chrome/test/data/webrtc/webaudio.js

   1 /**
   2  * Copyright (c) 2013 The Chromium Authors. All rights reserved.
   3  * Use of this source code is governed by a BSD-style license that can be
   4  * found in the LICENSE file.
   5  */
   6
   7 var gContext = null;
   8
   9 function loadAudioAndAddToPeerConnection(url, peerconnection) {
  10   if (gContext == null)
  11     gContext = new webkitAudioContext();
  12
  13   var inputSink = gContext.createMediaStreamDestination();
  14   peerconnection.addStream(inputSink.stream);
  15
  16   loadAudioBuffer_(url, function(voiceSoundBuffer) {
  17     if (peerconnection.webAudioBufferSource)
  18       throw failTest('Cannot load more than one sound per peerconnection.');
  19
  20     peerconnection.inputSink = inputSink;
  21     peerconnection.webAudioBufferSource = gContext.createBufferSource();
  22     peerconnection.webAudioBufferSource.buffer = voiceSoundBuffer;
  23     peerconnection.webAudioBufferSource.connect(inputSink);
  24     returnToTest('ok-added');
  25   });
  26 }
  27
  28 function mixLocalStreamIntoPeerConnection(peerconnection, localStream) {
  29   if (!peerconnection.inputSink)
  30     throw failTest('Must call loadAudioAndAddToPeerConnection before this.');
  31   micInputNode = gContext.createMediaStreamSource(localStream);
  32   micInputNode.connect(peerconnection.inputSink);
  33   returnToTest('ok-mixed-in');
  34 }
  35
  36 function playPreviouslyLoadedAudioFile(peerconnection) {
  37   if (!peerconnection.webAudioBufferSource)
  38     throw failTest('Must call loadAudioAndAddToPeerConnection before this.');
  39   peerconnection.webAudioBufferSource.start(gContext.currentTime);
  40 }
  41
  42 /** @private */
  43 function loadAudioBuffer_(url, callback) {
  44   var request = new XMLHttpRequest();
  45   request.open('GET', url, true);
  46   request.responseType = 'arraybuffer';
  47
  48   request.onload = function() {
  49     voiceSoundBuffer = gContext.createBuffer(request.response, false);
  50     callback(voiceSoundBuffer);
  51   }
  52   request.send();
  53 }