Windows Media Player 11 SDK About Allocating Streaming Resources
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About Allocating Streaming Resources
The sample DSP plug-in generated by the Windows Media Player Plug-in Wizard does not require any additional streaming buffers. However, you might want to allocate memory resources for your DSP plug-in. For example, a plug-in that produces an echo effect would require a secondary buffer to create the necessary time delay.
The IMediaObject interface contains two methods to handle this situation. Windows Media Player calls IMediaObject::AllocateStreamingResources to give you an opportunity to create any buffers you require. Windows Media Player later calls IMediaObject::FreeStreamingResources to allow you to free any memory you allocated previously. The sample DSP plug-in implementation also calls FreeStreamingResources from CProjectName::FinalRelease to ensure that all resources are freed before the plug-in object is destroyed.
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