int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height)

{

    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);

    AVPicture dummy_pict;

    int ret;





    if ((ret = av_image_check_size(width, height, 0, NULL)) < 0)

        return ret;

    if (desc->flags & PIX_FMT_PSEUDOPAL)

        

        return width * height;

    return avpicture_fill(&dummy_pict, NULL, pix_fmt, width, height);

}