| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 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 | ||
| 6 | * | ||
| 7 | * This file is part of FFmpeg. | ||
| 8 | * | ||
| 9 | * FFmpeg is free software; you can redistribute it and/or modify | ||
| 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 | * | ||
| 14 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 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 | ||
| 20 | * with FFmpeg; if not, write to the Free Software Foundation, Inc., | ||
| 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 | |||
| 30 | #include <stdio.h> | ||
| 31 | #include <inttypes.h> | ||
| 32 | |||
| 33 | #include "libavutil/internal.h" | ||
| 34 | #include "libavutil/opt.h" | ||
| 35 | #include "avfilter.h" | ||
| 36 | #include "filters.h" | ||
| 37 | #include "video.h" | ||
| 38 | |||
| 39 | typedef struct BlackFrameContext { | ||
| 40 | const AVClass *class; | ||
| 41 | int bamount; ///< black amount | ||
| 42 | int bthresh; ///< black threshold | ||
| 43 | unsigned int frame; ///< frame number | ||
| 44 | unsigned int nblack; ///< number of black pixels counted so far | ||
| 45 | unsigned int last_keyframe; ///< frame number of the last received key-frame | ||
| 46 | } BlackFrameContext; | ||
| 47 | |||
| 48 | static const enum AVPixelFormat pix_fmts[] = { | ||
| 49 | AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NV12, | ||
| 50 | AV_PIX_FMT_NV21, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV411P, | ||
| 51 | AV_PIX_FMT_NONE | ||
| 52 | }; | ||
| 53 | |||
| 54 | #define SET_META(key, format, value) \ | ||
| 55 | snprintf(buf, sizeof(buf), format, value); \ | ||
| 56 | av_dict_set(metadata, key, buf, 0) | ||
| 57 | |||
| 58 | ✗ | static int filter_frame(AVFilterLink *inlink, AVFrame *frame) | |
| 59 | { | ||
| 60 | ✗ | AVFilterContext *ctx = inlink->dst; | |
| 61 | ✗ | BlackFrameContext *s = ctx->priv; | |
| 62 | int x, i; | ||
| 63 | ✗ | int pblack = 0; | |
| 64 | ✗ | uint8_t *p = frame->data[0]; | |
| 65 | AVDictionary **metadata; | ||
| 66 | char buf[32]; | ||
| 67 | |||
| 68 | ✗ | for (i = 0; i < frame->height; i++) { | |
| 69 | ✗ | for (x = 0; x < inlink->w; x++) | |
| 70 | ✗ | s->nblack += p[x] < s->bthresh; | |
| 71 | ✗ | p += frame->linesize[0]; | |
| 72 | } | ||
| 73 | |||
| 74 | ✗ | if (frame->flags & AV_FRAME_FLAG_KEY) | |
| 75 | ✗ | s->last_keyframe = s->frame; | |
| 76 | |||
| 77 | ✗ | pblack = s->nblack * 100 / (inlink->w * inlink->h); | |
| 78 | ✗ | if (pblack >= s->bamount) { | |
| 79 | ✗ | metadata = &frame->metadata; | |
| 80 | |||
| 81 | ✗ | av_log(ctx, AV_LOG_INFO, "frame:%u pblack:%u pts:%"PRId64" t:%f " | |
| 82 | "type:%c last_keyframe:%d\n", | ||
| 83 | s->frame, pblack, frame->pts, | ||
| 84 | ✗ | frame->pts == AV_NOPTS_VALUE ? -1 : frame->pts * av_q2d(inlink->time_base), | |
| 85 | ✗ | av_get_picture_type_char(frame->pict_type), s->last_keyframe); | |
| 86 | |||
| 87 | ✗ | SET_META("lavfi.blackframe.pblack", "%u", pblack); | |
| 88 | } | ||
| 89 | |||
| 90 | ✗ | s->frame++; | |
| 91 | ✗ | s->nblack = 0; | |
| 92 | ✗ | return ff_filter_frame(inlink->dst->outputs[0], frame); | |
| 93 | } | ||
| 94 | |||
| 95 | #define OFFSET(x) offsetof(BlackFrameContext, x) | ||
| 96 | #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM | ||
| 97 | static const AVOption blackframe_options[] = { | ||
| 98 | { "amount", "percentage of the pixels that have to be below the threshold " | ||
| 99 | "for the frame to be considered black", OFFSET(bamount), AV_OPT_TYPE_INT, { .i64 = 98 }, 0, 100, FLAGS }, | ||
| 100 | { "threshold", "threshold below which a pixel value is considered black", | ||
| 101 | OFFSET(bthresh), AV_OPT_TYPE_INT, { .i64 = 32 }, 0, 255, FLAGS }, | ||
| 102 | { "thresh", "threshold below which a pixel value is considered black", | ||
| 103 | OFFSET(bthresh), AV_OPT_TYPE_INT, { .i64 = 32 }, 0, 255, FLAGS }, | ||
| 104 | { NULL } | ||
| 105 | }; | ||
| 106 | |||
| 107 | AVFILTER_DEFINE_CLASS(blackframe); | ||
| 108 | |||
| 109 | static const AVFilterPad avfilter_vf_blackframe_inputs[] = { | ||
| 110 | { | ||
| 111 | .name = "default", | ||
| 112 | .type = AVMEDIA_TYPE_VIDEO, | ||
| 113 | .filter_frame = filter_frame, | ||
| 114 | }, | ||
| 115 | }; | ||
| 116 | |||
| 117 | const FFFilter ff_vf_blackframe = { | ||
| 118 | .p.name = "blackframe", | ||
| 119 | .p.description = NULL_IF_CONFIG_SMALL("Detect frames that are (almost) black."), | ||
| 120 | .p.priv_class = &blackframe_class, | ||
| 121 | .p.flags = AVFILTER_FLAG_METADATA_ONLY, | ||
| 122 | .priv_size = sizeof(BlackFrameContext), | ||
| 123 | FILTER_INPUTS(avfilter_vf_blackframe_inputs), | ||
| 124 | FILTER_OUTPUTS(ff_video_default_filterpad), | ||
| 125 | FILTER_PIXFMTS_ARRAY(pix_fmts), | ||
| 126 | }; | ||
| 127 |