Why my video on the display is black and white? has anybody meet it ?

HI everyone:

                  I am WangJiang,I  want to   display  the  decoded   On the display,  But  The image is black and white, ,now the LCD'drive is right ,,The LCD is 800*480.  The code is below,If somebody  know ,please help me   ,Thakns very muck

while (!gblGetQuit()) {

        Pause_test(envp->hPauseProcess);

        Pause_test(envp->hPausePrime);

        fifoRet = Fifo_get(envp->hInFifo, &hSrcBuf);

 CapNum_Data = Buffer_getNumBytesUsed(hSrcBuf);
 printf("The Capplay data DisNum_Data = %d\n",CapNum_Data);

        if (fifoRet < 0) {
            ERR("Failed to get buffer from video thread\n");
            cleanup(THREAD_FAILURE);
        }

        if (fifoRet == Dmai_EFLUSH) {
            cleanup(THREAD_SUCCESS);
        }
        BufferGfx_getDimensions(hSrcBuf, &srcDim);

        if (Display_get(hDisplay, &hDstBuf) < 0) {
            ERR("Failed to get display buffer\n");
            cleanup(THREAD_FAILURE);
        }

        BufferGfx_getDimensions(hDstBuf, &dstDim);

       
        if (srcDim.width != clipWidth || srcDim.height != clipHeight) {
            clipWidth = srcDim.width;
            clipHeight = srcDim.height;

            gblSetImageWidth(srcDim.width);
            gblSetImageHeight(srcDim.height);

            if (srcDim.width > dstDim.width) {
                dstWidth   = dstDim.width;
                srcWidth   = dstDim.width;
                dstX       = 0;
            }
            else {
                dstWidth   = srcDim.width;
                srcWidth   = srcDim.width;
                dstX       = ((dstDim.width - srcDim.width) / 2) & ~0xf;
            }

            if (srcDim.height > dstDim.height) {
                dstHeight  = dstDim.height;
                srcHeight  = dstDim.height;
                dstY       = 0;
            }
            else {
                dstHeight  = srcDim.height;
                srcHeight  = srcDim.height;
                dstY       = (dstDim.height - srcDim.height) / 2;
            }

            dstDim.x       = dstX;
            dstDim.y       = dstY;
     /*dstDim.x       = -400;
            dstDim.y       = -1000;*/

            dstDim.width   = dstWidth;
            dstDim.height  = dstHeight;

            BufferGfx_setDimensions(hDstBuf, &dstDim);

            srcDim.width    = srcWidth;
            srcDim.height   = srcHeight;
             BufferGfx_setDimensions(hSrcBuf, &srcDim);

            if (Framecopy_config(hFc, hSrcBuf, hDstBuf) < 0) {
                ERR("Failed to configure frame copy job\n");
                cleanup(THREAD_FAILURE);
            }
        }

        srcDim.width    = srcWidth;
        srcDim.height   = srcHeight;
  printf("srcDim.width = %d\n",srcDim.width);
 printf("srcDim.height = %d\n",srcDim.height);
 printf("srcDim.x = %d\n",srcDim.x);
 printf("srcDim.y = %d\n",srcDim.y);
 printf("srcDim.lineLength = %d\n",srcDim.lineLength);
        BufferGfx_setDimensions(hSrcBuf, &srcDim);

        dstDim.width    = dstWidth;
        dstDim.height    = dstHeight;
         dstDim.x        = dstX;
        dstDim.y        = dstY;
 
 dstDim.lineLength    = 800;////////add by wangjian  height*width*3/2
 printf("dstDim.width = %d\n",dstDim.width);
 printf("dstDim.height = %d\n",dstDim.height);
 printf("dstDim.x = %d\n",dstDim.x);
 printf("dstDim.y = %d\n",dstDim.y);
 printf("dstDim.lineLength = %d\n",dstDim.lineLength);
        BufferGfx_setDimensions(hDstBuf, &dstDim);

        if (Framecopy_execute(hFc, hSrcBuf, hDstBuf) < 0) {
            ERR("Failed to execute frame copy job\n");
            cleanup(THREAD_FAILURE);
        }

        if(envp->videoStd == VideoStd_720P_60) {
            if (Time_delta(hTime, (UInt32*)&time) < 0) {
                ERR("Failed to get timer delta\n");
                cleanup(THREAD_FAILURE);
            }
            waitTime = DISPLAYLOOPLATENCY - time;
            if(waitTime > 0) {
                usleep(waitTime);
            }
            if(Time_reset(hTime) != Dmai_EOK) {
                ERR("Failed to reset timer\n");
                cleanup(THREAD_FAILURE);
            }
        }
       
        BufferGfx_resetDimensions(hSrcBuf);           

        if (Fifo_put(envp->hOutFifo, hSrcBuf) < 0) {
            ERR("Failed to send buffer to video thread\n");
            cleanup(THREAD_FAILURE);
        }
       
        gblIncFrames();          
       
        BufferGfx_resetDimensions(hDstBuf);

 DisNum_Data = Buffer_getNumBytesUsed(hDstBuf);
 printf("The Display data DisNum_Data = %d\n",DisNum_Data);

        if (Display_put(hDisplay, hDstBuf) < 0) {
            ERR("Failed to put display buffer\n");
            cleanup(THREAD_FAILURE);
        }
       
        frameCnt++;
    }