stats_file_str, "w");
|
||
|
if (!s->stats_file) {
|
||
|
int err = AVERROR(errno);
|
||
|
char buf[128];
|
||
|
av_strerror(err, buf, sizeof(buf));
|
||
|
av_log(ctx, AV_LOG_ERROR, "Could not open stats file %s: %s\n",
|
||
|
s->stats_file_str, buf);
|
||
|
return err;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
s->dinput.process = do_ssim;
|
||
|
s->dinput.shortest = 1;
|
||
|
s->dinput.repeatlast = 0;
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int query_formats(AVFilterContext *ctx)
|
||
|
{
|
||
|
static const enum AVPixelFormat pix_fmts[] = {
|
||
|
AV_PIX_FMT_GRAY8,
|
||
|
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P,
|
||
|
AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
|
||
|
AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P,
|
||
|
AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ444P,
|
||
|
AV_PIX_FMT_GBRP,
|
||
|
AV_PIX_FMT_NONE
|
||
|
};
|
||
|
|
||
|
AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
|
||
|
if (!fmts_list)
|
||
|
return AVERROR(ENOMEM);
|
||
|
return ff_set_common_formats(ctx, fmts_list);
|
||
|
}
|
||
|
|
||
|
static int config_input_ref(AVFilterLink *inlink)
|
||
|
{
|
||
|
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
|
||
|
AVFilterContext *ctx = inlink->dst;
|
||
|
SSIMContext *s = ctx->priv;
|
||
|
int is_rgb;
|
||
|
|
||
|
s->nb_components = desc->nb_components;
|
||
|
|
||
|
if (ctx->inputs[0]->w != ctx->inputs[1]->w ||
|
||
|
ctx->inputs[0]->h != ctx->inputs[1]->h) {
|
||
|
av_log(ctx, AV_LOG_ERROR, "Width and height of input videos must be same.\n");
|
||
|
return AVERROR(EINVAL);
|
||
|
}
|
||
|
if (ctx->inputs[0]->format != ctx->inputs[1]->format) {
|
||
|
av_log(ctx, AV_LOG_ERROR, "Inputs must be of same pixel format.\n");
|
||
|
return AVERROR(EINVAL);
|
||
|
}
|
||
|
|
||
|
is_rgb = ff_fill_rgba_map(s->rgba_map, inlink->format) >= 0;
|
||
|
s->comps[0] = is_rgb ? 'R' : 'Y';
|
||
|
s->comps[1] = is_rgb ? 'G' : 'U';
|
||
|
s->comps[2] = is_rgb ? 'B' : 'V';
|
||
|
s->comps[3] = 'A';
|
||
|
|
||
|
if (is_rgb) {
|
||
|
s->coefs = rgb_coefs;
|
||
|
} else if (s->nb_components == 1) {
|
||
|
s->coefs = gray_coefs;
|
||
|
} else {
|
||
|
s->coefs = yuv_coefs;
|
||
|
}
|
||
|
|
||
|
s->planeheight[1] = s->planeheight[2] = FF_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
|
||
|
s->planeheight[0] = s->planeheight[3] = inlink->h;
|
||
|
s->planewidth[1] = s->planewidth[2] = FF_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
|
||
|
s->planewidth[0] = s->planewidth[3] = inlink->w;
|
||
|
|
||
|
s->temp = av_malloc((2 * inlink->w + 12) * sizeof(*s->temp));
|
||
|
if (!s->temp)
|
||
|
return AVERROR(ENOMEM);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int config_output(AVFilterLink *outlink)
|
||
|
{
|
||
|
AVFilterContext *ctx = outlink->src;
|
||
|
SSIMContext *s = ctx->priv;
|
||
|
AVFilterLink *mainlink = ctx->inputs[0];
|
||
|
int ret;
|
||
|
|
||
|
outlink->w = mainlink->w;
|
||
|
outlink->h = mainlink->h;
|
||
|
outlink->time_base = mainlink->time_base;
|
||
|
outlink->sample_aspect_ratio = mainlink->sample_aspect_ratio;
|
||
|
outlink->frame_rate = mainlink->frame_rate;
|
||
|
|
||
|
if ((ret = ff_dualinput_init(ctx, &s->dinput)) < 0)
|
||
|
return ret;
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
|
||
|
{
|
||
|
SSIMContext *s = inlink->dst->priv;
|
||
|
return ff_dualinput_filter_frame(&s->dinput, inlink, buf);
|
||
|
}
|
||
|
|
||
|
static int request_frame(AVFilterLink *outlink)
|
||
|
{
|
||
|
SSIMContext *s = outlink->src->priv;
|
||
|
return ff_dualinput_request_frame(&s->dinput, outlink);
|
||
|
}
|
||
|
|
||
|
static av_cold void uninit(AVFilterContext *ctx)
|
||
|
{
|
||
|
SSIMContext *s = ctx->priv;
|
||
|
|
||
|
if (s->nb_frames > 0) {
|
||
|
if (s->nb_components == 3) {
|
||
|
av_log(ctx, AV_LOG_INFO, "SSIM %c:%f %c:%f %c:%f All:%f (%f)\n",
|
||
|
s->comps[0], s->ssim[0] / s->nb_frames,
|
||
|
s->comps[1], s->ssim[1] / s->nb_frames,
|
||
|
s->comps[2], s->ssim[2] / s->nb_frames,
|
||
|
(s->ssim[0] * 4 + s->ssim[1] + s->ssim[2]) / (s->nb_frames * 6),
|
||
|
ssim_db(s->ssim[0] * 4 + s->ssim[1] + s->ssim[2], s->nb_frames * 6));
|
||
|
} else if (s->nb_components == 1) {
|
||
|
av_log(ctx, AV_LOG_INFO, "SSIM All:%f (%f)\n",
|
||
|
s->ssim[0] / s->nb_frames, ssim_db(s->ssim[0], s->nb_frames));
|
||
|
}
|
||
|
}
|
||
|
|
||
|
ff_dualinput_uninit(&s->dinput);
|
||
|
|
||
|
if (s->stats_file)
|
||
|
fclose(s->stats_file);
|
||
|
|
||
|
av_freep(&s->temp);
|
||
|
}
|
||
|
|
||
|
static const AVFilterPad ssim_inputs[] = {
|
||
|
{
|
||
|
.name = "main",
|
||
|
.type = AVMEDIA_TYPE_VIDEO,
|
||
|
.filter_frame = filter_frame,
|
||
|
},{
|
||
|
.name = "reference",
|
||
|
.type = AVMEDIA_TYPE_VIDEO,
|
||
|
.filter_frame = filter_frame,
|
||
|
.config_props = config_input_ref,
|
||
|
},
|
||
|
{ NULL }
|
||
|
};
|
||
|
|
||
|
static const AVFilterPad ssim_outputs[] = {
|
||
|
{
|
||
|
.name = "default",
|
||
|
.type = AVMEDIA_TYPE_VIDEO,
|
||
|
.config_props = config_output,
|
||
|
.request_frame = request_frame,
|
||
|
},
|
||
|
{ NULL }
|
||
|
};
|
||
|
|
||
|
AVFilter ff_vf_ssim = {
|
||
|
.name = "ssim",
|
||
|
.description = NULL_IF_CONFIG_SMALL("Calculate the SSIM between two video streams."),
|
||
|
.init = init,
|
||
|
.uninit = uninit,
|
||
|
.query_formats = query_formats,
|
||
|
.priv_size = sizeof(SSIMContext),
|
||
|
.priv_class = &ssim_class,
|
||
|
.inputs = ssim_inputs,
|
||
|
.outputs = ssim_outputs,
|
||
|
};
|