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avfilter: add msad video filter

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This commit is contained in:
Paul B Mahol 2021-03-03 19:31:38 +01:00
parent 4a69cd4e4e
commit 17127f81c5
5 changed files with 122 additions and 18 deletions
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1
Changelog
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@ -80,6 +80,7 @@ version <next>:
- Digital Pictures SGA demuxer and decoders
- TTML subtitle encoder and muxer
- identity video filter
- msad video filter
version 4.3:

21
doc/filters.texi
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@ -14903,6 +14903,27 @@ Default value for @option{hi} is 64*12, default value for @option{lo} is
64*5, and default value for @option{frac} is 0.33.
@end table
@section msad
Obtain the MSAD (Mean Sum of Absolute Differences) between two input videos.
This filter takes two input videos.
Both input videos must have the same resolution and pixel format for
this filter to work correctly. Also it assumes that both inputs
have the same number of frames, which are compared one by one.
The obtained per component, average, min and max MSAD is printed through
the logging system.
The filter stores the calculated MSAD of each frame in frame metadata.
In the below example the input file @file{main.mpg} being processed is compared
with the reference file @file{ref.mpg}.
@example
ffmpeg -i main.mpg -i ref.mpg -lavfi msad -f null -
@end example
@section negate

1
libavfilter/allfilters.c
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@ -320,6 +320,7 @@ extern AVFilter ff_vf_minterpolate;
extern AVFilter ff_vf_mix;
extern AVFilter ff_vf_monochrome;
extern AVFilter ff_vf_mpdecimate;
extern AVFilter ff_vf_msad;
extern AVFilter ff_vf_negate;
extern AVFilter ff_vf_nlmeans;
extern AVFilter ff_vf_nlmeans_opencl;

2
libavfilter/version.h
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@ -30,7 +30,7 @@
#include "libavutil/version.h"
#define LIBAVFILTER_VERSION_MAJOR 7
#define LIBAVFILTER_VERSION_MINOR 108
#define LIBAVFILTER_VERSION_MINOR 109
#define LIBAVFILTER_VERSION_MICRO 100

115
libavfilter/vf_identity.c
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@ -32,6 +32,7 @@
#include "framesync.h"
#include "internal.h"
#include "video.h"
#include "scene_sad.h"
typedef struct IdentityContext {
const AVClass *class;
@ -39,7 +40,9 @@ typedef struct IdentityContext {
double score, min_score, max_score, score_comp[4];
uint64_t nb_frames;
int is_rgb;
int is_msad;
uint8_t rgba_map[4];
int max[4];
char comps[4];
int nb_components;
int nb_threads;
@ -47,17 +50,14 @@ typedef struct IdentityContext {
int planeheight[4];
uint64_t **scores;
unsigned (*filter_line)(const uint8_t *buf, const uint8_t *ref, int w);
int (*filter_slice)(AVFilterContext *ctx, void *arg,
int jobnr, int nb_jobs);
ff_scene_sad_fn sad;
} IdentityContext;
#define OFFSET(x) offsetof(IdentityContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption identity_options[] = {
{ NULL }
};
FRAMESYNC_DEFINE_CLASS(identity, IdentityContext, fs);
static unsigned identity_line_8bit(const uint8_t *main_line, const uint8_t *ref_line, int outw)
{
unsigned score = 0;
@ -91,6 +91,34 @@ typedef struct ThreadData {
int nb_components;
} ThreadData;
static
int compute_images_msad(AVFilterContext *ctx, void *arg,
int jobnr, int nb_jobs)
{
IdentityContext *s = ctx->priv;
ThreadData *td = arg;
uint64_t *score = td->score[jobnr];
for (int c = 0; c < td->nb_components; c++) {
const int outw = td->planewidth[c];
const int outh = td->planeheight[c];
const int slice_start = (outh * jobnr) / nb_jobs;
const int slice_end = (outh * (jobnr+1)) / nb_jobs;
const int ref_linesize = td->ref_linesize[c];
const int main_linesize = td->main_linesize[c];
const uint8_t *main_line = td->main_data[c] + main_linesize * slice_start;
const uint8_t *ref_line = td->ref_data[c] + ref_linesize * slice_start;
uint64_t m = 0;
s->sad(main_line, main_linesize, ref_line, ref_linesize,
outw, slice_end - slice_start, &m);
score[c] = m;
}
return 0;
}
static
int compute_images_identity(AVFilterContext *ctx, void *arg,
int jobnr, int nb_jobs)
@ -121,16 +149,21 @@ int compute_images_identity(AVFilterContext *ctx, void *arg,
return 0;
}
static void set_meta(AVDictionary **metadata, const char *key, char comp, float d)
static void set_meta(AVFilterContext *ctx,
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);
snprintf(key2, sizeof(key2), "lavfi.%s.%s%s%c",
ctx->filter->name, ctx->filter->name, key, comp);
av_dict_set(metadata, key2, value, 0);
} else {
av_dict_set(metadata, key, value, 0);
char key2[128];
snprintf(key2, sizeof(key2), "lavfi.%s.%s%s",
ctx->filter->name, ctx->filter->name, key);
av_dict_set(metadata, key2, value, 0);
}
}
@ -139,7 +172,7 @@ static int do_identity(FFFrameSync *fs)
AVFilterContext *ctx = fs->parent;
IdentityContext *s = ctx->priv;
AVFrame *master, *ref;
double comp_identity[4], score = 0.;
double comp_score[4], score = 0.;
uint64_t comp_sum[4] = { 0 };
AVDictionary **metadata;
ThreadData td;
@ -163,7 +196,7 @@ static int do_identity(FFFrameSync *fs)
td.planeheight[c] = s->planeheight[c];
}
ctx->internal->execute(ctx, compute_images_identity, &td, NULL, FFMIN(s->planeheight[1], s->nb_threads));
ctx->internal->execute(ctx, s->filter_slice, &td, NULL, FFMIN(s->planeheight[1], s->nb_threads));
for (int j = 0; j < s->nb_threads; j++) {
for (int c = 0; c < s->nb_components; c++)
@ -171,10 +204,13 @@ static int do_identity(FFFrameSync *fs)
}
for (int c = 0; c < s->nb_components; c++)
comp_identity[c] = comp_sum[c] / ((double)s->planewidth[c] * s->planeheight[c]);
comp_score[c] = comp_sum[c] / ((double)s->planewidth[c] * s->planeheight[c]);
for (int c = 0; c < s->nb_components && s->is_msad; c++)
comp_score[c] /= (double)s->max[c];
for (int c = 0; c < s->nb_components; c++)
score += comp_identity[c];
score += comp_score[c];
score /= s->nb_components;
s->min_score = FFMIN(s->min_score, score);
@ -183,14 +219,14 @@ static int do_identity(FFFrameSync *fs)
s->score += score;
for (int j = 0; j < s->nb_components; j++)
s->score_comp[j] += comp_identity[j];
s->score_comp[j] += comp_score[j];
s->nb_frames++;
for (int j = 0; j < s->nb_components; j++) {
int c = s->is_rgb ? s->rgba_map[j] : j;
set_meta(metadata, "lavfi.identity.identity.", s->comps[j], comp_identity[c]);
set_meta(ctx, metadata, ".", s->comps[j], comp_score[c]);
}
set_meta(metadata, "lavfi.identity.identity_avg", 0, score);
set_meta(ctx, metadata, "_avg", 0, score);
return ff_filter_frame(ctx->outputs[0], master);
}
@ -269,8 +305,19 @@ static int config_input_ref(AVFilterLink *inlink)
s->min_score = +INFINITY;
s->max_score = -INFINITY;
s->max[0] = (1 << desc->comp[0].depth) - 1;
s->max[1] = (1 << desc->comp[1].depth) - 1;
s->max[2] = (1 << desc->comp[2].depth) - 1;
s->max[3] = (1 << desc->comp[3].depth) - 1;
s->is_msad = !strcmp(ctx->filter->name, "msad");
s->filter_slice = !s->is_msad ? compute_images_identity : compute_images_msad;
s->filter_line = desc->comp[0].depth > 8 ? identity_line_16bit : identity_line_8bit;
s->sad = ff_scene_sad_get_fn(desc->comp[0].depth <= 8 ? 8 : 16);
if (!s->sad)
return AVERROR(EINVAL);
return 0;
}
@ -322,7 +369,8 @@ static av_cold void uninit(AVFilterContext *ctx)
av_strlcatf(buf, sizeof(buf), " %c:%f", s->comps[j], s->score_comp[c] / s->nb_frames);
}
av_log(ctx, AV_LOG_INFO, "Identity%s average:%f min:%f max:%f\n",
av_log(ctx, AV_LOG_INFO, "%s%s average:%f min:%f max:%f\n",
ctx->filter->name,
buf,
s->score / s->nb_frames,
s->min_score,
@ -356,6 +404,15 @@ static const AVFilterPad identity_outputs[] = {
{ NULL }
};
static const AVOption options[] = {
{ NULL }
};
#if CONFIG_IDENTITY_FILTER
#define identity_options options
FRAMESYNC_DEFINE_CLASS(identity, IdentityContext, fs);
AVFilter ff_vf_identity = {
.name = "identity",
.description = NULL_IF_CONFIG_SMALL("Calculate the Identity between two video streams."),
@ -370,3 +427,27 @@ AVFilter ff_vf_identity = {
.outputs = identity_outputs,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL | AVFILTER_FLAG_SLICE_THREADS,
};
#endif /* CONFIG_IDENTITY_FILTER */
#if CONFIG_MSAD_FILTER
#define msad_options options
FRAMESYNC_DEFINE_CLASS(msad, IdentityContext, fs);
AVFilter ff_vf_msad = {
.name = "msad",
.description = NULL_IF_CONFIG_SMALL("Calculate the MSAD between two video streams."),
.preinit = msad_framesync_preinit,
.init = init,
.uninit = uninit,
.query_formats = query_formats,
.activate = activate,
.priv_size = sizeof(IdentityContext),
.priv_class = &msad_class,
.inputs = identity_inputs,
.outputs = identity_outputs,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL | AVFILTER_FLAG_SLICE_THREADS,
};
#endif /* CONFIG_MSAD_FILTER */