Wie IMFSample Objekt zu duplizieren

Question

Ich muss IMFSample Objekt duplizieren, so dass ich getrennte unabhängige Objekte haben werde. Microsoft-API bietet keine einfache Möglichkeit zum Duplizieren IMFSample Video Frame.

Answer 1

Hier ist ein Beispielcode:

#define MmfThrowIfError(hrVal) \ 
{ \ 
    HRESULT hrMmfTraceInternal = (hrVal); \ 
    if (FAILED(hrMmfTraceInternal)) \ 
    { \ 
     /* LOG_F(LS_ERROR)<<"MMF hr: 0x"<<std::hex<<hrMmfTraceInternal; */ \ 
     throw ref new ::Platform::Exception(hrMmfTraceInternal); \ 
    } \ 
} 

MFComPtr<IMFMediaBuffer> DuplicateBuffer(const MFComPtr<IMFMediaBuffer>& srcBuf) 
{ 
    byte* srcByteBuffer = nullptr; 
    DWORD srcBuffMaxLen = 0; 
    DWORD srcBuffCurrLen = 0; 
    MmfThrowIfError(srcBuf->Lock(&srcByteBuffer, &srcBuffMaxLen, &srcBuffCurrLen)); 

    MFComPtr<IMFMediaBuffer> destBuf = nullptr; 
    MmfThrowIfError(MFCreateMemoryBuffer(srcBuffCurrLen, &destBuf)); 

    byte* destByteBuffer = nullptr; 
    MmfThrowIfError(destBuf->Lock(&destByteBuffer, nullptr, nullptr)); 
    memcpy(destByteBuffer, srcByteBuffer, srcBuffCurrLen); 
    MmfThrowIfError(destBuf->Unlock()); 
    MmfThrowIfError(srcBuf->Unlock()); 

    MmfThrowIfError(destBuf->SetCurrentLength(srcBuffCurrLen)); 
    return destBuf; 
} 

SampleComPtr DuplicateSample(const SampleComPtr& sample) 
{ 
    if (!sample) 
     return nullptr; 

    DWORD sampleFlags = 0; 
    LONGLONG llVideoTimeStamp = 0; 
    LONGLONG llSampleDuration = 0; 
    MmfThrowIfError(sample->GetSampleFlags(&sampleFlags)); 
    MmfThrowIfError(sample->GetSampleTime(&llVideoTimeStamp)); 
    MmfThrowIfError(sample->GetSampleDuration(&llSampleDuration)); 

    SampleComPtr outSample; 
    MFCreateSample(&outSample); 
    MmfThrowIfError(outSample->SetSampleFlags(sampleFlags)); 
    MmfThrowIfError(outSample->SetSampleTime(llVideoTimeStamp)); 
    MmfThrowIfError(outSample->SetSampleDuration(llSampleDuration)); 

    DWORD bufferCount = 0; 
    MmfThrowIfError(sample->GetBufferCount(&bufferCount)); 

    for (DWORD index = 0; index < bufferCount; ++index) 
    { 
     MFComPtr<IMFMediaBuffer> srcBuf = nullptr; 
     MmfThrowIfError(sample->GetBufferByIndex(index, &srcBuf)); 

     MFComPtr<IMFMediaBuffer> reConstructedBuffer = DuplicateBuffer(srcBuf); 
     srcBuf = nullptr; 
     MmfThrowIfError(outSample->AddBuffer(reConstructedBuffer.Get())); 
    } 

    return outSample; 
}