media/test/data/eme_player_js/media_source_utils.js

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // MediaSourceUtils provides basic functionality to load content using MSE API.
   6 var MediaSourceUtils = new function() {
   7 }
   8
   9 MediaSourceUtils.loadMediaSourceFromTestConfig = function(testConfig,
  10                                                           appendCallbackFn) {
  11   return this.loadMediaSource(testConfig.mediaFile,
  12                               testConfig.mediaType,
  13                               appendCallbackFn);
  14 };
  15
  16 MediaSourceUtils.loadMediaSource = function(mediaFiles,
  17                                             mediaTypes,
  18                                             appendCallbackFn) {
  19   if (!mediaFiles || !mediaTypes)
  20     Utils.failTest('Missing parameters in loadMediaSource().');
  21
  22   var mediaFiles = Utils.convertToArray(mediaFiles);
  23   var mediaTypes = Utils.convertToArray(mediaTypes);
  24   var totalAppended = 0;
  25   function onSourceOpen(e) {
  26     Utils.timeLog('onSourceOpen', e);
  27     // We can load multiple media files using the same media type. However, if
  28     // more than one media type is used, we expect to have a media type entry
  29     // for each corresponding media file.
  30     var srcBuffer = null;
  31     for (var i = 0; i < mediaFiles.length; i++) {
  32       if (i == 0 || mediaFiles.length == mediaTypes.length) {
  33         Utils.timeLog('Creating a source buffer for type ' + mediaTypes[i]);
  34         try {
  35           srcBuffer = mediaSource.addSourceBuffer(mediaTypes[i]);
  36         } catch (e) {
  37           Utils.failTest('Exception adding source buffer: ' + e.message);
  38           return;
  39         }
  40       }
  41       doAppend(mediaFiles[i], srcBuffer);
  42     }
  43   }
  44
  45   function doAppend(mediaFile, srcBuffer) {
  46     var xhr = new XMLHttpRequest();
  47     xhr.open('GET', mediaFile);
  48     xhr.responseType = 'arraybuffer';
  49     xhr.addEventListener('load', function(e) {
  50       var onUpdateEnd = function(e) {
  51         Utils.timeLog('End of appending buffer from ' + mediaFile);
  52         srcBuffer.removeEventListener('updateend', onUpdateEnd);
  53         totalAppended++;
  54         if (totalAppended == mediaFiles.length) {
  55           if (appendCallbackFn)
  56             appendCallbackFn(mediaSource);
  57           else
  58             mediaSource.endOfStream();
  59         }
  60       };
  61       srcBuffer.addEventListener('updateend', onUpdateEnd);
  62       srcBuffer.appendBuffer(new Uint8Array(e.target.response));
  63     });
  64     xhr.send();
  65   }
  66
  67   var mediaSource = new MediaSource();
  68   mediaSource.addEventListener('sourceopen', onSourceOpen);
  69   return mediaSource;
  70 };