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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::GetPointermember 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::GetPointerpoints to the area immediately following the prefix, the cbPrefixaddress (the value returned by IMediaSample::GetPointerminus cbPrefix) should be aligned on an address that is a multiple of cbAlignbytes.