ref: b5950693c004b9d2024c078b8c957c3139c5abff
dir: /Game/src/audiolib/sndscape.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: SNDSCAPE.C
author: James R. Dose
date: October 25, 1994
Low level routines to support the Ensoniq Soundscape.
(c) Copyright 1994 James R. Dose. All Rights Reserved.
**********************************************************************/
#include <dos.h>
#include <conio.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <time.h>
#include "interrup.h"
#include "dpmi.h"
#include "dma.h"
#include "irq.h"
#include "sndscape.h"
#include "_sndscap.h"
const int SOUNDSCAPE_Interrupts[ SOUNDSCAPE_MaxIrq + 1 ] =
{
INVALID, INVALID, 0xa, INVALID,
INVALID, 0xd, INVALID, 0xf,
INVALID, INVALID, 0x72, INVALID,
INVALID, INVALID, INVALID, INVALID
};
const int SOUNDSCAPE_SampleSize[ SOUNDSCAPE_MaxMixMode + 1 ] =
{
MONO_8BIT_SAMPLE_SIZE, STEREO_8BIT_SAMPLE_SIZE,
MONO_16BIT_SAMPLE_SIZE, STEREO_16BIT_SAMPLE_SIZE
};
static void ( __interrupt __far *SOUNDSCAPE_OldInt )( void );
static int SOUNDSCAPE_Installed = FALSE;
static int SOUNDSCAPE_FoundCard = FALSE;
static char *SOUNDSCAPE_DMABuffer;
static char *SOUNDSCAPE_DMABufferEnd;
static char *SOUNDSCAPE_CurrentDMABuffer;
static int SOUNDSCAPE_TotalDMABufferSize;
static int SOUNDSCAPE_TransferLength = 0;
static int SOUNDSCAPE_MixMode = SOUNDSCAPE_DefaultMixMode;
static int SOUNDSCAPE_SamplePacketSize = MONO_16BIT_SAMPLE_SIZE;
static unsigned SOUNDSCAPE_SampleRate = SOUNDSCAPE_DefaultSampleRate;
volatile int SOUNDSCAPE_SoundPlaying;
void ( *SOUNDSCAPE_CallBack )( void );
static int SOUNDSCAPE_IntController1Mask;
static int SOUNDSCAPE_IntController2Mask;
// some globals for chip type, ports, DMA, IRQs ... and stuff
static struct
{
int BasePort; // base address of the Ensoniq gate-array chip
int WavePort; // the AD-1848 base address
int DMAChan; // the DMA channel used for PCM
int WaveIRQ; // the PCM IRQ
int MIDIIRQ; // the MPU-401 IRQ
int ChipID; // the Ensoniq chip type
int SBEmul; // SoundBlaster emulation flag
int CDROM; // CD-ROM flag
int IRQIndx; // the Wave IRQ index - for hardware regs
int OldIRQs; // Old IRQs flag to support older HW
} SOUNDSCAPE_Config;
// adequate stack size
#define kStackSize 2048
static unsigned short StackSelector = NULL;
static unsigned long StackPointer;
static unsigned short oldStackSelector;
static unsigned long oldStackPointer;
// These declarations are necessary to use the inline assembly pragmas.
extern void GetStack(unsigned short *selptr,unsigned long *stackptr);
extern void SetStack(unsigned short selector,unsigned long stackptr);
// This function will get the current stack selector and pointer and save
// them off.
#pragma aux GetStack = \
"mov [edi],esp" \
"mov ax,ss" \
"mov [esi],ax" \
parm [esi] [edi] \
modify [eax esi edi];
// This function will set the stack selector and pointer to the specified
// values.
#pragma aux SetStack = \
"mov ss,ax" \
"mov esp,edx" \
parm [ax] [edx] \
modify [eax edx];
int SOUNDSCAPE_DMAChannel = -1;
int SOUNDSCAPE_ErrorCode = SOUNDSCAPE_Ok;
#define SOUNDSCAPE_SetErrorCode( status ) \
SOUNDSCAPE_ErrorCode = ( status );
/*---------------------------------------------------------------------
Function: SOUNDSCAPE_ErrorString
Returns a pointer to the error message associated with an error
number. A -1 returns a pointer the current error.
---------------------------------------------------------------------*/
char *SOUNDSCAPE_ErrorString
(
int ErrorNumber
)
{
char *ErrorString;
switch( ErrorNumber )
{
case SOUNDSCAPE_Warning :
case SOUNDSCAPE_Error :
ErrorString = SOUNDSCAPE_ErrorString( SOUNDSCAPE_ErrorCode );
break;
case SOUNDSCAPE_Ok :
ErrorString = "SoundScape ok.";
break;
case SOUNDSCAPE_EnvNotFound :
ErrorString = "SNDSCAPE environment variable not set. This is used to locate \n"
"SNDSCAPE.INI which is used to describe your sound card setup.";
break;
case SOUNDSCAPE_InitFileNotFound :
ErrorString = "Missing SNDSCAPE.INI file for SoundScape. This file should be \n"
"located in the directory indicated by the SNDSCAPE environment \n"
"variable or in 'C:\SNDSCAPE' if SNDSCAPE is not set.";
break;
case SOUNDSCAPE_MissingProductInfo :
ErrorString = "Missing 'Product' field in SNDSCAPE.INI file for SoundScape.";
break;
case SOUNDSCAPE_MissingPortInfo :
ErrorString = "Missing 'Port' field in SNDSCAPE.INI file for SoundScape.";
break;
case SOUNDSCAPE_MissingDMAInfo :
ErrorString = "Missing 'DMA' field in SNDSCAPE.INI file for SoundScape.";
break;
case SOUNDSCAPE_MissingIRQInfo :
ErrorString = "Missing 'IRQ' field in SNDSCAPE.INI file for SoundScape.";
break;
case SOUNDSCAPE_MissingSBIRQInfo :
ErrorString = "Missing 'SBIRQ' field in SNDSCAPE.INI file for SoundScape.";
break;
case SOUNDSCAPE_MissingSBENABLEInfo :
ErrorString = "Missing 'SBEnable' field in SNDSCAPE.INI file for SoundScape.";
break;
case SOUNDSCAPE_MissingWavePortInfo :
ErrorString = "Missing 'WavePort' field in SNDSCAPE.INI file for SoundScape.";
break;
case SOUNDSCAPE_HardwareError :
ErrorString = "Could not detect SoundScape. Make sure your SNDSCAPE.INI file \n"
"contains correct information about your hardware setup.";
break;
case SOUNDSCAPE_NoSoundPlaying :
ErrorString = "No sound playing on SoundScape.";
break;
case SOUNDSCAPE_InvalidSBIrq :
ErrorString = "Invalid SoundScape Irq in SBIRQ field of SNDSCAPE.INI.";
break;
case SOUNDSCAPE_UnableToSetIrq :
ErrorString = "Unable to set SoundScape IRQ. Try selecting an IRQ of 7 or below.";
break;
case SOUNDSCAPE_DmaError :
ErrorString = DMA_ErrorString( DMA_Error );
break;
case SOUNDSCAPE_DPMI_Error :
ErrorString = "DPMI Error in SoundScape.";
break;
case SOUNDSCAPE_OutOfMemory :
ErrorString = "Out of conventional memory in SoundScape.";
break;
default :
ErrorString = "Unknown SoundScape error code.";
break;
}
return( ErrorString );
}
/**********************************************************************
Memory locked functions:
**********************************************************************/
#define SOUNDSCAPE_LockStart SOUNDSCAPE_EnableInterrupt
/*---------------------------------------------------------------------
Function: SOUNDSCAPE_EnableInterrupt
Enables the triggering of the sound card interrupt.
---------------------------------------------------------------------*/
static void SOUNDSCAPE_EnableInterrupt
(
void
)
{
int mask;
// Unmask system interrupt
if ( SOUNDSCAPE_Config.WaveIRQ < 8 )
{
mask = inp( 0x21 ) & ~( 1 << SOUNDSCAPE_Config.WaveIRQ );
outp( 0x21, mask );
}
else
{
mask = inp( 0xA1 ) & ~( 1 << ( SOUNDSCAPE_Config.WaveIRQ - 8 ) );
outp( 0xA1, mask );
mask = inp( 0x21 ) & ~( 1 << 2 );
outp( 0x21, mask );
}
}
/*---------------------------------------------------------------------
Function: SOUNDSCAPE_DisableInterrupt
Disables the triggering of the sound card interrupt.
---------------------------------------------------------------------*/
static void SOUNDSCAPE_DisableInterrupt
(
void
)
{
int mask;
// Restore interrupt mask
if ( SOUNDSCAPE_Config.WaveIRQ < 8 )
{
mask = inp( 0x21 ) & ~( 1 << SOUNDSCAPE_Config.WaveIRQ );
mask |= SOUNDSCAPE_IntController1Mask & ( 1 << SOUNDSCAPE_Config.WaveIRQ );
outp( 0x21, mask );
}
else
{
mask = inp( 0x21 ) & ~( 1 << 2 );
mask |= SOUNDSCAPE_IntController1Mask & ( 1 << 2 );
outp( 0x21, mask );
mask = inp( 0xA1 ) & ~( 1 << ( SOUNDSCAPE_Config.WaveIRQ - 8 ) );
mask |= SOUNDSCAPE_IntController2Mask & ( 1 << ( SOUNDSCAPE_Config.WaveIRQ - 8 ) );
outp( 0xA1, mask );
}
}
/*---------------------------------------------------------------------
Function: SOUNDSCAPE_ServiceInterrupt
Handles interrupt generated by sound card at the end of a voice
transfer. Calls the user supplied callback function.
---------------------------------------------------------------------*/
static void __interrupt __far SOUNDSCAPE_ServiceInterrupt
(
void
)
{
// save stack
GetStack( &oldStackSelector, &oldStackPointer );
// set our stack
SetStack( StackSelector, StackPointer );
if ( !( inp( SOUNDSCAPE_Config.WavePort + AD_STATUS ) & 0x01 ) )
{
// restore stack
SetStack( oldStackSelector, oldStackPointer );
// Wasn't our interrupt. Call the old one.
_chain_intr( SOUNDSCAPE_OldInt );
}
// clear the AD-1848 interrupt
outp( SOUNDSCAPE_Config.WavePort + AD_STATUS, 0x00 );
// Keep track of current buffer
SOUNDSCAPE_CurrentDMABuffer += SOUNDSCAPE_TransferLength;
if ( SOUNDSCAPE_CurrentDMABuffer >= SOUNDSCAPE_DMABufferEnd )
{
SOUNDSCAPE_CurrentDMABuffer = SOUNDSCAPE_DMABuffer;
}
// Call the caller's callback function
if ( SOUNDSCAPE_CallBack != NULL )
{
SOUNDSCAPE_CallBack();
}
// restore stack
SetStack( oldStackSelector, oldStackPointer );
// send EOI to Interrupt Controller
if ( SOUNDSCAPE_Config.WaveIRQ > 7 )
{
outp( 0xA0, 0x20 );
}
outp( 0x20, 0x20 );
}
/*---------------------------------------------------------------------
Function: ga_read
Reads Ensoniq indirect registers.
---------------------------------------------------------------------*/
static int ga_read
(
int rnum
)
{
int data;
outp( SOUNDSCAPE_Config.BasePort + GA_REGADDR, rnum );
data = inp( SOUNDSCAPE_Config.BasePort + GA_REGDATA );
return( data );
}
/*---------------------------------------------------------------------
Function: ga_write
Writes to Ensoniq indirect registers.
---------------------------------------------------------------------*/
static void ga_write
(
int rnum,
int value
)
{
outp( SOUNDSCAPE_Config.BasePort + GA_REGADDR, rnum );
outp( SOUNDSCAPE_Config.BasePort + GA_REGDATA, value );
}
/*---------------------------------------------------------------------
Function: ad_read
Reads the AD-1848 indirect registers. This function should not be
used while the AD-1848 mode change is enabled
---------------------------------------------------------------------*/
static int ad_read
(
int rnum
)
{
int data;
outp( SOUNDSCAPE_Config.WavePort + AD_REGADDR, rnum );
data = inp( SOUNDSCAPE_Config.WavePort + AD_REGDATA );
return( data );
}
/*---------------------------------------------------------------------
Function: ad_write
Writes to the AD-1848 indirect registers. This function should
not be used while the AD-1848 mode change is enabled.
---------------------------------------------------------------------*/
static void ad_write
(
int rnum,
int value
)
{
outp( SOUNDSCAPE_Config.WavePort + AD_REGADDR, rnum );
outp( SOUNDSCAPE_Config.WavePort + AD_REGDATA, value );
}
/*---------------------------------------------------------------------
Function: tdelay
Delay function - 250ms - for AD-1848 re-synch and autocalibration.
---------------------------------------------------------------------*/
static void tdelay
(
void
)
{
long time;
unsigned flags;
flags = DisableInterrupts();
_enable();
time = clock() + CLOCKS_PER_SEC/4;
while(clock() < time)
;
RestoreInterrupts( flags );
}
/*---------------------------------------------------------------------
Function: pcm_format
Sets the PCM data format.
---------------------------------------------------------------------*/
static void pcm_format
(
void
)
{
int format;
// build the register value based on format
format = 0;
switch( SOUNDSCAPE_SampleRate )
{
case 11025:
format = 0x03;
break;
case 22050:
format = 0x07;
break;
case 44100:
format = 0x0b;
break;
default:
// Set it to 11025 hz
format = 0x03;
break;
}
// set other format bits and format globals
if ( SOUNDSCAPE_MixMode & SIXTEEN_BIT )
{
format |= 0x40;
}
if ( SOUNDSCAPE_MixMode & STEREO )
{
format |= 0x10;
}
// enable mode change, point to format reg
outp( SOUNDSCAPE_Config.WavePort + AD_REGADDR, 0x40 | AD_FORMAT );
// write the format
outp( SOUNDSCAPE_Config.WavePort + AD_REGDATA, format );
// delay for internal re-synch
tdelay();
// exit mode change state
outp( SOUNDSCAPE_Config.WavePort + AD_REGADDR, 0x00 );
// delay for autocalibration
tdelay();
}
/*---------------------------------------------------------------------
Function: SOUNDSCAPE_SetPlaybackRate
Sets the rate at which the digitized sound will be played in
hertz.
---------------------------------------------------------------------*/
void SOUNDSCAPE_SetPlaybackRate
(
unsigned rate
)
{
if ( rate < 20000 )
{
rate = 11025;
}
else if ( rate < 30000 )
{
rate = 22050;
}
else
{
rate = 44100;
}
SOUNDSCAPE_SampleRate = rate;
// Set the rate
pcm_format();
}
/*---------------------------------------------------------------------
Function: SOUNDSCAPE_GetPlaybackRate
Returns the rate at which the digitized sound will be played in
hertz.
---------------------------------------------------------------------*/
unsigned SOUNDSCAPE_GetPlaybackRate
(
void
)
{
return( SOUNDSCAPE_SampleRate );
}
/*---------------------------------------------------------------------
Function: SOUNDSCAPE_SetMixMode
Sets the sound card to play samples in mono or stereo.
---------------------------------------------------------------------*/
int SOUNDSCAPE_SetMixMode
(
int mode
)
{
SOUNDSCAPE_MixMode = mode & SOUNDSCAPE_MaxMixMode;
SOUNDSCAPE_SamplePacketSize = SOUNDSCAPE_SampleSize[ SOUNDSCAPE_MixMode ];
// Set the mixmode
pcm_format();
return( mode );
}
/*---------------------------------------------------------------------
Function: SOUNDSCAPE_StopPlayback
Ends the DMA transfer of digitized sound to the sound card.
---------------------------------------------------------------------*/
void SOUNDSCAPE_StopPlayback
(
void
)
{
// Don't allow anymore interrupts
SOUNDSCAPE_DisableInterrupt();
/* stop the AD-1848 */
ad_write( AD_CONFIG, 0x00 );
/* let it finish it's cycles */
tdelay();
// Disable the DMA channel
DMA_EndTransfer( SOUNDSCAPE_Config.DMAChan );
SOUNDSCAPE_SoundPlaying = FALSE;
SOUNDSCAPE_DMABuffer = NULL;
}
/*---------------------------------------------------------------------
Function: SOUNDSCAPE_SetupDMABuffer
Programs the DMAC for sound transfer.
---------------------------------------------------------------------*/
static int SOUNDSCAPE_SetupDMABuffer
(
char *BufferPtr,
int BufferSize,
int mode
)
{
int DmaStatus;
DmaStatus = DMA_SetupTransfer( SOUNDSCAPE_Config.DMAChan, BufferPtr, BufferSize, mode );
if ( DmaStatus == DMA_Error )
{
SOUNDSCAPE_SetErrorCode( SOUNDSCAPE_DmaError );
return( SOUNDSCAPE_Error );
}
SOUNDSCAPE_DMAChannel = SOUNDSCAPE_Config.DMAChan;
SOUNDSCAPE_DMABuffer = BufferPtr;
SOUNDSCAPE_CurrentDMABuffer = BufferPtr;
SOUNDSCAPE_TotalDMABufferSize = BufferSize;
SOUNDSCAPE_DMABufferEnd = BufferPtr + BufferSize;
return( SOUNDSCAPE_Ok );
}
/*---------------------------------------------------------------------
Function: SOUNDSCAPE_GetCurrentPos
Returns the offset within the current sound being played.
---------------------------------------------------------------------*/
int SOUNDSCAPE_GetCurrentPos
(
void
)
{
char *CurrentAddr;
int offset;
if ( !SOUNDSCAPE_SoundPlaying )
{
SOUNDSCAPE_SetErrorCode( SOUNDSCAPE_NoSoundPlaying );
return( SOUNDSCAPE_Error );
}
CurrentAddr = DMA_GetCurrentPos( SOUNDSCAPE_Config.DMAChan );
offset = ( int )( ( ( unsigned long )CurrentAddr ) -
( ( unsigned long )SOUNDSCAPE_CurrentDMABuffer ) );
if ( SOUNDSCAPE_MixMode & SIXTEEN_BIT )
{
offset >>= 1;
}
if ( SOUNDSCAPE_MixMode & STEREO )
{
offset >>= 1;
}
return( offset );
}
/*---------------------------------------------------------------------
Function: SOUNDSCAPE_BeginPlayback
Starts playback of digitized sound.
---------------------------------------------------------------------*/
static int SOUNDSCAPE_BeginPlayback
(
int length
)
{
int SampleLength;
int LoByte;
int HiByte;
if ( SOUNDSCAPE_MixMode & SIXTEEN_BIT )
{
SampleLength = length / 2;
}
else
{
SampleLength = length;
}
if ( SOUNDSCAPE_MixMode & STEREO )
{
SampleLength >>= 1;
}
SampleLength--;
// setup the AD-1848 interrupt count
// set the interrupt count value based on the format.
// count will decrement every sample period and generate
// an interrupt when in rolls over. we want this always
// to be at every 1/2 buffer, regardless of the data format,
// so the count must be adjusted accordingly.
HiByte = hibyte( SampleLength );
LoByte = lobyte( SampleLength );
ad_write( AD_LCOUNT, LoByte );
ad_write( AD_UCOUNT, HiByte );
/* unmask the host DMA controller */
SOUNDSCAPE_EnableInterrupt();
/* start the AD-1848 */
ad_write(AD_CONFIG, 0x01);
SOUNDSCAPE_SoundPlaying = TRUE;
return( SOUNDSCAPE_Ok );
}
/*---------------------------------------------------------------------
Function: SOUNDSCAPE_BeginBufferedPlayback
Begins multibuffered playback of digitized sound on the sound card.
---------------------------------------------------------------------*/
int SOUNDSCAPE_BeginBufferedPlayback
(
char *BufferStart,
int BufferSize,
int NumDivisions,
unsigned SampleRate,
int MixMode,
void ( *CallBackFunc )( void )
)
{
int DmaStatus;
int TransferLength;
if ( SOUNDSCAPE_SoundPlaying )
{
SOUNDSCAPE_StopPlayback();
}
SOUNDSCAPE_SetMixMode( MixMode );
DmaStatus = SOUNDSCAPE_SetupDMABuffer( BufferStart, BufferSize,
DMA_AutoInitRead );
if ( DmaStatus == SOUNDSCAPE_Error )
{
return( SOUNDSCAPE_Error );
}
SOUNDSCAPE_SetPlaybackRate( SampleRate );
SOUNDSCAPE_SetCallBack( CallBackFunc );
SOUNDSCAPE_EnableInterrupt();
TransferLength = BufferSize / NumDivisions;
SOUNDSCAPE_TransferLength = TransferLength;
SOUNDSCAPE_BeginPlayback( TransferLength );
return( SOUNDSCAPE_Ok );
}
/*---------------------------------------------------------------------
Function: SOUNDSCAPE_GetCardInfo
Returns the maximum number of bits that can represent a sample
(8 or 16) and the number of channels (1 for mono, 2 for stereo).
---------------------------------------------------------------------*/
int SOUNDSCAPE_GetCardInfo
(
int *MaxSampleBits,
int *MaxChannels
)
{
int status;
status = SOUNDSCAPE_FindCard();
if ( status == SOUNDSCAPE_Ok )
{
*MaxChannels = 2;
*MaxSampleBits = 16;
return( SOUNDSCAPE_Ok );
}
return( status );
}
/*---------------------------------------------------------------------
Function: SOUNDSCAPE_SetCallBack
Specifies the user function to call at the end of a sound transfer.
---------------------------------------------------------------------*/
void SOUNDSCAPE_SetCallBack
(
void ( *func )( void )
)
{
SOUNDSCAPE_CallBack = func;
}
/*---------------------------------------------------------------------
Function: SOUNDSCAPE_LockEnd
Used for determining the length of the functions to lock in memory.
---------------------------------------------------------------------*/
static void SOUNDSCAPE_LockEnd
(
void
)
{
}
/*---------------------------------------------------------------------
Function: SOUNDSCAPE_UnlockMemory
Unlocks all neccessary data.
---------------------------------------------------------------------*/
static void SOUNDSCAPE_UnlockMemory
(
void
)
{
DPMI_UnlockMemoryRegion( SOUNDSCAPE_LockStart, SOUNDSCAPE_LockEnd );
DPMI_Unlock( SOUNDSCAPE_Config );
DPMI_Unlock( SOUNDSCAPE_OldInt );
DPMI_Unlock( SOUNDSCAPE_Installed );
DPMI_Unlock( SOUNDSCAPE_DMABuffer );
DPMI_Unlock( SOUNDSCAPE_DMABufferEnd );
DPMI_Unlock( SOUNDSCAPE_CurrentDMABuffer );
DPMI_Unlock( SOUNDSCAPE_TotalDMABufferSize );
DPMI_Unlock( SOUNDSCAPE_TransferLength );
DPMI_Unlock( SOUNDSCAPE_MixMode );
DPMI_Unlock( SOUNDSCAPE_SamplePacketSize );
DPMI_Unlock( SOUNDSCAPE_SampleRate );
DPMI_Unlock( SOUNDSCAPE_SoundPlaying );
DPMI_Unlock( SOUNDSCAPE_CallBack );
DPMI_Unlock( SOUNDSCAPE_IntController1Mask );
DPMI_Unlock( SOUNDSCAPE_IntController2Mask );
}
/*---------------------------------------------------------------------
Function: SOUNDSCAPE_LockMemory
Locks all neccessary data.
---------------------------------------------------------------------*/
static int SOUNDSCAPE_LockMemory
(
void
)
{
int status;
status = DPMI_LockMemoryRegion( SOUNDSCAPE_LockStart, SOUNDSCAPE_LockEnd );
status |= DPMI_Lock( SOUNDSCAPE_Config );
status |= DPMI_Lock( SOUNDSCAPE_OldInt );
status |= DPMI_Lock( SOUNDSCAPE_Installed );
status |= DPMI_Lock( SOUNDSCAPE_DMABuffer );
status |= DPMI_Lock( SOUNDSCAPE_DMABufferEnd );
status |= DPMI_Lock( SOUNDSCAPE_CurrentDMABuffer );
status |= DPMI_Lock( SOUNDSCAPE_TotalDMABufferSize );
status |= DPMI_Lock( SOUNDSCAPE_TransferLength );
status |= DPMI_Lock( SOUNDSCAPE_MixMode );
status |= DPMI_Lock( SOUNDSCAPE_SamplePacketSize );
status |= DPMI_Lock( SOUNDSCAPE_SampleRate );
status |= DPMI_Lock( SOUNDSCAPE_SoundPlaying );
status |= DPMI_Lock( SOUNDSCAPE_CallBack );
status |= DPMI_Lock( SOUNDSCAPE_IntController1Mask );
status |= DPMI_Lock( SOUNDSCAPE_IntController2Mask );
if ( status != DPMI_Ok )
{
SOUNDSCAPE_UnlockMemory();
SOUNDSCAPE_SetErrorCode( SOUNDSCAPE_DPMI_Error );
return( SOUNDSCAPE_Error );
}
return( SOUNDSCAPE_Ok );
}
/*---------------------------------------------------------------------
Function: allocateTimerStack
Allocate a block of memory from conventional (low) memory and return
the selector (which can go directly into a segment register) of the
memory block or 0 if an error occured.
---------------------------------------------------------------------*/
static unsigned short allocateTimerStack
(
unsigned short size
)
{
union REGS regs;
// clear all registers
memset( ®s, 0, sizeof( regs ) );
// DPMI allocate conventional memory
regs.w.ax = 0x100;
// size in paragraphs
regs.w.bx = ( size + 15 ) / 16;
int386( 0x31, ®s, ®s );
if (!regs.w.cflag)
{
// DPMI call returns selector in dx
// (ax contains real mode segment
// which is ignored here)
return( regs.w.dx );
}
// Couldn't allocate memory.
return( NULL );
}
/*---------------------------------------------------------------------
Function: deallocateTimerStack
Deallocate a block of conventional (low) memory given a selector to
it. Assumes the block was allocated with DPMI function 0x100.
---------------------------------------------------------------------*/
static void deallocateTimerStack
(
unsigned short selector
)
{
union REGS regs;
if ( selector != NULL )
{
// clear all registers
memset( ®s, 0, sizeof( regs ) );
regs.w.ax = 0x101;
regs.w.dx = selector;
int386( 0x31, ®s, ®s );
}
}
/*---------------------------------------------------------------------
Function: parse
Parses for the right hand string of an .INI file equate.
---------------------------------------------------------------------*/
static int parse
(
char *val,
char *str,
FILE *p1
)
{
int i;
int j;
char tmpstr[ 81 ];
rewind( p1 );
while( !feof( p1 ) )
{
// get a new string
fgets( tmpstr, 81, p1 );
if( ( tmpstr[ 0 ] == '[' ) || ( tmpstr[ 0 ] == ';' ) ||
( tmpstr[ 0 ] == '\n' ) )
{
continue;
}
// parse up to the '='
i = 0;
while( ( tmpstr[ i ] != '=' ) && ( tmpstr[ i ] != '\n' ) )
{
i++;
}
if( tmpstr[ i ] != '=' )
{
continue;
}
tmpstr[ i ] = '\0';
// see if it's the one we want
if ( strcmp( tmpstr, str ) )
{
continue;
}
// copy the right hand value to the destination string
i++;
for( j = 0; j < 32; j++ )
{
if ( ( tmpstr[ i ] == ' ' ) || ( tmpstr[ i ] == '\t' ) ||
( tmpstr[ i ] == ',' ) || ( tmpstr[ i ] == '\n' ) )
{
break;
}
val[ j ] = tmpstr[ i ];
i++;
}
val[j] = '\0';
return( TRUE );
}
return( FALSE );
}
/*---------------------------------------------------------------------
Function: SOUNDSCAPE_FindCard
Determines if a SoundScape is present and where it is located.
---------------------------------------------------------------------*/
static int SOUNDSCAPE_FindCard
(
void
)
{
int found;
int status;
int tmp;
char *cp;
char str[ 33 ];
FILE *fp;
if ( SOUNDSCAPE_FoundCard )
{
return( SOUNDSCAPE_Ok );
}
cp = getenv( "SNDSCAPE" );
if ( cp == NULL )
{
strcpy( str, "C:\\SNDSCAPE" );
}
else
{
strcpy( str, cp );
}
strcat(str, "\\SNDSCAPE.INI");
fp = fopen( str, "r" );
if ( fp == NULL )
{
if ( cp == NULL )
{
SOUNDSCAPE_SetErrorCode( SOUNDSCAPE_EnvNotFound );
return( SOUNDSCAPE_Error );
}
SOUNDSCAPE_SetErrorCode( SOUNDSCAPE_InitFileNotFound );
return( SOUNDSCAPE_Error );
}
found = parse( str, "Product", fp );
if ( !found )
{
fclose( fp );
SOUNDSCAPE_SetErrorCode( SOUNDSCAPE_MissingProductInfo );
return( SOUNDSCAPE_Error );
}
if( strstr( str, "SoundFX" ) == NULL )
{
SOUNDSCAPE_Config.OldIRQs = FALSE;
}
else
{
SOUNDSCAPE_Config.OldIRQs = TRUE;
}
found = parse( str, "Port", fp );
if ( !found )
{
fclose( fp );
SOUNDSCAPE_SetErrorCode( SOUNDSCAPE_MissingPortInfo );
return( SOUNDSCAPE_Error );
}
SOUNDSCAPE_Config.BasePort = strtol( str, ( char ** )0, 16);
found = parse( str, "DMA", fp );
if ( !found )
{
fclose( fp );
SOUNDSCAPE_SetErrorCode( SOUNDSCAPE_MissingDMAInfo );
return( SOUNDSCAPE_Error );
}
SOUNDSCAPE_Config.DMAChan = ( int )strtol( str, ( char ** )0, 10 );
status = DMA_VerifyChannel( SOUNDSCAPE_Config.DMAChan );
if ( status == DMA_Error )
{
fclose( fp );
SOUNDSCAPE_SetErrorCode( SOUNDSCAPE_DmaError );
return( SOUNDSCAPE_Error );
}
found = parse( str, "IRQ", fp );
if ( !found )
{
fclose( fp );
SOUNDSCAPE_SetErrorCode( SOUNDSCAPE_MissingIRQInfo );
return( SOUNDSCAPE_Error );
}
SOUNDSCAPE_Config.MIDIIRQ = ( int )strtol( str, ( char ** )0, 10 );
if ( SOUNDSCAPE_Config.MIDIIRQ == 2 )
{
SOUNDSCAPE_Config.MIDIIRQ = 9;
}
found = parse( str, "SBIRQ", fp );
if ( !found )
{
fclose( fp );
SOUNDSCAPE_SetErrorCode( SOUNDSCAPE_MissingSBIRQInfo );
return( SOUNDSCAPE_Error );
}
SOUNDSCAPE_Config.WaveIRQ = ( int )strtol( str, ( char ** )0, 10 );
if ( SOUNDSCAPE_Config.WaveIRQ == 2 )
{
SOUNDSCAPE_Config.WaveIRQ = 9;
}
if ( !VALID_IRQ( SOUNDSCAPE_Config.WaveIRQ ) )
{
fclose( fp );
SOUNDSCAPE_SetErrorCode( SOUNDSCAPE_InvalidSBIrq );
return( SOUNDSCAPE_Error );
}
if ( SOUNDSCAPE_Interrupts[ SOUNDSCAPE_Config.WaveIRQ ] == INVALID )
{
fclose( fp );
SOUNDSCAPE_SetErrorCode( SOUNDSCAPE_InvalidSBIrq );
return( SOUNDSCAPE_Error );
}
found = parse( str, "SBEnable", fp );
if ( !found )
{
fclose( fp );
SOUNDSCAPE_SetErrorCode( SOUNDSCAPE_MissingSBENABLEInfo );
return( SOUNDSCAPE_Error );
}
if( !strcmp( str, "false" ) )
{
SOUNDSCAPE_Config.SBEmul = FALSE;
}
else
{
SOUNDSCAPE_Config.SBEmul = TRUE;
}
// do a hardware test
outp( SOUNDSCAPE_Config.BasePort + GA_REGADDR, 0x00f5 );
tmp = inp( SOUNDSCAPE_Config.BasePort + GA_REGADDR );
if ( ( tmp & 0x000f ) != 0x0005 )
{
fclose( fp );
SOUNDSCAPE_SetErrorCode( SOUNDSCAPE_HardwareError );
return( SOUNDSCAPE_Error );
}
if( ( tmp & 0x00f0 ) == 0x00f0 )
{
fclose( fp );
SOUNDSCAPE_SetErrorCode( SOUNDSCAPE_HardwareError );
return( SOUNDSCAPE_Error );
}
// formulate the chip ID
tmp >>= 4;
if( tmp == 0 )
{
SOUNDSCAPE_Config.ChipID = ODIE;
}
else if ( !( tmp & 0x0008 ) )
{
SOUNDSCAPE_Config.ChipID = OPUS;
}
else
{
SOUNDSCAPE_Config.ChipID = MMIC;
}
// parse for the AD-1848 address if necessary
if( SOUNDSCAPE_Config.ChipID == ODIE )
{
found = parse( str, "WavePort", fp );
if ( !found )
{
fclose( fp );
SOUNDSCAPE_SetErrorCode( SOUNDSCAPE_MissingWavePortInfo );
return( SOUNDSCAPE_Error );
}
SOUNDSCAPE_Config.WavePort = strtol( str, ( char ** )0, 16 );
}
else
{
// otherwise, the base address is fixed
SOUNDSCAPE_Config.WavePort = SOUNDSCAPE_Config.BasePort + AD_OFFSET;
}
// we're done with the file
fclose( fp );
// if it's an ODIE board, note CD-ROM decode enable
if ( SOUNDSCAPE_Config.ChipID == ODIE )
{
SOUNDSCAPE_Config.CDROM = ga_read( GA_CDCFG ) & 0x80;
}
// build the Wave IRQ index value
if( !SOUNDSCAPE_Config.OldIRQs )
{
switch( SOUNDSCAPE_Config.WaveIRQ )
{
case 9 :
SOUNDSCAPE_Config.IRQIndx = 0;
break;
case 5 :
SOUNDSCAPE_Config.IRQIndx = 1;
break;
case 7 :
SOUNDSCAPE_Config.IRQIndx = 2;
break;
default :
SOUNDSCAPE_Config.IRQIndx = 3;
break;
}
}
else
{
switch( SOUNDSCAPE_Config.WaveIRQ )
{
case 9 :
SOUNDSCAPE_Config.IRQIndx = 0;
break;
case 5 :
SOUNDSCAPE_Config.IRQIndx = 2;
break;
case 7 :
SOUNDSCAPE_Config.IRQIndx = 1;
break;
default :
SOUNDSCAPE_Config.IRQIndx = 3;
break;
}
}
SOUNDSCAPE_FoundCard = TRUE;
SOUNDSCAPE_SetErrorCode( SOUNDSCAPE_Ok );
return( SOUNDSCAPE_Ok );
}
/*---------------------------------------------------------------------
Function: SOUNDSCAPE_Setup
Setup the Soundscape card for native mode PCM.
---------------------------------------------------------------------*/
static int SOUNDSCAPE_Setup
(
void
)
{
int tmp;
int Interrupt;
int status;
// if necessary, clear any pending SB ints
if ( SOUNDSCAPE_Config.SBEmul )
{
inp( SB_IACK );
}
SOUNDSCAPE_DisableInterrupt();
// make sure the AD-1848 is not running
if ( ad_read( AD_CONFIG ) & 0x01 )
{
SOUNDSCAPE_StopPlayback();
}
// if necessary, do some signal re-routing
if( SOUNDSCAPE_Config.ChipID != MMIC )
{
// get the gate-array off of the DMA channel
ga_write( GA_DMACHB, 0x20 );
if ( !SOUNDSCAPE_Config.OldIRQs )
{
switch( SOUNDSCAPE_Config.MIDIIRQ )
{
case 5 :
tmp = 1;
break;
case 7 :
tmp = 2;
break;
case 9 :
tmp = 0;
break;
default :
tmp = 3;
break;
}
}
else
{
switch( SOUNDSCAPE_Config.MIDIIRQ )
{
case 5 :
tmp = 2;
break;
case 7 :
tmp = 1;
break;
case 9 :
tmp = 0;
break;
default :
tmp = 3;
break;
}
}
// set HostIRQ to MIDIIRQ for now
ga_write( GA_INTCFG, 0xf0 | ( tmp << 2 ) | tmp );
// now, route the AD-1848 stuff ...
if ( SOUNDSCAPE_Config.ChipID == OPUS )
{
// set the AD-1848 chip decode
ga_write( GA_HMCTL, ( ga_read( GA_HMCTL ) & 0xcf ) | 0x10 );
}
// setup the DMA polarity
ga_write( GA_DMACFG, 0x50 );
// init the CD-ROM (AD-1848) config register
ga_write( GA_CDCFG, 0x89 | ( SOUNDSCAPE_Config.DMAChan << 4 ) | ( SOUNDSCAPE_Config.IRQIndx << 1 ) );
// enable mode change, point to config reg
outp( SOUNDSCAPE_Config.WavePort + AD_REGADDR, 0x40 | AD_CONFIG );
// set interf cnfg reg for DMA mode, single chan, autocal on
outp( SOUNDSCAPE_Config.WavePort + AD_REGDATA, 0x0c );
// exit mode change state
outp( SOUNDSCAPE_Config.WavePort + AD_REGADDR, 0x00 );
// delay for autocalibration
tdelay();
}
// Install our interrupt handler
Interrupt = SOUNDSCAPE_Interrupts[ SOUNDSCAPE_Config.WaveIRQ ];
SOUNDSCAPE_OldInt = _dos_getvect( Interrupt );
if ( SOUNDSCAPE_Config.WaveIRQ < 8 )
{
_dos_setvect( Interrupt, SOUNDSCAPE_ServiceInterrupt );
}
else
{
status = IRQ_SetVector( Interrupt, SOUNDSCAPE_ServiceInterrupt );
if ( status != IRQ_Ok )
{
SOUNDSCAPE_SetErrorCode( SOUNDSCAPE_UnableToSetIrq );
return( SOUNDSCAPE_Error );
}
}
// max left and right volumes
ad_write( AD_LEFTOUT, 0 );
ad_write( AD_RIGHTOUT, 0 );
// clear any pending interrupt condition
outp( SOUNDSCAPE_Config.WavePort + AD_STATUS, 0x00 );
// enable the interrupt pin
ad_write( AD_PINCTRL, ad_read( AD_PINCTRL ) | 0x02 );
SOUNDSCAPE_EnableInterrupt();
SOUNDSCAPE_SetErrorCode( SOUNDSCAPE_Ok );
return( SOUNDSCAPE_Ok );
}
/*---------------------------------------------------------------------
Function: SOUNDSCAPE_GetMIDIPort
Gets the address of the SoundScape MIDI port.
---------------------------------------------------------------------*/
int SOUNDSCAPE_GetMIDIPort
(
void
)
{
int status;
status = SOUNDSCAPE_FindCard();
if ( status != SOUNDSCAPE_Ok )
{
return( status );
}
return( SOUNDSCAPE_Config.BasePort );
}
/*---------------------------------------------------------------------
Function: SOUNDSCAPE_Init
Initializes the sound card and prepares the module to play
digitized sounds.
---------------------------------------------------------------------*/
int SOUNDSCAPE_Init
(
void
)
{
int status;
if ( SOUNDSCAPE_Installed )
{
SOUNDSCAPE_Shutdown();
}
// Save the interrupt masks
SOUNDSCAPE_IntController1Mask = inp( 0x21 );
SOUNDSCAPE_IntController2Mask = inp( 0xA1 );
SOUNDSCAPE_SoundPlaying = FALSE;
SOUNDSCAPE_SetCallBack( NULL );
SOUNDSCAPE_DMABuffer = NULL;
status = SOUNDSCAPE_FindCard();
if ( status != SOUNDSCAPE_Ok )
{
return( status );
}
status = SOUNDSCAPE_LockMemory();
if ( status != SOUNDSCAPE_Ok )
{
SOUNDSCAPE_UnlockMemory();
return( status );
}
StackSelector = allocateTimerStack( kStackSize );
if ( StackSelector == NULL )
{
SOUNDSCAPE_UnlockMemory();
SOUNDSCAPE_SetErrorCode( SOUNDSCAPE_OutOfMemory );
return( SOUNDSCAPE_Error );
}
// Leave a little room at top of stack just for the hell of it...
StackPointer = kStackSize - sizeof( long );
SOUNDSCAPE_Installed = TRUE;
status = SOUNDSCAPE_Setup();
if ( status != SOUNDSCAPE_Ok )
{
SOUNDSCAPE_Shutdown();
return( status );
}
// printf("Testing DMA and IRQ ...\n");
// if( test_dma_irq() )
// {
// printf("\t\007Hardware Not Responding\n\n");
// close_soundscape();
// return( SOUNDSCAPE_Error );
// }
SOUNDSCAPE_SetPlaybackRate( SOUNDSCAPE_DefaultSampleRate );
SOUNDSCAPE_SetMixMode( SOUNDSCAPE_DefaultMixMode );
SOUNDSCAPE_SetErrorCode( SOUNDSCAPE_Ok );
return( SOUNDSCAPE_Ok );
}
/*---------------------------------------------------------------------
Function: SOUNDSCAPE_Shutdown
Ends transfer of sound data to the sound card and restores the
system resources used by the card.
---------------------------------------------------------------------*/
void SOUNDSCAPE_Shutdown
(
void
)
{
int Interrupt;
// Halt the DMA transfer
SOUNDSCAPE_StopPlayback();
// disable the AD-1848 interrupt pin
ad_write( AD_PINCTRL, ad_read( AD_PINCTRL ) & 0xfd );
// if necessary, do some signal re-routing
if ( SOUNDSCAPE_Config.ChipID != MMIC )
{
// re-init the CD-ROM (AD-1848) config register as needed.
// this will disable the AD-1848 interface.
if ( SOUNDSCAPE_Config.ChipID == ODIE )
{
ga_write( GA_CDCFG, SOUNDSCAPE_Config.CDROM );
}
else
{
ga_write( GA_CDCFG, ga_read( GA_CDCFG ) & 0x7f);
}
// if necessary, reset the SoundBlaster IRQ
if ( SOUNDSCAPE_Config.SBEmul )
{
ga_write( GA_INTCFG, ( ga_read( GA_INTCFG ) & 0xf3 ) |
( SOUNDSCAPE_Config.IRQIndx << 2 ) );
}
// re-assign the gate-array DMA channel
ga_write( GA_DMACHB, 0x80 | ( SOUNDSCAPE_Config.DMAChan << 4 ) );
}
// Restore the original interrupt
Interrupt = SOUNDSCAPE_Interrupts[ SOUNDSCAPE_Config.WaveIRQ ];
if ( SOUNDSCAPE_Config.WaveIRQ >= 8 )
{
IRQ_RestoreVector( Interrupt );
}
_dos_setvect( Interrupt, SOUNDSCAPE_OldInt );
SOUNDSCAPE_SoundPlaying = FALSE;
SOUNDSCAPE_DMABuffer = NULL;
SOUNDSCAPE_SetCallBack( NULL );
SOUNDSCAPE_UnlockMemory();
if ( StackSelector != NULL )
{
deallocateTimerStack( StackSelector );
StackSelector = NULL;
}
SOUNDSCAPE_Installed = FALSE;
}