p5.sound.js test - OpenProcessing

mySketch
utils
p5.sound.js
Voice
xxxxxxxxxx
 
let bass, snare, kick, hat, backing, backing2
let startTime
​
function setup() {
  window.getAudioContext = undefined
  createCanvas(windowWidth, windowHeight);
  
  bass = new Voice(new Oscillator(440, 'sine'))
  bass.push(loopNotes([
    { time: '0:0:0', note: 'C2', duration: '0:0:3' },
    { time: '0:1:0', note: 'C2', duration: '0:0:3' },
    { time: '0:2:0', note: 'C3', duration: '0:0:3' },
    
    { time: '1:2:0', note: 'A#3', duration: '0:0:2' },
    { time: '1:2:2', note: 'F#2', duration: '0:0:2' },
    { time: '1:3:0', note: 'F2', duration: '0:0:2' },
    { time: '1:3:2', note: 'D#2', duration: '0:0:2' },
  ], { by: '2:0:0', times: 50 }))
  
  const snareVoice = new Noise('pink')
  snareVoice.connect(new Biquad(800, 'highpass'))
  snare = new Voice(snareVoice)
  snare.push(loopNotes([
    { time: '0:2:0', duration: '0:0:0.8' },
  ], { by: '1:0:0', times: 100 }))
  
  const kickVoice = new Noise('brown')
  kickVoice.connect(new Biquad(100, 'lowpass'))
  kickVoice.noise.volume.value = -5
  kick = new Voice(kickVoice)
  kick.push(loopNotes([
    { time: '0:0:0', duration: '0:0:0.6' },
  ], { by: '1:0:0', times: 100 }))
  
  const hatVoice = new Noise('white')
  hatVoice.connect(new Biquad(1600, 'highpass'))
  hatVoice.noise.volume.value = -20
  hat = new Voice(hatVoice)
  hat.push(offsetNotes(loopNotes([
    { time: '0:0:0', duration: '0:0:0.4' },
    { time: '0:0:2', duration: '0:0:0.2' },
    { time: '0:1:0', duration: '0:0:0.2' },
    { time: '0:1:2', duration: '0:0:0.2' },
    { time: '0:2:0', duration: '0:0:0.4' },
    { time: '0:2:2', duration: '0:0:0.2' },
    { time: '0:3:0', duration: '0:0:0.2' },
    { time: '0:3:2', duration: '0:0:0.2' },
  ], { by: '1:0:0', times: 96 }), { by: '4:0:0'}))
  
  backing = new Voice(new Oscillator(440, 'triangle'))
  backing.osc.osc.volume.value = -20
  backing.push(offsetNotes(loopNotes([
    { time: '0:0:0', note: 'D#4', duration: '0:1:3' },
    { time: '0:2:0', note: 'D#4', duration: '0:1:3' },
  ], { by: '4:0:0', times: 25 }), { by: '6:0:0' }))
  
  backing2 = new Voice(new Oscillator(440, 'triangle'))
  backing2.osc.osc.volume.value = -20
  backing2.push(offsetNotes(loopNotes([
    { time: '0:0:0', note: 'C4', duration: '0:1:3' },
    { time: '0:2:0', note: 'C4', duration: '0:1:3' },
  ], { by: '4:0:0', times: 25 }), { by: '6:0:0' }))
}
​
function draw() {
  background(255)
  
  if (startTime) {
    let delta = millis() - startTime
    const bpm = 170
    const quarter = 60*1000 / bpm
    const bars = Math.floor(delta / (4 * quarter))
    delta -= bars * 4 * quarter
    const quarters = Math.floor(delta / quarter)
    delta -= quarters * quarter
    const sixteenths = delta / (quarter / 4)
    const t = { bars, quarters, sixteenths }
    bass.update(t)
    snare.update(t)
    kick.update(t)
    hat.update(t)
    backing.update(t)
    backing2.update(t)
    
    textAlign(CENTER, CENTER)
    text(`${bars}:${quarters}:${floor(sixteenths)}`, width/2, height/2)
  }
}
​
function mousePressed() {
  startTime = millis()
}