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neko-custom/server/internal/webrtc/webrtc.go
2020-02-12 23:13:33 +00:00

268 lines
7.0 KiB
Go

package webrtc
import (
"fmt"
"io"
"strings"
"time"
"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/gst"
"n.eko.moe/neko/internal/types"
"n.eko.moe/neko/internal/types/config"
"n.eko.moe/neko/internal/xorg"
)
func New(sessions types.SessionManager, config *config.WebRTC) *WebRTCManager {
logger := log.With().Str("module", "webrtc").Logger()
settings := webrtc.SettingEngine{
LoggerFactory: loggerFactory{
logger: logger,
},
}
settings.SetLite(true)
settings.SetNetworkTypes([]webrtc.NetworkType{webrtc.NetworkTypeUDP4})
settings.SetEphemeralUDPPortRange(config.EphemeralMin, config.EphemeralMax)
settings.SetNAT1To1IPs(config.NAT1To1IPs, webrtc.ICECandidateTypeHost)
// Create MediaEngine based off sdp
engine := webrtc.MediaEngine{}
engine.RegisterDefaultCodecs()
// Create API with MediaEngine and SettingEngine
api := webrtc.NewAPI(webrtc.WithMediaEngine(engine), webrtc.WithSettingEngine(settings))
return &WebRTCManager{
logger: logger,
settings: settings,
cleanup: time.NewTicker(1 * time.Second),
shutdown: make(chan bool),
sessions: sessions,
engine: engine,
config: config,
api: api,
configuration: &webrtc.Configuration{
SDPSemantics: webrtc.SDPSemanticsUnifiedPlanWithFallback,
},
}
}
type WebRTCManager struct {
logger zerolog.Logger
settings webrtc.SettingEngine
engine webrtc.MediaEngine
api *webrtc.API
videoTrack *webrtc.Track
audioTrack *webrtc.Track
videoPipeline *gst.Pipeline
audioPipeline *gst.Pipeline
sessions types.SessionManager
cleanup *time.Ticker
config *config.WebRTC
shutdown chan bool
configuration *webrtc.Configuration
}
func (m *WebRTCManager) Start() {
// Set display and change to default resolution
xorg.Display(m.config.Display)
if !xorg.ValidScreenSize(m.config.ScreenWidth, m.config.ScreenHeight, m.config.ScreenRate) {
m.logger.Warn().Msgf("invalid screen option %dx%d@%d", m.config.ScreenWidth, m.config.ScreenHeight, m.config.ScreenRate)
} else {
if err := xorg.ChangeScreenSize(m.config.ScreenWidth, m.config.ScreenHeight, m.config.ScreenRate); err != nil {
m.logger.Warn().Err(err).Msg("unable to change screen size")
}
}
// Create video track/pipeline
videoPipeline, err := gst.CreatePipeline(
m.config.VideoCodec,
m.config.Display,
m.config.VideoParams,
)
if err != nil {
m.logger.Panic().Err(err).Msg("unable to start webrtc manager")
}
m.videoPipeline = videoPipeline
video, err := m.createVideoTrack()
if err != nil {
m.logger.Panic().Err(err).Msg("unable to start webrtc manager")
}
m.videoTrack = video
// Create audio track/pipeline
audioPipeline, err := gst.CreatePipeline(
m.config.AudioCodec,
m.config.Device,
m.config.AudioParams,
)
if err != nil {
m.logger.Panic().Err(err).Msg("unable to start webrtc manager")
}
m.audioPipeline = audioPipeline
audio, err := m.createAudioTrack()
if err != nil {
m.logger.Panic().Err(err).Msg("unable to start webrtc manager")
}
m.audioTrack = audio
go func() {
defer func() {
m.logger.Info().Msg("shutdown")
}()
for {
select {
case <-m.shutdown:
return
case sample := <-m.videoPipeline.Sample:
if err := m.videoTrack.WriteSample(media.Sample(sample)); err != nil && err != io.ErrClosedPipe {
m.logger.Warn().Err(err).Msg("video pipeline failed to write")
}
case sample := <-m.audioPipeline.Sample:
if err := m.audioTrack.WriteSample(media.Sample(sample)); err != nil && err != io.ErrClosedPipe {
m.logger.Warn().Err(err).Msg("audio pipeline failed to write")
}
case <-m.cleanup.C:
xorg.CheckKeys(time.Second * 10)
}
}
}()
m.sessions.OnHostCleared(func(id string) {
xorg.ResetKeys()
})
m.sessions.OnCreated(func(id string, session types.Session) {
m.logger.Debug().Str("id", id).Msg("session created")
})
m.sessions.OnDestroy(func(id string) {
m.logger.Debug().Str("id", id).Msg("session destroyed")
})
// start pipelines
videoPipeline.Start()
audioPipeline.Start()
// TODO: log resolution, bit rate and codec parameters
m.logger.Info().
Str("video_display", m.config.Display).
Str("video_codec", m.config.VideoCodec).
Str("audio_device", m.config.Device).
Str("audio_codec", m.config.AudioCodec).
Str("ephemeral_port_range", fmt.Sprintf("%d-%d", m.config.EphemeralMin, m.config.EphemeralMax)).
Str("nat_ips", strings.Join(m.config.NAT1To1IPs, ",")).
Str("audio_pipeline_src", audioPipeline.Src).
Str("video_pipeline_src", videoPipeline.Src).
Msgf("webrtc streaming")
}
func (m *WebRTCManager) Shutdown() error {
m.logger.Info().Msgf("webrtc shutting down")
m.videoPipeline.Stop()
m.audioPipeline.Stop()
m.cleanup.Stop()
m.shutdown <- true
return nil
}
func (m *WebRTCManager) CreatePeer(id string, session types.Session) (string, error) {
// Create new peer connection
connection, err := m.api.NewPeerConnection(*m.configuration)
if err != nil {
return "", err
}
if _, err = connection.AddTransceiverFromTrack(m.videoTrack, webrtc.RtpTransceiverInit{
Direction: webrtc.RTPTransceiverDirectionSendonly,
}); err != nil {
return "", err
}
if _, err = connection.AddTransceiverFromTrack(m.audioTrack, webrtc.RtpTransceiverInit{
Direction: webrtc.RTPTransceiverDirectionSendonly,
}); err != nil {
return "", err
}
description, err := connection.CreateOffer(nil)
if err != nil {
return "", err
}
connection.OnDataChannel(func(d *webrtc.DataChannel) {
d.OnMessage(func(msg webrtc.DataChannelMessage) {
if err = m.handle(id, msg); err != nil {
m.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:
m.logger.Info().Str("id", id).Msg("peer disconnected")
m.sessions.Destroy(id)
break
case webrtc.PeerConnectionStateConnected:
m.logger.Info().Str("id", id).Msg("peer connected")
if err = session.SetConnected(true); err != nil {
m.logger.Warn().Err(err).Msg("unable to set connected on peer")
m.sessions.Destroy(id)
}
break
}
})
if err := session.SetPeer(&Peer{
id: id,
manager: m,
connection: connection,
}); err != nil {
return "", err
}
return description.SDP, nil
}
func (m *WebRTCManager) ChangeScreenSize(width int, height int, rate int) error {
if !xorg.ValidScreenSize(width, height, rate) {
return fmt.Errorf("unknown configuration")
}
m.videoPipeline.Stop()
defer func() {
m.videoPipeline.Start()
m.logger.Info().Msg("starting pipeline")
}()
if err := xorg.ChangeScreenSize(width, height, rate); err != nil {
return err
}
videoPipeline, err := gst.CreatePipeline(
m.config.VideoCodec,
m.config.Display,
m.config.VideoParams,
)
if err != nil {
m.logger.Panic().Err(err).Msg("unable to create new video pipeline")
}
m.videoPipeline = videoPipeline
return nil
}