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/*!
* Webchat WebRTC application
* https://arthurdejong.org/webchat/
*
* Copyright (C) 2020 Arthur de Jong
*
* Released under the GNU General Public License, either version 3, or
* (at your option) any later version.
*/
// make jQuery available so Bootstrap notices
window.jQuery = jQuery
require('bootstrap')
require('bootstrap/scss/bootstrap.scss')
require('@fortawesome/fontawesome-free/js/all')
require('./webchat.css')
require('webrtc-adapter')
const Server = require('./comm.js')
const WebRTC = require('./webrtc.js')
require('./volumeindicator')
/**
* Return the size of each item to fit the specified container.
*/
function optimalSize(count, width, height, ratio) {
var currentWaste = width * height
var currentR = 0
count = Math.max(count, 2)
for (var cols = 1; cols <= count; cols++) {
var rows = Math.ceil(count / cols)
const r = Math.min(width / ratio / cols, height / rows)
const waste = width * height - count * ratio * r * r
if (waste <= currentWaste) {
currentWaste = waste
currentR = r
}
}
return {width: currentR * ratio, height: currentR}
}
function updateGrid() {
var container = $('#video-container')
var res = optimalSize(container.children().length, container.width(), container.height(), 4 / 3)
container.children().css('width', res.width)
container.children().css('height', res.height)
}
$(document).ready(function () {
// do not close the dropdown when selecting a mic or camera
$(document).on('click', '.dropdown-menu', function (e) {
if ($(this).hasClass('keep-open-on-click')) { e.stopPropagation() }
})
// re-layout the video grid on screen size changes
$(window).resize(function () {
updateGrid()
})
updateGrid()
function showStream(video, stream, identity) {
// play the video
console.log('showStream', stream)
video.stream = stream
video.identity = identity
video.volume = 0
if ('srcObject' in video) {
video.srcObject = stream
} else {
video.src = URL.createObjectURL(stream)
}
video.onloadedmetadata = function (e) {
video.play()
video.muted = true
}
// set up the volume meter
$(video).volumeindicator(stream)
}
// show video and connection information
$('#video-container').on('show.bs.dropdown', '.video-info', function () {
var video = $(this).siblings('video')
var peerConnection = video[0].peerConnection
var identity = video[0].identity
var menu = $(this).find('.dropdown-menu')
menu.empty()
if (peerConnection) {
menu.append($('<span class="dropdown-item-text"></span>').text('connection:' + peerConnection.connectionState))
menu.append($('<span class="dropdown-item-text"></span>').text('ICE: ' + peerConnection.iceConnectionState))
menu.append($('<span class="dropdown-item-text"></span>').text('signaling: ' + peerConnection.signalingState))
}
if (identity) {
menu.append($('<span class="dropdown-item-text"></span>').text('ID: ' + identity))
}
})
// set up a connection with the back-end server for message passing
var server = new Server()
server.ready(function () {
// set up addition and removal of peer connections
var webrtc = new WebRTC(server, function (event, peerConnection, identity) {
if (event.track.kind === 'video') {
var clone = $('#videotemplate>:first-child').clone()
clone.prop('id', 'peer-' + identity)
$('#video-container').prepend(clone)
var video = clone.find('video')[0]
var stream = event.streams[0]
video.stream = stream
video.peerConnection = peerConnection
video.identity = identity
if ('srcObject' in video) {
video.srcObject = stream
} else {
video.src = URL.createObjectURL(stream)
}
video.onloadedmetadata = function (e) {
video.play()
}
$(video).volumeindicator(stream)
updateGrid()
}
}, function (event, peerConnection, identity) {
if (peerConnection.connectionState === 'failed' || peerConnection.connectionState === 'disconnected') {
$('#peer-' + identity).remove()
updateGrid()
}
})
server.onMessage(function (msg) {
if (msg.message) {
$('#messages').append($('<div class="alert alert-primary">').text(msg.message))
// scroll to bottom
var messagesDiv = document.getElementById('messages')
messagesDiv.scrollTop = messagesDiv.scrollHeight
} else {
webrtc.handleMessage(msg)
}
})
var constraints = {
audio: true,
video: {width: 640, height: 480},
resizeMode: 'crop-and-scale'
}
navigator.mediaDevices.getUserMedia(constraints)
.then(stream => {
console.log('Got MediaStream:', stream)
stream.getVideoTracks().forEach(track => { track.applyConstraints({frameRate: {max: 10}}) })
showStream($('#me video')[0], stream, webrtc.identity)
webrtc.addStream(stream)
})
.catch(error => {
alert('Error accessing media devices: ' + error)
})
// send chat messages across the channel
$('#message-input').submit(function (event) {
var message = $(this).find('input').val()
if (message) {
var msg = {message: message, sender: webrtc.identity}
server.sendMessage(msg)
}
$(this).find('input').val('')
event.preventDefault()
})
})
})
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