react-native-audio-api/lib/module/Audio/AudioFileSourceNode.js

react-native-audio-api provides system for controlling audio in React Native environment compatible with Web Audio API specification

"use strict";

import { AudioEventEmitter } from "../events/index.js";
import AudioScheduledSourceNode from "../core/AudioScheduledSourceNode.js";
const MAX_PLAYBACK_RATE = 4;
export class AudioFileSourceNode extends AudioScheduledSourceNode {
  emitter = new AudioEventEmitter(globalThis.AudioEventEmitter);
  attach(options) {
    this.resetNodeAndSubscriptions();
    const sub = this.emitter.addAudioEventListener('ended', _event => {
      options.onEnded();
    });
    this.node.onEnded = sub.subscriptionId;
    return {
      duration: this.node.duration
    };
  }
  dispose() {
    this.resetNodeAndSubscriptions();
  }
  play() {
    this.node.start(this.context.currentTime);
  }
  pause() {
    this.node.pause();
  }
  seekToTime(seconds) {
    this.node.seekToTime(seconds);
  }
  setVolume(value) {
    this.node.volume = value;
  }
  setLoop(value) {
    this.node.loop = value;
  }
  setPlaybackRate(value) {
    if (!Number.isFinite(value) || value < 0 || value > MAX_PLAYBACK_RATE) {
      throw new Error(`AudioFileSourceNode: playbackRate must be a non-negative number, less than or equal to ${MAX_PLAYBACK_RATE}.`);
    }
    this.node.playbackRate = value;
  }
  setPreservesPitch(value) {
    this.node.preservesPitch = value;
  }
  getFileSourceNode() {
    return this.node;
  }
  getDuration() {
    return this.node.duration;
  }
  getCurrentTime() {
    return this.node.currentTime;
  }
  startPositionTracking(onTime) {
    if (!this.node) {
      return;
    }
    this.stopPositionTracking();
    const sub = this.emitter.addAudioEventListener('positionChanged', event => {
      onTime(event.value);
    });
    this.node.onPositionChanged = sub.subscriptionId;
  }
  stopPositionTracking() {
    if (this.node) {
      this.node.onPositionChanged = '0';
    }
  }
  resetNodeAndSubscriptions() {
    if (this.node) {
      this.node.onPositionChanged = '0';
      this.node.onEnded = '0';
      this.node.disconnect(undefined);
    }
  }
}
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