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sndmix.cpp
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sndmix.cpp
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/*
* This source code is public domain.
*
* Authors: Olivier Lapicque <[email protected]>
*/
#include "stdafx.h"
#include "sndfile.h"
#ifdef MODPLUG_TRACKER
#define ENABLE_STEREOVU
#endif
// Volume ramp length, in 1/10 ms
#define VOLUMERAMPLEN 146 // 1.46ms = 64 samples at 44.1kHz
// VU-Meter
#define VUMETER_DECAY 4
// SNDMIX: These are global flags for playback control
UINT CSoundFile::m_nStereoSeparation = 128;
LONG CSoundFile::m_nStreamVolume = 0x8000;
UINT CSoundFile::m_nMaxMixChannels = 32;
// Mixing Configuration (SetWaveConfig)
DWORD CSoundFile::gdwSysInfo = 0;
DWORD CSoundFile::gnChannels = 1;
DWORD CSoundFile::gdwSoundSetup = 0;
DWORD CSoundFile::gdwMixingFreq = 44100;
DWORD CSoundFile::gnBitsPerSample = 16;
// Mixing data initialized in
UINT CSoundFile::gnAGC = AGC_UNITY;
UINT CSoundFile::gnVolumeRampSamples = 64;
UINT CSoundFile::gnVUMeter = 0;
UINT CSoundFile::gnCPUUsage = 0;
LPSNDMIXHOOKPROC CSoundFile::gpSndMixHook = NULL;
PMIXPLUGINCREATEPROC CSoundFile::gpMixPluginCreateProc = NULL;
LONG gnDryROfsVol = 0;
LONG gnDryLOfsVol = 0;
LONG gnRvbROfsVol = 0;
LONG gnRvbLOfsVol = 0;
int gbInitPlugins = 0;
typedef DWORD (MPPASMCALL * LPCONVERTPROC)(LPVOID, int *, DWORD, LPLONG, LPLONG);
extern DWORD MPPASMCALL X86_Convert32To8(LPVOID lpBuffer, int *, DWORD nSamples, LPLONG, LPLONG);
extern DWORD MPPASMCALL X86_Convert32To16(LPVOID lpBuffer, int *, DWORD nSamples, LPLONG, LPLONG);
extern DWORD MPPASMCALL X86_Convert32To24(LPVOID lpBuffer, int *, DWORD nSamples, LPLONG, LPLONG);
extern DWORD MPPASMCALL X86_Convert32To32(LPVOID lpBuffer, int *, DWORD nSamples, LPLONG, LPLONG);
extern UINT MPPASMCALL X86_AGC(int *pBuffer, UINT nSamples, UINT nAGC);
extern VOID MPPASMCALL X86_Dither(int *pBuffer, UINT nSamples, UINT nBits);
extern VOID MPPASMCALL X86_InterleaveFrontRear(int *pFrontBuf, int *pRearBuf, DWORD nSamples);
extern VOID MPPASMCALL X86_StereoFill(int *pBuffer, UINT nSamples, LPLONG lpROfs, LPLONG lpLOfs);
extern VOID MPPASMCALL X86_MonoFromStereo(int *pMixBuf, UINT nSamples);
extern short int ModSinusTable[64];
extern short int ModRampDownTable[64];
extern short int ModSquareTable[64];
extern short int ModRandomTable[64];
extern DWORD LinearSlideUpTable[256];
extern DWORD LinearSlideDownTable[256];
extern DWORD FineLinearSlideUpTable[16];
extern DWORD FineLinearSlideDownTable[16];
extern signed char ft2VibratoTable[256]; // -64 .. +64
extern int MixSoundBuffer[MIXBUFFERSIZE*4];
extern int MixRearBuffer[MIXBUFFERSIZE*2];
UINT gnReverbSend;
// Log tables for pre-amp
// We don't want the tracker to get too loud
const UINT PreAmpTable[16] =
{
0x60, 0x60, 0x60, 0x70, // 0-7
0x80, 0x88, 0x90, 0x98, // 8-15
0xA0, 0xA4, 0xA8, 0xB0, // 16-23
0xB4, 0xB8, 0xBC, 0xC0, // 24-31
};
const UINT PreAmpAGCTable[16] =
{
0x60, 0x60, 0x60, 0x60,
0x68, 0x70, 0x78, 0x80,
0x84, 0x88, 0x8C, 0x90,
0x94, 0x98, 0x9C, 0xA0,
};
// Return (a*b)/c - no divide error
int _muldiv(long a, long b, long c)
{
#ifdef MSC_VER
int sign, result;
_asm {
mov eax, a
mov ebx, b
or eax, eax
mov edx, eax
jge aneg
neg eax
aneg:
xor edx, ebx
or ebx, ebx
mov ecx, c
jge bneg
neg ebx
bneg:
xor edx, ecx
or ecx, ecx
mov sign, edx
jge cneg
neg ecx
cneg:
mul ebx
cmp edx, ecx
jae diverr
div ecx
jmp ok
diverr:
mov eax, 0x7fffffff
ok:
mov edx, sign
or edx, edx
jge rneg
neg eax
rneg:
mov result, eax
}
return result;
#else
return ((unsigned long long) a * (unsigned long long) b ) / c;
#endif
}
// Return (a*b+c/2)/c - no divide error
int _muldivr(long a, long b, long c)
{
#ifdef MSC_VER
int sign, result;
_asm {
mov eax, a
mov ebx, b
or eax, eax
mov edx, eax
jge aneg
neg eax
aneg:
xor edx, ebx
or ebx, ebx
mov ecx, c
jge bneg
neg ebx
bneg:
xor edx, ecx
or ecx, ecx
mov sign, edx
jge cneg
neg ecx
cneg:
mul ebx
mov ebx, ecx
shr ebx, 1
add eax, ebx
adc edx, 0
cmp edx, ecx
jae diverr
div ecx
jmp ok
diverr:
mov eax, 0x7fffffff
ok:
mov edx, sign
or edx, edx
jge rneg
neg eax
rneg:
mov result, eax
}
return result;
#else
return ((unsigned long long) a * (unsigned long long) b + (c >> 1)) / c;
#endif
}
BOOL CSoundFile::InitPlayer(BOOL bReset)
//--------------------------------------
{
if (m_nMaxMixChannels > MAX_CHANNELS) m_nMaxMixChannels = MAX_CHANNELS;
if (gdwMixingFreq < 4000) gdwMixingFreq = 4000;
if (gdwMixingFreq > MAX_SAMPLE_RATE) gdwMixingFreq = MAX_SAMPLE_RATE;
gnVolumeRampSamples = (gdwMixingFreq * VOLUMERAMPLEN) / 100000;
if (gnVolumeRampSamples < 8) gnVolumeRampSamples = 8;
gnDryROfsVol = gnDryLOfsVol = 0;
gnRvbROfsVol = gnRvbLOfsVol = 0;
if (bReset)
{
gnVUMeter = 0;
gnCPUUsage = 0;
}
gbInitPlugins = (bReset) ? 3 : 1;
InitializeDSP(bReset);
return TRUE;
}
BOOL CSoundFile::FadeSong(UINT msec)
//----------------------------------
{
LONG nsamples = _muldiv(msec, gdwMixingFreq, 1000);
if (nsamples <= 0) return FALSE;
if (nsamples > 0x100000) nsamples = 0x100000;
m_nBufferCount = nsamples;
LONG nRampLength = m_nBufferCount;
// Ramp everything down
for (UINT noff=0; noff < m_nMixChannels; noff++)
{
MODCHANNEL *pramp = &Chn[ChnMix[noff]];
if (!pramp) continue;
pramp->nNewLeftVol = pramp->nNewRightVol = 0;
pramp->nRightRamp = (-pramp->nRightVol << VOLUMERAMPPRECISION) / nRampLength;
pramp->nLeftRamp = (-pramp->nLeftVol << VOLUMERAMPPRECISION) / nRampLength;
pramp->nRampRightVol = pramp->nRightVol << VOLUMERAMPPRECISION;
pramp->nRampLeftVol = pramp->nLeftVol << VOLUMERAMPPRECISION;
pramp->nRampLength = nRampLength;
pramp->dwFlags |= CHN_VOLUMERAMP;
}
m_dwSongFlags |= SONG_FADINGSONG;
return TRUE;
}
BOOL CSoundFile::GlobalFadeSong(UINT msec)
//----------------------------------------
{
if (m_dwSongFlags & SONG_GLOBALFADE) return FALSE;
m_nGlobalFadeMaxSamples = _muldiv(msec, gdwMixingFreq, 1000);
m_nGlobalFadeSamples = m_nGlobalFadeMaxSamples;
m_dwSongFlags |= SONG_GLOBALFADE;
return TRUE;
}
UINT CSoundFile::Read(LPVOID lpDestBuffer, UINT cbBuffer)
//-------------------------------------------------------
{
LPBYTE lpBuffer = (LPBYTE)lpDestBuffer;
LPCONVERTPROC pCvt = X86_Convert32To8;
UINT lRead, lMax, lSampleSize, lCount, lSampleCount, nStat=0;
LONG nVUMeterMin = 0x7FFFFFFF, nVUMeterMax = -0x7FFFFFFF;
UINT nMaxPlugins;
{
nMaxPlugins = MAX_MIXPLUGINS;
while ((nMaxPlugins > 0) && (!m_MixPlugins[nMaxPlugins-1].pMixPlugin)) nMaxPlugins--;
}
m_nMixStat = 0;
lSampleSize = gnChannels;
if (gnBitsPerSample == 16) { lSampleSize *= 2; pCvt = X86_Convert32To16; }
#ifndef FASTSOUNDLIB
else if (gnBitsPerSample == 24) { lSampleSize *= 3; pCvt = X86_Convert32To24; }
else if (gnBitsPerSample == 32) { lSampleSize *= 4; pCvt = X86_Convert32To32; }
#endif
lMax = cbBuffer / lSampleSize;
if ((!lMax) || (!lpBuffer) || (!m_nChannels)) return 0;
lRead = lMax;
if (m_dwSongFlags & SONG_ENDREACHED) goto MixDone;
while (lRead > 0)
{
// Update Channel Data
if (!m_nBufferCount)
{
#ifndef FASTSOUNDLIB
if (m_dwSongFlags & SONG_FADINGSONG)
{
m_dwSongFlags |= SONG_ENDREACHED;
m_nBufferCount = lRead;
} else
#endif
if (!ReadNote())
{
#ifndef FASTSOUNDLIB
if (!FadeSong(FADESONGDELAY))
#endif
{
m_dwSongFlags |= SONG_ENDREACHED;
if (lRead == lMax) goto MixDone;
m_nBufferCount = lRead;
}
}
}
lCount = m_nBufferCount;
if (lCount > MIXBUFFERSIZE) lCount = MIXBUFFERSIZE;
if (lCount > lRead) lCount = lRead;
if (!lCount) break;
lSampleCount = lCount;
#ifndef NO_REVERB
gnReverbSend = 0;
#endif
// Resetting sound buffer
X86_StereoFill(MixSoundBuffer, lSampleCount, &gnDryROfsVol, &gnDryLOfsVol);
if (gnChannels >= 2)
{
lSampleCount *= 2;
m_nMixStat += CreateStereoMix(lCount);
ProcessStereoDSP(lCount);
} else
{
m_nMixStat += CreateStereoMix(lCount);
if (nMaxPlugins) ProcessPlugins(lCount);
ProcessStereoDSP(lCount);
X86_MonoFromStereo(MixSoundBuffer, lCount);
}
nStat++;
#ifndef NO_AGC
// Automatic Gain Control
if (gdwSoundSetup & SNDMIX_AGC) ProcessAGC(lSampleCount);
#endif
UINT lTotalSampleCount = lSampleCount;
#ifndef FASTSOUNDLIB
// Multichannel
if (gnChannels > 2)
{
X86_InterleaveFrontRear(MixSoundBuffer, MixRearBuffer, lSampleCount);
lTotalSampleCount *= 2;
}
// Hook Function
if (gpSndMixHook)
{
gpSndMixHook(MixSoundBuffer, lTotalSampleCount, gnChannels);
}
#endif
// Perform clipping + VU-Meter
lpBuffer += pCvt(lpBuffer, MixSoundBuffer, lTotalSampleCount, &nVUMeterMin, &nVUMeterMax);
// Buffer ready
lRead -= lCount;
m_nBufferCount -= lCount;
}
MixDone:
if (lRead) memset(lpBuffer, (gnBitsPerSample == 8) ? 0x80 : 0, lRead * lSampleSize);
// VU-Meter
nVUMeterMin >>= (24-MIXING_ATTENUATION);
nVUMeterMax >>= (24-MIXING_ATTENUATION);
if (nVUMeterMax < nVUMeterMin) nVUMeterMax = nVUMeterMin;
if ((gnVUMeter = (UINT)(nVUMeterMax - nVUMeterMin)) > 0xFF) gnVUMeter = 0xFF;
if (nStat) { m_nMixStat += nStat-1; m_nMixStat /= nStat; }
return lMax - lRead;
}
/////////////////////////////////////////////////////////////////////////////
// Handles navigation/effects
BOOL CSoundFile::ProcessRow()
//---------------------------
{
if (++m_nTickCount >= m_nMusicSpeed * (m_nPatternDelay+1) + m_nFrameDelay)
{
m_nPatternDelay = 0;
m_nFrameDelay = 0;
m_nTickCount = 0;
m_nRow = m_nNextRow;
// Reset Pattern Loop Effect
if (m_nCurrentPattern != m_nNextPattern) m_nCurrentPattern = m_nNextPattern;
// Check if pattern is valid
if (!(m_dwSongFlags & SONG_PATTERNLOOP))
{
m_nPattern = (m_nCurrentPattern < MAX_ORDERS) ? Order[m_nCurrentPattern] : 0xFF;
if ((m_nPattern < MAX_PATTERNS) && (!Patterns[m_nPattern])) m_nPattern = 0xFE;
while (m_nPattern >= MAX_PATTERNS)
{
// End of song ?
if ((m_nPattern == 0xFF) || (m_nCurrentPattern >= MAX_ORDERS))
{
//if (!m_nRepeatCount)
return FALSE; //never repeat entire song
if (!m_nRestartPos)
{
m_nMusicSpeed = m_nDefaultSpeed;
m_nMusicTempo = m_nDefaultTempo;
m_nGlobalVolume = m_nDefaultGlobalVolume;
for (UINT i=0; i<MAX_CHANNELS; i++)
{
Chn[i].dwFlags |= CHN_NOTEFADE | CHN_KEYOFF;
Chn[i].nFadeOutVol = 0;
if (i < m_nChannels)
{
Chn[i].nGlobalVol = ChnSettings[i].nVolume;
Chn[i].nVolume = ChnSettings[i].nVolume;
Chn[i].nPan = ChnSettings[i].nPan;
Chn[i].nPanSwing = Chn[i].nVolSwing = 0;
Chn[i].nOldVolParam = 0;
Chn[i].nOldOffset = 0;
Chn[i].nOldHiOffset = 0;
Chn[i].nPortamentoDest = 0;
if (!Chn[i].nLength)
{
Chn[i].dwFlags = ChnSettings[i].dwFlags;
Chn[i].nLoopStart = 0;
Chn[i].nLoopEnd = 0;
Chn[i].pHeader = NULL;
Chn[i].pSample = NULL;
Chn[i].pInstrument = NULL;
}
}
}
}
// if (m_nRepeatCount > 0) m_nRepeatCount--;
m_nCurrentPattern = m_nRestartPos;
m_nRow = 0;
if ((Order[m_nCurrentPattern] >= MAX_PATTERNS) || (!Patterns[Order[m_nCurrentPattern]])) return FALSE;
} else
{
m_nCurrentPattern++;
}
m_nPattern = (m_nCurrentPattern < MAX_ORDERS) ? Order[m_nCurrentPattern] : 0xFF;
if ((m_nPattern < MAX_PATTERNS) && (!Patterns[m_nPattern])) m_nPattern = 0xFE;
}
m_nNextPattern = m_nCurrentPattern;
}
// Weird stuff?
if ((m_nPattern >= MAX_PATTERNS) || (!Patterns[m_nPattern])) return FALSE;
// Should never happen
if (m_nRow >= PatternSize[m_nPattern]) m_nRow = 0;
m_nNextRow = m_nRow + 1;
if (m_nNextRow >= PatternSize[m_nPattern])
{
if (!(m_dwSongFlags & SONG_PATTERNLOOP)) m_nNextPattern = m_nCurrentPattern + 1;
m_nNextRow = 0;
}
// Reset channel values
MODCHANNEL *pChn = Chn;
MODCOMMAND *m = Patterns[m_nPattern] + m_nRow * m_nChannels;
for (UINT nChn=0; nChn<m_nChannels; pChn++, nChn++, m++)
{
pChn->nRowNote = m->note;
pChn->nRowInstr = m->instr;
pChn->nRowVolCmd = m->volcmd;
pChn->nRowVolume = m->vol;
pChn->nRowCommand = m->command;
pChn->nRowParam = m->param;
pChn->nLeftVol = pChn->nNewLeftVol;
pChn->nRightVol = pChn->nNewRightVol;
pChn->dwFlags &= ~(CHN_PORTAMENTO | CHN_VIBRATO | CHN_TREMOLO | CHN_PANBRELLO);
pChn->nCommand = 0;
}
}
// Should we process tick0 effects?
if (!m_nMusicSpeed) m_nMusicSpeed = 1;
m_dwSongFlags |= SONG_FIRSTTICK;
if (m_nTickCount)
{
m_dwSongFlags &= ~SONG_FIRSTTICK;
if ((!(m_nType & MOD_TYPE_XM)) && (m_nTickCount < m_nMusicSpeed * (1 + m_nPatternDelay)))
{
if (!(m_nTickCount % m_nMusicSpeed)) m_dwSongFlags |= SONG_FIRSTTICK;
}
}
// Update Effects
return ProcessEffects();
}
////////////////////////////////////////////////////////////////////////////////////////////
// Handles envelopes & mixer setup
BOOL CSoundFile::ReadNote()
//-------------------------
{
if (!ProcessRow()) return FALSE;
////////////////////////////////////////////////////////////////////////////////////
m_nTotalCount++;
if (!m_nMusicTempo) return FALSE;
m_nBufferCount = (gdwMixingFreq * 5 * m_nTempoFactor) / (m_nMusicTempo << 8);
// Master Volume + Pre-Amplification / Attenuation setup
DWORD nMasterVol;
{
int nchn32 = (m_nChannels < 32) ? m_nChannels : 31;
if ((m_nType & MOD_TYPE_IT) && (m_nInstruments) && (nchn32 < 6)) nchn32 = 6;
int realmastervol = m_nMasterVolume;
if (realmastervol > 0x80)
{
realmastervol = 0x80 + ((realmastervol - 0x80) * (nchn32+4)) / 16;
}
UINT attenuation = (gdwSoundSetup & SNDMIX_AGC) ? PreAmpAGCTable[nchn32>>1] : PreAmpTable[nchn32>>1];
DWORD mastervol = (realmastervol * (m_nSongPreAmp + 0x10)) >> 6;
if (mastervol > 0x200) mastervol = 0x200;
if ((m_dwSongFlags & SONG_GLOBALFADE) && (m_nGlobalFadeMaxSamples))
{
mastervol = _muldiv(mastervol, m_nGlobalFadeSamples, m_nGlobalFadeMaxSamples);
}
nMasterVol = (mastervol << 7) / attenuation;
if (nMasterVol > 0x180) nMasterVol = 0x180;
}
////////////////////////////////////////////////////////////////////////////////////
// Update channels data
m_nMixChannels = 0;
MODCHANNEL *pChn = Chn;
for (UINT nChn=0; nChn<MAX_CHANNELS; nChn++,pChn++)
{
if ((pChn->dwFlags & CHN_NOTEFADE) && (!(pChn->nFadeOutVol|pChn->nRightVol|pChn->nLeftVol)))
{
pChn->nLength = 0;
pChn->nROfs = pChn->nLOfs = 0;
}
// Check for unused channel
if ((pChn->dwFlags & CHN_MUTE) || ((nChn >= m_nChannels) && (!pChn->nLength)))
{
pChn->nVUMeter = 0;
#ifdef ENABLE_STEREOVU
pChn->nLeftVU = pChn->nRightVU = 0;
#endif
continue;
}
// Reset channel data
pChn->nInc = 0;
pChn->nRealVolume = 0;
pChn->nRealPan = pChn->nPan + pChn->nPanSwing;
if (pChn->nRealPan < 0) pChn->nRealPan = 0;
if (pChn->nRealPan > 256) pChn->nRealPan = 256;
pChn->nRampLength = 0;
// Calc Frequency
if ((pChn->nPeriod) && (pChn->nLength))
{
int vol = pChn->nVolume + pChn->nVolSwing;
if (vol < 0) vol = 0;
if (vol > 256) vol = 256;
// Tremolo
if (pChn->dwFlags & CHN_TREMOLO)
{
UINT trempos = pChn->nTremoloPos & 0x3F;
if (vol > 0)
{
int tremattn = (m_nType & MOD_TYPE_XM) ? 5 : 6;
switch (pChn->nTremoloType & 0x03)
{
case 1:
vol += (ModRampDownTable[trempos] * (int)pChn->nTremoloDepth) >> tremattn;
break;
case 2:
vol += (ModSquareTable[trempos] * (int)pChn->nTremoloDepth) >> tremattn;
break;
case 3:
vol += (ModRandomTable[trempos] * (int)pChn->nTremoloDepth) >> tremattn;
break;
default:
vol += (ModSinusTable[trempos] * (int)pChn->nTremoloDepth) >> tremattn;
}
}
if ((m_nTickCount) || ((m_nType & (MOD_TYPE_STM|MOD_TYPE_S3M|MOD_TYPE_IT)) && (!(m_dwSongFlags & SONG_ITOLDEFFECTS))))
{
pChn->nTremoloPos = (trempos + pChn->nTremoloSpeed) & 0x3F;
}
}
// Tremor
if (pChn->nCommand == CMD_TREMOR)
{
UINT n = (pChn->nTremorParam >> 4) + (pChn->nTremorParam & 0x0F);
UINT ontime = pChn->nTremorParam >> 4;
if ((!(m_nType & MOD_TYPE_IT)) || (m_dwSongFlags & SONG_ITOLDEFFECTS)) { n += 2; ontime++; }
UINT tremcount = (UINT)pChn->nTremorCount;
if (tremcount >= n) tremcount = 0;
if ((m_nTickCount) || (m_nType & (MOD_TYPE_S3M|MOD_TYPE_IT)))
{
if (tremcount >= ontime) vol = 0;
pChn->nTremorCount = (BYTE)(tremcount + 1);
}
pChn->dwFlags |= CHN_FASTVOLRAMP;
}
// Clip volume
if (vol < 0) vol = 0;
if (vol > 0x100) vol = 0x100;
vol <<= 6;
// Process Envelopes
if (pChn->pHeader)
{
INSTRUMENTHEADER *penv = pChn->pHeader;
// Volume Envelope
if ((pChn->dwFlags & CHN_VOLENV) && (penv->nVolEnv))
{
int envpos = pChn->nVolEnvPosition;
UINT pt = penv->nVolEnv - 1;
for (UINT i=0; i<(UINT)(penv->nVolEnv-1); i++)
{
if (envpos <= penv->VolPoints[i])
{
pt = i;
break;
}
}
int x2 = penv->VolPoints[pt];
int x1, envvol;
if (envpos >= x2)
{
envvol = penv->VolEnv[pt] << 2;
x1 = x2;
} else
if (pt)
{
envvol = penv->VolEnv[pt-1] << 2;
x1 = penv->VolPoints[pt-1];
} else
{
envvol = 0;
x1 = 0;
}
if (envpos > x2) envpos = x2;
if ((x2 > x1) && (envpos > x1))
{
envvol += ((envpos - x1) * (((int)penv->VolEnv[pt]<<2) - envvol)) / (x2 - x1);
}
if (envvol < 0) envvol = 0;
if (envvol > 256) envvol = 256;
vol = (vol * envvol) >> 8;
}
// Panning Envelope
if ((pChn->dwFlags & CHN_PANENV) && (penv->nPanEnv))
{
int envpos = pChn->nPanEnvPosition;
UINT pt = penv->nPanEnv - 1;
for (UINT i=0; i<(UINT)(penv->nPanEnv-1); i++)
{
if (envpos <= penv->PanPoints[i])
{
pt = i;
break;
}
}
int x2 = penv->PanPoints[pt], y2 = penv->PanEnv[pt];
int x1, envpan;
if (envpos >= x2)
{
envpan = y2;
x1 = x2;
} else
if (pt)
{
envpan = penv->PanEnv[pt-1];
x1 = penv->PanPoints[pt-1];
} else
{
envpan = 128;
x1 = 0;
}
if ((x2 > x1) && (envpos > x1))
{
envpan += ((envpos - x1) * (y2 - envpan)) / (x2 - x1);
}
if (envpan < 0) envpan = 0;
if (envpan > 64) envpan = 64;
int pan = pChn->nPan;
if (pan >= 128)
{
pan += ((envpan - 32) * (256 - pan)) / 32;
} else
{
pan += ((envpan - 32) * (pan)) / 32;
}
if (pan < 0) pan = 0;
if (pan > 256) pan = 256;
pChn->nRealPan = pan;
}
// FadeOut volume
if (pChn->dwFlags & CHN_NOTEFADE)
{
UINT fadeout = penv->nFadeOut;
if (fadeout)
{
pChn->nFadeOutVol -= fadeout << 1;
if (pChn->nFadeOutVol <= 0) pChn->nFadeOutVol = 0;
vol = (vol * pChn->nFadeOutVol) >> 16;
} else
if (!pChn->nFadeOutVol)
{
vol = 0;
}
}
// Pitch/Pan separation
if ((penv->nPPS) && (pChn->nRealPan) && (pChn->nNote))
{
int pandelta = (int)pChn->nRealPan + (int)((int)(pChn->nNote - penv->nPPC - 1) * (int)penv->nPPS) / (int)8;
if (pandelta < 0) pandelta = 0;
if (pandelta > 256) pandelta = 256;
pChn->nRealPan = pandelta;
}
} else
{
// No Envelope: key off => note cut
if (pChn->dwFlags & CHN_NOTEFADE) // 1.41-: CHN_KEYOFF|CHN_NOTEFADE
{
pChn->nFadeOutVol = 0;
vol = 0;
}
}
// vol is 14-bits
if (vol)
{
// IMPORTANT: pChn->nRealVolume is 14 bits !!!
// -> _muldiv( 14+8, 6+6, 18); => RealVolume: 14-bit result (22+12-20)
pChn->nRealVolume = _muldiv(vol * m_nGlobalVolume, pChn->nGlobalVol * pChn->nInsVol, 1 << 20);
}
if (pChn->nPeriod < m_nMinPeriod) pChn->nPeriod = m_nMinPeriod;
int period = pChn->nPeriod;
if ((pChn->dwFlags & (CHN_GLISSANDO|CHN_PORTAMENTO)) == (CHN_GLISSANDO|CHN_PORTAMENTO))
{
period = GetPeriodFromNote(GetNoteFromPeriod(period), pChn->nFineTune, pChn->nC4Speed);
}
// Arpeggio ?
if (pChn->nCommand == CMD_ARPEGGIO)
{
switch(m_nTickCount % 3)
{
case 1: period = GetPeriodFromNote(pChn->nNote + (pChn->nArpeggio >> 4), pChn->nFineTune, pChn->nC4Speed); break;
case 2: period = GetPeriodFromNote(pChn->nNote + (pChn->nArpeggio & 0x0F), pChn->nFineTune, pChn->nC4Speed); break;
}
}
if (m_dwSongFlags & SONG_AMIGALIMITS)
{
if (period < 113*4) period = 113*4;
if (period > 856*4) period = 856*4;
}
// Pitch/Filter Envelope
if ((pChn->pHeader) && (pChn->dwFlags & CHN_PITCHENV) && (pChn->pHeader->nPitchEnv))
{
INSTRUMENTHEADER *penv = pChn->pHeader;
int envpos = pChn->nPitchEnvPosition;
UINT pt = penv->nPitchEnv - 1;
for (UINT i=0; i<(UINT)(penv->nPitchEnv-1); i++)
{
if (envpos <= penv->PitchPoints[i])
{
pt = i;
break;
}
}
int x2 = penv->PitchPoints[pt];
int x1, envpitch;
if (envpos >= x2)
{
envpitch = (((int)penv->PitchEnv[pt]) - 32) * 8;
x1 = x2;
} else
if (pt)
{
envpitch = (((int)penv->PitchEnv[pt-1]) - 32) * 8;
x1 = penv->PitchPoints[pt-1];
} else
{
envpitch = 0;
x1 = 0;
}
if (envpos > x2) envpos = x2;
if ((x2 > x1) && (envpos > x1))
{
int envpitchdest = (((int)penv->PitchEnv[pt]) - 32) * 8;
envpitch += ((envpos - x1) * (envpitchdest - envpitch)) / (x2 - x1);
}
if (envpitch < -256) envpitch = -256;
if (envpitch > 256) envpitch = 256;
// Filter Envelope: controls cutoff frequency
if (penv->dwFlags & ENV_FILTER)
{
#ifndef NO_FILTER
SetupChannelFilter(pChn, (pChn->dwFlags & CHN_FILTER) ? FALSE : TRUE, envpitch);
#endif // NO_FILTER
} else
// Pitch Envelope
{
int l = envpitch;
if (l < 0)
{
l = -l;
if (l > 255) l = 255;
period = _muldiv(period, LinearSlideUpTable[l], 0x10000);
} else
{
if (l > 255) l = 255;
period = _muldiv(period, LinearSlideDownTable[l], 0x10000);
}
}
}
// Vibrato
if (pChn->dwFlags & CHN_VIBRATO)
{
UINT vibpos = pChn->nVibratoPos;
LONG vdelta;
switch (pChn->nVibratoType & 0x03)
{
case 1:
vdelta = ModRampDownTable[vibpos];
break;
case 2:
vdelta = ModSquareTable[vibpos];
break;
case 3:
vdelta = ModRandomTable[vibpos];
break;
default:
vdelta = ModSinusTable[vibpos];
}
UINT vdepth = ((m_nType != MOD_TYPE_IT) || (m_dwSongFlags & SONG_ITOLDEFFECTS)) ? 6 : 7;
vdelta = (vdelta * (int)pChn->nVibratoDepth) >> vdepth;
if ((m_dwSongFlags & SONG_LINEARSLIDES) && (m_nType & MOD_TYPE_IT))
{
LONG l = vdelta;
if (l < 0)
{
l = -l;
vdelta = _muldiv(period, LinearSlideDownTable[l >> 2], 0x10000) - period;
if (l & 0x03) vdelta += _muldiv(period, FineLinearSlideDownTable[l & 0x03], 0x10000) - period;
} else
{
vdelta = _muldiv(period, LinearSlideUpTable[l >> 2], 0x10000) - period;
if (l & 0x03) vdelta += _muldiv(period, FineLinearSlideUpTable[l & 0x03], 0x10000) - period;
}
}
period += vdelta;
if ((m_nTickCount) || ((m_nType & MOD_TYPE_IT) && (!(m_dwSongFlags & SONG_ITOLDEFFECTS))))
{
pChn->nVibratoPos = (vibpos + pChn->nVibratoSpeed) & 0x3F;
}
}
// Panbrello
if (pChn->dwFlags & CHN_PANBRELLO)
{
UINT panpos = ((pChn->nPanbrelloPos+0x10) >> 2) & 0x3F;
LONG pdelta;
switch (pChn->nPanbrelloType & 0x03)
{
case 1:
pdelta = ModRampDownTable[panpos];
break;
case 2:
pdelta = ModSquareTable[panpos];
break;
case 3:
pdelta = ModRandomTable[panpos];
break;
default:
pdelta = ModSinusTable[panpos];
}
pChn->nPanbrelloPos += pChn->nPanbrelloSpeed;
pdelta = ((pdelta * (int)pChn->nPanbrelloDepth) + 2) >> 3;
pdelta += pChn->nRealPan;
if (pdelta < 0) pdelta = 0;
if (pdelta > 256) pdelta = 256;
pChn->nRealPan = pdelta;
}
int nPeriodFrac = 0;
// Instrument Auto-Vibrato
if ((pChn->pInstrument) && (pChn->pInstrument->nVibDepth))
{
MODINSTRUMENT *pins = pChn->pInstrument;
if (pins->nVibSweep == 0)
{
pChn->nAutoVibDepth = pins->nVibDepth << 8;
} else
{
if (m_nType & MOD_TYPE_IT)
{
pChn->nAutoVibDepth += pins->nVibSweep << 3;
} else
if (!(pChn->dwFlags & CHN_KEYOFF))
{
pChn->nAutoVibDepth += (pins->nVibDepth << 8) / pins->nVibSweep;
}
if ((pChn->nAutoVibDepth >> 8) > pins->nVibDepth)
pChn->nAutoVibDepth = pins->nVibDepth << 8;
}
pChn->nAutoVibPos += pins->nVibRate;
int val;
switch(pins->nVibType)
{
case 4: // Random
val = ModRandomTable[pChn->nAutoVibPos & 0x3F];
pChn->nAutoVibPos++;
break;
case 3: // Ramp Down
val = ((0x40 - (pChn->nAutoVibPos >> 1)) & 0x7F) - 0x40;
break;
case 2: // Ramp Up
val = ((0x40 + (pChn->nAutoVibPos >> 1)) & 0x7f) - 0x40;
break;
case 1: // Square
val = (pChn->nAutoVibPos & 128) ? +64 : -64;
break;
default: // Sine
val = ft2VibratoTable[pChn->nAutoVibPos & 255];
}
int n = ((val * pChn->nAutoVibDepth) >> 8);
if (m_nType & MOD_TYPE_IT)
{
int df1, df2;
if (n < 0)
{
n = -n;
UINT n1 = n >> 8;
df1 = LinearSlideUpTable[n1];
df2 = LinearSlideUpTable[n1+1];
} else
{
UINT n1 = n >> 8;
df1 = LinearSlideDownTable[n1];
df2 = LinearSlideDownTable[n1+1];
}
n >>= 2;
period = _muldiv(period, df1 + ((df2-df1)*(n&0x3F)>>6), 256);
nPeriodFrac = period & 0xFF;
period >>= 8;
} else
{
period += (n >> 6);
}
}
// Final Period
if (period <= m_nMinPeriod)
{
if (m_nType & MOD_TYPE_S3M) pChn->nLength = 0;
period = m_nMinPeriod;
}
if (period > m_nMaxPeriod)
{
if ((m_nType & MOD_TYPE_IT) || (period >= 0x100000))
{
pChn->nFadeOutVol = 0;
pChn->dwFlags |= CHN_NOTEFADE;
pChn->nRealVolume = 0;
}
period = m_nMaxPeriod;
nPeriodFrac = 0;
}
UINT freq = GetFreqFromPeriod(period, pChn->nC4Speed, nPeriodFrac);
if ((m_nType & MOD_TYPE_IT) && (freq < 256))
{
pChn->nFadeOutVol = 0;
pChn->dwFlags |= CHN_NOTEFADE;
pChn->nRealVolume = 0;
}
UINT ninc = _muldiv(freq, 0x10000, gdwMixingFreq);
if ((ninc >= 0xFFB0) && (ninc <= 0x10090)) ninc = 0x10000;
if (m_nFreqFactor != 128) ninc = (ninc * m_nFreqFactor) >> 7;
if (ninc > 0xFF0000) ninc = 0xFF0000;
pChn->nInc = (ninc+1) & ~3;
}
// Increment envelope position
if (pChn->pHeader)
{
INSTRUMENTHEADER *penv = pChn->pHeader;
// Volume Envelope
if (pChn->dwFlags & CHN_VOLENV)
{
// Increase position
pChn->nVolEnvPosition++;
// Volume Loop ?
if (penv->dwFlags & ENV_VOLLOOP)
{
UINT volloopend = penv->VolPoints[penv->nVolLoopEnd];
if (m_nType != MOD_TYPE_XM) volloopend++;
if (pChn->nVolEnvPosition == volloopend)
{
pChn->nVolEnvPosition = penv->VolPoints[penv->nVolLoopStart];
if ((penv->nVolLoopEnd == penv->nVolLoopStart) && (!penv->VolEnv[penv->nVolLoopStart])
&& ((!(m_nType & MOD_TYPE_XM)) || (penv->nVolLoopEnd+1 == penv->nVolEnv)))
{
pChn->dwFlags |= CHN_NOTEFADE;
pChn->nFadeOutVol = 0;
}
}
}
// Volume Sustain ?
if ((penv->dwFlags & ENV_VOLSUSTAIN) && (!(pChn->dwFlags & CHN_KEYOFF)))
{
if (pChn->nVolEnvPosition == (UINT)penv->VolPoints[penv->nVolSustainEnd]+1)
pChn->nVolEnvPosition = penv->VolPoints[penv->nVolSustainBegin];
} else
// End of Envelope ?
if (pChn->nVolEnvPosition > penv->VolPoints[penv->nVolEnv - 1])
{
if ((m_nType & MOD_TYPE_IT) || (pChn->dwFlags & CHN_KEYOFF)) pChn->dwFlags |= CHN_NOTEFADE;
pChn->nVolEnvPosition = penv->VolPoints[penv->nVolEnv - 1];
if ((!penv->VolEnv[penv->nVolEnv-1]) && ((nChn >= m_nChannels) || (m_nType & MOD_TYPE_IT)))
{
pChn->dwFlags |= CHN_NOTEFADE;
pChn->nFadeOutVol = 0;
pChn->nRealVolume = 0;
}
}
}