IVMRSurfaceAllocator interface (strmif.h)
[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
The IVMRSurfaceAllocator interface is implemented by the default allocator-presenter for the Video Mixing Renderer Filter 7 (VMR-7). It must also be implemented by any plug-in allocator-presenter that an application provides to the VMR-7. The VMR-7 uses the methods on this interface to allocate, prepare and free DirectDraw surfaces. Applications do not use this interface.
For the VMR-9, use the IVMRSurfaceAllocator9 interface.
Inheritance
The IVMRSurfaceAllocator interface inherits from the IUnknown interface. IVMRSurfaceAllocator also has these types of members:
Methods
The IVMRSurfaceAllocator interface has these methods.
| IVMRSurfaceAllocator::AdviseNotify The AdviseNotify method provides the allocator-presenter with the VMR-7 filter's interface for notification callbacks. |
| IVMRSurfaceAllocator::AllocateSurface The AllocateSurface method allocates a DirectDraw surface. |
| IVMRSurfaceAllocator::FreeSurface The FreeSurface method frees the allocated DirectDraw surface. |
| IVMRSurfaceAllocator::PrepareSurface The PrepareSurface method prepares the DirectDraw surface to have the next video frame decoded into it. |
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows XP with SP1 [desktop apps only] |
| Minimum supported server | Windows Server 2003 [desktop apps only] |
| Target Platform | Windows |
| Header | strmif.h (include Dshow.h) |