bool gst_dshow_configure_latency (IPin *pCapturePin, guint bufSizeMS)
{
HRESULT hr;
ALLOCATOR_PROPERTIES alloc_prop;
IAMBufferNegotiation * pNeg = NULL;
hr = pCapturePin->QueryInterface(IID_IAMBufferNegotiation, (void **)&pNeg);
if(!SUCCEEDED (hr))
return FALSE;
alloc_prop.cbAlign = -1; // -1 means no preference.
alloc_prop.cbBuffer = bufSizeMS;
alloc_prop.cbPrefix = -1;
alloc_prop.cBuffers = -1;
hr = pNeg->SuggestAllocatorProperties (&alloc_prop);
return SUCCEEDED (hr);
}
/// 设置音频信息
BOOL CAudioCapture::SetAudioFormat(ENUM_FREQUENCY_TYPE enFrequency,
ENUM_CHANNEL_TYPE enChannel, ENUM_SAMPLE_TYPE enSample)
{
if(NULL != m_pCaptureFilter)
{
BOOL bResult = FALSE;
do
{
IPin* pOutPin = GetOutputPin(m_pCaptureFilter, (uint16_t)0);
if(NULL != pOutPin)
{
IAMBufferNegotiation *pNeg = NULL;
IAMStreamConfig *pCfg = NULL;
// Get buffer negotiation interface
HRESULT hr = pOutPin->QueryInterface(IID_IAMBufferNegotiation, (void **)&pNeg);
if (FAILED(hr))
{
pOutPin->Release();
break;
}
// Find number of bytes in one second
long lBytesPerSecond = (long) (enSample * enFrequency * enChannel);
// 针对FAAC编码器 做出的调整
long lBufferSize = 1024 * enSample * enChannel;
// Set the buffer size based on selected settings
ALLOCATOR_PROPERTIES prop={0};
prop.cbBuffer = lBufferSize;
prop.cBuffers = 6;
prop.cbAlign = enSample * enChannel;
hr = pNeg->SuggestAllocatorProperties(&prop);
pNeg->Release();
// Now set the actual format of the audio data
hr = pOutPin->QueryInterface(IID_IAMStreamConfig, (void **)&pCfg);
if (FAILED(hr))
{
pOutPin->Release();
break;
}
// Read current media type/format
AM_MEDIA_TYPE *pmt={0};
hr = pCfg->GetFormat(&pmt);
if (SUCCEEDED(hr))
{
// Fill in values for the new format
WAVEFORMATEX *pWF = (WAVEFORMATEX *) pmt->pbFormat;
pWF->nChannels = (WORD) enChannel;
pWF->nSamplesPerSec = enFrequency;
pWF->nAvgBytesPerSec = lBytesPerSecond;
pWF->wBitsPerSample = (WORD) (enSample * 8);
pWF->nBlockAlign = (WORD) (enSample * enChannel);
// Set the new formattype for the output pin
hr = pCfg->SetFormat(pmt);
UtilDeleteMediaType(pmt);
}
// Release interfaces
pCfg->Release();
pOutPin->Release();
bResult = TRUE;
}
}while(FALSE);
return bResult;
}
else
{
m_enFrequency = enFrequency;
m_enChannel = enChannel;
m_enSample = enSample;
return TRUE;
}
}
BOOL CBoxView::APlaying()
{
if (m_pGraph == NULL)
{
return FALSE;
}
CComPtr<IBaseFilter> pAudioInputFilter;
HRESULT hr = S_OK;
//查找audio filter并加入graph
hr = FindInputFilters((void**)&pAudioInputFilter, CLSID_AudioInputDeviceCategory);
if (NULL == pAudioInputFilter)
{
TRACE(L"[SVC] CBoxView:: Could not create the Filter AudioInputFilter");
return FALSE;
}
CComPtr<IPin> pinIn;
CComPtr<IAMAudioInputMixer> pPinMixer;
GetUnconnectedPin(pAudioInputFilter, PINDIR_INPUT, &pinIn);
hr = pinIn->QueryInterface(IID_IAMAudioInputMixer, (void **)&pPinMixer);
if (SUCCEEDED(hr))
{
hr = pPinMixer->put_Enable(TRUE);
}
hr = m_pGraph->AddFilter(pAudioInputFilter, L"ACapture");
//创建render filter并加入graph
CComPtr <IBaseFilter> pAudioRenderer = NULL;
hr = CoCreateInstance(CLSID_AudioRender, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void **)&pAudioRenderer);
hr = m_pGraph->AddFilter(pAudioRenderer, L"Audio Renderer");
if (pAudioRenderer == NULL)
{
TRACE(L"[SVC] CBoxView:: Could not create the Filter AudioRenderer");
return FALSE;
}
//获取麦克风输出脚
CComPtr<IPin> pAudioOutput;
CComPtr<IEnumPins> pEnum;
pAudioInputFilter->EnumPins(&pEnum);
hr = pEnum->Reset();
hr = pEnum->Next(1, &pAudioOutput, NULL);
//设置麦克风输出脚
IAMStreamConfig *pCfg = NULL;
hr = pAudioOutput->QueryInterface(IID_IAMStreamConfig, (void **)&pCfg);
// Read current media type/format
AM_MEDIA_TYPE *pmt = { 0 };
hr = pCfg->GetFormat(&pmt);
WAVEFORMATEX *pWF = (WAVEFORMATEX *)pmt->pbFormat;
// Release interfaces
pCfg->Release();
//设置麦克风输出脚缓冲
IAMBufferNegotiation *pNeg;
pAudioOutput->QueryInterface(IID_IAMBufferNegotiation, (void **)&pNeg);
ALLOCATOR_PROPERTIES prop = { 0 };
prop.cbBuffer = pWF->nAvgBytesPerSec * 50 / 1000;
prop.cBuffers = -1;
prop.cbAlign = -1;
prop.cbPrefix = -1;
hr = pNeg->SuggestAllocatorProperties(&prop);
pNeg->Release();
#if 0
//method 1:Render RUN
hr = m_pCGB->RenderStream(&PIN_CATEGORY_PREVIEW,
&MEDIATYPE_Audio,
pAudioInputFilter,
NULL,
NULL);
#else
//method 2:Connect RUN
hr = ConnectFilters(m_pGraph, pAudioOutput, pAudioRenderer);
#endif
return FAILED(hr);
}