Function concat_read_header

libavformat/concatdec.c:661–704

}

static int concat_read_header(AVFormatContext *avf)
{
    ConcatContext *cat = avf->priv_data;
    int64_t time = 0;
    unsigned i;
    int ret;

    ret = concat_parse_script(avf);
    if (ret < 0)
        return ret;
    if (!cat->nb_files) {
        av_log(avf, AV_LOG_ERROR, "No files to concat\n");
        return AVERROR_INVALIDDATA;
    }

    for (i = 0; i < cat->nb_files; i++) {
        if (cat->files[i].start_time == AV_NOPTS_VALUE)
            cat->files[i].start_time = time;
        else
            time = cat->files[i].start_time;
        if (cat->files[i].user_duration == AV_NOPTS_VALUE) {
            if (cat->files[i].inpoint == AV_NOPTS_VALUE || cat->files[i].outpoint == AV_NOPTS_VALUE ||
                cat->files[i].outpoint - (uint64_t)cat->files[i].inpoint != av_sat_sub64(cat->files[i].outpoint, cat->files[i].inpoint)
            )
                break;
            cat->files[i].user_duration = cat->files[i].outpoint - cat->files[i].inpoint;
        }
        cat->files[i].duration = cat->files[i].user_duration;
        if (time + (uint64_t)cat->files[i].user_duration > INT64_MAX)
            return AVERROR_INVALIDDATA;
        time += cat->files[i].user_duration;
    }
    if (i == cat->nb_files) {
        avf->duration = time;
        cat->seekable = 1;
    }

    cat->stream_match_mode = avf->nb_streams ? MATCH_EXACT_ID :
                                               MATCH_ONE_TO_ONE;
    if ((ret = open_file(avf, 0)) < 0)
        return ret;

    return 0;
}

static int open_next_file(AVFormatContext *avf)
{