how can I get 2592x1944 JPG by using DM355IPNC-MT5?

hi all

now i can get a jpg image from DM355IPNC,but its size is 640x352.

what i changed is here:

static int jpegVideoBuffer(IMGENC1_Handle hEncode, char *inBuf, int inSize,
                             char *outBuf, int *outBufSize, int *frametype, int width,
                             int height)
{
    XDM1_BufDesc            inBufDesc;
    XDM1_BufDesc            outBufDesc;
    Int32                      status;

    IMGENC1_InArgs          inArgs;
    IMGENC1_OutArgs         outArgs;

    inBufDesc.numBufs           = 1;
    inBufDesc.descs[0].bufSize     = inSize;
    inBufDesc.descs[0].buf         = inBuf;

    outBufDesc.numBufs          = 1;
    outBufDesc.descs[0].bufSize = D1_FRAME_SIZE;
    outBufDesc.descs[0].buf        = outBuf;

    inArgs.size                 = sizeof(IMGENC1_InArgs);
    outArgs.size                = sizeof(IMGENC1_OutArgs);

    /* perform the image (JPEG) encoding */
    status = IMGENC1_process(hEncode, &inBufDesc, &outBufDesc, &inArgs,
                            &outArgs);

    if (status != IMGENC1_EOK) {
        ERR("Encoder process returned fail!! \n");
        return FAILURE;
    }

    *outBufSize = outArgs.bytesGenerated;
    *frametype     = 1;
////////////////////////////////////////////////add here//////////////////////////////////////////////
    if(sig_usr2 == 1)
    {
        time_t zeit;
        char strzeit[256];
        struct tm *zeitinfo;
        setlocale(LC_ALL, "");
        time(&zeit);
        zeitinfo = localtime(&zeit);
        strftime(strzeit, 255, "%Y%m%d_%R:%S", zeitinfo);

        char dateiname[40];
        strcpy(dateiname,"usb");
        strcat(dateiname,strzeit);
        strcat(dateiname,".jpg");
        FILE *filestream = NULL;

        filestream = fopen(dateiname, "w");
        fwrite(outBuf, 1, outArgs.bytesGenerated, filestream);
        fclose(filestream);
        printf("Schreibe Datei: %s\n", dateiname);

    }
////////////////////////////////////////////////add end//////////////////////////////////////////////
    sig_usr2 = 0;
    return SUCCESS;
}

but i want get 2592x1944 or 1280x960 jpg image,what should i do?