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For some advanced functionality, the IWMReaderCallback must support this interface.
In addition to the methods inherited from IUnknown, the IWMReaderCallbackAdvanced interface exposes the following methods.
| Method | Description |
| AllocateForOutput | Allocates a buffer for samples delivered to the IWMReaderCallback::OnSample method. |
| AllocateForStream | Allocates a buffer for samples delivered to the IWMReaderCallback::OnStreamSample method. |
| OnOutputPropsChanged | Called when the output media properties change due to a IWMReader::SetOutputProps call. |
| OnStreamSample | Enables the application to work with compressed rather than uncompressed samples. |
| OnStreamSelection | Notifies the application of stream changes made due to bandwidth restrictions. |
| OnTime | Notifies the application of the clock time the reader is working to. This is used when a user-driven clock has been specified. |
See Also
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