Function dv_read_timecode

libavformat/dv.c:546–574

} RawDVContext;

static int dv_read_timecode(AVFormatContext *s) {
    int ret;
    char timecode[AV_TIMECODE_STR_SIZE];
    int64_t pos = avio_tell(s->pb);

    // Read 3 DIF blocks: Header block and 2 Subcode blocks.
#define PARTIAL_FRAME_SIZE (3 * 80)
    uint8_t partial_frame[PARTIAL_FRAME_SIZE];
    RawDVContext *c = s->priv_data;

    ret = avio_read(s->pb, partial_frame, PARTIAL_FRAME_SIZE);
    if (ret < 0)
        goto finish;

    if (ret < PARTIAL_FRAME_SIZE) {
        ret = -1;
        goto finish;
    }

    ret = dv_extract_timecode(&c->dv_demux, partial_frame, timecode);
    if (ret)
        av_dict_set(&s->metadata, "timecode", timecode, 0);
    else
        av_log(s, AV_LOG_ERROR, "Detected timecode is invalid\n");

finish:
    avio_seek(s->pb, pos, SEEK_SET);
    return ret;
}

static int dv_read_header(AVFormatContext *s)
{