ALLOCATOR_PROPERTIES (Compact 2013)
3/26/2014
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 |
Library |
Strmiids.lib |