ref: a20cc2d81463696a759b130f2d68f0d2f641075b
dir: /Game/src/audiolib/multivoc.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: MULTIVOC.C
author: James R. Dose
date: December 20, 1993
Routines to provide multichannel digitized sound playback for
Sound Blaster compatible sound cards.
(c) Copyright 1993 James R. Dose. All Rights Reserved.
**********************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "dpmi.h"
#include "usrhooks.h"
#include "linklist.h"
#include "sndcards.h"
#include "dsl.h"
#include "pitch.h"
#include "multivoc.h"
#include "_multivc.h"
#include "../sounddebugdefs.h"
#define RoundFixed( fixedval, bits ) \
( \
( \
(fixedval) + ( 1 << ( (bits) - 1 ) )\
) >> (bits) \
)
// #define IS_QUIET( ptr ) ( ( void * )( ptr ) == ( void * )&MV_VolumeTable[ 0 ] )
#define IS_QUIET( vol ) ( ( vol ) == 0 )
static int MV_ReverbLevel;
int MV_ReverbDelay;
static int MV_ReverbTable = -1;
//static signed short MV_VolumeTable[ MV_MaxVolume + 1 ][ 256 ];
//static signed short MV_VolumeTable[ 63 + 1 ][ 256 ];
//static Pan MV_PanTable[ MV_NumPanPositions ][ MV_MaxVolume + 1 ];
static Pan MV_PanTable[ MV_NumPanPositions ][ 63 + 1 ];
static int MV_Installed = FALSE;
static int MV_SoundCard = SC_Unknown;
static int MV_TotalVolume = MV_MaxTotalVolume;
static int MV_MaxVoices = 1;
int MV_BufferSize = MixBufferSize;
static int MV_BufferLength;
static int MV_NumberOfBuffers = NumberOfBuffers;
static int MV_MixMode = MONO_8BIT;
int MV_Channels = 1;
static int MV_Bits = 8;
static int MV_Silence = SILENCE_8BIT;
static int MV_SwapLeftRight = FALSE;
static int MV_RequestedMixRate;
int MV_MixRate;
static int MV_BuffShift;
static int MV_TotalMemory;
static int MV_FooMemory;
static void* MV_BufferDescriptor;
static int MV_BufferEmpty[ NumberOfBuffers ];
char *MV_MixBuffer[ NumberOfBuffers + 1 ];
double *MV_FooBuffer = NULL;
static VoiceNode *MV_Voices = NULL;
static volatile VoiceNode VoiceList;
static volatile VoiceNode VoicePool;
/*static*/ int MV_MixPage = 0;
static int MV_VoiceHandle = MV_MinVoiceHandle;
static void ( *MV_CallBackFunc )( unsigned long ) = NULL;
static void ( *MV_RecordFunc )( char *ptr, int length ) = NULL;
static void ( *MV_MixFunction )( VoiceNode *voice);
int MV_MaxVolume = 63;
int *MV_GLast, *MV_GPos, *MV_GVal;
// char *MV_HarshClipTable;
char *MV_MixDestination;
int MV_LeftVolume;
int MV_RightVolume;
int MV_SampleSize = 1;
int MV_RightChannelOffset;
unsigned long MV_MixPosition;
int MV_ErrorCode = MV_Ok;
#define MV_SetErrorCode( status ) \
MV_ErrorCode = ( status );
/*---------------------------------------------------------------------
Function: MV_ErrorString
Returns a pointer to the error message associated with an error
number. A -1 returns a pointer the current error.
---------------------------------------------------------------------*/
char *MV_ErrorString
(
int ErrorNumber
)
{
char *ErrorString;
switch( ErrorNumber )
{
case MV_Warning :
case MV_Error :
ErrorString = MV_ErrorString( MV_ErrorCode );
break;
case MV_Ok :
ErrorString = "Multivoc ok.\n";
break;
case MV_UnsupportedCard :
ErrorString = "Selected sound card is not supported by Multivoc.\n";
break;
case MV_NotInstalled :
ErrorString = "Multivoc not installed.\n";
break;
case MV_NoVoices :
ErrorString = "No free voices available to Multivoc.\n";
break;
case MV_NoMem :
ErrorString = "Out of memory in Multivoc.\n";
break;
case MV_VoiceNotFound :
ErrorString = "No voice with matching handle found.\n";
break;
case MV_DPMI_Error :
ErrorString = "DPMI Error in Multivoc.\n";
break;
case MV_InvalidVOCFile :
ErrorString = "Invalid VOC file passed in to Multivoc.\n";
break;
case MV_InvalidWAVFile :
ErrorString = "Invalid WAV file passed in to Multivoc.\n";
break;
case MV_InvalidMixMode :
ErrorString = "Invalid mix mode request in Multivoc.\n";
break;
case MV_SoundSourceFailure :
ErrorString = "Sound Source playback failed.\n";
break;
case MV_IrqFailure :
ErrorString = "Playback failed, possibly due to an invalid or conflicting IRQ.\n";
break;
case MV_DMAFailure :
ErrorString = "Playback failed, possibly due to an invalid or conflicting DMA channel.\n";
break;
case MV_DMA16Failure :
ErrorString = "Playback failed, possibly due to an invalid or conflicting DMA channel. \n"
"Make sure the 16-bit DMA channel is correct.\n";
break;
case MV_NullRecordFunction :
ErrorString = "Null record function passed to MV_StartRecording.\n";
break;
default :
ErrorString = "Unknown Multivoc error code.\n";
break;
}
return( ErrorString );
}
/**********************************************************************
Memory locked functions:
**********************************************************************/
#define MV_LockStart MV_Mix
/*---------------------------------------------------------------------
Function: MV_Mix
Mixes the sound into the buffer.
---------------------------------------------------------------------*/
static void MV_Mix( VoiceNode *voice )
{
uint8_t *start;
int length;
long voclength;
unsigned long position;
unsigned long rate;
unsigned long FixedPointBufferSize;
if ( ( voice->length == 0 )
&& ( voice->GetSound( voice ) != KeepPlaying ) )
{
return;
}
length = MixBufferSize;
FixedPointBufferSize = voice->FixedPointBufferSize;
MV_MixDestination = (char*)MV_FooBuffer;
MV_LeftVolume = voice->LeftVolume;
MV_RightVolume = voice->RightVolume;
MV_GLast = &voice->GLast;
MV_GPos = &voice->GPos;
MV_GVal = (int*)&voice->GVal;
if ( ( MV_Channels == 2 ) && ( IS_QUIET( MV_LeftVolume ) ) )
{
MV_LeftVolume = MV_RightVolume;
MV_MixDestination += 8;
}
// Add this voice to the mix
while( length > 0 )
{
start = voice->sound;
rate = voice->RateScale;
position = voice->position;
// Check if the last sample in this buffer would be
// beyond the length of the sample block
if ( ( position + FixedPointBufferSize ) >= voice->length )
{
if ( position < voice->length )
{
voclength = ( voice->length - position + rate - 1 ) / rate;
}
else
{
voice->GetSound( voice );
return;
}
}
else
{
voclength = length;
}
voice->mix( position, rate, start, voclength );
if ( voclength & 1 )
{
MV_MixPosition += rate;
voclength -= 1;
}
voice->position = MV_MixPosition;
length -= voclength;
if ( voice->position >= voice->length )
{
// Get the next block of sound
if ( voice->GetSound( voice ) != KeepPlaying )
{
return;
}
if ( length > 0 )
{
// Get the position of the last sample in the buffer
FixedPointBufferSize = voice->RateScale * ( length - 1 );
}
}
}
}
/*---------------------------------------------------------------------
Function: MV_PlayVoice
Adds a voice to the play list.
---------------------------------------------------------------------*/
void MV_PlayVoice( VoiceNode *voice )
{
LL_SortedInsertion( &VoiceList, voice, prev, next, VoiceNode, priority );
++sounddebugActiveSounds;
++sounddebugAllocateSoundCalls;
}
/*---------------------------------------------------------------------
Function: MV_StopVoice
Removes the voice from the play list and adds it to the free list.
---------------------------------------------------------------------*/
void MV_StopVoice( VoiceNode *voice )
{
VoiceNode* pPrev;
VoiceNode* pNext;
pPrev = voice->prev;
pNext = voice->next;
// move the voice from the play list to the free list
LL_Remove( voice, next, prev );
LL_Add( &VoicePool, voice, next, prev );
if(pPrev == NULL)
{
printf("(MV_StopVoice) pPrev is NULL, this could be a problem.\n");
}
if(pNext == NULL)
{
printf("(MV_StopVoice) pNext is NULL, this could be a problem.\n");
}
--sounddebugActiveSounds;
++sounddebugDeallocateSoundCalls;
}
/*---------------------------------------------------------------------
Function: MV_ServiceVoc
Starts playback of the waiting buffer and mixes the next one.
---------------------------------------------------------------------*/
// static int backcolor = 1;
void MV_ServiceVoc
(
void
)
{
VoiceNode *voice;
VoiceNode *next;
// Toggle which buffer we'll mix next
MV_MixPage++;
if ( MV_MixPage >= MV_NumberOfBuffers )
{
MV_MixPage -= MV_NumberOfBuffers;
}
{
ClearBuffer_DW( MV_FooBuffer, 0, sizeof(double) / 4 * MV_BufferSize / MV_SampleSize * MV_Channels);
MV_BufferEmpty[ MV_MixPage ] = TRUE;
}
// Play any waiting voices
for( voice = VoiceList.next; voice != &VoiceList; voice = next )
{
// if ( ( voice < &MV_Voices[ 0 ] ) || ( voice > &MV_Voices[ 8 ] ) )
// {
// SetBorderColor(backcolor++);
// break;
// }
if(NULL == voice->GetSound)
{
#ifdef _DEBUG
printf("MV_ServiceVoc() voice->GetSound == NULL, break;\n");
#endif
// This sound is null, early out, or face a nasty crash.
break;
}
MV_BufferEmpty[ MV_MixPage ] = FALSE;
MV_MixFunction( voice );
next = voice->next;
// Is this voice done?
if ( !voice->Playing )
{
MV_StopVoice( voice );
if ( MV_CallBackFunc )
{
MV_CallBackFunc( voice->callbackval );
}
}
}
if ( MV_ReverbLevel > 0)
{
if (MV_ReverbTable != -1) MV_FPReverb(MV_ReverbTable);
}
{
char *dest;
int count;
dest = MV_MixBuffer[ MV_MixPage ];
count = MV_BufferSize / MV_SampleSize * MV_Channels;
if ( MV_Bits == 16 )
{
MV_16BitDownmix(dest, count);
}
else
{
MV_8BitDownmix(dest, count);
}
}
}
/*---------------------------------------------------------------------
Function: MV_GetNextVOCBlock
Interperate the information of a VOC format sound file.
---------------------------------------------------------------------*/
playbackstatus MV_GetNextVOCBlock
(
VoiceNode *voice
)
{
unsigned char *ptr;
int blocktype;
int lastblocktype;
uint32_t blocklength;
unsigned long samplespeed;
unsigned int tc;
int packtype;
int voicemode;
int done;
unsigned BitsPerSample;
unsigned Channels;
unsigned Format;
if ( voice->BlockLength > 0 )
{
voice->position -= voice->length;
voice->sound += voice->length >> 16;
if ( voice->bits == 16 )
{
voice->sound += voice->length >> 16;
}
voice->length = min( voice->BlockLength, 0x8000 );
voice->BlockLength -= voice->length;
voice->length <<= 16;
return( KeepPlaying );
}
if ( ( voice->length > 0 ) && ( voice->LoopEnd != NULL ) &&
( voice->LoopStart != NULL ) )
{
voice->BlockLength = voice->LoopSize;
voice->sound = voice->LoopStart;
voice->position = 0;
voice->length = min( voice->BlockLength, 0x8000 );
voice->BlockLength -= voice->length;
voice->length <<= 16;
return( KeepPlaying );
}
ptr = ( unsigned char * )voice->NextBlock;
voice->Playing = TRUE;
voicemode = 0;
lastblocktype = 0;
packtype = 0;
done = FALSE;
while( !done )
{
// Stop playing if we get a NULL pointer
if ( ptr == NULL )
{
voice->Playing = FALSE;
done = TRUE;
break;
}
blocktype = ( int )*ptr;
blocklength = ( *( unsigned long * )( ptr + 1 ) ) & 0x00ffffff;
ptr += 4;
switch( blocktype )
{
case 0 :
// End of data
if ( ( voice->LoopStart == NULL ) ||
( voice->LoopStart >= ( ptr - 4 ) ) )
{
voice->Playing = FALSE;
done = TRUE;
}
else
{
voice->BlockLength = ( ptr - 4 ) - (unsigned char *)voice->LoopStart;
voice->sound = voice->LoopStart;
voice->position = 0;
voice->length = min( voice->BlockLength, 0x8000 );
voice->BlockLength -= voice->length;
voice->length <<= 16;
return( KeepPlaying );
}
break;
case 1 :
// Sound data block
voice->bits = 8;
if ( lastblocktype != 8 )
{
tc = ( unsigned int )*ptr << 8;
packtype = *( ptr + 1 );
}
ptr += 2;
blocklength -= 2;
samplespeed = 256000000L / ( 65536 - tc );
// Skip packed or stereo data
if ( ( packtype != 0 ) || ( voicemode != 0 ) )
{
ptr += blocklength;
}
else
{
done = TRUE;
}
voicemode = 0;
break;
case 2 :
// Sound continuation block
samplespeed = voice->SamplingRate;
done = TRUE;
break;
case 3 :
// Silence
// Not implimented.
ptr += blocklength;
break;
case 4 :
// Marker
// Not implimented.
ptr += blocklength;
break;
case 5 :
// ASCII string
// Not implimented.
ptr += blocklength;
break;
case 6 :
// Repeat begin
if ( voice->LoopEnd == NULL )
{
voice->LoopCount = *( uint16_t * )ptr;
voice->LoopStart = ptr + blocklength;
}
ptr += blocklength;
break;
case 7 :
// Repeat end
ptr += blocklength;
if ( lastblocktype == 6 )
{
voice->LoopCount = 0;
}
else
{
if ( ( voice->LoopCount > 0 ) && ( voice->LoopStart != NULL ) )
{
ptr = voice->LoopStart;
if ( voice->LoopCount < 0xffff )
{
voice->LoopCount--;
if ( voice->LoopCount == 0 )
{
voice->LoopStart = NULL;
}
}
}
}
break;
case 8 :
// Extended block
voice->bits = 8;
tc = *( uint16_t * )ptr;
packtype = *( ptr + 2 );
voicemode = *( ptr + 3 );
ptr += blocklength;
break;
case 9 :
// New sound data block
samplespeed = *( unsigned long * )ptr;
BitsPerSample = ( unsigned )*( ptr + 4 );
Channels = ( unsigned )*( ptr + 5 );
Format = ( unsigned )*( uint16_t * )( ptr + 6 );
if ( ( BitsPerSample == 8 ) && ( Channels == 1 ) &&
( Format == VOC_8BIT ) )
{
ptr += 12;
blocklength -= 12;
voice->bits = 8;
done = TRUE;
}
else if ( ( BitsPerSample == 16 ) && ( Channels == 1 ) &&
( Format == VOC_16BIT ) )
{
ptr += 12;
blocklength -= 12;
voice->bits = 16;
done = TRUE;
}
else
{
ptr += blocklength;
}
break;
default :
// Unknown data. Probably not a VOC file.
voice->Playing = FALSE;
done = TRUE;
break;
}
lastblocktype = blocktype;
}
if ( voice->Playing )
{
voice->NextBlock = ptr + blocklength;
voice->sound = ptr;
voice->SamplingRate = samplespeed;
voice->RateScale = ( voice->SamplingRate * voice->PitchScale ) / MV_MixRate;
// Multiply by MixBufferSize - 1
voice->FixedPointBufferSize = ( voice->RateScale * MixBufferSize ) -
voice->RateScale;
if ( voice->LoopEnd != NULL )
{
if ( blocklength > ( unsigned long )voice->LoopEnd )
{
blocklength = ( unsigned long )voice->LoopEnd;
}
else
{
voice->LoopEnd = ( char * )blocklength;
}
voice->LoopStart = voice->sound + ( unsigned long )voice->LoopStart;
voice->LoopEnd = voice->sound + ( unsigned long )voice->LoopEnd;
voice->LoopSize = voice->LoopEnd - voice->LoopStart;
}
if ( voice->bits == 16 )
{
blocklength /= 2;
}
voice->position = 0;
voice->length = min( blocklength, 0x8000 );
voice->BlockLength = blocklength - voice->length;
voice->length <<= 16;
MV_SetVoiceMixMode( voice );
return( KeepPlaying );
}
return( NoMoreData );
}
/*---------------------------------------------------------------------
Function: MV_GetNextDemandFeedBlock
Controls playback of demand fed data.
---------------------------------------------------------------------*/
playbackstatus MV_GetNextDemandFeedBlock
(
VoiceNode *voice
)
{
if ( voice->BlockLength > 0 )
{
voice->position -= voice->length;
voice->sound += voice->length >> 16;
voice->length = min( voice->BlockLength, 0x8000 );
voice->BlockLength -= voice->length;
voice->length <<= 16;
return( KeepPlaying );
}
if ( voice->DemandFeed == NULL )
{
return( NoMoreData );
}
voice->position = 0;
( voice->DemandFeed )( &voice->sound, &voice->BlockLength );
voice->length = min( voice->BlockLength, 0x8000 );
voice->BlockLength -= voice->length;
voice->length <<= 16;
if ( ( voice->length > 0 ) && ( voice->sound != NULL ) )
{
return( KeepPlaying );
}
return( NoMoreData );
}
/*---------------------------------------------------------------------
Function: MV_GetNextRawBlock
Controls playback of demand fed data.
---------------------------------------------------------------------*/
playbackstatus MV_GetNextRawBlock
(
VoiceNode *voice
)
{
if ( voice->BlockLength <= 0 )
{
if ( voice->LoopStart == NULL )
{
voice->Playing = FALSE;
return( NoMoreData );
}
voice->BlockLength = voice->LoopSize;
voice->NextBlock = voice->LoopStart;
voice->length = 0;
voice->position = 0;
}
voice->sound = voice->NextBlock;
voice->position -= voice->length;
voice->length = min( voice->BlockLength, 0x8000 );
voice->NextBlock += voice->length;
if ( voice->bits == 16 )
{
voice->NextBlock += voice->length;
}
voice->BlockLength -= voice->length;
voice->length <<= 16;
return( KeepPlaying );
}
/*---------------------------------------------------------------------
Function: MV_GetNextWAVBlock
Controls playback of demand fed data.
---------------------------------------------------------------------*/
playbackstatus MV_GetNextWAVBlock
(
VoiceNode *voice
)
{
if ( voice->BlockLength <= 0 )
{
if ( voice->LoopStart == NULL )
{
voice->Playing = FALSE;
return( NoMoreData );
}
voice->BlockLength = voice->LoopSize;
voice->NextBlock = voice->LoopStart;
voice->length = 0;
voice->position = 0;
}
voice->sound = voice->NextBlock;
voice->position -= voice->length;
voice->length = min( voice->BlockLength, 0x8000 );
voice->NextBlock += voice->length;
if ( voice->bits == 16 )
{
voice->NextBlock += voice->length;
}
voice->BlockLength -= voice->length;
voice->length <<= 16;
return( KeepPlaying );
}
/*---------------------------------------------------------------------
Function: MV_GetVoice
Locates the voice with the specified handle.
---------------------------------------------------------------------*/
VoiceNode *MV_GetVoice
(
int handle
)
{
VoiceNode *voice;
for( voice = VoiceList.next; voice != &VoiceList; voice = voice->next )
{
if ( handle == voice->handle )
{
break;
}
}
if ( voice == &VoiceList )
{
MV_SetErrorCode( MV_VoiceNotFound );
// SBF - should this return null?
return NULL;
}
return( voice );
}
/*---------------------------------------------------------------------
Function: MV_VoicePlaying
Checks if the voice associated with the specified handle is
playing.
---------------------------------------------------------------------*/
int MV_VoicePlaying
(
int handle
)
{
VoiceNode *voice;
if ( !MV_Installed )
{
MV_SetErrorCode( MV_NotInstalled );
return( FALSE );
}
voice = MV_GetVoice( handle );
if ( voice == NULL )
{
return( FALSE );
}
return( TRUE );
}
/*---------------------------------------------------------------------
Function: MV_KillAllVoices
Stops output of all currently active voices.
---------------------------------------------------------------------*/
int MV_KillAllVoices
(
void
)
{
if ( !MV_Installed )
{
MV_SetErrorCode( MV_NotInstalled );
return( MV_Error );
}
// Remove all the voices from the list
while( VoiceList.next != &VoiceList )
{
MV_Kill( VoiceList.next->handle );
}
return( MV_Ok );
}
/*---------------------------------------------------------------------
Function: MV_Kill
Stops output of the voice associated with the specified handle.
---------------------------------------------------------------------*/
int MV_Kill
(
int handle
)
{
VoiceNode *voice;
unsigned long callbackval;
if ( !MV_Installed )
{
MV_SetErrorCode( MV_NotInstalled );
return( MV_Error );
}
voice = MV_GetVoice( handle );
if ( voice == NULL )
{
MV_SetErrorCode( MV_VoiceNotFound );
return( MV_Error );
}
callbackval = voice->callbackval;
MV_StopVoice( voice );
if ( MV_CallBackFunc )
{
MV_CallBackFunc( callbackval );
}
return( MV_Ok );
}
/*---------------------------------------------------------------------
Function: MV_VoicesPlaying
Determines the number of currently active voices.
---------------------------------------------------------------------*/
int MV_VoicesPlaying
(
void
)
{
VoiceNode *voice;
int NumVoices = 0;
if ( !MV_Installed )
{
MV_SetErrorCode( MV_NotInstalled );
return( 0 );
}
for( voice = VoiceList.next; voice != &VoiceList; voice = voice->next )
{
NumVoices++;
}
return( NumVoices );
}
/*---------------------------------------------------------------------
Function: MV_AllocVoice
Retrieve an inactive or lower priority voice for output.
---------------------------------------------------------------------*/
VoiceNode *MV_AllocVoice
(
int priority
)
{
VoiceNode *voice;
VoiceNode *node;
// Check if we have any free voices
if ( LL_Empty( &VoicePool, next, prev ) )
{
// check if we have a higher priority than a voice that is playing.
voice = VoiceList.next;
for( node = voice->next; node != &VoiceList; node = node->next )
{
if ( node->priority < voice->priority )
{
voice = node;
}
}
if ( priority >= voice->priority )
{
MV_Kill( voice->handle );
}
}
// Check if any voices are in the voice pool
if ( LL_Empty( &VoicePool, next, prev ) )
{
// No free voices
return( NULL );
}
voice = VoicePool.next;
LL_Remove( voice, next, prev );
// Find a free voice handle
do
{
MV_VoiceHandle++;
if ( MV_VoiceHandle < MV_MinVoiceHandle )
{
MV_VoiceHandle = MV_MinVoiceHandle;
}
}
while( MV_VoicePlaying( MV_VoiceHandle ) );
voice->handle = MV_VoiceHandle;
return( voice );
}
/*---------------------------------------------------------------------
Function: MV_VoiceAvailable
Checks if a voice can be play at the specified priority.
---------------------------------------------------------------------*/
int MV_VoiceAvailable
(
int priority
)
{
VoiceNode *voice;
VoiceNode *node;
unsigned flags;
// Check if we have any free voices
if ( !LL_Empty( &VoicePool, next, prev ) )
{
return( TRUE );
}
// check if we have a higher priority than a voice that is playing.
voice = VoiceList.next;
for( node = VoiceList.next; node != &VoiceList; node = node->next )
{
if ( node->priority < voice->priority )
{
voice = node;
}
}
if ( ( voice != &VoiceList ) && ( priority >= voice->priority ) )
{
return( TRUE );
}
return( FALSE );
}
/*---------------------------------------------------------------------
Function: MV_SetVoicePitch
Sets the pitch for the specified voice.
---------------------------------------------------------------------*/
void MV_SetVoicePitch
(
VoiceNode *voice,
unsigned long rate,
int pitchoffset
)
{
voice->SamplingRate = rate;
voice->PitchScale = PITCH_GetScale( pitchoffset );
voice->RateScale = ( rate * voice->PitchScale ) / MV_MixRate;
// Multiply by MixBufferSize - 1
voice->FixedPointBufferSize = ( voice->RateScale * MixBufferSize ) -
voice->RateScale;
}
/*---------------------------------------------------------------------
Function: MV_GetVolumeTable
Returns a pointer to the volume table associated with the specified
volume.
---------------------------------------------------------------------*/
#if 0
static short *MV_GetVolumeTable
(
int vol
)
{
int volume;
short *table;
volume = MIX_VOLUME( vol );
table = &MV_VolumeTable[ volume ];
return( table );
}
#else
static int MV_GetVolumeTable
(
int vol
)
{
int volume;
volume = MIX_VOLUME( vol );
return ( volume * MV_TotalVolume ) / MV_MaxTotalVolume;
}
#endif
/*---------------------------------------------------------------------
Function: MV_SetVoiceMixMode
Selects which method should be used to mix the voice.
---------------------------------------------------------------------*/
void MV_SetVoiceMixMode
(
VoiceNode *voice
)
{
int test;
test = T_DEFAULT;
if ( voice->bits == 16 )
{
test |= T_16BITSOURCE;
}
if ( MV_Channels == 1 )
{
test |= T_MONO;
}
else
{
if ( IS_QUIET( voice->RightVolume ) )
{
test |= T_RIGHTQUIET;
}
else if ( IS_QUIET( voice->LeftVolume ) )
{
test |= T_LEFTQUIET;
}
}
switch( test )
{
case T_MONO | T_16BITSOURCE :
voice->mix = MV_MixFPMono16;
break;
case T_MONO :
voice->mix = MV_MixFPMono8;
break;
case T_16BITSOURCE | T_LEFTQUIET :
MV_LeftVolume = MV_RightVolume;
voice->mix = MV_MixFPMono16;
break;
case T_LEFTQUIET :
MV_LeftVolume = MV_RightVolume;
voice->mix = MV_MixFPMono8;
break;
case T_16BITSOURCE | T_RIGHTQUIET :
voice->mix = MV_MixFPMono16;
break;
case T_RIGHTQUIET :
voice->mix = MV_MixFPMono8;
break;
case T_16BITSOURCE :
voice->mix = MV_MixFPStereo16;
break;
case T_SIXTEENBIT_STEREO :
voice->mix = MV_MixFPStereo8;
break;
default :
voice->mix = MV_MixFPMono8;
}
}
/*---------------------------------------------------------------------
Function: MV_SetVoiceVolume
Sets the stereo and mono volume level of the voice associated
with the specified handle.
---------------------------------------------------------------------*/
void MV_SetVoiceVolume
(
VoiceNode *voice,
int vol,
int left,
int right
)
{
if ( MV_Channels == 1 )
{
left = vol;
right = vol;
}
if ( MV_SwapLeftRight )
{
// SBPro uses reversed panning
voice->LeftVolume = MV_GetVolumeTable( right );
voice->RightVolume = MV_GetVolumeTable( left );
}
else
{
voice->LeftVolume = MV_GetVolumeTable( left );
voice->RightVolume = MV_GetVolumeTable( right );
}
MV_SetVoiceMixMode( voice );
}
/*---------------------------------------------------------------------
Function: MV_SetPan
Sets the stereo and mono volume level of the voice associated
with the specified handle.
---------------------------------------------------------------------*/
int MV_SetPan
(
int handle,
int vol,
int left,
int right
)
{
VoiceNode *voice;
if ( !MV_Installed )
{
MV_SetErrorCode( MV_NotInstalled );
return( MV_Error );
}
voice = MV_GetVoice( handle );
if ( voice == NULL )
{
MV_SetErrorCode( MV_VoiceNotFound );
return( MV_Warning );
}
MV_SetVoiceVolume( voice, vol, left, right );
return( MV_Ok );
}
/*---------------------------------------------------------------------
Function: MV_Pan3D
Set the angle and distance from the listener of the voice associated
with the specified handle.
---------------------------------------------------------------------*/
int MV_Pan3D
(
int handle,
int angle,
int distance
)
{
int left;
int right;
int mid;
int volume;
int status;
if ( distance < 0 )
{
distance = -distance;
angle += MV_NumPanPositions / 2;
}
volume = MIX_VOLUME( distance );
// Ensure angle is within 0 - 31
angle &= MV_MaxPanPosition;
left = MV_PanTable[ angle ][ volume ].left;
right = MV_PanTable[ angle ][ volume ].right;
mid = max( 0, 255 - distance );
status = MV_SetPan( handle, mid, left, right );
return( status );
}
/*---------------------------------------------------------------------
Function: MV_SetReverb
Sets the level of reverb to add to mix.
---------------------------------------------------------------------*/
void MV_SetReverb
(
int reverb
)
{
MV_ReverbLevel = MIX_VOLUME( reverb );
MV_ReverbTable = ( MV_ReverbLevel * MV_TotalVolume ) / MV_MaxTotalVolume;// &MV_VolumeTable[ MV_ReverbLevel ];
if (!reverb) MV_FPReverbFree();
}
/*---------------------------------------------------------------------
Function: MV_GetMaxReverbDelay
Returns the maximum delay time for reverb.
---------------------------------------------------------------------*/
int MV_GetMaxReverbDelay
(
void
)
{
int maxdelay;
maxdelay = 65536; //MixBufferSize * MV_NumberOfBuffers;
return maxdelay;
}
/*---------------------------------------------------------------------
Function: MV_SetReverbDelay
Sets the delay level of reverb to add to mix.
---------------------------------------------------------------------*/
void MV_SetReverbDelay
(
int delay
)
{
int maxdelay;
if (!delay) // blah, ignore
return;
maxdelay = MV_GetMaxReverbDelay();
MV_ReverbDelay = max( MixBufferSize, min( delay, maxdelay ) );
// MV_ReverbDelay *= MV_SampleSize;
}
/*---------------------------------------------------------------------
Function: MV_SetMixMode
Prepares Multivoc to play stereo of mono digitized sounds.
---------------------------------------------------------------------*/
int MV_SetMixMode
(
int numchannels,
int samplebits
)
{
int mode;
if ( !MV_Installed )
{
MV_SetErrorCode( MV_NotInstalled );
return( MV_Error );
}
mode = 0;
if ( numchannels == 2 )
{
mode |= STEREO;
}
if ( samplebits == 16 )
{
mode |= SIXTEEN_BIT;
}
MV_MixMode = mode;
MV_Channels = 1;
if ( MV_MixMode & STEREO )
{
MV_Channels = 2;
}
MV_Bits = 8;
if ( MV_MixMode & SIXTEEN_BIT )
{
MV_Bits = 16;
}
MV_BuffShift = 7 + MV_Channels;
MV_SampleSize = sizeof( MONO8 ) * MV_Channels;
if ( MV_Bits == 8 )
{
MV_Silence = SILENCE_8BIT;
}
else
{
MV_Silence = SILENCE_16BIT;
MV_BuffShift += 1;
MV_SampleSize *= 2;
}
MV_BufferSize = MixBufferSize * MV_SampleSize;
MV_NumberOfBuffers = TotalBufferSize / MV_BufferSize;
MV_BufferLength = TotalBufferSize;
MV_RightChannelOffset = MV_SampleSize / 2;
return( MV_Ok );
}
/*---------------------------------------------------------------------
Function: MV_StartPlayback
Starts the sound playback engine.
---------------------------------------------------------------------*/
int MV_StartPlayback()
{
int status;
int buffer;
// Initialize the buffers
ClearBuffer_DW( MV_MixBuffer[ 0 ], MV_Silence, TotalBufferSize >> 2 );
for( buffer = 0; buffer < MV_NumberOfBuffers; buffer++ )
{
MV_BufferEmpty[ buffer ] = TRUE;
}
// Set the mix buffer variables
MV_MixPage = 1;
MV_MixFunction = MV_Mix;
//JIM
// MV_MixRate = MV_RequestedMixRate;
// return( MV_Ok );
// Start playback
status = DSL_BeginBufferedPlayback( MV_MixBuffer[ 0 ],
TotalBufferSize,
MV_NumberOfBuffers,
MV_RequestedMixRate,
MV_MixMode,
MV_ServiceVoc );
if ( status != DSL_Ok )
{
MV_SetErrorCode( MV_BlasterError );
return( MV_Error );
}
MV_MixRate = DSL_GetPlaybackRate();
return( MV_Ok );
}
/*---------------------------------------------------------------------
Function: MV_StopPlayback
Stops the sound playback engine.
---------------------------------------------------------------------*/
void MV_StopPlayback
(
void
)
{
VoiceNode *voice;
VoiceNode *next;
unsigned flags;
DSL_StopPlayback();
// Make sure all callbacks are done.
for( voice = VoiceList.next; voice != &VoiceList; voice = next )
{
next = voice->next;
MV_StopVoice( voice );
if ( MV_CallBackFunc )
{
MV_CallBackFunc( voice->callbackval );
}
}
}
/*---------------------------------------------------------------------
Function: MV_PlayWAV
Begin playback of sound data with the given sound levels and
priority.
---------------------------------------------------------------------*/
int MV_PlayWAV
(
uint8_t *ptr,
int pitchoffset,
int vol,
int left,
int right,
int priority,
unsigned long callbackval
)
{
int status;
status = MV_PlayLoopedWAV( ptr, -1, -1, pitchoffset, vol, left, right,
priority, callbackval );
return( status );
}
/*---------------------------------------------------------------------
Function: MV_PlayWAV3D
Begin playback of sound data at specified angle and distance
from listener.
---------------------------------------------------------------------*/
int MV_PlayWAV3D
(
uint8_t *ptr,
int pitchoffset,
int angle,
int distance,
int priority,
unsigned long callbackval
)
{
int left;
int right;
int mid;
int volume;
int status;
if ( !MV_Installed )
{
MV_SetErrorCode( MV_NotInstalled );
return( MV_Error );
}
if ( distance < 0 )
{
distance = -distance;
angle += MV_NumPanPositions / 2;
}
volume = MIX_VOLUME( distance );
// Ensure angle is within 0 - 31
angle &= MV_MaxPanPosition;
left = MV_PanTable[ angle ][ volume ].left;
right = MV_PanTable[ angle ][ volume ].right;
mid = max( 0, 255 - distance );
status = MV_PlayWAV( ptr, pitchoffset, mid, left, right, priority,
callbackval );
return( status );
}
/*---------------------------------------------------------------------
Function: MV_PlayLoopedWAV
Begin playback of sound data with the given sound levels and
priority.
---------------------------------------------------------------------*/
int MV_PlayLoopedWAV
(
uint8_t *ptr,
long loopstart,
long loopend,
int pitchoffset,
int vol,
int left,
int right,
int priority,
unsigned long callbackval
)
{
riff_header *riff;
format_header *format;
data_header *data;
VoiceNode *voice;
int length;
int absloopend;
int absloopstart;
if ( !MV_Installed )
{
MV_SetErrorCode( MV_NotInstalled );
return( MV_Error );
}
riff = ( riff_header * )ptr;
if ( ( strncmp( riff->RIFF, "RIFF", 4 ) != 0 ) ||
( strncmp( riff->WAVE, "WAVE", 4 ) != 0 ) ||
( strncmp( riff->fmt, "fmt ", 4) != 0 ) )
{
MV_SetErrorCode( MV_InvalidWAVFile );
return( MV_Error );
}
format = ( format_header * )( riff + 1 );
data = ( data_header * )( ( ( char * )format ) + riff->format_size );
// Check if it's PCM data.
if ( format->wFormatTag != 1 )
{
MV_SetErrorCode( MV_InvalidWAVFile );
return( MV_Error );
}
if ( format->nChannels != 1 )
{
MV_SetErrorCode( MV_InvalidWAVFile );
return( MV_Error );
}
if ( ( format->nBitsPerSample != 8 ) &&
( format->nBitsPerSample != 16 ) )
{
MV_SetErrorCode( MV_InvalidWAVFile );
return( MV_Error );
}
if ( strncmp( data->DATA, "data", 4 ) != 0 )
{
MV_SetErrorCode( MV_InvalidWAVFile );
return( MV_Error );
}
// Request a voice from the voice pool
voice = MV_AllocVoice( priority );
if ( voice == NULL )
{
MV_SetErrorCode( MV_NoVoices );
return( MV_Error );
}
voice->wavetype = WAV;
voice->bits = format->nBitsPerSample;
voice->GetSound = MV_GetNextWAVBlock;
length = data->size;
absloopstart = loopstart;
absloopend = loopend;
if ( voice->bits == 16 )
{
loopstart *= 2;
data->size &= ~1;
loopend *= 2;
length /= 2;
}
loopend = min( loopend, data->size );
absloopend = min( absloopend, length );
voice->Playing = TRUE;
voice->DemandFeed = NULL;
voice->LoopStart = NULL;
voice->LoopCount = 0;
voice->position = 0;
voice->length = 0;
voice->BlockLength = absloopend;
voice->NextBlock = ( char * )( data + 1 );
voice->next = NULL;
voice->prev = NULL;
voice->priority = priority;
voice->GLast = -1;
voice->GPos = 0;
voice->GVal[0] = 0;
voice->GVal[1] = 0;
voice->GVal[2] = 0;
voice->GVal[3] = 0;
voice->callbackval = callbackval;
voice->LoopStart = voice->NextBlock + loopstart;
voice->LoopEnd = voice->NextBlock + loopend;
voice->LoopSize = absloopend - absloopstart;
if ( ( loopstart >= data->size ) || ( loopstart < 0 ) )
{
voice->LoopStart = NULL;
voice->LoopEnd = NULL;
voice->BlockLength = length;
}
MV_SetVoicePitch( voice, format->nSamplesPerSec, pitchoffset );
MV_SetVoiceVolume( voice, vol, left, right );
MV_PlayVoice( voice );
return( voice->handle );
}
/*---------------------------------------------------------------------
Function: MV_PlayVOC3D
Begin playback of sound data at specified angle and distance
from listener.
---------------------------------------------------------------------*/
int MV_PlayVOC3D
(
uint8_t *ptr,
int pitchoffset,
int angle,
int distance,
int priority,
unsigned long callbackval
)
{
int left;
int right;
int mid;
int volume;
int status;
if ( !MV_Installed )
{
MV_SetErrorCode( MV_NotInstalled );
return( MV_Error );
}
if ( distance < 0 )
{
distance = -distance;
angle += MV_NumPanPositions / 2;
}
volume = MIX_VOLUME( distance );
// Ensure angle is within 0 - 31
angle &= MV_MaxPanPosition;
left = MV_PanTable[ angle ][ volume ].left;
right = MV_PanTable[ angle ][ volume ].right;
mid = max( 0, 255 - distance );
status = MV_PlayVOC( ptr, pitchoffset, mid, left, right, priority,
callbackval );
return( status );
}
/*---------------------------------------------------------------------
Function: MV_PlayVOC
Begin playback of sound data with the given sound levels and
priority.
---------------------------------------------------------------------*/
int MV_PlayVOC
(
uint8_t *ptr,
int pitchoffset,
int vol,
int left,
int right,
int priority,
unsigned long callbackval
)
{
int status;
status = MV_PlayLoopedVOC( ptr, -1, -1, pitchoffset, vol, left, right,
priority, callbackval );
return( status );
}
/*---------------------------------------------------------------------
Function: MV_PlayLoopedVOC
Begin playback of sound data with the given sound levels and
priority.
---------------------------------------------------------------------*/
int MV_PlayLoopedVOC
(
uint8_t *ptr,
long loopstart,
long loopend,
int pitchoffset,
int vol,
int left,
int right,
int priority,
uint32_t callbackval
)
{
VoiceNode *voice;
int status;
if ( !MV_Installed )
{
MV_SetErrorCode( MV_NotInstalled );
return( MV_Error );
}
// Make sure it's a valid VOC file.
status = strncmp( (char*)ptr, "Creative Voice File", 19 );
if ( status != 0 )
{
MV_SetErrorCode( MV_InvalidVOCFile );
return( MV_Error );
}
// Request a voice from the voice pool
voice = MV_AllocVoice( priority );
if ( voice == NULL )
{
MV_SetErrorCode( MV_NoVoices );
return( MV_Error );
}
voice->wavetype = VOC;
voice->bits = 8;
voice->GetSound = MV_GetNextVOCBlock;
voice->NextBlock = ptr + *( uint16_t * )( ptr + 0x14 );
voice->DemandFeed = NULL;
voice->LoopStart = NULL;
voice->LoopCount = 0;
voice->BlockLength = 0;
voice->PitchScale = PITCH_GetScale( pitchoffset );
voice->length = 0;
voice->next = NULL;
voice->prev = NULL;
voice->priority = priority;
voice->GLast = -1;
voice->GPos = 0;
voice->GVal[0] = 0;
voice->GVal[1] = 0;
voice->GVal[2] = 0;
voice->GVal[3] = 0;
voice->callbackval = callbackval;
voice->LoopStart = ( char * )loopstart;
voice->LoopEnd = ( char * )loopend;
voice->LoopSize = loopend - loopstart + 1;
if ( loopstart < 0 )
{
voice->LoopStart = NULL;
voice->LoopEnd = NULL;
}
MV_SetVoiceVolume( voice, vol, left, right );
MV_PlayVoice( voice );
return( voice->handle );
}
/*---------------------------------------------------------------------
Function: MV_LockEnd
Used for determining the length of the functions to lock in memory.
---------------------------------------------------------------------*/
static void MV_LockEnd
(
void
)
{
}
#if 0
/*---------------------------------------------------------------------
Function: MV_CreateVolumeTable
Create the table used to convert sound data to a specific volume
level.
---------------------------------------------------------------------*/
void MV_CreateVolumeTable
(
int index,
int volume,
int MaxVolume
)
{
int val;
int level;
int i;
level = ( volume * MaxVolume ) / MV_MaxTotalVolume;
if ( MV_Bits == 16 )
{
for( i = 0; i < 65536; i += 256 )
{
val = i - 0x8000;
val *= level;
val /= MV_MaxVolume;
MV_VolumeTable[ index ][ i / 256 ] = val;
}
}
else
{
for( i = 0; i < 256; i++ )
{
val = i - 0x80;
val *= level;
val /= MV_MaxVolume;
MV_VolumeTable[ volume ][ i ] = val;
}
}
}
#endif
/*---------------------------------------------------------------------
Function: MV_CalcVolume
Create the table used to convert sound data to a specific volume
level.
---------------------------------------------------------------------*/
void MV_CalcVolume(int MaxVolume)
{
}
/*---------------------------------------------------------------------
Function: MV_CalcPanTable
Create the table used to determine the stereo volume level of
a sound located at a specific angle and distance from the listener.
---------------------------------------------------------------------*/
void MV_CalcPanTable
(
void
)
{
int level;
int angle;
int distance;
int HalfAngle;
int ramp;
HalfAngle = ( MV_NumPanPositions / 2 );
for( distance = 0; distance <= MV_MaxVolume; distance++ )
{
level = ( 255 * ( MV_MaxVolume - distance ) ) / MV_MaxVolume;
for( angle = 0; angle <= HalfAngle / 2; angle++ )
{
ramp = level - ( ( level * angle ) /
( MV_NumPanPositions / 4 ) );
MV_PanTable[ angle ][ distance ].left = ramp;
MV_PanTable[ HalfAngle - angle ][ distance ].left = ramp;
MV_PanTable[ HalfAngle + angle ][ distance ].left = level;
MV_PanTable[ MV_MaxPanPosition - angle ][ distance ].left = level;
MV_PanTable[ angle ][ distance ].right = level;
MV_PanTable[ HalfAngle - angle ][ distance ].right = level;
MV_PanTable[ HalfAngle + angle ][ distance ].right = ramp;
MV_PanTable[ MV_MaxPanPosition - angle ][ distance ].right = ramp;
}
}
}
/*---------------------------------------------------------------------
Function: MV_SetVolume
Sets the volume of digitized sound playback.
---------------------------------------------------------------------*/
void MV_SetVolume
(
int volume
)
{
volume = max( 0, volume );
volume = min( volume, MV_MaxTotalVolume );
MV_TotalVolume = volume;
// Calculate volume table
MV_CalcVolume( volume );
}
/*---------------------------------------------------------------------
Function: MV_GetVolume
Returns the volume of digitized sound playback.
---------------------------------------------------------------------*/
int MV_GetVolume
(
void
)
{
return( MV_TotalVolume );
}
/*---------------------------------------------------------------------
Function: MV_SetCallBack
Set the function to call when a voice stops.
---------------------------------------------------------------------*/
void MV_SetCallBack
(
void ( *function )( int32_t )
)
{
MV_CallBackFunc = function;
}
/*---------------------------------------------------------------------
Function: MV_SetReverseStereo
Set the orientation of the left and right channels.
---------------------------------------------------------------------*/
void MV_SetReverseStereo
(
int setting
)
{
MV_SwapLeftRight = setting;
}
/*---------------------------------------------------------------------
Function: MV_GetReverseStereo
Returns the orientation of the left and right channels.
---------------------------------------------------------------------*/
int MV_GetReverseStereo
(
void
)
{
return( MV_SwapLeftRight );
}
/*---------------------------------------------------------------------
Function: MV_TestPlayback
Checks if playback has started.
---------------------------------------------------------------------*/
int MV_TestPlayback(void)
{
return MV_Ok;
}
/*---------------------------------------------------------------------
Function: MV_Init
Perform the initialization of variables and memory used by
Multivoc.
---------------------------------------------------------------------*/
int MV_Init
(
int soundcard,
int MixRate,
int Voices,
int numchannels,
int samplebits
)
{
char *ptr;
int status;
int buffer;
int index;
if ( MV_Installed )
{
MV_Shutdown();
}
MV_SetErrorCode( MV_Ok );
MV_TotalMemory = Voices * sizeof( VoiceNode ); // + sizeof( HARSH_CLIP_TABLE_8 );
status = USRHOOKS_GetMem( ( void ** )&ptr, MV_TotalMemory );
if ( status != USRHOOKS_Ok )
{
MV_SetErrorCode( MV_NoMem );
return( MV_Error );
}
MV_Voices = ( VoiceNode * )ptr;
// MV_HarshClipTable = ptr + ( MV_TotalMemory - sizeof( HARSH_CLIP_TABLE_8 ) );
// Set number of voices before calculating volume table
MV_MaxVoices = Voices;
LL_Reset( &VoiceList, next, prev );
LL_Reset( &VoicePool, next, prev );
for( index = 0; index < Voices; index++ )
{
LL_Add( &VoicePool, &MV_Voices[ index ], next, prev );
}
// Allocate mix buffer within 1st megabyte
status = DPMI_GetDOSMemory( ( void ** )&ptr, &MV_BufferDescriptor, 2 * TotalBufferSize);
if ( status )
{
USRHOOKS_FreeMem( MV_Voices );
MV_Voices = NULL;
MV_TotalMemory = 0;
MV_SetErrorCode( MV_NoMem );
return( MV_Error );
}
MV_SetReverseStereo( FALSE );
// Initialize the sound card
status = DSL_Init();
if ( status != DSL_Ok )
{
MV_SetErrorCode( MV_BlasterError );
}
if ( MV_ErrorCode != MV_Ok )
{
status = MV_ErrorCode;
USRHOOKS_FreeMem( MV_Voices );
MV_Voices = NULL;
MV_TotalMemory = 0;
DPMI_FreeDOSMemory( MV_BufferDescriptor );
MV_SetErrorCode( status );
return( MV_Error );
}
MV_SoundCard = soundcard;
MV_Installed = TRUE;
MV_CallBackFunc = NULL;
MV_RecordFunc = NULL;
MV_ReverbLevel = 0;
MV_ReverbTable = -1;
// Set the sampling rate
MV_RequestedMixRate = MixRate;
// Set Mixer to play stereo digitized sound
MV_SetMixMode( numchannels, samplebits );
MV_ReverbDelay = 14320; // MV_BufferSize * 3;
//InitializeCriticalSection(&reverbCS);
reverbMutex = SDL_CreateMutex();
MV_MixBuffer[ MV_NumberOfBuffers ] = ptr;
for( buffer = 0; buffer < MV_NumberOfBuffers; buffer++ )
{
MV_MixBuffer[ buffer ] = ptr;
ptr += MV_BufferSize;
}
// Calculate pan table
MV_CalcPanTable();
MV_SetVolume( MV_MaxTotalVolume );
MV_FooMemory = sizeof(double) * MixBufferSize * numchannels + 1024;
status = USRHOOKS_GetMem( ( void ** )&ptr, MV_FooMemory);
if ( status != USRHOOKS_Ok )
{
USRHOOKS_FreeMem( MV_Voices );
MV_Voices = NULL;
MV_TotalMemory = 0;
MV_SetErrorCode( MV_NoMem );
return( MV_Error);
}
MV_FooBuffer = ptr;
// Start the playback engine
status = MV_StartPlayback();
if ( status != MV_Ok )
{
// Preserve error code while we shutdown.
status = MV_ErrorCode;
MV_Shutdown();
MV_SetErrorCode( status );
return( MV_Error );
}
if ( MV_TestPlayback() != MV_Ok )
{
status = MV_ErrorCode;
MV_Shutdown();
MV_SetErrorCode( status );
return( MV_Error );
}
return( MV_Ok );
}
/*---------------------------------------------------------------------
Function: MV_Shutdown
Restore any resources allocated by Multivoc back to the system.
---------------------------------------------------------------------*/
int MV_Shutdown
(
void
)
{
int buffer;
if ( !MV_Installed )
{
return( MV_Ok );
}
MV_KillAllVoices();
MV_Installed = FALSE;
// Stop the sound playback engine
MV_StopPlayback();
// Free reverb buffer, if allocated
MV_FPReverbFree();
//DeleteCriticalSection(&reverbCS);
SDL_DestroyMutex(reverbMutex);
// Shutdown the sound card
DSL_Shutdown();
// Free any voices we allocated
USRHOOKS_FreeMem( MV_FooBuffer );
MV_FooBuffer = NULL;
MV_FooMemory = 0;
USRHOOKS_FreeMem( MV_Voices );
MV_Voices = NULL;
MV_TotalMemory = 0;
LL_Reset( &VoiceList, next, prev );
LL_Reset( &VoicePool, next, prev );
MV_MaxVoices = 1;
// Release the descriptor from our mix buffer
DPMI_FreeDOSMemory( MV_BufferDescriptor );
for( buffer = 0; buffer < NumberOfBuffers; buffer++ )
{
MV_MixBuffer[ buffer ] = NULL;
}
return( MV_Ok );
}
void ClearBuffer_DW( void *ptr, unsigned data, int length )
{
unsigned *d = (unsigned *)ptr;
while (length--) {
*d = data;
d++;
}
}