Cannot save a wav file after SampleGrabber grabs the audio sample?

[luckiejacky]

DexterLib::_AMMediaType mt;
	ZeroMemory(&mt, sizeof(AM_MEDIA_TYPE));
	//mt.majortype = MEDIATYPE_Video;
	//mt.subtype = MEDIASUBTYPE_RGB24;
	mt.majortype = MEDIATYPE_Audio;
	mt.formattype = FORMAT_WaveFormatEx;
	mt.subtype = MEDIASUBTYPE_PCM;
	mt.bTemporalCompression = FALSE;

	WAVEFORMATEXTENSIBLE *pwfx = 
			(WAVEFORMATEXTENSIBLE *) new BYTE[sizeof(WAVEFORMATEXTENSIBLE)];

	pwfx->Format.wFormatTag = WAVE_FORMAT_EXTENSIBLE;
	pwfx->Format.cbSize = sizeof(WAVEFORMATEXTENSIBLE) - sizeof(WAVEFORMATEX);
	pwfx->Format.nChannels = 2;
	pwfx->Format.nSamplesPerSec = 16000; // 16khz
	pwfx->Format.wBitsPerSample = 16;
	pwfx->Format.nAvgBytesPerSec = pwfx->Format.nSamplesPerSec * pwfx->Format.wBitsPerSample * pwfx->Format.nChannels / 8;
	pwfx->Format.nBlockAlign = pwfx->Format.wBitsPerSample * pwfx->Format.nChannels / 8;
	pwfx->dwChannelMask = (1 << pwfx->Format.nChannels) - 1;
	pwfx->Samples.wValidBitsPerSample = pwfx->Format.wBitsPerSample;
	pwfx->SubFormat = MEDIASUBTYPE_PCM;
	//pMediaType->SetFormat((BYTE*)pwfx, sizeof(WAVEFORMATEXTENSIBLE));
	mt.pbFormat = (BYTE*)pwfx;
	mt.cbFormat = sizeof(WAVEFORMATEXTENSIBLE);
	mt.lSampleSize = 2;

if ((mt.formattype == FORMAT_WaveFormatEx))
        //(mt.cbFormat >= sizeof(VIDEOINFOHEADER)) &&
        //(mt.pbFormat != NULL)) 
    {
         
		WAVEFORMATEX* pWav = (WAVEFORMATEX*)mt.pbFormat;
		size_t hdr_size = sizeof(WAVEFORMATEX);
		WriteWav(L"123.wav", pWav, hdr_size, pBuffer, cbBuffer);
		 
    }

I've specified the type, subtype and format. When the sample comes out, it is about 80k bytes in length, can't play back when saved.
Thanks
Jack

[A_Singh]

You can use this:

STDMETHODIMP CMpeg2Wav::Mpeg2WavConvertor(LPCWSTR file, HWND g_hwnd, LPCWSTR waveFile)
{
    if(g_hwnd == NULL)
    {
        MessageBox(NULL, "FAILED TO CREATE THE HANDLE" 
                   " OF THE WINDOW", NULL, NULL);
        exit(0);
    }
    //creating capture graph
    hr = CoCreateInstance(CLSID_CaptureGraphBuilder2, NULL, 
         CLSCTX_INPROC,  IID_ICaptureGraphBuilder2, (void **)&m_pCapture);
    if(FAILED(hr))
    {
        MessageBox(NULL, "Unable to create capture graph", NULL, NULL);
    }
    //creating graph builder
    hr = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, 
         IID_IGraphBuilder, (void **)&pGraphBuilder);
    if(FAILED(hr))
    {
        MessageBox(NULL, "Failed to Create Graph Builder", NULL, NULL);
    }
 
    hr = m_pCapture->SetFiltergraph(pGraphBuilder);  
    if(FAILED(hr))
    {
        MessageBox(NULL, "Failed", NULL, NULL);
    }
    pGraphBuilder->QueryInterface(IID_IMediaControl, (void **)&pMC);
    pGraphBuilder->QueryInterface(IID_IMediaEventEx, (void **)&pEvent);
    hr = CoCreateInstance(CLSID_MPEG1Splitter, NULL, CLSCTX_INPROC,
                          IID_IBaseFilter, (void**)&pSplitter);
    if(FAILED(hr))
    {
        MessageBox(NULL, "Failed to Create MpegSplitter Filter", NULL, NULL);
    }
    //creating Audio Decoder
    static const GUID CLSID_MPEG_Audio_Decoder = 
        { 0x4a2286e0, 0x7bef, 0x11ce, 
        { 0x9b, 0xd9, 0x0, 0x0, 0xe2, 0x02, 0x59, 0x9c } };
    hr = CoCreateInstance(CLSID_MPEG_Audio_Decoder, NULL, 
         CLSCTX_INPROC, IID_IBaseFilter, (void**)&pDecoder);
    if(FAILED(hr))
    {
        MessageBox(NULL, "Failed to Create MpegAudioDecoder Filter", 
                   NULL, NULL);
    }
    //creating Video Decoder
    static const GUID CLSID_MPEG_Video_Decoder = 
        {0xfeb50740 , 0x7bef, 0x11ce, 
        {0x9b , 0xd9, 0x0, 0x0, 0xe2, 0x2, 0x59,  0x9c} };
    hr = CoCreateInstance(CLSID_MPEG_Video_Decoder, 
         NULL, CLSCTX_INPROC, IID_IBaseFilter, (void**)&pVideoDecoder);
    if(FAILED(hr))
    {
        MessageBox(NULL, "Failed to Create MpegVideoDecoder Filter", NULL, NULL);
    }
    //creating Video Renderer for windows XP
    static const GUID CLSID_MPEG_Video_Renderer = 
        {0x6BC1CFFA , 0x8FC1, 0x4261, 
        { 0xAC, 0x22,0xCF , 0xB4, 0xCC, 0x38, 0xDB,  0x50} };
    hr = CoCreateInstance(CLSID_MPEG_Video_Renderer, NULL, 
         CLSCTX_INPROC, IID_IBaseFilter, (void**)&pVideoRenderer);
    if(FAILED(hr))
    {
        //creating Video Renderer for windows 2000
        static const GUID CLSID_Video_Renderer = 
               {0x70E102B0 , 0x5556, 0x11CE, 
               { 0x97, 0xC0, 0x00 , 0xAA, 0x00, 0x55, 0x59,  0x5A} };
        hr = CoCreateInstance(CLSID_Video_Renderer, NULL, 
             CLSCTX_INPROC, IID_IBaseFilter, (void**)&pVideoRenderer);

        if (FAILED(hr))
        {
            MessageBox(NULL, "Still Error!", "Error", MB_OK);
        }
     }

    //creating wavedest filter
    static const GUID CLSID_WavDest = 
           { 0x3c78b8e2, 0x6c4d, 0x11d1, 
           { 0xad, 0xe2, 0x0, 0x0, 0xf8, 0x75, 0x4b, 0x99 } };
    hr = CoCreateInstance(CLSID_WavDest, NULL, 
         CLSCTX_INPROC,  IID_IBaseFilter, (void **)&pWavDest);
    if(FAILED(hr))
    {
        MessageBox(NULL, "Failed to Create WaveDest Filter", NULL, NULL);
    }
    //Creating FileSink2
    hr = CoCreateInstance(CLSID_FileWriter, NULL, CLSCTX_INPROC,
                          IID_IFileSinkFilter2, (void **)&pFileSink);
    if(FAILED(hr))
    {
        MessageBox(NULL, "Failed to Create FileSink2 Filter", NULL, NULL);
    }
    // Get the file sink interface pointer from the File Writer
    hr = pFileSink->QueryInterface(IID_IBaseFilter, (void **)&pFileWriter);
    if(FAILED(hr))
    {
       MessageBox(NULL, "Unable to get the File Writer" 
                  " interface pointer from the File Sink", NULL, NULL);
    }
    hr = pFileSink->SetFileName(waveFile, NULL);
    if(FAILED(hr))
    {
        MessageBox(NULL, "Couldnt create wav file", NULL, NULL);
    }
    //adding writer to the graph
    hr = pGraphBuilder->AddFilter((IBaseFilter *)pFileWriter, L"File Writer");
    if(FAILED(hr))
    {
        MessageBox(NULL, "Failed to add Writer To Graph", NULL, NULL);
    }
    //adding wavdest to the graph
    hr = pGraphBuilder->AddFilter(pWavDest, L"WAV DEST");
    if(FAILED(hr))
    {
        MessageBox(NULL, "Failed to add WavDest To Graph", NULL, NULL);
    }
    //adding audioDecoder to the graph
    hr = pGraphBuilder->AddFilter(pDecoder, NULL);
    if(FAILED(hr))
    {
        MessageBox(NULL, "Failed to add audio decoder To Graph", NULL, NULL);
    }
    //adding video renderer to the graph
    hr = pGraphBuilder->AddFilter(pVideoRenderer, NULL);
    if(FAILED(hr))
    {
        MessageBox(NULL, "Failed to add video renderer To Graph", NULL, NULL);
    }
    //adding video Decoder to the graph
    hr = pGraphBuilder->AddFilter(pVideoDecoder, NULL);
    if(FAILED(hr))
    {
        MessageBox(NULL, "Failed to add video decoder To Graph", NULL, NULL);
    }
    //adding Mpeg Stream Splitter to the graph
    hr = pGraphBuilder->AddFilter(pSplitter, NULL);
    if(FAILED(hr))
    {
        MessageBox(NULL, "Failed to add MpegSplitter to graph", NULL, NULL);
    }
    hr = pFileSink->SetMode(AM_FILE_OVERWRITE);
    if(FAILED(hr))
    {
        MessageBox(NULL, "Failed to OverWrite", NULL, NULL);
    }
    hr = pGraphBuilder->RenderFile(file, NULL);
    if(FAILED(hr))
    {
        MessageBox(NULL, "Failed to RenderFile", NULL, NULL);
    }
    //Removing Video Renderer From the Graph
    hr = pGraphBuilder->RemoveFilter(pVideoRenderer);
    if(FAILED(hr))
    {
        MessageBox(NULL, "Couldn't remove the video" 
                         " rendere filter", NULL, NULL);
    }
    //Removing Video Decoder From the Graph
    hr = pGraphBuilder->RemoveFilter(pVideoDecoder);

    if(FAILED(hr))
    {
        MessageBox(NULL, "Couldn't remove the video decoder filter", NULL, NULL);
    }
    //Instructing the graph manager to send a windows message 
    //to the window of the calling application 
    //whenever an event occurs on the graph
    pEvent->SetNotifyWindow((OAHWND)g_hwnd, WM_GRAPHNOTIFY, 0);
    // Execute the graph
    hr = pMC->Run();
    if(FAILED(hr))
    {
        MessageBox(NULL, "Failed to Run", NULL, NULL);
    }
    return S_OK;
}

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