client/lib/sampler.js


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import Tone from 'tone'
import { choice } from './util'

const player_count = 2

const compressor = new Tone.Compressor(-30, 3).toMaster()
const reverb = new Tone.Freeverb({
  roomSize: 0.2,
  dampening: 12000,
}).connect(compressor)

export default class Sampler {
  constructor(path, count){
    this.samples = (()=>{
      let s = '', a = []
      for (let i = 1; i < count; i++) {
        const s = i < 10 ? '0' + i : i;
        a.push({ root: 100, fn: path.replace(/{}/, s) })
      }
      return a
    })()

    this.samples.forEach((sample) => {
      sample.players = []
      sample.index = -1
      for (let i = 0; i < player_count; i++) {
        let fn = sample.fn
        if (window.location.href.match(/asdf.us/)) {
          fn = 'http://asdf.us/glass/' + fn.replace('wav','mp3')
        }
        let player = new Tone.Player({
          url: fn,
          retrigger: true,
          playbackRate: 1,
        })
        player.connect(reverb)
        sample.players.push(player)
      }
    })

  }
  play(freq, time) {
    const best = { sample: choice(this.samples) }
    best.sample.index = (best.sample.index + 1) % player_count

    const player = best.sample.players[ best.sample.index ]

    freq = freq || best.sample.root
    time = time || Tone.now()

    player.playbackRate = freq / best.sample.root
    player.start(time)
    return player
  }
}