Function av_frame_side_data_clone

libavutil/side_data.c:248–304

}

int av_frame_side_data_clone(AVFrameSideData ***sd, int *nb_sd,
                             const AVFrameSideData *src, unsigned int flags)
{
    const AVSideDataDescriptor *desc;
    AVBufferRef     *buf    = NULL;
    AVFrameSideData *sd_dst = NULL;
    int              ret    = AVERROR_BUG;

    if (!sd || !src || !nb_sd || (*nb_sd && !*sd))
        return AVERROR(EINVAL);

    desc = av_frame_side_data_desc(src->type);
    if (flags & AV_FRAME_SIDE_DATA_FLAG_UNIQUE)
        av_frame_side_data_remove(sd, nb_sd, src->type);
    if ((!desc || !(desc->props & AV_SIDE_DATA_PROP_MULTI)) &&
        (sd_dst = (AVFrameSideData *)av_frame_side_data_get(*sd, *nb_sd, src->type))) {
        AVDictionary *dict = NULL;

        if (!(flags & AV_FRAME_SIDE_DATA_FLAG_REPLACE))
            return AVERROR(EEXIST);

        ret = av_dict_copy(&dict, src->metadata, 0);
        if (ret < 0)
            return ret;

        ret = av_buffer_replace(&sd_dst->buf, src->buf);
        if (ret < 0) {
            av_dict_free(&dict);
            return ret;
        }

        av_dict_free(&sd_dst->metadata);
        sd_dst->metadata = dict;
        sd_dst->data     = src->data;
        sd_dst->size     = src->size;
        return 0;
    }

    buf = av_buffer_ref(src->buf);
    if (!buf)
        return AVERROR(ENOMEM);

    sd_dst = add_side_data_from_buf_ext(sd, nb_sd, src->type, buf,
                                        src->data, src->size);
    if (!sd_dst) {
        av_buffer_unref(&buf);
        return AVERROR(ENOMEM);
    }

    ret = av_dict_copy(&sd_dst->metadata, src->metadata, 0);
    if (ret < 0) {
        remove_side_data_by_entry(sd, nb_sd, sd_dst);
        return ret;
    }

    return 0;
}