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main.go
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main.go
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package main
import (
"fmt"
"github.com/pion/mediadevices"
"github.com/pion/mediadevices/examples/internal/signal"
"github.com/pion/mediadevices/pkg/frame"
"github.com/pion/mediadevices/pkg/prop"
"github.com/pion/webrtc/v3"
// If you don't like x264, you can also use vpx by importing as below
// "github.com/pion/mediadevices/pkg/codec/vpx" // This is required to use VP8/VP9 video encoder
// or you can also use openh264 for alternative h264 implementation
// "github.com/pion/mediadevices/pkg/codec/openh264"
// or if you use a raspberry pi like, you can use mmal for using its hardware encoder
// "github.com/pion/mediadevices/pkg/codec/mmal"
"github.com/pion/mediadevices/pkg/codec/opus" // This is required to use opus audio encoder
"github.com/pion/mediadevices/pkg/codec/x264" // This is required to use h264 video encoder
// Note: If you don't have a camera or microphone or your adapters are not supported,
// you can always swap your adapters with our dummy adapters below.
// _ "github.com/pion/mediadevices/pkg/driver/videotest"
// _ "github.com/pion/mediadevices/pkg/driver/audiotest"
_ "github.com/pion/mediadevices/pkg/driver/camera" // This is required to register camera adapter
_ "github.com/pion/mediadevices/pkg/driver/microphone" // This is required to register microphone adapter
)
func main() {
config := webrtc.Configuration{
ICEServers: []webrtc.ICEServer{
{
URLs: []string{"stun:stun.l.google.com:19302"},
},
},
}
// Wait for the offer to be pasted
offer := webrtc.SessionDescription{}
signal.Decode(signal.MustReadStdin(), &offer)
// Create a new RTCPeerConnection
x264Params, err := x264.NewParams()
if err != nil {
panic(err)
}
x264Params.BitRate = 500_000 // 500kbps
opusParams, err := opus.NewParams()
if err != nil {
panic(err)
}
codecSelector := mediadevices.NewCodecSelector(
mediadevices.WithVideoEncoders(&x264Params),
mediadevices.WithAudioEncoders(&opusParams),
)
mediaEngine := webrtc.MediaEngine{}
codecSelector.Populate(&mediaEngine)
api := webrtc.NewAPI(webrtc.WithMediaEngine(&mediaEngine))
peerConnection, err := api.NewPeerConnection(config)
if err != nil {
panic(err)
}
// 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())
})
s, err := mediadevices.GetUserMedia(mediadevices.MediaStreamConstraints{
Video: func(c *mediadevices.MediaTrackConstraints) {
c.FrameFormat = prop.FrameFormat(frame.FormatI420)
c.Width = prop.Int(640)
c.Height = prop.Int(480)
},
Audio: func(c *mediadevices.MediaTrackConstraints) {
},
Codec: codecSelector,
})
if err != nil {
panic(err)
}
for _, track := range s.GetTracks() {
track.OnEnded(func(err error) {
fmt.Printf("Track (ID: %s) ended with error: %v\n",
track.ID(), err)
})
_, err = peerConnection.AddTransceiverFromTrack(track,
webrtc.RtpTransceiverInit{
Direction: webrtc.RTPTransceiverDirectionSendonly,
},
)
if err != nil {
panic(err)
}
}
// Set the remote SessionDescription
err = peerConnection.SetRemoteDescription(offer)
if err != nil {
panic(err)
}
// Create an 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 {}
}