mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-25 17:45:03 +03:00
Joey Parrish
4cc4e96dbd
* Updates all Copyright years to 2015. * Adds licenses annotations to all JS. * Makes all licenses identical to avoid repeated appearance in the compiled output. * Drops fileoverview annotations, which do not affect docs output. * The linter still requires fileoverview on externs. This patch required a newer closure compiler, since the previous version we used had a bug regarding license annotations that caused the license comment block to appear in the output once per file regardless of uniqueness. Change-Id: I2e9272db680cba7ecc4613d97f1d3a94ac2244cc
140 lines
3.8 KiB
JavaScript
140 lines
3.8 KiB
JavaScript
/**
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* @license
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* Copyright 2015 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.media.StreamInfoProcessor');
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goog.require('shaka.log');
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goog.require('shaka.media.PeriodInfo');
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goog.require('shaka.media.StreamInfo');
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goog.require('shaka.media.StreamSetInfo');
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goog.require('shaka.player.Player');
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/**
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* Creates a StreamInfoProcessor, which chooses the streams that the
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* application and browser can support, and sorts StreamInfos.
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*
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* @constructor
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* @struct
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*/
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shaka.media.StreamInfoProcessor = function() {};
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/**
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* Processes the given PeriodInfos.
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* This function modifies |periodInfos| but does not take ownership of it.
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*
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* @param {!Array.<shaka.media.PeriodInfo>} periodInfos
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*/
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shaka.media.StreamInfoProcessor.prototype.process = function(periodInfos) {
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this.filterPeriodInfos_(periodInfos);
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this.sortStreamSetInfos_(periodInfos);
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};
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/**
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* Removes unsupported StreamInfos from |periodInfos|.
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*
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* @param {!Array.<!shaka.media.PeriodInfo>} periodInfos
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* @private
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*/
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shaka.media.StreamInfoProcessor.prototype.filterPeriodInfos_ = function(
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periodInfos) {
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for (var i = 0; i < periodInfos.length; ++i) {
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var periodInfo = periodInfos[i];
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for (var j = 0; j < periodInfo.streamSetInfos.length; ++j) {
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var streamSetInfo = periodInfo.streamSetInfos[j];
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this.filterStreamSetInfo_(streamSetInfo);
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if (streamSetInfo.streamInfos.length == 0) {
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// Drop any StreamSetInfo that is empty.
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// An error has already been logged.
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periodInfo.streamSetInfos.splice(j, 1);
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--j;
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}
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}
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}
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};
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/**
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* Removes any StreamInfo from the given StreamSetInfo that has
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* an unsupported MIME type.
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*
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* @param {!shaka.media.StreamSetInfo} streamSetInfo
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* @private
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*/
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shaka.media.StreamInfoProcessor.prototype.filterStreamSetInfo_ =
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function(streamSetInfo) {
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// Alias.
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var Player = shaka.player.Player;
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for (var i = 0; i < streamSetInfo.streamInfos.length; ++i) {
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var streamInfo = streamSetInfo.streamInfos[i];
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if (!Player.isTypeSupported(streamInfo.getFullMimeType())) {
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// Drop the stream if its MIME type is not supported by the browser.
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shaka.log.warning('Stream uses an unsupported MIME type.', streamInfo);
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streamSetInfo.streamInfos.splice(i, 1);
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--i;
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}
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}
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};
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/**
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* Sorts StreamInfos by bandwidth.
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*
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* @param {!Array.<!shaka.media.PeriodInfo>} periodInfos
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* @private
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*/
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shaka.media.StreamInfoProcessor.prototype.sortStreamSetInfos_ = function(
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periodInfos) {
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for (var i = 0; i < periodInfos.length; ++i) {
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var periodInfo = periodInfos[i];
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for (var j = 0; j < periodInfo.streamSetInfos.length; ++j) {
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var streamSetInfo = periodInfo.streamSetInfos[j];
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streamSetInfo.streamInfos.sort(
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shaka.media.StreamInfoProcessor.compareByBandwidth_);
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}
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}
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};
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/**
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* Compares two StreamInfos by bandwidth.
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*
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* @param {!shaka.media.StreamInfo} streamInfo1
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* @param {!shaka.media.StreamInfo} streamInfo2
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* @return {number}
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* @private
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*/
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shaka.media.StreamInfoProcessor.compareByBandwidth_ = function(
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streamInfo1, streamInfo2) {
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var b1 = streamInfo1.bandwidth || Number.MAX_VALUE;
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var b2 = streamInfo2.bandwidth || Number.MAX_VALUE;
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if (b1 < b2) {
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return -1;
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} else if (b1 > b2) {
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return 1;
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}
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return 0;
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};
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