ALLOCATOR_PROPERTIES Structure

The ALLOCATOR_PROPERTIES structure describes an allocator's count, size, alignment, and prefix properties.

Syntax

typedef struct _AllocatorProperties {
    long cBuffers;
    long cbBuffer;
    long cbAlign;
    long cbPrefix;
} ALLOCATOR_PROPERTIES;

Members

cBuffers

Number of buffers created by the 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 IMediaSample::GetPointer method returns a pointer 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.

See Also

• DirectShow Structures