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This structure contains the allocator's count, size, alignment, and prefix properties.
typedef struct _AllocatorProperties {long cBuffers;long cbBuffer;long cbAlign;long cbPrefix;} ALLOCATOR_PROPERTIES;
Members
- cBuffers
Count of buffers at this allocator. - cbBuffer
Size of each buffer in bytes, excluding any prefix. - cbAlign
Alignment of the buffer; buffer start will be aligned on a multiple of this value. - cbPrefix
Each buffer is preceded by a prefix of this many bytes.
Remarks
The CMediaSample::GetPointer member function points to the beginning of the buffer, not including the prefix bytes designated by cbPrefix.
The alignment is applied to the prefix data, if any. If a nonzero prefix is used, the beginning of the prefix is aligned according to cbAlign.
Since the buffer pointer returned by IMediaSample::GetPointer points to the area immediately following the prefix, the cbPrefix address (the value returned by IMediaSample::GetPointer minus cbPrefix) should be aligned on an address that is a multiple of cbAlign bytes.
Requirements
DirectShow applications and DirectShow filters have different include file and link library requirements. See Setting Up the Build Environment for more information.
Pocket PC: Windows Mobile 5.0 and later
Smartphone: Windows Mobile 5.0 and later
OS Versions: Windows CE 2.12 and later. Version 2.12 requires DXPAK 1.0 or later.
Header: Dshow.h.
See Also
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