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      1 // Copyright (c) 2013 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 (function() {
      6   var videoElement = document.querySelector('#movie_player video');
      7   var videoEvents = {
      8     timeupdate: []
      9   };
     10 
     11   if (videoElement instanceof HTMLMediaElement) {
     12     function logEventHappened(e) {
     13       videoEvents[e.type + '_completed'] = true;
     14     }
     15 
     16     function logTimeUpdate(e) {
     17       videoEvents.timeupdate.push(getCurrentTime());
     18     }
     19 
     20     function onError(e) {
     21       console.error('Error playing video: ' + e.type);
     22     }
     23 
     24     videoElement.addEventListener('playing', logEventHappened);
     25     videoElement.addEventListener('seeking', logEventHappened);
     26     videoElement.addEventListener('seeked', logEventHappened);
     27     videoElement.addEventListener('ended', logEventHappened);
     28     videoElement.addEventListener('timeupdate', logTimeUpdate);
     29     videoElement.addEventListener('error', onError);
     30     videoElement.addEventListener('abort', onError);
     31   }
     32   else {
     33     console.error('Can not play non HTML5 video element.');
     34   }
     35 
     36   function playVideo() {
     37     videoElement.play();
     38   }
     39 
     40   function pauseVideo() {
     41     videoElement.pause();
     42   }
     43 
     44   function seek(time) {
     45     videoElement.currentTime = time;
     46   }
     47 
     48   function seekToAlmostEnd(seconds_before_end) {
     49     videoElement.currentTime = getDuration() - seconds_before_end;
     50   }
     51 
     52   function setPlaybackQuality(quality) {
     53     videoElement.setPlaybackQuality(quality);
     54   }
     55 
     56   function getVideoState() {
     57     if (videoElement.ended) {
     58       return 'ended';
     59     }
     60     else if (videoElement.paused) {
     61       return 'paused';
     62     }
     63     else if (videoElement.seeking) {
     64       return 'seeking';
     65     }
     66     else {
     67       return 'playing';
     68     }
     69   }
     70 
     71   function getDuration() {
     72     return videoElement.duration;
     73   }
     74 
     75   function getCurrentTime() {
     76     return videoElement.currentTime;
     77   }
     78 
     79   function getEventHappened(e) {
     80     // Pass in the base event name and it will get automatically converted.
     81     return videoEvents[e + '_completed'] === true;
     82   }
     83 
     84   function clearEventHappened(e) {
     85     delete videoEvents[e + '_completed'];
     86   }
     87 
     88   function getLastSecondTimeupdates(e) {
     89     var updatesInLastSecond = 0;
     90     var duration = getDuration();
     91 
     92     for (var index in videoEvents.timeupdate) {
     93       var update_time = videoEvents.timeupdate[index];
     94       if (update_time > duration - 1 && update_time < duration) {
     95         updatesInLastSecond += 1;
     96       }
     97     }
     98     return updatesInLastSecond;
     99   }
    100 
    101   function getPlaybackQuality() {
    102     return videoElement.getPlaybackQuality();
    103   }
    104 
    105   window.__videoElement = videoElement;
    106   window.__playVideo = playVideo;
    107   window.__pauseVideo = pauseVideo;
    108   window.__seek = seek;
    109   window.__seekToAlmostEnd = seekToAlmostEnd;
    110   window.__getVideoState = getVideoState;
    111   window.__getDuration = getDuration;
    112   window.__getCurrentTime = getCurrentTime;
    113   window.__getEventHappened = getEventHappened;
    114   window.__clearEventHappened = clearEventHappened;
    115   window.__getLastSecondTimeupdates = getLastSecondTimeupdates;
    116 
    117   return window.__videoElement !== null;
    118 })();
    119