问题描述
我正在做一个小项目，我需要混合来自内部麦克风和蓝牙耳机（Bose）的传入数据。我以为我会使用WASAPI。但是，虽然我可以轻松读出内置麦克风，但蓝牙耳机却不是这样。 我几乎沿用了Docs给出的示例，但是我做了一个小小的改动，可以使用给出的ID选择自己的“输入设备”（内部麦克风或头戴式耳机）。
以下是方法：
HRESULT RecordAudioStreamBLE(MyAudioSink *pMySink,LPWSTR pwszID)
{
HRESULT hr;
REFERENCE_TIME hnsRequestedDuration = REFTIMES_PER_SEC;
REFERENCE_TIME hnsActualDuration;
UINT32 bufferFrameCount;
UINT32 numFramesAvailable;
IMMDeviceEnumerator *pEnumerator = NULL;
IMMDevice *pDevice = NULL;
IAudioClient *pAudioClient = NULL;
IAudioCaptureClient *pCaptureClient = NULL;
WAVEFORMATEX *pwfx = NULL;
UINT32 packetLength = 0;
BOOL bDone = FALSE;
BYTE *pData;
DWORD flags;
hr = CoInitialize(0);
hr = CoCreateInstance(
CLSID_MMDeviceEnumerator,NULL,CLSCTX_ALL,IID_IMMDeviceEnumerator,(void**)&pEnumerator);
EXIT_ON_ERROR(hr)
hr = pEnumerator->GetDevice(pwszID,&pDevice);
EXIT_ON_ERROR(hr)
hr = pDevice->Activate(IID_IAudioClient,(void**)&pAudioClient);
EXIT_ON_ERROR(hr)
hr = pAudioClient->GetMixFormat(&pwfx);
EXIT_ON_ERROR(hr)
hr = pAudioClient->Initialize(AUDCLNT_SHAREMODE_SHARED,hnsRequestedDuration,pwfx,NULL);
EXIT_ON_ERROR(hr)
// Get the size of the allocated buffer.
hr = pAudioClient->GetBufferSize(&bufferFrameCount);
EXIT_ON_ERROR(hr)
hr = pAudioClient->GetService(IID_IAudioCaptureClient,(void**)&pCaptureClient);
EXIT_ON_ERROR(hr)
// Notify the audio sink which format to use.
hr = pMySink->SetFormat(pwfx);
EXIT_ON_ERROR(hr)
// Calculate the actual duration of the allocated buffer.
hnsActualDuration = (double)REFTIMES_PER_SEC * bufferFrameCount / pwfx->nSamplesPerSec;
hr = pAudioClient->Start(); // Start recording.
EXIT_ON_ERROR(hr)
// Each loop fills about half of the shared buffer.
while (bDone == FALSE)
{
// Sleep for half the buffer duration.
Sleep(hnsActualDuration/REFTIMES_PER_MILLISEC/2);
hr = pCaptureClient->GetNextPacketSize(&packetLength);
EXIT_ON_ERROR(hr)
printf("packet size = %d\n",packetLength);
while (packetLength != 0)
{
// Get the available data in the shared buffer.
hr = pCaptureClient->GetBuffer( &pData,&numFramesAvailable,&flags,NULL);
EXIT_ON_ERROR(hr)
if (flags & AUDCLNT_BUFFERFLAGS_SILENT)
{
pData = NULL; // Tell CopyData to write silence.
}
// Copy the available capture data to the audio sink.
hr = pMySink->CopyData(pData,numFramesAvailable,&bDone);
EXIT_ON_ERROR(hr)
hr = pCaptureClient->ReleaseBuffer(numFramesAvailable);
EXIT_ON_ERROR(hr)
hr = pCaptureClient->GetNextPacketSize(&packetLength);
EXIT_ON_ERROR(hr)
}
}
hr = pAudioClient->Stop(); // Stop recording.
EXIT_ON_ERROR(hr)
Exit:
printf("%s\n",hr);
CoTaskMemFree(pwfx);
SAFE_RELEASE(pEnumerator)
SAFE_RELEASE(pDevice)
SAFE_RELEASE(pAudioClient)
SAFE_RELEASE(pCaptureClient)
return hr;
}
使用内部麦克风的ID进行操作时，一切正常。但是，如果使用了蓝牙设备的ID，则会得到以下输出：（我首先列出所有活动的设备，然后在终端中选择ID：
Endpoint 0: "S24D330 (Intel(R) Display Audio)" ({0.0.0.00000000}.{0f483f83-6e29-482e-94b5-fb9cc257a03d})
Endpoint 1: "Hoofdtelefoon (LE-My headphone Hands-Free AG Audio)" ({0.0.0.00000000}.{75c8e0c3-2e44-4538-940d-f8c2ae6424ca})
Endpoint 2: "Hoofdtelefoon (My headphone Stereo)" ({0.0.0.00000000}.{849b4cc2-ed72-4d40-9725-d1ce6b4abfa0})
Endpoint 3: "Luidsprekers (2- High Definition Audio Device)" ({0.0.0.00000000}.{cb8d7625-257e-4fd0-84b8-26de6aeb1e1b})
Endpoint 4: "Microfoon (2- High Definition Audio Device)" ({0.0.1.00000000}.{5edec961-7a46-4554-bdcd-43fb7d9a9d9a})
Endpoint 5: "Hoofdtelefoon (LE-My headphone Hands-Free AG Audio)" ({0.0.1.00000000}.{f937a0fa-1475-495b-81be-7aec0c1c7ea5})
Which input would you like?5
samples per second 16000
packet size = 0
packet size = 0
packet size = 0
packet size = 0
packet size = 0
packet size = 0
packet size = 0
packet size = 0
packet size = 0
^C
按上述方法在循环中打印数据包大小。显示每次的数据包大小仅为0。 有谁知道如何解决这个问题，只是从中获取“常规”数据？ 是否可能需要使用其他API？速度是关键。
此致
解决方法
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