如何從directshow濾波器輸出引腳獲取數據？

Question

我有直接顯示過濾器，它接受輸入並對其進行處理並將結果提供給輸出引腳。

我想寫這個過濾器輸出數據到一個文件...我想在它的過濾器class.So我想獲得輸出引腳緩衝區數據。

很快如何達到其濾波器輸出引腳的最終數據？我該怎麼做？

不：輸出引腳從CBaseOutputPin.This導出是一個開源的過濾它「神奇」 :-)把賴特數據到其輸出引腳，我無法弄清楚如何尚未...

更新：

這裏是siutuation：GFilter的

Media Source ----> GFilter ----> FileWriter 

我的源代碼...我的FileWriter沒有源代碼......我想什麼做的是使GFilter編寫它自己的數據...我調試GFilter得到一些洞察如何其轉換數據，但我試圖寫這個數據結果與錯誤的數據...所以我現在欺騙如何簡單地在其輸出引腳獲取數據...

更新[2]

在篩選outputpin somwhere濾波器作家通過文件寫入器銷IStreamPtr可變...寄託都似乎寫入到可變m_pIStream其是[IStreamPtr]

GFilterOutput::CompleteConnect(IPin *pReceivePin) 
{ 


    // make sure that this is the file writer, supporting 
    // IStream, or we will not be able to write out the metadata 
    // at stop time 
    // m_pIStream is IStreamPtr type 
    m_pIStream = pReceivePin; 
    if (m_pIStream == NULL) 
    { 
     return E_NOINTERFACE; 
    } 
    return CBaseOutputPin::CompleteConnect(pReceivePin); 
} 

類型

...

GFilterOutput::Replace(LONGLONG pos, const BYTE* pBuffer, long cBytes) 
{ 
    //OutputDebugStringA("DEBUG: Now at MuxOutput Replace"); 

    // all media content is written when the graph is running, 
    // using IMemInputPin. On stop (during our stop, but after the 
    // file writer has stopped), we switch to IStream for the metadata. 
    // The in-memory index is updated after a successful call to this function, so 
    // any data not written on completion of Stop will not be in the index. 
    CAutoLock lock(&m_csWrite); 

    HRESULT hr = S_OK; 
    if (m_bUseIStream) 
    { 


     IStreamPtr pStream = GetConnected(); 
     if (m_pIStream == NULL) 
     { 
      hr = E_NOINTERFACE; 
     } else { 
      LARGE_INTEGER liTo; 
      liTo.QuadPart = pos; 
      ULARGE_INTEGER uliUnused; 
      hr = m_pIStream->Seek(liTo, STREAM_SEEK_SET, &uliUnused); 
      if (SUCCEEDED(hr)) 
      { 
       ULONG cActual; 
       hr = m_pIStream->Write(pBuffer, cBytes, &cActual); 
       if (SUCCEEDED(hr) && ((long)cActual != cBytes)) 
       { 
        hr = E_FAIL; 
       } 
      } 
     } 
    } else { 
     // where the buffer boundaries lie is not important in this 
     // case, so break writes up into the buffers. 
     while (cBytes && (hr == S_OK)) 
     { 
      IMediaSamplePtr pSample; 
      hr = GetDeliveryBuffer(&pSample, NULL, NULL, 0); 
      if (SUCCEEDED(hr)) 
      { 
       long cThis = min(pSample->GetSize(), cBytes); 
       BYTE* pDest; 
       pSample->GetPointer(&pDest); 
       CopyMemory(pDest, pBuffer, cThis); 
       pSample->SetActualDataLength(cThis); 

       // time stamps indicate file position in bytes 
       LONGLONG tStart = pos; 
       LONGLONG tEnd = pos + cThis; 
       pSample->SetTime(&tStart, &tEnd); 
       hr = Deliver(pSample); 
       if (SUCCEEDED(hr)) 
       { 
        pBuffer += cThis; 
        cBytes -= cThis; 
        pos += cThis; 
       } 
      } 
     } 
    } 
    return hr; 
} 

Answer 1

你有完整的源代碼，直接通過調試器直到你的過濾器調用對端下游過濾器的IPin::Receive，在那裏更新/覆蓋代碼，並且你有完全控制將數據寫入文件等。