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| 1 | +// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly> |
| 2 | +// SPDX-License-Identifier: MIT |
| 3 | + |
| 4 | +//go:build !js |
| 5 | +// +build !js |
| 6 | + |
| 7 | +// whip-whep demonstrates how to use the WHIP/WHEP specifications to exhange SPD descriptions and stream media to a WebRTC client in the browser or OBS |
| 8 | +package main |
| 9 | + |
| 10 | +import ( |
| 11 | + "fmt" |
| 12 | + "io" |
| 13 | + "net/http" |
| 14 | + |
| 15 | + "github.com/pion/interceptor" |
| 16 | + "github.com/pion/interceptor/pkg/intervalpli" |
| 17 | + "github.com/pion/webrtc/v4" |
| 18 | +) |
| 19 | + |
| 20 | +// nolint: gochecknoglobals |
| 21 | +var ( |
| 22 | + videoTrack *webrtc.TrackLocalStaticRTP |
| 23 | + |
| 24 | + peerConnectionConfiguration = webrtc.Configuration{ |
| 25 | + ICEServers: []webrtc.ICEServer{ |
| 26 | + { |
| 27 | + URLs: []string{"stun:stun.l.google.com:19302"}, |
| 28 | + }, |
| 29 | + }, |
| 30 | + } |
| 31 | +) |
| 32 | + |
| 33 | +// nolint:gocognit |
| 34 | +func main() { |
| 35 | + // Everything below is the Pion WebRTC API! Thanks for using it ❤️. |
| 36 | + var err error |
| 37 | + if videoTrack, err = webrtc.NewTrackLocalStaticRTP(webrtc.RTPCodecCapability{MimeType: webrtc.MimeTypeH264}, "video", "pion"); err != nil { |
| 38 | + panic(err) |
| 39 | + } |
| 40 | + |
| 41 | + http.Handle("/", http.FileServer(http.Dir("."))) |
| 42 | + http.HandleFunc("/whep", whepHandler) |
| 43 | + http.HandleFunc("/whip", whipHandler) |
| 44 | + |
| 45 | + fmt.Println("Open http://localhost:8080 to access this demo") |
| 46 | + panic(http.ListenAndServe(":8080", nil)) // nolint: gosec |
| 47 | +} |
| 48 | + |
| 49 | +func whipHandler(w http.ResponseWriter, r *http.Request) { |
| 50 | + // Read the offer from HTTP Request |
| 51 | + offer, err := io.ReadAll(r.Body) |
| 52 | + if err != nil { |
| 53 | + panic(err) |
| 54 | + } |
| 55 | + |
| 56 | + // Create a MediaEngine object to configure the supported codec |
| 57 | + m := &webrtc.MediaEngine{} |
| 58 | + |
| 59 | + // Setup the codecs you want to use. |
| 60 | + // We'll only use H264 but you can also define your own |
| 61 | + if err = m.RegisterCodec(webrtc.RTPCodecParameters{ |
| 62 | + RTPCodecCapability: webrtc.RTPCodecCapability{MimeType: webrtc.MimeTypeH264, ClockRate: 90000, Channels: 0, SDPFmtpLine: "", RTCPFeedback: nil}, |
| 63 | + PayloadType: 96, |
| 64 | + }, webrtc.RTPCodecTypeVideo); err != nil { |
| 65 | + panic(err) |
| 66 | + } |
| 67 | + |
| 68 | + // Create a InterceptorRegistry. This is the user configurable RTP/RTCP Pipeline. |
| 69 | + // This provides NACKs, RTCP Reports and other features. If you use `webrtc.NewPeerConnection` |
| 70 | + // this is enabled by default. If you are manually managing You MUST create a InterceptorRegistry |
| 71 | + // for each PeerConnection. |
| 72 | + i := &interceptor.Registry{} |
| 73 | + |
| 74 | + // Register a intervalpli factory |
| 75 | + // This interceptor sends a PLI every 3 seconds. A PLI causes a video keyframe to be generated by the sender. |
| 76 | + // This makes our video seekable and more error resilent, but at a cost of lower picture quality and higher bitrates |
| 77 | + // A real world application should process incoming RTCP packets from viewers and forward them to senders |
| 78 | + intervalPliFactory, err := intervalpli.NewReceiverInterceptor() |
| 79 | + if err != nil { |
| 80 | + panic(err) |
| 81 | + } |
| 82 | + i.Add(intervalPliFactory) |
| 83 | + |
| 84 | + // Use the default set of Interceptors |
| 85 | + if err = webrtc.RegisterDefaultInterceptors(m, i); err != nil { |
| 86 | + panic(err) |
| 87 | + } |
| 88 | + |
| 89 | + // Create the API object with the MediaEngine |
| 90 | + api := webrtc.NewAPI(webrtc.WithMediaEngine(m), webrtc.WithInterceptorRegistry(i)) |
| 91 | + |
| 92 | + // Prepare the configuration |
| 93 | + |
| 94 | + // Create a new RTCPeerConnection |
| 95 | + peerConnection, err := api.NewPeerConnection(peerConnectionConfiguration) |
| 96 | + if err != nil { |
| 97 | + panic(err) |
| 98 | + } |
| 99 | + |
| 100 | + // Allow us to receive 1 video trac |
| 101 | + if _, err = peerConnection.AddTransceiverFromKind(webrtc.RTPCodecTypeVideo); err != nil { |
| 102 | + panic(err) |
| 103 | + } |
| 104 | + |
| 105 | + // Set a handler for when a new remote track starts, this handler saves buffers to disk as |
| 106 | + // an ivf file, since we could have multiple video tracks we provide a counter. |
| 107 | + // In your application this is where you would handle/process video |
| 108 | + peerConnection.OnTrack(func(track *webrtc.TrackRemote, receiver *webrtc.RTPReceiver) { //nolint: revive |
| 109 | + for { |
| 110 | + pkt, _, err := track.ReadRTP() |
| 111 | + if err != nil { |
| 112 | + panic(err) |
| 113 | + } |
| 114 | + |
| 115 | + if err = videoTrack.WriteRTP(pkt); err != nil { |
| 116 | + panic(err) |
| 117 | + } |
| 118 | + } |
| 119 | + }) |
| 120 | + |
| 121 | + // Send answer via HTTP Response |
| 122 | + writeAnswer(w, peerConnection, offer, "/whip") |
| 123 | +} |
| 124 | + |
| 125 | +func whepHandler(w http.ResponseWriter, r *http.Request) { |
| 126 | + // Read the offer from HTTP Request |
| 127 | + offer, err := io.ReadAll(r.Body) |
| 128 | + if err != nil { |
| 129 | + panic(err) |
| 130 | + } |
| 131 | + |
| 132 | + // Create a new RTCPeerConnection |
| 133 | + peerConnection, err := webrtc.NewPeerConnection(peerConnectionConfiguration) |
| 134 | + if err != nil { |
| 135 | + panic(err) |
| 136 | + } |
| 137 | + |
| 138 | + // Add Video Track that is being written to from WHIP Session |
| 139 | + rtpSender, err := peerConnection.AddTrack(videoTrack) |
| 140 | + if err != nil { |
| 141 | + panic(err) |
| 142 | + } |
| 143 | + |
| 144 | + // Read incoming RTCP packets |
| 145 | + // Before these packets are returned they are processed by interceptors. For things |
| 146 | + // like NACK this needs to be called. |
| 147 | + go func() { |
| 148 | + rtcpBuf := make([]byte, 1500) |
| 149 | + for { |
| 150 | + if _, _, rtcpErr := rtpSender.Read(rtcpBuf); rtcpErr != nil { |
| 151 | + return |
| 152 | + } |
| 153 | + } |
| 154 | + }() |
| 155 | + |
| 156 | + // Send answer via HTTP Response |
| 157 | + writeAnswer(w, peerConnection, offer, "/whep") |
| 158 | +} |
| 159 | + |
| 160 | +func writeAnswer(w http.ResponseWriter, peerConnection *webrtc.PeerConnection, offer []byte, path string) { |
| 161 | + // Set the handler for ICE connection state |
| 162 | + // This will notify you when the peer has connected/disconnected |
| 163 | + peerConnection.OnICEConnectionStateChange(func(connectionState webrtc.ICEConnectionState) { |
| 164 | + fmt.Printf("ICE Connection State has changed: %s\n", connectionState.String()) |
| 165 | + |
| 166 | + if connectionState == webrtc.ICEConnectionStateFailed { |
| 167 | + _ = peerConnection.Close() |
| 168 | + } |
| 169 | + }) |
| 170 | + |
| 171 | + if err := peerConnection.SetRemoteDescription(webrtc.SessionDescription{Type: webrtc.SDPTypeOffer, SDP: string(offer)}); err != nil { |
| 172 | + panic(err) |
| 173 | + } |
| 174 | + |
| 175 | + // Create channel that is blocked until ICE Gathering is complete |
| 176 | + gatherComplete := webrtc.GatheringCompletePromise(peerConnection) |
| 177 | + |
| 178 | + // Create answer |
| 179 | + answer, err := peerConnection.CreateAnswer(nil) |
| 180 | + if err != nil { |
| 181 | + panic(err) |
| 182 | + } else if err = peerConnection.SetLocalDescription(answer); err != nil { |
| 183 | + panic(err) |
| 184 | + } |
| 185 | + |
| 186 | + // Block until ICE Gathering is complete, disabling trickle ICE |
| 187 | + // we do this because we only can exchange one signaling message |
| 188 | + // in a production application you should exchange ICE Candidates via OnICECandidate |
| 189 | + <-gatherComplete |
| 190 | + |
| 191 | + // WHIP+WHEP expects a Location header and a HTTP Status Code of 201 |
| 192 | + w.Header().Add("Location", path) |
| 193 | + w.WriteHeader(http.StatusCreated) |
| 194 | + |
| 195 | + // Write Answer with Candidates as HTTP Response |
| 196 | + fmt.Fprint(w, peerConnection.LocalDescription().SDP) |
| 197 | +} |
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