mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-17 16:26:39 +03:00
Michelle Zhuo
a09ae24b85
Added a preferred audio channel count to configuration, default set to 2. Choose the codec with the largest number of audio channels less than or equal to the configured number of output channels. If this is not possible, choose the smallest number of channels. Closes #1013. Issue #1071. Change-Id: I6c6a956e33637cf34bd4bd79af563dc10a595e94
82 lines
2.2 KiB
JavaScript
82 lines
2.2 KiB
JavaScript
/**
|
|
* @license
|
|
* Copyright 2016 Google Inc.
|
|
*
|
|
* Licensed 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.
|
|
*/
|
|
|
|
goog.provide('shaka.util.MimeUtils');
|
|
|
|
|
|
/**
|
|
* @namespace shaka.util.MimeUtils
|
|
* @summary A set of utility functions for dealing with MIME types.
|
|
*/
|
|
|
|
|
|
/**
|
|
* Takes a MIME type and optional codecs string and produces the full MIME type.
|
|
*
|
|
* @param {string} mimeType
|
|
* @param {string=} opt_codecs
|
|
* @return {string}
|
|
*/
|
|
shaka.util.MimeUtils.getFullType = function(mimeType, opt_codecs) {
|
|
let fullMimeType = mimeType;
|
|
if (opt_codecs) {
|
|
fullMimeType += '; codecs="' + opt_codecs + '"';
|
|
}
|
|
return fullMimeType;
|
|
};
|
|
|
|
|
|
/**
|
|
* Takes a Stream object and produces an extended MIME type with information
|
|
* beyond the container and codec type, when available.
|
|
*
|
|
* @param {shakaExtern.Stream} stream
|
|
* @return {string}
|
|
*/
|
|
shaka.util.MimeUtils.getExtendedType = function(stream) {
|
|
let mimeType = stream.mimeType;
|
|
|
|
for (let streamKey in shaka.util.MimeUtils.EXTENDED_MIME_PARAMETERS_) {
|
|
let value = stream[streamKey];
|
|
let mimeKey = shaka.util.MimeUtils.EXTENDED_MIME_PARAMETERS_[streamKey];
|
|
if (value) {
|
|
mimeType += '; ' + mimeKey + '="' + value + '"';
|
|
}
|
|
}
|
|
|
|
return mimeType;
|
|
};
|
|
|
|
|
|
/**
|
|
* A map from Stream object keys to MIME type parameters. These should be
|
|
* ignored by platforms that do not recognize them.
|
|
*
|
|
* This initial set of parameters are all recognized by Chromecast.
|
|
*
|
|
* @const {!Object.<string, string>}
|
|
* @private
|
|
*/
|
|
shaka.util.MimeUtils.EXTENDED_MIME_PARAMETERS_ = {
|
|
'codecs': 'codecs',
|
|
'frameRate': 'framerate', // Ours is camelCase, theirs is lowercase.
|
|
'bandwidth': 'bitrate', // Thankfully these are in the same unit, bits/sec.
|
|
'width': 'width',
|
|
'height': 'height',
|
|
'channelCount': 'channels'
|
|
};
|