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index.js
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index.js
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/*
* (C) Copyright 2014-2015 Kurento (http://kurento.org/)
*
* 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.
*
*/
var ws = new WebSocket('wss://' + location.host + '/helloworld');
var videoInput;
var videoOutput;
var webRtcPeer;
var state = null;
const I_CAN_START = 0;
const I_CAN_STOP = 1;
const I_AM_STARTING = 2;
window.onload = function() {
console = new Console();
console.log('Page loaded ...');
videoInput = document.getElementById('videoInput');
videoOutput = document.getElementById('videoOutput');
setState(I_CAN_START);
}
window.onbeforeunload = function() {
ws.close();
}
ws.onmessage = function(message) {
var parsedMessage = JSON.parse(message.data);
console.info('Received message: ' + message.data);
switch (parsedMessage.id) {
case 'startResponse':
startResponse(parsedMessage);
break;
case 'error':
if (state == I_AM_STARTING) {
setState(I_CAN_START);
}
onError('Error message from server: ' + parsedMessage.message);
break;
case 'iceCandidate':
webRtcPeer.addIceCandidate(parsedMessage.candidate)
break;
default:
if (state == I_AM_STARTING) {
setState(I_CAN_START);
}
onError('Unrecognized message', parsedMessage);
}
}
function start() {
console.log('Starting video call ...')
// Disable start button
setState(I_AM_STARTING);
showSpinner(videoInput, videoOutput);
console.log('Creating WebRtcPeer and generating local sdp offer ...');
var options = {
localVideo: videoInput,
remoteVideo: videoOutput,
onicecandidate : onIceCandidate
}
webRtcPeer = kurentoUtils.WebRtcPeer.WebRtcPeerSendrecv(options, function(error) {
if(error) return onError(error);
this.generateOffer(onOffer);
});
}
function onIceCandidate(candidate) {
console.log('Local candidate' + JSON.stringify(candidate));
var message = {
id : 'onIceCandidate',
candidate : candidate
};
sendMessage(message);
}
function onOffer(error, offerSdp) {
if(error) return onError(error);
console.info('Invoking SDP offer callback function ' + location.host);
var message = {
id : 'start',
sdpOffer : offerSdp
}
sendMessage(message);
}
function onError(error) {
console.error(error);
}
function startResponse(message) {
setState(I_CAN_STOP);
console.log('SDP answer received from server. Processing ...');
webRtcPeer.processAnswer(message.sdpAnswer);
}
function stop() {
console.log('Stopping video call ...');
setState(I_CAN_START);
if (webRtcPeer) {
webRtcPeer.dispose();
webRtcPeer = null;
var message = {
id : 'stop'
}
sendMessage(message);
}
hideSpinner(videoInput, videoOutput);
}
function setState(nextState) {
switch (nextState) {
case I_CAN_START:
$('#start').attr('disabled', false);
$('#start').attr('onclick', 'start()');
$('#stop').attr('disabled', true);
$('#stop').removeAttr('onclick');
break;
case I_CAN_STOP:
$('#start').attr('disabled', true);
$('#stop').attr('disabled', false);
$('#stop').attr('onclick', 'stop()');
break;
case I_AM_STARTING:
$('#start').attr('disabled', true);
$('#start').removeAttr('onclick');
$('#stop').attr('disabled', true);
$('#stop').removeAttr('onclick');
break;
default:
onError('Unknown state ' + nextState);
return;
}
state = nextState;
}
function sendMessage(message) {
var jsonMessage = JSON.stringify(message);
console.log('Sending message: ' + jsonMessage);
ws.send(jsonMessage);
}
function showSpinner() {
for (var i = 0; i < arguments.length; i++) {
arguments[i].poster = './img/transparent-1px.png';
arguments[i].style.background = 'center transparent url("./img/spinner.gif") no-repeat';
}
}
function hideSpinner() {
for (var i = 0; i < arguments.length; i++) {
arguments[i].src = '';
arguments[i].poster = './img/webrtc.png';
arguments[i].style.background = '';
}
}
/**
* Lightbox utility (to display media pipeline image in a modal dialog)
*/
$(document).delegate('*[data-toggle="lightbox"]', 'click', function(event) {
event.preventDefault();
$(this).ekkoLightbox();
});