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Diffstat (limited to 'muse2/synti/s1/s1.cpp')
| -rw-r--r-- | muse2/synti/s1/s1.cpp | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/muse2/synti/s1/s1.cpp b/muse2/synti/s1/s1.cpp new file mode 100644 index 00000000..c73615bd --- /dev/null +++ b/muse2/synti/s1/s1.cpp @@ -0,0 +1,227 @@ +//========================================================= +// MusE +// Linux Music Editor +// $Id: s1.cpp,v 1.9.2.5 2009/11/19 04:20:33 terminator356 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 <qmessagebox.h> +#include <stdio.h> + +#include "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; + bool _showGui; + + int param; + + virtual void note(int channel, int pitch, int velo); + //virtual void processMessages(); + virtual void process(float** buffer, int offset, int n); + virtual bool hasGui() const { return true; } + virtual bool guiVisible() const { return _showGui; } + virtual void showGui(bool); + virtual bool setController(int channel, int ctrl, int val); + virtual int getControllerInfo(int id, const char** name, int* ctrl, int* min, int* max, int* initval) const; + + 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; + + param = 0; + + _showGui=false; + showGui(true); + } + +//--------------------------------------------------------- +// ~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; + float sample1, sample2; + 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; + + sample1 = wave_table[accu >> 8]; // sinus component + + if (sample1< 0.0f) // square wave component + sample2 = -0.4; + else + sample2 = 0.4; + + sample = ((1.0-float(param)/127.0)*sample1 + (float(param)/127.0)*sample2) / 2.0; + + // + // 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 +//--------------------------------------------------------- + + +void S1::showGui(bool show) + { + if (show) + QMessageBox::information( NULL, "S1", + "S1 is a demo synth mainly for\n" + "developers wishing to learn\n" + "how to make a M.E.S.S synth.\n" + "\n" + "One modulation parameter is available,\n" + "it sweeps the signal between square and\n" + "sinus wave.\n", 1 ); + } + +bool S1::setController(int, int ctrl, int val) + { + if (ctrl == 1) { + param = val; + } + return true; + } + +int S1::getControllerInfo(int id, const char** name, int* ctrl, int* min, int* max, int* initval) const + { + if (id == 0) { + *name = "Modulation"; + *ctrl = 1; + *min = 0; + *max = 127; + *initval = 0; + return 1; + } + else + return 0; + } + +//--------------------------------------------------------- +// inst +//--------------------------------------------------------- +class QWidget; + + +static Mess* instantiate(int sr, QWidget*, QString* projectPathPtr, 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; } + } + |