Fix RTPSendParameters

RTPSendParameters contains an array of encodings.
RTPSender.GetParameters returns RTPSendParameters.

peerconnection.go

@@ -1236,12 +1236,14 @@ func (pc *PeerConnection) startRTPSenders(currentTransceivers []*RTPTransceiver)
 	for _, transceiver := range currentTransceivers {
 		if transceiver.Sender() != nil && transceiver.Sender().isNegotiated() && !transceiver.Sender().hasSent() {
 			err := transceiver.Sender().Send(RTPSendParameters{
-				Encodings: RTPEncodingParameters{
+				Encodings: []RTPEncodingParameters{
+					{
 						RTPCodingParameters{
 							SSRC:        transceiver.Sender().ssrc,
 							PayloadType: transceiver.Sender().payloadType,
 						},
 					},
+				},
 			})
 			if err != nil {
 				return err

rtpsender.go

@@ -92,8 +92,21 @@ func (r *RTPSender) Transport() *DTLSTransport {
 
 // GetParameters describes the current configuration for the encoding and
 // transmission of media on the sender's track.
-func (r *RTPSender) GetParameters() RTPParameters {
-	return r.api.mediaEngine.getRTPParametersByKind(r.track.Kind(), []RTPTransceiverDirection{RTPTransceiverDirectionSendonly})
+func (r *RTPSender) GetParameters() RTPSendParameters {
+	return RTPSendParameters{
+		RTPParameters: r.api.mediaEngine.getRTPParametersByKind(
+			r.track.Kind(),
+			[]RTPTransceiverDirection{RTPTransceiverDirectionSendonly},
+		),
+		Encodings: []RTPEncodingParameters{
+			{
+				RTPCodingParameters: RTPCodingParameters{
+					SSRC:        r.ssrc,
+					PayloadType: r.payloadType,
+				},
+			},
+		},
+	}
 }
 
 // Track returns the RTCRtpTransceiver track, or nil
@@ -148,7 +161,7 @@ func (r *RTPSender) Send(parameters RTPSendParameters) error {
 	r.context = TrackLocalContext{
 		id:          r.id,
 		params:      r.api.mediaEngine.getRTPParametersByKind(r.track.Kind(), []RTPTransceiverDirection{RTPTransceiverDirectionSendonly}),
-		ssrc:        parameters.Encodings.SSRC,
+		ssrc:        parameters.Encodings[0].SSRC,
 		writeStream: writeStream,
 	}
 

rtpsender_test.go

@@ -134,3 +134,27 @@ func Test_RTPSender_ReplaceTrack(t *testing.T) {
 		assert.NoError(t, receiver.Close())
 	})
 }
+
+func Test_RTPSender_GetParameters(t *testing.T) {
+	lim := test.TimeOut(time.Second * 10)
+	defer lim.Stop()
+
+	report := test.CheckRoutines(t)
+	defer report()
+
+	offerer, answerer, err := newPair()
+	assert.NoError(t, err)
+
+	rtpTransceiver, err := offerer.AddTransceiverFromKind(RTPCodecTypeVideo)
+	assert.NoError(t, err)
+
+	assert.NoError(t, signalPair(offerer, answerer))
+
+	parameters := rtpTransceiver.Sender().GetParameters()
+	assert.NotEqual(t, 0, len(parameters.Codecs))
+	assert.Equal(t, 1, len(parameters.Encodings))
+	assert.Equal(t, rtpTransceiver.Sender().ssrc, parameters.Encodings[0].SSRC)
+
+	assert.NoError(t, offerer.Close())
+	assert.NoError(t, answerer.Close())
+}

rtpsendparameters.go

@@ -2,5 +2,6 @@ package webrtc
 
 // RTPSendParameters contains the RTP stack settings used by receivers
 type RTPSendParameters struct {
-	Encodings RTPEncodingParameters
+	RTPParameters
+	Encodings []RTPEncodingParameters
 }