From ba5515a041b2fce20e9589afdc549f1b90457339 Mon Sep 17 00:00:00 2001
From: Alex Pokotilo <support@wmspanel.com>
Date: Tue, 26 Sep 2023 19:09:59 +0600
Subject: [PATCH] Create av1_sample_buffer_support_test.go

add tests for AV1PacketSampleBufferSupport
---
 codecs/av1_sample_buffer_support_test.go | 149 +++++++++++++++++++++++
 1 file changed, 149 insertions(+)
 create mode 100644 codecs/av1_sample_buffer_support_test.go

diff --git a/codecs/av1_sample_buffer_support_test.go b/codecs/av1_sample_buffer_support_test.go
new file mode 100644
index 0000000..6e8f0bb
--- /dev/null
+++ b/codecs/av1_sample_buffer_support_test.go
@@ -0,0 +1,149 @@
+package codecs
+
+import (
+	"bytes"
+	"github.com/pion/rtp"
+	"github.com/pion/rtp/pkg/obu"
+	"github.com/pion/webrtc/v3/pkg/media/samplebuilder"
+	"testing"
+	"time"
+)
+
+func buildAv1Payload(data byte, padding int) []byte {
+	dataSize := 0
+
+	if data > 0 {
+		dataSize = 1
+	}
+
+	payloadSize := obu.EncodeLEB128(uint(1 + padding + dataSize))
+	result := make([]byte, 3+sizeLeb128(payloadSize))
+
+	result[0] = 0 // AV1 RTP header
+
+	offset := 1
+
+	switch sizeLeb128(payloadSize) {
+	case 4:
+		result[offset] = byte(payloadSize >> 24)
+		offset++
+		fallthrough
+	case 3:
+		result[offset] = byte(payloadSize >> 16)
+		offset++
+		fallthrough
+	case 2:
+		result[offset] = byte(payloadSize >> 8)
+		offset++
+		fallthrough
+	case 1:
+		result[offset] = byte(payloadSize)
+		offset++
+	}
+
+	result[offset] = 0 // OBU HEADER
+
+	if dataSize > 0 {
+		offset++
+		result[offset] = data
+	}
+	return append(result, make([]byte, padding)...)
+}
+func buildAv1Packages(seqNo *uint16, timestamp *uint32, padding int) []*rtp.Packet {
+	s := *seqNo
+	t := *timestamp
+
+	*timestamp += 1800
+	*seqNo += 5
+
+	return []*rtp.Packet{
+		{Header: rtp.Header{SequenceNumber: s, Timestamp: t}, Payload: buildAv1Payload(1, 0)},
+		{Header: rtp.Header{SequenceNumber: s + 1, Timestamp: t}, Payload: buildAv1Payload(2, 0)},
+		{Header: rtp.Header{SequenceNumber: s + 2, Timestamp: t}, Payload: buildAv1Payload(3, 0)},
+		{Header: rtp.Header{SequenceNumber: s + 3, Timestamp: t}, Payload: buildAv1Payload(4, 0)},
+		{Header: rtp.Header{SequenceNumber: s + 4, Timestamp: t, Marker: true}, Payload: buildAv1Payload(5, padding)},
+	}
+}
+func TestAV1SampleBufferSupport(t *testing.T) {
+
+	assembledAv1Frame := []byte{2, 1, 1, 2, 1, 2, 2, 1, 3, 2, 1, 4, 2, 1, 5}
+	t.Run("AV1 Sample Buffer returning OBU stream", func(t *testing.T) {
+		videoStreamBuilder := samplebuilder.New(100, &AV1PacketSampleBufferSupport{}, 90000,
+			samplebuilder.WithMaxTimeDelay(time.Millisecond*100))
+		var seqNo uint16 = 0
+		var timestamp uint32 = 0
+
+		for i := 0; i < 4; i++ {
+			for _, pkt := range buildAv1Packages(&seqNo, &timestamp, 0) {
+				sample := videoStreamBuilder.Pop()
+				if nil != sample {
+					if !bytes.Equal(sample.Data, assembledAv1Frame) {
+						t.Fatal("issue in unmarshalling")
+					}
+				}
+				videoStreamBuilder.Push(pkt)
+			}
+		}
+
+		for i := 1; i < 16400; i++ { // check OBU len up to 3 bytes
+			for _, pkt := range buildAv1Packages(&seqNo, &timestamp, i) {
+				sample := videoStreamBuilder.Pop()
+				if nil != sample {
+
+					if !bytes.Equal(sample.Data[0:12], assembledAv1Frame[0:12]) {
+						t.Fatal("issue in unmarshalling")
+					}
+
+					if sample.Data[len(sample.Data)-i] != 5 {
+						t.Fatal("issue in unmarshalling")
+					}
+
+					if i > 0 {
+						padding := make([]byte, i-1)
+						if !bytes.Equal(sample.Data[len(sample.Data)-i+1:], padding) {
+							t.Fatal("issue in unmarshalling")
+						}
+					}
+				}
+				videoStreamBuilder.Push(pkt)
+			}
+		}
+	})
+}
+
+func buildHeaderOnlyAv1Packets(seqNo *uint16, timestamp *uint32, padding int) []*rtp.Packet {
+	s := *seqNo
+	t := *timestamp
+
+	*timestamp += 1800
+	*seqNo += 3
+
+	return []*rtp.Packet{
+		// Two header-only OBUs
+		{Header: rtp.Header{SequenceNumber: s, Timestamp: t}, Payload: buildAv1Payload(0, 0)},
+		{Header: rtp.Header{SequenceNumber: s + 1, Timestamp: t}, Payload: buildAv1Payload(0, 0)},
+		{Header: rtp.Header{SequenceNumber: s + 2, Timestamp: t, Marker: true}, Payload: buildAv1Payload(5, padding)},
+	}
+}
+
+func TestAV1SampleBufferSupport_OBUWIthoutPayload(t *testing.T) {
+	assembledAv1Frame := []byte{2, 0, 2, 0, 2, 1, 5}
+	t.Run("AV1 Sample Buffer with header only OBU elements", func(t *testing.T) {
+		videoStreamBuilder := samplebuilder.New(100, &AV1PacketSampleBufferSupport{}, 90000,
+			samplebuilder.WithMaxTimeDelay(time.Millisecond*100))
+		var seqNo uint16 = 0
+		var timestamp uint32 = 0
+
+		for i := 0; i < 4; i++ {
+			for _, pkt := range buildHeaderOnlyAv1Packets(&seqNo, &timestamp, 0) {
+				sample := videoStreamBuilder.Pop()
+				if nil != sample {
+					if !bytes.Equal(sample.Data, assembledAv1Frame) {
+						t.Fatal("issue in unmarshalling")
+					}
+				}
+				videoStreamBuilder.Push(pkt)
+			}
+		}
+	})
+}