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//=========================================================
// MusE
// Linux Music Editor
// $Id: s1.cpp,v 1.10 2005/01/13 21:16:27 wschweer Exp $
//
// S1 - simple mono demo synthesizer
// - plays only one note at a time
// - has no gui nor any controller
//
// Version 0.2: stop note on wave zero crossing to avoid
// clicks
//
// (C) Copyright 2001-2004 Werner Schweer (ws@seh.de)
//=========================================================
#include <cmath>
#include <list>
#include "synti/libsynti/mono.h"
#define RESOLUTION 16384
//---------------------------------------------------------
// S1 - simple mono demo synthesizer
//---------------------------------------------------------
class S1 : public MessMono {
static int useCount;
static float *wave_table;
int gate;
float freq;
unsigned accu;
float sample;
virtual void note(int channel, int pitch, int velo);
virtual void process(float** buffer, int offset, int n);
public:
S1();
~S1();
};
float* S1::wave_table;
int S1::useCount = 0;
//---------------------------------------------------------
// S1
//---------------------------------------------------------
S1::S1() : MessMono()
{
if (useCount++ == 0) {
//
// create sinus wave table
//
wave_table = new float[RESOLUTION];
for (int i = 0; i < RESOLUTION; i++)
wave_table[i] = sin ((i * 2.0 * M_PI) / RESOLUTION) / 6.0;
}
gate = 0;
}
//---------------------------------------------------------
// ~S1
//---------------------------------------------------------
S1::~S1()
{
if (--useCount == 0)
delete[] wave_table;
}
//---------------------------------------------------------
// noteon
// process note on
//---------------------------------------------------------
void S1::note(int /*channel*/, int pitch, int velo)
{
if (velo == 0) {
//
// note off
//
if (sample == 0.0)
gate = 0;
else if (sample > 0.0)
gate = 2;
else if (sample < 0.0)
gate = 3;
}
else {
//
// note on
//
accu = 0;
gate = 1;
freq = 8.176 * exp(float(pitch)*log(2.0)/12.0);
}
}
//---------------------------------------------------------
// write
// synthesize n samples into buffer+offset
//---------------------------------------------------------
void S1::process(float** buffer, int offset, int n)
{
if (gate == 0)
return;
float* p = buffer[0] + offset;
unsigned freq_256 = (int) (freq * ((double) RESOLUTION) / sampleRate() * 256.0);
for (int i = 0; i < n; i++) {
accu += freq_256;
while (accu >= RESOLUTION * 256)
accu -= RESOLUTION * 256;
sample = wave_table[accu >> 8];
//
// stop on zero crossing
// if in decay state
//
if (gate == 2 && sample <= 0.0) {
gate = 0;
break;
}
else if (gate == 3 && sample >= 0.0) {
gate = 0;
break;
}
p[i] += sample;
}
}
//---------------------------------------------------------
// inst
//---------------------------------------------------------
static Mess* instantiate(int sr, const char*)
{
S1* s1 = new S1();
s1->setSampleRate(sr);
return s1;
}
extern "C" {
static MESS descriptor = {
"S1",
"S1 MusE Demo Software Synthesizer",
"0.2", // version string
MESS_MAJOR_VERSION, MESS_MINOR_VERSION,
instantiate
};
const MESS* mess_descriptor() { return &descriptor; }
}
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