Make availability of hotword hardware known to hotword component extension.

chrome/browser/resources/hotword/nacl_manager.js

 // Copyright 2014 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.
 
 cr.define('hotword', function() {
 'use strict';
 
 /**
  * Class used to manage the state of the NaCl recognizer plugin. Handles all
  * control of the NaCl plugin, including creation, start, stop, trigger, and
  * shutdown.
  *
  * @param {boolean} loggingEnabled Whether audio logging is enabled.
+ * @param {boolean} hotwordStream Whether the audio input stream is from a
+ *     hotword stream.
  * @constructor
  * @extends {cr.EventTarget}
  */
-function NaClManager(loggingEnabled) {
+function NaClManager(loggingEnabled, hotwordStream) {
   /**
    * Current state of this manager.
    * @private {hotword.NaClManager.ManagerState_}
    */
   this.recognizerState_ = ManagerState_.UNINITIALIZED;
 
   /**
    * The window.timeout ID associated with a pending message.
    * @private {?number}
    */
@@ skipping 35 matching lines @@
    */
   this.startMode_ = hotword.constants.RecognizerStartMode.NORMAL;
 
   /**
    * Whether audio logging is enabled.
    * @private {boolean}
    */
   this.loggingEnabled_ = loggingEnabled;
 
   /**
+   * Whether the audio input stream is from a hotword stream.
+   * @private {boolean}
+   */
+  this.hotwordStream_ = hotwordStream;
+
+  /**
    * Audio log of X seconds before hotword triggered.
    * @private {?Object}
    */
   this.preambleLog_ = null;
 };
 
 /**
  * States this manager can be in. Since messages to/from the plugin are
  * asynchronous (and potentially queued), it's not possible to know what state
  * the plugin is in. However, track a state machine for NaClManager based on
@@ skipping 342 matching lines @@
   this.waitForMessage_(hotword.constants.TimeoutMs.LONG,
                        hotword.constants.NaClPlugin.MODEL_LOADED);
 
   // Configure logging in the plugin. This can be configured any time before
   // starting the recognizer, and now is as good a time as any.
   if (this.loggingEnabled_) {
     this.sendDataToPlugin_(
         hotword.constants.NaClPlugin.LOG + ':' +
         hotword.constants.AUDIO_LOG_SECONDS);
   }
+
+  // If the audio stream is from a hotword stream, tell the plugin.
+  if (this.hotwordStream_) {
+    this.sendDataToPlugin_(
+        hotword.constants.NaClPlugin.DSP + ':' +
+        hotword.constants.HOTWORD_STREAM_TIMEOUT_SECONDS);
+  }
 };
 
 /**
  * Handle a MODEL_LOADED message from the plugin.
  * The plugin sends this message after successfully loading the language model.
  * @private
  */
 NaClManager.prototype.handleModelLoaded_ = function() {
   if (this.recognizerState_ != ManagerState_.LOADING) {
     return;
@@ skipping 127 matching lines @@
         break;
     }
   }
 };
 
 return {
   NaClManager: NaClManager
 };
 
 });