pi-rfid-jukebox/jukebox/media-player.js

"use strict";

const throttle = require('throttle-debounce/throttle');

const ChildProcessEmitter = require('./child-process').ChildProcessEmitter;

const DEFAULT_PAUSE_THROTTLE = 2000;
const DEFAULT_PLAY_THROTTLE = 5000;

class MediaPlayer extends ChildProcessEmitter {
  constructor(config, logger) {
    super(config.mpg321, logger);

    this.stderrFilters.push(line => {
      return line.substr(0, 3) == '@F '
    });

    this.pauseThrottled = throttle(config.pause_throttle || DEFAULT_PAUSE_THROTTLE, () => {
      this._pause();
    });

    this.playFileThrottled = throttle(config.play_throttle || DEFAULT_PLAY_THROTTLE, (path) => {
      this._playFile(path);
    });

    // default to unthrottled
    this.pause = this._pauseFile;
    this.playFile = this._playFile;
  }

  throttle() {
    this.pause = this.pauseThrottled;
    this.playFile = this.playFileThrottled;
  }

  stop() {
    this.send('STOP');
  }

  _pause() {
    this.send('PAUSE');
  }

  _playFile(path) {
    this.send("LOAD " + path);
  }
}

module.exports = function(config, logger) {
  return new MediaPlayer(config, logger);
};

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