256 lines
8.8 KiB
C
256 lines
8.8 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/opt.h"
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#include "libavutil/imgutils.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "internal.h"
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#include "video.h"
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typedef struct BackgroundkeyContext {
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const AVClass *class;
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float threshold;
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float similarity;
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float blend;
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int max;
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int nb_threads;
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int hsub_log2;
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int vsub_log2;
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int64_t max_sum;
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int64_t *sums;
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AVFrame *background;
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int (*do_slice)(AVFilterContext *avctx, void *arg,
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int jobnr, int nb_jobs);
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} BackgroundkeyContext;
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static int do_backgroundkey_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
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{
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BackgroundkeyContext *s = avctx->priv;
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AVFrame *frame = arg;
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const int slice_start = (frame->height * jobnr) / nb_jobs;
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const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs;
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const int min_diff = (255 + 255 + 255) * s->similarity;
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const float blend = s->blend;
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const int hsub = s->hsub_log2;
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const int vsub = s->vsub_log2;
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int64_t sum = 0;
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for (int y = slice_start; y < slice_end; y++) {
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const uint8_t *srcy = frame->data[0] + frame->linesize[0] * y;
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const uint8_t *srcu = frame->data[1] + frame->linesize[1] * (y >> vsub);
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const uint8_t *srcv = frame->data[2] + frame->linesize[2] * (y >> vsub);
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const uint8_t *bsrcy = s->background->data[0] + s->background->linesize[0] * y;
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const uint8_t *bsrcu = s->background->data[1] + s->background->linesize[1] * (y >> vsub);
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const uint8_t *bsrcv = s->background->data[2] + s->background->linesize[2] * (y >> vsub);
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uint8_t *dst = frame->data[3] + frame->linesize[3] * y;
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for (int x = 0; x < frame->width; x++) {
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const int xx = x >> hsub;
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const int diff = FFABS(srcy[x] - bsrcy[x]) +
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FFABS(srcu[xx] - bsrcu[xx]) +
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FFABS(srcv[xx] - bsrcv[xx]);
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int A;
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sum += diff;
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if (blend > 0.f) {
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A = 255 - av_clipf((min_diff - diff) / blend, 0.f, 255.f);
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} else {
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A = (diff > min_diff) ? 255 : 0;
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}
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dst[x] = A;
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}
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}
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s->sums[jobnr] = sum;
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return 0;
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}
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static int do_backgroundkey16_slice(AVFilterContext *avctx, void *arg, int jobnr, int nb_jobs)
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{
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BackgroundkeyContext *s = avctx->priv;
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AVFrame *frame = arg;
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const int slice_start = (frame->height * jobnr) / nb_jobs;
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const int slice_end = (frame->height * (jobnr + 1)) / nb_jobs;
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const int hsub = s->hsub_log2;
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const int vsub = s->vsub_log2;
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const int max = s->max;
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const int min_diff = s->similarity * (s->max + s->max + s->max);
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const float blend = s->blend;
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int64_t sum = 0;
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for (int y = slice_start; y < slice_end; y++) {
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const uint16_t *srcy = (const uint16_t *)(frame->data[0] + frame->linesize[0] * y);
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const uint16_t *srcu = (const uint16_t *)(frame->data[1] + frame->linesize[1] * (y >> vsub));
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const uint16_t *srcv = (const uint16_t *)(frame->data[2] + frame->linesize[2] * (y >> vsub));
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const uint16_t *bsrcy = (const uint16_t *)(s->background->data[0] + s->background->linesize[0] * y);
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const uint16_t *bsrcu = (const uint16_t *)(s->background->data[1] + s->background->linesize[1] * (y >> vsub));
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const uint16_t *bsrcv = (const uint16_t *)(s->background->data[2] + s->background->linesize[2] * (y >> vsub));
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uint16_t *dst = (uint16_t *)(frame->data[3] + frame->linesize[3] * y);
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for (int x = 0; x < frame->width; x++) {
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const int xx = x >> hsub;
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const int diff = FFABS(srcy[x] - bsrcy[x] ) +
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FFABS(srcu[xx] - bsrcu[xx]) +
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FFABS(srcv[xx] - bsrcv[xx]);
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int A;
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sum += diff;
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if (blend > 0.f) {
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A = max - av_clipf((min_diff - diff) / blend, 0.f, max);
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} else {
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A = (diff > min_diff) ? max : 0;
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}
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dst[x] = A;
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}
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}
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s->sums[jobnr] = sum;
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return 0;
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}
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static int filter_frame(AVFilterLink *link, AVFrame *frame)
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{
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AVFilterContext *avctx = link->dst;
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BackgroundkeyContext *s = avctx->priv;
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int64_t sum = 0;
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int ret = 0;
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if (!s->background) {
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s->background = ff_get_video_buffer(link, frame->width, frame->height);
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if (!s->background) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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ret = av_frame_copy(s->background, frame);
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if (ret < 0)
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goto fail;
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}
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if (ret = ff_filter_execute(avctx, s->do_slice, frame, NULL,
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FFMIN(frame->height, s->nb_threads)))
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goto fail;
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for (int n = 0; n < s->nb_threads; n++)
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sum += s->sums[n];
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if (s->max_sum * s->threshold < sum) {
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ret = av_frame_copy(s->background, frame);
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if (ret < 0)
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goto fail;
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}
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return ff_filter_frame(avctx->outputs[0], frame);
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fail:
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av_frame_free(&frame);
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return ret;
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}
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static av_cold int config_output(AVFilterLink *outlink)
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{
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(outlink->format);
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AVFilterContext *avctx = outlink->src;
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AVFilterLink *inlink = avctx->inputs[0];
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BackgroundkeyContext *s = avctx->priv;
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int depth;
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s->nb_threads = ff_filter_get_nb_threads(avctx);
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depth = desc->comp[0].depth;
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s->do_slice = depth <= 8 ? do_backgroundkey_slice : do_backgroundkey16_slice;
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s->max = (1 << depth) - 1;
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s->hsub_log2 = desc->log2_chroma_w;
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s->vsub_log2 = desc->log2_chroma_h;
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s->max_sum = (int64_t)(inlink->w) * inlink->h * s->max;
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s->max_sum += 2LL * (inlink->w >> s->hsub_log2) * (inlink->h >> s->vsub_log2) * s->max;
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s->sums = av_calloc(s->nb_threads, sizeof(*s->sums));
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if (!s->sums)
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return AVERROR(ENOMEM);
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return 0;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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BackgroundkeyContext *s = ctx->priv;
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av_frame_free(&s->background);
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av_freep(&s->sums);
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}
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static const AVFilterPad backgroundkey_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.flags = AVFILTERPAD_FLAG_NEEDS_WRITABLE,
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.filter_frame = filter_frame,
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},
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};
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static const AVFilterPad backgroundkey_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_output,
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},
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};
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#define OFFSET(x) offsetof(BackgroundkeyContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
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static const AVOption backgroundkey_options[] = {
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{ "threshold", "set the scene change threshold", OFFSET(threshold), AV_OPT_TYPE_FLOAT, { .dbl = 0.08}, 0.0, 1.0, FLAGS },
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{ "similarity", "set the similarity", OFFSET(similarity), AV_OPT_TYPE_FLOAT, { .dbl = 0.1 }, 0.0, 1.0, FLAGS },
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{ "blend", "set the blend value", OFFSET(blend), AV_OPT_TYPE_FLOAT, { .dbl = 0.0 }, 0.0, 1.0, FLAGS },
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{ NULL }
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};
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static const enum AVPixelFormat backgroundkey_fmts[] = {
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AV_PIX_FMT_YUVA420P,
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AV_PIX_FMT_YUVA422P,
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AV_PIX_FMT_YUVA444P,
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AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA444P9,
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AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA444P10,
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AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA444P12,
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AV_PIX_FMT_YUVA420P16, AV_PIX_FMT_YUVA422P16, AV_PIX_FMT_YUVA444P16,
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AV_PIX_FMT_GBRAP,
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AV_PIX_FMT_GBRAP10, AV_PIX_FMT_GBRAP12, AV_PIX_FMT_GBRAP16,
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AV_PIX_FMT_NONE
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};
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AVFILTER_DEFINE_CLASS(backgroundkey);
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const AVFilter ff_vf_backgroundkey = {
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.name = "backgroundkey",
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.description = NULL_IF_CONFIG_SMALL("Turns a static background into transparency."),
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.priv_size = sizeof(BackgroundkeyContext),
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.priv_class = &backgroundkey_class,
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.uninit = uninit,
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FILTER_INPUTS(backgroundkey_inputs),
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FILTER_OUTPUTS(backgroundkey_outputs),
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FILTER_PIXFMTS_ARRAY(backgroundkey_fmts),
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
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.process_command = ff_filter_process_command,
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};
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