| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| var Guacamole = Guacamole || {}; |
| |
| /** |
| * Maintains a singleton instance of the Web Audio API AudioContext class, |
| * instantiating the AudioContext only in response to the first call to |
| * getAudioContext(), and only if no existing AudioContext instance has been |
| * provided via the singleton property. Subsequent calls to getAudioContext() |
| * will return the same instance. |
| * |
| * @namespace |
| */ |
| Guacamole.AudioContextFactory = { |
| |
| /** |
| * A singleton instance of a Web Audio API AudioContext object, or null if |
| * no instance has yes been created. This property may be manually set if |
| * you wish to supply your own AudioContext instance, but care must be |
| * taken to do so as early as possible. Assignments to this property will |
| * not retroactively affect the value returned by previous calls to |
| * getAudioContext(). |
| * |
| * @type {AudioContext} |
| */ |
| 'singleton' : null, |
| |
| /** |
| * Returns a singleton instance of a Web Audio API AudioContext object. |
| * |
| * @return {AudioContext} |
| * A singleton instance of a Web Audio API AudioContext object, or null |
| * if the Web Audio API is not supported. |
| */ |
| 'getAudioContext' : function getAudioContext() { |
| |
| // Fallback to Webkit-specific AudioContext implementation |
| var AudioContext = window.AudioContext || window.webkitAudioContext; |
| |
| // Get new AudioContext instance if Web Audio API is supported |
| if (AudioContext) { |
| try { |
| |
| // Create new instance if none yet exists |
| if (!Guacamole.AudioContextFactory.singleton) |
| Guacamole.AudioContextFactory.singleton = new AudioContext(); |
| |
| // Return singleton instance |
| return Guacamole.AudioContextFactory.singleton; |
| |
| } |
| catch (e) { |
| // Do not use Web Audio API if not allowed by browser |
| } |
| } |
| |
| // Web Audio API not supported |
| return null; |
| |
| } |
| |
| }; |