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DrumSynth.cpp
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DrumSynth.cpp
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/*
* DrumSynth.cpp - DrumSynth DS file renderer
*
* Copyright (c) 1998-2000 Paul Kellett (mda-vst.com)
* Copyright (c) 2007 Paul Giblock <drfaygo/at/gmail.com>
*
* This file is part of LMMS - https://lmms.io
*
* 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 (see COPYING); if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA.
*
*/
#include "DrumSynth.h"
#include <sstream>
#include <cstring>
#include <math.h> //sin(), exp(), etc.
#include <QFile>
#ifdef LMMS_BUILD_WIN32
#define powf pow
#endif
#ifdef _MSC_VER
//not #if LMMS_BUILD_WIN32 because we have strncasecmp in mingw
#define strcasecmp _stricmp
#endif
using namespace std;
#define WORD __u16
#define DWORD __u32
#define WAVE_FORMAT_PCM 0x0001
// const int Fs = 44100;
const float TwoPi = 6.2831853f;
const int MAX = 0;
const int ENV = 1;
const int PNT = 2;
const int dENV = 3;
const int NEXTT = 4;
// Bah, I'll move these into the class once I sepearate DrumsynthFile from DrumSynth
// llama
float envpts[8][3][32]; //envelope/time-level/point
float envData[8][6]; //envelope running status
int chkOn[8], sliLev[8]; //section on/off and level
float timestretch; //overall time scaling
short DD[1200], clippoint;
float DF[1200];
float phi[1200];
long wavewords, wavemode=0;
float mem_t=1.0f, mem_o=1.0f, mem_n=1.0f, mem_b=1.0f, mem_tune=1.0f, mem_time=1.0f;
int DrumSynth::LongestEnv(void)
{
long e, eon, p;
float l=0.f;
for(e=1; e<7; e++) //3
{
eon = e - 1; if(eon>2) eon=eon-1;
p = 0;
while (envpts[e][0][p + 1] >= 0.f) p++;
envData[e][MAX] = envpts[e][0][p] * timestretch;
if(chkOn[eon]==1) if(envData[e][MAX]>l) l=envData[e][MAX];
}
//l *= timestretch;
return 2400 + (1200 * (int)(l / 1200));
}
float DrumSynth::LoudestEnv(void)
{
float loudest=0.f;
int i=0;
while (i<5) //2
{
if(chkOn[i]==1) if(sliLev[i]>loudest) loudest=(float)sliLev[i];
i++;
}
return (loudest * loudest);
}
void DrumSynth::UpdateEnv(int e, long t)
{
float endEnv, dT;
//0.2's added
envData[e][NEXTT] = envpts[e][0][(long)(envData[e][PNT] + 1.f)] * timestretch; //get next point
if(envData[e][NEXTT] < 0) envData[e][NEXTT] = 442000 * timestretch; //if end point, hold
envData[e][ENV] = envpts[e][1][(long)(envData[e][PNT] + 0.f)] * 0.01f; //this level
endEnv = envpts[e][1][(long)(envData[e][PNT] + 1.f)] * 0.01f; //next level
dT = envData[e][NEXTT] - (float)t;
if(dT < 1.0) dT = 1.0;
envData[e][dENV] = (endEnv - envData[e][ENV]) / dT;
envData[e][PNT] = envData[e][PNT] + 1.0f;
}
void DrumSynth::GetEnv(int env, const char *sec, const char *key, QString ini)
{
char en[256], s[8];
int i=0, o=0, ep=0;
GetPrivateProfileString(sec, key, "0,0 100,0", en, sizeof(en), ini);
en[255]=0; //be safe!
while(en[i]!=0)
{
if(en[i] == ',')
{
if(sscanf(s, "%f", &envpts[env][0][ep])==0) envpts[env][0][ep] = 0.f;
o=0;
}
else if(en[i] == ' ')
{
if(sscanf(s, "%f", &envpts[env][1][ep])==0) envpts[env][1][ep] = 0.f;
o=0; ep++;
}
else { s[o]=en[i]; o++; s[o]=0; }
i++;
}
if(sscanf(s, "%f", &envpts[env][1][ep])==0) envpts[env][1][ep] = 0.f;
envpts[env][0][ep + 1] = -1;
envData[env][MAX] = envpts[env][0][ep];
}
float DrumSynth::waveform(float ph, int form)
{
float w;
switch (form)
{
case 0: w = (float)sin(fmod(ph,TwoPi)); break; //sine
case 1: w = (float)fabs(2.0f*(float)sin(fmod(0.5f*ph,TwoPi)))-1.f; break; //sine^2
case 2: while(ph<TwoPi) ph+=TwoPi;
w = 0.6366197f * (float)fmod(ph,TwoPi) - 1.f; //tri
if(w>1.f) w=2.f-w;
break;
case 3: w = ph - TwoPi * (float)(int)(ph / TwoPi); //saw
w = (0.3183098f * w) - 1.f; break;
default: w = (sin(fmod(ph,TwoPi))>0.0)? 1.f: -1.f; break; //square
}
return w;
}
int DrumSynth::GetPrivateProfileString(const char *sec, const char *key, const char *def, char *buffer, int size, QString file)
{
stringstream is;
bool inSection = false;
char *line;
char *k, *b;
int len = 0;
line = (char*)malloc(200);
// Use QFile to handle unicode file name on Windows
// Previously we used ifstream directly
QFile f(file);
f.open(QIODevice::ReadOnly);
QByteArray dat = f.readAll().constData();
is.str(string(dat.constData(), dat.size()));
while (is.good()) {
if (!inSection) {
is.ignore( numeric_limits<streamsize>::max(), '[');
if (!is.eof()) {
is.getline(line, 200, ']');
if (strcasecmp(line, sec)==0) {
inSection = true;
}
}
}
else if (!is.eof()) {
is.getline(line, 200);
if (line[0] == '[')
break;
k = strtok(line, " \t=");
b = strtok(NULL, "\n\r\0");
if (k != 0 && strcasecmp(k, key)==0) {
if (b==0) {
len = 0;
buffer[0] = 0;
}
else {
k = (char *)(b + strlen(b)-1);
while ( (k>=b) && (*k==' ' || *k=='\t') )
--k;
*(k+1) = '\0';
len = strlen(b);
if (len > size-1) len = size-1;
strncpy(buffer, b, len+1);
}
break;
}
}
}
if (len == 0) {
len = strlen(def);
strncpy(buffer, def, size);
}
free(line);
return len;
}
int DrumSynth::GetPrivateProfileInt(const char *sec, const char *key, int def, QString file)
{
char tmp[16];
int i=0;
GetPrivateProfileString(sec, key, "", tmp, sizeof(tmp), file);
sscanf(tmp, "%d", &i); if(tmp[0]==0) i=def;
return i;
}
float DrumSynth::GetPrivateProfileFloat(const char *sec, const char *key, float def, QString file)
{
char tmp[16];
float f=0.f;
GetPrivateProfileString(sec, key, "", tmp, sizeof(tmp), file);
sscanf(tmp, "%f", &f); if(tmp[0]==0) f=def;
return f;
}
// Constantly opening and scanning each file for the setting really sucks.
// But, the original did this, and we know it works. Will store file into
// an associative array or something once we have a datastructure to load in to.
// llama
int DrumSynth::GetDSFileSamples(QString dsfile, int16_t *&wave, int channels, sample_rate_t Fs)
{
//input file
char sec[32];
char ver[32];
char comment[256];
int commentLen=0;
//generation
long Length, tpos=0, tplus, totmp, t, i, j;
float x[3] = {0.f, 0.f, 0.f};
float MasterTune, randmax, randmax2;
int MainFilter, HighPass;
long NON, NT, TON, DiON, TDroop=0, DStep;
float a, b=0.f, c=0.f, d=0.f, g, TT=0.f, TL, NL, F1, F2;
float TphiStart=0.f, Tphi, TDroopRate, ddF, DAtten, DGain;
long BON, BON2, BFStep, BFStep2, botmp;
float BdF=0.f, BdF2=0.f, BPhi, BPhi2, BF, BF2, BQ, BQ2, BL, BL2;
long OON, OF1Sync=0, OF2Sync=0, OMode, OW1, OW2;
float Ophi1, Ophi2, OF1, OF2, OL, Ot=0 /*PG: init */, OBal1, OBal2, ODrive;
float Ocf1, Ocf2, OcF, OcQ, OcA, Oc[6][2]; //overtone cymbal mode
float Oc0=0.0f, Oc1=0.0f, Oc2=0.0f;
float MFfb, MFtmp, MFres, MFin=0.f, MFout=0.f;
float DownAve;
long DownStart, DownEnd, jj;
if(wavemode==0) //semi-real-time adjustments if working in memory!!
{
mem_t = 1.0f;
mem_o = 1.0f;
mem_n = 1.0f;
mem_b = 1.0f;
mem_tune = 0.0f;
mem_time = 1.0f;
}
//try to read version from input file
strcpy(sec, "General");
GetPrivateProfileString(sec,"Version","",ver,sizeof(ver),dsfile);
ver[9]=0;
if(strcasecmp(ver, "DrumSynth") != 0) {return 0;} //input fail
if(ver[11] != '1' && ver[11] != '2') {return 0;} //version fail
//read master parameters
GetPrivateProfileString(sec,"Comment","",comment,sizeof(comment),dsfile);
while((comment[commentLen]!=0) && (commentLen<254)) commentLen++;
if(commentLen==0) { comment[0]=32; comment[1]=0; commentLen=1;}
comment[commentLen+1]=0; commentLen++;
if((commentLen % 2)==1) commentLen++;
timestretch = .01f * mem_time * GetPrivateProfileFloat(sec,"Stretch",100.0,dsfile);
if(timestretch<0.2f) timestretch=0.2f;
if(timestretch>10.f) timestretch=10.f;
DGain = 1.0f; //leave this here!
DGain = (float)powf(10.0, 0.05 * GetPrivateProfileFloat(sec,"Level",0,dsfile));
MasterTune = GetPrivateProfileFloat(sec,"Tuning",0.0,dsfile);
MasterTune = (float)powf(1.0594631f, MasterTune + mem_tune);
MainFilter = 2 * GetPrivateProfileInt(sec,"Filter",0,dsfile);
MFres = 0.0101f * GetPrivateProfileFloat(sec,"Resonance",0.0,dsfile);
MFres = (float)powf(MFres, 0.5f);
HighPass = GetPrivateProfileInt(sec,"HighPass",0,dsfile);
GetEnv(7, sec, "FilterEnv", dsfile);
//read noise parameters
strcpy(sec, "Noise");
chkOn[1] = GetPrivateProfileInt(sec,"On",0,dsfile);
sliLev[1] = GetPrivateProfileInt(sec,"Level",0,dsfile);
NT = GetPrivateProfileInt(sec,"Slope",0,dsfile);
GetEnv(2, sec, "Envelope", dsfile);
NON = chkOn[1];
NL = (float)(sliLev[1] * sliLev[1]) * mem_n;
if(NT<0)
{ a = 1.f + (NT / 105.f); d = -NT / 105.f;
g = (1.f + 0.0005f * NT * NT) * NL; }
else
{ a = 1.f; b = -NT / 50.f; c = (float)fabs((float)NT) / 100.f; g = NL; }
//if(GetPrivateProfileInt(sec,"FixedSeq",0,dsfile)!=0)
//srand(1); //fixed random sequence
//read tone parameters
strcpy(sec, "Tone");
chkOn[0] = GetPrivateProfileInt(sec,"On",0,dsfile); TON = chkOn[0];
sliLev[0] = GetPrivateProfileInt(sec,"Level",128,dsfile);
TL = (float)(sliLev[0] * sliLev[0]) * mem_t;
GetEnv(1, sec, "Envelope", dsfile);
F1 = MasterTune * TwoPi * GetPrivateProfileFloat(sec,"F1",200.0,dsfile) / Fs;
if(fabs(F1)<0.001f) F1=0.001f; //to prevent overtone ratio div0
F2 = MasterTune * TwoPi * GetPrivateProfileFloat(sec,"F2",120.0,dsfile) / Fs;
TDroopRate = GetPrivateProfileFloat(sec,"Droop",0.f,dsfile);
if(TDroopRate>0.f)
{
TDroopRate = (float)powf(10.0f, (TDroopRate - 20.0f) / 30.0f);
TDroopRate = TDroopRate * -4.f / envData[1][MAX];
TDroop = 1;
F2 = F1+((F2-F1)/(1.f-(float)exp(TDroopRate * envData[1][MAX])));
ddF = F1 - F2;
}
else ddF = F2-F1;
Tphi = GetPrivateProfileFloat(sec,"Phase",90.f,dsfile) / 57.29578f; //degrees>radians
//read overtone parameters
strcpy(sec, "Overtones");
chkOn[2] = GetPrivateProfileInt(sec,"On",0,dsfile); OON = chkOn[2];
sliLev[2] = GetPrivateProfileInt(sec,"Level",128,dsfile);
OL = (float)(sliLev[2] * sliLev[2]) * mem_o;
GetEnv(3, sec, "Envelope1", dsfile);
GetEnv(4, sec, "Envelope2", dsfile);
OMode = GetPrivateProfileInt(sec,"Method",2,dsfile);
OF1 = MasterTune * TwoPi * GetPrivateProfileFloat(sec,"F1",200.0,dsfile) / Fs;
OF2 = MasterTune * TwoPi * GetPrivateProfileFloat(sec,"F2",120.0,dsfile) / Fs;
OW1 = GetPrivateProfileInt(sec,"Wave1",0,dsfile);
OW2 = GetPrivateProfileInt(sec,"Wave2",0,dsfile);
OBal2 = (float)GetPrivateProfileInt(sec,"Param",50,dsfile);
ODrive = (float)powf(OBal2, 3.0f) / (float)powf(50.0f, 3.0f);
OBal2 *= 0.01f;
OBal1 = 1.f - OBal2;
Ophi1 = Tphi;
Ophi2 = Tphi;
if(MainFilter==0)
MainFilter = GetPrivateProfileInt(sec,"Filter",0,dsfile);
if((GetPrivateProfileInt(sec,"Track1",0,dsfile)==1) && (TON==1))
{ OF1Sync = 1; OF1 = OF1 / F1; }
if((GetPrivateProfileInt(sec,"Track2",0,dsfile)==1) && (TON==1))
{ OF2Sync = 1; OF2 = OF2 / F1; }
OcA = 0.28f + OBal1 * OBal1; //overtone cymbal mode
OcQ = OcA * OcA;
OcF = (1.8f - 0.7f * OcQ) * 0.92f; //multiply by env 2
OcA *= 1.0f + 4.0f * OBal1; //level is a compromise!
Ocf1 = TwoPi / OF1;
Ocf2 = TwoPi / OF2;
for(i=0; i<6; i++) Oc[i][0] = Oc[i][1] = Ocf1 + (Ocf2 - Ocf1) * 0.2f * (float)i;
//read noise band parameters
strcpy(sec, "NoiseBand");
chkOn[3] = GetPrivateProfileInt(sec,"On",0,dsfile); BON = chkOn[3];
sliLev[3] = GetPrivateProfileInt(sec,"Level",128,dsfile);
BL = (float)(sliLev[3] * sliLev[3]) * mem_b;
BF = MasterTune * TwoPi * GetPrivateProfileFloat(sec,"F",1000.0,dsfile) / Fs;
BPhi = TwoPi / 8.f;
GetEnv(5, sec, "Envelope", dsfile);
BFStep = GetPrivateProfileInt(sec,"dF",50,dsfile);
BQ = (float)BFStep;
BQ = BQ * BQ / (10000.f-6600.f*((float)sqrt(BF)-0.19f));
BFStep = 1 + (int)((40.f - (BFStep / 2.5f)) / (BQ + 1.f + (1.f * BF)));
strcpy(sec, "NoiseBand2");
chkOn[4] = GetPrivateProfileInt(sec,"On",0,dsfile); BON2 = chkOn[4];
sliLev[4] = GetPrivateProfileInt(sec,"Level",128,dsfile);
BL2 = (float)(sliLev[4] * sliLev[4]) * mem_b;
BF2 = MasterTune * TwoPi * GetPrivateProfileFloat(sec,"F",1000.0,dsfile) / Fs;
BPhi2 = TwoPi / 8.f;
GetEnv(6, sec, "Envelope", dsfile);
BFStep2 = GetPrivateProfileInt(sec,"dF",50,dsfile);
BQ2 = (float)BFStep2;
BQ2 = BQ2 * BQ2 / (10000.f-6600.f*((float)sqrt(BF2)-0.19f));
BFStep2 = 1 + (int)((40 - (BFStep2 / 2.5)) / (BQ2 + 1 + (1 * BF2)));
//read distortion parameters
strcpy(sec, "Distortion");
chkOn[5] = GetPrivateProfileInt(sec,"On",0,dsfile); DiON = chkOn[5];
DStep = 1 + GetPrivateProfileInt(sec,"Rate",0,dsfile);
if(DStep==7) DStep=20;
if(DStep==6) DStep=10;
if(DStep==5) DStep=8;
clippoint = 32700;
DAtten = 1.0f;
if(DiON==1)
{
DAtten = DGain * (short)LoudestEnv();
if(DAtten>32700) clippoint=32700; else clippoint=(short)DAtten;
DAtten = (float)powf(2.0, 2.0 * GetPrivateProfileInt(sec,"Bits",0,dsfile));
DGain = DAtten * DGain * (float)powf(10.0, 0.05 * GetPrivateProfileInt(sec,"Clipping",0,dsfile));
}
//prepare envelopes
randmax = 1.f / RAND_MAX; randmax2 = 2.f * randmax;
for (i=1;i<8;i++) { envData[i][NEXTT]=0; envData[i][PNT]=0; }
Length = LongestEnv();
//allocate the buffer
//if(wave!=NULL) free(wave);
//wave = new int16_t[channels * (Length + 1280)]; //wave memory buffer
wave = new int16_t[channels * Length]; //wave memory buffer
if(wave==NULL) {return 0;}
wavewords = 0;
/*
if(wavemode==0)
{
//open output file
fp = fopen(wavfile, "wb");
if(!fp) {return 3;} //output fail
//set up INFO chunk
WI.list = 0x5453494C;
WI.listLength = 36 + commentLen;
WI.info = 0x4F464E49;
WI.isft = 0x54465349;
WI.isftLength = 16;
strcpy(WI.software, "DrumSynth v2.0 "); WI.software[15]=0;
WI.icmt = 0x544D4349;
WI.icmtLength = commentLen;
//write WAV header
WH.riff = 0x46464952;
WH.riffLength = 36 + (2 * Length) + 44 + commentLen;
WH.wave = 0x45564157;
WH.fmt = 0x20746D66;
WH.waveLength = 16;
WH.wFormatTag = WAVE_FORMAT_PCM;
WH.nChannels = 1;
WH.nSamplesPerSec = Fs;
WH.nAvgBytesPerSec = 2 * Fs;
WH.nBlockAlign = 2;
WH.wBitsPerSample = 16;
WH.data = 0x61746164;
WH.dataLength = 2 * Length;
fwrite(&WH, 1, 44, fp);
}
*/
//generate
tpos = 0;
while(tpos<Length)
{
tplus = tpos + 1199;
if(NON==1) //noise
{
for(t=tpos; t<=tplus; t++)
{
if(t < envData[2][NEXTT]) envData[2][ENV] = envData[2][ENV] + envData[2][dENV];
else UpdateEnv(2, t);
x[2] = x[1];
x[1] = x[0];
x[0] = (randmax2 * (float)rand()) - 1.f;
TT = a * x[0] + b * x[1] + c * x[2] + d * TT;
DF[t - tpos] = TT * g * envData[2][ENV];
}
if(t>=envData[2][MAX]) NON=0;
}
else {
for(j=0; j<1200; j++) DF[j]=0.f;
}
if(TON==1) //tone
{
TphiStart = Tphi;
if(TDroop==1)
{
for(t=tpos; t<=tplus; t++)
phi[t - tpos] = F2 + (ddF * (float)exp(t * TDroopRate));
}
else
{
for(t=tpos; t<=tplus; t++)
phi[t - tpos] = F1 + (t / envData[1][MAX]) * ddF;
}
for(t=tpos; t<=tplus; t++)
{
totmp = t - tpos;
if(t < envData[1][NEXTT])
envData[1][ENV] = envData[1][ENV] + envData[1][dENV];
else UpdateEnv(1, t);
Tphi = Tphi + phi[totmp];
DF[totmp] += TL * envData[1][ENV] * (float)sin(fmod(Tphi,TwoPi));//overflow?
}
if(t>=envData[1][MAX]) TON=0;
}
else for(j=0; j<1200; j++) phi[j]=F2; //for overtone sync
if(BON==1) //noise band 1
{
for(t=tpos; t<=tplus; t++)
{
if(t < envData[5][NEXTT])
envData[5][ENV] = envData[5][ENV] + envData[5][dENV];
else UpdateEnv(5, t);
if((t % BFStep) == 0) BdF = randmax * (float)rand() - 0.5f;
BPhi = BPhi + BF + BQ * BdF;
botmp = t - tpos;
DF[botmp] = DF[botmp] + (float)cos(fmod(BPhi,TwoPi)) * envData[5][ENV] * BL;
}
if(t>=envData[5][MAX]) BON=0;
}
if(BON2==1) //noise band 2
{
for(t=tpos; t<=tplus; t++)
{
if(t < envData[6][NEXTT])
envData[6][ENV] = envData[6][ENV] + envData[6][dENV];
else UpdateEnv(6, t);
if((t % BFStep2) == 0) BdF2 = randmax * (float)rand() - 0.5f;
BPhi2 = BPhi2 + BF2 + BQ2 * BdF2;
botmp = t - tpos;
DF[botmp] = DF[botmp] + (float)cos(fmod(BPhi2,TwoPi)) * envData[6][ENV] * BL2;
}
if(t>=envData[6][MAX]) BON2=0;
}
for (t=tpos; t<=tplus; t++)
{
if(OON==1) //overtones
{
if(t<envData[3][NEXTT])
envData[3][ENV] = envData[3][ENV] + envData[3][dENV];
else
{
if(t>=envData[3][MAX]) //wait for OT2
{
envData[3][ENV] = 0;
envData[3][dENV] = 0;
envData[3][NEXTT] = 999999;
}
else UpdateEnv(3, t);
}
//
if(t<envData[4][NEXTT])
envData[4][ENV] = envData[4][ENV] + envData[4][dENV];
else
{
if(t>=envData[4][MAX]) //wait for OT1
{
envData[4][ENV] = 0;
envData[4][dENV] = 0;
envData[4][NEXTT] = 999999;
}
else UpdateEnv(4, t);
}
//
TphiStart = TphiStart + phi[t - tpos];
if(OF1Sync==1) Ophi1 = TphiStart * OF1; else Ophi1 = Ophi1 + OF1;
if(OF2Sync==1) Ophi2 = TphiStart * OF2; else Ophi2 = Ophi2 + OF2;
Ot=0.0f;
switch (OMode)
{
case 0: //add
Ot = OBal1 * envData[3][ENV] * waveform(Ophi1, OW1);
Ot = OL * (Ot + OBal2 * envData[4][ENV] * waveform(Ophi2, OW2));
break;
case 1: //FM
Ot = ODrive * envData[4][ENV] * waveform(Ophi2, OW2);
Ot = OL * envData[3][ENV] * waveform(Ophi1 + Ot, OW1);
break;
case 2: //RM
Ot = (1 - ODrive / 8) + (((ODrive / 8) * envData[4][ENV]) * waveform(Ophi2, OW2));
Ot = OL * envData[3][ENV] * waveform(Ophi1, OW1) * Ot;
break;
case 3: //808 Cymbal
for(j=0; j<6; j++)
{
Oc[j][0] += 1.0f;
if(Oc[j][0]>Oc[j][1])
{
Oc[j][0] -= Oc[j][1];
Ot = OL * envData[3][ENV];
}
}
Ocf1 = envData[4][ENV] * OcF; //filter freq
Oc0 += Ocf1 * Oc1;
Oc1 += Ocf1 * (Ot + Oc2 - OcQ * Oc1 - Oc0); //bpf
Oc2 = Ot;
Ot = Oc1;
break;
}
}
if(MainFilter==1) //filter overtones
{
if(t<envData[7][NEXTT])
envData[7][ENV] = envData[7][ENV] + envData[7][dENV];
else UpdateEnv(7, t);
MFtmp = envData[7][ENV];
if(MFtmp >0.2f)
MFfb = 1.001f - (float)powf(10.0f, MFtmp - 1);
else
MFfb = 0.999f - 0.7824f * MFtmp;
MFtmp = Ot + MFres * (1.f + (1.f/MFfb)) * (MFin - MFout);
MFin = MFfb * (MFin - MFtmp) + MFtmp;
MFout = MFfb * (MFout - MFin) + MFin;
DF[t - tpos] = DF[t - tpos] + (MFout - (HighPass * Ot));
}
else if(MainFilter==2) //filter all
{
if(t<envData[7][NEXTT])
envData[7][ENV] = envData[7][ENV] + envData[7][dENV];
else UpdateEnv(7, t);
MFtmp = envData[7][ENV];
if(MFtmp >0.2f)
MFfb = 1.001f - (float)powf(10.0f, MFtmp - 1);
else
MFfb = 0.999f - 0.7824f * MFtmp;
MFtmp = DF[t - tpos] + Ot + MFres * (1.f + (1.f/MFfb)) * (MFin - MFout);
MFin = MFfb * (MFin - MFtmp) + MFtmp;
MFout = MFfb * (MFout - MFin) + MFin;
DF[t - tpos] = MFout - (HighPass * (DF[t - tpos] + Ot));
}
// PG: Ot is uninitialized
else DF[t - tpos] = DF[t - tpos] + Ot; //no filter
}
if(DiON==1) //bit resolution
{
for(j=0; j<1200; j++)
DF[j] = DGain * (int)(DF[j] / DAtten);
for(j=0; j<1200; j+=DStep) //downsampling
{
DownAve = 0;
DownStart = j;
DownEnd = j + DStep - 1;
for(jj = DownStart; jj<=DownEnd; jj++)
DownAve = DownAve + DF[jj];
DownAve = DownAve / DStep;
for(jj = DownStart; jj<=DownEnd; jj++)
DF[jj] = DownAve;
}
}
else for(j=0; j<1200; j++) DF[j] *= DGain;
for(j = 0; j<1200; j++) //clipping + output
{
if(DF[j] > clippoint)
wave[wavewords++] = clippoint;
else if(DF[j] < -clippoint)
wave[wavewords++] = -clippoint;
else
wave[wavewords++] = (short)DF[j];
for (int c = 1; c < channels; c++) {
wave[wavewords] = wave[wavewords-1];
wavewords++;
}
}
tpos = tpos + 1200;
}
/*
if(wavemode==0)
{
fwrite(wave, 2, Length, fp); //write data
fwrite(&WI, 1, 44, fp); //write INFO chunk
fwrite(&comment, 1, commentLen, fp);
fclose(fp);
}
wavemode = 0; //force compatibility!!
*/
return Length;
}