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.collect.Iterables;
13import com.google.common.util.concurrent.Futures;
14import com.google.common.util.concurrent.ListenableFuture;
15import com.google.common.util.concurrent.MoreExecutors;
16import com.google.common.util.concurrent.SettableFuture;
17
18import org.webrtc.AudioSource;
19import org.webrtc.AudioTrack;
20import org.webrtc.Camera2Enumerator;
21import org.webrtc.CameraEnumerationAndroid;
22import org.webrtc.CameraEnumerator;
23import org.webrtc.CameraVideoCapturer;
24import org.webrtc.CandidatePairChangeEvent;
25import org.webrtc.DataChannel;
26import org.webrtc.DefaultVideoDecoderFactory;
27import org.webrtc.DefaultVideoEncoderFactory;
28import org.webrtc.EglBase;
29import org.webrtc.IceCandidate;
30import org.webrtc.MediaConstraints;
31import org.webrtc.MediaStream;
32import org.webrtc.MediaStreamTrack;
33import org.webrtc.PeerConnection;
34import org.webrtc.PeerConnectionFactory;
35import org.webrtc.RtpReceiver;
36import org.webrtc.RtpTransceiver;
37import org.webrtc.SdpObserver;
38import org.webrtc.SessionDescription;
39import org.webrtc.SurfaceTextureHelper;
40import org.webrtc.VideoSource;
41import org.webrtc.VideoTrack;
42import org.webrtc.audio.JavaAudioDeviceModule;
43import org.webrtc.voiceengine.WebRtcAudioEffects;
44
45import java.util.ArrayList;
46import java.util.Collections;
47import java.util.LinkedList;
48import java.util.List;
49import java.util.Queue;
50import java.util.Set;
51import java.util.concurrent.ExecutorService;
52import java.util.concurrent.Executors;
53import java.util.concurrent.atomic.AtomicBoolean;
54
55import javax.annotation.Nonnull;
56import javax.annotation.Nullable;
57
58import eu.siacs.conversations.Config;
59import eu.siacs.conversations.services.AppRTCAudioManager;
60import eu.siacs.conversations.services.XmppConnectionService;
61
62public class WebRTCWrapper {
63
64 private static final String EXTENDED_LOGGING_TAG = WebRTCWrapper.class.getSimpleName();
65
66 private final ExecutorService executorService = Executors.newSingleThreadExecutor();
67
68 //we should probably keep this in sync with: https://github.com/signalapp/Signal-Android/blob/master/app/src/main/java/org/thoughtcrime/securesms/ApplicationContext.java#L296
69 private static final Set<String> HARDWARE_AEC_BLACKLIST = new ImmutableSet.Builder<String>()
70 .add("Pixel")
71 .add("Pixel XL")
72 .add("Moto G5")
73 .add("Moto G (5S) Plus")
74 .add("Moto G4")
75 .add("TA-1053")
76 .add("Mi A1")
77 .add("Mi A2")
78 .add("E5823") // Sony z5 compact
79 .add("Redmi Note 5")
80 .add("FP2") // Fairphone FP2
81 .add("MI 5")
82 .build();
83
84 private static final int CAPTURING_RESOLUTION = 1920;
85 private static final int CAPTURING_MAX_FRAME_RATE = 30;
86
87 private final EventCallback eventCallback;
88 private final AtomicBoolean readyToReceivedIceCandidates = new AtomicBoolean(false);
89 private final Queue<IceCandidate> iceCandidates = new LinkedList<>();
90 private final AppRTCAudioManager.AudioManagerEvents audioManagerEvents = new AppRTCAudioManager.AudioManagerEvents() {
91 @Override
92 public void onAudioDeviceChanged(AppRTCAudioManager.AudioDevice selectedAudioDevice, Set<AppRTCAudioManager.AudioDevice> availableAudioDevices) {
93 eventCallback.onAudioDeviceChanged(selectedAudioDevice, availableAudioDevices);
94 }
95 };
96 private final Handler mainHandler = new Handler(Looper.getMainLooper());
97 private VideoTrack localVideoTrack = null;
98 private VideoTrack remoteVideoTrack = null;
99 private final PeerConnection.Observer peerConnectionObserver = new PeerConnection.Observer() {
100 @Override
101 public void onSignalingChange(PeerConnection.SignalingState signalingState) {
102 Log.d(EXTENDED_LOGGING_TAG, "onSignalingChange(" + signalingState + ")");
103 //this is called after removeTrack or addTrack
104 //and should then trigger a content-add or content-remove or something
105 //https://developer.mozilla.org/en-US/docs/Web/API/RTCPeerConnection/removeTrack
106 }
107
108 @Override
109 public void onConnectionChange(final PeerConnection.PeerConnectionState newState) {
110 eventCallback.onConnectionChange(newState);
111 }
112
113 @Override
114 public void onIceConnectionChange(PeerConnection.IceConnectionState iceConnectionState) {
115 Log.d(EXTENDED_LOGGING_TAG, "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 }
128
129 @Override
130 public void onIceGatheringChange(PeerConnection.IceGatheringState iceGatheringState) {
131 Log.d(EXTENDED_LOGGING_TAG, "onIceGatheringChange(" + iceGatheringState + ")");
132 }
133
134 @Override
135 public void onIceCandidate(IceCandidate iceCandidate) {
136 if (readyToReceivedIceCandidates.get()) {
137 eventCallback.onIceCandidate(iceCandidate);
138 } else {
139 iceCandidates.add(iceCandidate);
140 }
141 }
142
143 @Override
144 public void onIceCandidatesRemoved(IceCandidate[] iceCandidates) {
145
146 }
147
148 @Override
149 public void onAddStream(MediaStream mediaStream) {
150 Log.d(EXTENDED_LOGGING_TAG, "onAddStream(numAudioTracks=" + mediaStream.audioTracks.size() + ",numVideoTracks=" + mediaStream.videoTracks.size() + ")");
151 }
152
153 @Override
154 public void onRemoveStream(MediaStream mediaStream) {
155
156 }
157
158 @Override
159 public void onDataChannel(DataChannel dataChannel) {
160
161 }
162
163 @Override
164 public void onRenegotiationNeeded() {
165 Log.d(EXTENDED_LOGGING_TAG, "onRenegotiationNeeded()");
166 final PeerConnection.PeerConnectionState currentState = peerConnection == null ? null : peerConnection.connectionState();
167 if (currentState != null && currentState != PeerConnection.PeerConnectionState.NEW) {
168 eventCallback.onRenegotiationNeeded();
169 }
170 }
171
172 @Override
173 public void onAddTrack(RtpReceiver rtpReceiver, MediaStream[] mediaStreams) {
174 final MediaStreamTrack track = rtpReceiver.track();
175 Log.d(EXTENDED_LOGGING_TAG, "onAddTrack(kind=" + (track == null ? "null" : track.kind()) + ",numMediaStreams=" + mediaStreams.length + ")");
176 if (track instanceof VideoTrack) {
177 remoteVideoTrack = (VideoTrack) track;
178 }
179 }
180
181 @Override
182 public void onTrack(RtpTransceiver transceiver) {
183 Log.d(EXTENDED_LOGGING_TAG, "onTrack(mid=" + transceiver.getMid() + ",media=" + transceiver.getMediaType() + ")");
184 }
185 };
186 @Nullable
187 private PeerConnection peerConnection = null;
188 private AudioTrack localAudioTrack = null;
189 private AppRTCAudioManager appRTCAudioManager = null;
190 private ToneManager toneManager = null;
191 private Context context = null;
192 private EglBase eglBase = null;
193 private CapturerChoice capturerChoice;
194
195 WebRTCWrapper(final EventCallback eventCallback) {
196 this.eventCallback = eventCallback;
197 }
198
199 private static void dispose(final PeerConnection peerConnection) {
200 try {
201 peerConnection.dispose();
202 } catch (final IllegalStateException e) {
203 Log.e(Config.LOGTAG, "unable to dispose of peer connection", e);
204 }
205 }
206
207 @Nullable
208 private static CapturerChoice of(CameraEnumerator enumerator, final String deviceName, Set<String> availableCameras) {
209 final CameraVideoCapturer capturer = enumerator.createCapturer(deviceName, null);
210 if (capturer == null) {
211 return null;
212 }
213 final ArrayList<CameraEnumerationAndroid.CaptureFormat> choices = new ArrayList<>(enumerator.getSupportedFormats(deviceName));
214 Collections.sort(choices, (a, b) -> b.width - a.width);
215 for (final CameraEnumerationAndroid.CaptureFormat captureFormat : choices) {
216 if (captureFormat.width <= CAPTURING_RESOLUTION) {
217 return new CapturerChoice(capturer, captureFormat, availableCameras);
218 }
219 }
220 return null;
221 }
222
223 private static boolean isFrontFacing(final CameraEnumerator cameraEnumerator, final String deviceName) {
224 try {
225 return cameraEnumerator.isFrontFacing(deviceName);
226 } catch (final NullPointerException e) {
227 return false;
228 }
229 }
230
231 public void setup(final XmppConnectionService service, final AppRTCAudioManager.SpeakerPhonePreference speakerPhonePreference) throws InitializationException {
232 try {
233 PeerConnectionFactory.initialize(
234 PeerConnectionFactory.InitializationOptions.builder(service).createInitializationOptions()
235 );
236 } catch (final UnsatisfiedLinkError e) {
237 throw new InitializationException("Unable to initialize PeerConnectionFactory", e);
238 }
239 try {
240 this.eglBase = EglBase.create();
241 } catch (final RuntimeException e) {
242 throw new InitializationException("Unable to create EGL base", e);
243 }
244 this.context = service;
245 this.toneManager = service.getJingleConnectionManager().toneManager;
246 mainHandler.post(() -> {
247 appRTCAudioManager = AppRTCAudioManager.create(service, speakerPhonePreference);
248 toneManager.setAppRtcAudioManagerHasControl(true);
249 appRTCAudioManager.start(audioManagerEvents);
250 eventCallback.onAudioDeviceChanged(appRTCAudioManager.getSelectedAudioDevice(), appRTCAudioManager.getAudioDevices());
251 });
252 }
253
254 synchronized void initializePeerConnection(final Set<Media> media, final List<PeerConnection.IceServer> iceServers) throws InitializationException {
255 Preconditions.checkState(this.eglBase != null);
256 Preconditions.checkNotNull(media);
257 Preconditions.checkArgument(media.size() > 0, "media can not be empty when initializing peer connection");
258 final boolean setUseHardwareAcousticEchoCanceler = WebRtcAudioEffects.canUseAcousticEchoCanceler() && !HARDWARE_AEC_BLACKLIST.contains(Build.MODEL);
259 Log.d(Config.LOGTAG, String.format("setUseHardwareAcousticEchoCanceler(%s) model=%s", setUseHardwareAcousticEchoCanceler, Build.MODEL));
260 PeerConnectionFactory peerConnectionFactory = PeerConnectionFactory.builder()
261 .setVideoDecoderFactory(new DefaultVideoDecoderFactory(eglBase.getEglBaseContext()))
262 .setVideoEncoderFactory(new DefaultVideoEncoderFactory(eglBase.getEglBaseContext(), true, true))
263 .setAudioDeviceModule(JavaAudioDeviceModule.builder(context)
264 .setUseHardwareAcousticEchoCanceler(setUseHardwareAcousticEchoCanceler)
265 .createAudioDeviceModule()
266 )
267 .createPeerConnectionFactory();
268
269
270 final PeerConnection.RTCConfiguration rtcConfig = new PeerConnection.RTCConfiguration(iceServers);
271 rtcConfig.tcpCandidatePolicy = PeerConnection.TcpCandidatePolicy.DISABLED; //XEP-0176 doesn't support tcp
272 rtcConfig.continualGatheringPolicy = PeerConnection.ContinualGatheringPolicy.GATHER_CONTINUALLY;
273 rtcConfig.sdpSemantics = PeerConnection.SdpSemantics.UNIFIED_PLAN;
274 rtcConfig.rtcpMuxPolicy = PeerConnection.RtcpMuxPolicy.NEGOTIATE;
275 rtcConfig.enableImplicitRollback = true;
276 final PeerConnection peerConnection = peerConnectionFactory.createPeerConnection(rtcConfig, peerConnectionObserver);
277 if (peerConnection == null) {
278 throw new InitializationException("Unable to create PeerConnection");
279 }
280
281 final Optional<CapturerChoice> optionalCapturerChoice = media.contains(Media.VIDEO) ? getVideoCapturer() : Optional.absent();
282
283 if (optionalCapturerChoice.isPresent()) {
284 this.capturerChoice = optionalCapturerChoice.get();
285 final CameraVideoCapturer capturer = this.capturerChoice.cameraVideoCapturer;
286 final VideoSource videoSource = peerConnectionFactory.createVideoSource(false);
287 SurfaceTextureHelper surfaceTextureHelper = SurfaceTextureHelper.create("webrtc", eglBase.getEglBaseContext());
288 capturer.initialize(surfaceTextureHelper, requireContext(), videoSource.getCapturerObserver());
289 Log.d(Config.LOGTAG, String.format("start capturing at %dx%d@%d", capturerChoice.captureFormat.width, capturerChoice.captureFormat.height, capturerChoice.getFrameRate()));
290 capturer.startCapture(capturerChoice.captureFormat.width, capturerChoice.captureFormat.height, capturerChoice.getFrameRate());
291
292 this.localVideoTrack = peerConnectionFactory.createVideoTrack("my-video-track", videoSource);
293
294 peerConnection.addTrack(this.localVideoTrack);
295 }
296
297
298 if (media.contains(Media.AUDIO)) {
299 //set up audio track
300 final AudioSource audioSource = peerConnectionFactory.createAudioSource(new MediaConstraints());
301 this.localAudioTrack = peerConnectionFactory.createAudioTrack("my-audio-track", audioSource);
302 peerConnection.addTrack(this.localAudioTrack);
303 }
304 peerConnection.setAudioPlayout(true);
305 peerConnection.setAudioRecording(true);
306 this.peerConnection = peerConnection;
307 }
308
309 void restartIce() {
310 executorService.execute(() -> requirePeerConnection().restartIce());
311 }
312
313 public void setIsReadyToReceiveIceCandidates(final boolean ready) {
314 readyToReceivedIceCandidates.set(ready);
315 while (ready && iceCandidates.peek() != null) {
316 eventCallback.onIceCandidate(iceCandidates.poll());
317 }
318 }
319
320 synchronized void close() {
321 final PeerConnection peerConnection = this.peerConnection;
322 final CapturerChoice capturerChoice = this.capturerChoice;
323 final AppRTCAudioManager audioManager = this.appRTCAudioManager;
324 final EglBase eglBase = this.eglBase;
325 if (peerConnection != null) {
326 dispose(peerConnection);
327 this.peerConnection = null;
328 }
329 if (audioManager != null) {
330 toneManager.setAppRtcAudioManagerHasControl(false);
331 mainHandler.post(audioManager::stop);
332 }
333 this.localVideoTrack = null;
334 this.remoteVideoTrack = null;
335 if (capturerChoice != null) {
336 try {
337 capturerChoice.cameraVideoCapturer.stopCapture();
338 } catch (InterruptedException e) {
339 Log.e(Config.LOGTAG, "unable to stop capturing");
340 }
341 }
342 if (eglBase != null) {
343 eglBase.release();
344 this.eglBase = null;
345 }
346 }
347
348 synchronized void verifyClosed() {
349 if (this.peerConnection != null
350 || this.eglBase != null
351 || this.localVideoTrack != null
352 || this.remoteVideoTrack != null) {
353 final IllegalStateException e = new IllegalStateException("WebRTCWrapper hasn't been closed properly");
354 Log.e(Config.LOGTAG, "verifyClosed() failed. Going to throw", e);
355 throw e;
356 }
357 }
358
359 boolean isCameraSwitchable() {
360 final CapturerChoice capturerChoice = this.capturerChoice;
361 return capturerChoice != null && capturerChoice.availableCameras.size() > 1;
362 }
363
364 boolean isFrontCamera() {
365 final CapturerChoice capturerChoice = this.capturerChoice;
366 return capturerChoice == null || capturerChoice.isFrontCamera;
367 }
368
369 ListenableFuture<Boolean> switchCamera() {
370 final CapturerChoice capturerChoice = this.capturerChoice;
371 if (capturerChoice == null) {
372 return Futures.immediateFailedFuture(new IllegalStateException("CameraCapturer has not been initialized"));
373 }
374 final SettableFuture<Boolean> future = SettableFuture.create();
375 capturerChoice.cameraVideoCapturer.switchCamera(new CameraVideoCapturer.CameraSwitchHandler() {
376 @Override
377 public void onCameraSwitchDone(boolean isFrontCamera) {
378 capturerChoice.isFrontCamera = isFrontCamera;
379 future.set(isFrontCamera);
380 }
381
382 @Override
383 public void onCameraSwitchError(final String message) {
384 future.setException(new IllegalStateException(String.format("Unable to switch camera %s", message)));
385 }
386 });
387 return future;
388 }
389
390 boolean isMicrophoneEnabled() {
391 final AudioTrack audioTrack = this.localAudioTrack;
392 if (audioTrack == null) {
393 throw new IllegalStateException("Local audio track does not exist (yet)");
394 }
395 try {
396 return audioTrack.enabled();
397 } catch (final IllegalStateException e) {
398 //sometimes UI might still be rendering the buttons when a background thread has already ended the call
399 return false;
400 }
401 }
402
403 boolean setMicrophoneEnabled(final boolean enabled) {
404 final AudioTrack audioTrack = this.localAudioTrack;
405 if (audioTrack == null) {
406 throw new IllegalStateException("Local audio track does not exist (yet)");
407 }
408 try {
409 audioTrack.setEnabled(enabled);
410 return true;
411 } catch (final IllegalStateException e) {
412 Log.d(Config.LOGTAG, "unable to toggle microphone", e);
413 //ignoring race condition in case MediaStreamTrack has been disposed
414 return false;
415 }
416 }
417
418 boolean isVideoEnabled() {
419 final VideoTrack videoTrack = this.localVideoTrack;
420 if (videoTrack == null) {
421 return false;
422 }
423 return videoTrack.enabled();
424 }
425
426 void setVideoEnabled(final boolean enabled) {
427 final VideoTrack videoTrack = this.localVideoTrack;
428 if (videoTrack == null) {
429 throw new IllegalStateException("Local video track does not exist");
430 }
431 videoTrack.setEnabled(enabled);
432 }
433
434 synchronized ListenableFuture<SessionDescription> setLocalDescription() {
435 return Futures.transformAsync(getPeerConnectionFuture(), peerConnection -> {
436 final SettableFuture<SessionDescription> future = SettableFuture.create();
437 peerConnection.setLocalDescription(new SetSdpObserver() {
438 @Override
439 public void onSetSuccess() {
440 final SessionDescription description = peerConnection.getLocalDescription();
441 Log.d(EXTENDED_LOGGING_TAG, "set local description:");
442 logDescription(description);
443 future.set(description);
444 }
445
446 @Override
447 public void onSetFailure(final String message) {
448 future.setException(new FailureToSetDescriptionException(message));
449 }
450 });
451 return future;
452 }, MoreExecutors.directExecutor());
453 }
454
455 private static void logDescription(final SessionDescription sessionDescription) {
456 for (final String line : sessionDescription.description.split(eu.siacs.conversations.xmpp.jingle.SessionDescription.LINE_DIVIDER)) {
457 Log.d(EXTENDED_LOGGING_TAG, line);
458 }
459 }
460
461 synchronized ListenableFuture<Void> setRemoteDescription(final SessionDescription sessionDescription) {
462 Log.d(EXTENDED_LOGGING_TAG, "setting remote description:");
463 logDescription(sessionDescription);
464 return Futures.transformAsync(getPeerConnectionFuture(), peerConnection -> {
465 final SettableFuture<Void> future = SettableFuture.create();
466 peerConnection.setRemoteDescription(new SetSdpObserver() {
467 @Override
468 public void onSetSuccess() {
469 future.set(null);
470 }
471
472 @Override
473 public void onSetFailure(final String message) {
474 future.setException(new FailureToSetDescriptionException(message));
475 }
476 }, sessionDescription);
477 return future;
478 }, MoreExecutors.directExecutor());
479 }
480
481 @Nonnull
482 private ListenableFuture<PeerConnection> getPeerConnectionFuture() {
483 final PeerConnection peerConnection = this.peerConnection;
484 if (peerConnection == null) {
485 return Futures.immediateFailedFuture(new PeerConnectionNotInitialized());
486 } else {
487 return Futures.immediateFuture(peerConnection);
488 }
489 }
490
491 private PeerConnection requirePeerConnection() {
492 final PeerConnection peerConnection = this.peerConnection;
493 if (peerConnection == null) {
494 throw new PeerConnectionNotInitialized();
495 }
496 return peerConnection;
497 }
498
499 void addIceCandidate(IceCandidate iceCandidate) {
500 requirePeerConnection().addIceCandidate(iceCandidate);
501 }
502
503 private Optional<CapturerChoice> getVideoCapturer() {
504 final CameraEnumerator enumerator = new Camera2Enumerator(requireContext());
505 final Set<String> deviceNames = ImmutableSet.copyOf(enumerator.getDeviceNames());
506 for (final String deviceName : deviceNames) {
507 if (isFrontFacing(enumerator, deviceName)) {
508 final CapturerChoice capturerChoice = of(enumerator, deviceName, deviceNames);
509 if (capturerChoice == null) {
510 return Optional.absent();
511 }
512 capturerChoice.isFrontCamera = true;
513 return Optional.of(capturerChoice);
514 }
515 }
516 if (deviceNames.size() == 0) {
517 return Optional.absent();
518 } else {
519 return Optional.fromNullable(of(enumerator, Iterables.get(deviceNames, 0), deviceNames));
520 }
521 }
522
523 PeerConnection.PeerConnectionState getState() {
524 return requirePeerConnection().connectionState();
525 }
526
527 public PeerConnection.SignalingState getSignalingState() {
528 return requirePeerConnection().signalingState();
529 }
530
531
532 EglBase.Context getEglBaseContext() {
533 return this.eglBase.getEglBaseContext();
534 }
535
536 Optional<VideoTrack> getLocalVideoTrack() {
537 return Optional.fromNullable(this.localVideoTrack);
538 }
539
540 Optional<VideoTrack> getRemoteVideoTrack() {
541 return Optional.fromNullable(this.remoteVideoTrack);
542 }
543
544 private Context requireContext() {
545 final Context context = this.context;
546 if (context == null) {
547 throw new IllegalStateException("call setup first");
548 }
549 return context;
550 }
551
552 AppRTCAudioManager getAudioManager() {
553 return appRTCAudioManager;
554 }
555
556 void execute(final Runnable command) {
557 executorService.execute(command);
558 }
559
560 public interface EventCallback {
561 void onIceCandidate(IceCandidate iceCandidate);
562
563 void onConnectionChange(PeerConnection.PeerConnectionState newState);
564
565 void onAudioDeviceChanged(AppRTCAudioManager.AudioDevice selectedAudioDevice, Set<AppRTCAudioManager.AudioDevice> availableAudioDevices);
566
567 void onRenegotiationNeeded();
568 }
569
570 private static abstract class SetSdpObserver implements SdpObserver {
571
572 @Override
573 public void onCreateSuccess(org.webrtc.SessionDescription sessionDescription) {
574 throw new IllegalStateException("Not able to use SetSdpObserver");
575 }
576
577 @Override
578 public void onCreateFailure(String s) {
579 throw new IllegalStateException("Not able to use SetSdpObserver");
580 }
581
582 }
583
584 private static abstract class CreateSdpObserver implements SdpObserver {
585
586
587 @Override
588 public void onSetSuccess() {
589 throw new IllegalStateException("Not able to use CreateSdpObserver");
590 }
591
592
593 @Override
594 public void onSetFailure(String s) {
595 throw new IllegalStateException("Not able to use CreateSdpObserver");
596 }
597 }
598
599 static class InitializationException extends Exception {
600
601 private InitializationException(final String message, final Throwable throwable) {
602 super(message, throwable);
603 }
604
605 private InitializationException(final String message) {
606 super(message);
607 }
608 }
609
610 public static class PeerConnectionNotInitialized extends IllegalStateException {
611
612 private PeerConnectionNotInitialized() {
613 super("initialize PeerConnection first");
614 }
615
616 }
617
618 private static class FailureToSetDescriptionException extends IllegalArgumentException {
619 public FailureToSetDescriptionException(String message) {
620 super(message);
621 }
622 }
623
624 private static class CapturerChoice {
625 private final CameraVideoCapturer cameraVideoCapturer;
626 private final CameraEnumerationAndroid.CaptureFormat captureFormat;
627 private final Set<String> availableCameras;
628 private boolean isFrontCamera = false;
629
630 CapturerChoice(CameraVideoCapturer cameraVideoCapturer, CameraEnumerationAndroid.CaptureFormat captureFormat, Set<String> cameras) {
631 this.cameraVideoCapturer = cameraVideoCapturer;
632 this.captureFormat = captureFormat;
633 this.availableCameras = cameras;
634 }
635
636 int getFrameRate() {
637 return Math.max(captureFormat.framerate.min, Math.min(CAPTURING_MAX_FRAME_RATE, captureFormat.framerate.max));
638 }
639 }
640}