snapshot of https://github.com/livekit/livekit.git @ 08c5433449c106943231037d0b892895f6e92d3b (2026-09-15)

pkg/sfu/pacer/pacer.go

@@ -0,0 +1,77 @@
+// Copyright 2023 LiveKit, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package pacer
+
+import (
+	"sync"
+	"time"
+
+	"github.com/livekit/livekit-server/pkg/sfu/ccutils"
+	"github.com/pion/rtp"
+	"github.com/pion/webrtc/v4"
+)
+
+var (
+	PacketFactory = &sync.Pool{
+		New: func() any {
+			return &Packet{}
+		},
+	}
+)
+
+// --------------------------------------
+
+type PacerBehavior string
+
+const (
+	PacerBehaviorPassThrough PacerBehavior = "pass-through"
+	PacerBehaviorNoQueue     PacerBehavior = "no-queue"
+	PacerBehaviorLeakybucket PacerBehavior = "leaky-bucket"
+)
+
+type Packet struct {
+	Header             *rtp.Header
+	HeaderPool         *sync.Pool
+	HeaderSize         int
+	Payload            []byte
+	IsRTX              bool
+	ProbeClusterId     ccutils.ProbeClusterId
+	IsProbe            bool
+	AbsSendTimeExtID   uint8
+	TransportWideExtID uint8
+	WriteStream        webrtc.TrackLocalWriter
+	Pool               *sync.Pool
+	PoolEntity         *[]byte
+}
+
+type Pacer interface {
+	Enqueue(p *Packet)
+	Stop()
+
+	SetInterval(interval time.Duration)
+	SetBitrate(bitrate int)
+
+	TimeSinceLastSentPacket() time.Duration
+
+	SetPacerProbeObserverListener(listener PacerProbeObserverListener)
+	StartProbeCluster(pci ccutils.ProbeClusterInfo)
+	EndProbeCluster(probeClusterId ccutils.ProbeClusterId) ccutils.ProbeClusterInfo
+}
+
+type PacerProbeObserverListener interface {
+	OnPacerProbeObserverClusterComplete(probeClusterId ccutils.ProbeClusterId)
+}
+
+// ------------------------------------------------