mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-28 20:53:54 +02:00
256 lines
8.8 KiB
C
256 lines
8.8 KiB
C
/*
|
|
* 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
|
|
*/
|
|
|
|
#include "libavutil/opt.h"
|
|
#include "libavutil/imgutils.h"
|
|
#include "avfilter.h"
|
|
#include "formats.h"
|
|
#include "internal.h"
|
|
#include "video.h"
|
|
|
|
typedef struct BackgroundkeyContext {
|
|
const AVClass *class;
|
|
|
|
float threshold;
|
|
float similarity;
|
|
float blend;
|
|
int max;
|
|
|
|
int nb_threads;
|
|
int hsub_log2;
|
|
int vsub_log2;
|
|
|
|
int64_t max_sum;
|
|
int64_t *sums;
|
|
|
|
AVFrame *background;
|
|
|
|
int (*do_slice)(AVFilterContext *avctx, void *arg,
|
|
int jobnr, int nb_jobs);
|
|
} BackgroundkeyContext;
|
|
|
|
static int do_backgroundkey_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
|
|
{
|
|
BackgroundkeyContext *s = avctx->priv;
|
|
AVFrame *frame = arg;
|
|
const int slice_start = (frame->height * jobnr) / nb_jobs;
|
|
const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs;
|
|
const int min_diff = (255 + 255 + 255) * s->similarity;
|
|
const float blend = s->blend;
|
|
const int hsub = s->hsub_log2;
|
|
const int vsub = s->vsub_log2;
|
|
int64_t sum = 0;
|
|
|
|
for (int y = slice_start; y < slice_end; y++) {
|
|
const uint8_t *srcy = frame->data[0] + frame->linesize[0] * y;
|
|
const uint8_t *srcu = frame->data[1] + frame->linesize[1] * (y >> vsub);
|
|
const uint8_t *srcv = frame->data[2] + frame->linesize[2] * (y >> vsub);
|
|
const uint8_t *bsrcy = s->background->data[0] + s->background->linesize[0] * y;
|
|
const uint8_t *bsrcu = s->background->data[1] + s->background->linesize[1] * (y >> vsub);
|
|
const uint8_t *bsrcv = s->background->data[2] + s->background->linesize[2] * (y >> vsub);
|
|
uint8_t *dst = frame->data[3] + frame->linesize[3] * y;
|
|
for (int x = 0; x < frame->width; x++) {
|
|
const int xx = x >> hsub;
|
|
const int diff = FFABS(srcy[x] - bsrcy[x]) +
|
|
FFABS(srcu[xx] - bsrcu[xx]) +
|
|
FFABS(srcv[xx] - bsrcv[xx]);
|
|
int A;
|
|
|
|
sum += diff;
|
|
if (blend > 0.f) {
|
|
A = 255 - av_clipf((min_diff - diff) / blend, 0.f, 255.f);
|
|
} else {
|
|
A = (diff > min_diff) ? 255 : 0;
|
|
}
|
|
|
|
dst[x] = A;
|
|
}
|
|
}
|
|
|
|
s->sums[jobnr] = sum;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int do_backgroundkey16_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
|
|
{
|
|
BackgroundkeyContext *s = avctx->priv;
|
|
AVFrame *frame = arg;
|
|
const int slice_start = (frame->height * jobnr) / nb_jobs;
|
|
const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs;
|
|
const int hsub = s->hsub_log2;
|
|
const int vsub = s->vsub_log2;
|
|
const int max = s->max;
|
|
const int min_diff = s->similarity * (s->max + s->max + s->max);
|
|
const float blend = s->blend;
|
|
int64_t sum = 0;
|
|
|
|
for (int y = slice_start; y < slice_end; y++) {
|
|
const uint16_t *srcy = (const uint16_t *)(frame->data[0] + frame->linesize[0] * y);
|
|
const uint16_t *srcu = (const uint16_t *)(frame->data[1] + frame->linesize[1] * (y >> vsub));
|
|
const uint16_t *srcv = (const uint16_t *)(frame->data[2] + frame->linesize[2] * (y >> vsub));
|
|
const uint16_t *bsrcy = (const uint16_t *)(s->background->data[0] + s->background->linesize[0] * y);
|
|
const uint16_t *bsrcu = (const uint16_t *)(s->background->data[1] + s->background->linesize[1] * (y >> vsub));
|
|
const uint16_t *bsrcv = (const uint16_t *)(s->background->data[2] + s->background->linesize[2] * (y >> vsub));
|
|
uint16_t *dst = (uint16_t *)(frame->data[3] + frame->linesize[3] * y);
|
|
for (int x = 0; x < frame->width; x++) {
|
|
const int xx = x >> hsub;
|
|
const int diff = FFABS(srcy[x] - bsrcy[x] ) +
|
|
FFABS(srcu[xx] - bsrcu[xx]) +
|
|
FFABS(srcv[xx] - bsrcv[xx]);
|
|
int A;
|
|
|
|
sum += diff;
|
|
if (blend > 0.f) {
|
|
A = max - av_clipf((min_diff - diff) / blend, 0.f, max);
|
|
} else {
|
|
A = (diff > min_diff) ? max : 0;
|
|
}
|
|
|
|
dst[x] = A;
|
|
}
|
|
}
|
|
|
|
s->sums[jobnr] = sum;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int filter_frame(AVFilterLink *link, AVFrame *frame)
|
|
{
|
|
AVFilterContext *avctx = link->dst;
|
|
BackgroundkeyContext *s = avctx->priv;
|
|
int64_t sum = 0;
|
|
int ret = 0;
|
|
|
|
if (!s->background) {
|
|
s->background = ff_get_video_buffer(link, frame->width, frame->height);
|
|
if (!s->background) {
|
|
ret = AVERROR(ENOMEM);
|
|
goto fail;
|
|
}
|
|
ret = av_frame_copy(s->background, frame);
|
|
if (ret < 0)
|
|
goto fail;
|
|
}
|
|
|
|
if (ret = ff_filter_execute(avctx, s->do_slice, frame, NULL,
|
|
FFMIN(frame->height, s->nb_threads)))
|
|
goto fail;
|
|
|
|
for (int n = 0; n < s->nb_threads; n++)
|
|
sum += s->sums[n];
|
|
if (s->max_sum * s->threshold < sum) {
|
|
ret = av_frame_copy(s->background, frame);
|
|
if (ret < 0)
|
|
goto fail;
|
|
}
|
|
|
|
return ff_filter_frame(avctx->outputs[0], frame);
|
|
fail:
|
|
av_frame_free(&frame);
|
|
return ret;
|
|
}
|
|
|
|
static av_cold int config_output(AVFilterLink *outlink)
|
|
{
|
|
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(outlink->format);
|
|
AVFilterContext *avctx = outlink->src;
|
|
AVFilterLink *inlink = avctx->inputs[0];
|
|
BackgroundkeyContext *s = avctx->priv;
|
|
int depth;
|
|
|
|
s->nb_threads = ff_filter_get_nb_threads(avctx);
|
|
depth = desc->comp[0].depth;
|
|
s->do_slice = depth <= 8 ? do_backgroundkey_slice : do_backgroundkey16_slice;
|
|
s->max = (1 << depth) - 1;
|
|
s->hsub_log2 = desc->log2_chroma_w;
|
|
s->vsub_log2 = desc->log2_chroma_h;
|
|
s->max_sum = (int64_t)(inlink->w) * inlink->h * s->max;
|
|
s->max_sum += 2LL * (inlink->w >> s->hsub_log2) * (inlink->h >> s->vsub_log2) * s->max;
|
|
|
|
s->sums = av_calloc(s->nb_threads, sizeof(*s->sums));
|
|
if (!s->sums)
|
|
return AVERROR(ENOMEM);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold void uninit(AVFilterContext *ctx)
|
|
{
|
|
BackgroundkeyContext *s = ctx->priv;
|
|
|
|
av_frame_free(&s->background);
|
|
av_freep(&s->sums);
|
|
}
|
|
|
|
static const AVFilterPad backgroundkey_inputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE,
|
|
.filter_frame = filter_frame,
|
|
},
|
|
};
|
|
|
|
static const AVFilterPad backgroundkey_outputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.config_props = config_output,
|
|
},
|
|
};
|
|
|
|
#define OFFSET(x) offsetof(BackgroundkeyContext, x)
|
|
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
|
|
|
|
static const AVOption backgroundkey_options[] = {
|
|
{ "threshold", "set the scene change threshold", OFFSET(threshold), AV_OPT_TYPE_FLOAT, { .dbl = 0.08}, 0.0, 1.0, FLAGS },
|
|
{ "similarity", "set the similarity", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.1 }, 0.0, 1.0, FLAGS },
|
|
{ "blend", "set the blend value", OFFSET(blend), AV_OPT_TYPE_FLOAT, { .dbl = 0.0 }, 0.0, 1.0, FLAGS },
|
|
{ NULL }
|
|
};
|
|
|
|
static const enum AVPixelFormat backgroundkey_fmts[] = {
|
|
AV_PIX_FMT_YUVA420P,
|
|
AV_PIX_FMT_YUVA422P,
|
|
AV_PIX_FMT_YUVA444P,
|
|
AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
|
|
AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
|
|
AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,
|
|
AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
|
|
AV_PIX_FMT_GBRAP,
|
|
AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,
|
|
AV_PIX_FMT_NONE
|
|
};
|
|
|
|
AVFILTER_DEFINE_CLASS(backgroundkey);
|
|
|
|
const AVFilter ff_vf_backgroundkey = {
|
|
.name = "backgroundkey",
|
|
.description = NULL_IF_CONFIG_SMALL("Turns a static background into transparency."),
|
|
.priv_size = sizeof(BackgroundkeyContext),
|
|
.priv_class = &backgroundkey_class,
|
|
.uninit = uninit,
|
|
FILTER_INPUTS(backgroundkey_inputs),
|
|
FILTER_OUTPUTS(backgroundkey_outputs),
|
|
FILTER_PIXFMTS_ARRAY(backgroundkey_fmts),
|
|
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
|
|
.process_command = ff_filter_process_command,
|
|
};
|