int av_stream_add_side_data(AVStream *st, enum AVPacketSideDataType type,
                            uint8_t *data, size_t size)
{
    AVPacketSideData *sd, *tmp;
    int i;

    for (i = 0; i < st->nb_side_data; i++) {
        sd = &st->side_data[i];

        if (sd->type == type) {
            av_freep(&sd->data);
            sd->data = data;
            sd->size = size;
            return 0;
        }
    }

    if ((unsigned)st->nb_side_data + 1 >= INT_MAX / sizeof(*st->side_data))
        return AVERROR(ERANGE);

    tmp = av_realloc(st->side_data, st->nb_side_data + 1 * sizeof(*tmp));
    if (!tmp) {
        return AVERROR(ENOMEM);
    }

    st->side_data = tmp;
    st->nb_side_data++;

    sd = &st->side_data[st->nb_side_data - 1];
    sd->type = type;
    sd->data = data;
    sd->size = size;

    return 0;
}