forked from feross/simple-peer
/
index.js
194 lines (171 loc) · 6 KB
/
index.js
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
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
/*! simple-peer. MIT License. Feross Aboukhadijeh <https://feross.org/opensource> */
import Lite from './lite.js'
import errCode from 'err-code'
/**
* WebRTC peer connection. Same API as node core `net.Socket`, plus a few extra methods.
* Duplex stream.
* @param {Object} opts
*/
class Peer extends Lite {
constructor (opts = {}) {
super(opts)
if (!this._pc) return
this.streams = opts.streams || (opts.stream ? [opts.stream] : []) // support old "stream" option
this._senderMap = new Map()
if (this.streams) {
this.streams.forEach(stream => {
this.addStream(stream)
})
}
this._pc.ontrack = event => {
this._onTrack(event)
}
}
/**
* Add a Transceiver to the connection.
* @param {String} kind
* @param {Object=} init
*/
addTransceiver (kind, init) {
if (this._destroying) return
if (this.destroyed) throw errCode(new Error('cannot addTransceiver after peer is destroyed'), 'ERR_DESTROYED')
this._debug('addTransceiver()')
if (this.initiator) {
try {
this._pc.addTransceiver(kind, init)
this._needsNegotiation()
} catch (err) {
this.__destroy(errCode(err, 'ERR_ADD_TRANSCEIVER'))
}
} else {
this.emit('signal', { // request initiator to renegotiate
type: 'transceiverRequest',
transceiverRequest: { kind, init }
})
}
}
/**
* Add a MediaStream to the connection.
* @param {MediaStream} stream
*/
addStream (stream) {
if (this._destroying) return
if (this.destroyed) throw errCode(new Error('cannot addStream after peer is destroyed'), 'ERR_DESTROYED')
this._debug('addStream()')
stream.getTracks().forEach(track => {
this.addTrack(track, stream)
})
}
/**
* Add a MediaStreamTrack to the connection.
* @param {MediaStreamTrack} track
* @param {MediaStream} stream
*/
addTrack (track, stream) {
if (this._destroying) return
if (this.destroyed) throw errCode(new Error('cannot addTrack after peer is destroyed'), 'ERR_DESTROYED')
this._debug('addTrack()')
const submap = this._senderMap.get(track) || new Map() // nested Maps map [track, stream] to sender
let sender = submap.get(stream)
if (!sender) {
sender = this._pc.addTrack(track, stream)
submap.set(stream, sender)
this._senderMap.set(track, submap)
this._needsNegotiation()
} else if (sender.removed) {
throw errCode(new Error('Track has been removed. You should enable/disable tracks that you want to re-add.'), 'ERR_SENDER_REMOVED')
} else {
throw errCode(new Error('Track has already been added to that stream.'), 'ERR_SENDER_ALREADY_ADDED')
}
}
/**
* Replace a MediaStreamTrack by another in the connection.
* @param {MediaStreamTrack} oldTrack
* @param {MediaStreamTrack} newTrack
* @param {MediaStream} stream
*/
replaceTrack (oldTrack, newTrack, stream) {
if (this._destroying) return
if (this.destroyed) throw errCode(new Error('cannot replaceTrack after peer is destroyed'), 'ERR_DESTROYED')
this._debug('replaceTrack()')
const submap = this._senderMap.get(oldTrack)
const sender = submap ? submap.get(stream) : null
if (!sender) {
throw errCode(new Error('Cannot replace track that was never added.'), 'ERR_TRACK_NOT_ADDED')
}
if (newTrack) this._senderMap.set(newTrack, submap)
if (sender.replaceTrack != null) {
sender.replaceTrack(newTrack)
} else {
this.__destroy(errCode(new Error('replaceTrack is not supported in this browser'), 'ERR_UNSUPPORTED_REPLACETRACK'))
}
}
/**
* Remove a MediaStreamTrack from the connection.
* @param {MediaStreamTrack} track
* @param {MediaStream} stream
*/
removeTrack (track, stream) {
if (this._destroying) return
if (this.destroyed) throw errCode(new Error('cannot removeTrack after peer is destroyed'), 'ERR_DESTROYED')
this._debug('removeSender()')
const submap = this._senderMap.get(track)
const sender = submap ? submap.get(stream) : null
if (!sender) {
throw errCode(new Error('Cannot remove track that was never added.'), 'ERR_TRACK_NOT_ADDED')
}
try {
sender.removed = true
this._pc.removeTrack(sender)
} catch (err) {
if (err.name === 'NS_ERROR_UNEXPECTED') {
this._sendersAwaitingStable.push(sender) // HACK: Firefox must wait until (signalingState === stable) https://bugzilla.mozilla.org/show_bug.cgi?id=1133874
} else {
this.__destroy(errCode(err, 'ERR_REMOVE_TRACK'))
}
}
this._needsNegotiation()
}
/**
* Remove a MediaStream from the connection.
* @param {MediaStream} stream
*/
removeStream (stream) {
if (this._destroying) return
if (this.destroyed) throw errCode(new Error('cannot removeStream after peer is destroyed'), 'ERR_DESTROYED')
this._debug('removeSenders()')
stream.getTracks().forEach(track => {
this.removeTrack(track, stream)
})
}
_requestMissingTransceivers () {
if (this._pc.getTransceivers) {
this._pc.getTransceivers().forEach(transceiver => {
if (!transceiver.mid && transceiver.sender.track && !transceiver.requested) {
transceiver.requested = true // HACK: Safari returns negotiated transceivers with a null mid
this.addTransceiver(transceiver.sender.track.kind)
}
})
}
}
_onTrack (event) {
if (this.destroyed) return
event.streams.forEach(eventStream => {
this._debug('on track')
this.emit('track', event.track, eventStream)
this._remoteTracks.push({
track: event.track,
stream: eventStream
})
if (this._remoteStreams.some(remoteStream => {
return remoteStream.id === eventStream.id
})) return // Only fire one 'stream' event, even though there may be multiple tracks per stream
this._remoteStreams.push(eventStream)
queueMicrotask(() => {
this._debug('on stream')
this.emit('stream', eventStream) // ensure all tracks have been added
})
})
}
}
export default Peer