1package eu.siacs.conversations.xmpp.jingle;
2
3import android.content.Context;
4import android.os.Build;
5import android.os.Handler;
6import android.os.Looper;
7import android.util.Log;
8
9import com.google.common.base.Optional;
10import com.google.common.base.Preconditions;
11import com.google.common.collect.ImmutableSet;
12import com.google.common.util.concurrent.Futures;
13import com.google.common.util.concurrent.ListenableFuture;
14import com.google.common.util.concurrent.MoreExecutors;
15import com.google.common.util.concurrent.SettableFuture;
16
17import org.webrtc.AudioSource;
18import org.webrtc.AudioTrack;
19import org.webrtc.CandidatePairChangeEvent;
20import org.webrtc.DataChannel;
21import org.webrtc.DefaultVideoDecoderFactory;
22import org.webrtc.DefaultVideoEncoderFactory;
23import org.webrtc.EglBase;
24import org.webrtc.IceCandidate;
25import org.webrtc.MediaConstraints;
26import org.webrtc.MediaStream;
27import org.webrtc.MediaStreamTrack;
28import org.webrtc.PeerConnection;
29import org.webrtc.PeerConnectionFactory;
30import org.webrtc.RtpReceiver;
31import org.webrtc.RtpTransceiver;
32import org.webrtc.SdpObserver;
33import org.webrtc.SessionDescription;
34import org.webrtc.VideoTrack;
35import org.webrtc.audio.JavaAudioDeviceModule;
36import org.webrtc.voiceengine.WebRtcAudioEffects;
37
38import java.util.LinkedList;
39import java.util.List;
40import java.util.Queue;
41import java.util.Set;
42import java.util.concurrent.ExecutorService;
43import java.util.concurrent.Executors;
44import java.util.concurrent.atomic.AtomicBoolean;
45
46import javax.annotation.Nonnull;
47import javax.annotation.Nullable;
48
49import eu.siacs.conversations.Config;
50import eu.siacs.conversations.services.AppRTCAudioManager;
51import eu.siacs.conversations.services.XmppConnectionService;
52
53@SuppressWarnings("UnstableApiUsage")
54public class WebRTCWrapper {
55
56 private static final String EXTENDED_LOGGING_TAG = WebRTCWrapper.class.getSimpleName();
57
58 private final ExecutorService executorService = Executors.newSingleThreadExecutor();
59
60 private static final Set<String> HARDWARE_AEC_BLACKLIST =
61 new ImmutableSet.Builder<String>()
62 .add("Pixel")
63 .add("Pixel XL")
64 .add("Moto G5")
65 .add("Moto G (5S) Plus")
66 .add("Moto G4")
67 .add("TA-1053")
68 .add("Mi A1")
69 .add("Mi A2")
70 .add("E5823") // Sony z5 compact
71 .add("Redmi Note 5")
72 .add("FP2") // Fairphone FP2
73 .add("MI 5")
74 .add("GT-I9515") // Samsung Galaxy S4 Value Edition (jfvelte)
75 .add("GT-I9515L") // Samsung Galaxy S4 Value Edition (jfvelte)
76 .add("GT-I9505") // Samsung Galaxy S4 (jfltexx)
77 .build();
78
79 private final EventCallback eventCallback;
80 private final AtomicBoolean readyToReceivedIceCandidates = new AtomicBoolean(false);
81 private final Queue<IceCandidate> iceCandidates = new LinkedList<>();
82 private final AppRTCAudioManager.AudioManagerEvents audioManagerEvents =
83 new AppRTCAudioManager.AudioManagerEvents() {
84 @Override
85 public void onAudioDeviceChanged(
86 AppRTCAudioManager.AudioDevice selectedAudioDevice,
87 Set<AppRTCAudioManager.AudioDevice> availableAudioDevices) {
88 eventCallback.onAudioDeviceChanged(selectedAudioDevice, availableAudioDevices);
89 }
90 };
91 private final Handler mainHandler = new Handler(Looper.getMainLooper());
92 private TrackWrapper<AudioTrack> localAudioTrack = null;
93 private TrackWrapper<VideoTrack> localVideoTrack = null;
94 private VideoTrack remoteVideoTrack = null;
95 private final PeerConnection.Observer peerConnectionObserver =
96 new PeerConnection.Observer() {
97 @Override
98 public void onSignalingChange(PeerConnection.SignalingState signalingState) {
99 Log.d(EXTENDED_LOGGING_TAG, "onSignalingChange(" + signalingState + ")");
100 // this is called after removeTrack or addTrack
101 // and should then trigger a content-add or content-remove or something
102 // https://developer.mozilla.org/en-US/docs/Web/API/RTCPeerConnection/removeTrack
103 }
104
105 @Override
106 public void onConnectionChange(final PeerConnection.PeerConnectionState newState) {
107 eventCallback.onConnectionChange(newState);
108 }
109
110 @Override
111 public void onIceConnectionChange(
112 PeerConnection.IceConnectionState iceConnectionState) {
113 Log.d(
114 EXTENDED_LOGGING_TAG,
115 "onIceConnectionChange(" + iceConnectionState + ")");
116 }
117
118 @Override
119 public void onSelectedCandidatePairChanged(CandidatePairChangeEvent event) {
120 Log.d(Config.LOGTAG, "remote candidate selected: " + event.remote);
121 Log.d(Config.LOGTAG, "local candidate selected: " + event.local);
122 }
123
124 @Override
125 public void onIceConnectionReceivingChange(boolean b) {}
126
127 @Override
128 public void onIceGatheringChange(
129 PeerConnection.IceGatheringState iceGatheringState) {
130 Log.d(EXTENDED_LOGGING_TAG, "onIceGatheringChange(" + iceGatheringState + ")");
131 }
132
133 @Override
134 public void onIceCandidate(IceCandidate iceCandidate) {
135 if (readyToReceivedIceCandidates.get()) {
136 eventCallback.onIceCandidate(iceCandidate);
137 } else {
138 iceCandidates.add(iceCandidate);
139 }
140 }
141
142 @Override
143 public void onIceCandidatesRemoved(IceCandidate[] iceCandidates) {}
144
145 @Override
146 public void onAddStream(MediaStream mediaStream) {
147 Log.d(
148 EXTENDED_LOGGING_TAG,
149 "onAddStream(numAudioTracks="
150 + mediaStream.audioTracks.size()
151 + ",numVideoTracks="
152 + mediaStream.videoTracks.size()
153 + ")");
154 }
155
156 @Override
157 public void onRemoveStream(MediaStream mediaStream) {}
158
159 @Override
160 public void onDataChannel(DataChannel dataChannel) {}
161
162 @Override
163 public void onRenegotiationNeeded() {
164 Log.d(EXTENDED_LOGGING_TAG, "onRenegotiationNeeded()");
165 final PeerConnection.PeerConnectionState currentState =
166 peerConnection == null ? null : peerConnection.connectionState();
167 if (currentState != null
168 && currentState != PeerConnection.PeerConnectionState.NEW) {
169 eventCallback.onRenegotiationNeeded();
170 }
171 }
172
173 @Override
174 public void onAddTrack(RtpReceiver rtpReceiver, MediaStream[] mediaStreams) {
175 final MediaStreamTrack track = rtpReceiver.track();
176 Log.d(
177 EXTENDED_LOGGING_TAG,
178 "onAddTrack(kind="
179 + (track == null ? "null" : track.kind())
180 + ",numMediaStreams="
181 + mediaStreams.length
182 + ")");
183 if (track instanceof VideoTrack) {
184 remoteVideoTrack = (VideoTrack) track;
185 }
186 }
187
188 @Override
189 public void onTrack(final RtpTransceiver transceiver) {
190 Log.d(
191 EXTENDED_LOGGING_TAG,
192 "onTrack(mid="
193 + transceiver.getMid()
194 + ",media="
195 + transceiver.getMediaType()
196 + ",direction="
197 + transceiver.getDirection()
198 + ")");
199 }
200
201 @Override
202 public void onRemoveTrack(final RtpReceiver receiver) {
203 Log.d(EXTENDED_LOGGING_TAG, "onRemoveTrack(" + receiver.id() + ")");
204 }
205 };
206 @Nullable private PeerConnectionFactory peerConnectionFactory = null;
207 @Nullable private PeerConnection peerConnection = null;
208 private AppRTCAudioManager appRTCAudioManager = null;
209 private ToneManager toneManager = null;
210 private Context context = null;
211 private EglBase eglBase = null;
212 private VideoSourceWrapper videoSourceWrapper;
213
214 WebRTCWrapper(final EventCallback eventCallback) {
215 this.eventCallback = eventCallback;
216 }
217
218 private static void dispose(final PeerConnection peerConnection) {
219 try {
220 peerConnection.dispose();
221 } catch (final IllegalStateException e) {
222 Log.e(Config.LOGTAG, "unable to dispose of peer connection", e);
223 }
224 }
225
226 public void setup(
227 final XmppConnectionService service,
228 final AppRTCAudioManager.SpeakerPhonePreference speakerPhonePreference)
229 throws InitializationException {
230 try {
231 PeerConnectionFactory.initialize(
232 PeerConnectionFactory.InitializationOptions.builder(service)
233 .setFieldTrials("WebRTC-BindUsingInterfaceName/Enabled/")
234 .createInitializationOptions());
235 } catch (final UnsatisfiedLinkError e) {
236 throw new InitializationException("Unable to initialize PeerConnectionFactory", e);
237 }
238 try {
239 this.eglBase = EglBase.create();
240 } catch (final RuntimeException e) {
241 throw new InitializationException("Unable to create EGL base", e);
242 }
243 this.context = service;
244 this.toneManager = service.getJingleConnectionManager().toneManager;
245 mainHandler.post(
246 () -> {
247 appRTCAudioManager = AppRTCAudioManager.create(service, speakerPhonePreference);
248 toneManager.setAppRtcAudioManagerHasControl(true);
249 appRTCAudioManager.start(audioManagerEvents);
250 eventCallback.onAudioDeviceChanged(
251 appRTCAudioManager.getSelectedAudioDevice(),
252 appRTCAudioManager.getAudioDevices());
253 });
254 }
255
256 synchronized void initializePeerConnection(
257 final Set<Media> media, final List<PeerConnection.IceServer> iceServers)
258 throws InitializationException {
259 Preconditions.checkState(this.eglBase != null);
260 Preconditions.checkNotNull(media);
261 Preconditions.checkArgument(
262 media.size() > 0, "media can not be empty when initializing peer connection");
263 final boolean setUseHardwareAcousticEchoCanceler =
264 WebRtcAudioEffects.canUseAcousticEchoCanceler()
265 && !HARDWARE_AEC_BLACKLIST.contains(Build.MODEL);
266 Log.d(
267 Config.LOGTAG,
268 String.format(
269 "setUseHardwareAcousticEchoCanceler(%s) model=%s",
270 setUseHardwareAcousticEchoCanceler, Build.MODEL));
271 this.peerConnectionFactory =
272 PeerConnectionFactory.builder()
273 .setVideoDecoderFactory(
274 new DefaultVideoDecoderFactory(eglBase.getEglBaseContext()))
275 .setVideoEncoderFactory(
276 new DefaultVideoEncoderFactory(
277 eglBase.getEglBaseContext(), true, true))
278 .setAudioDeviceModule(
279 JavaAudioDeviceModule.builder(requireContext())
280 .setUseHardwareAcousticEchoCanceler(
281 setUseHardwareAcousticEchoCanceler)
282 .createAudioDeviceModule())
283 .createPeerConnectionFactory();
284
285 final PeerConnection.RTCConfiguration rtcConfig = buildConfiguration(iceServers);
286 final PeerConnection peerConnection =
287 requirePeerConnectionFactory()
288 .createPeerConnection(rtcConfig, peerConnectionObserver);
289 if (peerConnection == null) {
290 throw new InitializationException("Unable to create PeerConnection");
291 }
292
293 if (media.contains(Media.VIDEO)) {
294 addVideoTrack(peerConnection);
295 }
296
297 if (media.contains(Media.AUDIO)) {
298 addAudioTrack(peerConnection);
299 }
300 peerConnection.setAudioPlayout(true);
301 peerConnection.setAudioRecording(true);
302
303 this.peerConnection = peerConnection;
304 }
305
306 private VideoSourceWrapper initializeVideoSourceWrapper() {
307 final VideoSourceWrapper existingVideoSourceWrapper = this.videoSourceWrapper;
308 if (existingVideoSourceWrapper != null) {
309 existingVideoSourceWrapper.startCapture();
310 return existingVideoSourceWrapper;
311 }
312 final VideoSourceWrapper videoSourceWrapper =
313 new VideoSourceWrapper.Factory(requireContext()).create();
314 if (videoSourceWrapper == null) {
315 throw new IllegalStateException("Could not instantiate VideoSourceWrapper");
316 }
317 videoSourceWrapper.initialize(
318 requirePeerConnectionFactory(), requireContext(), eglBase.getEglBaseContext());
319 videoSourceWrapper.startCapture();
320 this.videoSourceWrapper = videoSourceWrapper;
321 return videoSourceWrapper;
322 }
323
324 public synchronized boolean addTrack(final Media media) {
325 if (media == Media.VIDEO) {
326 return addVideoTrack(requirePeerConnection());
327 } else if (media == Media.AUDIO) {
328 return addAudioTrack(requirePeerConnection());
329 }
330 throw new IllegalStateException(String.format("Could not add track for %s", media));
331 }
332
333 private boolean addAudioTrack(final PeerConnection peerConnection) {
334 final AudioSource audioSource =
335 requirePeerConnectionFactory().createAudioSource(new MediaConstraints());
336 final AudioTrack audioTrack =
337 requirePeerConnectionFactory().createAudioTrack("my-audio-track", audioSource);
338 this.localAudioTrack = TrackWrapper.addTrack(peerConnection, audioTrack);
339 return true;
340 }
341
342 private boolean addVideoTrack(final PeerConnection peerConnection) {
343 Preconditions.checkState(
344 this.localVideoTrack == null, "A local video track already exists");
345 final VideoSourceWrapper videoSourceWrapper;
346 try {
347 videoSourceWrapper = initializeVideoSourceWrapper();
348 } catch (final IllegalStateException e) {
349 Log.d(Config.LOGTAG, "could not add video track", e);
350 return false;
351 }
352 final VideoTrack videoTrack =
353 requirePeerConnectionFactory()
354 .createVideoTrack("my-video-track", videoSourceWrapper.getVideoSource());
355 this.localVideoTrack = TrackWrapper.addTrack(peerConnection, videoTrack);
356 return true;
357 }
358
359 private static PeerConnection.RTCConfiguration buildConfiguration(
360 final List<PeerConnection.IceServer> iceServers) {
361 final PeerConnection.RTCConfiguration rtcConfig =
362 new PeerConnection.RTCConfiguration(iceServers);
363 rtcConfig.tcpCandidatePolicy =
364 PeerConnection.TcpCandidatePolicy.DISABLED; // XEP-0176 doesn't support tcp
365 rtcConfig.continualGatheringPolicy =
366 PeerConnection.ContinualGatheringPolicy.GATHER_CONTINUALLY;
367 rtcConfig.sdpSemantics = PeerConnection.SdpSemantics.UNIFIED_PLAN;
368 rtcConfig.rtcpMuxPolicy = PeerConnection.RtcpMuxPolicy.NEGOTIATE;
369 rtcConfig.enableImplicitRollback = true;
370 return rtcConfig;
371 }
372
373 void reconfigurePeerConnection(final List<PeerConnection.IceServer> iceServers) {
374 requirePeerConnection().setConfiguration(buildConfiguration(iceServers));
375 }
376
377 void restartIce() {
378 executorService.execute(() -> requirePeerConnection().restartIce());
379 }
380
381 public void setIsReadyToReceiveIceCandidates(final boolean ready) {
382 readyToReceivedIceCandidates.set(ready);
383 while (ready && iceCandidates.peek() != null) {
384 eventCallback.onIceCandidate(iceCandidates.poll());
385 }
386 }
387
388 synchronized void close() {
389 final PeerConnection peerConnection = this.peerConnection;
390 final PeerConnectionFactory peerConnectionFactory = this.peerConnectionFactory;
391 final VideoSourceWrapper videoSourceWrapper = this.videoSourceWrapper;
392 final AppRTCAudioManager audioManager = this.appRTCAudioManager;
393 final EglBase eglBase = this.eglBase;
394 if (peerConnection != null) {
395 dispose(peerConnection);
396 this.peerConnection = null;
397 }
398 if (audioManager != null) {
399 toneManager.setAppRtcAudioManagerHasControl(false);
400 mainHandler.post(audioManager::stop);
401 }
402 this.localVideoTrack = null;
403 this.remoteVideoTrack = null;
404 if (videoSourceWrapper != null) {
405 try {
406 videoSourceWrapper.stopCapture();
407 } catch (final InterruptedException e) {
408 Log.e(Config.LOGTAG, "unable to stop capturing");
409 }
410 videoSourceWrapper.dispose();
411 }
412 if (eglBase != null) {
413 eglBase.release();
414 this.eglBase = null;
415 }
416 if (peerConnectionFactory != null) {
417 peerConnectionFactory.dispose();
418 }
419 }
420
421 synchronized void verifyClosed() {
422 if (this.peerConnection != null
423 || this.eglBase != null
424 || this.localVideoTrack != null
425 || this.remoteVideoTrack != null) {
426 final IllegalStateException e =
427 new IllegalStateException("WebRTCWrapper hasn't been closed properly");
428 Log.e(Config.LOGTAG, "verifyClosed() failed. Going to throw", e);
429 throw e;
430 }
431 }
432
433 boolean isCameraSwitchable() {
434 final VideoSourceWrapper videoSourceWrapper = this.videoSourceWrapper;
435 return videoSourceWrapper != null && videoSourceWrapper.isCameraSwitchable();
436 }
437
438 boolean isFrontCamera() {
439 final VideoSourceWrapper videoSourceWrapper = this.videoSourceWrapper;
440 return videoSourceWrapper == null || videoSourceWrapper.isFrontCamera();
441 }
442
443 ListenableFuture<Boolean> switchCamera() {
444 final VideoSourceWrapper videoSourceWrapper = this.videoSourceWrapper;
445 if (videoSourceWrapper == null) {
446 return Futures.immediateFailedFuture(
447 new IllegalStateException("VideoSourceWrapper has not been initialized"));
448 }
449 return videoSourceWrapper.switchCamera();
450 }
451
452 boolean isMicrophoneEnabled() {
453 final Optional<AudioTrack> audioTrack = TrackWrapper.get(this.localAudioTrack);
454 if (audioTrack.isPresent()) {
455 try {
456 return audioTrack.get().enabled();
457 } catch (final IllegalStateException e) {
458 // sometimes UI might still be rendering the buttons when a background thread has
459 // already ended the call
460 return false;
461 }
462 } else {
463 throw new IllegalStateException("Local audio track does not exist (yet)");
464 }
465 }
466
467 boolean setMicrophoneEnabled(final boolean enabled) {
468 final Optional<AudioTrack> audioTrack = TrackWrapper.get(this.localAudioTrack);
469 if (audioTrack.isPresent()) {
470 try {
471 audioTrack.get().setEnabled(enabled);
472 return true;
473 } catch (final IllegalStateException e) {
474 Log.d(Config.LOGTAG, "unable to toggle microphone", e);
475 // ignoring race condition in case MediaStreamTrack has been disposed
476 return false;
477 }
478 } else {
479 throw new IllegalStateException("Local audio track does not exist (yet)");
480 }
481 }
482
483 boolean isVideoEnabled() {
484 final Optional<VideoTrack> videoTrack = TrackWrapper.get(this.localVideoTrack);
485 if (videoTrack.isPresent()) {
486 return videoTrack.get().enabled();
487 }
488 return false;
489 }
490
491 void setVideoEnabled(final boolean enabled) {
492 final Optional<VideoTrack> videoTrack = TrackWrapper.get(this.localVideoTrack);
493 if (videoTrack.isPresent()) {
494 videoTrack.get().setEnabled(enabled);
495 return;
496 }
497 throw new IllegalStateException("Local video track does not exist");
498 }
499
500 synchronized ListenableFuture<SessionDescription> setLocalDescription() {
501 return Futures.transformAsync(
502 getPeerConnectionFuture(),
503 peerConnection -> {
504 if (peerConnection == null) {
505 return Futures.immediateFailedFuture(
506 new IllegalStateException("PeerConnection was null"));
507 }
508 final SettableFuture<SessionDescription> future = SettableFuture.create();
509 peerConnection.setLocalDescription(
510 new SetSdpObserver() {
511 @Override
512 public void onSetSuccess() {
513 final SessionDescription description =
514 peerConnection.getLocalDescription();
515 Log.d(EXTENDED_LOGGING_TAG, "set local description:");
516 logDescription(description);
517 future.set(description);
518 }
519
520 @Override
521 public void onSetFailure(final String message) {
522 future.setException(
523 new FailureToSetDescriptionException(message));
524 }
525 });
526 return future;
527 },
528 MoreExecutors.directExecutor());
529 }
530
531 private static void logDescription(final SessionDescription sessionDescription) {
532 for (final String line :
533 sessionDescription.description.split(
534 eu.siacs.conversations.xmpp.jingle.SessionDescription.LINE_DIVIDER)) {
535 Log.d(EXTENDED_LOGGING_TAG, line);
536 }
537 }
538
539 synchronized ListenableFuture<Void> setRemoteDescription(
540 final SessionDescription sessionDescription) {
541 Log.d(EXTENDED_LOGGING_TAG, "setting remote description:");
542 logDescription(sessionDescription);
543 return Futures.transformAsync(
544 getPeerConnectionFuture(),
545 peerConnection -> {
546 if (peerConnection == null) {
547 return Futures.immediateFailedFuture(
548 new IllegalStateException("PeerConnection was null"));
549 }
550 final SettableFuture<Void> future = SettableFuture.create();
551 peerConnection.setRemoteDescription(
552 new SetSdpObserver() {
553 @Override
554 public void onSetSuccess() {
555 future.set(null);
556 }
557
558 @Override
559 public void onSetFailure(final String message) {
560 future.setException(
561 new FailureToSetDescriptionException(message));
562 }
563 },
564 sessionDescription);
565 return future;
566 },
567 MoreExecutors.directExecutor());
568 }
569
570 @Nonnull
571 private ListenableFuture<PeerConnection> getPeerConnectionFuture() {
572 final PeerConnection peerConnection = this.peerConnection;
573 if (peerConnection == null) {
574 return Futures.immediateFailedFuture(new PeerConnectionNotInitialized());
575 } else {
576 return Futures.immediateFuture(peerConnection);
577 }
578 }
579
580 @Nonnull
581 private PeerConnection requirePeerConnection() {
582 final PeerConnection peerConnection = this.peerConnection;
583 if (peerConnection == null) {
584 throw new PeerConnectionNotInitialized();
585 }
586 return peerConnection;
587 }
588
589 @Nonnull
590 private PeerConnectionFactory requirePeerConnectionFactory() {
591 final PeerConnectionFactory peerConnectionFactory = this.peerConnectionFactory;
592 if (peerConnectionFactory == null) {
593 throw new IllegalStateException("Make sure PeerConnectionFactory is initialized");
594 }
595 return peerConnectionFactory;
596 }
597
598 void addIceCandidate(IceCandidate iceCandidate) {
599 requirePeerConnection().addIceCandidate(iceCandidate);
600 }
601
602 PeerConnection.PeerConnectionState getState() {
603 return requirePeerConnection().connectionState();
604 }
605
606 public PeerConnection.SignalingState getSignalingState() {
607 return requirePeerConnection().signalingState();
608 }
609
610 EglBase.Context getEglBaseContext() {
611 return this.eglBase.getEglBaseContext();
612 }
613
614 Optional<VideoTrack> getLocalVideoTrack() {
615 return TrackWrapper.get(this.localVideoTrack);
616 }
617
618 Optional<VideoTrack> getRemoteVideoTrack() {
619 return Optional.fromNullable(this.remoteVideoTrack);
620 }
621
622 private Context requireContext() {
623 final Context context = this.context;
624 if (context == null) {
625 throw new IllegalStateException("call setup first");
626 }
627 return context;
628 }
629
630 AppRTCAudioManager getAudioManager() {
631 return appRTCAudioManager;
632 }
633
634 void execute(final Runnable command) {
635 executorService.execute(command);
636 }
637
638 public interface EventCallback {
639 void onIceCandidate(IceCandidate iceCandidate);
640
641 void onConnectionChange(PeerConnection.PeerConnectionState newState);
642
643 void onAudioDeviceChanged(
644 AppRTCAudioManager.AudioDevice selectedAudioDevice,
645 Set<AppRTCAudioManager.AudioDevice> availableAudioDevices);
646
647 void onRenegotiationNeeded();
648 }
649
650 private abstract static class SetSdpObserver implements SdpObserver {
651
652 @Override
653 public void onCreateSuccess(org.webrtc.SessionDescription sessionDescription) {
654 throw new IllegalStateException("Not able to use SetSdpObserver");
655 }
656
657 @Override
658 public void onCreateFailure(String s) {
659 throw new IllegalStateException("Not able to use SetSdpObserver");
660 }
661 }
662
663 static class InitializationException extends Exception {
664
665 private InitializationException(final String message, final Throwable throwable) {
666 super(message, throwable);
667 }
668
669 private InitializationException(final String message) {
670 super(message);
671 }
672 }
673
674 public static class PeerConnectionNotInitialized extends IllegalStateException {
675
676 private PeerConnectionNotInitialized() {
677 super("initialize PeerConnection first");
678 }
679 }
680
681 private static class FailureToSetDescriptionException extends IllegalArgumentException {
682 public FailureToSetDescriptionException(String message) {
683 super(message);
684 }
685 }
686}