FFmpeg coverage

GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavfilter/vf_blackdetect.c	Lines:	0	90	0.0 %
Date:	2021-04-22 14:24:15	Branches:	0	28	0.0 %


/*
 * 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/opt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/timestamp.h"
#include "avfilter.h"
#include "internal.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;

    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 },
    { 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

static const enum AVPixelFormat yuvj_formats[] = {
    YUVJ_FORMATS, AV_PIX_FMT_NONE
};

static int query_formats(AVFilterContext *ctx)
{
    static const enum AVPixelFormat pix_fmts[] = {
        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,
        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,
        AV_PIX_FMT_NONE
    };

    AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
    if (!fmts_list)
        return AVERROR(ENOMEM);
    return ff_set_common_formats(ctx, fmts_list);
}

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;
    const int max = (1 << depth) - 1;
    const int factor = (1 << (depth - 8));

    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);

    s->pixel_black_th_i = ff_fmt_is_in(inlink->format, yuvj_formats) ?
        // luminance_minimum_value + pixel_black_th * luminance_range_size
             s->pixel_black_th *  max :
        16 * factor + s->pixel_black_th * (235 - 16) * factor;

    av_log(s, AV_LOG_VERBOSE,
           "black_min_duration:%s pixel_black_th:%f pixel_black_th_i:%d picture_black_ratio_th:%f\n",
           av_ts2timestr(s->black_min_duration, &s->time_base),
           s->pixel_black_th, s->pixel_black_th_i,
           s->picture_black_ratio_th);
    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 linesize = in->linesize[0];
    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[0] + 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[0] + 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)
{
    AVFilterContext *ctx = inlink->dst;
    BlackDetectContext *s = ctx->priv;
    double picture_black_ratio = 0;

    ctx->internal->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",
           inlink->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,
    },
    { NULL }
};

static const AVFilterPad blackdetect_outputs[] = {
    {
        .name          = "default",
        .type          = AVMEDIA_TYPE_VIDEO,
    },
    { NULL }
};

AVFilter ff_vf_blackdetect = {
    .name          = "blackdetect",
    .description   = NULL_IF_CONFIG_SMALL("Detect video intervals that are (almost) black."),
    .priv_size     = sizeof(BlackDetectContext),
    .query_formats = query_formats,
    .inputs        = blackdetect_inputs,
    .outputs       = blackdetect_outputs,
    .uninit        = uninit,
    .priv_class    = &blackdetect_class,
    .flags         = AVFILTER_FLAG_SLICE_THREADS,
};


Generated by: GCOVR (Version 4.2)

Line	Branch	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/opt.h"
29			#include "libavutil/pixdesc.h"
30			#include "libavutil/timestamp.h"
31			#include "avfilter.h"
32			#include "internal.h"
33
34			typedef struct BlackDetectContext {
35			const AVClass *class;
36			double black_min_duration_time; ///< minimum duration of detected black, in seconds
37			int64_t black_min_duration; ///< minimum duration of detected black, expressed in timebase units
38			int64_t black_start; ///< pts start time of the first black picture
39			int64_t black_end; ///< pts end time of the last black picture
40			int64_t last_picref_pts; ///< pts of the last input picture
41			int black_started;
42
43			double picture_black_ratio_th;
44			double pixel_black_th;
45			unsigned int pixel_black_th_i;
46
47			unsigned int nb_black_pixels; ///< number of black pixels counted so far
48			AVRational time_base;
49			int depth;
50			int nb_threads;
51			unsigned int *counter;
52			} BlackDetectContext;
53
54			#define OFFSET(x) offsetof(BlackDetectContext, x)
55			#define FLAGS AV_OPT_FLAG_VIDEO_PARAM\|AV_OPT_FLAG_FILTERING_PARAM
56
57			static const AVOption blackdetect_options[] = {
58			{ "d", "set minimum detected black duration in seconds", OFFSET(black_min_duration_time), AV_OPT_TYPE_DOUBLE, {.dbl=2}, 0, DBL_MAX, FLAGS },
59			{ "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 },
60			{ "picture_black_ratio_th", "set the picture black ratio threshold", OFFSET(picture_black_ratio_th), AV_OPT_TYPE_DOUBLE, {.dbl=.98}, 0, 1, FLAGS },
61			{ "pic_th", "set the picture black ratio threshold", OFFSET(picture_black_ratio_th), AV_OPT_TYPE_DOUBLE, {.dbl=.98}, 0, 1, FLAGS },
62			{ "pixel_black_th", "set the pixel black threshold", OFFSET(pixel_black_th), AV_OPT_TYPE_DOUBLE, {.dbl=.10}, 0, 1, FLAGS },
63			{ "pix_th", "set the pixel black threshold", OFFSET(pixel_black_th), AV_OPT_TYPE_DOUBLE, {.dbl=.10}, 0, 1, FLAGS },
64			{ NULL }
65			};
66
67			AVFILTER_DEFINE_CLASS(blackdetect);
68
69			#define YUVJ_FORMATS \
70			AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P
71
72			static const enum AVPixelFormat yuvj_formats[] = {
73			YUVJ_FORMATS, AV_PIX_FMT_NONE
74			};
75
76			static int query_formats(AVFilterContext *ctx)
77			{
78			static const enum AVPixelFormat pix_fmts[] = {
79			AV_PIX_FMT_GRAY8,
80			AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,
81			AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
82			AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
83			AV_PIX_FMT_NV12, AV_PIX_FMT_NV21,
84			YUVJ_FORMATS,
85			AV_PIX_FMT_GRAY10, AV_PIX_FMT_GRAY12, AV_PIX_FMT_GRAY14,
86			AV_PIX_FMT_GRAY16,
87			AV_PIX_FMT_YUV420P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV444P9,
88			AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV444P10,
89			AV_PIX_FMT_YUV440P10,
90			AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV420P12,
91			AV_PIX_FMT_YUV440P12,
92			AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV420P14,
93			AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
94			AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,
95			AV_PIX_FMT_YUVA444P9, AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA444P12, AV_PIX_FMT_YUVA444P16,
96			AV_PIX_FMT_YUVA422P9, AV_PIX_FMT_YUVA422P10, AV_PIX_FMT_YUVA422P12, AV_PIX_FMT_YUVA422P16,
97			AV_PIX_FMT_YUVA420P9, AV_PIX_FMT_YUVA420P10, AV_PIX_FMT_YUVA420P16,
98			AV_PIX_FMT_NONE
99			};
100
101			AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
102			if (!fmts_list)
103			return AVERROR(ENOMEM);
104			return ff_set_common_formats(ctx, fmts_list);
105			}
106
107			static int config_input(AVFilterLink *inlink)
108			{
109			AVFilterContext *ctx = inlink->dst;
110			BlackDetectContext *s = ctx->priv;
111			const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
112			const int depth = desc->comp[0].depth;
113			const int max = (1 << depth) - 1;
114			const int factor = (1 << (depth - 8));
115
116			s->depth = depth;
117			s->nb_threads = ff_filter_get_nb_threads(ctx);
118			s->time_base = inlink->time_base;
119			s->black_min_duration = s->black_min_duration_time / av_q2d(s->time_base);
120			s->counter = av_calloc(s->nb_threads, sizeof(*s->counter));
121			if (!s->counter)
122			return AVERROR(ENOMEM);
123
124			s->pixel_black_th_i = ff_fmt_is_in(inlink->format, yuvj_formats) ?
125			// luminance_minimum_value + pixel_black_th * luminance_range_size
126			s->pixel_black_th * max :
127			16 * factor + s->pixel_black_th * (235 - 16) * factor;
128
129			av_log(s, AV_LOG_VERBOSE,
130			"black_min_duration:%s pixel_black_th:%f pixel_black_th_i:%d picture_black_ratio_th:%f\n",
131			av_ts2timestr(s->black_min_duration, &s->time_base),
132			s->pixel_black_th, s->pixel_black_th_i,
133			s->picture_black_ratio_th);
134			return 0;
135			}
136
137			static void check_black_end(AVFilterContext *ctx)
138			{
139			BlackDetectContext *s = ctx->priv;
140
141			if ((s->black_end - s->black_start) >= s->black_min_duration) {
142			av_log(s, AV_LOG_INFO,
143			"black_start:%s black_end:%s black_duration:%s\n",
144			av_ts2timestr(s->black_start, &s->time_base),
145			av_ts2timestr(s->black_end, &s->time_base),
146			av_ts2timestr(s->black_end - s->black_start, &s->time_base));
147			}
148			}
149
150			static int black_counter(AVFilterContext ctx, void arg,
151			int jobnr, int nb_jobs)
152			{
153			BlackDetectContext *s = ctx->priv;
154			const unsigned int threshold = s->pixel_black_th_i;
155			unsigned int *counterp = &s->counter[jobnr];
156			AVFrame *in = arg;
157			const int linesize = in->linesize[0];
158			const int w = in->width;
159			const int h = in->height;
160			const int start = (h * jobnr) / nb_jobs;
161			const int end = (h * (jobnr+1)) / nb_jobs;
162			const int size = end - start;
163			unsigned int counter = 0;
164
165			if (s->depth == 8) {
166			const uint8_t p = in->data[0] + start linesize;
167
168			for (int i = 0; i < size; i++) {
169			for (int x = 0; x < w; x++)
170			counter += p[x] <= threshold;
171			p += linesize;
172			}
173			} else {
174			const uint16_t p = (const uint16_t )(in->data[0] + start * linesize);
175
176			for (int i = 0; i < size; i++) {
177			for (int x = 0; x < w; x++)
178			counter += p[x] <= threshold;
179			p += linesize / 2;
180			}
181			}
182
183			*counterp = counter;
184
185			return 0;
186			}
187
188			static int filter_frame(AVFilterLink inlink, AVFrame picref)
189			{
190			AVFilterContext *ctx = inlink->dst;
191			BlackDetectContext *s = ctx->priv;
192			double picture_black_ratio = 0;
193
194			ctx->internal->execute(ctx, black_counter, picref, NULL,
195			FFMIN(inlink->h, s->nb_threads));
196
197			for (int i = 0; i < s->nb_threads; i++)
198			s->nb_black_pixels += s->counter[i];
199
200			picture_black_ratio = (double)s->nb_black_pixels / (inlink->w * inlink->h);
201
202			av_log(ctx, AV_LOG_DEBUG,
203			"frame:%"PRId64" picture_black_ratio:%f pts:%s t:%s type:%c\n",
204			inlink->frame_count_out, picture_black_ratio,
205			av_ts2str(picref->pts), av_ts2timestr(picref->pts, &s->time_base),
206			av_get_picture_type_char(picref->pict_type));
207
208			if (picture_black_ratio >= s->picture_black_ratio_th) {
209			if (!s->black_started) {
210			/* black starts here */
211			s->black_started = 1;
212			s->black_start = picref->pts;
213			av_dict_set(&picref->metadata, "lavfi.black_start",
214			av_ts2timestr(s->black_start, &s->time_base), 0);
215			}
216			} else if (s->black_started) {
217			/* black ends here */
218			s->black_started = 0;
219			s->black_end = picref->pts;
220			check_black_end(ctx);
221			av_dict_set(&picref->metadata, "lavfi.black_end",
222			av_ts2timestr(s->black_end, &s->time_base), 0);
223			}
224
225			s->last_picref_pts = picref->pts;
226			s->nb_black_pixels = 0;
227			return ff_filter_frame(inlink->dst->outputs[0], picref);
228			}
229
230			static av_cold void uninit(AVFilterContext *ctx)
231			{
232			BlackDetectContext *s = ctx->priv;
233
234			av_freep(&s->counter);
235
236			if (s->black_started) {
237			// FIXME: black_end should be set to last_picref_pts + last_picref_duration
238			s->black_end = s->last_picref_pts;
239			check_black_end(ctx);
240			}
241			}
242
243			static const AVFilterPad blackdetect_inputs[] = {
244			{
245			.name = "default",
246			.type = AVMEDIA_TYPE_VIDEO,
247			.config_props = config_input,
248			.filter_frame = filter_frame,
249			},
250			{ NULL }
251			};
252
253			static const AVFilterPad blackdetect_outputs[] = {
254			{
255			.name = "default",
256			.type = AVMEDIA_TYPE_VIDEO,
257			},
258			{ NULL }
259			};
260
261			AVFilter ff_vf_blackdetect = {
262			.name = "blackdetect",
263			.description = NULL_IF_CONFIG_SMALL("Detect video intervals that are (almost) black."),
264			.priv_size = sizeof(BlackDetectContext),
265			.query_formats = query_formats,
266			.inputs = blackdetect_inputs,
267			.outputs = blackdetect_outputs,
268			.uninit = uninit,
269			.priv_class = &blackdetect_class,
270			.flags = AVFILTER_FLAG_SLICE_THREADS,
271			};