2019-10-08 15:28:36 +00:00
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/*
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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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/**
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* @file
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* video scene change detection filter
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*/
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#include "libavutil/avassert.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "libavutil/timestamp.h"
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#include "avfilter.h"
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#include "filters.h"
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#include "scene_sad.h"
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typedef struct SCDetContext {
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const AVClass *class;
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ptrdiff_t width[4];
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ptrdiff_t height[4];
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int nb_planes;
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int bitdepth;
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ff_scene_sad_fn sad;
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double prev_mafd;
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double scene_score;
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AVFrame *prev_picref;
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double threshold;
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int sc_pass;
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} SCDetContext;
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#define OFFSET(x) offsetof(SCDetContext, x)
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#define V AV_OPT_FLAG_VIDEO_PARAM
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#define F AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption scdet_options[] = {
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{ "threshold", "set scene change detect threshold", OFFSET(threshold), AV_OPT_TYPE_DOUBLE, {.dbl = 10.}, 0, 100., V|F },
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{ "t", "set scene change detect threshold", OFFSET(threshold), AV_OPT_TYPE_DOUBLE, {.dbl = 10.}, 0, 100., V|F },
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{ "sc_pass", "Set the flag to pass scene change frames", OFFSET(sc_pass), AV_OPT_TYPE_BOOL, {.dbl = 0 }, 0, 1, V|F },
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{ "s", "Set the flag to pass scene change frames", OFFSET(sc_pass), AV_OPT_TYPE_BOOL, {.dbl = 0 }, 0, 1, V|F },
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{NULL}
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};
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AVFILTER_DEFINE_CLASS(scdet);
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static int query_formats(AVFilterContext *ctx)
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{
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static const enum AVPixelFormat pix_fmts[] = {
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AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24, AV_PIX_FMT_RGBA,
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AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA, AV_PIX_FMT_GRAY8,
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AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVJ420P,
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AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVJ422P,
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AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUVJ440P,
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AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVJ444P,
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AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV420P12,
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AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV422P12,
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AV_PIX_FMT_YUV444P9, AV_PIX_FMT_YUV444P10, AV_PIX_FMT_YUV444P12,
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AV_PIX_FMT_NONE
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};
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AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
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if (!fmts_list)
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return AVERROR(ENOMEM);
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return ff_set_common_formats(ctx, fmts_list);
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}
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static int config_input(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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SCDetContext *s = ctx->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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int is_yuv = !(desc->flags & AV_PIX_FMT_FLAG_RGB) &&
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(desc->flags & AV_PIX_FMT_FLAG_PLANAR) &&
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desc->nb_components >= 3;
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s->bitdepth = desc->comp[0].depth;
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s->nb_planes = is_yuv ? 1 : av_pix_fmt_count_planes(inlink->format);
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for (int plane = 0; plane < 4; plane++) {
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ptrdiff_t line_size = av_image_get_linesize(inlink->format, inlink->w, plane);
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s->width[plane] = line_size >> (s->bitdepth > 8);
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s->height[plane] = inlink->h >> ((plane == 1 || plane == 2) ? desc->log2_chroma_h : 0);
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}
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s->sad = ff_scene_sad_get_fn(s->bitdepth == 8 ? 8 : 16);
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if (!s->sad)
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return AVERROR(EINVAL);
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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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SCDetContext *s = ctx->priv;
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av_frame_free(&s->prev_picref);
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}
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static double get_scene_score(AVFilterContext *ctx, AVFrame *frame)
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{
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double ret = 0;
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SCDetContext *s = ctx->priv;
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AVFrame *prev_picref = s->prev_picref;
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if (prev_picref && frame->height == prev_picref->height
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&& frame->width == prev_picref->width) {
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uint64_t sad = 0;
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double mafd, diff;
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uint64_t count = 0;
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for (int plane = 0; plane < s->nb_planes; plane++) {
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uint64_t plane_sad;
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s->sad(prev_picref->data[plane], prev_picref->linesize[plane],
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frame->data[plane], frame->linesize[plane],
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s->width[plane], s->height[plane], &plane_sad);
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sad += plane_sad;
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count += s->width[plane] * s->height[plane];
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}
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emms_c();
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mafd = (double)sad * 100. / count / (1ULL << s->bitdepth);
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diff = fabs(mafd - s->prev_mafd);
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ret = av_clipf(FFMIN(mafd, diff), 0, 100.);
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s->prev_mafd = mafd;
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av_frame_free(&prev_picref);
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}
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s->prev_picref = av_frame_clone(frame);
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return ret;
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}
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static int set_meta(SCDetContext *s, AVFrame *frame, const char *key, const char *value)
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{
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return av_dict_set(&frame->metadata, key, value, 0);
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}
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static int activate(AVFilterContext *ctx)
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{
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int ret;
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AVFilterLink *inlink = ctx->inputs[0];
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AVFilterLink *outlink = ctx->outputs[0];
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SCDetContext *s = ctx->priv;
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AVFrame *frame;
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FF_FILTER_FORWARD_STATUS_BACK(outlink, inlink);
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ret = ff_inlink_consume_frame(inlink, &frame);
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if (ret < 0)
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return ret;
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if (frame) {
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char buf[64];
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s->scene_score = get_scene_score(ctx, frame);
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snprintf(buf, sizeof(buf), "%0.3f", s->prev_mafd);
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set_meta(s, frame, "lavfi.scd.mafd", buf);
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snprintf(buf, sizeof(buf), "%0.3f", s->scene_score);
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set_meta(s, frame, "lavfi.scd.score", buf);
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if (s->scene_score > s->threshold) {
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av_log(s, AV_LOG_INFO, "lavfi.scd.score: %.3f, lavfi.scd.time: %s\n",
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s->scene_score, av_ts2timestr(frame->pts, &inlink->time_base));
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set_meta(s, frame, "lavfi.scd.time",
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av_ts2timestr(frame->pts, &inlink->time_base));
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}
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if (s->sc_pass) {
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if (s->scene_score > s->threshold)
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return ff_filter_frame(outlink, frame);
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else {
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av_frame_free(&frame);
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}
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} else
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return ff_filter_frame(outlink, frame);
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}
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FF_FILTER_FORWARD_STATUS(inlink, outlink);
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FF_FILTER_FORWARD_WANTED(outlink, inlink);
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return FFERROR_NOT_READY;
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}
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static const AVFilterPad scdet_inputs[] = {
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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_input,
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},
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{ NULL }
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};
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static const AVFilterPad scdet_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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{ NULL }
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};
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2021-04-19 16:33:56 +00:00
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const AVFilter ff_vf_scdet = {
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2019-10-08 15:28:36 +00:00
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.name = "scdet",
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.description = NULL_IF_CONFIG_SMALL("Detect video scene change"),
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.priv_size = sizeof(SCDetContext),
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.priv_class = &scdet_class,
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.uninit = uninit,
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.query_formats = query_formats,
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.inputs = scdet_inputs,
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.outputs = scdet_outputs,
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.activate = activate,
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};
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