IMMDevice::Activate and specifying IID_IBaseFilter as the interface identifier

转载于 2017-10-31 17:16:00 发布 · 213 阅读

本文介绍如何使用IMMDevice指针激活DirectShow音频流API并准备进行流传输。通过调用IMMDevice::Activate并指定IID_IBaseFilter作为接口标识来创建DirectShow COM对象。然后利用此COM对象构建DirectShow过滤器图表。

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Use the IMMDevice pointer to the endpoint returned by the enumeration process to activate the desired audio streaming API and prepare for streaming. Different audio APIs require slightly different preparation.
For DShow audio applications:
Create a DirectShow COM object by calling IMMDevice::Activate and specifying IID_IBaseFilter as the interface identifier.

IUnknown *pDShowFilter = NULL;
...
hr = pDevice->Activate (
                  IID_IBaseFilter,
                  CLSCTX_INPROC_SERVER, NULL,
                  reinterpret_cast<void **>(&pDShowFilter));


Build a DirectShow filter graph with this COM object activated by the device. For more information about this process, see "Building the Filter Graph" in DirectShow SDK documentation.