fix webrtc/VP9 tests (#3443)

internal/servers/webrtc/server_test.go

@@ -26,10 +26,6 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
-func uint16Ptr(v uint16) *uint16 {
-	return &v
-}
-
 func checkClose(t *testing.T, closeFunc func() error) {
 	require.NoError(t, closeFunc())
 }
@@ -357,8 +353,7 @@ func TestServerRead(t *testing.T) {
 			},
 			[]byte{0, 2, 1, 2},
 		},
-		// TODO: check why this doesn't work
-		/*{
+		{
 			"vp9",
 			[]*description.Media{{
 				Type: description.MediaTypeVideo,
@@ -367,10 +362,14 @@ func TestServerRead(t *testing.T) {
 				}},
 			}},
 			&unit.VP9{
-				Frame: []byte{1, 2},
+				Frame: []byte{0x82, 0x49, 0x83, 0x42, 0x0, 0x77, 0xf0, 0x32, 0x34},
 			},
-			[]byte{1, 2},
-		},*/
+			[]byte{
+				0x8f, 0xa0, 0xfd, 0x18, 0x07, 0x80, 0x03, 0x24,
+				0x01, 0x14, 0x01, 0x82, 0x49, 0x83, 0x42, 0x00,
+				0x77, 0xf0, 0x32, 0x34,
+			},
+		},
 		{
 			"vp8",
 			[]*description.Media{{

internal/servers/webrtc/session.go

@@ -35,10 +35,14 @@ import (
 )
 
 var errNoSupportedCodecs = errors.New(
-	"the stream doesn't contain any supported codec, which are currently AV1, VP9, VP8, H264, Opus, G722, G711")
+	"the stream doesn't contain any supported codec, which are currently AV1, VP9, VP8, H264, Opus, G722, G711, LPCM")
 
 type setupStreamFunc func(*webrtc.OutgoingTrack) error
 
+func uint16Ptr(v uint16) *uint16 {
+	return &v
+}
+
 func findVideoTrack(
 	stream *stream.Stream,
 	writer *asyncwriter.Writer,
@@ -87,8 +91,9 @@ func findVideoTrack(
 	if vp9Format != nil {
 		return vp9Format, func(track *webrtc.OutgoingTrack) error {
 			encoder := &rtpvp9.Encoder{
-				PayloadType:    96,
-				PayloadMaxSize: webrtcPayloadMaxSize,
+				PayloadType:      96,
+				PayloadMaxSize:   webrtcPayloadMaxSize,
+				InitialPictureID: uint16Ptr(8445),
 			}
 			err := encoder.Init()
 			if err != nil {