webrtc android- createpeerconnection()总是返回null

Question

我是Android和WebRTC的新手，我一直在努力在网站和我的Android设备之间获得P2P视频连接。我已经在两个网站之间得到了工作，所以我很确定我的问题在于Android方面。

当我尝试使用peerconnectionfactory.createpeerconnection((创建一个新的peerConnection对象时，结果始终为null。我正在使用webrtc的释放Vesion M58。

PeerConnection.IceServer iceServer = new PeerConnection.IceServer("http://stun.stun.l.google.com:19302/");
List<PeerConnection.IceServer> servers = new ArrayList<PeerConnection.IceServer>();
servers.add(iceServer);
// Media Constraints
final MediaConstraints mediaConstraints = new MediaConstraints();
mediaConstraints.mandatory.add(new MediaConstraints.KeyValuePair("OfferToReceiveAudio", "true"));
mediaConstraints.mandatory.add(new MediaConstraints.KeyValuePair("OfferToReceiveVideo", "true"));
mediaConstraints.optional.add(new MediaConstraints.KeyValuePair("DtlsSrtpKeyAgreement", "true"));
// Set up remote rendering stuff
rootEGLBase = EglBase.create();
svr = (SurfaceViewRenderer) findViewById(R.id.remote_video);
svr.init(rootEGLBase.getEglBaseContext(), null);
svr.setScalingType(RendererCommon.ScalingType.SCALE_ASPECT_FIT);
svr.setZOrderMediaOverlay(true);
svr.setEnableHardwareScaler(true);
remoteProxyRenderer.setTarget(svr);
remoteRender = remoteProxyRenderer;
// Create a peer connection factory
PeerConnectionFactory.initializeAndroidGlobals(this.ctx, true);
PeerConnectionFactory.Options options = new PeerConnectionFactory.Options();
options.networkIgnoreMask = 0;
PeerConnectionFactory peerConnectionFactory = new PeerConnectionFactory(options);
// wait until my websocket has connected
System.out.println("waiting for websocket to be inited...");
while (this.ws == null);
System.out.println("done wait");
final WebSocket in_scope_ws = this.ws;
// create peer connection observer
PeerConnection.Observer pcObserver = new PeerConnection.Observer() {/* not included - mostly just prints */};
// Create peerconnection
final PeerConnection peerConnection = peerConnectionFactory.createPeerConnection(servers, mediaConstraints, pcObserver);

这是我从上面代码中删除的peerconnection.Observer匿名实现。我敢肯定，我在这里做了很多其他事情，但是我想我要等待这个问题，直到我首先使用要约/答案交换为止。

PeerConnection.Observer pcObserver = new PeerConnection.Observer() {
    final String TAG = "PEER_CONNECTION_FACTORY";
    @Override
    public void onSignalingChange(PeerConnection.SignalingState signalingState) {
        Log.d(TAG, "onSignalingChange");
    }
    @Override
    public void onIceConnectionChange(PeerConnection.IceConnectionState iceConnectionState) {
        Log.d(TAG, "onIceConnectionChange");
    }
    @Override
    public void onIceConnectionReceivingChange(boolean b) {
        Log.d(TAG, "onIceConnectionReceivingChange");
    }
    @Override
    public void onIceGatheringChange(PeerConnection.IceGatheringState iceGatheringState) {
        Log.d(TAG, "onIceGatheringChange");
    }
    // not sure what to put here
    @Override
    public void onIceCandidate(IceCandidate iceCandidate) {
        System.out.println("AN ICE CANDIDATE HAS BEEN DISCOVERED");
        if (iceCandidate != null && in_scope_ws != null) {
            try {
                JSONObject payload = new JSONObject();
                payload.put("sdpMLineIndex", iceCandidate.sdpMLineIndex);
                payload.put("sdpMid", iceCandidate.sdpMid);
                payload.put("candidate", iceCandidate.sdp);
                JSONObject candidateObject = new JSONObject();
                candidateObject.put("ice", iceCandidate.toString());
                in_scope_ws.sendText(candidateObject.toString());
            } catch (JSONException e) {
                e.printStackTrace();
            }
            //send ice candidate to server - probably need to convert to string and put in JSON object
//                    in_scope_ws.send("")
        }
    }
    @Override
    public void onIceCandidatesRemoved(IceCandidate[] iceCandidates) {
        Log.d(TAG, "onIceCandidatesRemoved");
    }
    // pretty sure this is the only garbage I need right now
    @Override
    public void onAddStream(MediaStream mediaStream) {
        System.out.println("IN ADD STREAM");
        if(mediaStream.videoTracks.size()==0) {
            Log.d("onAddStream", "NO REMOTE STREAM");
            System.out.println("NO REMOTE STREAM (PRINTLN)");
        }
        mediaStream.videoTracks.get(0).addRenderer(new VideoRenderer (remoteRender));
//                VideoRendererGui.update(remoteRender, 0, 0, 100, 100, RendererCommon.ScalingType.SCALE_ASPECT_FILL, false);
    }
    @Override
    public void onRemoveStream(MediaStream mediaStream) {
        Log.d(TAG, "onRemoveStream");
    }
    @Override
    public void onDataChannel(DataChannel dataChannel) {
        Log.d(TAG, "onDataChannel");
    }
    @Override
    public void onRenegotiationNeeded() {
        Log.d(TAG, "onRenegotiationNeeded");
    }
    @Override
    public void onAddTrack(RtpReceiver rtpReceiver, MediaStream[] mediaStreams) { Log.d(TAG, "onAddTrack"); }
};

Answer 1

createPeerConnection()返回null的另一个问题可能是错误的 IceServer配置，请确保设置正确的 IceServer和正确的凭据。

Answer 2

您可以启用详细记录以跟踪问题。

org.webrtc.Logging.enableLogToDebugOutput(Logging.Severity.LS_VERBOSE);

还确保您已授予所需的运行时权限(相机，record_autdio(

Answer 3

您需要createLocalMediastream并设置Video Height videowidth，CreateVideOsource，createAudiosource在您创建之前。

Answer 4

我也有同样的问题。peerconnection对象总是以null为单位。

就我而言，未设置了转向服务器之一的用户名。设置该设置后，成功创建了PeerConnection对象。

val servers = listOf(
...,    
PeerConnection.IceServer.builder("server_url")
                .setUsername("user_name")
                .setPassword("password")
                .createIceServer()
...
        ) as MutableList<PeerConnection.IceServer>