AUDCLNT_BUFFERFLAGS_DATA_DISCONTINUITY有时设置，有时不设置

Question

我尝试使用WASAPI为Windows phone8制作一个简单的VoIP应用程序。在项目的一些运行中通过调用

hr = m_pCaptureClient->GetBuffer(&pbData, &nFrames, &dwFlags, nullptr, nullptr)

几分钟后dwFlags重复设置为1（AUDCLNT_BUFFERFLAGS_DATA_DISCONTINUITY）并且返回的数据包变得越来越小，并且在此期间口吃变得越来越多但是在项目的某些运行中一切都很好并且语音完全清晰。

有人可以帮忙吗？

  //MAX_RAW_BUFFER_SIZE 320

     void BackEndAudio::CaptureThread(Windows::Foundation::IAsyncAction^ operation)
{
    uint8_t amrEncodedData[13];
    uint8_t SendingData[14];
    HRESULT hr = m_pDefaultCaptureDevice->Start();
    BYTE *pLocalBuffer = new BYTE[MAX_RAW_BUFFER_SIZE];
    HANDLE eventHandles[] = {
                             hCaptureEvent,        // WAIT_OBJECT0 
                             hShutdownEvent        // WAIT_OBJECT0 + 1
                            };

    if (SUCCEEDED(hr) && pLocalBuffer)  
    { 
        unsigned int uAccumulatedBytes = 0;
        while (SUCCEEDED(hr))
        {
            DWORD waitResult = WaitForMultipleObjectsEx(SIZEOF_ARRAY(eventHandles), eventHandles, FALSE, INFINITE, FALSE);
             if (WAIT_OBJECT_0 == waitResult)
            {
                BYTE* pbData = nullptr;
                UINT32 nFrames = 0;
                DWORD dwFlags = 0;
                if (SUCCEEDED(hr))
                {

                    hr = m_pCaptureClient->GetBuffer(&pbData, &nFrames, &dwFlags, nullptr, nullptr);//Retrieves a pointer to the next available packet of data in the capture endpoint buffer. 

                    unsigned int incomingBufferSize = nFrames * m_sourceFrameSizeInBytes;
                    if (*SendFrameNo==(uint8_t)256) 
                        *SendFrameNo=0;
                    if(dwFlags==1)
                        glitch++;
                        while(MAX_RAW_BUFFER_SIZE - uAccumulatedBytes < incomingBufferSize)
                        {

                            memcpy(pLocalBuffer + uAccumulatedBytes, pbData,MAX_RAW_BUFFER_SIZE-uAccumulatedBytes);

                            if (transportController)
                            {
                                short *tempbuffer=new short[160];
                                for(int i=0;i<160;i++)
                                {
                                    BToS.buf[0]=pLocalBuffer[i*2];
                                    BToS.buf[1]=pLocalBuffer[i*2+1];
                                    tempbuffer[i]=BToS.shbuf;
                                }
                                bool bRet = EasyVAD_IsSilence(hVAD,tempbuffer,160);
                                if(!bRet)
                                {
                                    Encoder_Interface_Encode(amren, MR475, (const short *)pLocalBuffer, amrEncodedData, 0);
                                    memcpy(SendingData,SendFrameNo,1);
                                    memcpy(SendingData+1,amrEncodedData,13);
                                    transportController->Write(SendingData, 14);
                                    (*SendFrameNo)++;
                                }

                            }
                            pbData+=(MAX_RAW_BUFFER_SIZE-uAccumulatedBytes);
                            incomingBufferSize-=(MAX_RAW_BUFFER_SIZE-uAccumulatedBytes);
                            uAccumulatedBytes=0;
                        }

                    if(MAX_RAW_BUFFER_SIZE - uAccumulatedBytes == incomingBufferSize)
                    {
                        memcpy(pLocalBuffer + uAccumulatedBytes, pbData, incomingBufferSize);
                        if (transportController)
                        {
                            short *tempbuffer=new short[160];
                            for(int i=0;i<160;i++)
                                {
                                    BToS.buf[0]=pLocalBuffer[i*2];
                                    BToS.buf[1]=pLocalBuffer[i*2+1];
                                    tempbuffer[i]=BToS.shbuf;
                                }
                                bool bRet = EasyVAD_IsSilence(hVAD,tempbuffer,160);
                                if(!bRet)
                                {
                                    Encoder_Interface_Encode(amren, MR475, (const short *)pLocalBuffer, amrEncodedData, 0);
                                    memcpy(SendingData,SendFrameNo,1);
                                    memcpy(SendingData+1,amrEncodedData,13);
                                    transportController->Write(SendingData, 14);
                                    (*SendFrameNo)++;
                                }

                        }
                        // Reset our counter
                        uAccumulatedBytes = 0;
                    }
                    else if(MAX_RAW_BUFFER_SIZE - uAccumulatedBytes > incomingBufferSize)
                    {
                        memcpy(pLocalBuffer + uAccumulatedBytes, pbData, incomingBufferSize);
                        uAccumulatedBytes += incomingBufferSize;
                    }

                }

                 if (SUCCEEDED(hr))
                {
                    hr = m_pCaptureClient->ReleaseBuffer(nFrames);
                }
            }
            else if (WAIT_OBJECT_0 + 1 == waitResult)
            {
                // We're being asked to shutdown
                break;
            }
            else
            {
                // Unknown return value
                DbgRaiseAssertionFailure();
            }
        }
    }
    delete[] pLocalBuffer;
}

我知道代码在每个GetBuffer调用之间做了很多工作，这可能是时间故障的主要问题，但我的问题是为什么有时它会发生，有时不会？