altnode.alt-audio-node v0.2.0

altnode.AltAudioNode

Base class for customized AudioNode

Installation

npm install -S altnode.alt-audio-node

API

AltAudioNode

• constructor(audioContext: AudioContext)

Instance attributes

• context: AudioContext

Instance methods

These methods are noop that should be overridden by a subclass.

• connect(...args): void
• disconnect(...args): void
• dispose(): void
  • disconnect and dispose all of the internal nodes

These methods are optional for customized AudioNode.

• __connectFrom(source: global.AudioNode, output = 0, input = 0): void
• __disconnectFrom(source: global.AudioNode, output = 0): void
  • called when connecting/disconnecting from WebAudioAPI's AudioNode

Example

import AltAudioNode from "altnode.alt-audio-node";

export default class FeedbackDelayNode extends AltAudioNode {
  constructor(audioContext, maxDelayTime = 1) {
    super(audioContext);

    this._delay = audioContext.createDelay(maxDelayTime);
    this._feedback = audioContext.createGain();

    this._delay.connect(this._feedback);
    this._feedback.connect(this._delay);
  }

  get delayTime() {
    return this._delay.delayTime;
  }

  get feedback() {
    return this._feedback.gain;
  }

  connect(...args) {
    this._delay.connect(...args);
  }

  disconnect(...args) {
    this._delay.disconnect(...args);
  }

  dispose() {
    this._delay.disconnect();
    this._feedback.disconnect();
    this._delay = null;
    this._feedback = null;
  }

  __connectFrom(source, ...args) {
    source.connect(this._delay, ...args);
  }

  __disconnectFrom(source, ...args) {
    source.disconnect(this._delay, ...args);
  }
}

import FeedbackDelayNode from "./FeedbackDelayNode";

let audioContext = new AudioContext();
let bufSrc = audioContext.createBufferSource();
let delay = new FeedbackDelayNode(audioContext);

bufSrc.buffer = RhythmLoop;
bufSrc.loop = true;
bufSrc.start();
bufSrc.connect(delay); // call delay.__connectFrom with [ bufSrc ]

delay.delayTime.value = 0.75;
delay.feedback.value = 0.9;
delay.connect(audioContext.destination);

LICENSE

MIT