import processing.sound.*;
AmpplitudeEnvelope env;
Track track;
void setup() {
frameRate(1000);
JSONObject json = new JSONObject();
json.setFloat("attack", 0.8);
json.setFloat("sustain", 0.9);
json.setFloat("release", 1.2);
json.setFloat("level", 0.8);
track = new Track( new SoundFile(this, "zvonkohra.wav") );
track.sample.loop();
env = new AmpplitudeEnvelope(json);
}
void draw() {
env.update();
}
void mousePressed() {
env.reset();
}
class Track {
SoundFile sample;
Track(SoundFile fil) {
sample = fil;
}
}
//custom envelopes class - i want to operate on existing samples + let them play
class AmpplitudeEnvelope {
float attack; //in seconds
float sustain;
float release;
float level;//between 0-1
Track audiotrack = null; //reference to existing track with SoundFile object
long started = 0;//when we start attack
int state = 0;//0=attack,1=sustain,2=release,3=ended
float amplitude = 0.0;
AmpplitudeEnvelope(JSONObject json) {
this.attack = json.getFloat("attack");
this.sustain = json.getFloat("sustain");
this.release = json.getFloat("release");
this.level = json.getFloat("level");
this.audiotrack = track;
}
void reset() {
started = millis();
amplitude = 0.0; //start silent
println("envelope triggered");
}
void update() {
float delta = (millis()-started)/1000.0;
//println(delta);
if ( delta<attack) { //attack
state = 0;
amplitude = map( delta, 0, attack, 0, level);//where we are at current curve for volume change
} else if ( delta>attack && delta<attack+sustain) { //sustain
state = 1;
amplitude = level;
} else if ( delta>attack+sustain && delta<attack+sustain+release ) { //release
state = 2;
amplitude = map( (delta-attack-sustain), 0, release, level, 0);//where we are at current curve for volume change
} else if ( delta>attack+sustain+release ) {
state = 3; //finished
amplitude = 0.0;
}
//----
if (this.audiotrack!=null) {
if ( this.audiotrack.sample != null) {
this.audiotrack.sample.amp(amplitude);
//println(this.amplitude);
}
}
//----
}
}
Hi,
I am getting noticeable glitches / noise when using amp(float volume) continuously. Example with custom Envelope function - code below. Tested on Linux Mint.