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