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
|
//go:build !js
// +build !js
package webrtc
import (
"sync/atomic"
"github.com/pion/interceptor"
"github.com/pion/interceptor/pkg/nack"
"github.com/pion/interceptor/pkg/report"
"github.com/pion/interceptor/pkg/twcc"
"github.com/pion/rtp"
"github.com/pion/sdp/v3"
)
// RegisterDefaultInterceptors will register some useful interceptors.
// If you want to customize which interceptors are loaded, you should copy the
// code from this method and remove unwanted interceptors.
func RegisterDefaultInterceptors(mediaEngine *MediaEngine, interceptorRegistry *interceptor.Registry) error {
if err := ConfigureNack(mediaEngine, interceptorRegistry); err != nil {
return err
}
if err := ConfigureRTCPReports(interceptorRegistry); err != nil {
return err
}
if err := ConfigureTWCCSender(mediaEngine, interceptorRegistry); err != nil {
return err
}
return nil
}
// ConfigureRTCPReports will setup everything necessary for generating Sender and Receiver Reports
func ConfigureRTCPReports(interceptorRegistry *interceptor.Registry) error {
reciver, err := report.NewReceiverInterceptor()
if err != nil {
return err
}
sender, err := report.NewSenderInterceptor()
if err != nil {
return err
}
interceptorRegistry.Add(reciver)
interceptorRegistry.Add(sender)
return nil
}
// ConfigureNack will setup everything necessary for handling generating/responding to nack messages.
func ConfigureNack(mediaEngine *MediaEngine, interceptorRegistry *interceptor.Registry) error {
generator, err := nack.NewGeneratorInterceptor()
if err != nil {
return err
}
responder, err := nack.NewResponderInterceptor()
if err != nil {
return err
}
mediaEngine.RegisterFeedback(RTCPFeedback{Type: "nack"}, RTPCodecTypeVideo)
mediaEngine.RegisterFeedback(RTCPFeedback{Type: "nack", Parameter: "pli"}, RTPCodecTypeVideo)
interceptorRegistry.Add(responder)
interceptorRegistry.Add(generator)
return nil
}
// ConfigureTWCCHeaderExtensionSender will setup everything necessary for adding
// a TWCC header extension to outgoing RTP packets. This will allow the remote peer to generate TWCC reports.
func ConfigureTWCCHeaderExtensionSender(mediaEngine *MediaEngine, interceptorRegistry *interceptor.Registry) error {
if err := mediaEngine.RegisterHeaderExtension(RTPHeaderExtensionCapability{URI: sdp.TransportCCURI}, RTPCodecTypeVideo); err != nil {
return err
}
if err := mediaEngine.RegisterHeaderExtension(RTPHeaderExtensionCapability{URI: sdp.TransportCCURI}, RTPCodecTypeAudio); err != nil {
return err
}
i, err := twcc.NewHeaderExtensionInterceptor()
if err != nil {
return err
}
interceptorRegistry.Add(i)
return nil
}
// ConfigureTWCCSender will setup everything necessary for generating TWCC reports.
func ConfigureTWCCSender(mediaEngine *MediaEngine, interceptorRegistry *interceptor.Registry) error {
mediaEngine.RegisterFeedback(RTCPFeedback{Type: TypeRTCPFBTransportCC}, RTPCodecTypeVideo)
if err := mediaEngine.RegisterHeaderExtension(RTPHeaderExtensionCapability{URI: sdp.TransportCCURI}, RTPCodecTypeVideo); err != nil {
return err
}
mediaEngine.RegisterFeedback(RTCPFeedback{Type: TypeRTCPFBTransportCC}, RTPCodecTypeAudio)
if err := mediaEngine.RegisterHeaderExtension(RTPHeaderExtensionCapability{URI: sdp.TransportCCURI}, RTPCodecTypeAudio); err != nil {
return err
}
generator, err := twcc.NewSenderInterceptor()
if err != nil {
return err
}
interceptorRegistry.Add(generator)
return nil
}
type interceptorToTrackLocalWriter struct{ interceptor atomic.Value } // interceptor.RTPWriter }
func (i *interceptorToTrackLocalWriter) WriteRTP(header *rtp.Header, payload []byte) (int, error) {
if writer, ok := i.interceptor.Load().(interceptor.RTPWriter); ok && writer != nil {
return writer.Write(header, payload, interceptor.Attributes{})
}
return 0, nil
}
func (i *interceptorToTrackLocalWriter) Write(b []byte) (int, error) {
packet := &rtp.Packet{}
if err := packet.Unmarshal(b); err != nil {
return 0, err
}
return i.WriteRTP(&packet.Header, packet.Payload)
}
func createStreamInfo(id string, ssrc SSRC, payloadType PayloadType, codec RTPCodecCapability, webrtcHeaderExtensions []RTPHeaderExtensionParameter) *interceptor.StreamInfo {
headerExtensions := make([]interceptor.RTPHeaderExtension, 0, len(webrtcHeaderExtensions))
for _, h := range webrtcHeaderExtensions {
headerExtensions = append(headerExtensions, interceptor.RTPHeaderExtension{ID: h.ID, URI: h.URI})
}
feedbacks := make([]interceptor.RTCPFeedback, 0, len(codec.RTCPFeedback))
for _, f := range codec.RTCPFeedback {
feedbacks = append(feedbacks, interceptor.RTCPFeedback{Type: f.Type, Parameter: f.Parameter})
}
return &interceptor.StreamInfo{
ID: id,
Attributes: interceptor.Attributes{},
SSRC: uint32(ssrc),
PayloadType: uint8(payloadType),
RTPHeaderExtensions: headerExtensions,
MimeType: codec.MimeType,
ClockRate: codec.ClockRate,
Channels: codec.Channels,
SDPFmtpLine: codec.SDPFmtpLine,
RTCPFeedback: feedbacks,
}
}
|
