mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-26 17:46:26 +03:00
Michelle Zhuo
82 lines
2.2 KiB
JavaScript
82 lines
2.2 KiB
JavaScript
/**
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* @license
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* Copyright 2016 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* 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, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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goog.provide('shaka.util.MimeUtils');
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/**
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* @namespace shaka.util.MimeUtils
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* @summary A set of utility functions for dealing with MIME types.
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*/
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/**
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* Takes a MIME type and optional codecs string and produces the full MIME type.
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*
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* @param {string} mimeType
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* @param {string=} codecs
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* @return {string}
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*/
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shaka.util.MimeUtils.getFullType = function(mimeType, codecs) {
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let fullMimeType = mimeType;
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if (codecs) {
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fullMimeType += '; codecs="' + codecs + '"';
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}
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return fullMimeType;
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};
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/**
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* Takes a Stream object and produces an extended MIME type with information
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* beyond the container and codec type, when available.
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*
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* @param {shaka.extern.Stream} stream
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* @return {string}
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*/
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shaka.util.MimeUtils.getExtendedType = function(stream) {
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let mimeType = stream.mimeType;
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for (let streamKey in shaka.util.MimeUtils.EXTENDED_MIME_PARAMETERS_) {
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let value = stream[streamKey];
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let mimeKey = shaka.util.MimeUtils.EXTENDED_MIME_PARAMETERS_[streamKey];
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if (value) {
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mimeType += '; ' + mimeKey + '="' + value + '"';
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}
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}
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return mimeType;
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};
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/**
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* A map from Stream object keys to MIME type parameters. These should be
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* ignored by platforms that do not recognize them.
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*
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* This initial set of parameters are all recognized by Chromecast.
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*
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* @const {!Object.<string, string>}
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* @private
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*/
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shaka.util.MimeUtils.EXTENDED_MIME_PARAMETERS_ = {
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'codecs': 'codecs',
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'frameRate': 'framerate', // Ours is camelCase, theirs is lowercase.
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'bandwidth': 'bitrate', // Thankfully these are in the same unit, bits/sec.
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'width': 'width',
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'height': 'height',
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'channelsCount': 'channels'
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};
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