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helloVideos.js
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helloVideos.js
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/**
* Cast initialization timer delay
*/
var CAST_API_INITIALIZATION_DELAY = 1000;
/**
* Progress bar update timer delay
*/
var PROGRESS_BAR_UPDATE_DELAY = 1000;
/**
* Session idle time out in miliseconds
*/
var SESSION_IDLE_TIMEOUT = 300000;
/**
* Media source root URL
*/
var MEDIA_SOURCE_ROOT = 'http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/';
// Cast icon thumbnail active
var CAST_ICON_THUMB_ACTIVE = 'images/cast_icon_active.png';
// Cast icon thumbnail idle
var CAST_ICON_THUMB_IDLE = 'images/cast_icon_idle.png';
// Cast icon thumbnail warning
var CAST_ICON_THUMB_WARNING = 'images/cast_icon_warning.png';
/**
* global variables
*/
var currentMediaSession = null;
var currentVolume = 0.5;
var progressFlag = 1;
var mediaCurrentTime = 0;
var session = null;
var storedSession = null;
var mediaURLs = [ 'http://commondatastorage.googleapis.com/gtv-videos-bucket/big_buck_bunny_1080p.mp4', 'http://commondatastorage.googleapis.com/gtv-videos-bucket/ED_1280.mp4', 'http://commondatastorage.googleapis.com/gtv-videos-bucket/tears_of_steel_1080p.mov', 'http://commondatastorage.googleapis.com/gtv-videos-bucket/reel_2012_1280x720.mp4', 'http://commondatastorage.googleapis.com/gtv-videos-bucket/Google%20IO%202011%2045%20Min%20Walk%20Out.mp3' ];
var mediaTitles = [ 'Big Buck Bunny', 'Elephant Dream', 'Tears of Steel', 'Reel 2012', 'Google I/O 2011 Audio' ];
var mediaThumbs = [ 'images/BigBuckBunny.jpg', 'images/ElephantsDream.jpg', 'images/TearsOfSteel.jpg', 'images/reel.jpg', 'images/google-io-2011.jpg' ];
var currentMediaURL = mediaURLs[0];
var currentMediaTitle = mediaTitles[0];
var currentMediaThumb = mediaThumbs[0];
var timer = null;
/**
* Call initialization
*/
if (!chrome.cast || !chrome.cast.isAvailable)
{
setTimeout(initializeCastApi, CAST_API_INITIALIZATION_DELAY);
}
/**
* initialization
*/
function initializeCastApi()
{
// default app ID to the default media receiver app
// optional: you may change it to your own app ID/receiver
var applicationIDs = [ chrome.cast.media.DEFAULT_MEDIA_RECEIVER_APP_ID ];
// auto join policy can be one of the following three
// 1) no auto join
// 2) same appID, same URL, same tab
// 3) same appID and same origin URL
var autoJoinPolicyArray = [ chrome.cast.AutoJoinPolicy.PAGE_SCOPED, chrome.cast.AutoJoinPolicy.TAB_AND_ORIGIN_SCOPED, chrome.cast.AutoJoinPolicy.ORIGIN_SCOPED ];
// request session
var sessionRequest = new chrome.cast.SessionRequest(applicationIDs[0]);
var apiConfig = new chrome.cast.ApiConfig(sessionRequest, sessionListener, receiverListener, autoJoinPolicyArray[1]);
chrome.cast.initialize(apiConfig, onInitSuccess, onError);
}
/**
* initialization success callback
*/
function onInitSuccess()
{
appendMessage('init success');
// check if a session ID is saved into localStorage
storedSession = JSON.parse(localStorage.getItem('storedSession'));
if (storedSession)
{
var dateString = storedSession.timestamp;
var now = new Date().getTime();
if (now - dateString < SESSION_IDLE_TIMEOUT)
{
document.getElementById('joinsessionbyid').style.display = 'block';
}
}
}
/**
* generic error callback
*
* @param {Object} e A chrome.cast.Error object.
*/
function onError(e)
{
console.log('Error' + e);
appendMessage('Error' + e);
}
/**
* generic success callback
*
* @param {string} message from callback
*/
function onSuccess(message)
{
console.log(message);
}
/**
* callback on success for stopping app
*/
function onStopAppSuccess()
{
console.log('Session stopped');
appendMessage('Session stopped');
document.getElementById('casticon').src = CAST_ICON_THUMB_IDLE;
}
/**
* session listener during initialization
*
* @param {Object} e session object
* @this sessionListener
*/
function sessionListener(e)
{
console.log('New session ID: ' + e.sessionId);
appendMessage('New session ID:' + e.sessionId);
session = e;
document.getElementById('casticon').src = CAST_ICON_THUMB_ACTIVE;
if (session.media.length != 0)
{
appendMessage('Found ' + session.media.length + ' existing media sessions.');
onMediaDiscovered('sessionListener', session.media[0]);
}
session.addMediaListener(onMediaDiscovered.bind(this, 'addMediaListener'));
session.addUpdateListener(sessionUpdateListener.bind(this));
// disable join by session id when auto join already
if (storedSession)
{
document.getElementById('joinsessionbyid').style.display = 'none';
}
}
/**
* session update listener
*
* @param {boolean} isAlive status from callback
* @this sessionUpdateListener
*/
function sessionUpdateListener(isAlive)
{
if (!isAlive)
{
session = null;
document.getElementById('casticon').src = CAST_ICON_THUMB_IDLE;
var playpauseresume = document.getElementById('playpauseresume');
playpauseresume.innerHTML = 'Play';
if (timer)
{
clearInterval(timer);
} else
{
timer = setInterval(updateCurrentTime.bind(this), PROGRESS_BAR_UPDATE_DELAY);
playpauseresume.innerHTML = 'Pause';
}
}
}
/**
* receiver listener during initialization
*
* @param {string} e status string from callback
*/
function receiverListener(e)
{
if (e === 'available')
{
console.log('receiver found');
appendMessage('receiver found');
} else
{
console.log('receiver list empty');
appendMessage('receiver list empty');
}
}
/**
* select a media URL
*
* @param {string} m An index for media URL
*/
function selectMedia(m)
{
console.log('media selected' + m);
appendMessage('media selected' + m);
currentMediaURL = mediaURLs[m];
currentMediaTitle = mediaTitles[m];
currentMediaThumb = mediaThumbs[m];
var playpauseresume = document.getElementById('playpauseresume');
document.getElementById('thumb').src = MEDIA_SOURCE_ROOT + mediaThumbs[m];
}
/**
* launch app and request session
*/
function launchApp()
{
console.log('launching app...');
appendMessage('launching app...');
chrome.cast.requestSession(onRequestSessionSuccess, onLaunchError);
if (timer)
{
clearInterval(timer);
}
}
/**
* callback on success for requestSession call
*
* @param {Object} e A non-null new session.
* @this onRequestSesionSuccess
*/
function onRequestSessionSuccess(e)
{
console.log('session success: ' + e.sessionId);
appendMessage('session success: ' + e.sessionId);
saveSessionID(e.sessionId);
session = e;
document.getElementById('casticon').src = CAST_ICON_THUMB_ACTIVE;
session.addUpdateListener(sessionUpdateListener.bind(this));
if (session.media.length != 0)
{
onMediaDiscovered('onRequestSession', session.media[0]);
}
session.addMediaListener(onMediaDiscovered.bind(this, 'addMediaListener'));
}
/**
* callback on launch error
*/
function onLaunchError()
{
console.log('launch error');
appendMessage('launch error');
}
/**
* save session ID into localStorage for sharing
*
* @param {string} sessionId A string for session ID
*/
function saveSessionID(sessionId)
{
// Check browser support of localStorage
if (typeof (Storage) != 'undefined')
{
// Store sessionId and timestamp into an object
var object =
{
id : sessionId,
timestamp : new Date().getTime()
};
localStorage.setItem('storedSession', JSON.stringify(object));
}
}
/**
* join session by a given session ID
*/
function joinSessionBySessionId()
{
if (storedSession)
{
appendMessage('Found stored session id: ' + storedSession.id);
chrome.cast.requestSessionById(storedSession.id);
}
}
/**
* stop app/session
*/
function stopApp()
{
session.stop(onStopAppSuccess, onError);
if (timer)
{
clearInterval(timer);
}
}
/**
* load media specified by custom URL
*/
function loadCustomMedia()
{
var customMediaURL = document.getElementById('customMediaURL').value;
if (customMediaURL.length > 0)
{
loadMedia(customMediaURL);
}
}
/**
* load media
*
* @param {string} mediaURL media URL string
* @this loadMedia
*/
function loadMedia(mediaURL)
{
if (!session)
{
console.log('no session');
appendMessage('no session');
return;
}
if (mediaURL)
{
var mediaInfo = new chrome.cast.media.MediaInfo(mediaURL);
currentMediaTitle = 'custom title needed';
currentMediaThumb = 'images/video_icon.png';
document.getElementById('thumb').src = MEDIA_SOURCE_ROOT + currentMediaThumb;
} else
{
console.log('loading...' + currentMediaURL);
appendMessage('loading...' + currentMediaURL);
var mediaInfo = new chrome.cast.media.MediaInfo(currentMediaURL);
}
mediaInfo.metadata = new chrome.cast.media.GenericMediaMetadata();
mediaInfo.metadata.metadataType = chrome.cast.media.MetadataType.GENERIC;
mediaInfo.contentType = 'video/mp4';
mediaInfo.metadata.title = currentMediaTitle;
mediaInfo.metadata.images = [
{
'url' : MEDIA_SOURCE_ROOT + currentMediaThumb
} ];
var request = new chrome.cast.media.LoadRequest(mediaInfo);
request.autoplay = true;
request.currentTime = 0;
session.loadMedia(request, onMediaDiscovered.bind(this, 'loadMedia'), onMediaError);
}
/**
* callback on success for loading media
*
* @param {string} how info string from callback
* @param {Object} mediaSession media session object
* @this onMediaDiscovered
*/
function onMediaDiscovered(how, mediaSession)
{
console.log('new media session ID:' + mediaSession.mediaSessionId);
appendMessage('new media session ID:' + mediaSession.mediaSessionId + ' (' + how + ')');
currentMediaSession = mediaSession;
currentMediaSession.addUpdateListener(onMediaStatusUpdate);
mediaCurrentTime = currentMediaSession.currentTime;
playpauseresume.innerHTML = 'Play';
document.getElementById('casticon').src = CAST_ICON_THUMB_ACTIVE;
document.getElementById('playerstate').innerHTML = currentMediaSession.playerState;
if (!timer)
{
timer = setInterval(updateCurrentTime.bind(this), PROGRESS_BAR_UPDATE_DELAY);
playpauseresume.innerHTML = 'Pause';
}
}
/**
* callback on media loading error
*
* @param {Object} e A non-null media object
*/
function onMediaError(e)
{
console.log('media error');
appendMessage('media error');
document.getElementById('casticon').src = CAST_ICON_THUMB_WARNING;
}
/**
* get media status initiated by sender when necessary currentMediaSession gets
* updated
*
* @this getMediaStatus
*/
function getMediaStatus()
{
if (!session || !currentMediaSession)
{
return;
}
currentMediaSession.getStatus(null, mediaCommandSuccessCallback.bind(this, 'got media status'), onError);
}
/**
* callback for media status event
*
* @param {boolean} isAlive status from callback
*/
function onMediaStatusUpdate(isAlive)
{
if (!isAlive)
{
currentMediaTime = 0;
} else
{
if (currentMediaSession.playerState == 'PLAYING')
{
if (progressFlag)
{
document.getElementById('progress').value = parseInt(100 * currentMediaSession.currentTime / currentMediaSession.media.duration);
document.getElementById('progress_tick').innerHTML = currentMediaSession.currentTime;
document.getElementById('duration').innerHTML = currentMediaSession.media.duration;
progressFlag = 0;
}
document.getElementById('playpauseresume').innerHTML = 'Pause';
}
}
document.getElementById('playerstate').innerHTML = currentMediaSession.playerState;
}
/**
* Updates the progress bar shown for each media item.
*/
function updateCurrentTime()
{
if (!session || !currentMediaSession)
{
return;
}
if (currentMediaSession.media && currentMediaSession.media.duration != null)
{
var cTime = currentMediaSession.getEstimatedTime();
document.getElementById('progress').value = parseInt(100 * cTime / currentMediaSession.media.duration);
document.getElementById('progress_tick').innerHTML = cTime;
} else
{
document.getElementById('progress').value = 0;
document.getElementById('progress_tick').innerHTML = 0;
if (timer)
{
clearInterval(timer);
}
}
}
/**
* play media
*
* @this playMedia
*/
function playMedia()
{
if (!currentMediaSession)
{
return;
}
if (timer)
{
clearInterval(timer);
}
var playpauseresume = document.getElementById('playpauseresume');
if (playpauseresume.innerHTML == 'Play')
{
currentMediaSession.play(null, mediaCommandSuccessCallback.bind(this, 'playing started for ' + currentMediaSession.sessionId), onError);
playpauseresume.innerHTML = 'Pause';
appendMessage('play started');
timer = setInterval(updateCurrentTime.bind(this), PROGRESS_BAR_UPDATE_DELAY);
} else
{
if (playpauseresume.innerHTML == 'Pause')
{
currentMediaSession.pause(null, mediaCommandSuccessCallback.bind(this, 'paused ' + currentMediaSession.sessionId), onError);
playpauseresume.innerHTML = 'Resume';
appendMessage('paused');
} else
{
if (playpauseresume.innerHTML == 'Resume')
{
currentMediaSession.play(null, mediaCommandSuccessCallback.bind(this, 'resumed ' + currentMediaSession.sessionId), onError);
playpauseresume.innerHTML = 'Pause';
appendMessage('resumed');
timer = setInterval(updateCurrentTime.bind(this), PROGRESS_BAR_UPDATE_DELAY);
}
}
}
}
/**
* stop media
*
* @this stopMedia
*/
function stopMedia()
{
if (!currentMediaSession)
return;
currentMediaSession.stop(null, mediaCommandSuccessCallback.bind(this, 'stopped ' + currentMediaSession.sessionId), onError);
var playpauseresume = document.getElementById('playpauseresume');
playpauseresume.innerHTML = 'Play';
appendMessage('media stopped');
if (timer)
{
clearInterval(timer);
}
}
/**
* set media volume
*
* @param {Number} level A number for volume level
* @param {Boolean} mute A true/false for mute/unmute
* @this setMediaVolume
*/
function setMediaVolume(level, mute)
{
if (!currentMediaSession)
return;
var volume = new chrome.cast.Volume();
volume.level = level;
currentVolume = volume.level;
volume.muted = mute;
var request = new chrome.cast.media.VolumeRequest();
request.volume = volume;
currentMediaSession.setVolume(request, mediaCommandSuccessCallback.bind(this, 'media set-volume done'), onError);
}
/**
* set receiver volume
*
* @param {Number} level A number for volume level
* @param {Boolean} mute A true/false for mute/unmute
* @this setReceiverVolume
*/
function setReceiverVolume(level, mute)
{
if (!session)
return;
if (!mute)
{
session.setReceiverVolumeLevel(level, mediaCommandSuccessCallback.bind(this, 'media set-volume done'), onError);
currentVolume = level;
} else
{
session.setReceiverMuted(true, mediaCommandSuccessCallback.bind(this, 'media set-volume done'), onError);
}
}
/**
* mute media
*/
function muteMedia()
{
if (!session || !currentMediaSession)
{
return;
}
var muteunmute = document.getElementById('muteunmute');
// It's recommended that setReceiverVolumeLevel be used
// but media stream volume can be set instread as shown in the
// setMediaVolume(currentVolume, true);
if (muteunmute.innerHTML == 'Mute media')
{
muteunmute.innerHTML = 'Unmute media';
setReceiverVolume(currentVolume, true);
appendMessage('media muted');
} else
{
muteunmute.innerHTML = 'Mute media';
setReceiverVolume(currentVolume, false);
appendMessage('media unmuted');
}
}
/**
* seek media position
*
* @param {Number} pos A number to indicate percent
* @this seekMedia
*/
function seekMedia(pos)
{
console.log('Seeking ' + currentMediaSession.sessionId + ':' + currentMediaSession.mediaSessionId + ' to ' + pos + '%');
progressFlag = 0;
var request = new chrome.cast.media.SeekRequest();
request.currentTime = pos * currentMediaSession.media.duration / 100;
currentMediaSession.seek(request, onSeekSuccess.bind(this, 'media seek done'), onError);
}
/**
* callback on success for media commands
*
* @param {string} info A message string
*/
function onSeekSuccess(info)
{
console.log(info);
appendMessage(info);
setTimeout(function()
{
progressFlag = 1
}, PROGRESS_BAR_UPDATE_DELAY);
}
/**
* callback on success for media commands
*
* @param {string} info A message string
*/
function mediaCommandSuccessCallback(info)
{
console.log(info);
appendMessage(info);
}
/**
* append message to debug message window
*
* @param {string} message A message string
*/
function appendMessage(message)
{
var dw = document.getElementById('debugmessage');
dw.innerHTML += '\n' + JSON.stringify(message);
}