www.pudn.com > SGSDK.rar > dmusbuff.h, change:2004-09-27,size:1778b

/*************************************************************************** 
*                                                                          * 
*   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_ */