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

pkg/sfu/playoutdelay_test.go

@@ -0,0 +1,81 @@
+// Copyright 2024 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 sfu
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+
+	pd "github.com/livekit/livekit-server/pkg/sfu/rtpextension/playoutdelay"
+	"github.com/livekit/livekit-server/pkg/sfu/rtpstats"
+	"github.com/livekit/protocol/logger"
+)
+
+func TestPlayoutDelay(t *testing.T) {
+	stats := rtpstats.NewRTPStatsSender(rtpstats.RTPStatsParams{}, 128)
+	stats.SetClockRate(90000)
+
+	c, err := NewPlayoutDelayController(100, 120, logger.GetLogger(), stats)
+	require.NoError(t, err)
+
+	ext := c.GetDelayExtension(100)
+	playoutDelayEqual(t, ext, 100, 120)
+
+	ext = c.GetDelayExtension(105)
+	playoutDelayEqual(t, ext, 100, 120)
+
+	// seq acked before delay changed
+	c.OnSeqAcked(65534)
+	ext = c.GetDelayExtension(105)
+	playoutDelayEqual(t, ext, 100, 120)
+
+	c.OnSeqAcked(90)
+	ext = c.GetDelayExtension(105)
+	playoutDelayEqual(t, ext, 100, 120)
+
+	// seq acked, no extension sent for new packet
+	c.OnSeqAcked(103)
+	ext = c.GetDelayExtension(106)
+	require.Nil(t, ext)
+
+	// delay on change(can't go below min), no extension sent
+	c.SetJitter(0)
+	ext = c.GetDelayExtension(107)
+	require.Nil(t, ext)
+
+	// delay changed, generate new extension to send
+	time.Sleep(200 * time.Millisecond)
+	c.SetJitter(50)
+	t.Log(c.currentDelay, c.state.Load())
+	ext = c.GetDelayExtension(108)
+	var delay pd.PlayOutDelay
+	require.NoError(t, delay.Unmarshal(ext))
+	require.Greater(t, delay.Min, uint16(100))
+
+	// can't go above max
+	time.Sleep(200 * time.Millisecond)
+	c.SetJitter(10000)
+	ext = c.GetDelayExtension(109)
+	playoutDelayEqual(t, ext, 120, 120)
+}
+
+func playoutDelayEqual(t *testing.T, data []byte, min, max uint16) {
+	var delay pd.PlayOutDelay
+	require.NoError(t, delay.Unmarshal(data))
+	require.Equal(t, min, delay.Min)
+	require.Equal(t, max, delay.Max)
+}