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soundux.cpp
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soundux.cpp
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/*******************************************************************************
Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
(c) Copyright 1996 - 2003 Gary Henderson ([email protected]) and
Jerremy Koot ([email protected])
(c) Copyright 2002 - 2003 Matthew Kendora and
Brad Jorsch ([email protected])
C4 x86 assembler and some C emulation code
(c) Copyright 2000 - 2003 zsKnight ([email protected]),
_Demo_ ([email protected]), and
Nach ([email protected])
C4 C++ code
(c) Copyright 2003 Brad Jorsch
DSP-1 emulator code
(c) Copyright 1998 - 2003 Ivar ([email protected]), _Demo_, Gary Henderson,
John Weidman ([email protected]),
neviksti ([email protected]), and
Kris Bleakley ([email protected])
DSP-2 emulator code
(c) Copyright 2003 Kris Bleakley, John Weidman, neviksti, Matthew Kendora, and
Lord Nightmare ([email protected]
OBC1 emulator code
(c) Copyright 2001 - 2003 zsKnight, pagefault ([email protected])
Ported from x86 assembler to C by sanmaiwashi
SPC7110 and RTC C++ emulator code
(c) Copyright 2002 Matthew Kendora with research by
zsKnight, John Weidman, and Dark Force
S-RTC C emulator code
(c) Copyright 2001 John Weidman
Super FX x86 assembler emulator code
(c) Copyright 1998 - 2003 zsKnight, _Demo_, and pagefault
Super FX C emulator code
(c) Copyright 1997 - 1999 Ivar and Gary Henderson.
Specific ports contains the works of other authors. See headers in
individual files.
Snes9x homepage: http://www.snes9x.com
Permission to use, copy, modify and distribute Snes9x in both binary and
source form, for non-commercial purposes, is hereby granted without fee,
providing that this license information and copyright notice appear with
all copies and any derived work.
This software is provided 'as-is', without any express or implied
warranty. In no event shall the authors be held liable for any damages
arising from the use of this software.
Snes9x is freeware for PERSONAL USE only. Commercial users should
seek permission of the copyright holders first. Commercial use includes
charging money for Snes9x or software derived from Snes9x.
The copyright holders request that bug fixes and improvements to the code
should be forwarded to them so everyone can benefit from the modifications
in future versions.
Super NES and Super Nintendo Entertainment System are trademarks of
Nintendo Co., Limited and its subsidiary companies.
*******************************************************************************/
#ifdef __DJGPP__
#include <allegro.h>
#undef TRUE
#endif
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#define CLIP16(v) \
if ((v) < -32768) \
(v) = -32768; \
else \
if ((v) > 32767) \
(v) = 32767
#define CLIP16_latch(v,l) \
if ((v) < -32768) \
{ (v) = -32768; (l)++; }\
else \
if ((v) > 32767) \
{ (v) = 32767; (l)++; }
#define CLIP24(v) \
if ((v) < -8388608) \
(v) = -8388608; \
else \
if ((v) > 8388607) \
(v) = 8388607
#define CLIP8(v) \
if ((v) < -128) \
(v) = -128; \
else \
if ((v) > 127) \
(v) = 127
#include "snes9x.h"
#include "apu.h"
#include "soundux.h"
#include "memmap.h"
#include "cpuexec.h"
extern int Echo [24000];
extern int DummyEchoBuffer [SOUND_BUFFER_SIZE];
extern int MixBuffer [SOUND_BUFFER_SIZE];
extern int EchoBuffer [SOUND_BUFFER_SIZE];
extern int FilterTaps [8];
extern unsigned long Z;
extern int Loop [16];
extern long FilterValues[4][2];
extern int NoiseFreq [32];
#undef ABS
#define ABS(a) ((a) < 0 ? -(a) : (a))
#define FIXED_POINT 0x10000UL
#define FIXED_POINT_REMAINDER 0xffffUL
#define FIXED_POINT_SHIFT 16
#define VOL_DIV8 0x8000
#define VOL_DIV16 0x0080
#define ENVX_SHIFT 24
extern "C" void DecodeBlockAsm (int8 *, int16 *, int32 *, int32 *);
extern "C" void DecodeBlockAsm2 (int8 *, int16 *, int32 *, int32 *);
// F is channel's current frequency and M is the 16-bit modulation waveform
// from the previous channel multiplied by the current envelope volume level.
#define PITCH_MOD(F,M) ((F) * ((((unsigned long) (M)) + 0x800000) >> 16) >> 7)
//#define PITCH_MOD(F,M) ((F) * ((((M) & 0x7fffff) >> 14) + 1) >> 8)
#define LAST_SAMPLE 0xffffff
#define JUST_PLAYED_LAST_SAMPLE(c) ((c)->sample_pointer >= LAST_SAMPLE)
STATIC inline uint8 *S9xGetSampleAddress (int sample_number)
{
uint32 addr = (((APU.DSP[APU_DIR] << 8) + (sample_number << 2)) & 0xffff);
return (IAPU.RAM + addr);
}
void S9xAPUSetEndOfSample (int i, Channel *ch)
{
ch->state = SOUND_SILENT;
ch->mode = MODE_NONE;
APU.DSP [APU_ENDX] |= 1 << i;
APU.DSP [APU_KON] &= ~(1 << i);
APU.DSP [APU_KOFF] &= ~(1 << i);
APU.KeyedChannels &= ~(1 << i);
}
void S9xAPUSetEndX (int ch)
{
APU.DSP [APU_ENDX] |= 1 << ch;
}
void S9xSetEnvRate (Channel *ch, unsigned long rate, int direction, int target)
{
ch->envx_target = target;
if (rate == ~0UL)
{
ch->direction = 0;
rate = 0;
}
else
ch->direction = direction;
static int steps [] =
{
// 0, 64, 1238, 1238, 256, 1, 64, 109, 64, 1238
0, 64, 619, 619, 128, 1, 64, 55, 64, 619
};
if (rate == 0 || so.playback_rate == 0)
ch->erate = 0;
else
{
ch->erate = (unsigned long)
(((int64) FIXED_POINT * 1000 * steps [ch->state]) /
(rate * so.playback_rate));
}
}
void S9xSetEnvelopeRate (int channel, unsigned long rate, int direction,
int target)
{
S9xSetEnvRate (&SoundData.channels [channel], rate, direction, target);
}
#ifndef _ZAURUS
void S9xSetSoundVolume (int channel, short volume_left, short volume_right)
{
Channel *ch = &SoundData.channels[channel];
if (!so.stereo)
volume_left = (ABS(volume_right) + ABS(volume_left)) / 2;
ch->volume_left = volume_left;
ch->volume_right = volume_right;
ch-> left_vol_level = (ch->envx * volume_left) / 128;
ch->right_vol_level = (ch->envx * volume_right) / 128;
}
void S9xSetMasterVolume (short volume_left, short volume_right)
{
if (Settings.DisableMasterVolume)
{
SoundData.master_volume_left = 127;
SoundData.master_volume_right = 127;
SoundData.master_volume [0] = SoundData.master_volume [1] = 256;
}
else
{
if (!so.stereo)
volume_left = (ABS (volume_right) + ABS (volume_left)) / 2;
SoundData.master_volume_left = volume_left;
SoundData.master_volume_right = volume_right;
SoundData.master_volume [Settings.ReverseStereo] = volume_left;
SoundData.master_volume [1 ^ Settings.ReverseStereo] = volume_right;
}
}
void S9xSetEchoVolume (short volume_left, short volume_right)
{
if (!so.stereo)
volume_left = (ABS (volume_right) + ABS (volume_left)) / 2;
SoundData.echo_volume_left = volume_left;
SoundData.echo_volume_right = volume_right;
SoundData.echo_volume [Settings.ReverseStereo] = volume_left;
SoundData.echo_volume [1 ^ Settings.ReverseStereo] = volume_right;
}
#endif
void S9xSetEchoEnable (uint8 byte)
{
SoundData.echo_channel_enable = byte;
if (!SoundData.echo_write_enabled || Settings.DisableSoundEcho)
byte = 0;
if (byte && !SoundData.echo_enable)
{
memset (Echo, 0, sizeof (Echo));
memset (Loop, 0, sizeof (Loop));
}
SoundData.echo_enable = byte;
for (int i = 0; i < 8; i++)
{
if (byte & (1 << i))
SoundData.channels [i].echo_buf_ptr = EchoBuffer;
else
SoundData.channels [i].echo_buf_ptr = DummyEchoBuffer;
}
}
void S9xSetEchoFeedback (int feedback)
{
CLIP8(feedback);
SoundData.echo_feedback = feedback;
}
void S9xSetEchoDelay (int delay)
{
SoundData.echo_buffer_size = (512 * delay * so.playback_rate) / 32000;
if (so.stereo)
SoundData.echo_buffer_size <<= 1;
if (SoundData.echo_buffer_size)
SoundData.echo_ptr %= SoundData.echo_buffer_size;
else
SoundData.echo_ptr = 0;
S9xSetEchoEnable (APU.DSP [APU_EON]);
}
void S9xSetEchoWriteEnable (uint8 byte)
{
SoundData.echo_write_enabled = byte;
S9xSetEchoDelay (APU.DSP [APU_EDL] & 15);
}
void S9xSetFrequencyModulationEnable (uint8 byte)
{
SoundData.pitch_mod = byte & ~1;
}
void S9xSetSoundKeyOff (int channel)
{
Channel *ch = &SoundData.channels[channel];
if (ch->state != SOUND_SILENT)
{
ch->state = SOUND_RELEASE;
ch->mode = MODE_RELEASE;
S9xSetEnvRate (ch, 8, -1, 0);
}
}
void S9xFixSoundAfterSnapshotLoad ()
{
SoundData.echo_write_enabled = !(APU.DSP [APU_FLG] & 0x20);
SoundData.echo_channel_enable = APU.DSP [APU_EON];
S9xSetEchoDelay (APU.DSP [APU_EDL] & 0xf);
S9xSetEchoFeedback ((signed char) APU.DSP [APU_EFB]);
S9xSetFilterCoefficient (0, (signed char) APU.DSP [APU_C0]);
S9xSetFilterCoefficient (1, (signed char) APU.DSP [APU_C1]);
S9xSetFilterCoefficient (2, (signed char) APU.DSP [APU_C2]);
S9xSetFilterCoefficient (3, (signed char) APU.DSP [APU_C3]);
S9xSetFilterCoefficient (4, (signed char) APU.DSP [APU_C4]);
S9xSetFilterCoefficient (5, (signed char) APU.DSP [APU_C5]);
S9xSetFilterCoefficient (6, (signed char) APU.DSP [APU_C6]);
S9xSetFilterCoefficient (7, (signed char) APU.DSP [APU_C7]);
for (int i = 0; i < 8; i++)
{
SoundData.channels[i].needs_decode = TRUE;
S9xSetSoundFrequency (i, SoundData.channels[i].hertz);
SoundData.channels [i].envxx = SoundData.channels [i].envx << ENVX_SHIFT;
SoundData.channels [i].next_sample = 0;
SoundData.channels [i].interpolate = 0;
SoundData.channels [i].previous [0] = (int32) SoundData.channels [i].previous16 [0];
SoundData.channels [i].previous [1] = (int32) SoundData.channels [i].previous16 [1];
}
SoundData.master_volume [Settings.ReverseStereo] = SoundData.master_volume_left;
SoundData.master_volume [1 ^ Settings.ReverseStereo] = SoundData.master_volume_right;
SoundData.echo_volume [Settings.ReverseStereo] = SoundData.echo_volume_left;
SoundData.echo_volume [1 ^ Settings.ReverseStereo] = SoundData.echo_volume_right;
IAPU.Scanline = 0;
}
void S9xSetFilterCoefficient (int tap, int value)
{
FilterTaps [tap & 7] = value;
SoundData.no_filter = (FilterTaps [0] == 127 || FilterTaps [0] == 0) &&
FilterTaps [1] == 0 &&
FilterTaps [2] == 0 &&
FilterTaps [3] == 0 &&
FilterTaps [4] == 0 &&
FilterTaps [5] == 0 &&
FilterTaps [6] == 0 &&
FilterTaps [7] == 0;
}
void S9xSetSoundADSR (int channel, int attack_rate, int decay_rate,
int sustain_rate, int sustain_level, int release_rate)
{
SoundData.channels[channel].attack_rate = attack_rate;
SoundData.channels[channel].decay_rate = decay_rate;
SoundData.channels[channel].sustain_rate = sustain_rate;
SoundData.channels[channel].release_rate = release_rate;
SoundData.channels[channel].sustain_level = sustain_level + 1;
switch (SoundData.channels[channel].state)
{
case SOUND_ATTACK:
S9xSetEnvRate (&SoundData.channels [channel], attack_rate, 1, 127);
// S9xSetEnvelopeRate (channel, attack_rate, 1, 127);
break;
case SOUND_DECAY:
S9xSetEnvRate (&SoundData.channels [channel], decay_rate, -1,
(MAX_ENVELOPE_HEIGHT * (sustain_level + 1)) >> 3);
// S9xSetEnvelopeRate (channel, decay_rate, -1,
// (MAX_ENVELOPE_HEIGHT * (sustain_level + 1)) >> 3);
break;
case SOUND_SUSTAIN:
S9xSetEnvRate (&SoundData.channels [channel], sustain_rate, -1, 0);
// S9xSetEnvelopeRate (channel, sustain_rate, -1, 0);
break;
}
}
void S9xSetEnvelopeHeight (int channel, int level)
{
Channel *ch = &SoundData.channels[channel];
ch->envx = level;
ch->envxx = level << ENVX_SHIFT;
ch->left_vol_level = (level * ch->volume_left) / 128;
ch->right_vol_level = (level * ch->volume_right) / 128;
if (ch->envx == 0 && ch->state != SOUND_SILENT && ch->state != SOUND_GAIN)
{
S9xAPUSetEndOfSample (channel, ch);
}
}
int S9xGetEnvelopeHeight (int channel)
{
if ((Settings.SoundEnvelopeHeightReading ||
SNESGameFixes.SoundEnvelopeHeightReading2) &&
SoundData.channels[channel].state != SOUND_SILENT &&
SoundData.channels[channel].state != SOUND_GAIN)
{
return (SoundData.channels[channel].envx);
}
//siren fix from XPP
if (SNESGameFixes.SoundEnvelopeHeightReading2 &&
SoundData.channels[channel].state != SOUND_SILENT)
{
return (SoundData.channels[channel].envx);
}
return (0);
}
#if 1
void S9xSetSoundSample (int, uint16)
{
}
#else
void S9xSetSoundSample (int channel, uint16 sample_number)
{
register Channel *ch = &SoundData.channels[channel];
if (ch->state != SOUND_SILENT &&
sample_number != ch->sample_number)
{
int keep = ch->state;
ch->state = SOUND_SILENT;
ch->sample_number = sample_number;
ch->loop = FALSE;
ch->needs_decode = TRUE;
ch->last_block = FALSE;
ch->previous [0] = ch->previous[1] = 0;
uint8 *dir = S9xGetSampleAddress (sample_number);
ch->block_pointer = READ_WORD (dir);
ch->sample_pointer = 0;
ch->state = keep;
}
}
#endif
void S9xSetSoundFrequency (int channel, int hertz)
{
if (so.playback_rate)
{
if (SoundData.channels[channel].type == SOUND_NOISE)
hertz = NoiseFreq [APU.DSP [APU_FLG] & 0x1f];
SoundData.channels[channel].frequency = (int)
(((int64) hertz * FIXED_POINT) / so.playback_rate);
if (Settings.FixFrequency)
{
SoundData.channels[channel].frequency =
(unsigned long) ((double) SoundData.channels[channel].frequency * 0.980);
}
}
}
#ifndef _ZAURUS
void S9xSetSoundHertz (int channel, int hertz)
{
SoundData.channels[channel].hertz = hertz;
S9xSetSoundFrequency (channel, hertz);
}
void S9xSetSoundType (int channel, int type_of_sound)
{
SoundData.channels[channel].type = type_of_sound;
}
#endif
bool8_32 S9xSetSoundMute (bool8_32 mute)
{
bool8_32 old = so.mute_sound;
so.mute_sound = mute;
return (old);
}
void AltDecodeBlock (Channel *ch)
{
if (ch->block_pointer >= 0x10000 - 9)
{
ch->last_block = TRUE;
ch->loop = FALSE;
ch->block = ch->decoded;
memset ((void *) ch->decoded, 0, sizeof (int16) * 16);
return;
}
signed char *compressed = (signed char *) &IAPU.RAM [ch->block_pointer];
unsigned char filter = *compressed;
if ((ch->last_block = filter & 1))
ch->loop = (filter & 2) != 0;
/*
#if defined(__MIPSEL__)
int16 *raw = ch->block = ch->decoded;
// if ((Settings.AltSampleDecode) == 1)
DecodeBlockAsm (compressed, raw, &ch->previous [0], &ch->previous [1]);
// else
// DecodeBlockAsm2 (compressed, raw, &ch->previous [0], &ch->previous [1]);
#else if (!defined (NOASM) && defined (__i386__) || defined (__i486__) ||\
defined (__i586__) || defined (__WIN32__) || defined (__DJGPP))
int16 *raw = ch->block = ch->decoded;
if (Settings.AltSampleDecode == 1)
DecodeBlockAsm (compressed, raw, &ch->previous [0], &ch->previous [1]);
else
DecodeBlockAsm2 (compressed, raw, &ch->previous [0], &ch->previous [1]);
#else
*/
int32 out;
unsigned char shift;
signed char sample1, sample2;
unsigned int i;
compressed++;
signed short *raw = ch->block = ch->decoded;
int32 prev0 = ch->previous [0];
int32 prev1 = ch->previous [1];
shift = filter >> 4;
switch ((filter >> 2) & 3)
{
case 0:
for (i = 8; i != 0; i--)
{
sample1 = *compressed++;
sample2 = sample1 << 4;
sample2 >>= 4;
sample1 >>= 4;
*raw++ = ((int32) sample1 << shift);
*raw++ = ((int32) sample2 << shift);
}
prev1 = *(raw - 2);
prev0 = *(raw - 1);
break;
case 1:
for (i = 8; i != 0; i--)
{
sample1 = *compressed++;
sample2 = sample1 << 4;
sample2 >>= 4;
sample1 >>= 4;
prev0 = (int16) prev0;
*raw++ = prev1 = ((int32) sample1 << shift) + prev0 - (prev0 >> 4);
prev1 = (int16) prev1;
*raw++ = prev0 = ((int32) sample2 << shift) + prev1 - (prev1 >> 4);
}
break;
case 2:
for (i = 8; i != 0; i--)
{
sample1 = *compressed++;
sample2 = sample1 << 4;
sample2 >>= 4;
sample1 >>= 4;
out = (sample1 << shift) - prev1 + (prev1 >> 4);
prev1 = (int16) prev0;
prev0 &= ~3;
*raw++ = prev0 = out + (prev0 << 1) - (prev0 >> 5) -
(prev0 >> 4);
out = (sample2 << shift) - prev1 + (prev1 >> 4);
prev1 = (int16) prev0;
prev0 &= ~3;
*raw++ = prev0 = out + (prev0 << 1) - (prev0 >> 5) -
(prev0 >> 4);
}
break;
case 3:
for (i = 8; i != 0; i--)
{
sample1 = *compressed++;
sample2 = sample1 << 4;
sample2 >>= 4;
sample1 >>= 4;
out = (sample1 << shift);
out = out - prev1 + (prev1 >> 3) + (prev1 >> 4);
prev1 = (int16) prev0;
prev0 &= ~3;
*raw++ = prev0 = out + (prev0 << 1) - (prev0 >> 3) -
(prev0 >> 4) - (prev1 >> 6);
out = (sample2 << shift);
out = out - prev1 + (prev1 >> 3) + (prev1 >> 4);
prev1 = (int16) prev0;
prev0 &= ~3;
*raw++ = prev0 = out + (prev0 << 1) - (prev0 >> 3) -
(prev0 >> 4) - (prev1 >> 6);
}
break;
}
ch->previous [0] = prev0;
ch->previous [1] = prev1;
//#endif
ch->block_pointer += 9;
}
#ifndef _ZAURUS
void AltDecodeBlock2 (Channel *ch)
{
int32 out;
unsigned char filter;
unsigned char shift;
signed char sample1, sample2;
unsigned char i;
if (ch->block_pointer > 0x10000 - 9)
{
ch->last_block = TRUE;
ch->loop = FALSE;
ch->block = ch->decoded;
memset ((void *) ch->decoded, 0, sizeof (int16) * 16);
return;
}
signed char *compressed = (signed char *) &IAPU.RAM [ch->block_pointer];
filter = *compressed;
if ((ch->last_block = filter & 1))
ch->loop = (filter & 2) != 0;
compressed++;
signed short *raw = ch->block = ch->decoded;
shift = filter >> 4;
int32 prev0 = ch->previous [0];
int32 prev1 = ch->previous [1];
if(shift > 12)
shift -= 4;
switch ((filter >> 2) & 3)
{
case 0:
for (i = 8; i != 0; i--)
{
sample1 = *compressed++;
sample2 = sample1 << 4;
//Sample 2 = Bottom Nibble, Sign Extended.
sample2 >>= 4;
//Sample 1 = Top Nibble, shifted down and Sign Extended.
sample1 >>= 4;
out = (int32)(sample1 << shift);
prev1 = prev0;
prev0 = out;
CLIP16(out);
*raw++ = (int16)out;
out = (int32)(sample2 << shift);
prev1 = prev0;
prev0 = out;
CLIP16(out);
*raw++ = (int16)out;
}
break;
case 1:
for (i = 8; i != 0; i--)
{
sample1 = *compressed++;
sample2 = sample1 << 4;
//Sample 2 = Bottom Nibble, Sign Extended.
sample2 >>= 4;
//Sample 1 = Top Nibble, shifted down and Sign Extended.
sample1 >>= 4;
out = (int32)(sample1 << shift);
out += (int32)((double)prev0 * 15/16);
prev1 = prev0;
prev0 = out;
CLIP16(out);
*raw++ = (int16)out;
out = (int32)(sample2 << shift);
out += (int32)((double)prev0 * 15/16);
prev1 = prev0;
prev0 = out;
CLIP16(out);
*raw++ = (int16)out;
}
break;
case 2:
for (i = 8; i != 0; i--)
{
sample1 = *compressed++;
sample2 = sample1 << 4;
//Sample 2 = Bottom Nibble, Sign Extended.
sample2 >>= 4;
//Sample 1 = Top Nibble, shifted down and Sign Extended.
sample1 >>= 4;
out = ((sample1 << shift) * 256 + (prev0 & ~0x2) * 488 - prev1 * 240) >> 8;
prev1 = prev0;
prev0 = (int16)out;
*raw++ = (int16)out;
out = ((sample2 << shift) * 256 + (prev0 & ~0x2) * 488 - prev1 * 240) >> 8;
prev1 = prev0;
prev0 = (int16)out;
*raw++ = (int16)out;
}
break;
case 3:
for (i = 8; i != 0; i--)
{
sample1 = *compressed++;
sample2 = sample1 << 4;
//Sample 2 = Bottom Nibble, Sign Extended.
sample2 >>= 4;
//Sample 1 = Top Nibble, shifted down and Sign Extended.
sample1 >>= 4;
out = (int32)(sample1 << shift);
out += (int32)((double)prev0 * 115/64 - (double)prev1 * 13/16);
prev1 = prev0;
prev0 = out;
CLIP16(out);
*raw++ = (int16)out;
out = (int32)(sample2 << shift);
out += (int32)((double)prev0 * 115/64 - (double)prev1 * 13/16);
prev1 = prev0;
prev0 = out;
CLIP16(out);
*raw++ = (int16)out;
}
break;
}
ch->previous [0] = prev0;
ch->previous [1] = prev1;
ch->block_pointer += 9;
}
#endif
void DecodeBlock (Channel *ch)
{
int32 out;
unsigned char filter;
unsigned char shift;
signed char sample1, sample2;
unsigned char i;
bool invalid_header;
if (Settings.AltSampleDecode)
{
// if (Settings.AltSampleDecode < 3)
AltDecodeBlock (ch);
// else
// AltDecodeBlock2 (ch);
return;
}
if (ch->block_pointer > 0x10000 - 9)
{
ch->last_block = TRUE;
ch->loop = FALSE;
ch->block = ch->decoded;
return;
}
signed char *compressed = (signed char *) &IAPU.RAM [ch->block_pointer];
filter = *compressed;
if ((ch->last_block = filter & 1))
ch->loop = (filter & 2) != 0;
// If enabled, results in 'tick' sound on some samples that repeat by
// re-using part of the original sample but generate a slightly different
// waveform.
if (!Settings.DisableSampleCaching &&
memcmp ((uint8 *) compressed, &IAPU.ShadowRAM [ch->block_pointer], 9) == 0)
{
ch->block = (signed short *) (IAPU.CachedSamples + (ch->block_pointer << 2));
ch->previous [0] = ch->block [15];
ch->previous [1] = ch->block [14];
}
else
{
if (!Settings.DisableSampleCaching)
memcpy (&IAPU.ShadowRAM [ch->block_pointer], (uint8 *) compressed, 9);
compressed++;
signed short *raw = ch->block = ch->decoded;
// Seperate out the header parts used for decoding
shift = filter >> 4;
filter = filter&0x0c;
// Header validity check: if range(shift) is over 12, ignore
// all bits of the data for that block except for the sign bit of each one
if ((filter&0xF0) < 0xD0)
{
invalid_header = false;
}
else
{
// fprintf(stderr,"invalid header! header: %02x\n", filter);
invalid_header = true;
}
int32 prev0 = ch->previous [0];
int32 prev1 = ch->previous [1];
for (i = 8; i != 0; i--)
{
sample1 = *compressed++;
sample2 = sample1 << 4;
//Sample 2 = Bottom Nibble, Sign Extended.
sample2 >>= 4;
//Sample 1 = Top Nibble, shifted down and Sign Extended.
sample1 >>= 4;
if (invalid_header) { sample1>>=3; sample2>>=3; }
for (int nybblesmp = 0; nybblesmp<2; nybblesmp++){
out=(((nybblesmp) ? sample2 : sample1) << shift);
out >>= 1;
switch(filter)
{
case 0x00:
// Method0 - [Smp]
break;
case 0x04:
// Method1 - [Delta]+[Smp-1](15/16)
out+=(prev0>>1)+((-prev0)>>5);
break;
case 0x08:
// Method2 - [Delta]+[Smp-1](61/32)-[Smp-2](15/16)
out+=(prev0)+((-(prev0 +(prev0>>1)))>>5)-(prev1>>1)+(prev1>>5);
break;
default:
// Method3 - [Delta]+[Smp-1](115/64)-[Smp-2](13/16)
out+=(prev0)+((-(prev0 + (prev0<<2) + (prev0<<3)))>>7)-(prev1>>1)+((prev1+(prev1>>1))>>4);
break;
}
if (out > 32767) out = 32767;
else if (out < -32768) out = -32768;
*raw++ = (signed short)(out<<1);
prev1=(signed short)prev0;
prev0=(signed short)(out<<1);
}
}
ch->previous [0] = prev0;
ch->previous [1] = prev1;
if (!Settings.DisableSampleCaching)
{
memcpy (IAPU.CachedSamples + (ch->block_pointer << 2),
(uint8 *) ch->decoded, 32);
}
}
ch->block_pointer += 9;
}
void MixStereo (int sample_count)
{
#if defined(TARGET_OS_MAC) && TARGET_OS_MAC
static int wave[SOUND_BUFFER_SIZE];
#else
int wave[SOUND_BUFFER_SIZE];
#endif
int pitch_mod = SoundData.pitch_mod & ~APU.DSP[APU_NON];
for (uint32 J = 0; J < NUM_CHANNELS; J++)
{
int32 VL, VR;
Channel *ch = &SoundData.channels[J];
unsigned long freq0 = ch->frequency;
if (ch->state == SOUND_SILENT || !(so.sound_switch & (1 << J)))
continue;
// freq0 = (unsigned long) ((double) freq0 * 0.985);//uncommented by jonathan gevaryahu, as it is necessary for most cards in linux
freq0 = freq0 * 985 / 1000;
bool8_32 mod = pitch_mod & (1 << J);
if (ch->needs_decode)
{
DecodeBlock(ch);
ch->needs_decode = FALSE;
ch->sample = ch->block[0];
ch->sample_pointer = freq0 >> FIXED_POINT_SHIFT;
if (ch->sample_pointer == 0)
ch->sample_pointer = 1;
if (ch->sample_pointer > SOUND_DECODE_LENGTH)
ch->sample_pointer = SOUND_DECODE_LENGTH - 1;
ch->next_sample=ch->block[ch->sample_pointer];
ch->interpolate = 0;
if (Settings.InterpolatedSound && freq0 < FIXED_POINT && !mod)
ch->interpolate = ((ch->next_sample - ch->sample) *
(long) freq0) / (long) FIXED_POINT;
}
VL = (ch->sample * ch-> left_vol_level) / 128;
VR = (ch->sample * ch->right_vol_level) / 128;
for (uint32 I = 0; I < (uint32) sample_count; I += 2)
{
unsigned long freq = freq0;
if (mod)
freq = PITCH_MOD(freq, wave [I / 2]);
ch->env_error += ch->erate;
if (ch->env_error >= FIXED_POINT)
{
uint32 step = ch->env_error >> FIXED_POINT_SHIFT;
switch (ch->state)
{
case SOUND_ATTACK:
ch->env_error &= FIXED_POINT_REMAINDER;
ch->envx += step << 1;
ch->envxx = ch->envx << ENVX_SHIFT;
if (ch->envx >= 126)
{
ch->envx = 127;
ch->envxx = 127 << ENVX_SHIFT;
ch->state = SOUND_DECAY;
if (ch->sustain_level != 8)
{
S9xSetEnvRate (ch, ch->decay_rate, -1,
(MAX_ENVELOPE_HEIGHT * ch->sustain_level)
>> 3);
break;
}
ch->state = SOUND_SUSTAIN;
S9xSetEnvRate (ch, ch->sustain_rate, -1, 0);
}
break;
case SOUND_DECAY:
while (ch->env_error >= FIXED_POINT)
{
ch->envxx = (ch->envxx >> 8) * 255;
ch->env_error -= FIXED_POINT;
}
ch->envx = ch->envxx >> ENVX_SHIFT;
if (ch->envx <= ch->envx_target)
{
if (ch->envx <= 0)
{
S9xAPUSetEndOfSample (J, ch);
goto stereo_exit;
}
ch->state = SOUND_SUSTAIN;
S9xSetEnvRate (ch, ch->sustain_rate, -1, 0);
}
break;
case SOUND_SUSTAIN:
while (ch->env_error >= FIXED_POINT)
{
ch->envxx = (ch->envxx >> 8) * 255;
ch->env_error -= FIXED_POINT;
}
ch->envx = ch->envxx >> ENVX_SHIFT;
if (ch->envx <= 0)
{
S9xAPUSetEndOfSample (J, ch);
goto stereo_exit;
}
break;
case SOUND_RELEASE:
while (ch->env_error >= FIXED_POINT)
{
ch->envxx -= (MAX_ENVELOPE_HEIGHT << ENVX_SHIFT) / 256;
ch->env_error -= FIXED_POINT;
}
ch->envx = ch->envxx >> ENVX_SHIFT;