int av_packet_add_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
                            uint8_t *data, size_t size)
{
    AVPacketSideData *tmp;
    int elems = pkt->side_data_elems;

    if ((unsigned)elems + 1 > INT_MAX / sizeof(*pkt->side_data))
        return AVERROR(ERANGE);

    tmp = av_realloc(pkt->side_data, (elems + 1) * sizeof(*tmp));
    if (!tmp)
        return AVERROR(ENOMEM);

    pkt->side_data = tmp;
    pkt->side_data[elems].data = data;
    pkt->side_data[elems].size = size;
    pkt->side_data[elems].type = type;
    pkt->side_data_elems++;

    return 0;
}