211 lines
7.9 KiB
C
211 lines
7.9 KiB
C
/*
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* Copyright (c) 2012 Stefano Sabatini
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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 black detector, loosely based on blackframe with extended
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* syntax and features
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*/
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#include <float.h>
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#include "libavutil/opt.h"
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#include "libavutil/timestamp.h"
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#include "avfilter.h"
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#include "internal.h"
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typedef struct BlackDetectContext {
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const AVClass *class;
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double black_min_duration_time; ///< minimum duration of detected black, in seconds
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int64_t black_min_duration; ///< minimum duration of detected black, expressed in timebase units
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int64_t black_start; ///< pts start time of the first black picture
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int64_t black_end; ///< pts end time of the last black picture
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int64_t last_picref_pts; ///< pts of the last input picture
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int black_started;
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double picture_black_ratio_th;
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double pixel_black_th;
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unsigned int pixel_black_th_i;
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unsigned int nb_black_pixels; ///< number of black pixels counted so far
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} BlackDetectContext;
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#define OFFSET(x) offsetof(BlackDetectContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption blackdetect_options[] = {
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{ "d", "set minimum detected black duration in seconds", OFFSET(black_min_duration_time), AV_OPT_TYPE_DOUBLE, {.dbl=2}, 0, DBL_MAX, FLAGS },
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{ "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 },
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{ "picture_black_ratio_th", "set the picture black ratio threshold", OFFSET(picture_black_ratio_th), AV_OPT_TYPE_DOUBLE, {.dbl=.98}, 0, 1, FLAGS },
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{ "pic_th", "set the picture black ratio threshold", OFFSET(picture_black_ratio_th), AV_OPT_TYPE_DOUBLE, {.dbl=.98}, 0, 1, FLAGS },
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{ "pixel_black_th", "set the pixel black threshold", OFFSET(pixel_black_th), AV_OPT_TYPE_DOUBLE, {.dbl=.10}, 0, 1, FLAGS },
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{ "pix_th", "set the pixel black threshold", OFFSET(pixel_black_th), AV_OPT_TYPE_DOUBLE, {.dbl=.10}, 0, 1, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(blackdetect);
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#define YUVJ_FORMATS \
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AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P
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static const enum AVPixelFormat yuvj_formats[] = {
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YUVJ_FORMATS, AV_PIX_FMT_NONE
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};
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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_GRAY8,
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AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,
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AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
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AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
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AV_PIX_FMT_NV12, AV_PIX_FMT_NV21,
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YUVJ_FORMATS,
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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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BlackDetectContext *blackdetect = ctx->priv;
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blackdetect->black_min_duration =
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blackdetect->black_min_duration_time / av_q2d(inlink->time_base);
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blackdetect->pixel_black_th_i = ff_fmt_is_in(inlink->format, yuvj_formats) ?
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// luminance_minimum_value + pixel_black_th * luminance_range_size
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blackdetect->pixel_black_th * 255 :
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16 + blackdetect->pixel_black_th * (235 - 16);
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av_log(blackdetect, AV_LOG_VERBOSE,
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"black_min_duration:%s pixel_black_th:%f pixel_black_th_i:%d picture_black_ratio_th:%f\n",
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av_ts2timestr(blackdetect->black_min_duration, &inlink->time_base),
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blackdetect->pixel_black_th, blackdetect->pixel_black_th_i,
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blackdetect->picture_black_ratio_th);
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return 0;
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}
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static void check_black_end(AVFilterContext *ctx)
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{
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BlackDetectContext *blackdetect = ctx->priv;
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AVFilterLink *inlink = ctx->inputs[0];
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if ((blackdetect->black_end - blackdetect->black_start) >= blackdetect->black_min_duration) {
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av_log(blackdetect, AV_LOG_INFO,
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"black_start:%s black_end:%s black_duration:%s\n",
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av_ts2timestr(blackdetect->black_start, &inlink->time_base),
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av_ts2timestr(blackdetect->black_end, &inlink->time_base),
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av_ts2timestr(blackdetect->black_end - blackdetect->black_start, &inlink->time_base));
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}
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}
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static int request_frame(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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BlackDetectContext *blackdetect = ctx->priv;
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AVFilterLink *inlink = ctx->inputs[0];
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int ret = ff_request_frame(inlink);
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if (ret == AVERROR_EOF && blackdetect->black_started) {
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// FIXME: black_end should be set to last_picref_pts + last_picref_duration
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blackdetect->black_end = blackdetect->last_picref_pts;
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check_black_end(ctx);
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}
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return ret;
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *picref)
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{
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AVFilterContext *ctx = inlink->dst;
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BlackDetectContext *blackdetect = ctx->priv;
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double picture_black_ratio = 0;
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const uint8_t *p = picref->data[0];
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int x, i;
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for (i = 0; i < inlink->h; i++) {
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for (x = 0; x < inlink->w; x++)
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blackdetect->nb_black_pixels += p[x] <= blackdetect->pixel_black_th_i;
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p += picref->linesize[0];
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}
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picture_black_ratio = (double)blackdetect->nb_black_pixels / (inlink->w * inlink->h);
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av_log(ctx, AV_LOG_DEBUG,
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"frame:%"PRId64" picture_black_ratio:%f pts:%s t:%s type:%c\n",
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inlink->frame_count_out, picture_black_ratio,
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av_ts2str(picref->pts), av_ts2timestr(picref->pts, &inlink->time_base),
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av_get_picture_type_char(picref->pict_type));
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if (picture_black_ratio >= blackdetect->picture_black_ratio_th) {
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if (!blackdetect->black_started) {
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/* black starts here */
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blackdetect->black_started = 1;
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blackdetect->black_start = picref->pts;
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av_dict_set(&picref->metadata, "lavfi.black_start",
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av_ts2timestr(blackdetect->black_start, &inlink->time_base), 0);
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}
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} else if (blackdetect->black_started) {
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/* black ends here */
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blackdetect->black_started = 0;
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blackdetect->black_end = picref->pts;
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check_black_end(ctx);
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av_dict_set(&picref->metadata, "lavfi.black_end",
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av_ts2timestr(blackdetect->black_end, &inlink->time_base), 0);
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}
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blackdetect->last_picref_pts = picref->pts;
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blackdetect->nb_black_pixels = 0;
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return ff_filter_frame(inlink->dst->outputs[0], picref);
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}
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static const AVFilterPad blackdetect_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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.filter_frame = filter_frame,
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},
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{ NULL }
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};
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static const AVFilterPad blackdetect_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.request_frame = request_frame,
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},
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{ NULL }
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};
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AVFilter ff_vf_blackdetect = {
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.name = "blackdetect",
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.description = NULL_IF_CONFIG_SMALL("Detect video intervals that are (almost) black."),
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.priv_size = sizeof(BlackDetectContext),
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.query_formats = query_formats,
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.inputs = blackdetect_inputs,
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.outputs = blackdetect_outputs,
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.priv_class = &blackdetect_class,
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};
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