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ALLOCATOR_PROPERTIES (Windows Embedded CE 6.0)

1/6/2010

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
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

See Also

Reference

DirectShow Structures