mirror of
https://github.com/m1k1o/neko.git
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585 lines
15 KiB
Go
585 lines
15 KiB
Go
package webrtc
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import (
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"fmt"
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"net"
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"strings"
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"sync"
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"sync/atomic"
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"time"
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"github.com/pion/ice/v2"
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"github.com/pion/interceptor"
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"github.com/pion/interceptor/pkg/cc"
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"github.com/pion/interceptor/pkg/gcc"
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"github.com/pion/rtcp"
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"github.com/pion/webrtc/v3"
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"github.com/rs/zerolog"
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"github.com/rs/zerolog/log"
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"github.com/demodesk/neko/internal/config"
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"github.com/demodesk/neko/internal/webrtc/cursor"
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"github.com/demodesk/neko/internal/webrtc/pionlog"
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"github.com/demodesk/neko/pkg/types"
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"github.com/demodesk/neko/pkg/types/codec"
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"github.com/demodesk/neko/pkg/types/event"
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"github.com/demodesk/neko/pkg/types/message"
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)
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const (
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// size of receiving channel used to buffer incoming TCP packets
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tcpReadChanBufferSize = 50
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// size of buffer used to buffer outgoing TCP packets. Default is 4MB
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tcpWriteBufferSizeInBytes = 4 * 1024 * 1024
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// the duration without network activity before a Agent is considered disconnected. Default is 5 Seconds
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disconnectedTimeout = 4 * time.Second
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// the duration without network activity before a Agent is considered failed after disconnected. Default is 25 Seconds
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failedTimeout = 6 * time.Second
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// how often the ICE Agent sends extra traffic if there is no activity, if media is flowing no traffic will be sent. Default is 2 seconds
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keepAliveInterval = 2 * time.Second
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// send a PLI on an interval so that the publisher is pushing a keyframe every rtcpPLIInterval
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rtcpPLIInterval = 3 * time.Second
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)
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func New(desktop types.DesktopManager, capture types.CaptureManager, config *config.WebRTC) *WebRTCManagerCtx {
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logger := log.With().Str("module", "webrtc").Logger()
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configuration := webrtc.Configuration{
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SDPSemantics: webrtc.SDPSemanticsUnifiedPlan,
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}
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if !config.ICELite {
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ICEServers := []webrtc.ICEServer{}
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for _, server := range config.ICEServersBackend {
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var credential any
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if server.Credential != "" {
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credential = server.Credential
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} else {
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credential = false
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}
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ICEServers = append(ICEServers, webrtc.ICEServer{
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URLs: server.URLs,
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Username: server.Username,
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Credential: credential,
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})
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}
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configuration.ICEServers = ICEServers
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}
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return &WebRTCManagerCtx{
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logger: logger,
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config: config,
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metrics: newMetricsManager(),
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webrtcConfiguration: configuration,
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desktop: desktop,
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capture: capture,
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curImage: cursor.NewImage(logger, desktop),
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curPosition: cursor.NewPosition(logger),
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}
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}
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type WebRTCManagerCtx struct {
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logger zerolog.Logger
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config *config.WebRTC
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metrics *metricsManager
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peerId int32
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desktop types.DesktopManager
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capture types.CaptureManager
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curImage cursor.Image
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curPosition cursor.Position
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webrtcConfiguration webrtc.Configuration
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tcpMux ice.TCPMux
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udpMux ice.UDPMux
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camStop, micStop *func()
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}
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func (manager *WebRTCManagerCtx) Start() {
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manager.curImage.Start()
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logger := pionlog.New(manager.logger)
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// add TCP Mux listener
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if manager.config.TCPMux > 0 {
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tcpListener, err := net.ListenTCP("tcp", &net.TCPAddr{
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IP: net.IP{0, 0, 0, 0},
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Port: manager.config.TCPMux,
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})
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if err != nil {
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manager.logger.Fatal().Err(err).Msg("unable to setup ice TCP mux")
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}
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manager.tcpMux = ice.NewTCPMuxDefault(ice.TCPMuxParams{
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Listener: tcpListener,
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Logger: logger.NewLogger("ice-tcp"),
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ReadBufferSize: tcpReadChanBufferSize,
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WriteBufferSize: tcpWriteBufferSizeInBytes,
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})
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}
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// add UDP Mux listener
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if manager.config.UDPMux > 0 {
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var err error
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manager.udpMux, err = ice.NewMultiUDPMuxFromPort(manager.config.UDPMux,
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ice.UDPMuxFromPortWithLogger(logger.NewLogger("ice-udp")),
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)
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if err != nil {
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manager.logger.Fatal().Err(err).Msg("unable to setup ice UDP mux")
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}
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}
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manager.logger.Info().
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Bool("icelite", manager.config.ICELite).
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Bool("icetrickle", manager.config.ICETrickle).
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Interface("iceservers-frontend", manager.config.ICEServersFrontend).
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Interface("iceservers-backend", manager.config.ICEServersBackend).
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Str("nat1to1", strings.Join(manager.config.NAT1To1IPs, ",")).
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Str("epr", fmt.Sprintf("%d-%d", manager.config.EphemeralMin, manager.config.EphemeralMax)).
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Int("tcpmux", manager.config.TCPMux).
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Int("udpmux", manager.config.UDPMux).
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Msg("webrtc starting")
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}
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func (manager *WebRTCManagerCtx) Shutdown() error {
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manager.logger.Info().Msg("shutdown")
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manager.curImage.Shutdown()
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manager.curPosition.Shutdown()
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return nil
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}
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func (manager *WebRTCManagerCtx) ICEServers() []types.ICEServer {
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return manager.config.ICEServersFrontend
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}
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func (manager *WebRTCManagerCtx) newPeerConnection(logger zerolog.Logger, codecs []codec.RTPCodec, bitrate int) (*webrtc.PeerConnection, cc.BandwidthEstimator, error) {
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// create media engine
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engine := &webrtc.MediaEngine{}
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for _, codec := range codecs {
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if err := codec.Register(engine); err != nil {
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return nil, nil, err
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}
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}
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// create setting engine
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settings := webrtc.SettingEngine{
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LoggerFactory: pionlog.New(logger),
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}
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settings.DisableMediaEngineCopy(true)
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settings.SetICETimeouts(disconnectedTimeout, failedTimeout, keepAliveInterval)
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settings.SetNAT1To1IPs(manager.config.NAT1To1IPs, webrtc.ICECandidateTypeHost)
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settings.SetLite(manager.config.ICELite)
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// make sure server answer sdp setup as passive, to not force DTLS renegotiation
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// otherwise iOS renegotiation fails with: Failed to set SSL role for the transport.
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settings.SetAnsweringDTLSRole(webrtc.DTLSRoleServer)
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var networkType []webrtc.NetworkType
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// udp candidates
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if manager.udpMux != nil {
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settings.SetICEUDPMux(manager.udpMux)
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networkType = append(networkType,
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webrtc.NetworkTypeUDP4,
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webrtc.NetworkTypeUDP6,
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)
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} else if manager.config.EphemeralMax != 0 {
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_ = settings.SetEphemeralUDPPortRange(manager.config.EphemeralMin, manager.config.EphemeralMax)
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networkType = append(networkType,
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webrtc.NetworkTypeUDP4,
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webrtc.NetworkTypeUDP6,
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)
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}
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// tcp candidates
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if manager.tcpMux != nil {
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settings.SetICETCPMux(manager.tcpMux)
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networkType = append(networkType,
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webrtc.NetworkTypeTCP4,
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webrtc.NetworkTypeTCP6,
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)
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}
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// enable support for TCP and UDP ICE candidates
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settings.SetNetworkTypes(networkType)
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// create interceptor registry
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registry := &interceptor.Registry{}
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// create bandwidth estimator
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estimatorChan := make(chan cc.BandwidthEstimator, 1)
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if manager.config.EstimatorEnabled {
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congestionController, err := cc.NewInterceptor(func() (cc.BandwidthEstimator, error) {
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if bitrate == 0 {
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bitrate = manager.config.EstimatorInitialBitrate
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}
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return gcc.NewSendSideBWE(
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gcc.SendSideBWEInitialBitrate(bitrate),
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gcc.SendSideBWEPacer(gcc.NewNoOpPacer()),
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)
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})
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if err != nil {
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return nil, nil, err
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}
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congestionController.OnNewPeerConnection(func(id string, estimator cc.BandwidthEstimator) {
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estimatorChan <- estimator
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})
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registry.Add(congestionController)
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if err = webrtc.ConfigureTWCCHeaderExtensionSender(engine, registry); err != nil {
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return nil, nil, err
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}
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} else {
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// no estimator, send nil
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estimatorChan <- nil
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}
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if err := webrtc.RegisterDefaultInterceptors(engine, registry); err != nil {
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return nil, nil, err
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}
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// create new API
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api := webrtc.NewAPI(
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webrtc.WithMediaEngine(engine),
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webrtc.WithSettingEngine(settings),
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webrtc.WithInterceptorRegistry(registry),
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)
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// create new peer connection
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configuration := manager.webrtcConfiguration
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connection, err := api.NewPeerConnection(configuration)
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return connection, <-estimatorChan, err
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}
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func (manager *WebRTCManagerCtx) CreatePeer(session types.Session, bitrate int, videoAuto bool) (*webrtc.SessionDescription, error) {
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id := atomic.AddInt32(&manager.peerId, 1)
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// get metrics for session
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metrics := manager.metrics.getBySession(session)
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metrics.NewConnection()
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// add session id to logger context
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logger := manager.logger.With().Str("session_id", session.ID()).Int32("peer_id", id).Logger()
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logger.Info().Msg("creating webrtc peer")
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// all audios must have the same codec
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audio := manager.capture.Audio()
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audioCodec := audio.Codec()
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// all videos must have the same codec
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video := manager.capture.Video()
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videoCodec := video.Codec()
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connection, estimator, err := manager.newPeerConnection(logger, []codec.RTPCodec{
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audioCodec,
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videoCodec,
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}, bitrate)
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if err != nil {
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return nil, err
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}
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// asynchronously send local ICE Candidates
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if manager.config.ICETrickle {
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connection.OnICECandidate(func(candidate *webrtc.ICECandidate) {
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if candidate == nil {
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logger.Debug().Msg("all local ice candidates sent")
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return
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}
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session.Send(
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event.SIGNAL_CANDIDATE,
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message.SignalCandidate{
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ICECandidateInit: candidate.ToJSON(),
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})
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})
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}
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// if bitrate is 0, and estimator is enabled, use estimator bitrate
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if bitrate == 0 && estimator != nil {
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bitrate = estimator.GetTargetBitrate()
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}
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// audio track
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audioTrack, err := NewTrack(logger, audioCodec, connection)
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if err != nil {
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return nil, err
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}
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// set stream for audio track
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_, err = audioTrack.SetStream(audio)
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if err != nil {
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return nil, err
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}
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// if estimator is disabled, or in passive mode, disable video auto bitrate
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if !manager.config.EstimatorEnabled || manager.config.EstimatorPassive {
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videoAuto = false
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}
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videoRtcp := make(chan []rtcp.Packet, 1)
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// video track
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videoTrack, err := NewTrack(logger, videoCodec, connection,
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WithVideoAuto(videoAuto),
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WithRtcpChan(videoRtcp),
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)
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if err != nil {
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return nil, err
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}
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// let video stream bucket manager handle stream subscriptions
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video.SetReceiver(videoTrack)
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// data channel
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dataChannel, err := connection.CreateDataChannel("data", nil)
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if err != nil {
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return nil, err
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}
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peer := &WebRTCPeerCtx{
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logger: logger,
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session: session,
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metrics: metrics,
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connection: connection,
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estimator: estimator,
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// tracks & channels
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audioTrack: audioTrack,
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videoTrack: videoTrack,
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dataChannel: dataChannel,
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rtcpChannel: videoRtcp,
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// config
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iceTrickle: manager.config.ICETrickle,
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estimatorPassive: manager.config.EstimatorPassive,
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}
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logger.Info().
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Int("target_bitrate", bitrate).
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Msg("estimated initial peer bitrate")
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// set initial video bitrate
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if err := peer.SetVideoBitrate(bitrate); err != nil {
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return nil, err
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}
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connection.OnTrack(func(track *webrtc.TrackRemote, receiver *webrtc.RTPReceiver) {
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logger := logger.With().
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Str("kind", track.Kind().String()).
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Str("mime", track.Codec().RTPCodecCapability.MimeType).
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Logger()
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logger.Info().Msgf("received new remote track")
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if !session.Profile().CanShareMedia {
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err := receiver.Stop()
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logger.Warn().Err(err).Msg("media sharing is disabled for this session")
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return
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}
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// parse codec from remote track
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codec, ok := codec.ParseRTC(track.Codec())
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if !ok {
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err := receiver.Stop()
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logger.Warn().Err(err).Msg("remote track with unknown codec")
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return
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}
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var srcManager types.StreamSrcManager
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stopped := false
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stopFn := func() {
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if stopped {
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return
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}
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stopped = true
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err := receiver.Stop()
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srcManager.Stop()
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logger.Err(err).Msg("remote track stopped")
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}
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if track.Kind() == webrtc.RTPCodecTypeAudio {
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// audio -> microphone
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srcManager = manager.capture.Microphone()
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defer stopFn()
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if manager.micStop != nil {
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(*manager.micStop)()
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}
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manager.micStop = &stopFn
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} else if track.Kind() == webrtc.RTPCodecTypeVideo {
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// video -> webcam
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srcManager = manager.capture.Webcam()
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defer stopFn()
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if manager.camStop != nil {
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(*manager.camStop)()
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}
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manager.camStop = &stopFn
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} else {
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err := receiver.Stop()
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logger.Warn().Err(err).Msg("remote track with unsupported codec type")
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return
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}
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err := srcManager.Start(codec)
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if err != nil {
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logger.Err(err).Msg("failed to start pipeline")
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return
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}
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ticker := time.NewTicker(rtcpPLIInterval)
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defer ticker.Stop()
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go func() {
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for range ticker.C {
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err := connection.WriteRTCP([]rtcp.Packet{
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&rtcp.PictureLossIndication{
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MediaSSRC: uint32(track.SSRC()),
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},
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})
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if err != nil {
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logger.Err(err).Msg("remote track rtcp send err")
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}
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}
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}()
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buf := make([]byte, 1400)
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for {
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i, _, err := track.Read(buf)
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if err != nil {
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logger.Warn().Err(err).Msg("failed read from remote track")
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break
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}
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srcManager.Push(buf[:i])
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}
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logger.Info().Msg("remote track data finished")
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})
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connection.OnDataChannel(func(dc *webrtc.DataChannel) {
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logger.Info().Interface("data_channel", dc).Msg("got remote data channel")
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})
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var once sync.Once
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connection.OnConnectionStateChange(func(state webrtc.PeerConnectionState) {
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switch state {
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case webrtc.PeerConnectionStateConnected:
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session.SetWebRTCConnected(peer, true)
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case webrtc.PeerConnectionStateDisconnected,
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webrtc.PeerConnectionStateFailed:
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peer.Destroy()
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case webrtc.PeerConnectionStateClosed:
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// ensure we only run this once
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once.Do(func() {
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session.SetWebRTCConnected(peer, false)
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if err = video.RemoveReceiver(videoTrack); err != nil {
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logger.Err(err).Msg("failed to remove video receiver")
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}
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audioTrack.Shutdown()
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videoTrack.Shutdown()
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close(videoRtcp)
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})
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}
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metrics.SetState(state)
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})
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dataChannel.OnOpen(func() {
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manager.curImage.AddListener(peer)
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manager.curPosition.AddListener(peer)
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// send initial cursor image
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cur, img, err := manager.curImage.GetCurrent()
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if err == nil {
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err := peer.SendCursorImage(cur, img)
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if err != nil {
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logger.Err(err).Msg("failed to set cursor image")
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}
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} else {
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logger.Err(err).Msg("failed to get cursor image")
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}
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// send initial cursor position
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x, y := manager.desktop.GetCursorPosition()
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err = peer.SendCursorPosition(x, y)
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if err != nil {
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logger.Err(err).Msg("failed to set cursor position")
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}
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})
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dataChannel.OnClose(func() {
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manager.curImage.RemoveListener(peer)
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manager.curPosition.RemoveListener(peer)
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})
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dataChannel.OnMessage(func(message webrtc.DataChannelMessage) {
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if err := manager.handle(logger, message.Data, dataChannel, session); err != nil {
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logger.Err(err).Msg("data handle failed")
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}
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})
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session.SetWebRTCPeer(peer)
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offer, err := peer.CreateOffer(false)
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if err != nil {
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return nil, err
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}
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// on negotiation needed handler must be registered after creating initial
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// offer, otherwise it can fire and intercept sucessful negotiation
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connection.OnNegotiationNeeded(func() {
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logger.Warn().Msg("negotiation is needed")
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if connection.SignalingState() != webrtc.SignalingStateStable {
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logger.Warn().Msg("connection isn't stable yet; postponing...")
|
|
return
|
|
}
|
|
|
|
offer, err := peer.CreateOffer(false)
|
|
if err != nil {
|
|
logger.Err(err).Msg("sdp offer failed")
|
|
return
|
|
}
|
|
|
|
session.Send(
|
|
event.SIGNAL_OFFER,
|
|
message.SignalDescription{
|
|
SDP: offer.SDP,
|
|
})
|
|
})
|
|
|
|
// start metrics collectors
|
|
go metrics.rtcpReceiver(videoRtcp)
|
|
go metrics.connectionStats(connection)
|
|
|
|
// start estimator reader
|
|
go peer.estimatorReader()
|
|
|
|
return offer, nil
|
|
}
|
|
|
|
func (manager *WebRTCManagerCtx) SetCursorPosition(x, y int) {
|
|
manager.curPosition.Set(x, y)
|
|
}
|