forked from ionorg/ion-sfu
/
publisher.go
450 lines (388 loc) · 11.2 KB
/
publisher.go
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
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
package sfu
import (
"fmt"
"io"
"sync"
"sync/atomic"
"time"
"github.com/pion/transport/packetio"
"github.com/rmh-media/ion-sfu/pkg/buffer"
"github.com/pion/rtcp"
"github.com/pion/webrtc/v3"
"github.com/rmh-media/ion-sfu/pkg/relay"
)
type Publisher struct {
mu sync.RWMutex
id string
pc *webrtc.PeerConnection
cfg *WebRTCTransportConfig
router Router
session Session
tracks []PublisherTrack
relayed atomicBool
relayPeers []*relayPeer
candidates []webrtc.ICECandidateInit
onICEConnectionStateChangeHandler atomic.Value // func(webrtc.ICEConnectionState)
onPublisherTrack atomic.Value // func(PublisherTrack)
closeOnce sync.Once
}
type relayPeer struct {
peer *relay.Peer
dcs []*webrtc.DataChannel
withSRReports bool
relayFanOutDataChannels bool
}
type PublisherTrack struct {
Track *webrtc.TrackRemote
Receiver Receiver
// This will be used in the future for tracks that will be relayed as clients or servers
// This is for SVC and Simulcast where you will be able to chose if the relayed peer just
// want a single track (for recording/ processing) or get all the tracks (for load balancing)
clientRelay bool
}
// NewPublisher creates a new Publisher
func NewPublisher(id string, session Session, cfg *WebRTCTransportConfig) (*Publisher, error) {
me, err := getPublisherMediaEngine()
if err != nil {
Logger.Error(err, "NewPeer error", "peer_id", id)
return nil, errPeerConnectionInitFailed
}
api := webrtc.NewAPI(webrtc.WithMediaEngine(me), webrtc.WithSettingEngine(cfg.Setting))
pc, err := api.NewPeerConnection(cfg.Configuration)
if err != nil {
Logger.Error(err, "NewPeer error", "peer_id", id)
return nil, errPeerConnectionInitFailed
}
p := &Publisher{
id: id,
pc: pc,
cfg: cfg,
router: newRouter(id, session, cfg),
session: session,
}
pc.OnTrack(func(track *webrtc.TrackRemote, receiver *webrtc.RTPReceiver) {
Logger.V(1).Info("Peer got remote track id",
"peer_id", p.id,
"track_id", track.ID(),
"mediaSSRC", track.SSRC(),
"rid", track.RID(),
"stream_id", track.StreamID(),
)
r, pub := p.router.AddReceiver(receiver, track, track.ID(), track.StreamID())
if pub {
p.session.Publish(p.router, r)
p.mu.Lock()
publisherTrack := PublisherTrack{track, r, true}
p.tracks = append(p.tracks, publisherTrack)
for _, rp := range p.relayPeers {
if err = p.createRelayTrack(track, r, rp.peer); err != nil {
Logger.V(1).Error(err, "Creating relay track.", "peer_id", p.id)
}
}
p.mu.Unlock()
if handler, ok := p.onPublisherTrack.Load().(func(PublisherTrack)); ok && handler != nil {
handler(publisherTrack)
}
} else {
p.mu.Lock()
p.tracks = append(p.tracks, PublisherTrack{track, r, false})
p.mu.Unlock()
}
})
pc.OnDataChannel(func(dc *webrtc.DataChannel) {
if dc.Label() == APIChannelLabel {
// terminate api data channel
return
}
p.session.AddDatachannel(id, dc)
})
pc.OnICEConnectionStateChange(func(connectionState webrtc.ICEConnectionState) {
Logger.V(1).Info("ice connection status", "state", connectionState)
switch connectionState {
case webrtc.ICEConnectionStateFailed:
fallthrough
case webrtc.ICEConnectionStateClosed:
Logger.V(1).Info("webrtc ice closed", "peer_id", p.id)
p.Close()
}
if handler, ok := p.onICEConnectionStateChangeHandler.Load().(func(webrtc.ICEConnectionState)); ok && handler != nil {
handler(connectionState)
}
})
p.router.SetRTCPWriter(p.pc.WriteRTCP)
return p, nil
}
func (p *Publisher) Answer(offer webrtc.SessionDescription) (webrtc.SessionDescription, error) {
if err := p.pc.SetRemoteDescription(offer); err != nil {
return webrtc.SessionDescription{}, err
}
for _, c := range p.candidates {
if err := p.pc.AddICECandidate(c); err != nil {
Logger.Error(err, "Add publisher ice candidate to peer err", "peer_id", p.id)
}
}
p.candidates = nil
answer, err := p.pc.CreateAnswer(nil)
if err != nil {
return webrtc.SessionDescription{}, err
}
if err := p.pc.SetLocalDescription(answer); err != nil {
return webrtc.SessionDescription{}, err
}
return answer, nil
}
// GetRouter returns Router with mediaSSRC
func (p *Publisher) GetRouter() Router {
return p.router
}
// Close peer
func (p *Publisher) Close() {
p.closeOnce.Do(func() {
if len(p.relayPeers) > 0 {
p.mu.Lock()
for _, rp := range p.relayPeers {
if err := rp.peer.Close(); err != nil {
Logger.Error(err, "Closing relay peer transport.")
}
}
p.mu.Unlock()
}
p.router.Stop()
if err := p.pc.Close(); err != nil {
Logger.Error(err, "webrtc transport close err")
}
})
}
func (p *Publisher) OnPublisherTrack(f func(track PublisherTrack)) {
p.onPublisherTrack.Store(f)
}
// OnICECandidate handler
func (p *Publisher) OnICECandidate(f func(c *webrtc.ICECandidate)) {
p.pc.OnICECandidate(f)
}
func (p *Publisher) OnICEConnectionStateChange(f func(connectionState webrtc.ICEConnectionState)) {
p.onICEConnectionStateChangeHandler.Store(f)
}
func (p *Publisher) SignalingState() webrtc.SignalingState {
return p.pc.SignalingState()
}
func (p *Publisher) PeerConnection() *webrtc.PeerConnection {
return p.pc
}
// Relay will relay all current and future tracks from current Publisher
func (p *Publisher) Relay(signalFn func(meta relay.PeerMeta, signal []byte) ([]byte, error),
options ...func(r *relayPeer)) (*relay.Peer, error) {
lrp := &relayPeer{}
for _, o := range options {
o(lrp)
}
rp, err := relay.NewPeer(relay.PeerMeta{
PeerID: p.id,
SessionID: p.session.ID(),
}, &relay.PeerConfig{
SettingEngine: p.cfg.Setting,
ICEServers: p.cfg.Configuration.ICEServers,
Logger: Logger,
})
if err != nil {
return nil, fmt.Errorf("relay: %w", err)
}
lrp.peer = rp
rp.OnReady(func() {
peer := p.session.GetPeer(p.id)
p.relayed.set(true)
if lrp.relayFanOutDataChannels {
for _, lbl := range p.session.GetFanOutDataChannelLabels() {
lbl := lbl
dc, err := rp.CreateDataChannel(lbl)
if err != nil {
Logger.V(1).Error(err, "Creating data channels.", "peer_id", p.id)
continue
}
dc.OnMessage(func(msg webrtc.DataChannelMessage) {
if peer == nil || peer.Subscriber() == nil {
return
}
if sdc := peer.Subscriber().DataChannel(lbl); sdc != nil {
if msg.IsString {
if err = sdc.SendText(string(msg.Data)); err != nil {
Logger.Error(err, "Sending dc message err")
}
} else {
if err = sdc.Send(msg.Data); err != nil {
Logger.Error(err, "Sending dc message err")
}
}
}
})
}
}
p.mu.Lock()
for _, tp := range p.tracks {
if !tp.clientRelay {
// simulcast will just relay client track for now
continue
}
if err = p.createRelayTrack(tp.Track, tp.Receiver, rp); err != nil {
Logger.V(1).Error(err, "Creating relay track.", "peer_id", p.id)
}
}
p.relayPeers = append(p.relayPeers, lrp)
p.mu.Unlock()
if lrp.withSRReports {
go p.relayReports(rp)
}
})
rp.OnDataChannel(func(channel *webrtc.DataChannel) {
if !lrp.relayFanOutDataChannels {
return
}
p.mu.Lock()
lrp.dcs = append(lrp.dcs, channel)
p.mu.Unlock()
p.session.AddDatachannel("", channel)
})
if err = rp.Offer(signalFn); err != nil {
return nil, fmt.Errorf("relay: %w", err)
}
return rp, nil
}
func (p *Publisher) PublisherTracks() []PublisherTrack {
p.mu.Lock()
defer p.mu.Unlock()
tracks := make([]PublisherTrack, len(p.tracks))
for idx, track := range p.tracks {
tracks[idx] = track
}
return tracks
}
// AddRelayFanOutDataChannel adds fan out data channel to relayed peers
func (p *Publisher) AddRelayFanOutDataChannel(label string) {
p.mu.RLock()
defer p.mu.RUnlock()
for _, rp := range p.relayPeers {
for _, dc := range rp.dcs {
if dc.Label() == label {
continue
}
}
dc, err := rp.peer.CreateDataChannel(label)
if err != nil {
Logger.V(1).Error(err, "Creating data channels.", "peer_id", p.id)
}
dc.OnMessage(func(msg webrtc.DataChannelMessage) {
p.session.FanOutMessage("", label, msg)
})
}
}
// GetRelayedDataChannels Returns a slice of data channels that belongs to relayed
// peers
func (p *Publisher) GetRelayedDataChannels(label string) []*webrtc.DataChannel {
p.mu.RLock()
defer p.mu.RUnlock()
dcs := make([]*webrtc.DataChannel, 0, len(p.relayPeers))
for _, rp := range p.relayPeers {
for _, dc := range rp.dcs {
if dc.Label() == label {
dcs = append(dcs, dc)
break
}
}
}
return dcs
}
// Relayed returns true if the publisher has been relayed at least once
func (p *Publisher) Relayed() bool {
return p.relayed.get()
}
func (p *Publisher) Tracks() []*webrtc.TrackRemote {
p.mu.RLock()
defer p.mu.RUnlock()
tracks := make([]*webrtc.TrackRemote, len(p.tracks))
for idx, track := range p.tracks {
tracks[idx] = track.Track
}
return tracks
}
// AddICECandidate to peer connection
func (p *Publisher) AddICECandidate(candidate webrtc.ICECandidateInit) error {
if p.pc.RemoteDescription() != nil {
return p.pc.AddICECandidate(candidate)
}
p.candidates = append(p.candidates, candidate)
return nil
}
func (p *Publisher) createRelayTrack(track *webrtc.TrackRemote, receiver Receiver, rp *relay.Peer) error {
codec := track.Codec()
downTrack, err := NewDownTrack(webrtc.RTPCodecCapability{
MimeType: codec.MimeType,
ClockRate: codec.ClockRate,
Channels: codec.Channels,
SDPFmtpLine: codec.SDPFmtpLine,
RTCPFeedback: []webrtc.RTCPFeedback{{"nack", ""}, {"nack", "pli"}},
}, receiver, p.cfg.BufferFactory, p.id, p.cfg.Router.MaxPacketTrack)
if err != nil {
Logger.V(1).Error(err, "Create Relay downtrack err", "peer_id", p.id)
return err
}
sdr, err := rp.AddTrack(receiver.(*WebRTCReceiver).receiver, track, downTrack)
if err != nil {
Logger.V(1).Error(err, "Relaying track.", "peer_id", p.id)
return fmt.Errorf("relay: %w", err)
}
p.cfg.BufferFactory.GetOrNew(packetio.RTCPBufferPacket,
uint32(sdr.GetParameters().Encodings[0].SSRC)).(*buffer.RTCPReader).OnPacket(func(bytes []byte) {
pkts, err := rtcp.Unmarshal(bytes)
if err != nil {
Logger.V(1).Error(err, "Unmarshal rtcp reports", "peer_id", p.id)
return
}
var rpkts []rtcp.Packet
for _, pkt := range pkts {
switch pk := pkt.(type) {
case *rtcp.PictureLossIndication:
rpkts = append(rpkts, &rtcp.PictureLossIndication{
SenderSSRC: pk.MediaSSRC,
MediaSSRC: uint32(track.SSRC()),
})
}
}
if len(rpkts) > 0 {
if err := p.pc.WriteRTCP(rpkts); err != nil {
Logger.V(1).Error(err, "Sending rtcp relay reports", "peer_id", p.id)
}
}
})
downTrack.OnCloseHandler(func() {
if err = sdr.Stop(); err != nil {
Logger.V(1).Error(err, "Stopping relay sender.", "peer_id", p.id)
}
})
receiver.AddDownTrack(downTrack, true)
return nil
}
func (p *Publisher) relayReports(rp *relay.Peer) {
for {
time.Sleep(5 * time.Second)
var r []rtcp.Packet
for _, t := range rp.LocalTracks() {
if dt, ok := t.(*DownTrack); ok {
if !dt.bound.get() {
continue
}
if sr := dt.CreateSenderReport(); sr != nil {
r = append(r, sr)
}
}
}
if len(r) == 0 {
continue
}
if err := rp.WriteRTCP(r); err != nil {
if err == io.EOF || err == io.ErrClosedPipe {
return
}
Logger.Error(err, "Sending downtrack reports err")
}
}
}