Beepody / beepody

/**

 * @class Tone player

 * @name Tone

 */

export class Tone {

  ctx: AudioContext

  gainNode: GainNode

  outNode: AudioDestinationNode

  /**

   * Initialize a tone beeper.

   */

  /* istanbul ignore next */

  constructor() {

    if (

      typeof window !== 'undefined' &&

      typeof window.AudioContext !== 'undefined'

    ) {

      this.ctx = new window.AudioContext()

      this.gainNode = this.ctx.createGain()

      this.gainNode.gain.value = 1 / 8

      this.outNode = this.ctx.destination

      this.gainNode.connect(this.outNode)

    } else {

      throw 'AudioContext is required'

    }

  }

  /**

   * Play a beep after wait seconds, stopping after length seconds.

   */

  /* istanbul ignore next */

  beepOnBeepOff(frequency: number, length: number, wait: number): void {

    const osc = this.ctx.createOscillator()

    osc.type = 'square'

    osc.frequency.value = frequency

    osc.connect(this.gainNode)

    osc.start(wait)

    osc.stop(wait + length)

  }

}

export default Tone