FFmpeg coverage

GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavfilter/vf_blackdetect.c	Lines:	0	61	0.0 %
Date:	2021-01-26 11:44:58	Branches:	0	20	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/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
} 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_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 *blackdetect = ctx->priv;

    blackdetect->black_min_duration =
        blackdetect->black_min_duration_time / av_q2d(inlink->time_base);

    blackdetect->pixel_black_th_i = ff_fmt_is_in(inlink->format, yuvj_formats) ?
        // luminance_minimum_value + pixel_black_th * luminance_range_size
             blackdetect->pixel_black_th *  255 :
        16 + blackdetect->pixel_black_th * (235 - 16);

    av_log(blackdetect, AV_LOG_VERBOSE,
           "black_min_duration:%s pixel_black_th:%f pixel_black_th_i:%d picture_black_ratio_th:%f\n",
           av_ts2timestr(blackdetect->black_min_duration, &inlink->time_base),
           blackdetect->pixel_black_th, blackdetect->pixel_black_th_i,
           blackdetect->picture_black_ratio_th);
    return 0;
}

static void check_black_end(AVFilterContext *ctx)
{
    BlackDetectContext *blackdetect = ctx->priv;
    AVFilterLink *inlink = ctx->inputs[0];

    if ((blackdetect->black_end - blackdetect->black_start) >= blackdetect->black_min_duration) {
        av_log(blackdetect, AV_LOG_INFO,
               "black_start:%s black_end:%s black_duration:%s\n",
               av_ts2timestr(blackdetect->black_start, &inlink->time_base),
               av_ts2timestr(blackdetect->black_end,   &inlink->time_base),
               av_ts2timestr(blackdetect->black_end - blackdetect->black_start, &inlink->time_base));
    }
}

static int request_frame(AVFilterLink *outlink)
{
    AVFilterContext *ctx = outlink->src;
    BlackDetectContext *blackdetect = ctx->priv;
    AVFilterLink *inlink = ctx->inputs[0];
    int ret = ff_request_frame(inlink);

    if (ret == AVERROR_EOF && blackdetect->black_started) {
        // FIXME: black_end should be set to last_picref_pts + last_picref_duration
        blackdetect->black_end = blackdetect->last_picref_pts;
        check_black_end(ctx);
    }
    return ret;
}

static int filter_frame(AVFilterLink *inlink, AVFrame *picref)
{
    AVFilterContext *ctx = inlink->dst;
    BlackDetectContext *blackdetect = ctx->priv;
    double picture_black_ratio = 0;
    const uint8_t *p = picref->data[0];
    int x, i;

    for (i = 0; i < inlink->h; i++) {
        for (x = 0; x < inlink->w; x++)
            blackdetect->nb_black_pixels += p[x] <= blackdetect->pixel_black_th_i;
        p += picref->linesize[0];
    }

    picture_black_ratio = (double)blackdetect->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, &inlink->time_base),
           av_get_picture_type_char(picref->pict_type));

    if (picture_black_ratio >= blackdetect->picture_black_ratio_th) {
        if (!blackdetect->black_started) {
            /* black starts here */
            blackdetect->black_started = 1;
            blackdetect->black_start = picref->pts;
            av_dict_set(&picref->metadata, "lavfi.black_start",
                av_ts2timestr(blackdetect->black_start, &inlink->time_base), 0);
        }
    } else if (blackdetect->black_started) {
        /* black ends here */
        blackdetect->black_started = 0;
        blackdetect->black_end = picref->pts;
        check_black_end(ctx);
        av_dict_set(&picref->metadata, "lavfi.black_end",
            av_ts2timestr(blackdetect->black_end, &inlink->time_base), 0);
    }

    blackdetect->last_picref_pts = picref->pts;
    blackdetect->nb_black_pixels = 0;
    return ff_filter_frame(inlink->dst->outputs[0], picref);
}

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,
        .request_frame = request_frame,
    },
    { 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,
    .priv_class    = &blackdetect_class,
};


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/timestamp.h"
30			#include "avfilter.h"
31			#include "internal.h"
32
33			typedef struct BlackDetectContext {
34			const AVClass *class;
35			double black_min_duration_time; ///< minimum duration of detected black, in seconds
36			int64_t black_min_duration; ///< minimum duration of detected black, expressed in timebase units
37			int64_t black_start; ///< pts start time of the first black picture
38			int64_t black_end; ///< pts end time of the last black picture
39			int64_t last_picref_pts; ///< pts of the last input picture
40			int black_started;
41
42			double picture_black_ratio_th;
43			double pixel_black_th;
44			unsigned int pixel_black_th_i;
45
46			unsigned int nb_black_pixels; ///< number of black pixels counted so far
47			} BlackDetectContext;
48
49			#define OFFSET(x) offsetof(BlackDetectContext, x)
50			#define FLAGS AV_OPT_FLAG_VIDEO_PARAM\|AV_OPT_FLAG_FILTERING_PARAM
51
52			static const AVOption blackdetect_options[] = {
53			{ "d", "set minimum detected black duration in seconds", OFFSET(black_min_duration_time), AV_OPT_TYPE_DOUBLE, {.dbl=2}, 0, DBL_MAX, FLAGS },
54			{ "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 },
55			{ "picture_black_ratio_th", "set the picture black ratio threshold", OFFSET(picture_black_ratio_th), AV_OPT_TYPE_DOUBLE, {.dbl=.98}, 0, 1, FLAGS },
56			{ "pic_th", "set the picture black ratio threshold", OFFSET(picture_black_ratio_th), AV_OPT_TYPE_DOUBLE, {.dbl=.98}, 0, 1, FLAGS },
57			{ "pixel_black_th", "set the pixel black threshold", OFFSET(pixel_black_th), AV_OPT_TYPE_DOUBLE, {.dbl=.10}, 0, 1, FLAGS },
58			{ "pix_th", "set the pixel black threshold", OFFSET(pixel_black_th), AV_OPT_TYPE_DOUBLE, {.dbl=.10}, 0, 1, FLAGS },
59			{ NULL }
60			};
61
62			AVFILTER_DEFINE_CLASS(blackdetect);
63
64			#define YUVJ_FORMATS \
65			AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P
66
67			static const enum AVPixelFormat yuvj_formats[] = {
68			YUVJ_FORMATS, AV_PIX_FMT_NONE
69			};
70
71			static int query_formats(AVFilterContext *ctx)
72			{
73			static const enum AVPixelFormat pix_fmts[] = {
74			AV_PIX_FMT_GRAY8,
75			AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,
76			AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
77			AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
78			AV_PIX_FMT_NV12, AV_PIX_FMT_NV21,
79			YUVJ_FORMATS,
80			AV_PIX_FMT_NONE
81			};
82
83			AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
84			if (!fmts_list)
85			return AVERROR(ENOMEM);
86			return ff_set_common_formats(ctx, fmts_list);
87			}
88
89			static int config_input(AVFilterLink *inlink)
90			{
91			AVFilterContext *ctx = inlink->dst;
92			BlackDetectContext *blackdetect = ctx->priv;
93
94			blackdetect->black_min_duration =
95			blackdetect->black_min_duration_time / av_q2d(inlink->time_base);
96
97			blackdetect->pixel_black_th_i = ff_fmt_is_in(inlink->format, yuvj_formats) ?
98			// luminance_minimum_value + pixel_black_th * luminance_range_size
99			blackdetect->pixel_black_th * 255 :
100			16 + blackdetect->pixel_black_th * (235 - 16);
101
102			av_log(blackdetect, AV_LOG_VERBOSE,
103			"black_min_duration:%s pixel_black_th:%f pixel_black_th_i:%d picture_black_ratio_th:%f\n",
104			av_ts2timestr(blackdetect->black_min_duration, &inlink->time_base),
105			blackdetect->pixel_black_th, blackdetect->pixel_black_th_i,
106			blackdetect->picture_black_ratio_th);
107			return 0;
108			}
109
110			static void check_black_end(AVFilterContext *ctx)
111			{
112			BlackDetectContext *blackdetect = ctx->priv;
113			AVFilterLink *inlink = ctx->inputs[0];
114
115			if ((blackdetect->black_end - blackdetect->black_start) >= blackdetect->black_min_duration) {
116			av_log(blackdetect, AV_LOG_INFO,
117			"black_start:%s black_end:%s black_duration:%s\n",
118			av_ts2timestr(blackdetect->black_start, &inlink->time_base),
119			av_ts2timestr(blackdetect->black_end, &inlink->time_base),
120			av_ts2timestr(blackdetect->black_end - blackdetect->black_start, &inlink->time_base));
121			}
122			}
123
124			static int request_frame(AVFilterLink *outlink)
125			{
126			AVFilterContext *ctx = outlink->src;
127			BlackDetectContext *blackdetect = ctx->priv;
128			AVFilterLink *inlink = ctx->inputs[0];
129			int ret = ff_request_frame(inlink);
130
131			if (ret == AVERROR_EOF && blackdetect->black_started) {
132			// FIXME: black_end should be set to last_picref_pts + last_picref_duration
133			blackdetect->black_end = blackdetect->last_picref_pts;
134			check_black_end(ctx);
135			}
136			return ret;
137			}
138
139			static int filter_frame(AVFilterLink inlink, AVFrame picref)
140			{
141			AVFilterContext *ctx = inlink->dst;
142			BlackDetectContext *blackdetect = ctx->priv;
143			double picture_black_ratio = 0;
144			const uint8_t *p = picref->data[0];
145			int x, i;
146
147			for (i = 0; i < inlink->h; i++) {
148			for (x = 0; x < inlink->w; x++)
149			blackdetect->nb_black_pixels += p[x] <= blackdetect->pixel_black_th_i;
150			p += picref->linesize[0];
151			}
152
153			picture_black_ratio = (double)blackdetect->nb_black_pixels / (inlink->w * inlink->h);
154
155			av_log(ctx, AV_LOG_DEBUG,
156			"frame:%"PRId64" picture_black_ratio:%f pts:%s t:%s type:%c\n",
157			inlink->frame_count_out, picture_black_ratio,
158			av_ts2str(picref->pts), av_ts2timestr(picref->pts, &inlink->time_base),
159			av_get_picture_type_char(picref->pict_type));
160
161			if (picture_black_ratio >= blackdetect->picture_black_ratio_th) {
162			if (!blackdetect->black_started) {
163			/* black starts here */
164			blackdetect->black_started = 1;
165			blackdetect->black_start = picref->pts;
166			av_dict_set(&picref->metadata, "lavfi.black_start",
167			av_ts2timestr(blackdetect->black_start, &inlink->time_base), 0);
168			}
169			} else if (blackdetect->black_started) {
170			/* black ends here */
171			blackdetect->black_started = 0;
172			blackdetect->black_end = picref->pts;
173			check_black_end(ctx);
174			av_dict_set(&picref->metadata, "lavfi.black_end",
175			av_ts2timestr(blackdetect->black_end, &inlink->time_base), 0);
176			}
177
178			blackdetect->last_picref_pts = picref->pts;
179			blackdetect->nb_black_pixels = 0;
180			return ff_filter_frame(inlink->dst->outputs[0], picref);
181			}
182
183			static const AVFilterPad blackdetect_inputs[] = {
184			{
185			.name = "default",
186			.type = AVMEDIA_TYPE_VIDEO,
187			.config_props = config_input,
188			.filter_frame = filter_frame,
189			},
190			{ NULL }
191			};
192
193			static const AVFilterPad blackdetect_outputs[] = {
194			{
195			.name = "default",
196			.type = AVMEDIA_TYPE_VIDEO,
197			.request_frame = request_frame,
198			},
199			{ NULL }
200			};
201
202			AVFilter ff_vf_blackdetect = {
203			.name = "blackdetect",
204			.description = NULL_IF_CONFIG_SMALL("Detect video intervals that are (almost) black."),
205			.priv_size = sizeof(BlackDetectContext),
206			.query_formats = query_formats,
207			.inputs = blackdetect_inputs,
208			.outputs = blackdetect_outputs,
209			.priv_class = &blackdetect_class,
210			};