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