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Retrieving DirectX VA Devices

Last Updated: 2/14/2017

Use the following example code to retrieve DirectX VA devices. This code is an implementation of the DdMoCompGetGuids callback function. The GetMoCompGuids member of the DD_MOTIONCOMPCALLBACKS structure points to the callback function.

DWORD g_dwDXVANumSupportedGUIDs = 4;
const GUID* g_DXVASupportedGUIDs[4] = {
 &DXVA_DeinterlaceContainerDevice,
    &DXVA_ProcAmpControlDevice
    &DXVA_DeinterlaceBobDevice
 &DXVA_COPPDevice
};

DWORD APIENTRY
  MOCOMPCB_GETGUIDS(
    PDD_GETMOCOMPGUIDSDATA  lpData
    )
{
    DWORD dwNumToCopy;

    // If lpGuids == NULL, the driver must return the number of 
    // supported GUIDS in the dwNumGuids parameter. If non-NULL, 
    // the supported GUIDS must be copied into the buffer at lpGuids.
    if (lpData->lpGuids) {
        dwNumToCopy = min(g_dwDXVANumSupportedGUIDs, lpData->dwNumGuids);
        for (DWORD i = 0; i < dwNumToCopy; i++) {
            lpData->lpGuids[i] = *g_DXVASupportedGUIDs[i];
        }
    }
    else {
        dwNumToCopy = g_dwDXVANumSupportedGUIDs;
    }

    lpData->dwNumGuids = dwNumToCopy;
    lpData->ddRVal = DD_OK;

    return DDHAL_DRIVER_HANDLED;
}

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