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authorRobert Jonsson <spamatica@gmail.com>2011-03-07 19:01:11 +0000
committerRobert Jonsson <spamatica@gmail.com>2011-03-07 19:01:11 +0000
commite40fc849149dd97c248866a4a1d026dda5e57b62 (patch)
treeb12b358f3b3a0608001d30403358f8443118ec5f /attic/muse_qt4_evolution/synti/s1/s1.cpp
parent1bd4f2e8d9745cabb667b043171cad22c8577768 (diff)
clean3
Diffstat (limited to 'attic/muse_qt4_evolution/synti/s1/s1.cpp')
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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; }
+ }
+