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Topic: Question about WM Encodor SDK (Read 2836 times) previous topic - next topic
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Question about WM Encodor SDK

I am new to the Windows Media Encoder SDK and I am facing a strange problem.
I have successfully called put_AutoStop() and yet the encoder doesn't seem
to stop. I am just encoding a small PCM WAVE file to a WMA. The following is
my code. Can someone help me out?


Code: [Select]
void main()
{
    HRESULT hr;
    IWMEncoder* pEncoder;
    IWMEncSourceGroupCollection* pSrcGrpColl;
    IWMEncSourceGroup* pSrcGrp;
    IWMEncSource* pSrcAud;
    IWMEncFile* pFile;

    // Initialize the COM library
    hr = CoInitialize(NULL);

    // Retrieve a pointer to an IWMEncoder interface
    if (SUCCEEDED(hr))
    {
        hr = CoCreateInstance(CLSID_WMEncoder,
            NULL,
            CLSCTX_INPROC_SERVER,
            IID_IWMEncoder,
            (void**) &pEncoder);
    }

    // Set up the input
    if (SUCCEEDED(hr))
        hr = pEncoder->get_SourceGroupCollection(&pSrcGrpColl);
    if (SUCCEEDED(hr))
        hr = pSrcGrpColl->Add(CComBSTR("SG_1"), &pSrcGrp);
    if (SUCCEEDED(hr))
        hr = pSrcGrp->AddSource(WMENC_AUDIO, &pSrcAud);
    if (SUCCEEDED(hr))
        hr = pSrcAud->SetInput(CComBSTR("c:\\test\\in.wav"));
    if (SUCCEEDED(hr))
        hr = pSrcGrp->put_Profile(CComVariant("c:\\test\\in.prx"));

    // Set up the output
    if (SUCCEEDED(hr))
        hr = pEncoder->get_File(&pFile);
    if (SUCCEEDED(hr))
        hr = pFile->put_LocalFileName(CComBSTR("c:\\test\\out.wma"));

    // Set auto-stop and start encoding
    if (SUCCEEDED(hr))
        hr = pEncoder->put_AutoStop(VARIANT_TRUE);
    if (SUCCEEDED(hr))
        hr = pEncoder->PrepareToEncode(VARIANT_TRUE);
    if (SUCCEEDED(hr))
        hr = pEncoder->Start();

    WMENC_ENCODER_STATE enumState = WMENC_ENCODER_RUNNING;

    // **  Infinite loop - the state never changes! **
    while (enumState == WMENC_ENCODER_RUNNING)
    {
        pEncoder->get_RunState(&enumState);
        printf("Current state %d.\n", enumState);
        Sleep(500);
    }

    // Stop the encoder manually
    pEncoder->Stop();

    // Release pointers.
    if (pSrcGrpColl)
    {
        pSrcGrpColl->Release();
        pSrcGrpColl = NULL;
    }
    if (pSrcGrp)
    {
        pSrcGrp->Release();
        pSrcGrp = NULL;
    }
    if (pFile)
    {
        pFile->Release();
        pFile = NULL;
    }
    if (pSrcAud)
    {
        pSrcAud->Release();
        pSrcAud = NULL;
    }
    if (pEncoder)
    {
        pEncoder->Release();
        pEncoder = NULL;
    }
}