Function srt_read_header

libavformat/srtdec.c:129–215

}

static int srt_read_header(AVFormatContext *s)
{
    SRTContext *srt = s->priv_data;
    AVBPrint buf;
    AVStream *st = avformat_new_stream(s, NULL);
    int res = 0;
    char line[4096], line_cache[4096];
    int has_event_info = 0;
    struct event_info ei;
    FFTextReader tr;
    ff_text_init_avio(s, &tr, s->pb);

    if (!st)
        return AVERROR(ENOMEM);
    avpriv_set_pts_info(st, 64, 1, 1000);
    st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
    st->codecpar->codec_id   = AV_CODEC_ID_SUBRIP;

    av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);

    line_cache[0] = 0;

    while (!ff_text_eof(&tr)) {
        struct event_info tmp_ei;
        const int64_t pos = ff_text_pos(&tr);
        ptrdiff_t len = ff_subtitles_read_line(&tr, line, sizeof(line));

        if (len < 0)
            break;

        if (!len || !line[0])
            continue;

        if (get_event_info(line, &tmp_ei) < 0) {
            char *pline;

            if (!has_event_info)
                continue;

            if (line_cache[0]) {
                /* We got some cache and a new line so we assume the cached
                 * line was actually part of the payload */
                av_bprintf(&buf, "%s\n", line_cache);
                line_cache[0] = 0;
            }

            /* If the line doesn't start with a number, we assume it's part of
             * the payload, otherwise is likely an event number preceding the
             * timing information... but we can't be sure of this yet, so we
             * cache it */
            if (strtol(line, &pline, 10) < 0 || line == pline)
                av_bprintf(&buf, "%s\n", line);
            else
                strcpy(line_cache, line);
        } else {
            if (has_event_info) {
                /* We have the information of previous event, append it to the
                 * queue. We insert the cached line if and only if the payload