//========================================================= // 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 #include #include #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 }; // We must compile with -fvisibility=hidden to avoid namespace // conflicts with global variables. // Only visible symbol is "mess_descriptor". // (TODO: all plugins should be compiled this way) __attribute__ ((visibility("default"))) const MESS* mess_descriptor() { return &descriptor; } }