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FFmpeg/libavfilter/vf_ssim.c
Anton Khirnov b9c928a486 avfilter: add AVFILTER_FLAG_METADATA_ONLY 
This flag allows distinguishing between filters that actually modify the
data and those that only modify metadata or gather some stream
information.
2021-12-04 14:07:19 +01:00

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/*
* 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
* Calculate the SSIM between two input videos.
*/
#include "libavutil/avstring.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "drawutils.h"
#include "formats.h"
#include "framesync.h"
#include "internal.h"
#include "ssim.h"
#include "video.h"
typedef struct SSIMContext {
const AVClass *class;
FFFrameSync fs;
FILE *stats_file;
char *stats_file_str;
int nb_components;
int nb_threads;
int max;
uint64_t nb_frames;
double ssim[4], ssim_total;
char comps[4];
double coefs[4];
uint8_t rgba_map[4];
int planewidth[4];
int planeheight[4];
int **temp;
int is_rgb;
double **score;
int (*ssim_plane)(AVFilterContext *ctx, void *arg,
int jobnr, int nb_jobs);
SSIMDSPContext dsp;
} 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 }
};
FRAMESYNC_DEFINE_CLASS(ssim, SSIMContext, fs);
static void set_meta(AVDictionary **metadata, const char *key, char comp, float d)
{
char value[128];
snprintf(value, sizeof(value), "%f", 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_4x4xn_16bit(const uint8_t *main8, ptrdiff_t main_stride,
const uint8_t *ref8, ptrdiff_t ref_stride,
int64_t (*sums)[4], int width)
{
const uint16_t *main16 = (const uint16_t *)main8;
const uint16_t *ref16 = (const uint16_t *)ref8;
int x, y, z;
main_stride >>= 1;
ref_stride >>= 1;
for (z = 0; z < width; z++) {
uint64_t s1 = 0, s2 = 0, ss = 0, s12 = 0;
for (y = 0; y < 4; y++) {
for (x = 0; x < 4; x++) {
unsigned a = main16[x + y * main_stride];
unsigned b = ref16[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;
main16 += 4;
ref16 += 4;
}
}
static void ssim_4x4xn_8bit(const uint8_t *main, ptrdiff_t main_stride,
const uint8_t *ref, ptrdiff_t ref_stride,
int (*sums)[4], int width)
{
int x, y, z;
for (z = 0; z < width; 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_end1x(int64_t s1, int64_t s2, int64_t ss, int64_t s12, int max)
{
int64_t ssim_c1 = (int64_t)(.01*.01*max*max*64 + .5);
int64_t ssim_c2 = (int64_t)(.03*.03*max*max*64*63 + .5);
int64_t fs1 = s1;
int64_t fs2 = s2;
int64_t fss = ss;
int64_t fs12 = s12;
int64_t vars = fss * 64 - fs1 * fs1 - fs2 * fs2;
int64_t 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_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_endn_16bit(const int64_t (*sum0)[4], const int64_t (*sum1)[4], int width, int max)
{
float ssim = 0.0;
int i;
for (i = 0; i < width; i++)
ssim += ssim_end1x(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],
max);
return ssim;
}
static double ssim_endn_8bit(const int (*sum0)[4], const int (*sum1)[4], int width)
{
double 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;
}
#define SUM_LEN(w) (((w) >> 2) + 3)
typedef struct ThreadData {
const uint8_t *main_data[4];
const uint8_t *ref_data[4];
int main_linesize[4];
int ref_linesize[4];
int planewidth[4];
int planeheight[4];
double **score;
int **temp;
int nb_components;
int max;
SSIMDSPContext *dsp;
} ThreadData;
static int ssim_plane_16bit(AVFilterContext *ctx, void *arg,
int jobnr, int nb_jobs)
{
ThreadData *td = arg;
double *score = td->score[jobnr];
void *temp = td->temp[jobnr];
const int max = td->max;
for (int c = 0; c < td->nb_components; c++) {
const uint8_t *main_data = td->main_data[c];
const uint8_t *ref_data = td->ref_data[c];
const int main_stride = td->main_linesize[c];
const int ref_stride = td->ref_linesize[c];
int width = td->planewidth[c];
int height = td->planeheight[c];
const int slice_start = ((height >> 2) * jobnr) / nb_jobs;
const int slice_end = ((height >> 2) * (jobnr+1)) / nb_jobs;
const int ystart = FFMAX(1, slice_start);
int z = ystart - 1;
double ssim = 0.0;
int64_t (*sum0)[4] = temp;
int64_t (*sum1)[4] = sum0 + SUM_LEN(width);
width >>= 2;
height >>= 2;
for (int y = ystart; y < slice_end; y++) {
for (; z <= y; z++) {
FFSWAP(void*, sum0, sum1);
ssim_4x4xn_16bit(&main_data[4 * z * main_stride], main_stride,
&ref_data[4 * z * ref_stride], ref_stride,
sum0, width);
}
ssim += ssim_endn_16bit((const int64_t (*)[4])sum0, (const int64_t (*)[4])sum1, width - 1, max);
}
score[c] = ssim;
}
return 0;
}
static int ssim_plane(AVFilterContext *ctx, void *arg,
int jobnr, int nb_jobs)
{
ThreadData *td = arg;
double *score = td->score[jobnr];
void *temp = td->temp[jobnr];
SSIMDSPContext *dsp = td->dsp;
for (int c = 0; c < td->nb_components; c++) {
const uint8_t *main_data = td->main_data[c];
const uint8_t *ref_data = td->ref_data[c];
const int main_stride = td->main_linesize[c];
const int ref_stride = td->ref_linesize[c];
int width = td->planewidth[c];
int height = td->planeheight[c];
const int slice_start = ((height >> 2) * jobnr) / nb_jobs;
const int slice_end = ((height >> 2) * (jobnr+1)) / nb_jobs;
const int ystart = FFMAX(1, slice_start);
int z = ystart - 1;
double ssim = 0.0;
int (*sum0)[4] = temp;
int (*sum1)[4] = sum0 + SUM_LEN(width);
width >>= 2;
height >>= 2;
for (int y = ystart; y < slice_end; y++) {
for (; z <= y; z++) {
FFSWAP(void*, sum0, sum1);
dsp->ssim_4x4_line(&main_data[4 * z * main_stride], main_stride,
&ref_data[4 * z * ref_stride], ref_stride,
sum0, width);
}
ssim += dsp->ssim_end_line((const int (*)[4])sum0, (const int (*)[4])sum1, width - 1);
}
score[c] = ssim;
}
return 0;
}
static double ssim_db(double ssim, double weight)
{
return (fabs(weight - ssim) > 1e-9) ? 10.0 * log10(weight / (weight - ssim)) : INFINITY;
}
static int do_ssim(FFFrameSync *fs)
{
AVFilterContext *ctx = fs->parent;
SSIMContext *s = ctx->priv;
AVFrame *master, *ref;
AVDictionary **metadata;
double c[4] = {0}, ssimv = 0.0;
ThreadData td;
int ret, i;
ret = ff_framesync_dualinput_get(fs, &master, &ref);
if (ret < 0)
return ret;
if (ctx->is_disabled || !ref)
return ff_filter_frame(ctx->outputs[0], master);
metadata = &master->metadata;
s->nb_frames++;
td.nb_components = s->nb_components;
td.dsp = &s->dsp;
td.score = s->score;
td.temp = s->temp;
td.max = s->max;
for (int n = 0; n < s->nb_components; n++) {
td.main_data[n] = master->data[n];
td.ref_data[n] = ref->data[n];
td.main_linesize[n] = master->linesize[n];
td.ref_linesize[n] = ref->linesize[n];
td.planewidth[n] = s->planewidth[n];
td.planeheight[n] = s->planeheight[n];
}
ff_filter_execute(ctx, s->ssim_plane, &td, NULL,
FFMIN((s->planeheight[1] + 3) >> 2, s->nb_threads));
for (i = 0; i < s->nb_components; i++) {
for (int j = 0; j < s->nb_threads; j++)
c[i] += s->score[j][i];
c[i] = c[i] / (((s->planewidth[i] >> 2) - 1) * ((s->planeheight[i] >> 2) - 1));
}
for (i = 0; i < s->nb_components; i++) {
ssimv += s->coefs[i] * c[i];
s->ssim[i] += c[i];
}
for (i = 0; i < s->nb_components; i++) {
int cidx = s->is_rgb ? s->rgba_map[i] : i;
set_meta(metadata, "lavfi.ssim.", s->comps[i], c[cidx]);
}
s->ssim_total += ssimv;
set_meta(metadata, "lavfi.ssim.All", 0, ssimv);
set_meta(metadata, "lavfi.ssim.dB", 0, ssim_db(ssimv, 1.0));
if (s->stats_file) {
fprintf(s->stats_file, "n:%"PRId64" ", s->nb_frames);
for (i = 0; i < s->nb_components; i++) {
int cidx = s->is_rgb ? s->rgba_map[i] : i;
fprintf(s->stats_file, "%c:%f ", s->comps[i], c[cidx]);
}
fprintf(s->stats_file, "All:%f (%f)\n", ssimv, ssim_db(ssimv, 1.0));
}
return ff_filter_frame(ctx->outputs[0], master);
}
static av_cold int init(AVFilterContext *ctx)
{
SSIMContext *s = ctx->priv;
if (s->stats_file_str) {
if (!strcmp(s->stats_file_str, "-")) {
s->stats_file = stdout;
} else {
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->fs.on_event = do_ssim;
return 0;
}
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9, AV_PIX_FMT_GRAY10,
AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14, AV_PIX_FMT_GRAY16,
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,
#define PF(suf) AV_PIX_FMT_YUV420##suf, AV_PIX_FMT_YUV422##suf, AV_PIX_FMT_YUV444##suf, AV_PIX_FMT_GBR##suf
PF(P9), PF(P10), PF(P12), PF(P14), PF(P16),
AV_PIX_FMT_NONE
};
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 sum = 0, i;
s->nb_threads = ff_filter_get_nb_threads(ctx);
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);
}
s->is_rgb = ff_fill_rgba_map(s->rgba_map, inlink->format) >= 0;
s->comps[0] = s->is_rgb ? 'R' : 'Y';
s->comps[1] = s->is_rgb ? 'G' : 'U';
s->comps[2] = s->is_rgb ? 'B' : 'V';
s->comps[3] = 'A';
s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
s->planeheight[0] = s->planeheight[3] = inlink->h;
s->planewidth[1] = s->planewidth[2] = AV_CEIL_RSHIFT(inlink->w, desc->log2_chroma_w);
s->planewidth[0] = s->planewidth[3] = inlink->w;
for (i = 0; i < s->nb_components; i++)
sum += s->planeheight[i] * s->planewidth[i];
for (i = 0; i < s->nb_components; i++)
s->coefs[i] = (double) s->planeheight[i] * s->planewidth[i] / sum;
s->temp = av_calloc(s->nb_threads, sizeof(*s->temp));
if (!s->temp)
return AVERROR(ENOMEM);
for (int t = 0; t < s->nb_threads; t++) {
s->temp[t] = av_calloc(2 * SUM_LEN(inlink->w), (desc->comp[0].depth > 8) ? sizeof(int64_t[4]) : sizeof(int[4]));
if (!s->temp[t])
return AVERROR(ENOMEM);
}
s->max = (1 << desc->comp[0].depth) - 1;
s->ssim_plane = desc->comp[0].depth > 8 ? ssim_plane_16bit : ssim_plane;
s->dsp.ssim_4x4_line = ssim_4x4xn_8bit;
s->dsp.ssim_end_line = ssim_endn_8bit;
if (ARCH_X86)
ff_ssim_init_x86(&s->dsp);
s->score = av_calloc(s->nb_threads, sizeof(*s->score));
if (!s->score)
return AVERROR(ENOMEM);
for (int t = 0; t < s->nb_threads; t++) {
s->score[t] = av_calloc(s->nb_components, sizeof(*s->score[0]));
if (!s->score[t])
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;
ret = ff_framesync_init_dualinput(&s->fs, ctx);
if (ret < 0)
return 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_framesync_configure(&s->fs)) < 0)
return ret;
outlink->time_base = s->fs.time_base;
if (av_cmp_q(mainlink->time_base, outlink->time_base) ||
av_cmp_q(ctx->inputs[1]->time_base, outlink->time_base))
av_log(ctx, AV_LOG_WARNING, "not matching timebases found between first input: %d/%d and second input %d/%d, results may be incorrect!\n",
mainlink->time_base.num, mainlink->time_base.den,
ctx->inputs[1]->time_base.num, ctx->inputs[1]->time_base.den);
return 0;
}
static int activate(AVFilterContext *ctx)
{
SSIMContext *s = ctx->priv;
return ff_framesync_activate(&s->fs);
}
static av_cold void uninit(AVFilterContext *ctx)
{
SSIMContext *s = ctx->priv;
if (s->nb_frames > 0) {
char buf[256];
int i;
buf[0] = 0;
for (i = 0; i < s->nb_components; i++) {
int c = s->is_rgb ? s->rgba_map[i] : i;
av_strlcatf(buf, sizeof(buf), " %c:%f (%f)", s->comps[i], s->ssim[c] / s->nb_frames,
ssim_db(s->ssim[c], s->nb_frames));
}
av_log(ctx, AV_LOG_INFO, "SSIM%s All:%f (%f)\n", buf,
s->ssim_total / s->nb_frames, ssim_db(s->ssim_total, s->nb_frames));
}
ff_framesync_uninit(&s->fs);
if (s->stats_file && s->stats_file != stdout)
fclose(s->stats_file);
for (int t = 0; t < s->nb_threads && s->score; t++)
av_freep(&s->score[t]);
av_freep(&s->score);
for (int t = 0; t < s->nb_threads && s->temp; t++)
av_freep(&s->temp[t]);
av_freep(&s->temp);
}
static const AVFilterPad ssim_inputs[] = {
{
.name = "main",
.type = AVMEDIA_TYPE_VIDEO,
},{
.name = "reference",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input_ref,
},
};
static const AVFilterPad ssim_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
},
};
const AVFilter ff_vf_ssim = {
.name = "ssim",
.description = NULL_IF_CONFIG_SMALL("Calculate the SSIM between two video streams."),
.preinit = ssim_framesync_preinit,
.init = init,
.uninit = uninit,
.activate = activate,
.priv_size = sizeof(SSIMContext),
.priv_class = &ssim_class,
FILTER_INPUTS(ssim_inputs),
FILTER_OUTPUTS(ssim_outputs),
FILTER_PIXFMTS_ARRAY(pix_fmts),
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL |
AVFILTER_FLAG_SLICE_THREADS |
AVFILTER_FLAG_METADATA_ONLY,
};
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