FFmpeg coverage

Directory:	../../../ffmpeg/
File:	src/libavfilter/vf_blackdetect.c
Date:	2025-07-05 02:49:51

	Total	Coverage
Lines:	97	0.0%
Functions:	6	0.0%
Branches:	36	0.0%

  
      Line
      Branch
      Exec
      Source
    
      /*
    
       * Copyright (c) 2012 Stefano Sabatini
    
       *
    
       * 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 black detector, loosely based on blackframe with extended
    
       * syntax and features
    
       */
    
      #include <float.h>
    
      #include "libavutil/mem.h"
    
      #include "libavutil/opt.h"
    
      #include "libavutil/pixdesc.h"
    
      #include "libavutil/timestamp.h"
    
      #include "avfilter.h"
    
      #include "filters.h"
    
      #include "formats.h"
    
      #include "video.h"
    
      typedef struct BlackDetectContext {
    
          const AVClass *class;
    
          double  black_min_duration_time; ///< minimum duration of detected black, in seconds
    
          int64_t black_min_duration;      ///< minimum duration of detected black, expressed in timebase units
    
          int64_t black_start;             ///< pts start time of the first black picture
    
          int64_t black_end;               ///< pts end time of the last black picture
    
          int64_t last_picref_pts;         ///< pts of the last input picture
    
          int black_started;
    
          double       picture_black_ratio_th;
    
          double       pixel_black_th;
    
          unsigned int pixel_black_th_i;
    
          int          alpha;
    
          unsigned int nb_black_pixels;   ///< number of black pixels counted so far
    
          AVRational   time_base;
    
          int          depth;
    
          int          nb_threads;
    
          unsigned int *counter;
    
      } BlackDetectContext;
    
      #define OFFSET(x) offsetof(BlackDetectContext, x)
    
      #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
    
      static const AVOption blackdetect_options[] = {
    
          { "d",                  "set minimum detected black duration in seconds", OFFSET(black_min_duration_time), AV_OPT_TYPE_DOUBLE, {.dbl=2}, 0, DBL_MAX, FLAGS },
    
          { "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 },
    
          { "picture_black_ratio_th", "set the picture black ratio threshold", OFFSET(picture_black_ratio_th), AV_OPT_TYPE_DOUBLE, {.dbl=.98}, 0, 1, FLAGS },
    
          { "pic_th",                 "set the picture black ratio threshold", OFFSET(picture_black_ratio_th), AV_OPT_TYPE_DOUBLE, {.dbl=.98}, 0, 1, FLAGS },
    
          { "pixel_black_th", "set the pixel black threshold", OFFSET(pixel_black_th), AV_OPT_TYPE_DOUBLE, {.dbl=.10}, 0, 1, FLAGS },
    
          { "pix_th",         "set the pixel black threshold", OFFSET(pixel_black_th), AV_OPT_TYPE_DOUBLE, {.dbl=.10}, 0, 1, FLAGS },
    
          { "alpha",          "check alpha instead of luma", OFFSET(alpha), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
    
          { NULL }
    
      };
    
      AVFILTER_DEFINE_CLASS(blackdetect);
    
      #define YUVJ_FORMATS \
    
          AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P
    
      #define YUVA_FORMATS \
    
          AV_PIX_FMT_YUVA420P,  AV_PIX_FMT_YUVA422P,   AV_PIX_FMT_YUVA444P, \
    
          AV_PIX_FMT_YUVA444P9, AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA444P12, AV_PIX_FMT_YUVA444P16, \
    
          AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA422P16, \
    
          AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA420P16
    
      static const enum AVPixelFormat yuvj_formats[] = {
    
          YUVJ_FORMATS, AV_PIX_FMT_NONE
    
      };
    
      static const enum AVPixelFormat yuva_formats[] = {
    
          YUVA_FORMATS, AV_PIX_FMT_NONE
    
      };
    
      static const enum AVPixelFormat yuv_formats[] = {
    
          AV_PIX_FMT_GRAY8,
    
          AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,
    
          AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
    
          AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
    
          AV_PIX_FMT_NV12, AV_PIX_FMT_NV21,
    
          YUVJ_FORMATS,
    
          AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14,
    
          AV_PIX_FMT_GRAY16,
    
          AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
    
          AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
    
          AV_PIX_FMT_YUV440P10,
    
          AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV420P12,
    
          AV_PIX_FMT_YUV440P12,
    
          AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV420P14,
    
          AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
    
          YUVA_FORMATS, AV_PIX_FMT_NONE
    
      };
    
      ✗
      static int query_format(const AVFilterContext *ctx,
    
                              AVFilterFormatsConfig **cfg_in,
    
                              AVFilterFormatsConfig **cfg_out)
    
      {
    
      ✗
          const BlackDetectContext *s = ctx->priv;
    
          AVFilterFormats *formats;
    
      ✗
          if (s->alpha)
    
      ✗
              formats = ff_make_format_list(yuva_formats);
    
          else
    
      ✗
              formats = ff_make_format_list(yuv_formats);
    
      ✗
          return ff_set_common_formats2(ctx, cfg_in, cfg_out, formats);
    
      }
    
      ✗
      static int config_input(AVFilterLink *inlink)
    
      {
    
      ✗
          AVFilterContext *ctx = inlink->dst;
    
      ✗
          BlackDetectContext *s = ctx->priv;
    
      ✗
          const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
    
      ✗
          const int depth = desc->comp[0].depth;
    
      ✗
          s->depth = depth;
    
      ✗
          s->nb_threads = ff_filter_get_nb_threads(ctx);
    
      ✗
          s->time_base = inlink->time_base;
    
      ✗
          s->black_min_duration = s->black_min_duration_time / av_q2d(s->time_base);
    
      ✗
          s->counter = av_calloc(s->nb_threads, sizeof(*s->counter));
    
      ✗
          if (!s->counter)
    
      ✗
              return AVERROR(ENOMEM);
    
      ✗
          av_log(s, AV_LOG_VERBOSE,
    
                 "black_min_duration:%s pixel_black_th:%f picture_black_ratio_th:%f alpha:%d\n",
    
      ✗
                 av_ts2timestr(s->black_min_duration, &s->time_base),
    
                 s->pixel_black_th, s->picture_black_ratio_th, s->alpha);
    
      ✗
          return 0;
    
      }
    
      ✗
      static void check_black_end(AVFilterContext *ctx)
    
      {
    
      ✗
          BlackDetectContext *s = ctx->priv;
    
      ✗
          if ((s->black_end - s->black_start) >= s->black_min_duration) {
    
      ✗
              av_log(s, AV_LOG_INFO,
    
                     "black_start:%s black_end:%s black_duration:%s\n",
    
      ✗
                     av_ts2timestr(s->black_start, &s->time_base),
    
      ✗
                     av_ts2timestr(s->black_end,   &s->time_base),
    
      ✗
                     av_ts2timestr(s->black_end - s->black_start, &s->time_base));
    
          }
    
      ✗
      }
    
      ✗
      static int black_counter(AVFilterContext *ctx, void *arg,
    
                               int jobnr, int nb_jobs)
    
      {
    
      ✗
          BlackDetectContext *s = ctx->priv;
    
      ✗
          const unsigned int threshold = s->pixel_black_th_i;
    
      ✗
          unsigned int *counterp = &s->counter[jobnr];
    
      ✗
          AVFrame *in = arg;
    
      ✗
          const int plane = s->alpha ? 3 : 0;
    
      ✗
          const int linesize = in->linesize[plane];
    
      ✗
          const int w = in->width;
    
      ✗
          const int h = in->height;
    
      ✗
          const int start = (h * jobnr) / nb_jobs;
    
      ✗
          const int end = (h * (jobnr+1)) / nb_jobs;
    
      ✗
          const int size = end - start;
    
      ✗
          unsigned int counter = 0;
    
      ✗
          if (s->depth == 8) {
    
      ✗
              const uint8_t *p = in->data[plane] + start * linesize;
    
      ✗
              for (int i = 0; i < size; i++) {
    
      ✗
                  for (int x = 0; x < w; x++)
    
      ✗
                      counter += p[x] <= threshold;
    
      ✗
                  p += linesize;
    
              }
    
          } else {
    
      ✗
              const uint16_t *p = (const uint16_t *)(in->data[plane] + start * linesize);
    
      ✗
              for (int i = 0; i < size; i++) {
    
      ✗
                  for (int x = 0; x < w; x++)
    
      ✗
                      counter += p[x] <= threshold;
    
      ✗
                  p += linesize / 2;
    
              }
    
          }
    
      ✗
          *counterp = counter;
    
      ✗
          return 0;
    
      }
    
      ✗
      static int filter_frame(AVFilterLink *inlink, AVFrame *picref)
    
      {
    
      ✗
          FilterLink *inl = ff_filter_link(inlink);
    
      ✗
          AVFilterContext *ctx = inlink->dst;
    
      ✗
          BlackDetectContext *s = ctx->priv;
    
      ✗
          double picture_black_ratio = 0;
    
      ✗
          const int max = (1 << s->depth) - 1;
    
      ✗
          const int factor = (1 << (s->depth - 8));
    
      ✗
          const int full = picref->color_range == AVCOL_RANGE_JPEG ||
    
      ✗
                           ff_fmt_is_in(picref->format, yuvj_formats) ||
    
      ✗
                           s->alpha;
    
      ✗
          s->pixel_black_th_i = full ? s->pixel_black_th * max :
    
              // luminance_minimum_value + pixel_black_th * luminance_range_size
    
      ✗
              16 * factor + s->pixel_black_th * (235 - 16) * factor;
    
      ✗
          ff_filter_execute(ctx, black_counter, picref, NULL,
    
      ✗
                            FFMIN(inlink->h, s->nb_threads));
    
      ✗
          for (int i = 0; i < s->nb_threads; i++)
    
      ✗
              s->nb_black_pixels += s->counter[i];
    
      ✗
          picture_black_ratio = (double)s->nb_black_pixels / (inlink->w * inlink->h);
    
      ✗
          av_log(ctx, AV_LOG_DEBUG,
    
                 "frame:%"PRId64" picture_black_ratio:%f pts:%s t:%s type:%c\n",
    
                 inl->frame_count_out, picture_black_ratio,
    
      ✗
                 av_ts2str(picref->pts), av_ts2timestr(picref->pts, &s->time_base),
    
      ✗
                 av_get_picture_type_char(picref->pict_type));
    
      ✗
          if (picture_black_ratio >= s->picture_black_ratio_th) {
    
      ✗
              if (!s->black_started) {
    
                  /* black starts here */
    
      ✗
                  s->black_started = 1;
    
      ✗
                  s->black_start = picref->pts;
    
      ✗
                  av_dict_set(&picref->metadata, "lavfi.black_start",
    
      ✗
                      av_ts2timestr(s->black_start, &s->time_base), 0);
    
              }
    
      ✗
          } else if (s->black_started) {
    
              /* black ends here */
    
      ✗
              s->black_started = 0;
    
      ✗
              s->black_end = picref->pts;
    
      ✗
              check_black_end(ctx);
    
      ✗
              av_dict_set(&picref->metadata, "lavfi.black_end",
    
      ✗
                  av_ts2timestr(s->black_end, &s->time_base), 0);
    
          }
    
      ✗
          s->last_picref_pts = picref->pts;
    
      ✗
          s->nb_black_pixels = 0;
    
      ✗
          return ff_filter_frame(inlink->dst->outputs[0], picref);
    
      }
    
      ✗
      static av_cold void uninit(AVFilterContext *ctx)
    
      {
    
      ✗
          BlackDetectContext *s = ctx->priv;
    
      ✗
          av_freep(&s->counter);
    
      ✗
          if (s->black_started) {
    
              // FIXME: black_end should be set to last_picref_pts + last_picref_duration
    
      ✗
              s->black_end = s->last_picref_pts;
    
      ✗
              check_black_end(ctx);
    
          }
    
      ✗
      }
    
      static const AVFilterPad blackdetect_inputs[] = {
    
          {
    
              .name          = "default",
    
              .type          = AVMEDIA_TYPE_VIDEO,
    
              .config_props  = config_input,
    
              .filter_frame  = filter_frame,
    
          },
    
      };
    
      const FFFilter ff_vf_blackdetect = {
    
          .p.name        = "blackdetect",
    
          .p.description = NULL_IF_CONFIG_SMALL("Detect video intervals that are (almost) black."),
    
          .p.priv_class  = &blackdetect_class,
    
          .p.flags       = AVFILTER_FLAG_SLICE_THREADS | AVFILTER_FLAG_METADATA_ONLY,
    
          .priv_size     = sizeof(BlackDetectContext),
    
          FILTER_INPUTS(blackdetect_inputs),
    
          FILTER_OUTPUTS(ff_video_default_filterpad),
    
          FILTER_QUERY_FUNC2(query_format),
    
          .uninit        = uninit,
    
      };

Line	Exec	Source
1		/*
2		* Copyright (c) 2012 Stefano Sabatini
3		*
4		* This file is part of FFmpeg.
5		*
6		* FFmpeg is free software; you can redistribute it and/or
7		* modify it under the terms of the GNU Lesser General Public
8		* License as published by the Free Software Foundation; either
9		* version 2.1 of the License, or (at your option) any later version.
10		*
11		* FFmpeg is distributed in the hope that it will be useful,
12		* but WITHOUT ANY WARRANTY; without even the implied warranty of
13		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14		* Lesser General Public License for more details.
15		*
16		* You should have received a copy of the GNU Lesser General Public
17		* License along with FFmpeg; if not, write to the Free Software
18		* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19		*/
20
21		/**
22		* @file
23		* Video black detector, loosely based on blackframe with extended
24		* syntax and features
25		*/
26
27		#include <float.h>
28		#include "libavutil/mem.h"
29		#include "libavutil/opt.h"
30		#include "libavutil/pixdesc.h"
31		#include "libavutil/timestamp.h"
32		#include "avfilter.h"
33		#include "filters.h"
34		#include "formats.h"
35		#include "video.h"
36
37		typedef struct BlackDetectContext {
38		const AVClass *class;
39		double black_min_duration_time; ///< minimum duration of detected black, in seconds
40		int64_t black_min_duration; ///< minimum duration of detected black, expressed in timebase units
41		int64_t black_start; ///< pts start time of the first black picture
42		int64_t black_end; ///< pts end time of the last black picture
43		int64_t last_picref_pts; ///< pts of the last input picture
44		int black_started;
45
46		double picture_black_ratio_th;
47		double pixel_black_th;
48		unsigned int pixel_black_th_i;
49		int alpha;
50
51		unsigned int nb_black_pixels; ///< number of black pixels counted so far
52		AVRational time_base;
53		int depth;
54		int nb_threads;
55		unsigned int *counter;
56		} BlackDetectContext;
57
58		#define OFFSET(x) offsetof(BlackDetectContext, x)
59		#define FLAGS AV_OPT_FLAG_VIDEO_PARAM\|AV_OPT_FLAG_FILTERING_PARAM
60
61		static const AVOption blackdetect_options[] = {
62		{ "d", "set minimum detected black duration in seconds", OFFSET(black_min_duration_time), AV_OPT_TYPE_DOUBLE, {.dbl=2}, 0, DBL_MAX, FLAGS },
63		{ "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 },
64		{ "picture_black_ratio_th", "set the picture black ratio threshold", OFFSET(picture_black_ratio_th), AV_OPT_TYPE_DOUBLE, {.dbl=.98}, 0, 1, FLAGS },
65		{ "pic_th", "set the picture black ratio threshold", OFFSET(picture_black_ratio_th), AV_OPT_TYPE_DOUBLE, {.dbl=.98}, 0, 1, FLAGS },
66		{ "pixel_black_th", "set the pixel black threshold", OFFSET(pixel_black_th), AV_OPT_TYPE_DOUBLE, {.dbl=.10}, 0, 1, FLAGS },
67		{ "pix_th", "set the pixel black threshold", OFFSET(pixel_black_th), AV_OPT_TYPE_DOUBLE, {.dbl=.10}, 0, 1, FLAGS },
68		{ "alpha", "check alpha instead of luma", OFFSET(alpha), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS },
69		{ NULL }
70		};
71
72		AVFILTER_DEFINE_CLASS(blackdetect);
73
74		#define YUVJ_FORMATS \
75		AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P
76
77		#define YUVA_FORMATS \
78		AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P, \
79		AV_PIX_FMT_YUVA444P9, AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA444P12, AV_PIX_FMT_YUVA444P16, \
80		AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA422P16, \
81		AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA420P16
82
83		static const enum AVPixelFormat yuvj_formats[] = {
84		YUVJ_FORMATS, AV_PIX_FMT_NONE
85		};
86
87		static const enum AVPixelFormat yuva_formats[] = {
88		YUVA_FORMATS, AV_PIX_FMT_NONE
89		};
90
91		static const enum AVPixelFormat yuv_formats[] = {
92		AV_PIX_FMT_GRAY8,
93		AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,
94		AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
95		AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
96		AV_PIX_FMT_NV12, AV_PIX_FMT_NV21,
97		YUVJ_FORMATS,
98		AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14,
99		AV_PIX_FMT_GRAY16,
100		AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
101		AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
102		AV_PIX_FMT_YUV440P10,
103		AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV420P12,
104		AV_PIX_FMT_YUV440P12,
105		AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV420P14,
106		AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
107		YUVA_FORMATS, AV_PIX_FMT_NONE
108		};
109
110	✗	static int query_format(const AVFilterContext *ctx,
111		AVFilterFormatsConfig **cfg_in,
112		AVFilterFormatsConfig **cfg_out)
113		{
114	✗	const BlackDetectContext *s = ctx->priv;
115		AVFilterFormats *formats;
116	✗	if (s->alpha)
117	✗	formats = ff_make_format_list(yuva_formats);
118		else
119	✗	formats = ff_make_format_list(yuv_formats);
120
121	✗	return ff_set_common_formats2(ctx, cfg_in, cfg_out, formats);
122		}
123
124	✗	static int config_input(AVFilterLink *inlink)
125		{
126	✗	AVFilterContext *ctx = inlink->dst;
127	✗	BlackDetectContext *s = ctx->priv;
128	✗	const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
129	✗	const int depth = desc->comp[0].depth;
130
131	✗	s->depth = depth;
132	✗	s->nb_threads = ff_filter_get_nb_threads(ctx);
133	✗	s->time_base = inlink->time_base;
134	✗	s->black_min_duration = s->black_min_duration_time / av_q2d(s->time_base);
135	✗	s->counter = av_calloc(s->nb_threads, sizeof(*s->counter));
136	✗	if (!s->counter)
137	✗	return AVERROR(ENOMEM);
138
139	✗	av_log(s, AV_LOG_VERBOSE,
140		"black_min_duration:%s pixel_black_th:%f picture_black_ratio_th:%f alpha:%d\n",
141	✗	av_ts2timestr(s->black_min_duration, &s->time_base),
142		s->pixel_black_th, s->picture_black_ratio_th, s->alpha);
143	✗	return 0;
144		}
145
146	✗	static void check_black_end(AVFilterContext *ctx)
147		{
148	✗	BlackDetectContext *s = ctx->priv;
149
150	✗	if ((s->black_end - s->black_start) >= s->black_min_duration) {
151	✗	av_log(s, AV_LOG_INFO,
152		"black_start:%s black_end:%s black_duration:%s\n",
153	✗	av_ts2timestr(s->black_start, &s->time_base),
154	✗	av_ts2timestr(s->black_end, &s->time_base),
155	✗	av_ts2timestr(s->black_end - s->black_start, &s->time_base));
156		}
157	✗	}
158
159	✗	static int black_counter(AVFilterContext ctx, void arg,
160		int jobnr, int nb_jobs)
161		{
162	✗	BlackDetectContext *s = ctx->priv;
163	✗	const unsigned int threshold = s->pixel_black_th_i;
164	✗	unsigned int *counterp = &s->counter[jobnr];
165	✗	AVFrame *in = arg;
166	✗	const int plane = s->alpha ? 3 : 0;
167	✗	const int linesize = in->linesize[plane];
168	✗	const int w = in->width;
169	✗	const int h = in->height;
170	✗	const int start = (h * jobnr) / nb_jobs;
171	✗	const int end = (h * (jobnr+1)) / nb_jobs;
172	✗	const int size = end - start;
173	✗	unsigned int counter = 0;
174
175	✗	if (s->depth == 8) {
176	✗	const uint8_t p = in->data[plane] + start linesize;
177
178	✗	for (int i = 0; i < size; i++) {
179	✗	for (int x = 0; x < w; x++)
180	✗	counter += p[x] <= threshold;
181	✗	p += linesize;
182		}
183		} else {
184	✗	const uint16_t p = (const uint16_t )(in->data[plane] + start * linesize);
185
186	✗	for (int i = 0; i < size; i++) {
187	✗	for (int x = 0; x < w; x++)
188	✗	counter += p[x] <= threshold;
189	✗	p += linesize / 2;
190		}
191		}
192
193	✗	*counterp = counter;
194
195	✗	return 0;
196		}
197
198	✗	static int filter_frame(AVFilterLink inlink, AVFrame picref)
199		{
200	✗	FilterLink *inl = ff_filter_link(inlink);
201	✗	AVFilterContext *ctx = inlink->dst;
202	✗	BlackDetectContext *s = ctx->priv;
203	✗	double picture_black_ratio = 0;
204	✗	const int max = (1 << s->depth) - 1;
205	✗	const int factor = (1 << (s->depth - 8));
206	✗	const int full = picref->color_range == AVCOL_RANGE_JPEG \|\|
207	✗	ff_fmt_is_in(picref->format, yuvj_formats) \|\|
208	✗	s->alpha;
209
210	✗	s->pixel_black_th_i = full ? s->pixel_black_th * max :
211		// luminance_minimum_value + pixel_black_th * luminance_range_size
212	✗	16 * factor + s->pixel_black_th * (235 - 16) * factor;
213
214	✗	ff_filter_execute(ctx, black_counter, picref, NULL,
215	✗	FFMIN(inlink->h, s->nb_threads));
216
217	✗	for (int i = 0; i < s->nb_threads; i++)
218	✗	s->nb_black_pixels += s->counter[i];
219
220	✗	picture_black_ratio = (double)s->nb_black_pixels / (inlink->w * inlink->h);
221
222	✗	av_log(ctx, AV_LOG_DEBUG,
223		"frame:%"PRId64" picture_black_ratio:%f pts:%s t:%s type:%c\n",
224		inl->frame_count_out, picture_black_ratio,
225	✗	av_ts2str(picref->pts), av_ts2timestr(picref->pts, &s->time_base),
226	✗	av_get_picture_type_char(picref->pict_type));
227
228	✗	if (picture_black_ratio >= s->picture_black_ratio_th) {
229	✗	if (!s->black_started) {
230		/* black starts here */
231	✗	s->black_started = 1;
232	✗	s->black_start = picref->pts;
233	✗	av_dict_set(&picref->metadata, "lavfi.black_start",
234	✗	av_ts2timestr(s->black_start, &s->time_base), 0);
235		}
236	✗	} else if (s->black_started) {
237		/* black ends here */
238	✗	s->black_started = 0;
239	✗	s->black_end = picref->pts;
240	✗	check_black_end(ctx);
241	✗	av_dict_set(&picref->metadata, "lavfi.black_end",
242	✗	av_ts2timestr(s->black_end, &s->time_base), 0);
243		}
244
245	✗	s->last_picref_pts = picref->pts;
246	✗	s->nb_black_pixels = 0;
247	✗	return ff_filter_frame(inlink->dst->outputs[0], picref);
248		}
249
250	✗	static av_cold void uninit(AVFilterContext *ctx)
251		{
252	✗	BlackDetectContext *s = ctx->priv;
253
254	✗	av_freep(&s->counter);
255
256	✗	if (s->black_started) {
257		// FIXME: black_end should be set to last_picref_pts + last_picref_duration
258	✗	s->black_end = s->last_picref_pts;
259	✗	check_black_end(ctx);
260		}
261	✗	}
262
263		static const AVFilterPad blackdetect_inputs[] = {
264		{
265		.name = "default",
266		.type = AVMEDIA_TYPE_VIDEO,
267		.config_props = config_input,
268		.filter_frame = filter_frame,
269		},
270		};
271
272		const FFFilter ff_vf_blackdetect = {
273		.p.name = "blackdetect",
274		.p.description = NULL_IF_CONFIG_SMALL("Detect video intervals that are (almost) black."),
275		.p.priv_class = &blackdetect_class,
276		.p.flags = AVFILTER_FLAG_SLICE_THREADS \| AVFILTER_FLAG_METADATA_ONLY,
277		.priv_size = sizeof(BlackDetectContext),
278		FILTER_INPUTS(blackdetect_inputs),
279		FILTER_OUTPUTS(ff_video_default_filterpad),
280		FILTER_QUERY_FUNC2(query_format),
281		.uninit = uninit,
282		};
283

Function (Line)	Call count	Block coverage
black_counter (line 159)	not called	0.0%
check_black_end (line 146)	not called	0.0%
config_input (line 124)	not called	0.0%
filter_frame (line 198)	not called	0.0%
query_format (line 110)	not called	0.0%
uninit (line 250)	not called	0.0%