2.2.5.4.1 Set Allocator Properties Message (SET_ALLOCATOR)
The SET_ALLOCATOR message MAY<2> be sent from the server to the client to set buffer allocation properties for a stream. For more information about allocators, see [MSDN-ALLOCATOR].
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Header (variable) |
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PresentationId (16 bytes) |
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StreamId |
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cBuffers |
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cbBuffer |
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cbAlign |
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cbPrefix |
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Header (variable): The common message header (as specified in section 2.2.1). The InterfaceId field MUST be set to 0x00000000. The Mask field MUST be set to STREAM_ID_PROXY. The FunctionId field MUST be set to SET_ALLOCATOR (0x00000112).
PresentationId (16 bytes): A 16-byte GUID that identifies the presentation.
StreamId (4 bytes): A 32-bit unsigned integer that identifies the stream ID.
cBuffers (4 bytes): A 32-bit unsigned integer that indicates the number of buffers created by the allocator.
cbBuffer (4 bytes): A 32-bit unsigned integer that indicates the size of each buffer, in bytes, excluding any prefix.
cbAlign (4 bytes): A 32-bit unsigned integer that indicates the alignment of the buffer. The buffer start MUST be aligned on a multiple of this value.
cbPrefix (4 bytes): A 32-bit unsigned integer that indicates that each buffer is preceded by a prefix of this many bytes.