//
// Programmer: Craig Stuart Sapp <craig@ccrma.stanford.edu>
// Creation Date: Fri Apr 21 20:13:47 PDT 2000
// Last Modified: Fri Apr 21 20:13:50 PDT 2000
// Filename: ...sig/doc/examples/all/ripple/ripple.cpp
// Syntax: C++; synthImprov 2.0
//
//
#include "synthImprov.h"
/*----------------- beginning of improvization algorithms ---------------*/
EventBuffer eventBuffer; // for future notes
MidiMessage message; // for reading keyno and velocity (and time)
CircularBuffer<int> lastnotes(100); // for keeping track of melody interval
CircularBuffer<int> lasttimes(100); // for keeping track of melody rate
int duration; // duration of the glissandos
int distancee; // step size of the glissandos
int channel; // channel to play the glissandos on
// function declarations:
void sillyKeyboard(int key, int chan = 0);
void playgliss(int basenote, int loudness, int channel, int duration,
int distancee);
/*--------------------- Event Algorithms --------------------------------*/
//////////////////////////////
//
// EnhanceFunction --
//
// Global variables needed by this function:
// None.
//
// Local variables needed by this function:
// 14 short = interval step between notes
//
static void EnhanceFunction(FunctionEvent& p, EventBuffer& midiOutput) {
static NoteEvent note; // temporary note before placing in buffer
// set the parameters for the output note:
note.setOnDur(t_time, p.getOffTime()); // off time holds dur
note.setVel(p.getVel());
note.setChan(p.getChan());
note.setKey(p.getKey());
// if note is too quiet
if (p.getVel() <= 5) {
p.off(midiOutput);
}
// update the parameters for the function:
p.setKey(p.getKey()+p.shortValue(14));
p.setVel(p.getVel()-5);
p.setOnTime(p.getOnTime() + p.getDur()); // OffTime stores duration
note.activate();
note.action(midiOutput); // start right now, avoiding any buffer delay
midiOutput.insert(note); // the note off message is being buffered
// check wether to kill the algorithm or not:
// if note is off the range of the keyboard
if (p.getKey() > C8 || p.getKey() < A0) {
p.off(midiOutput);
}
}
/*--------------------- maintenance algorithms --------------------------*/
void description(void) {
printboxtop();
psl(
"ripple -- by Craig Stuart Sapp <craig@ccrma.stanford.edu> -- 21 April 2000");
psl("");
psl(
" Description: Creates glissandos when you press a key on the keyboard.");
psl(" Computer keyboard keys are assigned random attack velocities.");
printintermediateline();
psl(" User commands:");
psl(
" \"-\" = decrease step \"=\" = increase step \"\\\" = change "
"direction");
psl(" \"[\" = increase rate \"]\" = decrease rate ");
psl(" \"0\"-\"9\" = octave number of computer keyboard notes");
psl(" Notes: s d g h j ");
psl(" z x c v b n m ");
printboxbottom();
}
void initialization(void) {
eventBuffer.setPollPeriod(10);
lastnotes.reset();
lasttimes.reset();
}
void finishup(void) { }
/*-------------------- main loop algorithms -----------------------------*/
void mainloopalgorithms(void) {
if (eventBuffer.checkPoll()); // see if any notes to play
while (synth.getNoteCount() > 0) {
message = synth.extractNote();
if (message.p2() != 0) {
lastnotes.insert(message.p1());
lasttimes.insert(message.time);
distancee = lastnotes[0] - lastnotes[1];
duration = lasttimes[0] - lasttimes[1];
channel = 0x0f & message.p0();
if (distancee != 0) {
playgliss(message.p1(), message.p2(), channel, duration, distancee);
}
}
}
}
////////////////////////////
//
// playgliss -- inserts a FunctionEvent into the eventBuffer which
// plays a glissando. The glissando will die after the
// note falls off of the keyboard or the volume gets too low.
//
void playgliss(int basenote, int loudness, int channel, int duration,
int distancee) {
static FunctionEvent tn; // a Temporary Note for copying into eventBuffer
// setting the fields of the function note
tn.shortValue(14) = distancee;
tn.setFunction(EnhanceFunction);
tn.setChannel(channel);
tn.setKeyno(basenote + distancee);
tn.setVelocity(loudness - 5);
tn.setStatus(EVENT_STATUS_ACTIVE);
// start time of function and the duration between calling it
tn.setOnDur(t_time, duration);
eventBuffer.insert(tn);
cout << "StartKey = " << basenote
<< "\tLoudness = " << loudness
<< "\tRate = " << duration
<< "\tDirection = " << distancee
<< endl;
}
/*-------------------- triggered algorithms -----------------------------*/
void keyboardchar(int key) {
switch (key) {
default:
sillyKeyboard(key);
}
}
void sillyKeyboard(int key, int chan /* = 0 */) {
static int octave = 4;
static int newkey = 0;
static Voice voice;
static MidiMessage message;
// check to see if adjusting the octave:
if (isdigit(key)) {
octave = key - '0';
return;
}
switch (key) {
case 'z': newkey = 12 * octave + 0; break; // C
case 's': newkey = 12 * octave + 1; break; // C#
case 'x': newkey = 12 * octave + 2; break; // D
case 'd': newkey = 12 * octave + 3; break; // D#
case 'c': newkey = 12 * octave + 4; break; // E
case 'v': newkey = 12 * octave + 5; break; // F
case 'g': newkey = 12 * octave + 6; break; // F#
case 'b': newkey = 12 * octave + 7; break; // G
case 'h': newkey = 12 * octave + 8; break; // G#
case 'n': newkey = 12 * octave + 9; break; // A
case 'j': newkey = 12 * octave + 10; break; // A#
case 'm': newkey = 12 * octave + 11; break; // B
case ',': newkey = 12 * octave + 12; break; // C
case 'l': newkey = 12 * octave + 12; break; // C#
case '.': newkey = 12 * octave + 12; break; // D
case '\'': newkey = 12 * octave + 12; break; // D#
case '/': newkey = 12 * octave + 12; break; // E
default: return; // don't do anything if not a key
}
// prevent any invalid key numbers:
if (newkey < 0) {
newkey = 0;
} else if (newkey > 127) {
newkey = 127;
}
// put note-off message in synth's input buffer:
message.time = t_time;
message.p0() = 0x90 | voice.getChan();
message.p1() = voice.getKey();
message.p2() = 0;
synth.insert(message);
// turn off the last note:
voice.off();
// set parameters for next note-on:
voice.setChan(chan & 0x0f); // limit channel to range from 0 to 15
voice.setVel(rand() % 127 +1); // random attack in range from 1 to 127
voice.setKey(newkey); // use the newly selected key number
// play the MIDI note:
voice.play();
// insert the played note into synth's input MIDI buffer:
message.command() = 0x90 | voice.getChan();
message.p1() = voice.getKey();
message.p2() = voice.getVel();
synth.insert(message);
}
/*------------------ end improvization algorithms -----------------------*/
// md5sum: 0e5fdaf792274b27bc634faf8d4c8ce5 ripple.cpp [20050403]