GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavfilter/vf_blackframe.c Lines: 0 26 0.0 %
Date: 2020-08-13 15:06:06 Branches: 0 12 0.0 %

Line Branch Exec Source
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/*
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 * Copyright (c) 2010 Stefano Sabatini
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 * Copyright (c) 2006 Ivo van Poorten
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 * Copyright (c) 2006 Julian Hall
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 * Copyright (c) 2002-2003 Brian J. Murrell
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License along
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 * with FFmpeg; if not, write to the Free Software Foundation, Inc.,
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 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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 */
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/**
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 * @file
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 * Search for black frames to detect scene transitions.
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 * Ported from MPlayer libmpcodecs/vf_blackframe.c.
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 */
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#include <stdio.h>
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#include <inttypes.h>
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#include "libavutil/internal.h"
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#include "libavutil/opt.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "internal.h"
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#include "video.h"
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typedef struct BlackFrameContext {
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    const AVClass *class;
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    int bamount;          ///< black amount
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    int bthresh;          ///< black threshold
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    unsigned int frame;   ///< frame number
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    unsigned int nblack;  ///< number of black pixels counted so far
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    unsigned int last_keyframe; ///< frame number of the last received key-frame
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} BlackFrameContext;
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static int query_formats(AVFilterContext *ctx)
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{
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    static const enum AVPixelFormat pix_fmts[] = {
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        AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NV12,
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        AV_PIX_FMT_NV21, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV411P,
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        AV_PIX_FMT_NONE
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    };
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    AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
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    if (!fmts_list)
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        return AVERROR(ENOMEM);
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    return ff_set_common_formats(ctx, fmts_list);
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}
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#define SET_META(key, format, value) \
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    snprintf(buf, sizeof(buf), format, value);  \
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    av_dict_set(metadata, key, buf, 0)
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static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
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{
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    AVFilterContext *ctx = inlink->dst;
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    BlackFrameContext *s = ctx->priv;
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    int x, i;
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    int pblack = 0;
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    uint8_t *p = frame->data[0];
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    AVDictionary **metadata;
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    char buf[32];
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    for (i = 0; i < frame->height; i++) {
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        for (x = 0; x < inlink->w; x++)
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            s->nblack += p[x] < s->bthresh;
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        p += frame->linesize[0];
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    }
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    if (frame->key_frame)
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        s->last_keyframe = s->frame;
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    pblack = s->nblack * 100 / (inlink->w * inlink->h);
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    if (pblack >= s->bamount) {
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        metadata = &frame->metadata;
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        av_log(ctx, AV_LOG_INFO, "frame:%u pblack:%u pts:%"PRId64" t:%f "
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               "type:%c last_keyframe:%d\n",
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               s->frame, pblack, frame->pts,
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               frame->pts == AV_NOPTS_VALUE ? -1 : frame->pts * av_q2d(inlink->time_base),
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               av_get_picture_type_char(frame->pict_type), s->last_keyframe);
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        SET_META("lavfi.blackframe.pblack", "%u", pblack);
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    }
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    s->frame++;
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    s->nblack = 0;
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    return ff_filter_frame(inlink->dst->outputs[0], frame);
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}
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#define OFFSET(x) offsetof(BlackFrameContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption blackframe_options[] = {
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    { "amount", "percentage of the pixels that have to be below the threshold "
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        "for the frame to be considered black",  OFFSET(bamount), AV_OPT_TYPE_INT, { .i64 = 98 }, 0, 100,     FLAGS },
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    { "threshold", "threshold below which a pixel value is considered black",
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                                                 OFFSET(bthresh), AV_OPT_TYPE_INT, { .i64 = 32 }, 0, 255,     FLAGS },
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    { "thresh", "threshold below which a pixel value is considered black",
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                                                 OFFSET(bthresh), AV_OPT_TYPE_INT, { .i64 = 32 }, 0, 255,     FLAGS },
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    { NULL }
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};
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AVFILTER_DEFINE_CLASS(blackframe);
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static const AVFilterPad avfilter_vf_blackframe_inputs[] = {
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    {
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        .name         = "default",
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        .type         = AVMEDIA_TYPE_VIDEO,
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        .filter_frame = filter_frame,
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    },
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    { NULL }
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};
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static const AVFilterPad avfilter_vf_blackframe_outputs[] = {
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    {
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        .name = "default",
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        .type = AVMEDIA_TYPE_VIDEO
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    },
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    { NULL }
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};
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AVFilter ff_vf_blackframe = {
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    .name          = "blackframe",
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    .description   = NULL_IF_CONFIG_SMALL("Detect frames that are (almost) black."),
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    .priv_size     = sizeof(BlackFrameContext),
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    .priv_class    = &blackframe_class,
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    .query_formats = query_formats,
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    .inputs        = avfilter_vf_blackframe_inputs,
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    .outputs       = avfilter_vf_blackframe_outputs,
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};