ref: 4c510b80e7330e4cb77b1b564483f1b5c3a2dd0f
dir: /Game/src/audiolib/adlibfx.c/
/*
Copyright (C) 1994-1995 Apogee Software, Ltd.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/**********************************************************************
module: ADLIBFX.C
author: James R. Dose
date: April 1, 1994
Low level routines to support Adlib sound effects created by Muse.
(c) Copyright 1994 James R. Dose. All Rights Reserved.
**********************************************************************/
#include <dos.h>
#include <stdlib.h>
#include <conio.h>
#include "dpmi.h"
#include "task_man.h"
#include "interrup.h"
#include "al_midi.h"
#include "adlibfx.h"
#define TRUE ( 1 == 1 )
#define FALSE ( !TRUE )
static void ADLIBFX_SendOutput( int reg, int data );
static void ADLIBFX_Service( task *Task );
static long ADLIBFX_LengthLeft;
static int ADLIBFX_Block;
static ALSound *ADLIBFX_Sound = NULL;
static char *ADLIBFX_SoundPtr = NULL;
static int ADLIBFX_Priority;
static unsigned long ADLIBFX_CallBackVal;
static void ( *ADLIBFX_CallBackFunc )( unsigned long ) = NULL;
static int ADLIBFX_SoundVolume;
static int ADLIBFX_TotalVolume = ADLIBFX_MaxVolume;
static task *ADLIBFX_ServiceTask = NULL;
static int ADLIBFX_VoiceHandle = ADLIBFX_MinVoiceHandle;
int ADLIBFX_Installed = FALSE;
int ADLIBFX_ErrorCode = ADLIBFX_Ok;
#define ADLIBFX_SetErrorCode( status ) \
ADLIBFX_ErrorCode = ( status );
/*---------------------------------------------------------------------
Function: ADLIBFX_ErrorString
Returns a pointer to the error message associated with an error
number. A -1 returns a pointer the current error.
---------------------------------------------------------------------*/
char *ADLIBFX_ErrorString
(
int ErrorNumber
)
{
char *ErrorString;
switch( ErrorNumber )
{
case ADLIBFX_Warning :
case ADLIBFX_Error :
ErrorString = ADLIBFX_ErrorString( ADLIBFX_ErrorCode );
break;
case ADLIBFX_Ok :
ErrorString = "Adlib FX ok.";
break;
case ADLIBFX_NoVoices :
ErrorString = "No free voices available in Adlib FX.";
break;
case ADLIBFX_VoiceNotFound :
ErrorString = "No voice with matching handle found.";
break;
case ADLIBFX_DPMI_Error :
ErrorString = "DPMI Error in AdlibFX.";
break;
default :
ErrorString = "Unknown Adlib FX error code.";
break;
}
return( ErrorString );
}
/**********************************************************************
Memory locked functions:
**********************************************************************/
#define ADLIBFX_LockStart ADLIBFX_SendOutput
/*---------------------------------------------------------------------
Function: ADLIBFX_SendOutput
Writes a byte of data to the specified register on the Adlib card.
---------------------------------------------------------------------*/
static void ADLIBFX_SendOutput
(
int reg,
int data
)
{
int i;
int adlib_port = 0x388;
unsigned flags;
flags = DisableInterrupts();
outp( adlib_port, reg );
for( i = 6; i ; i-- )
{
inp( adlib_port );
}
outp( adlib_port + 1, data );
for( i = 35; i ; i-- )
{
inp( adlib_port );
}
RestoreInterrupts( flags );
}
/*---------------------------------------------------------------------
Function: ADLIBFX_Stop
Halts playback of the currently playing sound effect.
---------------------------------------------------------------------*/
int ADLIBFX_Stop
(
int handle
)
{
unsigned flags;
if ( ( handle != ADLIBFX_VoiceHandle ) || ( ADLIBFX_Sound == NULL ) )
{
ADLIBFX_SetErrorCode( ADLIBFX_VoiceNotFound );
return( ADLIBFX_Warning );
}
flags = DisableInterrupts();
ADLIBFX_SendOutput( 0xb0, 0 );
ADLIBFX_Sound = NULL;
ADLIBFX_SoundPtr = NULL;
ADLIBFX_LengthLeft = 0;
ADLIBFX_Priority = 0;
RestoreInterrupts( flags );
if ( ADLIBFX_CallBackFunc )
{
ADLIBFX_CallBackFunc( ADLIBFX_CallBackVal );
}
return( ADLIBFX_Ok );
}
/*---------------------------------------------------------------------
Function: ADLIBFX_Service
Task Manager routine to perform the playback of a sound effect.
---------------------------------------------------------------------*/
static void ADLIBFX_Service
(
task *Task
)
{
int value;
if ( ADLIBFX_SoundPtr )
{
value = *ADLIBFX_SoundPtr++;
if ( value != 0 )
{
ADLIBFX_SendOutput( 0xa0, value );
ADLIBFX_SendOutput( 0xb0, ADLIBFX_Block );
}
else
{
ADLIBFX_SendOutput( 0xb0, 0 );
}
ADLIBFX_LengthLeft--;
if ( ADLIBFX_LengthLeft <= 0 )
{
ADLIBFX_Stop( ADLIBFX_VoiceHandle );
}
}
}
/*---------------------------------------------------------------------
Function: ADLIBFX_SetVolume
Sets the volume of the currently playing sound effect.
---------------------------------------------------------------------*/
int ADLIBFX_SetVolume
(
int handle,
int volume
)
{
unsigned flags;
int carrierlevel;
flags = DisableInterrupts();
if ( ( handle != ADLIBFX_VoiceHandle ) || ( ADLIBFX_Sound == NULL ) )
{
RestoreInterrupts( flags );
ADLIBFX_SetErrorCode( ADLIBFX_VoiceNotFound );
return( ADLIBFX_Warning );
}
volume = min( volume, ADLIBFX_MaxVolume );
volume = max( volume, 0 );
ADLIBFX_SoundVolume = volume;
volume *= ADLIBFX_TotalVolume;
volume /= ADLIBFX_MaxVolume;
carrierlevel = ADLIBFX_Sound->cScale & 0x3f;
carrierlevel ^= 0x3f;
carrierlevel *= ( volume / 2 ) + 0x80;
carrierlevel /= ADLIBFX_MaxVolume;
carrierlevel ^= 0x3f;
carrierlevel |= ADLIBFX_Sound->cScale & 0xc0;
ADLIBFX_SendOutput( 0x43, carrierlevel );
RestoreInterrupts( flags );
return( ADLIBFX_Ok );
}
/*---------------------------------------------------------------------
Function: ADLIBFX_SetTotalVolume
Sets the total volume of the sound effect.
---------------------------------------------------------------------*/
int ADLIBFX_SetTotalVolume
(
int volume
)
{
volume = max( volume, 0 );
volume = min( volume, ADLIBFX_MaxVolume );
ADLIBFX_TotalVolume = volume;
ADLIBFX_SetVolume( ADLIBFX_VoiceHandle, ADLIBFX_SoundVolume );
return( ADLIBFX_Ok );
}
/*---------------------------------------------------------------------
Function: ADLIBFX_GetTotalVolume
Returns the total volume of the sound effect.
---------------------------------------------------------------------*/
int ADLIBFX_GetTotalVolume
(
void
)
{
return( ADLIBFX_TotalVolume );
}
/*---------------------------------------------------------------------
Function: ADLIBFX_VoiceAvailable
Checks if a voice can be play at the specified priority.
---------------------------------------------------------------------*/
int ADLIBFX_VoiceAvailable
(
int priority
)
{
if ( priority < ADLIBFX_Priority )
{
return( FALSE );
}
return( TRUE );
}
/*---------------------------------------------------------------------
Function: ADLIBFX_Play
Starts playback of a Muse sound effect.
---------------------------------------------------------------------*/
int ADLIBFX_Play
(
ALSound *sound,
int volume,
int priority,
unsigned long callbackval
)
{
unsigned flags;
int carrierlevel;
if ( priority < ADLIBFX_Priority )
{
ADLIBFX_SetErrorCode( ADLIBFX_NoVoices );
return( ADLIBFX_Warning );
}
ADLIBFX_Stop( ADLIBFX_VoiceHandle );
ADLIBFX_VoiceHandle++;
if ( ADLIBFX_VoiceHandle < ADLIBFX_MinVoiceHandle )
{
ADLIBFX_VoiceHandle = ADLIBFX_MinVoiceHandle;
}
flags = DisableInterrupts();
ADLIBFX_LengthLeft = sound->length;
ADLIBFX_Priority = priority;
ADLIBFX_Sound = sound;
ADLIBFX_SoundPtr = &sound->data;
ADLIBFX_CallBackVal = callbackval;
ADLIBFX_Block = ( ( sound->block & 7 ) << 2 ) | 0x20;
volume = min( volume, ADLIBFX_MaxVolume );
volume = max( volume, 0 );
ADLIBFX_SoundVolume = volume;
volume *= ADLIBFX_TotalVolume;
volume /= ADLIBFX_MaxVolume;
carrierlevel = sound->cScale & 0x3f;
carrierlevel ^= 0x3f;
carrierlevel *= ( volume / 2 ) + 0x80;
carrierlevel /= ADLIBFX_MaxVolume;
carrierlevel ^= 0x3f;
carrierlevel |= sound->cScale & 0xc0;
ADLIBFX_SendOutput( 0x20, sound->mChar );
ADLIBFX_SendOutput( 0x40, sound->mScale );
ADLIBFX_SendOutput( 0x60, sound->mAttack );
ADLIBFX_SendOutput( 0x80, sound->mSus );
ADLIBFX_SendOutput( 0xe0, sound->mWave );
ADLIBFX_SendOutput( 0x23, sound->cChar );
ADLIBFX_SendOutput( 0x43, carrierlevel );
ADLIBFX_SendOutput( 0x63, sound->cAttack );
ADLIBFX_SendOutput( 0x83, sound->cSus );
ADLIBFX_SendOutput( 0xe3, sound->cWave );
ADLIBFX_SendOutput( 0xc0, 0 );
RestoreInterrupts( flags );
return( ADLIBFX_VoiceHandle );
}
/*---------------------------------------------------------------------
Function: ADLIBFX_SoundPlaying
Checks if a sound effect is currently playing.
---------------------------------------------------------------------*/
int ADLIBFX_SoundPlaying
(
int handle
)
{
int status;
status = FALSE;
if ( ( handle == ADLIBFX_VoiceHandle ) && ( ADLIBFX_LengthLeft > 0 ) )
{
status = TRUE;
}
return( status );
}
/*---------------------------------------------------------------------
Function: ADLIBFX_LockEnd
Used for determining the length of the functions to lock in memory.
---------------------------------------------------------------------*/
static void ADLIBFX_LockEnd
(
void
)
{
}
/*---------------------------------------------------------------------
Function: ADLIBFX_SetCallBack
Set the function to call when a voice stops.
---------------------------------------------------------------------*/
void ADLIBFX_SetCallBack
(
void ( *function )( unsigned long )
)
{
ADLIBFX_CallBackFunc = function;
}
/*---------------------------------------------------------------------
Function: ADLIBFX_Init
Initializes the sound effect engine.
---------------------------------------------------------------------*/
int ADLIBFX_Init
(
void
)
{
int status;
if ( ADLIBFX_Installed )
{
ADLIBFX_Shutdown();
}
status = DPMI_LockMemoryRegion( ADLIBFX_LockStart, ADLIBFX_LockEnd );
status |= DPMI_Lock( ADLIBFX_VoiceHandle );
status |= DPMI_Lock( ADLIBFX_Sound );
status |= DPMI_Lock( ADLIBFX_ErrorCode );
status |= DPMI_Lock( ADLIBFX_SoundPtr );
status |= DPMI_Lock( ADLIBFX_LengthLeft );
status |= DPMI_Lock( ADLIBFX_Priority );
status |= DPMI_Lock( ADLIBFX_CallBackFunc );
status |= DPMI_Lock( ADLIBFX_Block );
if ( status != DPMI_Ok )
{
ADLIBFX_SetErrorCode( ADLIBFX_DPMI_Error );
return( ADLIBFX_Error );
}
//JIM
// AL_ReserveVoice( 0 );
ADLIBFX_Stop( ADLIBFX_VoiceHandle );
ADLIBFX_ServiceTask = TS_ScheduleTask( &ADLIBFX_Service, 140, 2, NULL );
TS_Dispatch();
ADLIBFX_Installed = TRUE;
ADLIBFX_CallBackFunc = NULL;
ADLIBFX_SetErrorCode( ADLIBFX_Ok );
return( ADLIBFX_Ok );
}
/*---------------------------------------------------------------------
Function: ADLIBFX_Shutdown
Ends the use of the sound effect engine.
---------------------------------------------------------------------*/
int ADLIBFX_Shutdown
(
void
)
{
if ( ADLIBFX_Installed )
{
ADLIBFX_Stop( ADLIBFX_VoiceHandle );
TS_Terminate( ADLIBFX_ServiceTask );
ADLIBFX_ServiceTask = NULL;
//JIM
// AL_ReleaseVoice( 0 );
ADLIBFX_Installed = FALSE;
DPMI_UnlockMemoryRegion( ADLIBFX_LockStart, ADLIBFX_LockEnd );
DPMI_Unlock( ADLIBFX_VoiceHandle );
DPMI_Unlock( ADLIBFX_Sound );
DPMI_Unlock( ADLIBFX_ErrorCode );
DPMI_Unlock( ADLIBFX_SoundPtr );
DPMI_Unlock( ADLIBFX_LengthLeft );
DPMI_Unlock( ADLIBFX_Priority );
DPMI_Unlock( ADLIBFX_CallBackFunc );
DPMI_Unlock( ADLIBFX_Block );
}
ADLIBFX_SetErrorCode( ADLIBFX_Ok );
return( ADLIBFX_Ok );
}