无法在webrtc android客户端中添加远程会话描述
服务器响应：
{ "rtcid": "wKAm8eeyI-mQ5dsslkhu", "msgType": "offer", "senderrtcid": "53wp_LP5CYDie3eIlkhw", "msgData": { "type": "offer", "sdp": "v=0\r\no=- 951920257545056255 2 IN IP4 127.0.0.1\r\ns=-\r\nt=0 0\r\na=group:BUNDLE audio video\r\na=msid-semantic: WMS OfkjcHABgxUkHlk8mfJ8ayYZdCHqdpQGFSTM\r\nm=audio 1 RTP/SAVPF 111 103 104 0 8 106 105 13 126\r\nc=IN IP4 0.0.0.0\r\na=rtcp:1 IN IP4 0.0.0.0\r\na=ice-ufrag:CF4q+RW54gQVPaz0\r\na=ice-pwd:hEIbgX4MME6cPkZKGih7bjQM\r\na=ice-options:google-ice\r\na=fingerprint:sha-256 1E:7F:B8:BA:1A:8D:76:BE:A9:A5:A3:9D:59:3E:CC:BD:1B:90:7B:89:EF:F0:03:B3:9A:CA:9C:07:02:97:53:6F\r\na=setup:actpass\r\na=mid:audio\r\na=extmap:1 urn:ietf:params:rtp-hdrext:ssrc-audio-level\r\na=extmap:3 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time\r\na=sendrecv\r\na=rtcp-mux\r\na=rtpmap:111 opus/48000/2\r\na=fmtp:111 minptime=10\r\na=rtpmap:103 ISAC/16000\r\na=rtpmap:104 ISAC/32000\r\na=rtpmap:0 PCMU/8000\r\na=rtpmap:8 PCMA/8000\r\na=rtpmap:106 CN/32000\r\na=rtpmap:105 CN/16000\r\na=rtpmap:13 CN/8000\r\na=rtpmap:126 telephone-event/8000\r\na=maxptime:60\r\na=ssrc:777379316 cname:Dl+cb/nGYCzEcTvH\r\na=ssrc:777379316 msid:OfkjcHABgxUkHlk8mfJ8ayYZdCHqdpQGFSTM 0937b040-5691-4ae3-b533-dd9ce82c4393\r\na=ssrc:777379316 mslabel:OfkjcHABgxUkHlk8mfJ8ayYZdCHqdpQGFSTM\r\na=ssrc:777379316 label:0937b040-5691-4ae3-b533-dd9ce82c4393\r\nm=video 1 RTP/SAVPF 100 116 117 96\r\nc=IN IP4 0.0.0.0\r\na=rtcp:1 IN IP4 0.0.0.0\r\na=ice-ufrag:CF4q+RW54gQVPaz0\r\na=ice-pwd:hEIbgX4MME6cPkZKGih7bjQM\r\na=ice-options:google-ice\r\na=fingerprint:sha-256 1E:7F:B8:BA:1A:8D:76:BE:A9:A5:A3:9D:59:3E:CC:BD:1B:90:7B:89:EF:F0:03:B3:9A:CA:9C:07:02:97:53:6F\r\na=setup:actpass\r\na=mid:video\r\na=extmap:2 urn:ietf:params:rtp-hdrext:toffset\r\na=extmap:3 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time\r\na=sendrecv\r\na=rtcp-mux\r\na=rtpmap:100 VP8/90000\r\na=rtcp-fb:100 ccm fir\r\na=rtcp-fb:100 nack\r\na=rtcp-fb:100 nack pli\r\na=rtcp-fb:100 goog-remb\r\na=rtpmap:116 red/90000\r\na=rtpmap:117 ulpfec/90000\r\na=rtpmap:96 rtx/90000\r\na=fmtp:96 apt=100\r\na=ssrc-group:FID 187598656 415229902\r\na=ssrc:187598656 cname:Dl+cb/nGYCzEcTvH\r\na=ssrc:187598656 msid:OfkjcHABgxUkHlk8mfJ8ayYZdCHqdpQGFSTM 02ab4641-6cd5-43be-b0fe-9952585642bf\r\na=ssrc:187598656 mslabel:OfkjcHABgxUkHlk8mfJ8ayYZdCHqdpQGFSTM\r\na=ssrc:187598656 label:02ab4641-6cd5-43be-b0fe-9952585642bf\r\na=ssrc:415229902 cname:Dl+cb/nGYCzEcTvH\r\na=ssrc:415229902 msid:OfkjcHABgxUkHlk8mfJ8ayYZdCHqdpQGFSTM 02ab4641-6cd5-43be-b0fe-9952585642bf\r\na=ssrc:415229902 mslabel:OfkjcHABgxUkHlk8mfJ8ayYZdCHqdpQGFSTM\r\na=ssrc:415229902 label:02ab4641-6cd5-43be-b0fe-9952585642bf\r\n" }, "serverTime": 1431342100822 } 日志
libjingle: Ignored line: c=IN IP4 0.0.0.0 libjingle: Error(transport.cc:97): Answerer must use either active or passive value for setup attribute. libjingle:Error(webrtcsession.cc:272): Failed to set remote answer sdp: Failed to push down transport description: Answerer must use either active or passive value for setup attribute.
**首先我创建商品并添加localdescription然后使用emit将其发送到服务器，服务器返回回调包含远程sdp **
public void onCreateSuccess(SessionDescription arg0) { // TODO Auto-generated method stub try { if(arg0.type.canonicalForm().equalsIgnoreCase("answer")){ peer.setRemoteDescription(this, sdp); // mListener.onAddRemoteStream(localMS, 0); } else{ payload = new JSONObject(); payload.put("type", arg0.type.canonicalForm()); Log.d("offer", arg0.type.canonicalForm().toString()); payload.put("sdp", arg0.description); sendMessage("rtcsid", arg0.type.canonicalForm(), payload); peer.setLocalDescription(this, arg0); } } catch (JSONException e) { e.printStackTrace(); }
IceCandidate：
public void onIceCandidate(IceCandidate arg0) { // TODO Auto-generated method stub Log.d("IceCandidate", arg0.toString()); JSONObject payload = new JSONObject(); try { payload.put("type", arg0.sdpMLineIndex); Log.d("sdpMLineIndex", Integer.toString(arg0.sdpMLineIndex)); payload.put("id", arg0.sdpMid); Log.d("sdpMid", arg0.sdpMid.toString()); payload.put("type", arg0.sdp); Log.d("candidate", arg0.sdp.toString()); sendMessage("easyrtcsid", "candidate", payload); if(peer.getRemoteDescription()!=null){ IceCandidate candidate = new IceCandidate( arg0.sdpMid, arg0.sdpMLineIndex, arg0.sdp.toString() ); peer.addIceCandidate(candidate); } } catch (JSONException e) { e.printStackTrace(); } }
候选人的日志
{ 05-11 14:59:28.495: I/libjingle(14672): Local and Remote descriptions must be applied to get SSL Role of the session. 05-11 14:59:28.495: I/libjingle(14672): Transport: audio, allocating candidates 05-11 14:59:28.495: D/IceGatheringChange(14672): GATHERING 05-11 14:59:28.495: I/libjingle(14672): Transport: audio, allocating candidates 05-11 14:59:28.495: D/IceGatheringChange(14672): GATHERING 05-11 14:59:28.495: I/libjingle(14672): Transport: video, allocating candidates 05-11 14:59:28.495: D/IceGatheringChange(14672): GATHERING 05-11 14:59:28.495: I/libjingle(14672): Transport: video, allocating candidates 05-11 14:59:28.495: D/IceGatheringChange(14672): GATHERING 05-11 14:59:28.495: I/libjingle(14672): Jingle:Net[wlan0:10.0.0.0/8:Unknown]: Allocation Phase=Udp 05-11 14:59:28.505: I/libjingle(14672): Jingle:Port[:1:0::Net[wlan0:10.0.0.0/8:Unknown]]: Port created 05-11 14:59:28.505: I/libjingle(14672): AllocationSequence: UDPPort will be handling the STUN candidate generation. 05-11 14:59:28.505: I/libjingle(14672): Adding allocated port for audio 05-11 14:59:28.505: I/libjingle(14672): Jingle:Port[audio:1:0::Net[wlan0:10.0.0.0/8:Unknown]]: Added port to allocator 05-11 14:59:28.525: D/IceCandidate(14672): audio:0:candidate:1281544012 1 udp 2122260223 10.0.0.112 49865 typ host generation 0 05-11 14:59:28.525: D/sdpMLineIndex(14672): 0 05-11 14:59:28.525: D/sdpMid(14672): audio 05-11 14:59:28.525: D/candidate(14672): candidate:1281544012 1 udp 2122260223 10.0.0.112 49865 typ host generation 0 05-11 14:59:28.525: I/libjingle(14672): Jingle:Net[wlan0:10.0.0.0/8:Unknown]: Allocation Phase=Udp 05-11 14:59:28.525: I/libjingle(14672): Jingle:Port[:1:0::Net[wlan0:10.0.0.0/8:Unknown]]: Port created 05-11 14:59:28.525: I/libjingle(14672): AllocationSequence: UDPPort will be handling the STUN candidate generation. 05-11 14:59:28.525: I/libjingle(14672): Adding allocated port for audio 05-11 14:59:28.525: I/libjingle(14672): Jingle:Port[audio:2:0::Net[wlan0:10.0.0.0/8:Unknown]]: Added port to allocator 05-11 14:59:28.555: D/IceCandidate(14672): audio:0:candidate:1281544012 2 udp 2122260222 10.0.0.112 36221 typ host generation 0 05-11 14:59:28.555: D/sdpMLineIndex(14672): 0 05-11 14:59:28.555: D/sdpMid(14672): audio 05-11 14:59:28.555: D/candidate(14672): candidate:1281544012 2 udp 2122260222 10.0.0.112 36221 typ host generation 0 05-11 14:59:28.555: I/libjingle(14672): Jingle:Net[wlan0:10.0.0.0/8:Unknown]: Allocation Phase=Udp 05-11 14:59:28.555: I/libjingle(14672): Jingle:Port[:1:0::Net[wlan0:10.0.0.0/8:Unknown]]: Port created 05-11 14:59:28.555: I/libjingle(14672): AllocationSequence: UDPPort will be handling the STUN candidate generation. 05-11 14:59:28.555: I/libjingle(14672): Adding allocated port for video 05-11 14:59:28.555: I/libjingle(14672): Jingle:Port[video:1:0::Net[wlan0:10.0.0.0/8:Unknown]]: Added port to allocator 05-11 14:59:28.565: D/IceCandidate(14672): video:1:candidate:1281544012 1 udp 2122260223 10.0.0.112 57380 typ host generation 0 05-11 14:59:28.565: D/sdpMLineIndex(14672): 1 05-11 14:59:28.565: D/sdpMid(14672): video 05-11 14:59:28.565: D/candidate(14672): candidate:1281544012 1 udp 2122260223 10.0.0.112 57380 typ host generation 0 05-11 14:59:28.575: I/libjingle(14672): Jingle:Net[wlan0:10.0.0.0/8:Unknown]: Allocation Phase=Udp 05-11 14:59:28.575: I/libjingle(14672): Jingle:Port[:1:0::Net[wlan0:10.0.0.0/8:Unknown]]: Port created 05-11 14:59:28.575: I/libjingle(14672): AllocationSequence: UDPPort will be handling the STUN candidate generation. 05-11 14:59:28.575: I/libjingle(14672): Adding allocated port for video 05-11 14:59:28.575: I/libjingle(14672): Jingle:Port[video:2:0::Net[wlan0:10.0.0.0/8:Unknown]]: Added port to allocator 05-11 14:59:28.605: D/IceCandidate(14672): video:1:candidate:1281544012 2 udp 2122260222 10.0.0.112 48445 typ host generation 0 05-11 14:59:28.605: D/sdpMLineIndex(14672): 1 05-11 14:59:28.605: D/sdpMid(14672): video 05-11 14:59:28.605: D/candidate(14672): candidate:1281544012 2 udp 2122260222 10.0.0.112 48445 typ host generation 0 05-11 14:59:28.625: W/libjingle(14672): Warning(thread.cc:320): Waiting for the thread to join, but blocking calls have been disallowed 05-11 14:59:28.625: W/libjingle(14672): Warning(thread.cc:320): Waiting for the thread to join, but blocking calls have been disallowed 05-11 14:59:28.625: W/libjingle(14672): Warning(thread.cc:320): Waiting for the thread to join, but blocking calls have been disallowed 05-11 14:59:28.625: W/libjingle(14672): Warning(thread.cc:320): Waiting for the thread to join, but blocking calls have been disallowed 05-11 14:59:28.625: W/libjingle(14672): Warning(thread.cc:320): Waiting for the thread to join, but blocking calls have been disallowed 05-11 14:59:28.625: W/libjingle(14672): Warning(thread.cc:320): Waiting for the thread to join, but blocking calls have been disallowed 05-11 14:59:28.625: W/libjingle(14672): Warning(thread.cc:320): Waiting for the thread to join, but blocking calls have been disallowed 05-11 14:59:28.625: W/libjingle(14672): Warning(thread.cc:320): Waiting for the thread to join, but blocking calls have been disallowed 05-11 14:59:28.625: W/libjingle(14672): Warning(thread.cc:320): Waiting for the thread to join, but blocking calls have been disallowed 05-11 14:59:28.625: W/libjingle(14672): Warning(thread.cc:320): Waiting for the thread to join, but blocking calls have been disallowed 05-11 14:59:28.625: I/libjingle(14672): Jingle:Net[wlan0:10.0.0.0/8:Unknown]: Allocation Phase=Relay 05-11 14:59:28.625: I/libjingle(14672): Jingle:Net[wlan0:10.0.0.0/8:Unknown]: Allocation Phase=Relay 05-11 14:59:28.635: W/libjingle(14672): Warning(thread.cc:320): Waiting for the thread to join, but blocking calls have been disallowed 05-11 14:59:28.635: I/libjingle(14672): Jingle:Net[wlan0:10.0.0.0/8:Unknown]: Allocation Phase=Relay 05-11 14:59:28.635: W/libjingle(14672): Warning(thread.cc:320): Waiting for the thread to join, but blocking calls have been disallowed 05-11 14:59:28.635: D/IceCandidate(14672): audio:0:candidate:2940422560 1 udp 1686052607 197.44.239.36 49865 typ srflx raddr 10.0.0.112 rport 49865 generation 0 05-11 14:59:28.635: D/sdpMLineIndex(14672): 0 05-11 14:59:28.635: D/sdpMid(14672): audio 05-11 14:59:28.635: D/candidate(14672): candidate:2940422560 1 udp 1686052607 197.44.239.36 49865 typ srflx raddr 10.0.0.112 rport 49865 generation 0 05-11 14:59:28.645: D/IceCandidate(14672): audio:0:candidate:2940422560 2 udp 1686052606 197.44.239.36 36221 typ srflx raddr 10.0.0.112 rport 36221 generation 0 05-11 14:59:28.645: D/sdpMLineIndex(14672): 0 05-11 14:59:28.645: D/sdpMid(14672): audio 05-11 14:59:28.645: D/candidate(14672): candidate:2940422560 2 udp 1686052606 197.44.239.36 36221 typ srflx raddr 10.0.0.112 rport 36221 generation 0 05-11 14:59:28.665: I/libjingle(14672): Jingle:Net[wlan0:10.0.0.0/8:Unknown]: Allocation Phase=Relay 05-11 14:59:28.675: D/IceCandidate(14672): video:1:candidate:2940422560 1 udp 1686052607 197.44.239.36 57380 typ srflx raddr 10.0.0.112 rport 57380 generation 0 05-11 14:59:28.675: D/sdpMLineIndex(14672): 1 05-11 14:59:28.675: D/sdpMid(14672): video 05-11 14:59:28.675: D/candidate(14672): candidate:2940422560 1 udp 1686052607 197.44.239.36 57380 typ srflx raddr 10.0.0.112 rport 57380 generation 0 05-11 14:59:28.685: I/libjingle(14672): Jingle:Net[wlan0:10.0.0.0/8:Unknown]: Allocation Phase=Tcp 05-11 14:59:28.685: I/libjingle(14672): Jingle:Port[:1:0:local:Net[wlan0:10.0.0.0/8:Unknown]]: Port created 05-11 14:59:28.685: I/libjingle(14672): Adding allocated port for audio 05-11 14:59:28.685: I/libjingle(14672): Jingle:Port[audio:1:0:local:Net[wlan0:10.0.0.0/8:Unknown]]: Added port to allocator 05-11 14:59:28.685: I/libjingle(14672): Jingle:Net[wlan0:10.0.0.0/8:Unknown]: Allocation Phase=Tcp 05-11 14:59:28.685: D/IceCandidate(14672): audio:0:candidate:48313276 1 tcp 1518280447 10.0.0.112 40627 typ host tcptype passive generation 0 05-11 14:59:28.685: D/sdpMLineIndex(14672): 0 05-11 14:59:28.685: D/sdpMid(14672): audio 05-11 14:59:28.685: D/candidate(14672): candidate:48313276 1 tcp 1518280447 10.0.0.112 40627 typ host tcptype passive generation 0 05-11 14:59:28.685: I/libjingle(14672): Jingle:Port[:1:0:local:Net[wlan0:10.0.0.0/8:Unknown]]: Port created 05-11 14:59:28.685: I/libjingle(14672): Adding allocated port for audio 05-11 14:59:28.685: I/libjingle(14672): Jingle:Port[audio:2:0:local:Net[wlan0:10.0.0.0/8:Unknown]]: Added port to allocator 05-11 14:59:28.685: I/libjingle(14672): Jingle:Net[wlan0:10.0.0.0/8:Unknown]: Allocation Phase=Tcp 05-11 14:59:28.685: D/IceCandidate(14672): audio:0:candidate:48313276 2 tcp 1518280446 10.0.0.112 48390 typ host tcptype passive generation 0 05-11 14:59:28.685: D/sdpMLineIndex(14672): 0 05-11 14:59:28.685: D/sdpMid(14672): audio 05-11 14:59:28.685: D/candidate(14672): candidate:48313276 2 tcp 1518280446 10.0.0.112 48390 typ host tcptype passive generation 0 05-11 14:59:28.695: I/libjingle(14672): Jingle:Port[:1:0:local:Net[wlan0:10.0.0.0/8:Unknown]]: Port created 05-11 14:59:28.695: I/libjingle(14672): Adding allocated port for video 05-11 14:59:28.695: I/libjingle(14672): Jingle:Port[video:1:0:local:Net[wlan0:10.0.0.0/8:Unknown]]: Added port to allocator 05-11 14:59:28.695: D/IceCandidate(14672): video:1:candidate:48313276 1 tcp 1518280447 10.0.0.112 60960 typ host tcptype passive generation 0 05-11 14:59:28.695: D/sdpMLineIndex(14672): 1 05-11 14:59:28.695: D/sdpMid(14672): video 05-11 14:59:28.695: D/candidate(14672): candidate:48313276 1 tcp 1518280447 10.0.0.112 60960 typ host tcptype passive generation 0 05-11 14:59:28.705: D/IceCandidate(14672): video:1:candidate:2940422560 2 udp 1686052606 197.44.239.36 48445 typ srflx raddr 10.0.0.112 rport 48445 generation 0 05-11 14:59:28.705: D/sdpMLineIndex(14672): 1 05-11 14:59:28.715: D/sdpMid(14672): video 05-11 14:59:28.715: D/candidate(14672): candidate:2940422560 2 udp 1686052606 197.44.239.36 48445 typ srflx raddr 10.0.0.112 rport 48445 generation 0 05-11 14:59:28.725: I/libjingle(14672): Jingle:Net[wlan0:10.0.0.0/8:Unknown]: Allocation Phase=Tcp 05-11 14:59:28.725: I/libjingle(14672): Jingle:Port[:1:0:local:Net[wlan0:10.0.0.0/8:Unknown]]: Port created 05-11 14:59:28.725: I/libjingle(14672): Adding allocated port for video 05-11 14:59:28.725: I/libjingle(14672): Jingle:Port[video:2:0:local:Net[wlan0:10.0.0.0/8:Unknown]]: Added port to allocator 05-11 14:59:28.725: D/IceCandidate(14672): video:1:candidate:48313276 2 tcp 1518280446 10.0.0.112 59723 typ host tcptype passive generation 0 05-11 14:59:28.725: D/sdpMLineIndex(14672): 1 05-11 14:59:28.725: D/sdpMid(14672): video 05-11 14:59:28.725: D/candidate(14672): candidate:48313276 2 tcp 1518280446 10.0.0.112 59723 typ host tcptype passive generation 0 05-11 14:59:28.735: I/libjingle(14672): Jingle:Net[wlan0:10.0.0.0/8:Unknown]: Allocation Phase=SslTcp 05-11 14:59:28.735: I/libjingle(14672): Jingle:Net[wlan0:10.0.0.0/8:Unknown]: Allocation Phase=SslTcp 05-11 14:59:28.735: I/libjingle(14672): All candidates gathered for audio:2:0 05-11 14:59:28.735: I/libjingle(14672): Transport: audio, component 2 allocation complete 05-11 14:59:28.745: I/libjingle(14672): Jingle:Net[wlan0:10.0.0.0/8:Unknown]: Allocation Phase=SslTcp 05-11 14:59:28.745: I/libjingle(14672): All candidates gathered for video:1:0 05-11 14:59:28.745: I/libjingle(14672): Transport: video, component 1 allocation complete 05-11 14:59:28.775: I/libjingle(14672): Jingle:Net[wlan0:10.0.0.0/8:Unknown]: Allocation Phase=SslTcp 05-11 14:59:28.775: I/libjingle(14672): All candidates gathered for video:2:0 05-11 14:59:28.775: I/libjingle(14672): Transport: video, component 2 allocation complete 05-11 14:59:28.775: I/libjingle(14672): Transport: video allocation complete 05-11 14:59:28.775: I/libjingle(14672): Candidate allocation not done for audio 05-11 14:59:28.795: I/libjingle(14672): All candidates gathered for audio:1:0 05-11 14:59:28.795: I/libjingle(14672): Transport: audio, component 1 allocation complete 05-11 14:59:28.795: I/libjingle(14672): Transport: audio allocation complete 05-11 14:59:28.795: I/libjingle(14672): Candidate gathering is complete. 05-11 14:59:28.795: D/IceGatheringChange(14672): COMPLETE }
MediaConstraints
pcConstraints.mandatory.add(new MediaConstraints.KeyValuePair("OfferToReceiveAudio", "true")); pcConstraints.mandatory.add(new MediaConstraints.KeyValuePair("OfferToReceiveVideo", "true")); pcConstraints.optional.add(new MediaConstraints.KeyValuePair("DtlsSrtpKeyAgreement", "true"));
请记住，这是我自己的简陋代码，它可能并不完美，而且可能很难将所有内容复制到您自己的项目中。 它适用于我，但这并不意味着它将适用于其他所有人。
设置呼叫的过程如下（注意，这不是一成不变的）：
有两个设备，A和B，都连接到某种信令服务器，以允许它们交换SDP和ICE候选，以及互相邀请呼叫等…
A启动一个调用，第一步可能是向B发送一个邀请。我也想在此时使用以下代码初始化peerconnection对象：
//initialize the peerconnection factory PeerConnectionFactory.initializeAndroidGlobals(MainActivity.context, true, true, true, parent.tex_remote); factory = new PeerConnectionFactory(); //ice server initialization ArrayList iceServers = new ArrayList<>(); iceServers.add(new PeerConnection.IceServer("stun:stun.xxx.xxx:xxx")); iceServers.add(new PeerConnection.IceServer("turn:turn.xxx.xxx:xxx", "xxx", "xxx")); //create a new contraints object to configure the connection MediaConstraints connectionConstraints = new MediaConstraints(); connectionConstraints.mandatory.add(new MediaConstraints.KeyValuePair("offerToReceiveAudio", "true")); connectionConstraints.mandatory.add(new MediaConstraints.KeyValuePair("offerToReceiveVideo", "true")); connectionConstraints.optional.add(new MediaConstraints.KeyValuePair("DtlsSrtpKeyAgreement", "true")); //create a new peerconnection object peerConnection = factory.createPeerConnection(iceServers, connectionConstraints, observer);
完成此操作后，如果您有peerconnection对象，则可以使用以下代码初始化本地媒体流：
//create a new audio and video source, this is the stream that will be sent to the remote VideoSource videoSource = factory.createVideoSource(VideoCapturer.create("Camera 1, Facing front, Orientation 270"), new MediaConstraints()); AudioSource audioSource = factory.createAudioSource(new MediaConstraints()); //create a new audio and video track VideoTrack videoTrack = factory.createVideoTrack("ARDAMSv0", videoSource); AudioTrack audioTrack = factory.createAudioTrack("ARDAMSa0", audioSource); //create a new media stream, this holds all local streams and their tracks MediaStream lms = factory.createLocalMediaStream("ARDAMS"); //create a new video renderer and add it to the video track VideoRenderer renderer = new VideoRenderer(parent); videoTrack.addRenderer(renderer); //add the video track to the stream lms.addTrack(videoTrack); //add the audio track to the stream lms.addTrack(audioTrack); //add the stream to the connection peerConnection.addStream(lms);
同时，B将从信令服务器接收呼叫邀请，并且必须向用户呈现某种呼入呼叫视图。 当用户决定接听电话时，B将接受信号发送回A.
当A收到此接受信号时，是时候开始设置呼叫了。 在A上调用createOffer（），如果成功，库将调用onCreateSuccess（）：
peerConnection.createOffer(observer, new MediaConstraints());
在onCreateSuccess（）中，您可以使用新创建的SDP调用setLocalDescription（）。 您还必须将此SDP发送给B，因此您可以在此处执行此操作：
peerConnection.setLocalDescription(this, sessionDescription); //send this SDP to your remote peer
B现在将收到A的报价，您必须通过调用setRemoteDescription（）来设置：
peerConnection.setRemoteDescription(observer, sdp);
如果成功，库将调用onSetSuccess（）。 在onSetSuccess（）中，您可以调用createAnswer（）：
peerConnection.createAnswer(observer, constraints);
因为您现在确定您已初始提供SDP设置。 该库将再次为您调用onCreateSuccess（）。 B的回答现在与A的报价相同。 它将答案设置为本地SDP，并将其发送到A：
peerConnection.setLocalDescription(this, sessionDescription); //send this SDP to your remote peer
完成所有这些操作后，交换SDP即可完成。 该库还将多次调用onIceCandidate（）。 当您从另一个对等方收到ICE候选者时，您只需将此ICE候选者发送给另一个对等方并调用peerConnection.addIceCandidate（）。
pcConstraints.optional.add(new KeyValuePair("DtlsSrtpKeyAgreement", "true")); pcConstraints.optional.add(new KeyValuePair("RtpDataChannels", "true"));