neko/internal/webrtc/webrtc.go

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package webrtc
import (
"fmt"
"io"
"math/rand"
"strings"
"github.com/pion/webrtc/v2"
"github.com/pion/webrtc/v2/pkg/media"
"github.com/rs/zerolog"
"github.com/rs/zerolog/log"
"n.eko.moe/neko/internal/types"
"n.eko.moe/neko/internal/types/config"
)
func New(sessions types.SessionManager, remote types.RemoteManager, config *config.WebRTC) *WebRTCManager {
return &WebRTCManager{
logger: log.With().Str("module", "webrtc").Logger(),
remote: remote,
sessions: sessions,
config: config,
}
}
type WebRTCManager struct {
logger zerolog.Logger
videoTrack *webrtc.Track
audioTrack *webrtc.Track
videoCodec *webrtc.RTPCodec
audioCodec *webrtc.RTPCodec
sessions types.SessionManager
remote types.RemoteManager
config *config.WebRTC
}
func (manager *WebRTCManager) Start() {
var err error
manager.audioTrack, manager.audioCodec, err = manager.createTrack(manager.remote.AudioCodec())
if err != nil {
manager.logger.Panic().Err(err).Msg("unable to create audio track")
}
manager.remote.OnAudioFrame(func(sample types.Sample) {
if err := manager.audioTrack.WriteSample(media.Sample(sample)); err != nil && err != io.ErrClosedPipe {
manager.logger.Warn().Err(err).Msg("audio pipeline failed to write")
}
})
manager.videoTrack, manager.videoCodec, err = manager.createTrack(manager.remote.VideoCodec())
if err != nil {
manager.logger.Panic().Err(err).Msg("unable to create video track")
}
manager.remote.OnVideoFrame(func(sample types.Sample) {
if err := manager.videoTrack.WriteSample(media.Sample(sample)); err != nil && err != io.ErrClosedPipe {
manager.logger.Warn().Err(err).Msg("video pipeline failed to write")
}
})
manager.logger.Info().
Str("ice_lite", fmt.Sprintf("%t", manager.config.ICELite)).
Str("ice_servers", strings.Join(manager.config.ICEServers, ",")).
Str("ephemeral_port_range", fmt.Sprintf("%d-%d", manager.config.EphemeralMin, manager.config.EphemeralMax)).
Str("nat_ips", strings.Join(manager.config.NAT1To1IPs, ",")).
Msgf("webrtc starting")
}
func (manager *WebRTCManager) Shutdown() error {
manager.logger.Info().Msgf("webrtc shutting down")
return nil
}
func (manager *WebRTCManager) CreatePeer(id string, session types.Session) (string, bool, []string, error) {
configuration := &webrtc.Configuration{
ICEServers: []webrtc.ICEServer{
{
URLs: manager.config.ICEServers,
},
},
SDPSemantics: webrtc.SDPSemanticsUnifiedPlanWithFallback,
}
settings := webrtc.SettingEngine{
LoggerFactory: loggerFactory{
logger: manager.logger,
},
}
if manager.config.ICELite {
configuration = &webrtc.Configuration{
SDPSemantics: webrtc.SDPSemanticsUnifiedPlanWithFallback,
}
settings.SetLite(true)
}
settings.SetEphemeralUDPPortRange(manager.config.EphemeralMin, manager.config.EphemeralMax)
settings.SetNAT1To1IPs(manager.config.NAT1To1IPs, webrtc.ICECandidateTypeHost)
// Create MediaEngine based off sdp
engine := webrtc.MediaEngine{}
engine.RegisterCodec(manager.audioCodec)
engine.RegisterCodec(manager.videoCodec)
// Create API with MediaEngine and SettingEngine
api := webrtc.NewAPI(webrtc.WithMediaEngine(engine), webrtc.WithSettingEngine(settings))
// Create new peer connection
connection, err := api.NewPeerConnection(*configuration)
if err != nil {
return "", manager.config.ICELite, manager.config.ICEServers, err
}
if _, err = connection.AddTransceiverFromTrack(manager.videoTrack, webrtc.RtpTransceiverInit{
Direction: webrtc.RTPTransceiverDirectionSendonly,
}); err != nil {
return "", manager.config.ICELite, manager.config.ICEServers, err
}
if _, err = connection.AddTransceiverFromTrack(manager.audioTrack, webrtc.RtpTransceiverInit{
Direction: webrtc.RTPTransceiverDirectionSendonly,
}); err != nil {
return "", manager.config.ICELite, manager.config.ICEServers, err
}
description, err := connection.CreateOffer(nil)
if err != nil {
return "", manager.config.ICELite, manager.config.ICEServers, err
}
connection.OnDataChannel(func(d *webrtc.DataChannel) {
d.OnMessage(func(msg webrtc.DataChannelMessage) {
if err = manager.handle(id, msg); err != nil {
manager.logger.Warn().Err(err).Msg("data handle failed")
}
})
})
connection.SetLocalDescription(description)
connection.OnConnectionStateChange(func(state webrtc.PeerConnectionState) {
switch state {
case webrtc.PeerConnectionStateDisconnected:
case webrtc.PeerConnectionStateFailed:
manager.logger.Info().Str("id", id).Msg("peer disconnected")
manager.sessions.Destroy(id)
break
case webrtc.PeerConnectionStateConnected:
manager.logger.Info().Str("id", id).Msg("peer connected")
if err = session.SetConnected(true); err != nil {
manager.logger.Warn().Err(err).Msg("unable to set connected on peer")
manager.sessions.Destroy(id)
}
break
}
})
if err := session.SetPeer(&Peer{
id: id,
api: api,
engine: &engine,
manager: manager,
settings: &settings,
connection: connection,
configuration: configuration,
}); err != nil {
return "", manager.config.ICELite, manager.config.ICEServers, err
}
return description.SDP, manager.config.ICELite, manager.config.ICEServers, nil
}
func (m *WebRTCManager) createTrack(codecName string) (*webrtc.Track, *webrtc.RTPCodec, error) {
var codec *webrtc.RTPCodec
switch codecName {
case webrtc.VP8:
codec = webrtc.NewRTPVP8Codec(webrtc.DefaultPayloadTypeVP8, 90000)
case webrtc.VP9:
codec = webrtc.NewRTPVP9Codec(webrtc.DefaultPayloadTypeVP9, 90000)
case webrtc.H264:
codec = webrtc.NewRTPH264Codec(webrtc.DefaultPayloadTypeH264, 90000)
case webrtc.Opus:
codec = webrtc.NewRTPOpusCodec(webrtc.DefaultPayloadTypeOpus, 48000)
case webrtc.G722:
codec = webrtc.NewRTPG722Codec(webrtc.DefaultPayloadTypeG722, 8000)
case webrtc.PCMU:
codec = webrtc.NewRTPPCMUCodec(webrtc.DefaultPayloadTypePCMU, 8000)
case webrtc.PCMA:
codec = webrtc.NewRTPPCMACodec(webrtc.DefaultPayloadTypePCMA, 8000)
default:
return nil, nil, fmt.Errorf("unknown codec %s", codecName)
}
track, err := webrtc.NewTrack(codec.PayloadType, rand.Uint32(), "stream", "stream", codec)
if err != nil {
return nil, nil, err
}
return track, codec, nil
}