h264_metadata: Add option to delete filler data
[libav.git] / libavfilter / vf_blackframe.c
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13fabd7a 1/*
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2 * Copyright (c) 2010 Stefano Sabatini
3 * Copyright (c) 2006 Ivo van Poorten
4 * Copyright (c) 2006 Julian Hall
5 * Copyright (c) 2002-2003 Brian J. Murrell
13fabd7a 6 *
2912e87a 7 * This file is part of Libav.
13fabd7a 8 *
2912e87a 9 * Libav is free software; you can redistribute it and/or modify
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10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
2912e87a 14 * Libav is distributed in the hope that it will be useful,
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15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License along
2912e87a 20 * with Libav; if not, write to the Free Software Foundation, Inc.,
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21 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
22 */
23
24/**
25 * @file
26 * Search for black frames to detect scene transitions.
27 * Ported from MPlayer libmpcodecs/vf_blackframe.c.
28 */
29
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30#include <stdio.h>
31#include <inttypes.h>
32
33#include "libavutil/internal.h"
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34#include "libavutil/opt.h"
35
13fabd7a 36#include "avfilter.h"
b74a1da4 37#include "formats.h"
9d0bfc50 38#include "internal.h"
c04c533f 39#include "video.h"
13fabd7a 40
58400ac1 41typedef struct BlackFrameContext {
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42 const AVClass *class;
43 int bamount; ///< black amount
44 int bthresh; ///< black threshold
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45 unsigned int frame; ///< frame number
46 unsigned int nblack; ///< number of black pixels counted so far
47} BlackFrameContext;
48
49static int query_formats(AVFilterContext *ctx)
50{
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51 static const enum AVPixelFormat pix_fmts[] = {
52 AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NV12,
53 AV_PIX_FMT_NV21, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV411P,
54 AV_PIX_FMT_NONE
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55 };
56
b74a1da4 57 ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
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58 return 0;
59}
60
7e350379 61static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
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62{
63 AVFilterContext *ctx = inlink->dst;
a2a69699 64 BlackFrameContext *s = ctx->priv;
13fabd7a 65 int x, i;
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66 int pblack = 0;
67 uint8_t *p = frame->data[0];
13fabd7a 68
7e350379 69 for (i = 0; i < frame->height; i++) {
13fabd7a 70 for (x = 0; x < inlink->w; x++)
a2a69699 71 s->nblack += p[x] < s->bthresh;
565e4993 72 p += frame->linesize[0];
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73 }
74
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75 pblack = s->nblack * 100 / (inlink->w * inlink->h);
76 if (pblack >= s->bamount)
7e350379 77 av_log(ctx, AV_LOG_INFO, "frame:%u pblack:%u pts:%"PRId64" t:%f\n",
a2a69699 78 s->frame, pblack, frame->pts,
565e4993 79 frame->pts == AV_NOPTS_VALUE ? -1 : frame->pts * av_q2d(inlink->time_base));
13fabd7a 80
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81 s->frame++;
82 s->nblack = 0;
565e4993 83 return ff_filter_frame(inlink->dst->outputs[0], frame);
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84}
85
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86#define OFFSET(x) offsetof(BlackFrameContext, x)
87#define FLAGS AV_OPT_FLAG_VIDEO_PARAM
88static const AVOption options[] = {
89 { "amount", "Percentage of the pixels that have to be below the threshold "
90 "for the frame to be considered black.", OFFSET(bamount), AV_OPT_TYPE_INT, { .i64 = 98 }, 0, 100, FLAGS },
91 { "threshold", "threshold below which a pixel value is considered black",
92 OFFSET(bthresh), AV_OPT_TYPE_INT, { .i64 = 32 }, 0, INT_MAX, FLAGS },
93 { NULL },
94};
95
96static const AVClass blackframe_class = {
97 .class_name = "blackframe",
98 .item_name = av_default_item_name,
99 .option = options,
100 .version = LIBAVUTIL_VERSION_INT,
101};
102
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103static const AVFilterPad avfilter_vf_blackframe_inputs[] = {
104 {
105 .name = "default",
106 .type = AVMEDIA_TYPE_VIDEO,
568c70e7 107 .get_video_buffer = ff_null_get_video_buffer,
565e4993 108 .filter_frame = filter_frame,
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109 },
110 { NULL }
111};
112
113static const AVFilterPad avfilter_vf_blackframe_outputs[] = {
114 {
115 .name = "default",
116 .type = AVMEDIA_TYPE_VIDEO
117 },
118 { NULL }
119};
120
cd43ca04 121AVFilter ff_vf_blackframe = {
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122 .name = "blackframe",
123 .description = NULL_IF_CONFIG_SMALL("Detect frames that are (almost) black."),
124
125 .priv_size = sizeof(BlackFrameContext),
62dcdb02 126 .priv_class = &blackframe_class,
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127
128 .query_formats = query_formats,
129
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130 .inputs = avfilter_vf_blackframe_inputs,
131
132 .outputs = avfilter_vf_blackframe_outputs,
13fabd7a 133};