Function ff_alloc_timecode_sei

libavcodec/utils.c:982–1029

}

int ff_alloc_timecode_sei(const AVFrame *frame, AVRational rate, size_t prefix_len,
                     void **data, size_t *sei_size)
{
    AVFrameSideData *sd = NULL;
    uint8_t *sei_data;
    PutBitContext pb;
    uint32_t *tc;
    int m;

    if (frame)
        sd = av_frame_get_side_data(frame, AV_FRAME_DATA_S12M_TIMECODE);

    if (!sd) {
        *data = NULL;
        return 0;
    }
    tc =  (uint32_t*)sd->data;
    m  = tc[0] & 3;

    *sei_size = sizeof(uint32_t) * 4;
    *data = av_mallocz(*sei_size + prefix_len);
    if (!*data)
        return AVERROR(ENOMEM);
    sei_data = (uint8_t*)*data + prefix_len;

    init_put_bits(&pb, sei_data, *sei_size);
    put_bits(&pb, 2, m); // num_clock_ts

    for (int j = 1; j <= m; j++) {
        unsigned hh, mm, ss, ff, drop;
        ff_timecode_set_smpte(&drop, &hh, &mm, &ss, &ff, rate, tc[j], 0, 0);

        put_bits(&pb, 1, 1); // clock_timestamp_flag
        put_bits(&pb, 1, 1); // units_field_based_flag
        put_bits(&pb, 5, 0); // counting_type
        put_bits(&pb, 1, 1); // full_timestamp_flag
        put_bits(&pb, 1, 0); // discontinuity_flag
        put_bits(&pb, 1, drop);
        put_bits(&pb, 9, ff);
        put_bits(&pb, 6, ss);
        put_bits(&pb, 6, mm);
        put_bits(&pb, 5, hh);
        put_bits(&pb, 5, 0);
    }
    flush_put_bits(&pb);

    return 0;
}

int64_t ff_guess_coded_bitrate(AVCodecContext *avctx)
{