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//go:build !js
// +build !js
package main
import (
"fmt"
"github.com/pion/webrtc/v3"
"github.com/pion/webrtc/v3/examples/internal/signal"
)
func main() {
// Everything below is the Pion WebRTC API! Thanks for using it ❤️.
// Prepare the configuration
config := webrtc.Configuration{
ICEServers: []webrtc.ICEServer{
{
URLs: []string{"stun:stun.l.google.com:19302"},
},
},
}
// Create a new RTCPeerConnection
peerConnection, err := webrtc.NewPeerConnection(config)
if err != nil {
panic(err)
}
// Set a handler for when a new remote track starts
peerConnection.OnTrack(func(track *webrtc.TrackRemote, receiver *webrtc.RTPReceiver) {
fmt.Printf("Track has started streamId(%s) id(%s) rid(%s) \n", track.StreamID(), track.ID(), track.RID())
for {
// Read the RTCP packets as they become available for our new remote track
rtcpPackets, _, rtcpErr := receiver.ReadRTCP()
if rtcpErr != nil {
panic(rtcpErr)
}
for _, r := range rtcpPackets {
// Print a string description of the packets
if stringer, canString := r.(fmt.Stringer); canString {
fmt.Printf("Received RTCP Packet: %v", stringer.String())
}
}
}
})
// Set the handler for ICE connection state
// This will notify you when the peer has connected/disconnected
peerConnection.OnICEConnectionStateChange(func(connectionState webrtc.ICEConnectionState) {
fmt.Printf("Connection State has changed %s \n", connectionState.String())
})
// Wait for the offer to be pasted
offer := webrtc.SessionDescription{}
signal.Decode(signal.MustReadStdin(), &offer)
// Set the remote SessionDescription
err = peerConnection.SetRemoteDescription(offer)
if err != nil {
panic(err)
}
// Create answer
answer, err := peerConnection.CreateAnswer(nil)
if err != nil {
panic(err)
}
// Create channel that is blocked until ICE Gathering is complete
gatherComplete := webrtc.GatheringCompletePromise(peerConnection)
// Sets the LocalDescription, and starts our UDP listeners
err = peerConnection.SetLocalDescription(answer)
if err != nil {
panic(err)
}
// Block until ICE Gathering is complete, disabling trickle ICE
// we do this because we only can exchange one signaling message
// in a production application you should exchange ICE Candidates via OnICECandidate
<-gatherComplete
// Output the answer in base64 so we can paste it in browser
fmt.Println(signal.Encode(*peerConnection.LocalDescription()))
// Block forever
select {}
}
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