Embeds offline voice recognizer plugin and its manager to app-list start page.

chrome/browser/resources/app_list/speech_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 class to Manage both offline / online speech recognition.
+ */
+
+<include src="plugin_manager.js"/>
+<include src="audio_manager.js"/>
+<include src="speech_recognition_manager.js"/>
+
+cr.define('speech', function() {
+  'use strict';
+
+  /**
+   * The state of speech recognition.
+   *
+   * @enum {string}
+   */
+  var SpeechState = {
+    UNINITIALIZED: 'UNINITIALIZED',
+    READY: 'READY',
+    HOTWORD_RECOGNIZING: 'HOTWORD_RECOGNIZING',
+    RECOGNIZING: 'RECOGNIZING'
+  };
+
+  /**
+   * @constructor
+   */
+  function SpeechManager() {
+    this.audioManager_ = new speech.AudioManager(
+        this.onHotwordRecognizerReady_.bind(this),
+        this.onHotwordRecognizing_.bind(this),
+        this.onHotwordRecognized_.bind(this));
+    this.speechRecognitionManager_ = new speech.SpeechRecognitionManager(this);
+    this.setState_(SpeechState.UNINITIALIZED);
+  }
+
+  /**
+   * Updates the state.
+   *
+   * @param {SpeechState} newState The new state.
+   * @private
+   */
+  SpeechManager.prototype.setState_ = function(newState) {
+    this.state = newState;
+    console.log('speech state: ' + newState);
+  };
+
+  /**
+   * Called when the hotword recognizer is ready.
+   *
+   * @private
+   */
+  SpeechManager.prototype.onHotwordRecognizerReady_ = function() {
+    this.setState_(SpeechState.READY);
+  };
+
+  /**
+   * Called when the hotword is recognized.
+   *
+   * @param {number} confidence The confidence store of the recognition.
+   * @private
+   */
+  SpeechManager.prototype.onHotwordRecognized_ = function(confidence) {
+    if (this.state != SpeechState.HOTWORD_RECOGNIZING)
+      return;
+    this.audioManager_.stop();
+    this.setState_(SpeechState.READY);
+    this.speechRecognitionManager_.start();
+  };
+
+  /**
+   * Called when the hotword recognition has started.
+   *
+   * @private
+   */
+  SpeechManager.prototype.onHotwordRecognizing_ = function() {
+    this.setState_(SpeechState.HOTWORD_RECOGNIZING);
+  };
+
+  /**
+   * Called when the speech recognition has happened.
+   *
+   * @param {string} result The speech recognition result.
+   * @param {boolean} isFinal Whether the result is final or not.
+   */
+  SpeechManager.prototype.onSpeechRecognized = function(result, isFinal) {
+    // TODO(mukai): updates the UI, make requests, and/or sends the result
+    // to the web_ui handler.
+    console.log('speech result: ' + result + ' ' +
+        (isFinal ? 'final' : 'interim'));
+  };
+
+  /**
+   * Called when the speech recognition has started.
+   */
+  SpeechManager.prototype.onSpeechRecognitionStarted = function() {
+    this.setState_(SpeechState.RECOGNIZING);
+  };
+
+  /**
+   * Called when the speech recognition has ended.
+   */
+  SpeechManager.prototype.onSpeechRecognitionEnded = function() {
+    // Restarts the hotword recognition.
+    this.audioManager_.start();
+  };
+
+  /**
+   * Called when an error happened during the speech recognition.
+   *
+   * @param {Error} e The error object.
+   */
+  SpeechManager.prototype.onSpeechRecognitionError = function(e) {
+    this.setState_(SpeechState.UNINITIALIZED);
+  };
+
+  /**
+   * Starts the speech recognition session.
+   */
+  SpeechManager.prototype.start = function() {
+    if (this.state == SpeechState.UNINITIALIZED) {
+      console.warn('hotword recognizer is not yet initialized');
+      return;
+    }
+
+    if (this.state != SpeechState.READY) {
+      console.warn('Already in recognition state...');
+      return;
+    }
+
+    this.audioManager_.start();
+  };
+
+  /**
+   * Stops the speech recognition session.
+   */
+  SpeechManager.prototype.stop = function() {
+    if (this.state == SpeechState.UNINITIALIZED)
+      return;
+
+    this.audioManager_.stop();
+    this.speechRecognitionManager_.stop();
+    this.setState_(SpeechState.READY);
+  };
+
+  return {
+    SpeechManager: SpeechManager
+  };
+});