設置AudioTrack時SessionDescription爲NULL

Question

我試圖構建一個WebRTC應用程序。

現在，我有這樣的：

PeerConnectionFactory.initializeAndroidGlobals(this, true); 
final PeerConnectionFactory pcFactory = new PeerConnectionFactory(null); 
final PeerConnection pc = pcFactory.createPeerConnection(ICE_SERVERS, MEDIA_CONSTRAINTS, new PeerConnection.Observer() { 
    private final String TAG = "WebRTC"; 

    @Override 
    public void onSignalingChange(final PeerConnection.SignalingState signalingState) { 
     Log.d(TAG, "Signaling change\t" + signalingState); 
    } 

    @Override 
    public void onIceConnectionChange(final PeerConnection.IceConnectionState iceConnectionState) { 
     Log.d(TAG, "ICE connection change\t" + iceConnectionState); 
    } 

    @Override 
    public void onIceConnectionReceivingChange(final boolean b) { 
     Log.d(TAG, "ICE connection receiving change\t" + b); 
    } 

    @Override 
    public void onIceGatheringChange(final PeerConnection.IceGatheringState iceGatheringState) { 
     Log.d(TAG, "ICE gathering change\t" + iceGatheringState); 
    } 

    @Override 
    public void onIceCandidate(final IceCandidate iceCandidate) { 
     Log.d(TAG, "ICE candidate\t" + iceCandidate); 
    } 

    @Override 
    public void onIceCandidatesRemoved(final IceCandidate[] iceCandidates) { 
     for (final IceCandidate iceCandidate : iceCandidates){ 
      Log.d(TAG, "ICE candidate removed\t" + iceCandidate); 
     } 
    } 

    @Override 
    public void onAddStream(final MediaStream mediaStream) { 
     Log.d(TAG, "Add stream\t" + mediaStream); 
    } 

    @Override 
    public void onRemoveStream(final MediaStream mediaStream) { 
     Log.d(TAG, "Remove stream\t" + mediaStream); 
    } 

    @Override 
    public void onDataChannel(final DataChannel dataChannel) { 
     Log.d(TAG, "Data channel\t" + dataChannel); 
    } 

    @Override 
    public void onRenegotiationNeeded() { 
     Log.d(TAG, "Renegotiation needed"); 
    } 

    @Override 
    public void onAddTrack(final RtpReceiver rtpReceiver, final MediaStream[] mediaStreams) { 
     for (final MediaStream mediaStream : mediaStreams) { 
      Log.d(TAG, "Add track\t" + rtpReceiver + "\t" + mediaStream); 
     } 
    } 
}); 
final AudioSource audioSource = pcFactory.createAudioSource(MEDIA_CONSTRAINTS); 
Assert.assertNotNull(audioSource); 
final AudioTrack audioTrack = pcFactory.createAudioTrack("Test Audio Track", audioSource); 
Assert.assertNotNull(audioTrack); 
final MediaStream localMS = pcFactory.createLocalMediaStream("Test Local Media Stream"); 
Assert.assertNotNull(localMS); 
Assert.assertTrue(localMS.addTrack(audioTrack)); 
Assert.assertTrue(pc.addStream(localMS)); 
pc.createOffer(new SdpObserver() { 
    private final String TAG = "WebRTC"; 

    @Override 
    public void onCreateSuccess(final SessionDescription sessionDescription) { 
     Log.d(TAG, "Create success\t" + sessionDescription.type + " " + sessionDescription.description); 
     pc.setLocalDescription(this, sessionDescription); 
    } 

    @Override 
    public void onSetSuccess() { 
     Log.d(TAG, "Set success"); 
    } 

    @Override 
    public void onCreateFailure(final String s) { 
     Log.d(TAG, "Create failure\t" + s); 
    } 

    @Override 
    public void onSetFailure(final String s) { 
     Log.d(TAG, "Set failure\t" + s); 
    } 
}, MEDIA_CONSTRAINTS); 

而這種失敗與以下日誌：

Set failure SessionDescription is NULL. 

然而，SessionDescription絕對不是null：

v=0 
o=- 1671888432286839529 2 IN IP4 127.0.0.1 
s=- 
t=0 0 
a=group:BUNDLE audio 
a=msid-semantic: WMS Test Local Media Stream 
m=audio 9 UDP/TLS/RTP/SAVPF 111 103 104 9 102 0 8 106 105 13 110 112 113 126 
c=IN IP4 0.0.0.0 
a=rtcp:9 IN IP4 0.0.0.0 
a=ice-ufrag:wxDK 
a=ice-pwd:VlshLQuefuFgJ244f8Oxn+00 
a=ice-options:trickle renomination 
a=fingerprint:sha-256 3E:A3:12:2D:2B:A4:A3:8E:F8:81:49:7D:1A:8B:30:32:EE:16:F4:C2:3E:60:53:28:70:F3:F9:5C:B6:1D:3F:FB 
a=setup:actpass 
a=mid:audio 
a=extmap:1 urn:ietf:params:rtp-hdrext:ssrc-audio-level 
a=sendrecv 
a=rtcp-mux 
a=rtpmap:111 opus/48000/2 
a=rtcp-fb:111 transport-cc 
a=fmtp:111 minptime=10;useinbandfec=1 
a=rtpmap:103 ISAC/16000 
a=rtpmap:104 ISAC/32000 
a=rtpmap:9 G722/8000 
a=rtpmap:102 ILBC/8000 
a=rtpmap:0 PCMU/8000 
a=rtpmap:8 PCMA/8000 
a=rtpmap:106 CN/32000 
a=rtpmap:105 CN/16000 
a=rtpmap:13 CN/8000 
a=rtpmap:110 telephone-event/48000 
a=rtpmap:112 telephone-event/32000 
a=rtpmap:113 telephone-event/16000 
a=rtpmap:126 telephone-event/8000 
a=ssrc:509420374 cname:x453Wkh4ZHn5LRuV 
a=ssrc:509420374 msid:Test Local Media Stream Test Audio Track 
a=ssrc:509420374 mslabel:Test Local Media Stream 
a=ssrc:509420374 label:Test Audio Track 

但是當我刪除音頻的東西，或整個MediaStream，描述成爲這樣：

v=0 
o=- 3918440358463799408 2 IN IP4 127.0.0.1 
s=- 
t=0 0 
a=msid-semantic: WMS 

它的工作原理。

任何想法可能是錯誤的？

Answer 1

AudioTrack and MediaStream ids must not contain spaces！

可能是因爲this。