我使用Microsoft MSDN提供的教程来枚举音频设备 .
这是枚举代码:
HRESULT CreateAudioDeviceSource(IMFMediaSource **ppSource)
{
*ppSource = NULL;
IMFMediaSource *pSource = NULL;
IMFAttributes *pAttributes = NULL;
IMFActivate **ppDevices = NULL;
// Create an attribute store to specify the enumeration parameters.
HRESULT hr = MFCreateAttributes(&pAttributes, 1);
if (FAILED(hr))
{
goto done;
}
// Source type: audio capture devices
hr = pAttributes->SetGUID(
MF_DEVSOURCE_ATTRIBUTE_SOURCE_TYPE,
MF_DEVSOURCE_ATTRIBUTE_SOURCE_TYPE_AUDCAP_GUID
);
if (FAILED(hr))
{
goto done;
}
// Enumerate devices.
UINT32 count;
hr = MFEnumDeviceSources(pAttributes, &ppDevices, &count);
std::cout << count;
if (FAILED(hr))
{
std::cout << "Enum Failed";
goto done;
}
if (count == 0)
{
std::cout << "empty";
hr = E_FAIL;
goto done;
}
// Create the media source object.
hr = ppDevices[0]->ActivateObject(IID_PPV_ARGS(&pSource));
if (FAILED(hr))
{
goto done;
}
*ppSource = pSource;
(*ppSource)->AddRef();
done:
SafeRelease(&pAttributes);
for (DWORD i = 0; i < count; i++)
{
SafeRelease(&ppDevices[i]);
}
CoTaskMemFree(ppDevices);
SafeRelease(&pSource);
return hr;
}
但我没有调用该函数来枚举该设备 . 我收到消息“Enum Failed” . 所以我不知道问题发生的原因 .
拜托,非常感谢!
参考:https://msdn.microsoft.com/en-us/library/dd317912(v=vs.85).aspx
1 回答
Windows Media Foundation的示例代码枚举音频设备,设备捕获
struct
和
enum
设备方法 .GetAudioCaptureDevices
是'MediaCapture'类中的静态方法,可以随时调用 .