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a_multiv.c
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/*
Copyright (C) 1994-1995 Apogee Software, Ltd.
Copyright (C) 2023 Frenkel Smeijers
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 <dos.h>
#include <time.h>
#include "id_heads.h"
#include "dmx.h"
#include "a_blast.h"
#include "a_dma.h"
#include "a_inter.h"
#include "a_ll_man.h"
#include "a_multiv.h"
enum MV_Errors
{
MV_Error = -1,
MV_Ok = 0,
MV_UnsupportedCard,
MV_NotInstalled,
MV_NoVoices,
MV_NoMem,
MV_VoiceNotFound,
MV_BlasterError,
MV_DMAFailure
};
typedef enum
{
NoMoreData,
KeepPlaying
} playbackstatus;
typedef struct VoiceNode
{
struct VoiceNode *next;
struct VoiceNode *prev;
void ( *mix )( void );
uint8_t *NextBlock;
uint32_t BlockLength;
uint32_t FixedPointBufferSize;
uint8_t *sound;
uint32_t length;
uint32_t SamplingRate;
uint32_t RateScale;
uint32_t position;
boolean Playing;
int32_t handle;
int32_t priority;
int16_t *LeftVolume;
int16_t *RightVolume;
} VoiceNode;
static playbackstatus MV_GetNextRawBlock(VoiceNode *voice);
typedef struct
{
VoiceNode *start;
VoiceNode *end;
} VList;
#define MV_NumVoices 8
typedef uint8_t HARSH_CLIP_TABLE_8[ MV_NumVoices * 256 ];
void MV_Mix8BitMono(void);
void MV_Mix8BitStereo(void);
void MV_Mix16BitMono(void);
void MV_Mix16BitStereo(void);
#define IS_QUIET( ptr ) ( ( void * )( ptr ) == ( void * )&MV_VolumeTable[ 0 ] )
#define MV_MaxVolume 63
//static signed short MV_VolumeTable[ MV_MaxVolume + 1 ][ 256 ];
static int16_t MV_VolumeTable[ 63 + 1 ][ 256 ];
static boolean MV_Installed = false;
static int32_t MV_SoundCard = AHW_SOUND_BLASTER;
static int32_t MV_MaxVoices = 1;
#define MixBufferSize 256
#define NumberOfBuffers 16
#define TotalBufferSize (MixBufferSize * NumberOfBuffers)
static int32_t MV_BufferSize = MixBufferSize;
static int32_t MV_NumberOfBuffers = NumberOfBuffers;
static int32_t MV_MixMode = MONO_8BIT;
static int32_t MV_Channels = 1;
static int32_t MV_Bits = 8;
#define SILENCE_16BIT 0
#define SILENCE_8BIT 0x80808080
static int32_t MV_Silence = SILENCE_8BIT;
static boolean MV_SwapLeftRight = false;
static int32_t MV_RequestedMixRate;
static int32_t MV_MixRate;
static int32_t MV_DMAChannel = -1;
static int32_t MV_BuffShift;
static int32_t MV_TotalMemory;
static int MV_BufferDescriptor;
static boolean MV_BufferEmpty[NumberOfBuffers];
static uint8_t *MV_MixBuffer[NumberOfBuffers + 1];
static VoiceNode *MV_Voices = NULL;
static volatile VList VoiceList = { NULL, NULL };
static volatile VList VoicePool = { NULL, NULL };
#define MV_MinVoiceHandle 1
static int32_t MV_MixPage = 0;
static int32_t MV_VoiceHandle = MV_MinVoiceHandle;
uint8_t *MV_HarshClipTable __attribute__ ((externally_visible));
uint8_t *MV_MixDestination __attribute__ ((externally_visible));
uint32_t MV_MixPosition __attribute__ ((externally_visible));
int16_t *MV_LeftVolume __attribute__ ((externally_visible));
int16_t *MV_RightVolume __attribute__ ((externally_visible));
int32_t MV_SampleSize __attribute__ ((externally_visible)) = 1;
int32_t MV_RightChannelOffset __attribute__ ((externally_visible));
static int32_t MV_ErrorCode = MV_Ok;
#define MV_SetErrorCode( status ) \
MV_ErrorCode = ( status )
/*---------------------------------------------------------------------
Function: MV_Mix
Mixes the sound into the buffer.
---------------------------------------------------------------------*/
uint32_t MV_Position __attribute__ ((externally_visible));
uint32_t MV_Rate __attribute__ ((externally_visible));
uint8_t *MV_Start __attribute__ ((externally_visible));
uint32_t MV_Length __attribute__ ((externally_visible));
static void MV_Mix(VoiceNode *voice, int32_t buffer)
{
int32_t length;
uint32_t FixedPointBufferSize;
if ((voice->length == 0) && (MV_GetNextRawBlock(voice) != KeepPlaying))
return;
length = MixBufferSize;
FixedPointBufferSize = voice->FixedPointBufferSize;
MV_MixDestination = MV_MixBuffer[buffer];
MV_LeftVolume = voice->LeftVolume;
MV_RightVolume = voice->RightVolume;
if ((MV_Channels == 2) && (IS_QUIET(MV_LeftVolume)))
{
MV_LeftVolume = MV_RightVolume;
MV_MixDestination += MV_RightChannelOffset;
}
// Add this voice to the mix
while (length > 0)
{
MV_Start = voice->sound;
MV_Rate = voice->RateScale;
MV_Position = voice->position;
// Check if the last sample in this buffer would be
// beyond the length of the sample block
if ((MV_Position + FixedPointBufferSize) >= voice->length)
{
if (MV_Position < voice->length)
MV_Length = (voice->length - MV_Position + MV_Rate - 1) / MV_Rate;
else
{
MV_GetNextRawBlock(voice);
return;
}
}
else
MV_Length = length;
voice->mix();
if (MV_Length & 1)
{
MV_MixPosition += MV_Rate;
MV_Length -= 1;
}
voice->position = MV_MixPosition;
length -= MV_Length;
if (voice->position >= voice->length)
{
// Get the next block of sound
if (MV_GetNextRawBlock(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.
---------------------------------------------------------------------*/
static void MV_PlayVoice(VoiceNode *voice)
{
uint32_t flags = DisableInterrupts();
LL_AddToTail(VoiceNode, &VoiceList, voice);
RestoreInterrupts(flags);
}
/*---------------------------------------------------------------------
Function: MV_StopVoice
Removes the voice from the play list and adds it to the free list.
---------------------------------------------------------------------*/
static void MV_StopVoice(VoiceNode *voice)
{
uint32_t flags = DisableInterrupts();
// move the voice from the play list to the free list
LL_Remove(VoiceNode, &VoiceList, voice);
LL_AddToTail(VoiceNode, &VoicePool, voice);
RestoreInterrupts(flags);
}
static void ClearBuffer_DW(void *ptr, uint32_t data, int32_t length)
{
int32_t i;
for (i = 0; i < length; i++)
((uint32_t *)ptr)[i] = data;
}
/*---------------------------------------------------------------------
Function: MV_ServiceVoc
Starts playback of the waiting buffer and mixes the next one.
---------------------------------------------------------------------*/
static void MV_ServiceVoc(void)
{
VoiceNode *voice;
VoiceNode *next;
uint8_t *buffer;
if (MV_DMAChannel >= 0)
{
// Get the currently playing buffer
buffer = DMA_GetCurrentPos(MV_DMAChannel);
MV_MixPage = (uint32_t)(buffer - MV_MixBuffer[0]);
MV_MixPage >>= MV_BuffShift;
}
// Toggle which buffer we'll mix next
MV_MixPage++;
if (MV_MixPage >= MV_NumberOfBuffers)
MV_MixPage -= MV_NumberOfBuffers;
// Initialize buffer
//Commented out so that the buffer is always cleared.
//This is so the guys at Echo Speech can mix into the
//buffer even when no sounds are playing.
if (!MV_BufferEmpty[MV_MixPage])
{
ClearBuffer_DW(MV_MixBuffer[MV_MixPage], MV_Silence, MV_BufferSize >> 2);
MV_BufferEmpty[MV_MixPage] = true;
}
// Play any waiting voices
voice = VoiceList.start;
while (voice != NULL)
{
MV_BufferEmpty[MV_MixPage] = false;
MV_Mix(voice, MV_MixPage);
next = voice->next;
// Is this voice done?
if (!voice->Playing)
MV_StopVoice(voice);
voice = next;
}
}
/*---------------------------------------------------------------------
Function: MV_GetNextRawBlock
Controls playback of demand fed data.
---------------------------------------------------------------------*/
static playbackstatus MV_GetNextRawBlock(VoiceNode *voice)
{
if (voice->BlockLength == 0)
{
voice->Playing = false;
return NoMoreData;
} else {
voice->sound = voice->NextBlock;
voice->position -= voice->length;
voice->length = voice->BlockLength > 0x8000 ? 0x8000 : voice->BlockLength;
voice->NextBlock += voice->length;
voice->BlockLength -= voice->length;
voice->length <<= 16;
return KeepPlaying;
}
}
/*---------------------------------------------------------------------
Function: MV_GetVoice
Locates the voice with the specified handle.
---------------------------------------------------------------------*/
static VoiceNode *MV_GetVoice(int32_t handle)
{
VoiceNode *voice;
uint32_t flags = DisableInterrupts();
voice = VoiceList.start;
while (voice != NULL)
{
if (handle == voice->handle)
break;
voice = voice->next;
}
RestoreInterrupts(flags);
if (voice == NULL)
MV_SetErrorCode(MV_VoiceNotFound);
return voice;
}
/*---------------------------------------------------------------------
Function: MV_VoicePlaying
Checks if the voice associated with the specified handle is
playing.
---------------------------------------------------------------------*/
boolean MV_VoicePlaying(int32_t handle)
{
VoiceNode *voice;
if (!MV_Installed)
{
MV_SetErrorCode(MV_NotInstalled);
return false;
}
voice = MV_GetVoice(handle);
return voice != NULL;
}
/*---------------------------------------------------------------------
Function: MV_KillAllVoices
Stops output of all currently active voices.
---------------------------------------------------------------------*/
static void MV_KillAllVoices(void)
{
if (!MV_Installed)
{
MV_SetErrorCode(MV_NotInstalled);
return;
}
// Remove all the voices from the list
while (VoiceList.start != NULL)
{
MV_Kill(VoiceList.start->handle);
}
}
/*---------------------------------------------------------------------
Function: MV_Kill
Stops output of the voice associated with the specified handle.
---------------------------------------------------------------------*/
void MV_Kill(int32_t handle)
{
VoiceNode *voice;
uint32_t flags;
if (!MV_Installed)
{
MV_SetErrorCode(MV_NotInstalled);
return;
}
flags = DisableInterrupts();
voice = MV_GetVoice(handle);
if (voice == NULL)
MV_SetErrorCode(MV_VoiceNotFound);
else
MV_StopVoice(voice);
RestoreInterrupts(flags);
}
/*---------------------------------------------------------------------
Function: MV_AllocVoice
Retrieve an inactive or lower priority voice for output.
---------------------------------------------------------------------*/
static VoiceNode *MV_AllocVoice(int32_t priority)
{
VoiceNode *voice;
VoiceNode *node;
uint32_t flags = DisableInterrupts();
// Check if we have any free voices
if (LL_Empty(&VoicePool))
{
// check if we have a higher priority than a voice that is playing.
voice = node = VoiceList.start;
while (node != NULL)
{
if (node->priority < voice->priority)
voice = node;
node = node->next;
}
if (priority >= voice->priority)
MV_Kill( voice->handle );
}
// Check if any voices are in the voice pool
if (LL_Empty(&VoicePool))
{
// No free voices
RestoreInterrupts(flags);
return NULL;
}
voice = VoicePool.start;
LL_Remove(VoiceNode, &VoicePool, voice);
RestoreInterrupts(flags);
// 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: PITCH_GetScale
Returns a fixed-point value to scale number the specified amount.
---------------------------------------------------------------------*/
#define MAXDETUNE 25
static const uint32_t PitchTable[ 12 ][ MAXDETUNE ] =
{
{ 0x10000, 0x10097, 0x1012f, 0x101c7, 0x10260, 0x102f9, 0x10392, 0x1042c,
0x104c6, 0x10561, 0x105fb, 0x10696, 0x10732, 0x107ce, 0x1086a, 0x10907,
0x109a4, 0x10a41, 0x10adf, 0x10b7d, 0x10c1b, 0x10cba, 0x10d59, 0x10df8,
0x10e98 },
{ 0x10f38, 0x10fd9, 0x1107a, 0x1111b, 0x111bd, 0x1125f, 0x11302, 0x113a5,
0x11448, 0x114eb, 0x1158f, 0x11634, 0x116d8, 0x1177e, 0x11823, 0x118c9,
0x1196f, 0x11a16, 0x11abd, 0x11b64, 0x11c0c, 0x11cb4, 0x11d5d, 0x11e06,
0x11eaf },
{ 0x11f59, 0x12003, 0x120ae, 0x12159, 0x12204, 0x122b0, 0x1235c, 0x12409,
0x124b6, 0x12563, 0x12611, 0x126bf, 0x1276d, 0x1281c, 0x128cc, 0x1297b,
0x12a2b, 0x12adc, 0x12b8d, 0x12c3e, 0x12cf0, 0x12da2, 0x12e55, 0x12f08,
0x12fbc },
{ 0x1306f, 0x13124, 0x131d8, 0x1328d, 0x13343, 0x133f9, 0x134af, 0x13566,
0x1361d, 0x136d5, 0x1378d, 0x13846, 0x138fe, 0x139b8, 0x13a72, 0x13b2c,
0x13be6, 0x13ca1, 0x13d5d, 0x13e19, 0x13ed5, 0x13f92, 0x1404f, 0x1410d,
0x141cb },
{ 0x1428a, 0x14349, 0x14408, 0x144c8, 0x14588, 0x14649, 0x1470a, 0x147cc,
0x1488e, 0x14951, 0x14a14, 0x14ad7, 0x14b9b, 0x14c5f, 0x14d24, 0x14dea,
0x14eaf, 0x14f75, 0x1503c, 0x15103, 0x151cb, 0x15293, 0x1535b, 0x15424,
0x154ee },
{ 0x155b8, 0x15682, 0x1574d, 0x15818, 0x158e4, 0x159b0, 0x15a7d, 0x15b4a,
0x15c18, 0x15ce6, 0x15db4, 0x15e83, 0x15f53, 0x16023, 0x160f4, 0x161c5,
0x16296, 0x16368, 0x1643a, 0x1650d, 0x165e1, 0x166b5, 0x16789, 0x1685e,
0x16934 },
{ 0x16a09, 0x16ae0, 0x16bb7, 0x16c8e, 0x16d66, 0x16e3e, 0x16f17, 0x16ff1,
0x170ca, 0x171a5, 0x17280, 0x1735b, 0x17437, 0x17513, 0x175f0, 0x176ce,
0x177ac, 0x1788a, 0x17969, 0x17a49, 0x17b29, 0x17c09, 0x17cea, 0x17dcc,
0x17eae },
{ 0x17f91, 0x18074, 0x18157, 0x1823c, 0x18320, 0x18406, 0x184eb, 0x185d2,
0x186b8, 0x187a0, 0x18888, 0x18970, 0x18a59, 0x18b43, 0x18c2d, 0x18d17,
0x18e02, 0x18eee, 0x18fda, 0x190c7, 0x191b5, 0x192a2, 0x19391, 0x19480,
0x1956f },
{ 0x1965f, 0x19750, 0x19841, 0x19933, 0x19a25, 0x19b18, 0x19c0c, 0x19d00,
0x19df4, 0x19ee9, 0x19fdf, 0x1a0d5, 0x1a1cc, 0x1a2c4, 0x1a3bc, 0x1a4b4,
0x1a5ad, 0x1a6a7, 0x1a7a1, 0x1a89c, 0x1a998, 0x1aa94, 0x1ab90, 0x1ac8d,
0x1ad8b },
{ 0x1ae89, 0x1af88, 0x1b088, 0x1b188, 0x1b289, 0x1b38a, 0x1b48c, 0x1b58f,
0x1b692, 0x1b795, 0x1b89a, 0x1b99f, 0x1baa4, 0x1bbaa, 0x1bcb1, 0x1bdb8,
0x1bec0, 0x1bfc9, 0x1c0d2, 0x1c1dc, 0x1c2e6, 0x1c3f1, 0x1c4fd, 0x1c609,
0x1c716 },
{ 0x1c823, 0x1c931, 0x1ca40, 0x1cb50, 0x1cc60, 0x1cd70, 0x1ce81, 0x1cf93,
0x1d0a6, 0x1d1b9, 0x1d2cd, 0x1d3e1, 0x1d4f6, 0x1d60c, 0x1d722, 0x1d839,
0x1d951, 0x1da69, 0x1db82, 0x1dc9c, 0x1ddb6, 0x1ded1, 0x1dfec, 0x1e109,
0x1e225 },
{ 0x1e343, 0x1e461, 0x1e580, 0x1e6a0, 0x1e7c0, 0x1e8e0, 0x1ea02, 0x1eb24,
0x1ec47, 0x1ed6b, 0x1ee8f, 0x1efb4, 0x1f0d9, 0x1f1ff, 0x1f326, 0x1f44e,
0x1f576, 0x1f69f, 0x1f7c9, 0x1f8f3, 0x1fa1e, 0x1fb4a, 0x1fc76, 0x1fda3,
0x1fed1 }
};
static uint32_t PITCH_GetScale(int32_t pitchoffset)
{
uint32_t scale;
int32_t octaveshift;
int32_t noteshift;
int32_t note;
int32_t detune;
if (pitchoffset == 0)
return PitchTable[0][0];
noteshift = pitchoffset % 1200;
if (noteshift < 0)
noteshift += 1200;
note = noteshift / 100;
detune = (noteshift % 100) / (100 / MAXDETUNE);
octaveshift = (pitchoffset - noteshift) / 1200;
if (detune < 0)
{
detune += (100 / MAXDETUNE);
note--;
if (note < 0)
{
note += 12;
octaveshift--;
}
}
scale = PitchTable[note][detune];
if (octaveshift < 0)
scale >>= -octaveshift;
else
scale <<= octaveshift;
return scale;
}
/*---------------------------------------------------------------------
Function: MV_SetVoicePitch
Sets the pitch for the specified voice.
---------------------------------------------------------------------*/
static void MV_SetVoicePitch(VoiceNode *voice, uint32_t rate, int32_t pitchoffset)
{
voice->SamplingRate = rate;
voice->RateScale = (rate * PITCH_GetScale(pitchoffset)) / 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.
---------------------------------------------------------------------*/
static int16_t *MV_GetVolumeTable(int32_t vol)
{
int16_t *table;
if (vol > 255)
vol = 255;
else if (vol < 0)
vol = 0;
vol = vol >> 2;
table = (int16_t *) &MV_VolumeTable[vol];
return table;
}
/*---------------------------------------------------------------------
Function: MV_SetVoiceMixMode
Selects which method should be used to mix the voice.
---------------------------------------------------------------------*/
#define T_SIXTEENBIT_STEREO 0
#define T_8BITS 1
#define T_MONO 2
#define T_LEFTQUIET 8
#define T_RIGHTQUIET 16
#define T_DEFAULT T_SIXTEENBIT_STEREO
static void MV_SetVoiceMixMode(VoiceNode *voice)
{
uint32_t flags;
int32_t test;
flags = DisableInterrupts();
test = T_DEFAULT;
if (MV_Bits == 8)
test |= T_8BITS;
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_8BITS | T_MONO:
voice->mix = MV_Mix8BitMono;
break;
case T_8BITS | T_LEFTQUIET:
MV_LeftVolume = MV_RightVolume;
voice->mix = MV_Mix8BitMono;
break;
case T_8BITS | T_RIGHTQUIET:
voice->mix = MV_Mix8BitMono;
break;
case T_8BITS:
voice->mix = MV_Mix8BitStereo;
break;
case T_MONO:
voice->mix = MV_Mix16BitMono;
break;
case T_LEFTQUIET:
MV_LeftVolume = MV_RightVolume;
voice->mix = MV_Mix16BitMono;
break;
case T_RIGHTQUIET:
voice->mix = MV_Mix16BitMono;
break;
case T_SIXTEENBIT_STEREO:
voice->mix = MV_Mix16BitStereo;
break;
default:
voice->mix = MV_Mix8BitMono;
}
RestoreInterrupts(flags);
}
/*---------------------------------------------------------------------
Function: MV_SetVoiceVolume
Sets the stereo and mono volume level of the voice associated
with the specified handle.
---------------------------------------------------------------------*/
static void MV_SetVoiceVolume(VoiceNode *voice, int32_t vol, int32_t left, int32_t 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_SetOrigin
Sets the stereo and mono volume level of the voice associated with the specified handle.
Sets the pitch for the voice associated with the specified handle.
---------------------------------------------------------------------*/
void MV_SetOrigin(int32_t handle, int32_t pitchoffset, int32_t vol, int32_t left, int32_t right)
{
VoiceNode *voice;
if (!MV_Installed)
{
MV_SetErrorCode(MV_NotInstalled);
return;
}
voice = MV_GetVoice(handle);
if (voice == NULL)
MV_SetErrorCode(MV_VoiceNotFound);
else {
MV_SetVoicePitch(voice, voice->SamplingRate, pitchoffset);
MV_SetVoiceVolume(voice, vol, left, right);
}
}
/*---------------------------------------------------------------------
Function: MV_SetMixMode
Prepares Multivoc to play stereo of mono digitized sounds.
---------------------------------------------------------------------*/
static void MV_SetMixMode(void)
{
if (!MV_Installed)
{
MV_SetErrorCode(MV_NotInstalled);
return;
}
switch(MV_SoundCard)
{
case AHW_SOUND_BLASTER:
MV_MixMode = BLASTER_SetMixMode(STEREO | SIXTEEN_BIT);
break;
}
MV_Channels = MV_MixMode & STEREO ? 2 : 1;
MV_Bits = MV_MixMode & SIXTEEN_BIT ? 16 : 8;
MV_BuffShift = 7 + MV_Channels;
MV_SampleSize = 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_RightChannelOffset = MV_SampleSize / 2;
}
/*---------------------------------------------------------------------
Function: MV_StartPlayback
Starts the sound playback engine.
---------------------------------------------------------------------*/
static int32_t MV_StartPlayback(void)
{
int32_t status;
int32_t 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;
// Start playback
switch (MV_SoundCard)
{
case AHW_SOUND_BLASTER:
status = BLASTER_BeginBufferedPlayback(MV_MixBuffer[0], TotalBufferSize, MV_NumberOfBuffers, MV_RequestedMixRate, MV_MixMode, MV_ServiceVoc);
if (status != BLASTER_Ok)
{
MV_SetErrorCode(MV_BlasterError);
return MV_Error;
}
MV_MixRate = BLASTER_GetPlaybackRate();
MV_DMAChannel = BLASTER_GetDMAChannel();
break;
}
return MV_Ok;
}
/*---------------------------------------------------------------------
Function: MV_StopPlayback
Stops the sound playback engine.
---------------------------------------------------------------------*/
static void MV_StopPlayback(void)
{
VoiceNode *voice;
VoiceNode *next;
uint32_t flags;
// Stop sound playback
switch (MV_SoundCard)
{
case AHW_SOUND_BLASTER:
BLASTER_StopPlayback();
break;
}
// Make sure all callbacks are done.
flags = DisableInterrupts();
voice = VoiceList.start;
while (voice != NULL)
{
next = voice->next;
MV_StopVoice(voice);
voice = next;
}
RestoreInterrupts(flags);
}
/*---------------------------------------------------------------------
Function: MV_PlayRaw
Begin playback of sound data with the given sound levels and
priority.
---------------------------------------------------------------------*/
int32_t MV_PlayRaw(uint8_t *ptr, uint32_t length, uint32_t rate, int32_t pitchoffset, int32_t vol, int32_t left, int32_t right, int32_t priority)
{
VoiceNode *voice;
if (!MV_Installed)
{
MV_SetErrorCode(MV_NotInstalled);
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->Playing = true;
voice->NextBlock = ptr;
voice->position = 0;
voice->BlockLength = length;
voice->length = 0;
voice->next = NULL;
voice->prev = NULL;
voice->priority = priority;
MV_SetVoicePitch(voice, rate, pitchoffset);
MV_SetVoiceVolume(voice, vol, left, right);
MV_PlayVoice(voice);
return voice->handle;
}
/*---------------------------------------------------------------------
Function: MV_SetVolume
Sets the volume of digitized sound playback.
Create the table used to convert sound data to a specific volume
level.
---------------------------------------------------------------------*/
static void MV_SetVolume(void)
{
int32_t volume;
int32_t val;
int32_t i;
for (volume = 0; volume < 128; volume++)
{
MV_HarshClipTable[volume] = 0;
MV_HarshClipTable[volume + 384] = 255;
}
for (volume = 0; volume < 256; volume++)
MV_HarshClipTable[volume + 128] = volume;
// For each volume level, create a translation table with the
// appropriate volume calculated.
for (volume = 0; volume <= MV_MaxVolume; volume++)