static int dxtory_decode_v1_410(AVCodecContext *avctx, AVFrame *pic,

                                const uint8_t *src, int src_size)

{

    int h, w;

    uint8_t *Y1, *Y2, *Y3, *Y4, *U, *V;

    int ret;



    if (src_size < avctx->width * avctx->height * 9L / 8) {

        av_log(avctx, AV_LOG_ERROR, "packet too small\n");

        return AVERROR_INVALIDDATA;

    }



    avctx->pix_fmt = AV_PIX_FMT_YUV410P;

    if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)

        return ret;



    Y1 = pic->data[0];

    Y2 = pic->data[0] + pic->linesize[0];

    Y3 = pic->data[0] + pic->linesize[0] * 2;

    Y4 = pic->data[0] + pic->linesize[0] * 3;

    U  = pic->data[1];

    V  = pic->data[2];

    for (h = 0; h < avctx->height; h += 4) {

        for (w = 0; w < avctx->width; w += 4) {

            AV_COPY32(Y1 + w, src);

            AV_COPY32(Y2 + w, src + 4);

            AV_COPY32(Y3 + w, src + 8);

            AV_COPY32(Y4 + w, src + 12);

            U[w >> 2] = src[16] + 0x80;

            V[w >> 2] = src[17] + 0x80;

            src += 18;

        }

        Y1 += pic->linesize[0] << 2;

        Y2 += pic->linesize[0] << 2;

        Y3 += pic->linesize[0] << 2;

        Y4 += pic->linesize[0] << 2;

        U  += pic->linesize[1];

        V  += pic->linesize[2];

    }



    return 0;

}
