Function av_frame_replace

libavutil/frame.c:376–481

}

int av_frame_replace(AVFrame *dst, const AVFrame *src)
{
    int ret = 0;

    if (dst == src)
        return AVERROR(EINVAL);

    if (!src->buf[0]) {
        av_frame_unref(dst);

        /* duplicate the frame data if it's not refcounted */
        if (   src->data[0] || src->data[1]
            || src->data[2] || src->data[3])
            return av_frame_ref(dst, src);

        ret = frame_copy_props(dst, src, 0);
        if (ret < 0)
            goto fail;
    }

    dst->format         = src->format;
    dst->width          = src->width;
    dst->height         = src->height;
    dst->nb_samples     = src->nb_samples;

    ret = av_channel_layout_copy(&dst->ch_layout, &src->ch_layout);
    if (ret < 0)
        goto fail;

    av_frame_side_data_free(&dst->side_data, &dst->nb_side_data);
    av_dict_free(&dst->metadata);
    ret = frame_copy_props(dst, src, 0);
    if (ret < 0)
        goto fail;

    /* replace the buffers */
    for (int i = 0; i < FF_ARRAY_ELEMS(src->buf); i++) {
        ret = av_buffer_replace(&dst->buf[i], src->buf[i]);
        if (ret < 0)
            goto fail;
    }

    if (src->extended_buf) {
        if (dst->nb_extended_buf != src->nb_extended_buf) {
            int nb_extended_buf = FFMIN(dst->nb_extended_buf, src->nb_extended_buf);
            void *tmp;

            for (int i = nb_extended_buf; i < dst->nb_extended_buf; i++)
                av_buffer_unref(&dst->extended_buf[i]);

            tmp = av_realloc_array(dst->extended_buf, src->nb_extended_buf,
                                   sizeof(*dst->extended_buf));
            if (!tmp) {
                ret = AVERROR(ENOMEM);
                goto fail;
            }
            dst->extended_buf = tmp;
            dst->nb_extended_buf = src->nb_extended_buf;