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webrtc.go
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webrtc.go
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package lib
import (
"bufio"
"context"
"encoding/json"
"fmt"
"net"
"os/exec"
"time"
"github.com/pion/rtcp"
"github.com/pion/webrtc/v3"
)
type udpConn struct {
conn *net.UDPConn
port int
}
// CreateWebRTCConnection function
func CreateWebRTCConnection(ingestionAddress, streamKey, offerStr string) (answer webrtc.SessionDescription, err error) {
defer func() {
if e, ok := recover().(error); ok {
err = e
}
}()
// Create a MediaEngine object to configure the supported codec
m := webrtc.MediaEngine{}
// Setup the codecs you want to use.
m.RegisterCodec(webrtc.NewRTPOpusCodec(webrtc.DefaultPayloadTypeOpus, 48000))
m.RegisterCodec(webrtc.NewRTPH264Codec(webrtc.DefaultPayloadTypeH264, 90000))
// Create the API object with the MediaEngine
api := webrtc.NewAPI(webrtc.WithMediaEngine(m))
// 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 := api.NewPeerConnection(config)
if err != nil {
panic(err)
}
// Allow us to receive 1 audio track, and 1 video track
if _, err = peerConnection.AddTransceiverFromKind(webrtc.RTPCodecTypeAudio); err != nil {
panic(err)
} else if _, err = peerConnection.AddTransceiverFromKind(webrtc.RTPCodecTypeVideo); err != nil {
panic(err)
}
go func(peerConnection *webrtc.PeerConnection) {
// Create context
ctx, cancel := context.WithCancel(context.Background())
// Create a local addr
var laddr *net.UDPAddr
if laddr, err = net.ResolveUDPAddr("udp", "127.0.0.1:"); err != nil {
fmt.Println(err)
cancel()
}
// Prepare udp conns
udpConns := map[string]*udpConn{
"audio": {port: 4000},
"video": {port: 4002},
}
for _, c := range udpConns {
// Create remote addr
var raddr *net.UDPAddr
if raddr, err = net.ResolveUDPAddr("udp", fmt.Sprintf("127.0.0.1:%d", c.port)); err != nil {
fmt.Println(err)
cancel()
}
// Dial udp
if c.conn, err = net.DialUDP("udp", laddr, raddr); err != nil {
fmt.Println(err)
cancel()
}
defer func(conn net.PacketConn) {
if closeErr := conn.Close(); closeErr != nil {
fmt.Println(closeErr)
}
}(c.conn)
}
streamURL := fmt.Sprintf("%s/%s", ingestionAddress, streamKey)
startFFmpeg(ctx, streamURL)
// Set a handler for when a new remote track starts, this handler will forward data to
// our UDP listeners.
// In your application this is where you would handle/process audio/video
peerConnection.OnTrack(func(track *webrtc.Track, receiver *webrtc.RTPReceiver) {
fmt.Println("on track called")
// Retrieve udp connection
c, ok := udpConns[track.Kind().String()]
if !ok {
return
}
// Send a PLI on an interval so that the publisher is pushing a keyframe every rtcpPLIInterval
go func() {
ticker := time.NewTicker(time.Second * 2)
for range ticker.C {
if rtcpErr := peerConnection.WriteRTCP([]rtcp.Packet{&rtcp.PictureLossIndication{MediaSSRC: track.SSRC()}}); rtcpErr != nil {
fmt.Println(rtcpErr)
}
}
}()
b := make([]byte, 1500)
for {
// Read
n, readErr := track.Read(b)
if readErr != nil {
fmt.Println(readErr)
}
// Write
if _, err = c.conn.Write(b[:n]); err != nil {
fmt.Println(err)
}
}
})
// in a production application you should exchange ICE Candidates via OnICECandidate
peerConnection.OnICECandidate(func(candidate *webrtc.ICECandidate) {
fmt.Println(candidate)
})
// 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())
if connectionState == webrtc.ICEConnectionStateConnected {
fmt.Println("ICE connection was successful")
} else if connectionState == webrtc.ICEConnectionStateFailed ||
connectionState == webrtc.ICEConnectionStateDisconnected {
cancel()
}
})
// Wait for context to be done
<-ctx.Done()
peerConnection.Close()
}(peerConnection)
// Wait for the offer to be pasted
offer := webrtc.SessionDescription{}
err = json.Unmarshal([]byte(offerStr), &offer)
if err != nil {
panic(err)
}
// Set the remote SessionDescription
if err = peerConnection.SetRemoteDescription(offer); err != nil {
panic(err)
}
// Create answer
answer, err = peerConnection.CreateAnswer(nil)
if err != nil {
panic(err)
}
// Sets the LocalDescription, and starts our UDP listeners
if err = peerConnection.SetLocalDescription(answer); err != nil {
panic(err)
}
return
}
func startFFmpeg(ctx context.Context, streamURL string) {
// Create a ffmpeg process that consumes MKV via stdin, and broadcasts out to Stream URL
ffmpeg := exec.CommandContext(ctx, "ffmpeg", "-protocol_whitelist", "file,udp,rtp", "-i", "rtp-forwarder.sdp", "-c:v", "copy", "-c:a", "aac", "-f", "flv", "-strict", "-2", streamURL) //nolint
ffmpeg.StdinPipe()
ffmpegOut, _ := ffmpeg.StderrPipe()
if err := ffmpeg.Start(); err != nil {
panic(err)
}
go func() {
scanner := bufio.NewScanner(ffmpegOut)
for scanner.Scan() {
fmt.Println(scanner.Text())
}
}()
}