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Fix AddTrack transceiver reuse per W3C specs #1861

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Fix AddTrack transceiver reuse per W3C specs #1861

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2 changes: 1 addition & 1 deletion peerconnection.go
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Original file line number Diff line number Diff line change
Expand Up @@ -1197,7 +1197,7 @@ func (pc *PeerConnection) AddTrack(track *Track) (*RTPSender, error) {

var transceiver *RTPTransceiver
for _, t := range pc.GetTransceivers() {
if !t.stopped && t.kind == track.Kind() && t.Sender() == nil {
if !t.stopped && t.kind == track.Kind() && t.Sender() == nil && t.usedToSend.Load() != true {
transceiver = t
break
}
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5 changes: 5 additions & 0 deletions rtptransceiver.go
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,8 @@ type RTPTransceiver struct {
receiver atomic.Value // *RTPReceiver
direction atomic.Value // RTPTransceiverDirection

usedToSend atomic.Value // track if direction has never had a value of "sendrecv" or "sendonly"

stopped bool
kind RTPCodecType
}
Expand Down Expand Up @@ -89,6 +91,9 @@ func (t *RTPTransceiver) setReceiver(r *RTPReceiver) {
}

func (t *RTPTransceiver) setDirection(d RTPTransceiverDirection) {
if d == RTPTransceiverDirectionSendrecv || d == RTPTransceiverDirectionSendonly {
t.usedToSend.Store(true)
}
t.direction.Store(d)
}

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