chrome/browser/resources/whispernet_proxy/js/init.js

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 'use strict';
   6
   7 // Global holding our NaclBridge.
   8 var whispernetNacl = null;
   9
  10 // Encoders and decoders for each client.
  11 var whisperEncoders = {};
  12 var whisperDecoders = {};
  13
  14 /**
  15  * Initialize the whispernet encoder and decoder.
  16  * Call this before any other functions.
  17  * @param {string} clientId A string identifying the requester.
  18  * @param {Object} audioParams Audio parameters for token encoding and decoding.
  19  */
  20 function audioConfig(clientId, audioParams) {
  21   if (!whispernetNacl) {
  22     chrome.copresencePrivate.sendInitialized(false);
  23     return;
  24   }
  25
  26   console.log('Configuring encoder and decoder for client ' + clientId);
  27   whisperEncoders[clientId] =
  28       new WhisperEncoder(audioParams.paramData, whispernetNacl, clientId);
  29   whisperDecoders[clientId] =
  30       new WhisperDecoder(audioParams.paramData, whispernetNacl, clientId);
  31 }
  32
  33 /**
  34  * Sends a request to whispernet to encode a token.
  35  * @param {string} clientId A string identifying the requester.
  36  * @param {Object} params Encode token parameters object.
  37  */
  38 function encodeTokenRequest(clientId, params) {
  39   if (whisperEncoders[clientId]) {
  40     whisperEncoders[clientId].encode(params);
  41   } else {
  42     console.error('encodeTokenRequest: Whisper not initialized for client ' +
  43         clientId);
  44   }
  45 }
  46
  47 /**
  48  * Sends a request to whispernet to decode samples.
  49  * @param {string} clientId A string identifying the requester.
  50  * @param {Object} params Process samples parameters object.
  51  */
  52 function decodeSamplesRequest(clientId, params) {
  53   if (whisperDecoders[clientId]) {
  54     whisperDecoders[clientId].processSamples(params);
  55   } else {
  56     console.error('decodeSamplesRequest: Whisper not initialized for client ' +
  57         clientId);
  58   }
  59 }
  60
  61 /**
  62  * Initialize our listeners and signal that the extension is loaded.
  63  */
  64 function onWhispernetLoaded() {
  65   console.log('init: Nacl ready!');
  66
  67   // Setup all the listeners for the private API.
  68   chrome.copresencePrivate.onConfigAudio.addListener(audioConfig);
  69   chrome.copresencePrivate.onEncodeTokenRequest.addListener(encodeTokenRequest);
  70   chrome.copresencePrivate.onDecodeSamplesRequest.addListener(
  71       decodeSamplesRequest);
  72
  73   // This first initialized is sent to indicate that the library is loaded.
  74   // Every other time, it will be sent only when Chrome wants to reinitialize
  75   // the encoder and decoder.
  76   chrome.copresencePrivate.sendInitialized(true);
  77 }
  78
  79 /**
  80  * Initialize the whispernet Nacl bridge.
  81  */
  82 function initWhispernet() {
  83   console.log('init: Starting Nacl bridge.');
  84   // TODO(rkc): Figure out how to embed the .nmf and the .pexe into component
  85   // resources without having to rename them to .js.
  86   whispernetNacl = new NaclBridge('whispernet_proxy.nmf.png',
  87                                   onWhispernetLoaded);
  88 }
  89
  90 window.addEventListener('DOMContentLoaded', initWhispernet);