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42 lines
1.7 KiB
C
42 lines
1.7 KiB
C
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/***************************************************************************
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* *
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* DMusBuff.h -- This module defines the buffer format for DirectMusic *
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* Shared file between user mode and kernel mode components *
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* *
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* Copyright (c) 1998, Microsoft Corp. All rights reserved. *
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* *
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***************************************************************************/
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#ifndef _DMusBuff_
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#define _DMusBuff_
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/* Format of DirectMusic events in a buffer
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*
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* A buffer contains 1 or more events, each with the following header.
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* Immediately following the header is the event data. The header+data
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* size is rounded to the nearest quadword (8 bytes).
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*/
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#include <pshpack4.h> /* Do not pad at end - that's where the data is */
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typedef struct _DMUS_EVENTHEADER *LPDMUS_EVENTHEADER;
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typedef struct _DMUS_EVENTHEADER
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{
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DWORD cbEvent; /* Unrounded bytes in event */
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DWORD dwChannelGroup; /* Channel group of event */
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REFERENCE_TIME rtDelta; /* Delta from start time of entire buffer */
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DWORD dwFlags; /* Flags DMUS_EVENT_xxx */
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} DMUS_EVENTHEADER;
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#include <poppack.h>
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#define DMUS_EVENT_STRUCTURED 0x00000001 /* Unstructured data (SysEx, etc.) */
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/* The number of bytes to allocate for an event with 'cb' data bytes.
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*/
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#define QWORD_ALIGN(x) (((x) + 7) & ~7)
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#define DMUS_EVENT_SIZE(cb) QWORD_ALIGN(sizeof(DMUS_EVENTHEADER) + cb)
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#endif /* _DMusBuff_ */
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