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FFmpeg/libavfilter/vf_blackdetect.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

257 lines
9.5 KiB
C

/*
* Copyright (c) 2012 Stefano Sabatini
*
* 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
*/
/**
* @file
* Video black detector, loosely based on blackframe with extended
* syntax and features
*/
#include <float.h>
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/timestamp.h"
#include "avfilter.h"
#include "internal.h"
#include "video.h"
typedef struct BlackDetectContext {
const AVClass *class;
double black_min_duration_time; ///< minimum duration of detected black, in seconds
int64_t black_min_duration; ///< minimum duration of detected black, expressed in timebase units
int64_t black_start; ///< pts start time of the first black picture
int64_t black_end; ///< pts end time of the last black picture
int64_t last_picref_pts; ///< pts of the last input picture
int black_started;
double picture_black_ratio_th;
double pixel_black_th;
unsigned int pixel_black_th_i;
unsigned int nb_black_pixels; ///< number of black pixels counted so far
AVRational time_base;
int depth;
int nb_threads;
unsigned int *counter;
} BlackDetectContext;
#define OFFSET(x) offsetof(BlackDetectContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
static const AVOption blackdetect_options[] = {
{ "d", "set minimum detected black duration in seconds", OFFSET(black_min_duration_time), AV_OPT_TYPE_DOUBLE, {.dbl=2}, 0, DBL_MAX, FLAGS },
{ "black_min_duration", "set minimum detected black duration in seconds", OFFSET(black_min_duration_time), AV_OPT_TYPE_DOUBLE, {.dbl=2}, 0, DBL_MAX, FLAGS },
{ "picture_black_ratio_th", "set the picture black ratio threshold", OFFSET(picture_black_ratio_th), AV_OPT_TYPE_DOUBLE, {.dbl=.98}, 0, 1, FLAGS },
{ "pic_th", "set the picture black ratio threshold", OFFSET(picture_black_ratio_th), AV_OPT_TYPE_DOUBLE, {.dbl=.98}, 0, 1, FLAGS },
{ "pixel_black_th", "set the pixel black threshold", OFFSET(pixel_black_th), AV_OPT_TYPE_DOUBLE, {.dbl=.10}, 0, 1, FLAGS },
{ "pix_th", "set the pixel black threshold", OFFSET(pixel_black_th), AV_OPT_TYPE_DOUBLE, {.dbl=.10}, 0, 1, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(blackdetect);
#define YUVJ_FORMATS \
AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P
static const enum AVPixelFormat yuvj_formats[] = {
YUVJ_FORMATS, AV_PIX_FMT_NONE
};
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_GRAY8,
AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
AV_PIX_FMT_NV12, AV_PIX_FMT_NV21,
YUVJ_FORMATS,
AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14,
AV_PIX_FMT_GRAY16,
AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
AV_PIX_FMT_YUV440P10,
AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV420P12,
AV_PIX_FMT_YUV440P12,
AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV420P14,
AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,
AV_PIX_FMT_YUVA444P9, AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA444P12, AV_PIX_FMT_YUVA444P16,
AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA422P16,
AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA420P16,
AV_PIX_FMT_NONE
};
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
BlackDetectContext *s = ctx->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
const int depth = desc->comp[0].depth;
s->depth = depth;
s->nb_threads = ff_filter_get_nb_threads(ctx);
s->time_base = inlink->time_base;
s->black_min_duration = s->black_min_duration_time / av_q2d(s->time_base);
s->counter = av_calloc(s->nb_threads, sizeof(*s->counter));
if (!s->counter)
return AVERROR(ENOMEM);
av_log(s, AV_LOG_VERBOSE,
"black_min_duration:%s pixel_black_th:%f picture_black_ratio_th:%f\n",
av_ts2timestr(s->black_min_duration, &s->time_base),
s->pixel_black_th, s->picture_black_ratio_th);
return 0;
}
static void check_black_end(AVFilterContext *ctx)
{
BlackDetectContext *s = ctx->priv;
if ((s->black_end - s->black_start) >= s->black_min_duration) {
av_log(s, AV_LOG_INFO,
"black_start:%s black_end:%s black_duration:%s\n",
av_ts2timestr(s->black_start, &s->time_base),
av_ts2timestr(s->black_end, &s->time_base),
av_ts2timestr(s->black_end - s->black_start, &s->time_base));
}
}
static int black_counter(AVFilterContext *ctx, void *arg,
int jobnr, int nb_jobs)
{
BlackDetectContext *s = ctx->priv;
const unsigned int threshold = s->pixel_black_th_i;
unsigned int *counterp = &s->counter[jobnr];
AVFrame *in = arg;
const int linesize = in->linesize[0];
const int w = in->width;
const int h = in->height;
const int start = (h * jobnr) / nb_jobs;
const int end = (h * (jobnr+1)) / nb_jobs;
const int size = end - start;
unsigned int counter = 0;
if (s->depth == 8) {
const uint8_t *p = in->data[0] + start * linesize;
for (int i = 0; i < size; i++) {
for (int x = 0; x < w; x++)
counter += p[x] <= threshold;
p += linesize;
}
} else {
const uint16_t *p = (const uint16_t *)(in->data[0] + start * linesize);
for (int i = 0; i < size; i++) {
for (int x = 0; x < w; x++)
counter += p[x] <= threshold;
p += linesize / 2;
}
}
*counterp = counter;
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *picref)
{
AVFilterContext *ctx = inlink->dst;
BlackDetectContext *s = ctx->priv;
double picture_black_ratio = 0;
const int max = (1 << s->depth) - 1;
const int factor = (1 << (s->depth - 8));
const int full = picref->color_range == AVCOL_RANGE_JPEG ||
ff_fmt_is_in(picref->format, yuvj_formats);
s->pixel_black_th_i = full ? s->pixel_black_th * max :
// luminance_minimum_value + pixel_black_th * luminance_range_size
16 * factor + s->pixel_black_th * (235 - 16) * factor;
ff_filter_execute(ctx, black_counter, picref, NULL,
FFMIN(inlink->h, s->nb_threads));
for (int i = 0; i < s->nb_threads; i++)
s->nb_black_pixels += s->counter[i];
picture_black_ratio = (double)s->nb_black_pixels / (inlink->w * inlink->h);
av_log(ctx, AV_LOG_DEBUG,
"frame:%"PRId64" picture_black_ratio:%f pts:%s t:%s type:%c\n",
inlink->frame_count_out, picture_black_ratio,
av_ts2str(picref->pts), av_ts2timestr(picref->pts, &s->time_base),
av_get_picture_type_char(picref->pict_type));
if (picture_black_ratio >= s->picture_black_ratio_th) {
if (!s->black_started) {
/* black starts here */
s->black_started = 1;
s->black_start = picref->pts;
av_dict_set(&picref->metadata, "lavfi.black_start",
av_ts2timestr(s->black_start, &s->time_base), 0);
}
} else if (s->black_started) {
/* black ends here */
s->black_started = 0;
s->black_end = picref->pts;
check_black_end(ctx);
av_dict_set(&picref->metadata, "lavfi.black_end",
av_ts2timestr(s->black_end, &s->time_base), 0);
}
s->last_picref_pts = picref->pts;
s->nb_black_pixels = 0;
return ff_filter_frame(inlink->dst->outputs[0], picref);
}
static av_cold void uninit(AVFilterContext *ctx)
{
BlackDetectContext *s = ctx->priv;
av_freep(&s->counter);
if (s->black_started) {
// FIXME: black_end should be set to last_picref_pts + last_picref_duration
s->black_end = s->last_picref_pts;
check_black_end(ctx);
}
}
static const AVFilterPad blackdetect_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input,
.filter_frame = filter_frame,
},
};
const AVFilter ff_vf_blackdetect = {
.name = "blackdetect",
.description = NULL_IF_CONFIG_SMALL("Detect video intervals that are (almost) black."),
.priv_size = sizeof(BlackDetectContext),
FILTER_INPUTS(blackdetect_inputs),
FILTER_OUTPUTS(ff_video_default_filterpad),
FILTER_PIXFMTS_ARRAY(pix_fmts),
.uninit = uninit,
.priv_class = &blackdetect_class,
.flags = AVFILTER_FLAG_SLICE_THREADS | AVFILTER_FLAG_METADATA_ONLY,
};