@l5i/dashjs/build/es5/src/streaming/SourceBufferSink.js

A reference client implementation for the playback of MPEG DASH via Javascript and compliant browsers.

/**
 * The copyright in this software is being made available under the BSD License,
 * included below. This software may be subject to other third party and contributor
 * rights, including patent rights, and no such rights are granted under this license.
 *
 * Copyright (c) 2013, Dash Industry Forum.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *  * Redistributions of source code must retain the above copyright notice, this
 *  list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright notice,
 *  this list of conditions and the following disclaimer in the documentation and/or
 *  other materials provided with the distribution.
 *  * Neither the name of Dash Industry Forum nor the names of its
 *  contributors may be used to endorse or promote products derived from this software
 *  without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS AS IS AND ANY
 *  EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 *  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 *  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 *  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 *  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 *  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 *  POSSIBILITY OF SUCH DAMAGE.
 */'use strict';Object.defineProperty(exports,'__esModule',{value:true});function _interopRequireDefault(obj){return obj && obj.__esModule?obj:{'default':obj};}var _coreDebug=require('../core/Debug');var _coreDebug2=_interopRequireDefault(_coreDebug);var _voDashJSError=require('./vo/DashJSError');var _voDashJSError2=_interopRequireDefault(_voDashJSError);var _coreEventBus=require('../core/EventBus');var _coreEventBus2=_interopRequireDefault(_coreEventBus);var _coreEventsEvents=require('../core/events/Events');var _coreEventsEvents2=_interopRequireDefault(_coreEventsEvents);var _coreFactoryMaker=require('../core/FactoryMaker');var _coreFactoryMaker2=_interopRequireDefault(_coreFactoryMaker);var _textTextController=require('./text/TextController');var _textTextController2=_interopRequireDefault(_textTextController);var _coreErrorsErrors=require('../core/errors/Errors');var _coreErrorsErrors2=_interopRequireDefault(_coreErrorsErrors); /**
 * @class SourceBufferSink
 * @implements FragmentSink
 */function SourceBufferSink(mediaSource,mediaInfo,onAppendedCallback,oldBuffer){var context=this.context;var eventBus=(0,_coreEventBus2['default'])(context).getInstance();var instance=undefined,logger=undefined,buffer=undefined,isAppendingInProgress=undefined;var callbacks=[];var appendQueue=[];var onAppended=onAppendedCallback;var intervalId=undefined;function setup(){logger = (0,_coreDebug2['default'])(context).getInstance().getLogger(instance);isAppendingInProgress = false;var codec=mediaInfo.codec;try{ // Safari claims to support anything starting 'application/mp4'.
// it definitely doesn't understand 'application/mp4;codecs="stpp"'
// - currently no browser does, so check for it and use our own
// implementation. The same is true for codecs="wvtt".
if(codec.match(/application\/mp4;\s*codecs="(stpp|wvtt).*"/i)){throw new Error('not really supported');}buffer = oldBuffer?oldBuffer:mediaSource.addSourceBuffer(codec);var CHECK_INTERVAL=50; // use updateend event if possible
if(typeof buffer.addEventListener === 'function'){try{buffer.addEventListener('updateend',updateEndHandler,false);buffer.addEventListener('error',errHandler,false);buffer.addEventListener('abort',errHandler,false);}catch(err) { // use setInterval to periodically check if updating has been completed
intervalId = setInterval(checkIsUpdateEnded,CHECK_INTERVAL);}}else { // use setInterval to periodically check if updating has been completed
intervalId = setInterval(checkIsUpdateEnded,CHECK_INTERVAL);}}catch(ex) { // Note that in the following, the quotes are open to allow for extra text after stpp and wvtt
if(mediaInfo.isText || codec.indexOf('codecs="stpp') !== -1 || codec.indexOf('codecs="wvtt') !== -1){var textController=(0,_textTextController2['default'])(context).getInstance();buffer = textController.getTextSourceBuffer();}else {throw ex;}}}function reset(keepBuffer){if(buffer){if(typeof buffer.removeEventListener === 'function'){buffer.removeEventListener('updateend',updateEndHandler,false);buffer.removeEventListener('error',errHandler,false);buffer.removeEventListener('abort',errHandler,false);}clearInterval(intervalId);if(!keepBuffer){try{if(!buffer.getClassName || buffer.getClassName() !== 'TextSourceBuffer'){mediaSource.removeSourceBuffer(buffer);}}catch(e) {logger.error('Failed to remove source buffer from media source.');}buffer = null;}isAppendingInProgress = false;}appendQueue = [];onAppended = null;}function getBuffer(){return buffer;}function getAllBufferRanges(){try{return buffer.buffered;}catch(e) {logger.error('getAllBufferRanges exception: ' + e.message);return null;}}function append(chunk){if(!chunk){onAppended({chunk:chunk,error:new _voDashJSError2['default'](_coreErrorsErrors2['default'].APPEND_ERROR_CODE,_coreErrorsErrors2['default'].APPEND_ERROR_MESSAGE)});return;}appendQueue.push(chunk);if(!isAppendingInProgress){waitForUpdateEnd(buffer,appendNextInQueue.bind(this));}}function updateTimestampOffset(MSETimeOffset){if(buffer.timestampOffset !== MSETimeOffset && !isNaN(MSETimeOffset)){waitForUpdateEnd(buffer,function(){buffer.timestampOffset = MSETimeOffset;});}}function remove(start,end,forceRemoval){var sourceBufferSink=this; // make sure that the given time range is correct. Otherwise we will get InvalidAccessError
waitForUpdateEnd(buffer,function(){try{if(start >= 0 && end > start && (forceRemoval || mediaSource.readyState !== 'ended')){buffer.remove(start,end);} // updating is in progress, we should wait for it to complete before signaling that this operation is done
waitForUpdateEnd(buffer,function(){eventBus.trigger(_coreEventsEvents2['default'].SOURCEBUFFER_REMOVE_COMPLETED,{buffer:sourceBufferSink,from:start,to:end,unintended:false});});}catch(err) {eventBus.trigger(_coreEventsEvents2['default'].SOURCEBUFFER_REMOVE_COMPLETED,{buffer:sourceBufferSink,from:start,to:end,unintended:false,error:new _voDashJSError2['default'](err.code,err.message)});}});}function appendNextInQueue(){var _this=this;var sourceBufferSink=this;if(appendQueue.length > 0){(function(){isAppendingInProgress = true;var nextChunk=appendQueue[0];appendQueue.splice(0,1);var oldRanges=[];var afterSuccess=function afterSuccess(){ // Safari sometimes drops a portion of a buffer after appending. Handle these situations here
var newRanges=getAllBufferRanges();checkBufferGapsAfterAppend(sourceBufferSink,oldRanges,newRanges,nextChunk);if(appendQueue.length > 0){appendNextInQueue.call(this);}else {isAppendingInProgress = false;if(onAppended){onAppended({chunk:nextChunk});}}};try{if(nextChunk.bytes.length === 0){afterSuccess.call(_this);}else {oldRanges = getAllBufferRanges();if(buffer.appendBuffer){buffer.appendBuffer(nextChunk.bytes);}else {buffer.append(nextChunk.bytes,nextChunk);} // updating is in progress, we should wait for it to complete before signaling that this operation is done
waitForUpdateEnd(buffer,afterSuccess.bind(_this));}}catch(err) {logger.fatal('SourceBuffer append failed "' + err + '"');if(appendQueue.length > 0){appendNextInQueue();}else {isAppendingInProgress = false;}if(onAppended){onAppended({chunk:nextChunk,error:new _voDashJSError2['default'](err.code,err.message)});}}})();}}function checkBufferGapsAfterAppend(buffer,oldRanges,newRanges,chunk){if(oldRanges && oldRanges.length > 0 && oldRanges.length < newRanges.length && isChunkAlignedWithRange(oldRanges,chunk)){ // A split in the range was created while appending
eventBus.trigger(_coreEventsEvents2['default'].SOURCEBUFFER_REMOVE_COMPLETED,{buffer:buffer,from:newRanges.end(newRanges.length - 2),to:newRanges.start(newRanges.length - 1),unintended:true});}}function isChunkAlignedWithRange(oldRanges,chunk){for(var i=0;i < oldRanges.length;i++) {var start=Math.round(oldRanges.start(i));var end=Math.round(oldRanges.end(i));if(end === chunk.start || start === chunk.end || chunk.start >= start && chunk.end <= end){return true;}}return false;}function abort(){try{if(mediaSource.readyState === 'open'){buffer.abort();}else if(buffer.setTextTrack && mediaSource.readyState === 'ended'){buffer.abort(); //The cues need to be removed from the TextSourceBuffer via a call to abort()
}}catch(ex) {logger.error('SourceBuffer append abort failed: "' + ex + '"');}appendQueue = [];}function executeCallback(){if(callbacks.length > 0){var cb=callbacks.shift();if(buffer.updating){waitForUpdateEnd(buffer,cb);}else {cb(); // Try to execute next callback if still not updating
executeCallback();}}}function checkIsUpdateEnded(){ // if updating is still in progress do nothing and wait for the next check again.
if(buffer.updating)return; // updating is completed, now we can stop checking and resolve the promise
executeCallback();}function updateEndHandler(){if(buffer.updating)return;executeCallback();}function errHandler(){logger.error('SourceBufferSink error',mediaInfo.type);}function waitForUpdateEnd(buffer,callback){callbacks.push(callback);if(!buffer.updating){executeCallback();}}instance = {getAllBufferRanges:getAllBufferRanges,getBuffer:getBuffer,append:append,remove:remove,abort:abort,reset:reset,updateTimestampOffset:updateTimestampOffset};setup();return instance;}SourceBufferSink.__dashjs_factory_name = 'SourceBufferSink';var factory=_coreFactoryMaker2['default'].getClassFactory(SourceBufferSink);exports['default'] = factory;module.exports = exports['default'];
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