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<h1 class="page-title">Source: main/webapp/modules/RawAudioFormat.js</h1>
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<pre class="prettyprint source linenums"><code>/*
* 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 || {};
/**
* A description of the format of raw PCM audio, such as that used by
* Guacamole.RawAudioPlayer and Guacamole.RawAudioRecorder. This object
* describes the number of bytes per sample, the number of channels, and the
* overall sample rate.
*
* @constructor
* @param {!(Guacamole.RawAudioFormat|object)} template
* The object whose properties should be copied into the corresponding
* properties of the new Guacamole.RawAudioFormat.
*/
Guacamole.RawAudioFormat = function RawAudioFormat(template) {
/**
* The number of bytes in each sample of audio data. This value is
* independent of the number of channels.
*
* @type {!number}
*/
this.bytesPerSample = template.bytesPerSample;
/**
* The number of audio channels (ie: 1 for mono, 2 for stereo).
*
* @type {!number}
*/
this.channels = template.channels;
/**
* The number of samples per second, per channel.
*
* @type {!number}
*/
this.rate = template.rate;
};
/**
* Parses the given mimetype, returning a new Guacamole.RawAudioFormat
* which describes the type of raw audio data represented by that mimetype. If
* the mimetype is not a supported raw audio data mimetype, null is returned.
*
* @param {!string} mimetype
* The audio mimetype to parse.
*
* @returns {Guacamole.RawAudioFormat}
* A new Guacamole.RawAudioFormat which describes the type of raw
* audio data represented by the given mimetype, or null if the given
* mimetype is not supported.
*/
Guacamole.RawAudioFormat.parse = function parseFormat(mimetype) {
var bytesPerSample;
// Rate is absolutely required - if null is still present later, the
// mimetype must not be supported
var rate = null;
// Default for both "audio/L8" and "audio/L16" is one channel
var channels = 1;
// "audio/L8" has one byte per sample
if (mimetype.substring(0, 9) === 'audio/L8;') {
mimetype = mimetype.substring(9);
bytesPerSample = 1;
}
// "audio/L16" has two bytes per sample
else if (mimetype.substring(0, 10) === 'audio/L16;') {
mimetype = mimetype.substring(10);
bytesPerSample = 2;
}
// All other types are unsupported
else
return null;
// Parse all parameters
var parameters = mimetype.split(',');
for (var i = 0; i &lt; parameters.length; i++) {
var parameter = parameters[i];
// All parameters must have an equals sign separating name from value
var equals = parameter.indexOf('=');
if (equals === -1)
return null;
// Parse name and value from parameter string
var name = parameter.substring(0, equals);
var value = parameter.substring(equals+1);
// Handle each supported parameter
switch (name) {
// Number of audio channels
case 'channels':
channels = parseInt(value);
break;
// Sample rate
case 'rate':
rate = parseInt(value);
break;
// All other parameters are unsupported
default:
return null;
}
};
// The rate parameter is required
if (rate === null)
return null;
// Return parsed format details
return new Guacamole.RawAudioFormat({
bytesPerSample : bytesPerSample,
channels : channels,
rate : rate
});
};
</code></pre>
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