| UID | title | description | helpviewer_keywords | old-location | tech.root | ms.assetid | ms.date | ms.keywords | req.header | req.include-header | req.target-type | req.target-min-winverclnt | req.target-min-winversvr | req.kmdf-ver | req.umdf-ver | req.ddi-compliance | req.unicode-ansi | req.idl | req.max-support | req.namespace | req.assembly | req.type-library | req.lib | req.dll | req.irql | targetos | req.typenames | req.redist | ms.custom | f1_keywords | dev_langs | topic_type | api_type | api_location | api_name | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
NF:strmif.IVMRSurfaceAllocator.AllocateSurface |
IVMRSurfaceAllocator::AllocateSurface (strmif.h) |
The AllocateSurface method allocates a DirectDraw surface. |
|
dshow\ivmrsurfaceallocator_allocatesurface.htm |
dshow |
6783df91-c92f-45d0-b299-16cdbc4bb630 |
4/26/2023 |
AllocateSurface, AllocateSurface method [DirectShow], AllocateSurface method [DirectShow],IVMRSurfaceAllocator interface, IVMRSurfaceAllocator interface [DirectShow],AllocateSurface method, IVMRSurfaceAllocator.AllocateSurface, IVMRSurfaceAllocator::AllocateSurface, IVMRSurfaceAllocatorAllocateSurface, dshow.ivmrsurfaceallocator_allocatesurface, strmif/IVMRSurfaceAllocator::AllocateSurface |
strmif.h |
Dshow.h |
Windows |
Windows XP with SP1 [desktop apps only] |
Windows Server 2003 [desktop apps only] |
Strmiids.lib |
Windows |
19H1 |
|
|
|
|
|
|
[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 AllocateSurface method allocates a DirectDraw surface.
An application-defined DWORD_PTR cookie that uniquely identifies this instance of the VMR for use in scenarios when one instance of the allocator-presenter is used with multiple VMR instances.
Specifies the VMRALLOCATIONINFO structure. See Remarks.
[out] On input this parameter is used to request the number of buffers desired. On output it receives the actual number of buffers created.
Address of a pointer that receives the Direct3D surface.
If the method succeeds, it returns S_OK. If it fails, it returns an error code.
| Return code | Description |
|---|---|
|
One of the pointers is invalid. |
|
In dwFlags, the AMAP_3D_TARGET was combined with AMAP_FORCE_SYSMEM or AMAP_ALLOW_SYSMEM. |
|
One or more members of the BITMAPINFOHEADER structure specified by lpAllocInfo->lpHdr is incorrect. |
Before calling AllocateSurface explicitly, a client application should call IVMRSurfaceAllocator::FreeSurface to be sure that the DirectDraw decoding surface front buffer is NULL. If it is not NULL at the time an application calls AllocateSurface, the debug version of quartz.dll will cause an assertion.
When implementing this method in a custom allocator-presenter, you must examine the value of lpAllocInfo->lpHdr->biBitCount. If biBitCount is zero, then you must set it to the pixel depth for the current display. If BiBitCount is left at zero, the surface allocation will fail and a new (default) VMR will be created.