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vu.inc
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1994-08-06
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;* VU.INC
;*
;* Real VU meter routines
;*
;* Copyright 1994 Petteri Kangaslampi and Jarno Paananen
;*
;* This file is part of the MIDAS Sound System, and may only be
;* used, modified and distributed under the terms of the MIDAS
;* Sound System license, LICENSE.TXT. By continuing to use,
;* modify or distribute this file you indicate that you have
;* read the license and understand and accept it fully.
;*
;/***************************************************************************\
;* struct vuInstrument
;* -------------------
;* Description: VU-meter internal instrument structure
;\***************************************************************************/
STRUC vuInstrument
vuInfo DD ? ; pointer to VU information or NULL
slength DW ? ; sample length
loopStart DW ? ; sample loop start
loopEnd DW ? ; sample loop end or 0 if no looping
ENDS
;/***************************************************************************\
;*
;* Function: int vuInit(void);
;*
;* Description: Initializes VU-meters, allocating room for MAXINSTS
;* instruments.
;*
;* Returns: MIDAS error code
;*
;\***************************************************************************/
GLOBAL LANG vuInit : far
;/***************************************************************************\
;*
;* Function: int vuClose(void);
;*
;* Description: Uninitializes VU-meters
;*
;* Returns: MIDAS error code
;*
;\***************************************************************************/
GLOBAL LANG vuClose : far
;/***************************************************************************\
;*
;* Function: int vuPrepare(ushort inst, uchar *sample, ushort slength,
;* ushort loopStart, ushort loopEnd
;*
;* Description: Prepares the VU information for an instrument
;*
;* Input: ushort inst instrument number
;* uchar *sample pointer to sample data
;* ushort slength sample length
;* ushort loopStart sample loop start
;* ushort loopEnd sample loop end (0 if no looping)
;*
;* Returns: MIDAS error code
;*
;\***************************************************************************/
GLOBAL LANG vuPrepare : far
;/***************************************************************************\
;*
;* Function: int vuRemove(ushort inst);
;*
;* Description: Removes and deallocates the VU information for an instrument
;*
;* Input: ushort inst instrument number
;*
;* Returns: MIDAS error code
;*
;\***************************************************************************/
GLOBAL LANG vuRemove : far
;/***************************************************************************\
;*
;* Function: int vuMeter(ushort inst, ulong rate, ushort pos,
;* ushort volume, ushort *meter);
;*
;* Description: Calculates the VU-meter value (0-64) for the next 1/50th of
;* a second
;*
;* Input: ushort inst instrument that is played
;* ushort rate playing rate
;* ushort volume playing volume (0-64)
;* ushort *meter pointer to VU-meter value
;*
;* Returns: MIDAS error code.
;* VU-meter value (0-64) is stored in *meter
;*
;\***************************************************************************/
GLOBAL LANG vuMeter : far
;/***************************************************************************\
;* enum vuFunctIDs
;* ---------------
;* Description: ID numbers for real VU-meter functions
;\***************************************************************************/
ENUM vuFunctIDs \
ID_vuInit = ID_vu, \
ID_vuClose, \
ID_vuPrepare, \
ID_vuRemove, \
ID_vuMeter