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FFmpeg/libavfilter/vf_ssim.c
Andreas Rheinhardt 790f793844 avutil/common: Don't auto-include mem.h 
There are lots of files that don't need it: The number of object
files that actually need it went down from 2011 to 884 here.

Keep it for external users in order to not cause breakages.

Also improve the other headers a bit while just at it.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-31 00:08:43 +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/file_open.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#include "drawutils.h"
#include "framesync.h"
#include "internal.h"
#include "ssim.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];
}
if (master->color_range != ref->color_range) {
av_log(ctx, AV_LOG_WARNING, "master and reference "
"frames use different color ranges (%s != %s)\n",
av_color_range_name(master->color_range),
av_color_range_name(ref->color_range));
}
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 = avpriv_fopen_utf8(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);
#endif
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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