mirror of
https://github.com/pion/webrtc.git
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146 lines
3.4 KiB
Go
146 lines
3.4 KiB
Go
// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
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// SPDX-License-Identifier: MIT
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//go:build !js
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// +build !js
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// rtcp-processing demonstrates the Public API for processing RTCP packets in Pion WebRTC.
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package main
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import (
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"bufio"
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"encoding/base64"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"os"
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"strings"
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"github.com/pion/webrtc/v4"
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)
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func main() {
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// Everything below is the Pion WebRTC API! Thanks for using it ❤️.
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// Prepare the configuration
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config := webrtc.Configuration{
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ICEServers: []webrtc.ICEServer{
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{
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URLs: []string{"stun:stun.l.google.com:19302"},
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},
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},
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}
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// Create a new RTCPeerConnection
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peerConnection, err := webrtc.NewPeerConnection(config)
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if err != nil {
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panic(err)
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}
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// Set a handler for when a new remote track starts
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peerConnection.OnTrack(func(track *webrtc.TrackRemote, receiver *webrtc.RTPReceiver) {
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fmt.Printf("Track has started streamId(%s) id(%s) rid(%s) \n", track.StreamID(), track.ID(), track.RID())
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for {
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// Read the RTCP packets as they become available for our new remote track
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rtcpPackets, _, rtcpErr := receiver.ReadRTCP()
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if rtcpErr != nil {
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panic(rtcpErr)
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}
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for _, r := range rtcpPackets {
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// Print a string description of the packets
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if stringer, canString := r.(fmt.Stringer); canString {
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fmt.Printf("Received RTCP Packet: %v", stringer.String())
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}
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}
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}
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})
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// Set the handler for ICE connection state
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// This will notify you when the peer has connected/disconnected
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peerConnection.OnICEConnectionStateChange(func(connectionState webrtc.ICEConnectionState) {
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fmt.Printf("Connection State has changed %s \n", connectionState.String())
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})
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// Wait for the offer to be pasted
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offer := webrtc.SessionDescription{}
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decode(readUntilNewline(), &offer)
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// Set the remote SessionDescription
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err = peerConnection.SetRemoteDescription(offer)
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if err != nil {
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panic(err)
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}
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// Create answer
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answer, err := peerConnection.CreateAnswer(nil)
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if err != nil {
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panic(err)
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}
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// Create channel that is blocked until ICE Gathering is complete
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gatherComplete := webrtc.GatheringCompletePromise(peerConnection)
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// Sets the LocalDescription, and starts our UDP listeners
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err = peerConnection.SetLocalDescription(answer)
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if err != nil {
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panic(err)
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}
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// Block until ICE Gathering is complete, disabling trickle ICE
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// we do this because we only can exchange one signaling message
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// in a production application you should exchange ICE Candidates via OnICECandidate
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<-gatherComplete
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// Output the answer in base64 so we can paste it in browser
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fmt.Println(encode(peerConnection.LocalDescription()))
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// Block forever
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select {}
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}
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// Read from stdin until we get a newline.
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func readUntilNewline() (in string) {
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var err error
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r := bufio.NewReader(os.Stdin)
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for {
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in, err = r.ReadString('\n')
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if err != nil && !errors.Is(err, io.EOF) {
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panic(err)
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}
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if in = strings.TrimSpace(in); len(in) > 0 {
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break
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}
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}
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fmt.Println("")
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return
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}
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// JSON encode + base64 a SessionDescription.
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func encode(obj *webrtc.SessionDescription) string {
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b, err := json.Marshal(obj)
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if err != nil {
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panic(err)
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}
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return base64.StdEncoding.EncodeToString(b)
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}
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// Decode a base64 and unmarshal JSON into a SessionDescription.
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func decode(in string, obj *webrtc.SessionDescription) {
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b, err := base64.StdEncoding.DecodeString(in)
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if err != nil {
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panic(err)
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}
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if err = json.Unmarshal(b, obj); err != nil {
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panic(err)
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}
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}
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