Method CreateOutputNode

core/media/WmfMediaEngine.cpp:1662–1761

//-------------------------------------------------------------------

HRESULT WmfMediaEngine::CreateOutputNode(IMFStreamDescriptor* pSourceSD, IMFTopologyNode** ppNode)
{

    TComPtr<IMFTopologyNode> OutputNode;
    TComPtr<IMFMediaTypeHandler> pHandler;
    TComPtr<IMFActivate> pRendererActivate;

    GUID guidMajorType = GUID_NULL;
    HRESULT hr         = S_OK;

    // Get the stream ID.
    DWORD streamID = 0;
    pSourceSD->GetStreamIdentifier(&streamID);  // Just for debugging, ignore any failures.

    // Get the media type handler for the stream.
    CHECK_HR(hr = pSourceSD->GetMediaTypeHandler(&pHandler));

    // Get the major media type.
    CHECK_HR(hr = pHandler->GetMajorType(&guidMajorType));

    // Create a downstream node.
    CHECK_HR(hr = MFCreateTopologyNode(MF_TOPOLOGY_OUTPUT_NODE, &OutputNode));

    // Create an IMFActivate object for the renderer, based on the media type.
    if (MFMediaType_Video == guidMajorType)
    {
        // Create the video renderer.
        AXME_TRACE("Stream {}: video stream\n", streamID);
        // CHECK_HR(hr = MFCreateVideoRendererActivate(hwndVideo, &pRendererActivate));
        auto Sampler                     = MFUtils::MakeComPtr<MFVideoSampler>(this);
        TComPtr<IMFMediaType>& InputType = m_videoInputType;
        CHECK_HR(hr = pHandler->GetCurrentMediaType(InputType.ReleaseAndGetAddressOf()));

        // Create output type
        GUID SubType;
        CHECK_HR(hr = InputType->GetGUID(MF_MT_SUBTYPE, &SubType));

        auto strType = MFUtils::GetVideoTypeName(SubType);
        AXME_TRACE("WmfMediaEngine: Input video type: {}", strType);

        m_bIsH264 = SubType == MFVideoFormat_H264 || SubType == MFVideoFormat_H264_ES;
        m_bIsHEVC = SubType == MFVideoFormat_HEVC || SubType == MFVideoFormat_HEVC_ES;

        GUID VideoOutputFormat;
        if ((SubType == MFVideoFormat_HEVC) || (SubType == MFVideoFormat_HEVC_ES) || (SubType == MFVideoFormat_NV12) ||
            (SubType == MFVideoFormat_IYUV))
        {
            VideoOutputFormat = MFVideoFormat_NV12;
        }
        else
        {
            const bool Uncompressed = (SubType == MFVideoFormat_RGB555) || (SubType == MFVideoFormat_RGB565) ||
                                      (SubType == MFVideoFormat_RGB24) || (SubType == MFVideoFormat_RGB32) ||
                                      (SubType == MFVideoFormat_ARGB32);

            VideoOutputFormat = Uncompressed ? MFVideoFormat_RGB32 : MFVideoFormat_YUY2;
        }