-
Notifications
You must be signed in to change notification settings - Fork 295
/
conn.go
196 lines (163 loc) · 4.28 KB
/
conn.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
package webrtc
import (
"time"
"github.com/AlexxIT/go2rtc/pkg/core"
"github.com/pion/rtcp"
"github.com/pion/rtp"
"github.com/pion/webrtc/v3"
)
type Conn struct {
core.Listener
UserAgent string
Desc string
Mode core.Mode
pc *webrtc.PeerConnection
medias []*core.Media
receivers []*core.Receiver
senders []*core.Sender
recv int
send int
offer string
remote string
closed core.Waiter
}
func NewConn(pc *webrtc.PeerConnection) *Conn {
c := &Conn{pc: pc}
pc.OnICECandidate(func(candidate *webrtc.ICECandidate) {
// last candidate will be empty
if candidate != nil {
c.Fire(candidate)
}
})
pc.OnDataChannel(func(channel *webrtc.DataChannel) {
c.Fire(channel)
})
pc.OnICEConnectionStateChange(func(state webrtc.ICEConnectionState) {
if state != webrtc.ICEConnectionStateChecking {
return
}
pc.SCTP().Transport().ICETransport().OnSelectedCandidatePairChange(
func(pair *webrtc.ICECandidatePair) {
c.remote = pair.Remote.String()
},
)
})
pc.OnTrack(func(remote *webrtc.TrackRemote, receiver *webrtc.RTPReceiver) {
media, codec := c.getMediaCodec(remote)
if media == nil {
return
}
track, err := c.GetTrack(media, codec)
if err != nil {
return
}
switch c.Mode {
case core.ModePassiveProducer, core.ModeActiveProducer:
// replace the theoretical list of codecs with the actual list of codecs
if len(media.Codecs) > 1 {
media.Codecs = []*core.Codec{codec}
}
}
if c.Mode == core.ModePassiveProducer && remote.Kind() == webrtc.RTPCodecTypeVideo {
go func() {
pkts := []rtcp.Packet{&rtcp.PictureLossIndication{MediaSSRC: uint32(remote.SSRC())}}
for range time.NewTicker(time.Second * 2).C {
if err := pc.WriteRTCP(pkts); err != nil {
return
}
}
}()
}
for {
b := make([]byte, ReceiveMTU)
n, _, err := remote.Read(b)
if err != nil {
return
}
c.recv += n
packet := &rtp.Packet{}
if err := packet.Unmarshal(b[:n]); err != nil {
return
}
if len(packet.Payload) == 0 {
continue
}
track.WriteRTP(packet)
}
})
// OK connection:
// 15:01:46 ICE connection state changed: checking
// 15:01:46 peer connection state changed: connected
// 15:01:54 peer connection state changed: disconnected
// 15:02:20 peer connection state changed: failed
//
// Fail connection:
// 14:53:08 ICE connection state changed: checking
// 14:53:39 peer connection state changed: failed
pc.OnConnectionStateChange(func(state webrtc.PeerConnectionState) {
c.Fire(state)
switch state {
case webrtc.PeerConnectionStateConnected:
for _, sender := range c.senders {
sender.Start()
}
case webrtc.PeerConnectionStateDisconnected, webrtc.PeerConnectionStateFailed, webrtc.PeerConnectionStateClosed:
// disconnect event comes earlier, than failed
// but it comes only for success connections
_ = c.Close()
}
})
return c
}
func (c *Conn) Close() error {
c.closed.Done(nil)
return c.pc.Close()
}
func (c *Conn) AddCandidate(candidate string) error {
// pion uses only candidate value from json/object candidate struct
return c.pc.AddICECandidate(webrtc.ICECandidateInit{Candidate: candidate})
}
func (c *Conn) getTranseiver(mid string) *webrtc.RTPTransceiver {
for _, tr := range c.pc.GetTransceivers() {
if tr.Mid() == mid {
return tr
}
}
return nil
}
func (c *Conn) getSenderTrack(mid string) *Track {
if tr := c.getTranseiver(mid); tr != nil {
if s := tr.Sender(); s != nil {
if t := s.Track().(*Track); t != nil {
return t
}
}
}
return nil
}
func (c *Conn) getMediaCodec(remote *webrtc.TrackRemote) (*core.Media, *core.Codec) {
for _, tr := range c.pc.GetTransceivers() {
// search Transeiver for this TrackRemote
if tr.Receiver() == nil || tr.Receiver().Track() != remote {
continue
}
// search Media for this MID
for _, media := range c.medias {
if media.ID != tr.Mid() || media.Direction != core.DirectionRecvonly {
continue
}
// search codec for this PayloadType
for _, codec := range media.Codecs {
if codec.PayloadType != uint8(remote.PayloadType()) {
continue
}
return media, codec
}
}
}
// fix moment when core.ModePassiveProducer or core.ModeActiveProducer
// sends new codec with new payload type to same media
// check GetTrack
panic(core.Caller())
return nil, nil
}