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1 /***************************************************************************
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2 * *
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3 * DMusBuff.h -- This module defines the buffer format for DirectMusic *
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4 * Shared file between user mode and kernel mode components *
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5 * *
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6 * Copyright (c) 1998, Microsoft Corp. All rights reserved. *
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7 * *
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8 ***************************************************************************/
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9
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10 #ifndef _DMusBuff_
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11 #define _DMusBuff_
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12
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13 /* Format of DirectMusic events in a buffer
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14 *
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15 * A buffer contains 1 or more events, each with the following header.
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16 * Immediately following the header is the event data. The header+data
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17 * size is rounded to the nearest quadword (8 bytes).
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18 */
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19
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20 #include <pshpack4.h> /* Do not pad at end - that's where the data is */
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21 typedef struct _DMUS_EVENTHEADER *LPDMUS_EVENTHEADER;
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22 typedef struct _DMUS_EVENTHEADER
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23 {
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24 DWORD cbEvent; /* Unrounded bytes in event */
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25 DWORD dwChannelGroup; /* Channel group of event */
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26 REFERENCE_TIME rtDelta; /* Delta from start time of entire buffer */
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27 DWORD dwFlags; /* Flags DMUS_EVENT_xxx */
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28 } DMUS_EVENTHEADER;
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29 #include <poppack.h>
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30
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31 #define DMUS_EVENT_STRUCTURED 0x00000001 /* Unstructured data (SysEx, etc.) */
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32
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33 /* The number of bytes to allocate for an event with 'cb' data bytes.
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34 */
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35 #define QWORD_ALIGN(x) (((x) + 7) & ~7)
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36 #define DMUS_EVENT_SIZE(cb) QWORD_ALIGN(sizeof(DMUS_EVENTHEADER) + cb)
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37
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38
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39 #endif /* _DMusBuff_ */
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40
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41
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