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sample_media_receiver.html
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<!--
Copyright (C) 2013 Google Inc. All Rights Reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<!DOCTYPE html>
<html>
<head>
<title>Sample Media Receiver</title>
<!--
Cast APIs
-->
<script type="text/javascript" src="//www.gstatic.com/cast/sdk/libs/receiver/2.0.0/cast_receiver.js"></script>
<!--
Cast Media Library
-->
<script type="text/javascript" src="//www.gstatic.com/cast/sdk/libs/mediaplayer/0.3.0/media_player.js"></script>
<style>
body {
overflow:hidden;
}
video {
height:720PX;
width:1280PX;
text-align: center;
border:0px solid silver;
display: table-cell;
vertical-align: middle;
color: #FFFFFF;
background-color: #000000;
font-weight: bold;
font-family: Verdana, Geneva, sans-serif;
font-size:40px;
float:left;
z-index: 1;
position:absolute;
}
#messages {
color: #FFFFFF;
float: left;
margin-left: 25px;
margin-top: 25px;
z-index: 2;
position:absolute;
font-weight: bold;
width:1000PX;
background-color: rgba(0,0,0,0.5);
}
#messages span {
font-weight: normal;
}
</style>
</head>
<body>
<div id="messages">
<div id="title">Sample Media Receiver HUD</div>
<div>Application State: <span id="applicationState">-</span></div>
<div>Session Count: <span id="sessionCount">0</span></div>
<div>Media Element State: <span id="mediaElementState">-</span></div>
<div>Cast Receiver Manager Message: <span id="castReceiverManagerMessage">-</span></div>
<div>Media Manager Message: <span id="mediaManagerMessage">-</span></div>
<div>Message Bus Message: <span id="messageBusMessage">-</span></div>
<div>Volume: <span id="volumeMessage">Unknown</span></div>
<div>Host State: <span id="mediaHostState">Unknown</span></div>
<div>Media Type: <span id="mediaType">Unkown</span></div>
<div>Media Protocol: <span id="mediaProtocol">Unknown</span></div>
</div>
<video id="receiverVideoElement"></video>
<script type="text/javascript">
"use strict";
window.castReceiverManager = null;
window.mediaManager = null;
window.messageBus = null;
window.mediaElement = null;
window.mediaHost = null;
window.mediaProtocol = null;
window.mediaPlayer = null;
window.connectedCastSenders = []; // {senderId:'', channel:obj}
function setHudMessage(elementId, message) {
document.getElementById(elementId).innerHTML = '' + JSON.stringify(message);
}
window.onload = function() {
window.mediaElement = document.getElementById('receiverVideoElement');
window.mediaElement.autoplay = true;
/**
play – The process of play has started
waiting – When the video stops due to buffering
volumechange – volume has changed
stalled – trying to get data, but not available
ratechange – some speed changed
canplay – It is possible to start playback, but no guarantee of not buffering
canplaythrough – It seems likely that we can play w/o buffering issues
ended – the video has finished
error – error occured during loading of the video
playing – when the video has started playing
seeking – started seeking
seeked – seeking has completed
http://www.w3.org/2010/05/video/mediaevents.html for more info.
**/
window.mediaElement.addEventListener('loadstart', function(e){
console.log("######### MEDIA ELEMENT LOAD START");
setHudMessage('mediaElementState','Load Start');
});
window.mediaElement.addEventListener('loadeddata', function(e){
console.log("######### MEDIA ELEMENT DATA LOADED");
setHudMessage('mediaElementState','Data Loaded');
});
window.mediaElement.addEventListener('canplay', function(e){
console.log("######### MEDIA ELEMENT CAN PLAY");
setHudMessage('mediaElementState','Can Play');
});
window.mediaElement.addEventListener('ended', function(e){
console.log("######### MEDIA ELEMENT ENDED");
setHudMessage('mediaElementState','Ended');
});
window.mediaElement.addEventListener('playing', function(e){
console.log("######### MEDIA ELEMENT PLAYING");
setHudMessage('mediaElementState','Playing');
});
window.mediaElement.addEventListener('waiting', function(e){
console.log("######### MEDIA ELEMENT WAITING");
setHudMessage('mediaElementState','Waiting');
});
window.mediaElement.addEventListener('stalled', function(e){
console.log("######### MEDIA ELEMENT STALLED");
setHudMessage('mediaElementState','Stalled');
});
window.mediaElement.addEventListener('error', function(e){
console.log("######### MEDIA ELEMENT ERROR " + e);
setHudMessage('mediaElementState','Error');
});
window.mediaElement.addEventListener('abort', function(e){
console.log("######### MEDIA ELEMENT ABORT " + e);
setHudMessage('mediaElementState','Abort');
});
window.mediaElement.addEventListener('susppend', function(e){
console.log("######### MEDIA ELEMENT SUSPEND " + e);
setHudMessage('mediaElementState','Suspended');
});
window.mediaElement.addEventListener('progress', function(e){
setHudMessage('mediaElementState','Progress');
});
window.mediaElement.addEventListener('seeking', function(e){
console.log("######### MEDIA ELEMENT SEEKING " + e);
setHudMessage('mediaElementState','Seeking');
});
window.mediaElement.addEventListener('seeked', function(e){
console.log("######### MEDIA ELEMENT SEEKED " + e);
setHudMessage('mediaElementState','Seeked');
});
/**
* Sets the log verbosity level.
*
* Debug logging (all messages).
* DEBUG
*
* Verbose logging (sender messages).
* VERBOSE
*
* Info logging (events, general logs).
* INFO
*
* Error logging (errors).
* ERROR
*
* No logging.
* NONE
**/
cast.receiver.logger.setLevelValue(cast.receiver.LoggerLevel.DEBUG);
window.castReceiverManager = cast.receiver.CastReceiverManager.getInstance();
/**
* Called to process 'ready' event. Only called after calling castReceiverManager.start(config) and the
* system becomes ready to start receiving messages.
*
* @param {cast.receiver.CastReceiverManager.Event} event - can be null
*
* There is no default handler
*/
window.castReceiverManager.onReady = function(event) {
console.log("### Cast Receiver Manager is READY: " + JSON.stringify(event));
setHudMessage('castReceiverManagerMessage', 'READY: ' + JSON.stringify(event));
setHudMessage('applicationState','Loaded. Started. Ready.');
}
/**
* If provided, it processes the 'senderconnected' event.
* Called to process the 'senderconnected' event.
* @param {cast.receiver.CastReceiverManager.Event} event - can be null
*
* There is no default handler
*/
window.castReceiverManager.onSenderConnected = function(event) {
console.log("### Cast Receiver Manager - Sender Connected : " + JSON.stringify(event));
setHudMessage('castReceiverManagerMessage', 'Sender Connected: ' + JSON.stringify(event));
// TODO - add sender and grab CastChannel from CastMessageBus.getCastChannel(senderId)
var senders = window.castReceiverManager.getSenders();
setHudMessage('sessionCount', '' + senders.length);
}
/**
* If provided, it processes the 'senderdisconnected' event.
* Called to process the 'senderdisconnected' event.
* @param {cast.receiver.CastReceiverManager.Event} event - can be null
*
* There is no default handler
*/
window.castReceiverManager.onSenderDisconnected = function(event) {
console.log("### Cast Receiver Manager - Sender Disconnected : " + JSON.stringify(event));
setHudMessage('castReceiverManagerMessage', 'Sender Disconnected: ' + JSON.stringify(event));
var senders = window.castReceiverManager.getSenders();
setHudMessage('sessionCount', '' + senders.length);
}
/**
* If provided, it processes the 'systemvolumechanged' event.
* Called to process the 'systemvolumechanged' event.
* @param {cast.receiver.CastReceiverManager.Event} event - can be null
*
* There is no default handler
*/
window.castReceiverManager.onSystemVolumeChanged = function(event) {
console.log("### Cast Receiver Manager - System Volume Changed : " + JSON.stringify(event));
setHudMessage('castReceiverManagerMessage', 'System Volume Changed: ' + JSON.stringify(event));
// See cast.receiver.media.Volume
console.log("### Volume: " + event.data['level'] + " is muted? " + event.data['muted']);
setHudMessage('volumeMessage', 'Level: ' + event.data['level'] + ' -- muted? ' + event.data['muted']);
}
/**
* Called to process the 'visibilitychanged' event.
*
* Fired when the visibility of the application has changed (for example
* after a HDMI Input change or when the TV is turned off/on and the cast
* device is externally powered). Note that this API has the same effect as
* the webkitvisibilitychange event raised by your document, we provided it
* as CastReceiverManager API for convenience and to avoid a dependency on a
* webkit-prefixed event.
*
* @param {cast.receiver.CastReceiverManager.Event} event - can be null
*
* There is no default handler for this event type.
*/
window.castReceiverManager.onVisibilityChanged = function(event) {
console.log("### Cast Receiver Manager - Visibility Changed : " + JSON.stringify(event));
setHudMessage('castReceiverManagerMessage', 'Visibility Changed: ' + JSON.stringify(event));
/** check if visible and pause media if not - add a timer to tear down after a period of time
if visibilty does not change back **/
if (event.data) { // It is visible
window.mediaElement.play(); // Resume media playback
window.clearTimeout(window.timeout); // Turn off the timeout
window.timeout = null;
} else {
window.mediaElement.pause(); // Pause playback
window.timeout = window.setTimeout(function(){window.close();}, 10000); // 10 Minute timeout
}
}
/**
* ALTERNATIVE TO onVisibilityChanged
*
* Use this to know when the user switched away from the Cast device input. It depends on the TV
* Supporting CEC
**/
document.addEventListener('webkitvisibilitychange', function(){
if(document.webkithidden) {
window.mediaElement.pause(); // Pause playback
window.timeout = window.setTimeout(function(){window.close();}, 10000); // 10 Minute timeout
} else {
window.mediaElement.play(); // Resume media playback
window.clearTimeout(window.timeout); // Turn off the timeout
window.timeout = null;
}
});
/**
* Use the messageBus to listen for incoming messages on a virtual channel using a namespace string.
* Also use messageBus to send messages back to a sender or broadcast a message to all senders.
* You can check the cast.receiver.CastMessageBus.MessageType that a message bus processes though a call
* to getMessageType. As well, you get the namespace of a message bus by calling getNamespace()
*/
window.messageBus = window.castReceiverManager.getCastMessageBus('urn:x-cast:com.google.devrel.custom');
/**
* The namespace urn:x-cast:com.google.devrel.custom is used to identify the protocol of showing/hiding
* the heads up display messages (The messages defined at the beginning of the html).
*
* The protocol consists of one string message: show
* In the case of the message value not being show - the assumed value is hide.
**/
window.messageBus.onMessage = function(event) {
console.log("### Message Bus - Media Message: " + JSON.stringify(event));
setHudMessage('messageBusMessage', event);
console.log("### CUSTOM MESSAGE: " + JSON.stringify(event));
// show/hide messages
console.log(event['data']);
if(event['data']==='show') {
document.getElementById('messages').style.display = 'block';
} else {
document.getElementById('messages').style.display = 'none';
}
}
// This class is used to send/receive media messages/events using the media protocol/namesapce (urn:x-cast:com.google.cast.media).
window.mediaManager = new cast.receiver.MediaManager(window.mediaElement);
/**
* Called when the media ends.
*
* mediaManager.resetMediaElement(cast.receiver.media.IdleReason.FINISHED);
**/
window.mediaManager['onEndedOrig'] = window.mediaManager.onEnded;
/**
* Called when the media ends
*/
window.mediaManager.onEnded = function() {
console.log("### Media Manager - ENDED: " + JSON.stringify(event));
setHudMessage('mediaManagerMessage', 'ENDED');
window.mediaManager['onEndedOrig']();
}
/**
* Default implementation of onError.
*
* mediaManager.resetMediaElement(cast.receiver.media.IdleReason.ERROR)
**/
window.mediaManager['onErrorOrig'] = window.mediaManager.onError;
/**
* Called when there is an error not triggered by a LOAD request
* @param obj
*/
window.mediaManager.onError = function(obj) {
console.log("### Media Manager - error: " + JSON.stringify(obj));
setHudMessage('mediaManagerMessage', 'ERROR - ' + JSON.stringify(obj));
window.mediaManager['onErrorOrig'](obj);
}
/**
* Processes the get status event.
*
* Sends a media status message to the requesting sender (event.data.requestId)
**/
window.mediaManager['onGetStatusOrig'] = window.mediaManager.onGetStatus;
/**
* Processes the get status event.
* @param event
*/
window.mediaManager.onGetStatus = function(event) {
console.log("### Media Manager - GET STATUS: " + JSON.stringify(event));
setHudMessage('mediaManagerMessage', 'GET STATUS ' + JSON.stringify(event));
window.mediaManager['onGetStatusOrig'](event);
}
/**
* Default implementation of onLoadMetadataError.
*
* mediaManager.resetMediaElement(cast.receiver.media.IdleReason.ERROR, false);
* mediaManager.sendLoadError(cast.receiver.media.ErrorType.LOAD_FAILED);
**/
window.mediaManager['onLoadMetadataErrorOrig'] = window.mediaManager.onLoadMetadataError;
/**
* Called when load has had an error, overridden to handle application specific logic.
* @param event
*/
window.mediaManager.onLoadMetadataError = function(event) {
console.log("### Media Manager - LOAD METADATA ERROR: " + JSON.stringify(event));
setHudMessage('mediaManagerMessage', 'LOAD METADATA ERROR: ' + JSON.stringify(event));
window.mediaManager['onLoadMetadataErrorOrig'](event);
}
/**
* Default implementation of onMetadataLoaded
*
* Passed a cast.receiver.MediaManager.LoadInfo event object
* Sets the mediaElement.currentTime = loadInfo.message.currentTime
* Sends the new status after a LOAD message has been completed succesfully.
* Note: Applications do not normally need to call this API.
* When the application overrides onLoad, it may need to manually declare that
* the LOAD request was sucessful. The default implementaion will send the new
* status to the sender when the video/audio element raises the
* 'loadedmetadata' event.
* The default behavior may not be acceptable in a couple scenarios:
*
* 1) When the application does not want to declare LOAD succesful until for
* example 'canPlay' is raised (instead of 'loadedmetadata').
* 2) When the application is not actually loading the media element (for
* example if LOAD is used to load an image).
**/
window.mediaManager['onLoadMetadataOrig'] = window.mediaManager.onLoadMetadataLoaded;
/**
* Called when load has completed, overridden to handle application specific logic.
* @param event
*/
window.mediaManager.onLoadMetadataLoaded = function(event) {
console.log("### Media Manager - LOADED METADATA: " + JSON.stringify(event));
setHudMessage('mediaManagerMessage', 'LOADED METADATA: ' + JSON.stringify(event));
window.mediaManager['onLoadMetadataOrig'](event);
}
/**
* Processes the pause event.
*
* mediaElement.pause();
* Broadcast (without sending media information) to all senders that pause has happened.
**/
window.mediaManager['onPauseOrig'] = window.mediaManager.onPause;
/**
* Process pause event
* @param event
*/
window.mediaManager.onPause = function(event) {
console.log("### Media Manager - PAUSE: " + JSON.stringify(event));
setHudMessage('mediaManagerMessage', 'PAUSE: ' + JSON.stringify(event));
window.mediaManager['onPauseOrig'](event);
}
/**
* Default - Processes the play event.
*
* mediaElement.play();
*
**/
window.mediaManager['onPlayOrig'] = window.mediaManager.onPlay;
/**
* Process play event
* @param event
*/
window.mediaManager.onPlay = function(event) {
console.log("### Media Manager - PLAY: " + JSON.stringify(event));
setHudMessage('mediaManagerMessage', 'PLAY: ' + JSON.stringify(event));
window.mediaManager['onPlayOrig'](event);
}
/**
* Default implementation of the seek event.
* Sets the mediaElement.currentTime to event.data.currentTime.
* If the event.data.resumeState is cast.receiver.media.SeekResumeState.PLAYBACK_START and the mediaElement is paused then
* call mediaElement.play(). Otherwise if event.data.resumeState is cast.receiver.media.SeekResumeState.PLAYBACK_PAUSE and
* the mediaElement is not paused, call mediaElement.pause().
* Broadcast (without sending media information) to all senders that seek has happened.
**/
window.mediaManager['onSeekOrig'] = window.mediaManager.onSeek;
/**
* Process seek event
* @param event
*/
window.mediaManager.onSeek = function(event) {
console.log("### Media Manager - SEEK: " + JSON.stringify(event));
setHudMessage('mediaManagerMessage', 'SEEK: ' + JSON.stringify(event));
window.mediaManager['onSeekOrig'](event);
}
/**
* Default implementation of the set volume event.
* Checks event.data.volume.level is defined and sets the mediaElement.volume to the value
* Checks event.data.volume.muted is defined and sets the mediaElement.muted to the value
* Broadcasts (without sending media information) to all senders that the volume has changed.
**/
window.mediaManager['onSetVolumeOrig'] = window.mediaManager.onSetVolume;
/**
* Process set volume event
* @param event
*/
window.mediaManager.onSetVolume = function(event) {
console.log("### Media Manager - SET VOLUME: " + JSON.stringify(event));
setHudMessage('mediaManagerMessage', 'SET VOLUME: ' + JSON.stringify(event));
window.mediaManager['onSetVolumeOrig'](event);
}
/**
* Processes the stop event.
*
* window.mediaManager.resetMediaElement(cast.receiver.media.IdleReason.CANCELLED, true, event.data.requestId);
*
* Resets Media Element to IDLE state. After this call the mediaElement
* properties will change, paused will be true, currentTime will be zero and
* the src attribute will be empty. This only needs to be manually called if the
* developer wants to override the default behavior of onError, onStop or
* onEnded, for example.
**/
window.mediaManager['onStopOrig'] = window.mediaManager.onStop;
/**
* Process stop event
* @param event
*/
window.mediaManager.onStop = function(event) {
console.log("### Media Manager - STOP: " + JSON.stringify(event));
setHudMessage('mediaManagerMessage', 'STOP: ' + JSON.stringify(event));
window.mediaManager['onStopOrig'](event);
}
/**
* Default implementation for the load event.
*
* Sets the mediaElement.autoplay to false.
* Checks that data.media and data.media.contentId are valid then sets the mediaElement.src to the
* data.media.contentId.
*
* Checks the data.autoplay value:
* - if undefined sets mediaElement.autoplay = true
* - if has value then sets mediaElement.autoplay to that value
**/
window.mediaManager['onLoadOrig'] = window.mediaManager.onLoad;
/**
* Processes the load event.
* @param event
*/
window.mediaManager.onLoad = function(event) {
console.log("### Media Manager - LOAD: " + JSON.stringify(event));
setHudMessage('mediaManagerMessage', 'LOAD ' + JSON.stringify(event));
// TODO - setup for load here
// TODO - if there is an error during load: call mediaManager.sendLoadError to notify sender
// TODO - if there is no error call mediaManager.sendLoadCompleteComplete
// TODO - call mediaManager.setMediaInformation(MediaInformation)
if(window.mediaPlayer !== null) {
window.mediaPlayer.unload(); // Ensure unload before loading again
}
if (event.data['media'] && event.data['media']['contentId']) {
var url = event.data['media']['contentId'];
window.mediaHost = new cast.player.api.Host({
'mediaElement': window.mediaElement,
'url': url
});
window.mediaHost.onError = function (errorCode) {
console.error('### HOST ERROR - Fatal Error: code = ' + errorCode);
setHudMessage('mediaHostState', 'Fatal Error: code = ' + errorCode);
if (window.mediaPlayer !== null) {
window.mediaPlayer.unload();
}
}
var initialTimeIndexSeconds = event.data['media']['currentTime'] || 0;
// TODO: real code would know what content it was going to access and this crap would not be here.
var protocol = null;
var ext = ext = url.split('.').pop();
if (ext === 'm3u8') {
protocol = cast.player.api.CreateHlsStreamingProtocol(window.mediaHost);
} else if (ext === 'mpd') {
protocol = cast.player.api.CreateDashStreamingProtocol(window.mediaHost);
} else if (ext === 'ism/') {
protocol = cast.player.api.CreateSmoothStreamingProtocol(window.mediaHost);
}
console.log('### Media Protocol Identified as ' + ext);
setHudMessage('mediaProtocol', ext);
if (protocol === null) {
// Call on original handler
window.mediaManager['onLoadOrig'](event); // Call on the original callback
} else {
// Advanced Playback - HLS, MPEG DASH, SMOOTH STREAMING
// Player registers to listen to the media element events through the mediaHost property of the
// mediaElement
window.mediaPlayer = new cast.player.api.Player(window.mediaHost);
window.mediaPlayer.load(protocol, initialTimeIndexSeconds);
}
}
}
console.log('### Application Loaded. Starting system.');
setHudMessage('applicationState','Loaded. Starting up.');
/**
* Application config
**/
var appConfig = new cast.receiver.CastReceiverManager.Config();
/**
* Text that represents the application status. It should meet
* internationalization rules as may be displayed by the sender application.
* @type {string|undefined}
**/
appConfig.statusText = 'Ready to play';
/**
* Maximum time in seconds before closing an idle
* sender connection. Setting this value enables a heartbeat message to keep
* the connection alive. Used to detect unresponsive senders faster than
* typical TCP timeouts. The minimum value is 5 seconds, there is no upper
* bound enforced but practically it's minutes before platform TCP timeouts
* come into play. Default value is 10 seconds.
* @type {number|undefined}
**/
appConfig.maxInactivity = 6000; // 10 minutes for testing, use default 10sec in prod by not setting this value
/**
* Initializes the system manager. The application should call this method when
* it is ready to start receiving messages, typically after registering
* to listen for the events it is interested on.
*/
window.castReceiverManager.start(appConfig);
}
</script>
</body>
</html>