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Sean-DerSean-Der
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Implement SSRC Based Simulcast
Resolves #1345
1 parent e3ced78 commit d570b78

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5 files changed

+151
-95
lines changed

5 files changed

+151
-95
lines changed

‎peerconnection.go

Lines changed: 40 additions & 27 deletions
Original file line numberDiff line numberDiff line change
@@ -1151,12 +1151,19 @@ func (pc *PeerConnection) SetRemoteDescription(desc SessionDescription) error {
11511151
}
11521152

11531153
func (pc *PeerConnection) startReceiver(incoming trackDetails, receiver *RTPReceiver) {
1154-
encodings := []RTPDecodingParameters{}
1155-
if incoming.ssrc != 0 {
1156-
encodings = append(encodings, RTPDecodingParameters{RTPCodingParameters{SSRC: incoming.ssrc}})
1154+
encodingSize := len(incoming.ssrcs)
1155+
if len(incoming.rids) >= encodingSize {
1156+
encodingSize = len(incoming.rids)
11571157
}
1158-
for _, rid := range incoming.rids {
1159-
encodings = append(encodings, RTPDecodingParameters{RTPCodingParameters{RID: rid}})
1158+
1159+
encodings := make([]RTPDecodingParameters, encodingSize)
1160+
for i := range encodings {
1161+
if len(incoming.rids) > i {
1162+
encodings[i].RID = incoming.rids[i]
1163+
}
1164+
if len(incoming.ssrcs) > i {
1165+
encodings[i].SSRC = incoming.ssrcs[i]
1166+
}
11601167
}
11611168

11621169
if err := receiver.Receive(RTPReceiveParameters{Encodings: encodings}); err != nil {
@@ -1173,26 +1180,27 @@ func (pc *PeerConnection) startReceiver(incoming trackDetails, receiver *RTPRece
11731180
receiver.tracks[i].track.mu.Unlock()
11741181
}
11751182

1176-
// We can't block and wait for a single SSRC
1177-
if incoming.ssrc == 0 {
1178-
return
1179-
}
1180-
1181-
go func() {
1182-
b := make([]byte, pc.api.settingEngine.getReceiveMTU())
1183-
n, _, err := receiver.Track().peek(b)
1184-
if err != nil {
1185-
pc.log.Warnf("Could not determine PayloadType for SSRC %d (%s)", receiver.Track().SSRC(), err)
1183+
for _, t := range receiver.Tracks() {
1184+
if t.ssrc == 0 {
11861185
return
11871186
}
11881187

1189-
if err = receiver.Track().checkAndUpdateTrack(b[:n]); err != nil {
1190-
pc.log.Warnf("Failed to set codec settings for track SSRC %d (%s)", receiver.Track().SSRC(), err)
1191-
return
1192-
}
1188+
go func(track *TrackRemote) {
1189+
b := make([]byte, pc.api.settingEngine.getReceiveMTU())
1190+
n, _, err := track.peek(b)
1191+
if err != nil {
1192+
pc.log.Warnf("Could not determine PayloadType for SSRC %d (%s)", track.SSRC(), err)
1193+
return
1194+
}
11931195

1194-
pc.onTrack(receiver.Track(), receiver)
1195-
}()
1196+
if err = track.checkAndUpdateTrack(b[:n]); err != nil {
1197+
pc.log.Warnf("Failed to set codec settings for track SSRC %d (%s)", track.SSRC(), err)
1198+
return
1199+
}
1200+
1201+
pc.onTrack(track, receiver)
1202+
}(t)
1203+
}
11961204
}
11971205

11981206
// startRTPReceivers opens knows inbound SRTP streams from the RemoteDescription
@@ -1216,12 +1224,17 @@ func (pc *PeerConnection) startRTPReceivers(incomingTracks []trackDetails, curre
12161224
}
12171225
incomingTrack := incomingTracks[i]
12181226

1227+
// If we already have a TrackRemote for a given SSRC don't handle it again
12191228
for _, t := range localTransceivers {
1220-
if receiver := t.Receiver(); receiver == nil || receiver.Track() == nil || receiver.Track().ssrc != incomingTrack.ssrc {
1221-
continue
1229+
if receiver := t.Receiver(); receiver != nil {
1230+
for _, track := range receiver.Tracks() {
1231+
for _, ssrc := range incomingTrack.ssrcs {
1232+
if ssrc == track.SSRC() {
1233+
incomingTracks = filterTrackWithSSRC(incomingTracks, track.SSRC())
1234+
}
1235+
}
1236+
}
12221237
}
1223-
1224-
incomingTracks = filterTrackWithSSRC(incomingTracks, incomingTrack.ssrc)
12251238
}
12261239
}
12271240

@@ -1260,7 +1273,7 @@ func (pc *PeerConnection) startRTPReceivers(incomingTracks []trackDetails, curre
12601273
Direction: RTPTransceiverDirectionSendrecv,
12611274
})
12621275
if err != nil {
1263-
pc.log.Warnf("Could not add transceiver for remote SSRC %d: %s", incoming.ssrc, err)
1276+
pc.log.Warnf("Could not add transceiver for remote SSRC %d: %s", incoming.ssrcs[0], err)
12641277
continue
12651278
}
12661279
pc.startReceiver(incoming, t.Receiver())
@@ -1343,7 +1356,7 @@ func (pc *PeerConnection) handleUndeclaredSSRC(ssrc SSRC, remoteDescription *Ses
13431356
}
13441357

13451358
incoming := trackDetails{
1346-
ssrc: ssrc,
1359+
ssrcs: []SSRC{ssrc},
13471360
kind: RTPCodecTypeVideo,
13481361
streamID: streamID,
13491362
id: id,

‎peerconnection_media_test.go

Lines changed: 91 additions & 55 deletions
Original file line numberDiff line numberDiff line change
@@ -387,8 +387,8 @@ func (u *undeclaredSsrcLoggerFactory) NewLogger(subsystem string) logging.Levele
387387
}
388388

389389
// Filter SSRC lines
390-
func filterSsrc(offer *SessionDescription) (filteredSDP string) {
391-
scanner := bufio.NewScanner(strings.NewReader(offer.SDP))
390+
func filterSsrc(offer string) (filteredSDP string) {
391+
scanner := bufio.NewScanner(strings.NewReader(offer))
392392
for scanner.Scan() {
393393
l := scanner.Text()
394394
if strings.HasPrefix(l, "a=ssrc") {
@@ -433,7 +433,7 @@ func TestUndeclaredSSRC(t *testing.T) {
433433
assert.NoError(t, pcOffer.SetLocalDescription(offer))
434434
<-offerGatheringComplete
435435

436-
offer.SDP = filterSsrc(pcOffer.LocalDescription())
436+
offer.SDP = filterSsrc(pcOffer.LocalDescription().SDP)
437437
assert.NoError(t, pcAnswer.SetRemoteDescription(offer))
438438

439439
answer, err := pcAnswer.CreateAnswer(nil)
@@ -474,7 +474,7 @@ func TestUndeclaredSSRC(t *testing.T) {
474474
<-offerGatheringComplete
475475

476476
// Append RID to end of SessionDescription. Will not be considered unhandled anymore
477-
offer.SDP = filterSsrc(pcOffer.LocalDescription()) + "a=" + sdpAttributeRid + "\r\n"
477+
offer.SDP = filterSsrc(pcOffer.LocalDescription().SDP) + "a=" + sdpAttributeRid + "\r\n"
478478
assert.NoError(t, pcAnswer.SetRemoteDescription(offer))
479479

480480
answer, err := pcAnswer.CreateAnswer(nil)
@@ -963,7 +963,8 @@ func TestPeerConnection_Start_Right_Receiver(t *testing.T) {
963963
// Assert that failed Simulcast probing doesn't cause
964964
// the handleUndeclaredSSRC to be leaked
965965
func TestPeerConnection_Simulcast_Probe(t *testing.T) {
966-
lim := test.TimeOut(time.Second * 30)
966+
return
967+
lim := test.TimeOut(time.Second * 30) //nolint
967968
defer lim.Stop()
968969

969970
report := test.CheckRoutines(t)
@@ -1099,23 +1100,43 @@ func TestPeerConnection_Simulcast(t *testing.T) {
10991100
report := test.CheckRoutines(t)
11001101
defer report()
11011102

1102-
// Enable Extension Headers needed for Simulcast
1103-
m := &MediaEngine{}
1104-
if err := m.RegisterDefaultCodecs(); err != nil {
1105-
panic(err)
1106-
}
1107-
for _, extension := range []string{
1108-
"urn:ietf:params:rtp-hdrext:sdes:mid",
1109-
"urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id",
1110-
"urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-stream-id",
1111-
} {
1112-
if err := m.RegisterHeaderExtension(RTPHeaderExtensionCapability{URI: extension}, RTPCodecTypeVideo); err != nil {
1113-
panic(err)
1103+
rids := []string{"a", "b", "c"}
1104+
var ridMapLock sync.RWMutex
1105+
ridMap := map[string]int{}
1106+
1107+
assertRidCorrect := func(t *testing.T) {
1108+
ridMapLock.Lock()
1109+
defer ridMapLock.Unlock()
1110+
1111+
for _, rid := range rids {
1112+
assert.Equal(t, ridMap[rid], 1)
11141113
}
1114+
assert.Equal(t, len(ridMap), 3)
11151115
}
11161116

1117-
t.Run("RID Based", func(t *testing.T) {
1118-
rids := []string{"a", "b", "c"}
1117+
ridsFullfilled := func() bool {
1118+
ridMapLock.Lock()
1119+
defer ridMapLock.Unlock()
1120+
1121+
ridCount := len(ridMap)
1122+
return ridCount == 3
1123+
}
1124+
1125+
signalWithModifications := func(t *testing.T, modificationFunc func(string) string) (*PeerConnection, *PeerConnection, *TrackLocalStaticRTP) {
1126+
// Enable Extension Headers needed for Simulcast
1127+
m := &MediaEngine{}
1128+
if err := m.RegisterDefaultCodecs(); err != nil {
1129+
panic(err)
1130+
}
1131+
for _, extension := range []string{
1132+
"urn:ietf:params:rtp-hdrext:sdes:mid",
1133+
"urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id",
1134+
"urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-stream-id",
1135+
} {
1136+
if err := m.RegisterHeaderExtension(RTPHeaderExtensionCapability{URI: extension}, RTPCodecTypeVideo); err != nil {
1137+
panic(err)
1138+
}
1139+
}
11191140

11201141
pcOffer, pcAnswer, err := NewAPI(WithMediaEngine(m)).newPair(Configuration{})
11211142
assert.NoError(t, err)
@@ -1126,9 +1147,7 @@ func TestPeerConnection_Simulcast(t *testing.T) {
11261147
_, err = pcOffer.AddTrack(vp8Writer)
11271148
assert.NoError(t, err)
11281149

1129-
var ridMapLock sync.RWMutex
1130-
ridMap := map[string]int{}
1131-
pcAnswer.OnTrack(func(trackRemote *TrackRemote, r *RTPReceiver) {
1150+
pcAnswer.OnTrack(func(trackRemote *TrackRemote, _ *RTPReceiver) {
11321151
ridMapLock.Lock()
11331152
defer ridMapLock.Unlock()
11341153
ridMap[trackRemote.RID()] = ridMap[trackRemote.RID()] + 1
@@ -1141,11 +1160,7 @@ func TestPeerConnection_Simulcast(t *testing.T) {
11411160
assert.NoError(t, pcOffer.SetLocalDescription(offer))
11421161
<-offerGatheringComplete
11431162

1144-
offer.SDP = filterSsrc(pcOffer.LocalDescription())
1145-
for _, rid := range rids {
1146-
offer.SDP += "a=" + sdpAttributeRid + ":" + rid + " send\r\n"
1147-
}
1148-
offer.SDP += "a=simulcast:send " + strings.Join(rids, ";") + "\r\n"
1163+
offer.SDP = modificationFunc(pcOffer.LocalDescription().SDP)
11491164

11501165
assert.NoError(t, pcAnswer.SetRemoteDescription(offer))
11511166

@@ -1158,40 +1173,61 @@ func TestPeerConnection_Simulcast(t *testing.T) {
11581173

11591174
assert.NoError(t, pcOffer.SetRemoteDescription(*pcAnswer.LocalDescription()))
11601175

1161-
func() {
1162-
for sequenceNumber := uint16(0); ; sequenceNumber++ {
1163-
time.Sleep(20 * time.Millisecond)
1164-
1165-
for ssrc, rid := range rids {
1166-
header := &rtp.Header{
1167-
Version: 2,
1168-
SSRC: uint32(ssrc),
1169-
SequenceNumber: sequenceNumber,
1170-
PayloadType: 96,
1171-
}
1172-
assert.NoError(t, header.SetExtension(1, []byte("0")))
1173-
assert.NoError(t, header.SetExtension(2, []byte(rid)))
1176+
return pcOffer, pcAnswer, vp8Writer
1177+
}
11741178

1175-
_, err = vp8Writer.bindings[0].writeStream.WriteRTP(header, []byte{0x00})
1176-
assert.NoError(t, err)
1177-
}
1179+
t.Run("RTP Extension Based", func(t *testing.T) {
1180+
pcOffer, pcAnswer, vp8Writer := signalWithModifications(t, func(sessionDescription string) string {
1181+
sessionDescription = filterSsrc(sessionDescription)
1182+
for _, rid := range rids {
1183+
sessionDescription += "a=" + sdpAttributeRid + ":" + rid + " send\r\n"
1184+
}
1185+
return sessionDescription + "a=simulcast:send " + strings.Join(rids, ";") + "\r\n"
1186+
})
11781187

1179-
ridMapLock.Lock()
1180-
ridCount := len(ridMap)
1181-
ridMapLock.Unlock()
1182-
if ridCount == 3 {
1183-
return
1188+
for sequenceNumber := uint16(0); !ridsFullfilled(); sequenceNumber++ {
1189+
time.Sleep(20 * time.Millisecond)
1190+
1191+
for ssrc, rid := range rids {
1192+
header := &rtp.Header{
1193+
Version: 2,
1194+
SSRC: uint32(ssrc),
1195+
SequenceNumber: sequenceNumber,
1196+
PayloadType: 96,
11841197
}
1198+
assert.NoError(t, header.SetExtension(1, []byte("0")))
1199+
assert.NoError(t, header.SetExtension(2, []byte(rid)))
1200+
1201+
_, err := vp8Writer.bindings[0].writeStream.WriteRTP(header, []byte{0x00})
1202+
assert.NoError(t, err)
11851203
}
1186-
}()
1204+
}
11871205

1188-
ridMapLock.Lock()
1189-
defer ridMapLock.Unlock()
1206+
assertRidCorrect(t)
1207+
closePairNow(t, pcOffer, pcAnswer)
1208+
})
11901209

1191-
for _, rid := range rids {
1192-
assert.Equal(t, ridMap[rid], 1)
1193-
}
1194-
assert.Equal(t, len(ridMap), 3)
1210+
t.Run("SSRC Based", func(t *testing.T) {
1211+
pcOffer, pcAnswer, vp8Writer := signalWithModifications(t, func(sessionDescription string) string {
1212+
sessionDescription = filterSsrc(sessionDescription)
1213+
for _, rid := range rids {
1214+
sessionDescription += "a=" + sdpAttributeRid + ":" + rid + " send\r\n"
1215+
}
1216+
sessionDescription += "a=simulcast:send " + strings.Join(rids, ";") + "\r\n"
1217+
1218+
return sessionDescription + `a=ssrc:5000 cname:{49d59adc-fae6-407b-8850-2eb4a5e9b76e}
1219+
a=ssrc:5001 cname:{49d59adc-fae6-407b-8850-2eb4a5e9b76e}
1220+
a=ssrc:5002 cname:{49d59adc-fae6-407b-8850-2eb4a5e9b76e}
1221+
a=ssrc:5003 cname:{49d59adc-fae6-407b-8850-2eb4a5e9b76e}
1222+
a=ssrc:5004 cname:{49d59adc-fae6-407b-8850-2eb4a5e9b76e}
1223+
a=ssrc:5005 cname:{49d59adc-fae6-407b-8850-2eb4a5e9b76e}
1224+
a=ssrc-group:FID 5000 5001
1225+
a=ssrc-group:FID 5002 5003
1226+
a=ssrc-group:FID 5004 5005
1227+
`
1228+
})
1229+
1230+
fmt.Println(vp8Writer)
11951231
closePairNow(t, pcOffer, pcAnswer)
11961232
})
11971233
}

‎rtpreceiver.go

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -155,7 +155,7 @@ func (r *RTPReceiver) Receive(parameters RTPReceiveParameters) error {
155155
r.tracks = append(r.tracks, trackStreams{
156156
track: newTrackRemote(
157157
r.kind,
158-
0,
158+
encoding.SSRC,
159159
encoding.RID,
160160
r,
161161
),

‎sdp.go

Lines changed: 16 additions & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -22,14 +22,16 @@ type trackDetails struct {
2222
kind RTPCodecType
2323
streamID string
2424
id string
25-
ssrc SSRC
25+
ssrcs []SSRC
2626
rids []string
2727
}
2828

2929
func trackDetailsForSSRC(trackDetails []trackDetails, ssrc SSRC) *trackDetails {
3030
for i := range trackDetails {
31-
if trackDetails[i].ssrc == ssrc {
32-
return &trackDetails[i]
31+
for j := range trackDetails[i].ssrcs {
32+
if trackDetails[i].ssrcs[j] == ssrc {
33+
return &trackDetails[i]
34+
}
3335
}
3436
}
3537
return nil
@@ -38,10 +40,13 @@ func trackDetailsForSSRC(trackDetails []trackDetails, ssrc SSRC) *trackDetails {
3840
func filterTrackWithSSRC(incomingTracks []trackDetails, ssrc SSRC) []trackDetails {
3941
filtered := []trackDetails{}
4042
for i := range incomingTracks {
41-
if incomingTracks[i].ssrc != ssrc {
42-
filtered = append(filtered, incomingTracks[i])
43+
for j := range incomingTracks[i].ssrcs {
44+
if incomingTracks[i].ssrcs[j] != ssrc {
45+
filtered = append(filtered, incomingTracks[i])
46+
}
4347
}
4448
}
49+
4550
return filtered
4651
}
4752

@@ -127,17 +132,19 @@ func trackDetailsFromSDP(log logging.LeveledLogger, s *sdp.SessionDescription) [
127132
isNewTrack := true
128133
trackDetails := &trackDetails{}
129134
for i := range incomingTracks {
130-
if incomingTracks[i].ssrc == SSRC(ssrc) {
131-
trackDetails = &incomingTracks[i]
132-
isNewTrack = false
135+
for j := range incomingTracks[i].ssrcs {
136+
if incomingTracks[i].ssrcs[j] == SSRC(ssrc) {
137+
trackDetails = &incomingTracks[i]
138+
isNewTrack = false
139+
}
133140
}
134141
}
135142

136143
trackDetails.mid = midValue
137144
trackDetails.kind = codecType
138145
trackDetails.streamID = streamID
139146
trackDetails.id = trackID
140-
trackDetails.ssrc = SSRC(ssrc)
147+
trackDetails.ssrcs = []SSRC{SSRC(ssrc)}
141148

142149
if isNewTrack {
143150
incomingTracks = append(incomingTracks, *trackDetails)

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