subscriber control of tracks (unsubscribe/mute/quality), support simulcast (#23)

* subscription control & simulcast RTC APIs

* don't remove tracks for simulcast

pkg/rtc/datatrack.go

@@ -89,6 +89,13 @@ func (t *DataTrack) OnClose(f func()) {
 }
 
 func (t *DataTrack) AddSubscriber(participant types.Participant) error {
+	t.lock.Lock()
+	defer t.lock.Unlock()
+
+	if t.subscribers[participant.ID()] != nil {
+		return nil
+	}
+
 	label := PackDataTrackLabel(t.participantId, t.ID(), t.dataChannel.Label())
 	downChannel, err := participant.SubscriberPC().CreateDataChannel(label, t.dataChannelOptions())
 	if err != nil {
@@ -100,9 +107,7 @@ func (t *DataTrack) AddSubscriber(participant types.Participant) error {
 		dataChannel:   downChannel,
 	}
 
-	t.lock.Lock()
 	t.subscribers[participant.ID()] = sub
-	t.lock.Unlock()
 
 	downChannel.OnClose(func() {
 		t.RemoveSubscriber(sub.participantId)

pkg/rtc/mediatrack.go

@@ -117,9 +117,6 @@ func (t *MediaTrack) AddSubscriber(sub types.Participant) error {
 
 	// don't subscribe to the same track multiple times
 	if existingSt != nil {
-		logger.Warnw("participant already subscribed to track",
-			"sub", sub.Identity(),
-			"track", t.ID())
 		return nil
 	}
 

pkg/rtc/participant.go

@@ -265,6 +265,12 @@ func (p *ParticipantImpl) AddTrack(clientId, name string, trackType livekit.Trac
 	})
 }
 
+func (p *ParticipantImpl) GetPublishedTracks() []types.PublishedTrack {
+	p.lock.RUnlock()
+	defer p.lock.RUnlock()
+	return funk.Values(p.publishedTracks).([]types.PublishedTrack)
+}
+
 // handles a client answer response, with subscriber PC, server initiates the offer
 // and client answers
 func (p *ParticipantImpl) HandleAnswer(sdp webrtc.SessionDescription) error {
@@ -455,6 +461,12 @@ func (p *ParticipantImpl) SubscriberPC() *webrtc.PeerConnection {
 	return p.subscriber.pc
 }
 
+func (p *ParticipantImpl) GetSubscribedTracks() []types.SubscribedTrack {
+	p.lock.RLock()
+	defer p.lock.RUnlock()
+	return funk.Values(p.subscribedTracks).([]types.SubscribedTrack)
+}
+
 // add a track to the participant's subscribed list
 func (p *ParticipantImpl) AddSubscribedTrack(pubId string, subTrack types.SubscribedTrack) {
 	logger.Debugw("added subscribedTrack", "srcParticipant", pubId,
@@ -561,9 +573,13 @@ func (p *ParticipantImpl) writeMessage(msg *livekit.SignalResponse) error {
 
 // when a new remoteTrack is created, creates a Track and adds it to room
 func (p *ParticipantImpl) onMediaTrack(track *webrtc.TrackRemote, rtpReceiver *webrtc.RTPReceiver) {
-	logger.Debugw("mediaTrack added", "participant", p.Identity(), "remoteTrack", track.ID())
+	logger.Debugw("mediaTrack added",
+		"participant", p.Identity(),
+		"remoteTrack", track.ID(),
+		"rid", track.RID())
 
-	ti := p.popPendingTrack(track.ID(), ToProtoTrackKind(track.Kind()))
+	// delete pending track if it's not simulcasting
+	ti := p.getPendingTrack(track.ID(), ToProtoTrackKind(track.Kind()), track.RID() == "")
 	if ti == nil {
 		return
 	}
@@ -575,7 +591,6 @@ func (p *ParticipantImpl) onMediaTrack(track *webrtc.TrackRemote, rtpReceiver *w
 	var mt *MediaTrack
 	var newTrack bool
 	if trk, ok := ptrack.(*MediaTrack); ok {
-		logger.Debugw("using existing mediatrack, simulcast", "rid", track.RID())
 		mt = trk
 	} else {
 		mt = NewMediaTrack(ti.Sid, p.id, p.rtcpCh, track, p.receiverConfig, p.audioConfig)
@@ -604,7 +619,7 @@ func (p *ParticipantImpl) onDataChannel(dc *webrtc.DataChannel) {
 	logger.Debugw("dataChannel added", "participant", p.Identity(), "label", dc.Label())
 
 	// data channels have numeric ids, so we use its label to identify
-	ti := p.popPendingTrack(dc.Label(), livekit.TrackType_DATA)
+	ti := p.getPendingTrack(dc.Label(), livekit.TrackType_DATA, true)
 	if ti == nil {
 		return
 	}
@@ -615,7 +630,7 @@ func (p *ParticipantImpl) onDataChannel(dc *webrtc.DataChannel) {
 	p.handleTrackPublished(dt)
 }
 
-func (p *ParticipantImpl) popPendingTrack(clientId string, kind livekit.TrackType) *livekit.TrackInfo {
+func (p *ParticipantImpl) getPendingTrack(clientId string, kind livekit.TrackType, deleteAfter bool) *livekit.TrackInfo {
 	p.lock.Lock()
 	defer p.lock.Unlock()
 	ti := p.pendingTracks[clientId]
@@ -635,7 +650,7 @@ func (p *ParticipantImpl) popPendingTrack(clientId string, kind livekit.TrackTyp
 	// if still not found, we are done
 	if ti == nil {
 		logger.Errorw("track info not published prior to track", "clientId", clientId)
-	} else {
+	} else if deleteAfter {
 		delete(p.pendingTracks, clientId)
 	}
 	return ti

pkg/rtc/room.go

@@ -215,6 +215,33 @@ func (r *Room) RemoveParticipant(identity string) {
 	}
 }
 
+func (r *Room) UpdateSubscriptions(participant types.Participant, subscription *livekit.UpdateSubscription) error {
+	// find all matching tracks
+	var tracks []types.PublishedTrack
+	participants := r.GetParticipants()
+	for _, p := range participants {
+		for _, sid := range subscription.TrackSids {
+			for _, track := range p.GetPublishedTracks() {
+				if sid == track.ID() {
+					tracks = append(tracks, track)
+				}
+			}
+		}
+	}
+
+	// handle subscription changes
+	for _, track := range tracks {
+		if subscription.Subscribe {
+			if err := track.AddSubscriber(participant); err != nil {
+				return err
+			}
+		} else {
+			track.RemoveSubscriber(participant.ID())
+		}
+	}
+	return nil
+}
+
 // Close the room if all participants had left, or it's still empty past timeout
 func (r *Room) CloseIfEmpty() {
 	if r.isClosed.Get() {

pkg/rtc/subscribedtrack.go

@@ -2,8 +2,10 @@ package rtc
 
 import (
 	"github.com/pion/ion-sfu/pkg/sfu"
+	"github.com/pion/webrtc/v3"
 
 	"github.com/livekit/livekit-server/pkg/utils"
+	"github.com/livekit/livekit-server/proto/livekit"
 )
 
 type SubscribedTrack struct {
@@ -18,6 +20,10 @@ func NewSubscribedTrack(dt *sfu.DownTrack) *SubscribedTrack {
 	}
 }
 
+func (t *SubscribedTrack) ID() string {
+	return t.dt.ID()
+}
+
 func (t *SubscribedTrack) DownTrack() *sfu.DownTrack {
 	return t.dt
 }
@@ -38,6 +44,12 @@ func (t *SubscribedTrack) SetPublisherMuted(muted bool) {
 	t.updateDownTrackMute()
 }
 
+func (t *SubscribedTrack) SetVideoQuality(quality livekit.VideoQuality) {
+	if t.dt.Kind() == webrtc.RTPCodecTypeVideo {
+		t.dt.SwitchSpatialLayer(int64(quality), true)
+	}
+}
+
 func (t *SubscribedTrack) updateDownTrackMute() {
 	muted := t.subMuted.Get() || t.pubMuted.Get()
 	t.dt.Mute(muted)

pkg/rtc/types/interfaces.go

@@ -34,6 +34,8 @@ type Participant interface {
 	SubscriberMediaEngine() *webrtc.MediaEngine
 
 	AddTrack(clientId, name string, trackType livekit.TrackType)
+	GetPublishedTracks() []PublishedTrack
+	GetSubscribedTracks() []SubscribedTrack
 	HandleOffer(sdp webrtc.SessionDescription) (answer webrtc.SessionDescription, err error)
 	HandleAnswer(sdp webrtc.SessionDescription) error
 	AddICECandidate(candidate webrtc.ICECandidateInit, target livekit.SignalTarget) error
@@ -82,9 +84,11 @@ type PublishedTrack interface {
 
 //counterfeiter:generate . SubscribedTrack
 type SubscribedTrack interface {
+	ID() string
 	DownTrack() *sfu.DownTrack
 	IsMuted() bool
 	SetMuted(muted bool)
+	SetVideoQuality(quality livekit.VideoQuality)
 	SetPublisherMuted(muted bool)
 }
 

pkg/rtc/types/typesfakes/fake_participant.go

@@ -70,6 +70,16 @@ type FakeParticipant struct {
 		result1 uint8
 		result2 bool
 	}
+	GetPublishedTracksStub        func() []types.PublishedTrack
+	getPublishedTracksMutex       sync.RWMutex
+	getPublishedTracksArgsForCall []struct {
+	}
+	getPublishedTracksReturns struct {
+		result1 []types.PublishedTrack
+	}
+	getPublishedTracksReturnsOnCall map[int]struct {
+		result1 []types.PublishedTrack
+	}
 	GetResponseSinkStub        func() routing.MessageSink
 	getResponseSinkMutex       sync.RWMutex
 	getResponseSinkArgsForCall []struct {
@@ -80,6 +90,16 @@ type FakeParticipant struct {
 	getResponseSinkReturnsOnCall map[int]struct {
 		result1 routing.MessageSink
 	}
+	GetSubscribedTracksStub        func() []types.SubscribedTrack
+	getSubscribedTracksMutex       sync.RWMutex
+	getSubscribedTracksArgsForCall []struct {
+	}
+	getSubscribedTracksReturns struct {
+		result1 []types.SubscribedTrack
+	}
+	getSubscribedTracksReturnsOnCall map[int]struct {
+		result1 []types.SubscribedTrack
+	}
 	HandleAnswerStub        func(webrtc.SessionDescription) error
 	handleAnswerMutex       sync.RWMutex
 	handleAnswerArgsForCall []struct {
@@ -578,6 +598,59 @@ func (fake *FakeParticipant) GetAudioLevelReturnsOnCall(i int, result1 uint8, re
 	}{result1, result2}
 }
 
+func (fake *FakeParticipant) GetPublishedTracks() []types.PublishedTrack {
+	fake.getPublishedTracksMutex.Lock()
+	ret, specificReturn := fake.getPublishedTracksReturnsOnCall[len(fake.getPublishedTracksArgsForCall)]
+	fake.getPublishedTracksArgsForCall = append(fake.getPublishedTracksArgsForCall, struct {
+	}{})
+	stub := fake.GetPublishedTracksStub
+	fakeReturns := fake.getPublishedTracksReturns
+	fake.recordInvocation("GetPublishedTracks", []interface{}{})
+	fake.getPublishedTracksMutex.Unlock()
+	if stub != nil {
+		return stub()
+	}
+	if specificReturn {
+		return ret.result1
+	}
+	return fakeReturns.result1
+}
+
+func (fake *FakeParticipant) GetPublishedTracksCallCount() int {
+	fake.getPublishedTracksMutex.RLock()
+	defer fake.getPublishedTracksMutex.RUnlock()
+	return len(fake.getPublishedTracksArgsForCall)
+}
+
+func (fake *FakeParticipant) GetPublishedTracksCalls(stub func() []types.PublishedTrack) {
+	fake.getPublishedTracksMutex.Lock()
+	defer fake.getPublishedTracksMutex.Unlock()
+	fake.GetPublishedTracksStub = stub
+}
+
+func (fake *FakeParticipant) GetPublishedTracksReturns(result1 []types.PublishedTrack) {
+	fake.getPublishedTracksMutex.Lock()
+	defer fake.getPublishedTracksMutex.Unlock()
+	fake.GetPublishedTracksStub = nil
+	fake.getPublishedTracksReturns = struct {
+		result1 []types.PublishedTrack
+	}{result1}
+}
+
+func (fake *FakeParticipant) GetPublishedTracksReturnsOnCall(i int, result1 []types.PublishedTrack) {
+	fake.getPublishedTracksMutex.Lock()
+	defer fake.getPublishedTracksMutex.Unlock()
+	fake.GetPublishedTracksStub = nil
+	if fake.getPublishedTracksReturnsOnCall == nil {
+		fake.getPublishedTracksReturnsOnCall = make(map[int]struct {
+			result1 []types.PublishedTrack
+		})
+	}
+	fake.getPublishedTracksReturnsOnCall[i] = struct {
+		result1 []types.PublishedTrack
+	}{result1}
+}
+
 func (fake *FakeParticipant) GetResponseSink() routing.MessageSink {
 	fake.getResponseSinkMutex.Lock()
 	ret, specificReturn := fake.getResponseSinkReturnsOnCall[len(fake.getResponseSinkArgsForCall)]
@@ -631,6 +704,59 @@ func (fake *FakeParticipant) GetResponseSinkReturnsOnCall(i int, result1 routing
 	}{result1}
 }
 
+func (fake *FakeParticipant) GetSubscribedTracks() []types.SubscribedTrack {
+	fake.getSubscribedTracksMutex.Lock()
+	ret, specificReturn := fake.getSubscribedTracksReturnsOnCall[len(fake.getSubscribedTracksArgsForCall)]
+	fake.getSubscribedTracksArgsForCall = append(fake.getSubscribedTracksArgsForCall, struct {
+	}{})
+	stub := fake.GetSubscribedTracksStub
+	fakeReturns := fake.getSubscribedTracksReturns
+	fake.recordInvocation("GetSubscribedTracks", []interface{}{})
+	fake.getSubscribedTracksMutex.Unlock()
+	if stub != nil {
+		return stub()
+	}
+	if specificReturn {
+		return ret.result1
+	}
+	return fakeReturns.result1
+}
+
+func (fake *FakeParticipant) GetSubscribedTracksCallCount() int {
+	fake.getSubscribedTracksMutex.RLock()
+	defer fake.getSubscribedTracksMutex.RUnlock()
+	return len(fake.getSubscribedTracksArgsForCall)
+}
+
+func (fake *FakeParticipant) GetSubscribedTracksCalls(stub func() []types.SubscribedTrack) {
+	fake.getSubscribedTracksMutex.Lock()
+	defer fake.getSubscribedTracksMutex.Unlock()
+	fake.GetSubscribedTracksStub = stub
+}
+
+func (fake *FakeParticipant) GetSubscribedTracksReturns(result1 []types.SubscribedTrack) {
+	fake.getSubscribedTracksMutex.Lock()
+	defer fake.getSubscribedTracksMutex.Unlock()
+	fake.GetSubscribedTracksStub = nil
+	fake.getSubscribedTracksReturns = struct {
+		result1 []types.SubscribedTrack
+	}{result1}
+}
+
+func (fake *FakeParticipant) GetSubscribedTracksReturnsOnCall(i int, result1 []types.SubscribedTrack) {
+	fake.getSubscribedTracksMutex.Lock()
+	defer fake.getSubscribedTracksMutex.Unlock()
+	fake.GetSubscribedTracksStub = nil
+	if fake.getSubscribedTracksReturnsOnCall == nil {
+		fake.getSubscribedTracksReturnsOnCall = make(map[int]struct {
+			result1 []types.SubscribedTrack
+		})
+	}
+	fake.getSubscribedTracksReturnsOnCall[i] = struct {
+		result1 []types.SubscribedTrack
+	}{result1}
+}
+
 func (fake *FakeParticipant) HandleAnswer(arg1 webrtc.SessionDescription) error {
 	fake.handleAnswerMutex.Lock()
 	ret, specificReturn := fake.handleAnswerReturnsOnCall[len(fake.handleAnswerArgsForCall)]
@@ -1737,8 +1863,12 @@ func (fake *FakeParticipant) Invocations() map[string][][]interface{} {
 	defer fake.closeMutex.RUnlock()
 	fake.getAudioLevelMutex.RLock()
 	defer fake.getAudioLevelMutex.RUnlock()
+	fake.getPublishedTracksMutex.RLock()
+	defer fake.getPublishedTracksMutex.RUnlock()
 	fake.getResponseSinkMutex.RLock()
 	defer fake.getResponseSinkMutex.RUnlock()
+	fake.getSubscribedTracksMutex.RLock()
+	defer fake.getSubscribedTracksMutex.RUnlock()
 	fake.handleAnswerMutex.RLock()
 	defer fake.handleAnswerMutex.RUnlock()
 	fake.handleOfferMutex.RLock()

pkg/rtc/types/typesfakes/fake_subscribed_track.go

@@ -5,6 +5,7 @@ import (
 	"sync"
 
 	"github.com/livekit/livekit-server/pkg/rtc/types"
+	"github.com/livekit/livekit-server/proto/livekit"
 	"github.com/pion/ion-sfu/pkg/sfu"
 )
 
@@ -19,6 +20,16 @@ type FakeSubscribedTrack struct {
 	downTrackReturnsOnCall map[int]struct {
 		result1 *sfu.DownTrack
 	}
+	IDStub        func() string
+	iDMutex       sync.RWMutex
+	iDArgsForCall []struct {
+	}
+	iDReturns struct {
+		result1 string
+	}
+	iDReturnsOnCall map[int]struct {
+		result1 string
+	}
 	IsMutedStub        func() bool
 	isMutedMutex       sync.RWMutex
 	isMutedArgsForCall []struct {
@@ -39,6 +50,11 @@ type FakeSubscribedTrack struct {
 	setPublisherMutedArgsForCall []struct {
 		arg1 bool
 	}
+	SetVideoQualityStub        func(livekit.VideoQuality)
+	setVideoQualityMutex       sync.RWMutex
+	setVideoQualityArgsForCall []struct {
+		arg1 livekit.VideoQuality
+	}
 	invocations      map[string][][]interface{}
 	invocationsMutex sync.RWMutex
 }
@@ -96,6 +112,59 @@ func (fake *FakeSubscribedTrack) DownTrackReturnsOnCall(i int, result1 *sfu.Down
 	}{result1}
 }
 
+func (fake *FakeSubscribedTrack) ID() string {
+	fake.iDMutex.Lock()
+	ret, specificReturn := fake.iDReturnsOnCall[len(fake.iDArgsForCall)]
+	fake.iDArgsForCall = append(fake.iDArgsForCall, struct {
+	}{})
+	stub := fake.IDStub
+	fakeReturns := fake.iDReturns
+	fake.recordInvocation("ID", []interface{}{})
+	fake.iDMutex.Unlock()
+	if stub != nil {
+		return stub()
+	}
+	if specificReturn {
+		return ret.result1
+	}
+	return fakeReturns.result1
+}
+
+func (fake *FakeSubscribedTrack) IDCallCount() int {
+	fake.iDMutex.RLock()
+	defer fake.iDMutex.RUnlock()
+	return len(fake.iDArgsForCall)
+}
+
+func (fake *FakeSubscribedTrack) IDCalls(stub func() string) {
+	fake.iDMutex.Lock()
+	defer fake.iDMutex.Unlock()
+	fake.IDStub = stub
+}
+
+func (fake *FakeSubscribedTrack) IDReturns(result1 string) {
+	fake.iDMutex.Lock()
+	defer fake.iDMutex.Unlock()
+	fake.IDStub = nil
+	fake.iDReturns = struct {
+		result1 string
+	}{result1}
+}
+
+func (fake *FakeSubscribedTrack) IDReturnsOnCall(i int, result1 string) {
+	fake.iDMutex.Lock()
+	defer fake.iDMutex.Unlock()
+	fake.IDStub = nil
+	if fake.iDReturnsOnCall == nil {
+		fake.iDReturnsOnCall = make(map[int]struct {
+			result1 string
+		})
+	}
+	fake.iDReturnsOnCall[i] = struct {
+		result1 string
+	}{result1}
+}
+
 func (fake *FakeSubscribedTrack) IsMuted() bool {
 	fake.isMutedMutex.Lock()
 	ret, specificReturn := fake.isMutedReturnsOnCall[len(fake.isMutedArgsForCall)]
@@ -213,17 +282,53 @@ func (fake *FakeSubscribedTrack) SetPublisherMutedArgsForCall(i int) bool {
 	return argsForCall.arg1
 }
 
+func (fake *FakeSubscribedTrack) SetVideoQuality(arg1 livekit.VideoQuality) {
+	fake.setVideoQualityMutex.Lock()
+	fake.setVideoQualityArgsForCall = append(fake.setVideoQualityArgsForCall, struct {
+		arg1 livekit.VideoQuality
+	}{arg1})
+	stub := fake.SetVideoQualityStub
+	fake.recordInvocation("SetVideoQuality", []interface{}{arg1})
+	fake.setVideoQualityMutex.Unlock()
+	if stub != nil {
+		fake.SetVideoQualityStub(arg1)
+	}
+}
+
+func (fake *FakeSubscribedTrack) SetVideoQualityCallCount() int {
+	fake.setVideoQualityMutex.RLock()
+	defer fake.setVideoQualityMutex.RUnlock()
+	return len(fake.setVideoQualityArgsForCall)
+}
+
+func (fake *FakeSubscribedTrack) SetVideoQualityCalls(stub func(livekit.VideoQuality)) {
+	fake.setVideoQualityMutex.Lock()
+	defer fake.setVideoQualityMutex.Unlock()
+	fake.SetVideoQualityStub = stub
+}
+
+func (fake *FakeSubscribedTrack) SetVideoQualityArgsForCall(i int) livekit.VideoQuality {
+	fake.setVideoQualityMutex.RLock()
+	defer fake.setVideoQualityMutex.RUnlock()
+	argsForCall := fake.setVideoQualityArgsForCall[i]
+	return argsForCall.arg1
+}
+
 func (fake *FakeSubscribedTrack) Invocations() map[string][][]interface{} {
 	fake.invocationsMutex.RLock()
 	defer fake.invocationsMutex.RUnlock()
 	fake.downTrackMutex.RLock()
 	defer fake.downTrackMutex.RUnlock()
+	fake.iDMutex.RLock()
+	defer fake.iDMutex.RUnlock()
 	fake.isMutedMutex.RLock()
 	defer fake.isMutedMutex.RUnlock()
 	fake.setMutedMutex.RLock()
 	defer fake.setMutedMutex.RUnlock()
 	fake.setPublisherMutedMutex.RLock()
 	defer fake.setPublisherMutedMutex.RUnlock()
+	fake.setVideoQualityMutex.RLock()
+	defer fake.setVideoQualityMutex.RUnlock()
 	copiedInvocations := map[string][][]interface{}{}
 	for key, value := range fake.invocations {
 		copiedInvocations[key] = value

pkg/service/roommanager.go

@@ -302,6 +302,18 @@ func (r *RoomManager) rtcSessionWorker(room *rtc.Room, participant types.Partici
 				}
 			case *livekit.SignalRequest_Mute:
 				participant.SetTrackMuted(msg.Mute.Sid, msg.Mute.Muted)
+			case *livekit.SignalRequest_Subscription:
+				room.UpdateSubscriptions(participant, msg.Subscription)
+			case *livekit.SignalRequest_TrackSetting:
+				for _, subTrack := range participant.GetSubscribedTracks() {
+					for _, sid := range msg.TrackSetting.TrackSids {
+						if subTrack.ID() != sid {
+							continue
+						}
+						subTrack.SetMuted(msg.TrackSetting.Mute)
+						subTrack.SetVideoQuality(msg.TrackSetting.Quality)
+					}
+				}
 			}
 		}
 	}

proto/livekit/rtc.pb.go

@@ -71,6 +71,55 @@ func (SignalTarget) EnumDescriptor() ([]byte, []int) {
 	return file_rtc_proto_rawDescGZIP(), []int{0}
 }
 
+type VideoQuality int32
+
+const (
+	VideoQuality_LOW    VideoQuality = 0
+	VideoQuality_MEDIUM VideoQuality = 1
+	VideoQuality_HIGH   VideoQuality = 2
+)
+
+// Enum value maps for VideoQuality.
+var (
+	VideoQuality_name = map[int32]string{
+		0: "LOW",
+		1: "MEDIUM",
+		2: "HIGH",
+	}
+	VideoQuality_value = map[string]int32{
+		"LOW":    0,
+		"MEDIUM": 1,
+		"HIGH":   2,
+	}
+)
+
+func (x VideoQuality) Enum() *VideoQuality {
+	p := new(VideoQuality)
+	*p = x
+	return p
+}
+
+func (x VideoQuality) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (VideoQuality) Descriptor() protoreflect.EnumDescriptor {
+	return file_rtc_proto_enumTypes[1].Descriptor()
+}
+
+func (VideoQuality) Type() protoreflect.EnumType {
+	return &file_rtc_proto_enumTypes[1]
+}
+
+func (x VideoQuality) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Use VideoQuality.Descriptor instead.
+func (VideoQuality) EnumDescriptor() ([]byte, []int) {
+	return file_rtc_proto_rawDescGZIP(), []int{1}
+}
+
 type SignalRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -82,7 +131,8 @@ type SignalRequest struct {
 	//	*SignalRequest_Trickle
 	//	*SignalRequest_AddTrack
 	//	*SignalRequest_Mute
-	//	*SignalRequest_MuteSubscribed
+	//	*SignalRequest_Subscription
+	//	*SignalRequest_TrackSetting
 	Message isSignalRequest_Message `protobuf_oneof:"message"`
 }
 
@@ -160,9 +210,16 @@ func (x *SignalRequest) GetMute() *MuteTrackRequest {
 	return nil
 }
 
-func (x *SignalRequest) GetMuteSubscribed() *MuteTrackRequest {
-	if x, ok := x.GetMessage().(*SignalRequest_MuteSubscribed); ok {
-		return x.MuteSubscribed
+func (x *SignalRequest) GetSubscription() *UpdateSubscription {
+	if x, ok := x.GetMessage().(*SignalRequest_Subscription); ok {
+		return x.Subscription
+	}
+	return nil
+}
+
+func (x *SignalRequest) GetTrackSetting() *UpdateTrackSettings {
+	if x, ok := x.GetMessage().(*SignalRequest_TrackSetting); ok {
+		return x.TrackSetting
 	}
 	return nil
 }
@@ -194,9 +251,14 @@ type SignalRequest_Mute struct {
 	Mute *MuteTrackRequest `protobuf:"bytes,5,opt,name=mute,proto3,oneof"`
 }
 
-type SignalRequest_MuteSubscribed struct {
-	// mute a track client is subscribed to
-	MuteSubscribed *MuteTrackRequest `protobuf:"bytes,6,opt,name=mute_subscribed,json=muteSubscribed,proto3,oneof"`
+type SignalRequest_Subscription struct {
+	// Subscribe or unsubscribe from tracks
+	Subscription *UpdateSubscription `protobuf:"bytes,6,opt,name=subscription,proto3,oneof"`
+}
+
+type SignalRequest_TrackSetting struct {
+	// Update settings of subscribed tracks
+	TrackSetting *UpdateTrackSettings `protobuf:"bytes,7,opt,name=track_setting,json=trackSetting,proto3,oneof"`
 }
 
 func (*SignalRequest_Offer) isSignalRequest_Message() {}
@@ -209,7 +271,9 @@ func (*SignalRequest_AddTrack) isSignalRequest_Message() {}
 
 func (*SignalRequest_Mute) isSignalRequest_Message() {}
 
-func (*SignalRequest_MuteSubscribed) isSignalRequest_Message() {}
+func (*SignalRequest_Subscription) isSignalRequest_Message() {}
+
+func (*SignalRequest_TrackSetting) isSignalRequest_Message() {}
 
 type SignalResponse struct {
 	state         protoimpl.MessageState
@@ -920,12 +984,146 @@ func (x *SpeakerInfo) GetActive() bool {
 	return false
 }
 
+type UpdateSubscription struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	TrackSids []string     `protobuf:"bytes,1,rep,name=track_sids,json=trackSids,proto3" json:"track_sids,omitempty"`
+	Subscribe bool         `protobuf:"varint,2,opt,name=subscribe,proto3" json:"subscribe,omitempty"`
+	Mute      bool         `protobuf:"varint,3,opt,name=mute,proto3" json:"mute,omitempty"`
+	Quality   VideoQuality `protobuf:"varint,4,opt,name=quality,proto3,enum=livekit.VideoQuality" json:"quality,omitempty"`
+}
+
+func (x *UpdateSubscription) Reset() {
+	*x = UpdateSubscription{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_rtc_proto_msgTypes[12]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *UpdateSubscription) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*UpdateSubscription) ProtoMessage() {}
+
+func (x *UpdateSubscription) ProtoReflect() protoreflect.Message {
+	mi := &file_rtc_proto_msgTypes[12]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use UpdateSubscription.ProtoReflect.Descriptor instead.
+func (*UpdateSubscription) Descriptor() ([]byte, []int) {
+	return file_rtc_proto_rawDescGZIP(), []int{12}
+}
+
+func (x *UpdateSubscription) GetTrackSids() []string {
+	if x != nil {
+		return x.TrackSids
+	}
+	return nil
+}
+
+func (x *UpdateSubscription) GetSubscribe() bool {
+	if x != nil {
+		return x.Subscribe
+	}
+	return false
+}
+
+func (x *UpdateSubscription) GetMute() bool {
+	if x != nil {
+		return x.Mute
+	}
+	return false
+}
+
+func (x *UpdateSubscription) GetQuality() VideoQuality {
+	if x != nil {
+		return x.Quality
+	}
+	return VideoQuality_LOW
+}
+
+type UpdateTrackSettings struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	TrackSids []string     `protobuf:"bytes,1,rep,name=track_sids,json=trackSids,proto3" json:"track_sids,omitempty"`
+	Mute      bool         `protobuf:"varint,3,opt,name=mute,proto3" json:"mute,omitempty"`
+	Quality   VideoQuality `protobuf:"varint,4,opt,name=quality,proto3,enum=livekit.VideoQuality" json:"quality,omitempty"`
+}
+
+func (x *UpdateTrackSettings) Reset() {
+	*x = UpdateTrackSettings{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_rtc_proto_msgTypes[13]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *UpdateTrackSettings) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*UpdateTrackSettings) ProtoMessage() {}
+
+func (x *UpdateTrackSettings) ProtoReflect() protoreflect.Message {
+	mi := &file_rtc_proto_msgTypes[13]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use UpdateTrackSettings.ProtoReflect.Descriptor instead.
+func (*UpdateTrackSettings) Descriptor() ([]byte, []int) {
+	return file_rtc_proto_rawDescGZIP(), []int{13}
+}
+
+func (x *UpdateTrackSettings) GetTrackSids() []string {
+	if x != nil {
+		return x.TrackSids
+	}
+	return nil
+}
+
+func (x *UpdateTrackSettings) GetMute() bool {
+	if x != nil {
+		return x.Mute
+	}
+	return false
+}
+
+func (x *UpdateTrackSettings) GetQuality() VideoQuality {
+	if x != nil {
+		return x.Quality
+	}
+	return VideoQuality_LOW
+}
+
 var File_rtc_proto protoreflect.FileDescriptor
 
 var file_rtc_proto_rawDesc = []byte{
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+	0x76, 0x65, 0x6b, 0x69, 0x74, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -1051,54 +1273,60 @@ func file_rtc_proto_rawDescGZIP() []byte {
 	return file_rtc_proto_rawDescData
 }
 
-var file_rtc_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
-var file_rtc_proto_msgTypes = make([]protoimpl.MessageInfo, 12)
+var file_rtc_proto_enumTypes = make([]protoimpl.EnumInfo, 2)
+var file_rtc_proto_msgTypes = make([]protoimpl.MessageInfo, 14)
 var file_rtc_proto_goTypes = []interface{}{
 	(SignalTarget)(0),              // 0: livekit.SignalTarget
-	(*SignalRequest)(nil),          // 1: livekit.SignalRequest
-	(*SignalResponse)(nil),         // 2: livekit.SignalResponse
-	(*AddTrackRequest)(nil),        // 3: livekit.AddTrackRequest
-	(*TrickleRequest)(nil),         // 4: livekit.TrickleRequest
-	(*MuteTrackRequest)(nil),       // 5: livekit.MuteTrackRequest
-	(*NegotiationRequest)(nil),     // 6: livekit.NegotiationRequest
-	(*JoinResponse)(nil),           // 7: livekit.JoinResponse
-	(*TrackPublishedResponse)(nil), // 8: livekit.TrackPublishedResponse
-	(*SessionDescription)(nil),     // 9: livekit.SessionDescription
-	(*ParticipantUpdate)(nil),      // 10: livekit.ParticipantUpdate
-	(*ActiveSpeakerUpdate)(nil),    // 11: livekit.ActiveSpeakerUpdate
-	(*SpeakerInfo)(nil),            // 12: livekit.SpeakerInfo
-	(TrackType)(0),                 // 13: livekit.TrackType
-	(*Room)(nil),                   // 14: livekit.Room
-	(*ParticipantInfo)(nil),        // 15: livekit.ParticipantInfo
-	(*TrackInfo)(nil),              // 16: livekit.TrackInfo
+	(VideoQuality)(0),              // 1: livekit.VideoQuality
+	(*SignalRequest)(nil),          // 2: livekit.SignalRequest
+	(*SignalResponse)(nil),         // 3: livekit.SignalResponse
+	(*AddTrackRequest)(nil),        // 4: livekit.AddTrackRequest
+	(*TrickleRequest)(nil),         // 5: livekit.TrickleRequest
+	(*MuteTrackRequest)(nil),       // 6: livekit.MuteTrackRequest
+	(*NegotiationRequest)(nil),     // 7: livekit.NegotiationRequest
+	(*JoinResponse)(nil),           // 8: livekit.JoinResponse
+	(*TrackPublishedResponse)(nil), // 9: livekit.TrackPublishedResponse
+	(*SessionDescription)(nil),     // 10: livekit.SessionDescription
+	(*ParticipantUpdate)(nil),      // 11: livekit.ParticipantUpdate
+	(*ActiveSpeakerUpdate)(nil),    // 12: livekit.ActiveSpeakerUpdate
+	(*SpeakerInfo)(nil),            // 13: livekit.SpeakerInfo
+	(*UpdateSubscription)(nil),     // 14: livekit.UpdateSubscription
+	(*UpdateTrackSettings)(nil),    // 15: livekit.UpdateTrackSettings
+	(TrackType)(0),                 // 16: livekit.TrackType
+	(*Room)(nil),                   // 17: livekit.Room
+	(*ParticipantInfo)(nil),        // 18: livekit.ParticipantInfo
+	(*TrackInfo)(nil),              // 19: livekit.TrackInfo
 }
 var file_rtc_proto_depIdxs = []int32{
-	9,  // 0: livekit.SignalRequest.offer:type_name -> livekit.SessionDescription
-	9,  // 1: livekit.SignalRequest.answer:type_name -> livekit.SessionDescription
-	4,  // 2: livekit.SignalRequest.trickle:type_name -> livekit.TrickleRequest
-	3,  // 3: livekit.SignalRequest.add_track:type_name -> livekit.AddTrackRequest
-	5,  // 4: livekit.SignalRequest.mute:type_name -> livekit.MuteTrackRequest
-	5,  // 5: livekit.SignalRequest.mute_subscribed:type_name -> livekit.MuteTrackRequest
-	7,  // 6: livekit.SignalResponse.join:type_name -> livekit.JoinResponse
-	9,  // 7: livekit.SignalResponse.answer:type_name -> livekit.SessionDescription
-	9,  // 8: livekit.SignalResponse.offer:type_name -> livekit.SessionDescription
-	4,  // 9: livekit.SignalResponse.trickle:type_name -> livekit.TrickleRequest
-	10, // 10: livekit.SignalResponse.update:type_name -> livekit.ParticipantUpdate
-	8,  // 11: livekit.SignalResponse.track_published:type_name -> livekit.TrackPublishedResponse
-	11, // 12: livekit.SignalResponse.speaker:type_name -> livekit.ActiveSpeakerUpdate
-	13, // 13: livekit.AddTrackRequest.type:type_name -> livekit.TrackType
-	0,  // 14: livekit.TrickleRequest.target:type_name -> livekit.SignalTarget
-	14, // 15: livekit.JoinResponse.room:type_name -> livekit.Room
-	15, // 16: livekit.JoinResponse.participant:type_name -> livekit.ParticipantInfo
-	15, // 17: livekit.JoinResponse.other_participants:type_name -> livekit.ParticipantInfo
-	16, // 18: livekit.TrackPublishedResponse.track:type_name -> livekit.TrackInfo
-	15, // 19: livekit.ParticipantUpdate.participants:type_name -> livekit.ParticipantInfo
-	12, // 20: livekit.ActiveSpeakerUpdate.speakers:type_name -> livekit.SpeakerInfo
-	21, // [21:21] is the sub-list for method output_type
-	21, // [21:21] is the sub-list for method input_type
-	21, // [21:21] is the sub-list for extension type_name
-	21, // [21:21] is the sub-list for extension extendee
-	0,  // [0:21] is the sub-list for field type_name
+	10, // 0: livekit.SignalRequest.offer:type_name -> livekit.SessionDescription
+	10, // 1: livekit.SignalRequest.answer:type_name -> livekit.SessionDescription
+	5,  // 2: livekit.SignalRequest.trickle:type_name -> livekit.TrickleRequest
+	4,  // 3: livekit.SignalRequest.add_track:type_name -> livekit.AddTrackRequest
+	6,  // 4: livekit.SignalRequest.mute:type_name -> livekit.MuteTrackRequest
+	14, // 5: livekit.SignalRequest.subscription:type_name -> livekit.UpdateSubscription
+	15, // 6: livekit.SignalRequest.track_setting:type_name -> livekit.UpdateTrackSettings
+	8,  // 7: livekit.SignalResponse.join:type_name -> livekit.JoinResponse
+	10, // 8: livekit.SignalResponse.answer:type_name -> livekit.SessionDescription
+	10, // 9: livekit.SignalResponse.offer:type_name -> livekit.SessionDescription
+	5,  // 10: livekit.SignalResponse.trickle:type_name -> livekit.TrickleRequest
+	11, // 11: livekit.SignalResponse.update:type_name -> livekit.ParticipantUpdate
+	9,  // 12: livekit.SignalResponse.track_published:type_name -> livekit.TrackPublishedResponse
+	12, // 13: livekit.SignalResponse.speaker:type_name -> livekit.ActiveSpeakerUpdate
+	16, // 14: livekit.AddTrackRequest.type:type_name -> livekit.TrackType
+	0,  // 15: livekit.TrickleRequest.target:type_name -> livekit.SignalTarget
+	17, // 16: livekit.JoinResponse.room:type_name -> livekit.Room
+	18, // 17: livekit.JoinResponse.participant:type_name -> livekit.ParticipantInfo
+	18, // 18: livekit.JoinResponse.other_participants:type_name -> livekit.ParticipantInfo
+	19, // 19: livekit.TrackPublishedResponse.track:type_name -> livekit.TrackInfo
+	18, // 20: livekit.ParticipantUpdate.participants:type_name -> livekit.ParticipantInfo
+	13, // 21: livekit.ActiveSpeakerUpdate.speakers:type_name -> livekit.SpeakerInfo
+	1,  // 22: livekit.UpdateSubscription.quality:type_name -> livekit.VideoQuality
+	1,  // 23: livekit.UpdateTrackSettings.quality:type_name -> livekit.VideoQuality
+	24, // [24:24] is the sub-list for method output_type
+	24, // [24:24] is the sub-list for method input_type
+	24, // [24:24] is the sub-list for extension type_name
+	24, // [24:24] is the sub-list for extension extendee
+	0,  // [0:24] is the sub-list for field type_name
 }
 
 func init() { file_rtc_proto_init() }
@@ -1252,6 +1480,30 @@ func file_rtc_proto_init() {
 				return nil
 			}
 		}
+		file_rtc_proto_msgTypes[12].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*UpdateSubscription); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_rtc_proto_msgTypes[13].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*UpdateTrackSettings); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
 	}
 	file_rtc_proto_msgTypes[0].OneofWrappers = []interface{}{
 		(*SignalRequest_Offer)(nil),
@@ -1259,7 +1511,8 @@ func file_rtc_proto_init() {
 		(*SignalRequest_Trickle)(nil),
 		(*SignalRequest_AddTrack)(nil),
 		(*SignalRequest_Mute)(nil),
-		(*SignalRequest_MuteSubscribed)(nil),
+		(*SignalRequest_Subscription)(nil),
+		(*SignalRequest_TrackSetting)(nil),
 	}
 	file_rtc_proto_msgTypes[1].OneofWrappers = []interface{}{
 		(*SignalResponse_Join)(nil),
@@ -1275,8 +1528,8 @@ func file_rtc_proto_init() {
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_rtc_proto_rawDesc,
-			NumEnums:      1,
-			NumMessages:   12,
+			NumEnums:      2,
+			NumMessages:   14,
 			NumExtensions: 0,
 			NumServices:   0,
 		},

proto/rtc.proto

@@ -15,8 +15,10 @@ message SignalRequest {
     AddTrackRequest add_track = 4;
     // mute the participant's own tracks
     MuteTrackRequest mute = 5;
-    // mute a track client is subscribed to
-    MuteTrackRequest mute_subscribed = 6;
+    // Subscribe or unsubscribe from tracks
+    UpdateSubscription subscription = 6;
+    // Update settings of subscribed tracks
+    UpdateTrackSettings track_setting = 7;
   }
 }
 
@@ -97,3 +99,22 @@ message SpeakerInfo {
   // true if speaker is currently active
   bool active = 3;
 }
+
+enum VideoQuality {
+  LOW = 0;
+  MEDIUM = 1;
+  HIGH = 2;
+}
+
+message UpdateSubscription {
+  repeated string track_sids = 1;
+  bool subscribe = 2;
+  bool mute = 3;
+  VideoQuality quality = 4;
+}
+
+message UpdateTrackSettings {
+  repeated string track_sids = 1;
+  bool mute = 3;
+  VideoQuality quality = 4;
+}