问用于颜色空间转换的IMTransform视频处理器的设置

EN

class Media : public IMFSourceReaderCallback //this class inhertis from IMFSourceReaderCallback
{
    CRITICAL_SECTION criticalSection;
    long referenceCount;
    WCHAR                   *wSymbolicLink;
    UINT32                  cchSymbolicLink;
    IMFSourceReader* sourceReader;
    MFT_REGISTER_TYPE_INFO *inputVideoTypes;
    MFT_REGISTER_TYPE_INFO *outputVideoTypes;
    IMFMediaType* mediaType = NULL;
    IMFMediaType* streamType = NULL;
    IMFMediaType* streamType2 = NULL;
    IMFMediaType* streamType3 = NULL;
    IMFTransform **VP;

public:
    LONG stride;
    float bytesPerPixel;
    GUID videoFormat;
    UINT height;
    UINT width;
    WCHAR deviceNameString[2048];
    BYTE* rawData;
    UINT32 count;
    DWORD devices_found = 0;
    HRESULT CreateCaptureDevice();
    HRESULT SetSourceReader(IMFActivate *device);
    HRESULT IsMediaTypeSupported(IMFMediaType* type);
    HRESULT GetDefaultStride(IMFMediaType *pType, LONG *plStride);
    HRESULT Close();
    Media();
    ~Media();   

    // the class must implement the methods from IUnknown 
    STDMETHODIMP QueryInterface(REFIID iid, void** ppv);
    STDMETHODIMP_(ULONG) AddRef();
    STDMETHODIMP_(ULONG) Release();

    //  the class must implement the methods from IMFSourceReaderCallback 
    STDMETHODIMP OnReadSample(HRESULT status, DWORD streamIndex, DWORD streamFlags, LONGLONG timeStamp, IMFSample *sample);
    STDMETHODIMP OnEvent(DWORD, IMFMediaEvent *);
    STDMETHODIMP OnFlush(DWORD);

};

inputVideoTypes = new MFT_REGISTER_TYPE_INFO;
inputVideoTypes->guidMajorType = MFMediaType_Video;
inputVideoTypes->guidSubtype = MFVideoFormat_NV12;
outputVideoTypes = new MFT_REGISTER_TYPE_INFO;
outputVideoTypes->guidMajorType = MFMediaType_Video;
outputVideoTypes->guidSubtype = MFVideoFormat_RGB24;
hr = sourceReader->GetNativeMediaType(MF_SOURCE_READER_FIRST_VIDEO_STREAM, i, &streamType2);
IMFActivate **transformActivateArray = NULL;
UINT32 MFTcount;
hr = MFTEnumEx(MFT_CATEGORY_VIDEO_PROCESSOR, MFT_ENUM_FLAG_ALL, inputVideoTypes, outputVideoTypes, &transformActivateArray, &MFTcount);
if (FAILED(hr))
{
    exit(3);
}
if (MFTcount == 0)
exit(7);
VP = new IMFTransform*[MFTcount];
for (DWORD i = 0; i < MFTcount; i++)
{
    hr = transformActivateArray[i]->ActivateObject(__uuidof(IMFTransform), (void**)&VP[i]);
}
DWORD* inputCount = new DWORD[MFTcount];
DWORD* outputCount = new DWORD[MFTcount];
for (DWORD i = 0; i < MFTcount; i++)
{
    hr = VP[i]->GetStreamCount(&inputCount[i], &outputCount[i]);
}
DWORD **inputids = new DWORD*[MFTcount];
DWORD **outputids = new DWORD*[MFTcount];
for (DWORD i = 0; i < MFTcount; i++)
{
        inputids[i] = new DWORD[inputCount[i]];
        outputids[i] = new DWORD[outputCount[i]];
}
for (DWORD i = 0; i < MFTcount; i++)
{
    VP[i]->GetStreamIDs(inputCount[i], inputids[i], outputCount[i], outputids[i]);
    if (FAILED(hr))
    exit(5);
}
DWORD flag1 = -1;
DWORD flag2 = -1;
for (DWORD i = 0; i < MFTcount; i++)
{
    for (DWORD j = 0; j < inputCount[i]; j++)
    {
        hr = VP[i]->GetInputAvailableType(0, 0, &streamType);
        if (SUCCEEDED(hr))
        {
            flag1 = i;
            flag2 = j;
            break;
        }
    }
}
if (flag1 == -1 && flag2 == -1)
exit(2);
hr = VP[0]->SetInputType(0, streamType2, 0);
hr = VP[0]->GetOutputAvailableType(0, 0, &streamType3);
hr = VP[0]->SetOutputType(0, streamType3, 0);

MF_MT_FRAME_SIZE    1280 x 720
MF_MT_YUV_MATRIX    2
MF_MT_MAJOR_TYPE    MFMediaType_Video
MF_MT_VIDEO_LIGHTING    3
MF_MT_VIDEO_CHROMA_SITING   1
MF_MT_AM_FORMAT_TYPE    {F72A76A0-EB0A-11D0-ACE4-0000C0CC16BA}
MF_MT_FIXED_SIZE_SAMPLES    1
MF_MT_VIDEO_NOMINAL_RANGE   1
MF_MT_FRAME_RATE    30 x 1
MF_MT_PIXEL_ASPECT_RATIO    1 x 1
MF_MT_ALL_SAMPLES_INDEPENDENT   1
MF_MT_FRAME_RATE_RANGE_MIN  128849018881
MF_MT_VIDEO_PRIMARIES   2
MF_MT_INTERLACE_MODE    2
MF_MT_FRAME_RATE_RANGE_MAX  128849018881
{EA031A62-8BBB-43C5-B5C4-572D2D231C18}  1
MF_MT_SUBTYPE   MFVideoFormat_NV12

Exception thrown: read access violation.
**pType** was nullptr.

hr = VP->SetInputType(0, streamType2, 0);
//MediaFoundationSamples::LogMediaType(streamType2);
DWORD dwIndex = 4;
hr = VP->GetOutputAvailableType(0, dwIndex, &streamType3);
hr = MFSetAttributeSize(streamType3, MF_MT_FRAME_SIZE, 1280, 720);
hr = streamType3->SetUINT32(MF_MT_FIXED_SIZE_SAMPLES, 1);
hr = MFSetAttributeRatio(streamType3, MF_MT_FRAME_RATE, 30, 1);
hr = MFSetAttributeRatio(streamType3, MF_MT_PIXEL_ASPECT_RATIO, 1, 1);
streamType3->SetUINT32(MF_MT_ALL_SAMPLES_INDEPENDENT, 1);
streamType3->SetUINT32(MF_MT_INTERLACE_MODE, 2);
MediaFoundationSamples::LogMediaType(streamType3);
hr = VP->SetOutputType(0, streamType3, 0);
hr = VP->GetInputStreamInfo(0, &InputInfo);
hr = VP->GetOutputStreamInfo(0, &OutputInfo);

hr = VP->ProcessMessage(MFT_MESSAGE_NOTIFY_BEGIN_STREAMING, NULL);
hr = VP->ProcessInput(0, sample, 0);
DWORD statusFlags;
hr = VP->GetOutputStatus(&statusFlags);
while (statusFlags == 0)
{
    hr = VP->ProcessInput(0, sample, 0);
    hr = VP->GetOutputStatus(&statusFlags);
}
DWORD outputStatus = 0;
IMFSample* outputSample;
MFCreateSample(&outputSample);
MFT_OUTPUT_DATA_BUFFER outputBuffer = {};
outputBuffer.pSample = outputSample;
hr = VP->ProcessOutput(0, OutputInfo.cbSize, &outputBuffer, &outputStatus);