1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
|
/* eslint-env browser */
// Create peer conn
const pc = new RTCPeerConnection({
iceServers: [
{
urls: 'stun:stun.l.google.com:19302'
}
]
})
pc.oniceconnectionstatechange = e => {
console.debug('connection state change', pc.iceConnectionState)
}
pc.onicecandidate = event => {
if (event.candidate === null) {
document.getElementById('localSessionDescription').value = btoa(JSON.stringify(pc.localDescription))
}
}
pc.onnegotiationneeded = e =>
pc.createOffer().then(d => pc.setLocalDescription(d)).catch(console.error)
pc.ontrack = event => {
console.log('Got track event', event)
document.getElementById('serverVideo').srcObject = new MediaStream([event.track])
}
const canvases = [
document.getElementById('canvasOne'),
document.getElementById('canvasTwo'),
document.getElementById('canvasThree')
]
// Firefox requires getContext to be invoked on an HTML Canvas Element
// prior to captureStream
const canvasContexts = canvases.map(c => c.getContext('2d'))
// Capture canvas streams and add to peer conn
const streams = canvases.map(c => c.captureStream())
streams.forEach(stream => stream.getVideoTracks().forEach(track => pc.addTrack(track, stream)))
// Start circles
requestAnimationFrame(() => drawCircle(canvasContexts[0], '#006699', 0))
requestAnimationFrame(() => drawCircle(canvasContexts[1], '#cf635f', 0))
requestAnimationFrame(() => drawCircle(canvasContexts[2], '#46c240', 0))
function drawCircle (ctx, color, angle) {
// Background
ctx.clearRect(0, 0, 200, 200)
ctx.fillStyle = '#eeeeee'
ctx.fillRect(0, 0, 200, 200)
// Draw and fill in circle
ctx.beginPath()
const radius = 25 + 50 * Math.abs(Math.cos(angle))
ctx.arc(100, 100, radius, 0, Math.PI * 2, false)
ctx.closePath()
ctx.fillStyle = color
ctx.fill()
// Call again
requestAnimationFrame(() => drawCircle(ctx, color, angle + (Math.PI / 64)))
}
window.startSession = () => {
const sd = document.getElementById('remoteSessionDescription').value
if (sd === '') {
return alert('Session Description must not be empty')
}
try {
pc.setRemoteDescription(JSON.parse(atob(sd)))
} catch (e) {
alert(e)
}
}
window.copySDP = () => {
const browserSDP = document.getElementById('localSessionDescription')
browserSDP.focus()
browserSDP.select()
try {
const successful = document.execCommand('copy')
const msg = successful ? 'successful' : 'unsuccessful'
console.log('Copying SDP was ' + msg)
} catch (err) {
console.log('Unable to copy SDP ' + err)
}
}
|
