Clean up down track type as it is not used (#265)

pkg/sfu/downtrack.go

@@ -30,14 +30,6 @@ type TrackSender interface {
 	PeerID() string
 }
 
-// DownTrackType determines the type of track
-type DownTrackType int
-
-const (
-	SimpleDownTrack DownTrackType = iota + 1
-	SimulcastDownTrack
-)
-
 const (
 	RTPPaddingMaxPayloadSize      = 255
 	RTPPaddingEstimatedHeaderSize = 20
@@ -87,7 +79,6 @@ type DownTrack struct {
 	maxTrack      int
 	payloadType   uint8
 	sequencer     *sequencer
-	trackType     DownTrackType
 	bufferFactory *buffer.Factory
 
 	forwarder *Forwarder
@@ -160,12 +151,6 @@ func NewDownTrack(c webrtc.RTPCodecCapability, r TrackReceiver, bf *buffer.Facto
 	d.rtxStats.Store(new(PacketStats))
 	d.paddingStats.Store(new(PacketStats))
 
-	if r.IsSimulcast() {
-		d.trackType = SimulcastDownTrack
-	} else {
-		d.trackType = SimpleDownTrack
-	}
-
 	return d, nil
 }
 

pkg/sfu/receiver.go

@@ -29,7 +29,6 @@ type TrackReceiver interface {
 	SendPLI(layer int32)
 	GetSenderReportTime(layer int32) (rtpTS uint32, ntpTS uint64)
 	Codec() webrtc.RTPCodecCapability
-	IsSimulcast() bool
 }
 
 // Receiver defines a interface for a track receivers
@@ -37,7 +36,6 @@ type Receiver interface {
 	TrackID() string
 	StreamID() string
 	Codec() webrtc.RTPCodecCapability
-	IsSimulcast() bool
 	AddUpTrack(track *webrtc.TrackRemote, buffer *buffer.Buffer)
 	AddDownTrack(track TrackSender)
 	SetUpTrackPaused(paused bool)