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