Delete the old hotwording integration.

chrome/browser/resources/app_list/audio_manager.js

-// Copyright 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-/**
- * @fileoverview The manager of audio streams.
- */
-
-cr.define('speech', function() {
-  'use strict';
-
-  /**
-   * The enum of the status of hotword audio recognition.
-   *
-   * @enum {number}
-   */
-  var AudioState = {
-    STOPPED: 0,
-    LISTENING: 1
-  };
-
-  /**
-   * @constructor
-   * @extends {cr.EventTarget}
-   */
-  function AudioManager() {
-    var audioContext = new window.AudioContext();
-    this.sampleRate = audioContext.sampleRate;
-    this.audioProc_ = null;
-    this.audioIn_ = null;
-    this.stream_ = null;
-    this.state = AudioState.STOPPED;
-  };
-
-  AudioManager.prototype.__proto__ = cr.EventTarget.prototype;
-
-  /**
-   * Called when the audio data arrives.
-   *
-   * @param {Event} audioEvent The audio event.
-   * @private
-   */
-  AudioManager.prototype.onAudioProcess_ = function(audioEvent) {
-    var data = audioEvent.inputBuffer.getChannelData(0);
-    var intData = new Int16Array(data.length);
-    for (var i = 0; i < data.length; ++i)
-      intData[i] = Math.round(data[i] * 32767);
-    var event = new Event('audio');
-    event.data = intData;
-    this.dispatchEvent(event);
-  };
-
-  /**
-   * Called when the audio stream is ready.
-   *
-   * @param {MediaStream} stream The media stream which is now available.
-   * @private
-   */
-  AudioManager.prototype.onAudioReady_ = function(stream) {
-    var audioContext = new window.AudioContext();
-    this.stream_ = stream;
-    this.audioIn_ = audioContext.createMediaStreamSource(stream);
-    this.audioProc_ = audioContext.createScriptProcessor(
-        4096 /* buffer size */, 1 /* channels */, 1 /* channels */);
-    this.audioProc_.onaudioprocess = this.onAudioProcess_.bind(this);
-
-    this.audioIn_.connect(this.audioProc_);
-    this.audioProc_.connect(audioContext.destination);
-    this.state = AudioState.LISTENING;
-  };
-
-  /**
-   * Starts the audio processing.
-   */
-  AudioManager.prototype.start = function() {
-    if (this.state == AudioState.LISTENING)
-      return;
-
-    navigator.webkitGetUserMedia(
-        {audio: true},
-        this.onAudioReady_.bind(this),
-        function(msg) { console.error('Failed to getUserMedia: ' + msg); });
-  };
-
-  /**
-   * Stops the audio processing.
-   */
-  AudioManager.prototype.stop = function() {
-    if (this.state != AudioState.LISTENING)
-      return;
-    this.audioProc_.disconnect();
-    this.audioIn_.disconnect();
-    var audioTracks = this.stream_.getAudioTracks();
-    for (var i = 0; i < audioTracks.length; ++i) {
-      audioTracks[i].stop();
-    }
-    this.audioProc_ = null;
-    this.audioIn_ = null;
-    this.stream_ = null;
-    this.state = AudioState.STOPPED;
-  };
-
-  return {
-    AudioManager: AudioManager,
-    AudioState: AudioState
-  };
-});