vtdapi.h

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/*****************************************************************************
//;
//  VTDAPI.INC
//;
//  VTDAPI service equates and structures
//;
*****************************************************************************/

#define	MULTIMEDIA_OEM_ID	0x0440		       // MS Reserved OEM # 34
#define	VTDAPI_DEVICE_ID	MULTIMEDIA_OEM_ID + 2  // VTD API Device

/* VTDAPI_Get_Version
//;
//   ENTRY:
//	AX = 0
//	ES:BX = pointer to VTDAPI_Get_Version_Parameters structure
//
//   RETURNS:
//	SUCCESS: AX == TRUE
//	ERROR:   AX == FALSE
*/
#define	VTDAPI_Get_Version	0

/* VTDAPI_Begin_Min_Int_Period
//;
//   ENTRY:
//	AX = 1
//	CX = interrupt period in ms
//
//   RETURNS:
//	SUCCESS: AX != 0
//	ERROR:   AX == 0
*/
#define	VTDAPI_Begin_Min_Int_Period	1

/* VTDAPI_End_Min_Int_Period
//;
//   ENTRY:
//	AX = 2
//	ES:BX = pointer to word interrupt period in ms
//;
//   RETURNS:
//	SUCCESS: AX == TIMERR_NOERROR
//	ERROR:   AX == TIMERR_NOCANDO
*/
#define	VTDAPI_End_Min_Int_Period	2

/* VTDAPI_Get_Int_Period
//;
//   ENTRY:
//	AX = 3
//;
//   RETURNS:
//	DX:AX = current period (resolution) in ms
*/
#define	VTDAPI_Get_Int_Period	3

/* VTDAPI_Get_Sys_Time
//;
//   ENTRY:
//	AX = 4
//;
//   RETURNS:
//	DX:AX = current time in ms
*/
#define	VTDAPI_Get_Sys_Time	4

/* VTDAPI_Timer_Start
//;
//   ENTRY:
//	AX = 5
//	ES:BX = pointer to VTDAPI_Timer_Parameters structure
//;
//   RETURNS:
//	SUCCESS: AX != 0, 16 bit timer handle
//	ERROR:   AX == 0
*/
#define	VTDAPI_Timer_Start	5

/* VTDAPI_Timer_Stop
//;
//   ENTRY:
//	AX = 6
//	CX = 16 bit timer handle from VTDAPI_Timer_Start
//;
//   RETURNS:
//	SUCCESS: AX == TIMERR_NOERROR
//	ERROR:   AX == TIMERR_NOCANDO, invalid timer handle
*/
#define	VTDAPI_Timer_Stop	6

/* VTDAPI_Start_User_Timer
//;
//   ENTRY:
//	AX = 7
//	ES:BX = pointer to VTDAPI_Timer_Parameters structure
//;
//   RETURNS:
//	SUCCESS: EAX != 0, 32 bit timer handle
//	ERROR:   EAX == 0
*/
#define	VTDAPI_Start_User_Timer	7

/* VTDAPI_Stop_User_Timer
//;
//   ENTRY:
//	AX = 8
//	ES:BX = pointer to 32 bit timer handle from VTDAPI_Start_User_Timer
//;
//   RETURNS:
//	SUCCESS: AX == 0
//	ERROR:   AX != 0
*/
#define	VTDAPI_Stop_User_Timer	8

/* VTDAPI_Get_System_Time_Selector
//;
//   ENTRY:
//	AX = 9
//;
//   RETURNS:
//	SUCCESS: AX = R/O selector to a dword of running ms
//	ERROR:   AX == 0
*/
#define	VTDAPI_Get_System_Time_Selector	9

/* VTDAPI_Cleanup_Timers
//;
//   ENTRY:
//	AX = 10
//	CX = CS selector
//;
//   RETURNS:
//	NONE
*/
#define	VTDAPI_Cleanup_Timers	10

typedef struct VTDAPI_Get_Version_Parameters {
	DWORD	VTDAPI_Version;
	DWORD	VTDAPI_Min_Period;
	DWORD	VTDAPI_Max_Period;
} VTDAPI_Get_Version_Parameters;

typedef struct VTDAPI_Timer_Parameters {
	WORD	VTDAPI_Timer_Period;
	WORD	VTDAPI_Timer_Resolution;
	DWORD	VTDAPI_Timer_IPCS;
	DWORD	VTDAPI_Timer_Inst;
	WORD	VTDAPI_Timer_Flags;
} VTDAPI_Timer_Parameters;

#ifndef TIME_ONESHOT
#define	TIME_ONESHOT		0x0000	// program timer for single event
#define	TIME_PERIODIC		0x0001	// program for continuous periodic event
#endif

#ifndef TIMERR_BASE
#define	TIMERR_BASE	96
#define	TIMERR_NOERROR	0		 // no error
#define	TIMERR_NOCANDO	(TIMERR_BASE+1)  // the operation wasn't executed
#endif