如何在媒体基础上捕捉声音？ [英] how to capture sound on media foundation?
问题描述
我想捕获存储到文件中的声音
i want to capture sound to store into file
我做了如下的事情：
HRESULT CTsAudio :: EnumAudioCapture（IMFMediaSource） ** ppMediaSource）
{
IMFActivate ** ppActivate;
IMFAttributes * pAttributes = NULL;
UINT32 uSourceAcitvate = 0;
HRESULT CTsAudio::EnumAudioCapture(IMFMediaSource **ppMediaSource)
{
IMFActivate **ppActivate ;
IMFAttributes *pAttributes = NULL;
UINT32 uSourceAcitvate = 0;
HRESULT hr = MFCreateAttributes（& pAttributes，1）;
if（FAILED（hr））
{
return hr;
}
HRESULT hr = MFCreateAttributes(&pAttributes,1);
if (FAILED(hr))
{
return hr;
}
hr = pAttributes-> SetGUID（MF_DEVSOURCE_ATTRIBUTE_SOURCE_TYPE，MF_DEVSOURCE_ATTRIBUTE_SOURCE_TYPE_AUDCAP_GUID）;
hr = pAttributes->SetGUID(MF_DEVSOURCE_ATTRIBUTE_SOURCE_TYPE, MF_DEVSOURCE_ATTRIBUTE_SOURCE_TYPE_AUDCAP_GUID);
if（（FAILED（hr）））
{
return hr;
}
if ((FAILED(hr)))
{
return hr;
}
hr = MFEnumDeviceSources（pAttributes，& ppActivate，& uSourceAcitvate）;
if（SUCCEEDED（hr））
{
if（uSourceAcitvate> 0）
{
hr = ppActivate [0] - > ActivateObject（IID_PPV_ARGS（ppMediaSource））;
if（FAILED（hr））
{
hr = E_FAIL;
}
}
hr = MFEnumDeviceSources(pAttributes, &ppActivate,&uSourceAcitvate);
if (SUCCEEDED(hr))
{
if (uSourceAcitvate > 0)
{
hr = ppActivate[0]->ActivateObject(IID_PPV_ARGS(ppMediaSource));
if (FAILED(hr))
{
hr = E_FAIL;
}
}
for（UINT32 i = 0; i< uSourceAcitvate; i ++）
{ // ppActivate [i] - > ; ShutdownObject（）;
ppActivate [i] - > Release（）;
}
}
else
{
hr = E_FAIL;
}
// CoTaskMemFree（ppActivate ）;;
return hr;
}
for (UINT32 i = 0;i < uSourceAcitvate;i++)
{ //ppActivate[i]->ShutdownObject();
ppActivate[i]->Release();
}
}
else
{
hr = E_FAIL;
}
//CoTaskMemFree(ppActivate);
return hr;
}
IMFMediaSource * pMeidaSource = NULL;
IMFMediaType * pMediaType = NULL;
IMFMediaSource *pMeidaSource = NULL;
IMFMediaType *pMediaType = NULL;
HRESULT hr = EnumAudioCapture（& pMeidaSource）;
if（FAILED（hr））
{
return hr;
}
HRESULT hr = EnumAudioCapture(&pMeidaSource);
if (FAILED(hr))
{
return hr;
}
hr = MFCreateSourceReaderFromMediaSource（pMeidaSource，NULL，& m_pMediaSourceR eader）;
hr = MFCreateSourceReaderFromMediaSource(pMeidaSource,NULL,&m_pMediaSourceReader);
hr = m_pMediaSourceReader-> GetNativeMediaType（0,0，& pMediaType）;
hr = m_pMediaSourceReader-> SetCurrentMediaType（0，NULL，pMediaType）;
BOOL fSelected = TRUE;
hr = m_pMediaSourceReader-> SetStreamSelection（0，TRUE）;
return hr;
hr = m_pMediaSourceReader->GetNativeMediaType(0,0,&pMediaType);
hr = m_pMediaSourceReader->SetCurrentMediaType(0,NULL,pMediaType);
BOOL fSelected = TRUE;
hr = m_pMediaSourceReader->SetStreamSelection(0,TRUE);
return hr;
和我使用m_pMediaSourceReader中的pMediaType设置IMFSinkWriter :: AddStream（）;
and i set IMFSinkWriter::AddStream() by using pMediaType from m_pMediaSourceReader;
并设置IMFSinkWriter :: SetInputStream（）
and i set IMFSinkWriter::SetInputStream()
hr = pMediaType-> SetGUID（MF_MT_MAJOR_TYPE，MFMediaType_Audio）;
if（SUCCEEDED（hr））
{
hr = pMediaType-> ; SetGUID（MF_MT_SUBTYPE，MFAudioFormat_WMAudioV8）;
}
hr = pMediaType->SetGUID(MF_MT_MAJOR_TYPE, MFMediaType_Audio);
if (SUCCEEDED(hr))
{
hr = pMediaType->SetGUID(MF_MT_SUBTYPE, MFAudioFormat_WMAudioV8);
}
HRESULT hr = MFCreateSinkWriterFromURL（L" bcbb.wmv" ，NULL，NULL和& m_pSinkWriter）;
HRESULT hr = MFCreateSinkWriterFromURL(L"bcbb.wmv",NULL,NULL,&m_pSinkWriter);
我发现我无法在bcbb.wmv和IMFSinkWriter ::中获取任何数据:: WriterSample（）返回S_OK 。 &NBSP;&NBSP;&NBSP;&NBSP; bcbb.wmv为空。
i found that i can't get any data in bcbb.wmv and IMFSinkWriter::WriterSample() returns S_OK . bcbb.wmv is empty.
有人帮忙！
或者你可以给我用一个简短的程序来描述一下？代码示例更好。
Or can you give me a brief procedure to describe that? a code example is better.
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