ALLOCATOR_PROPERTIES
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4/8/2010
This structure contains the allocator's count, size, alignment, and prefix properties.
Syntax
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
| Header | dshow.h |
| Windows Embedded CE | Windows CE 2.12 and later |
| Windows Mobile | Pocket PC for Windows Mobile Version 5.0 and later, Smartphone for Windows Mobile Version 5.0 and later |
| Note | Microsoft DirectShow applications and DirectShow filters have different include file and Library requirements For more information, see Setting Up the Build Environment, Version 2.12 requires DXPAK 1.0 or later |