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Performing COPP Operations

Last Updated: 2/14/2017

This section applies only to Windows Server 2003 SP1 and later, and Windows XP SP2 and later.

Use the following example code to perform operations over the Certified Output Protection Protocol (COPP). The example code implements the DdMoCompRender callback function. The RenderMoComp member of the DD_MOTIONCOMPCALLBACKS structure points to the callback function. The example code only shows how DdMoCompRender is used for COPP operations. For an implementation of DdMoCompRender that performs ProcAmp control and deinterlacing operations, see Performing ProcAmp Control and Deinterlacing Operations and Performing Deinterlacing with Substream Compositing Operations.

DWORD APIENTRY
  MOCOMPCB_RENDER(
    PDD_RENDERMOCOMPDATA  lpData
    )
{
    // The driver saves the device class object in lpDriverReserved1 
     // during the DdMoCompCreate callback. For more information, 
     // see Creating Instances of DirectX VA Device Objects.
  DXVA_DeviceBaseClass* pDXVABase =
         (DXVA_DeviceBaseClass*)lpData->lpMoComp->lpDriverReserved1;
 if (pDXVABase == NULL) {
        lpData->ddRVal = E_POINTER;
        return DDHAL_DRIVER_HANDLED;
    }
    // Process according to the device type in the class object.
     // For more information, see Defining DirectX VA Device Classes.
    switch (pDXVABase->m_DeviceType) {
    // This is the COPP device.
    case DXVA_DeviceCOPP:
        {
            DXVA_COPPDeviceClass* pDXVACopp =
                        (DXVA_COPPDeviceClass*)pDXVABase;
            ULONG BytesReturned;
            HANDLE handle = (HANDLE)GetDriverHandleFromPDEV(lpData->lpDD->lpGbl->dhpdev)
            COPP_IO_InputBuffer InputBuffer;
            InputBuffer.ppThis = &pDXVACopp->m_pThis;
            InputBuffer.phr = &lpData->ddRVal;
            switch (lpData->dwFunction) {
            case DXVA_COPPGetCertificateLengthFnCode:
                if (lpData->dwOutputDataSize < sizeof(ULONG)) {
 lpData->ddRVal = E_INVALIDARG;
                }
                else { 
 InputBuffer.InputBuffer = NULL;
                    EngDeviceIoControl(handle,
                                      IOCTL_COPP_GetCertificateLength,
                                      &InputBuffer,
                                      sizeof(InputBuffer),
                                      lpData->lpOutputData,
                                      lpData->dwOutputDataSize,
                                      &BytesReturned);
                }
                break;
            case DXVA_COPPKeyExchangeFnCode:
                if (lpData->dwOutputDataSize < sizeof(DXVA_COPPKeyExchangeOutput)) {
  lpData->ddRVal = E_INVALIDARG;
                }
                else {
 InputBuffer.InputBuffer = NULL;
                    DD_SURFACE_LOCAL* lpCompSurf =
                        lpData->lpBufferInfo[0].lpCompSurface;
                    InputBuffer.InputBuffer = (PVOID)lpCompSurf->lpGbl->fpVidMem;
                    EngDeviceIoControl(handle
                                       IOCTL_COPP_KeyExchange,
                                       &InputBuffer,
                                        sizeof(InputBuffer),
                                       lpData->lpOutputData,
                                       lpData->dwOutputDataSize,
                                       &BytesReturned);
                }
                break;
            case DXVA_COPPSequenceStartFnCode:
                if (lpData->dwInputDataSize < sizeof(DXVA_COPPSignature)) {
 lpData->ddRVal = E_INVALIDARG;
                }
                else {
                    InputBuffer.InputBuffer = lpData->lpInputData;
                    EngDeviceIoControl(handle,
 IOCTL_COPP_StartSequence,
                                       &InputBuffer,
                                       sizeof(InputBuffer),
                                       NULL,
                                       0,
                                       &BytesReturned);
                }
                break;
            case DXVA_COPPCommandFnCode:
                if (lpData->dwInputDataSize < sizeof(DXVA_COPPCommand)) {
 lpData->ddRVal = E_INVALIDARG;
                }
                else {
                    InputBuffer.InputBuffer = lpData->lpInputData;
                    EngDeviceIoControl(handle,
 IOCTL_COPP_Command,
                                       &InputBuffer,
                                       sizeof(InputBuffer),
                                       NULL,
                                       0,
                                       &BytesReturned);
                }
                break;
            case DXVA_COPPQueryStatusFnCode:
                if (lpData->dwInputDataSize < sizeof(DXVA_COPPStatusInput) ||
                    lpData->dwOutputDataSize < sizeof(DXVA_COPPStatusOutput)) {
 lpData->ddRVal = E_INVALIDARG;
                }
                else {
                    InputBuffer.InputBuffer = lpData->lpInputData;
                    EngDeviceIoControl(handle,
 IOCTL_COPP_Status,
                                       &InputBuffer,
                                       sizeof(InputBuffer),
                                       lpData->lpOutputData,
                                       lpData->dwOutputDataSize,
                                       &BytesReturned);
 }
                break;
            default:
                lpData->ddRVal = E_INVALIDARG;
 break;
            }
            break;
        }
    }
    return DDHAL_DRIVER_HANDLED;
}

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