Function ff_h2645_packet_split

libavcodec/h2645_parse.c:527–665

}

int ff_h2645_packet_split(H2645Packet *pkt, const uint8_t *buf, int length,
                          void *logctx, int nal_length_size,
                          enum AVCodecID codec_id, int flags)
{
    GetByteContext bc;
    int consumed, ret = 0;
    int next_avc = (flags & H2645_FLAG_IS_NALFF) ? 0 : length;
    int64_t padding = (flags & H2645_FLAG_SMALL_PADDING) ? 0 : MAX_MBPAIR_SIZE;

    bytestream2_init(&bc, buf, length);
    alloc_rbsp_buffer(&pkt->rbsp, length + padding, !!(flags & H2645_FLAG_USE_REF));

    if (!pkt->rbsp.rbsp_buffer)
        return AVERROR(ENOMEM);

    pkt->rbsp.rbsp_buffer_size = 0;
    pkt->nb_nals = 0;
    while (bytestream2_get_bytes_left(&bc) >= 4) {
        H2645NAL *nal;
        int extract_length = 0;
        int skip_trailing_zeros = 1;

        if (bytestream2_tell(&bc) == next_avc) {
            int i = 0;
            extract_length = get_nalsize(nal_length_size,
                                         bc.buffer, bytestream2_get_bytes_left(&bc), &i, logctx);
            if (extract_length < 0)
                return extract_length;

            bytestream2_skip(&bc, nal_length_size);

            next_avc = bytestream2_tell(&bc) + extract_length;
        } else {
            int buf_index;

            if (bytestream2_tell(&bc) > next_avc)
                av_log(logctx, AV_LOG_WARNING, "Exceeded next NALFF position, re-syncing.\n");

            /* search start code */
            buf_index = find_next_start_code(bc.buffer, buf + next_avc);

            bytestream2_skip(&bc, buf_index);

            if (!bytestream2_get_bytes_left(&bc)) {
                if (pkt->nb_nals > 0) {
                    // No more start codes: we discarded some irrelevant
                    // bytes at the end of the packet.
                    return 0;
                } else {
                    av_log(logctx, AV_LOG_ERROR, "No start code is found.\n");
                    return AVERROR_INVALIDDATA;
                }
            }

            extract_length = FFMIN(bytestream2_get_bytes_left(&bc), next_avc - bytestream2_tell(&bc));

            if (bytestream2_tell(&bc) >= next_avc) {
                /* skip to the start of the next NAL */