forked from ionorg/ion-sfu
/
publisher.go
298 lines (256 loc) · 7.38 KB
/
publisher.go
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package sfu
import (
"fmt"
"io"
"sync"
"sync/atomic"
"time"
"github.com/pion/ion-sfu/pkg/relay"
"github.com/pion/rtcp"
"github.com/pion/webrtc/v3"
)
type Publisher struct {
mu sync.Mutex
id string
pc *webrtc.PeerConnection
cfg *WebRTCTransportConfig
router Router
session Session
tracks []publisherTracks
relayPeer []*relay.Peer
candidates []webrtc.ICECandidateInit
onICEConnectionStateChangeHandler atomic.Value // func(webrtc.ICEConnectionState)
closeOnce sync.Once
}
type publisherTracks struct {
track *webrtc.TrackRemote
receiver Receiver
// This will be used in the future for tracks that will be relayed as clients or servers
// This is for SVC and Simulcast where you will be able to chose if the relayed peer just
// want a single track (for recording/ processing) or get all the tracks (for load balancing)
clientRelay bool
}
// NewPublisher creates a new Publisher
func NewPublisher(id string, session Session, cfg *WebRTCTransportConfig) (*Publisher, error) {
me, err := getPublisherMediaEngine()
if err != nil {
Logger.Error(err, "NewPeer error", "peer_id", id)
return nil, errPeerConnectionInitFailed
}
api := webrtc.NewAPI(webrtc.WithMediaEngine(me), webrtc.WithSettingEngine(cfg.Setting))
pc, err := api.NewPeerConnection(cfg.Configuration)
if err != nil {
Logger.Error(err, "NewPeer error", "peer_id", id)
return nil, errPeerConnectionInitFailed
}
p := &Publisher{
id: id,
pc: pc,
cfg: cfg,
router: newRouter(id, pc, session, cfg),
session: session,
}
pc.OnTrack(func(track *webrtc.TrackRemote, receiver *webrtc.RTPReceiver) {
Logger.V(1).Info("Peer got remote track id",
"peer_id", p.id,
"track_id", track.ID(),
"mediaSSRC", track.SSRC(),
"rid", track.RID(),
"stream_id", track.StreamID(),
)
r, pub := p.router.AddReceiver(receiver, track)
if pub {
p.session.Publish(p.router, r)
p.mu.Lock()
p.tracks = append(p.tracks, publisherTracks{track, r, true})
for _, rp := range p.relayPeer {
if err = p.createRelayTrack(track, r, rp); err != nil {
Logger.V(1).Error(err, "Creating relay track.", "peer_id", p.id)
}
}
p.mu.Unlock()
} else {
p.mu.Lock()
p.tracks = append(p.tracks, publisherTracks{track, r, false})
p.mu.Unlock()
}
})
pc.OnDataChannel(func(dc *webrtc.DataChannel) {
if dc.Label() == APIChannelLabel {
// terminate api data channel
return
}
p.session.AddDatachannel(id, dc)
})
pc.OnICEConnectionStateChange(func(connectionState webrtc.ICEConnectionState) {
Logger.V(1).Info("ice connection status", "state", connectionState)
switch connectionState {
case webrtc.ICEConnectionStateFailed:
fallthrough
case webrtc.ICEConnectionStateClosed:
Logger.V(1).Info("webrtc ice closed", "peer_id", p.id)
p.Close()
}
if handler, ok := p.onICEConnectionStateChangeHandler.Load().(func(webrtc.ICEConnectionState)); ok && handler != nil {
handler(connectionState)
}
})
return p, nil
}
func (p *Publisher) Answer(offer webrtc.SessionDescription) (webrtc.SessionDescription, error) {
if err := p.pc.SetRemoteDescription(offer); err != nil {
return webrtc.SessionDescription{}, err
}
for _, c := range p.candidates {
if err := p.pc.AddICECandidate(c); err != nil {
Logger.Error(err, "Add publisher ice candidate to peer err", "peer_id", p.id)
}
}
p.candidates = nil
answer, err := p.pc.CreateAnswer(nil)
if err != nil {
return webrtc.SessionDescription{}, err
}
if err := p.pc.SetLocalDescription(answer); err != nil {
return webrtc.SessionDescription{}, err
}
return answer, nil
}
// GetRouter returns Router with mediaSSRC
func (p *Publisher) GetRouter() Router {
return p.router
}
// Close peer
func (p *Publisher) Close() {
p.closeOnce.Do(func() {
if len(p.relayPeer) > 0 {
p.mu.Lock()
for _, rp := range p.relayPeer {
if err := rp.Close(); err != nil {
Logger.Error(err, "Closing relay peer transport.")
}
}
p.mu.Unlock()
}
p.router.Stop()
if err := p.pc.Close(); err != nil {
Logger.Error(err, "webrtc transport close err")
}
})
}
// OnICECandidate handler
func (p *Publisher) OnICECandidate(f func(c *webrtc.ICECandidate)) {
p.pc.OnICECandidate(f)
}
func (p *Publisher) OnICEConnectionStateChange(f func(connectionState webrtc.ICEConnectionState)) {
p.onICEConnectionStateChangeHandler.Store(f)
}
func (p *Publisher) SignalingState() webrtc.SignalingState {
return p.pc.SignalingState()
}
func (p *Publisher) PeerConnection() *webrtc.PeerConnection {
return p.pc
}
func (p *Publisher) Relay(ice []webrtc.ICEServer) (*relay.Peer, error) {
rp, err := relay.NewPeer(relay.PeerMeta{
PeerID: p.id,
SessionID: p.session.ID(),
}, &relay.PeerConfig{
SettingEngine: p.cfg.Setting,
ICEServers: ice,
Logger: Logger,
})
if err != nil {
return nil, fmt.Errorf("relay: %w", err)
}
rp.OnReady(func() {
for _, lbl := range p.session.GetDataChannelLabels() {
if _, err := rp.CreateDataChannel(lbl); err != nil {
Logger.V(1).Error(err, "Creating data channels.", "peer_id", p.id)
}
}
p.mu.Lock()
for _, tp := range p.tracks {
if !tp.clientRelay {
// simulcast will just relay client track for now
continue
}
if err = p.createRelayTrack(tp.track, tp.receiver, rp); err != nil {
Logger.V(1).Error(err, "Creating relay track.", "peer_id", p.id)
}
}
p.relayPeer = append(p.relayPeer, rp)
p.mu.Unlock()
go p.relayReports(rp)
})
if err = rp.Offer(p.cfg.Relay); err != nil {
return nil, fmt.Errorf("relay: %w", err)
}
return rp, nil
}
func (p *Publisher) Tracks() []*webrtc.TrackRemote {
p.mu.Lock()
defer p.mu.Unlock()
tracks := make([]*webrtc.TrackRemote, len(p.tracks))
for idx, track := range p.tracks {
tracks[idx] = track.track
}
return tracks
}
// AddICECandidate to peer connection
func (p *Publisher) AddICECandidate(candidate webrtc.ICECandidateInit) error {
if p.pc.RemoteDescription() != nil {
return p.pc.AddICECandidate(candidate)
}
p.candidates = append(p.candidates, candidate)
return nil
}
func (p *Publisher) createRelayTrack(track *webrtc.TrackRemote, receiver Receiver, rp *relay.Peer) error {
codec := track.Codec()
downTrack, err := NewDownTrack(webrtc.RTPCodecCapability{
MimeType: codec.MimeType,
ClockRate: codec.ClockRate,
Channels: codec.Channels,
SDPFmtpLine: codec.SDPFmtpLine,
RTCPFeedback: []webrtc.RTCPFeedback{{"nack", ""}, {"nack", "pli"}},
}, receiver, p.cfg.BufferFactory, p.id, p.cfg.Router.MaxPacketTrack)
if err != nil {
Logger.V(1).Error(err, "Create Relay downtrack err", "peer_id", p.id)
return err
}
sdr, err := rp.AddTrack(receiver.(*WebRTCReceiver).receiver, track, downTrack)
if err != nil {
Logger.V(1).Error(err, "Relaying track.", "peer_id", p.id)
return fmt.Errorf("relay: %w", err)
}
downTrack.OnCloseHandler(func() {
if err = sdr.Stop(); err != nil {
Logger.V(1).Error(err, "Stopping relay sender.", "peer_id", p.id)
}
})
receiver.AddDownTrack(downTrack, true)
return nil
}
func (p *Publisher) relayReports(rp *relay.Peer) {
for {
time.Sleep(5 * time.Second)
var r []rtcp.Packet
for _, t := range rp.LocalTracks() {
if dt, ok := t.(*DownTrack); ok {
if !dt.bound.get() {
continue
}
r = append(r, dt.CreateSenderReport())
}
}
if len(r) == 0 {
continue
}
if err := rp.WriteRTCP(r); err != nil {
if err == io.EOF || err == io.ErrClosedPipe {
return
}
Logger.Error(err, "Sending downtrack reports err")
}
}
}