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.Camera1Enumerator;
21import org.webrtc.Camera2Enumerator;
22import org.webrtc.CameraEnumerationAndroid;
23import org.webrtc.CameraEnumerator;
24import org.webrtc.CameraVideoCapturer;
25import org.webrtc.CandidatePairChangeEvent;
26import org.webrtc.DataChannel;
27import org.webrtc.DefaultVideoDecoderFactory;
28import org.webrtc.DefaultVideoEncoderFactory;
29import org.webrtc.EglBase;
30import org.webrtc.IceCandidate;
31import org.webrtc.MediaConstraints;
32import org.webrtc.MediaStream;
33import org.webrtc.MediaStreamTrack;
34import org.webrtc.PeerConnection;
35import org.webrtc.PeerConnectionFactory;
36import org.webrtc.RtpReceiver;
37import org.webrtc.RtpTransceiver;
38import org.webrtc.SdpObserver;
39import org.webrtc.SessionDescription;
40import org.webrtc.SurfaceTextureHelper;
41import org.webrtc.VideoSource;
42import org.webrtc.VideoTrack;
43import org.webrtc.audio.JavaAudioDeviceModule;
44import org.webrtc.voiceengine.WebRtcAudioEffects;
45
46import java.util.ArrayList;
47import java.util.Collections;
48import java.util.List;
49import java.util.Set;
50
51import javax.annotation.Nonnull;
52import javax.annotation.Nullable;
53
54import eu.siacs.conversations.Config;
55import eu.siacs.conversations.services.AppRTCAudioManager;
56import eu.siacs.conversations.services.XmppConnectionService;
57
58public class WebRTCWrapper {
59
60 private static final String EXTENDED_LOGGING_TAG = WebRTCWrapper.class.getSimpleName();
61
62 //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
63 private static final Set<String> HARDWARE_AEC_BLACKLIST = new ImmutableSet.Builder<String>()
64 .add("Pixel")
65 .add("Pixel XL")
66 .add("Moto G5")
67 .add("Moto G (5S) Plus")
68 .add("Moto G4")
69 .add("TA-1053")
70 .add("Mi A1")
71 .add("Mi A2")
72 .add("E5823") // Sony z5 compact
73 .add("Redmi Note 5")
74 .add("FP2") // Fairphone FP2
75 .add("MI 5")
76 .build();
77
78 private static final int CAPTURING_RESOLUTION = 1920;
79 private static final int CAPTURING_MAX_FRAME_RATE = 30;
80
81 private final EventCallback eventCallback;
82 private final AppRTCAudioManager.AudioManagerEvents audioManagerEvents = new AppRTCAudioManager.AudioManagerEvents() {
83 @Override
84 public void onAudioDeviceChanged(AppRTCAudioManager.AudioDevice selectedAudioDevice, Set<AppRTCAudioManager.AudioDevice> availableAudioDevices) {
85 eventCallback.onAudioDeviceChanged(selectedAudioDevice, availableAudioDevices);
86 }
87 };
88 private final Handler mainHandler = new Handler(Looper.getMainLooper());
89 private VideoTrack localVideoTrack = null;
90 private VideoTrack remoteVideoTrack = null;
91 private final PeerConnection.Observer peerConnectionObserver = new PeerConnection.Observer() {
92 @Override
93 public void onSignalingChange(PeerConnection.SignalingState signalingState) {
94 Log.d(EXTENDED_LOGGING_TAG, "onSignalingChange(" + signalingState + ")");
95 //this is called after removeTrack or addTrack
96 //and should then trigger a content-add or content-remove or something
97 //https://developer.mozilla.org/en-US/docs/Web/API/RTCPeerConnection/removeTrack
98 }
99
100 @Override
101 public void onConnectionChange(PeerConnection.PeerConnectionState newState) {
102 eventCallback.onConnectionChange(newState);
103 }
104
105 @Override
106 public void onIceConnectionChange(PeerConnection.IceConnectionState iceConnectionState) {
107
108 }
109
110 @Override
111 public void onSelectedCandidatePairChanged(CandidatePairChangeEvent event) {
112 Log.d(Config.LOGTAG, "remote candidate selected: " + event.remote);
113 Log.d(Config.LOGTAG, "local candidate selected: " + event.local);
114 }
115
116 @Override
117 public void onIceConnectionReceivingChange(boolean b) {
118
119 }
120
121 @Override
122 public void onIceGatheringChange(PeerConnection.IceGatheringState iceGatheringState) {
123 Log.d(EXTENDED_LOGGING_TAG, "onIceGatheringChange(" + iceGatheringState + ")");
124 }
125
126 @Override
127 public void onIceCandidate(IceCandidate iceCandidate) {
128 eventCallback.onIceCandidate(iceCandidate);
129 }
130
131 @Override
132 public void onIceCandidatesRemoved(IceCandidate[] iceCandidates) {
133
134 }
135
136 @Override
137 public void onAddStream(MediaStream mediaStream) {
138 Log.d(EXTENDED_LOGGING_TAG, "onAddStream(numAudioTracks=" + mediaStream.audioTracks.size() + ",numVideoTracks=" + mediaStream.videoTracks.size() + ")");
139 final List<VideoTrack> videoTracks = mediaStream.videoTracks;
140 if (videoTracks.size() > 0) {
141 remoteVideoTrack = videoTracks.get(0);
142 Log.d(Config.LOGTAG, "remote video track enabled?=" + remoteVideoTrack.enabled());
143 } else {
144 Log.d(Config.LOGTAG, "no remote video tracks found");
145 }
146 }
147
148 @Override
149 public void onRemoveStream(MediaStream mediaStream) {
150
151 }
152
153 @Override
154 public void onDataChannel(DataChannel dataChannel) {
155
156 }
157
158 @Override
159 public void onRenegotiationNeeded() {
160
161 }
162
163 @Override
164 public void onAddTrack(RtpReceiver rtpReceiver, MediaStream[] mediaStreams) {
165 final MediaStreamTrack track = rtpReceiver.track();
166 Log.d(EXTENDED_LOGGING_TAG, "onAddTrack(kind=" + (track == null ? "null" : track.kind()) + ",numMediaStreams=" + mediaStreams.length + ")");
167 }
168
169 @Override
170 public void onTrack(RtpTransceiver transceiver) {
171 Log.d(EXTENDED_LOGGING_TAG, "onTrack(mid=" + transceiver.getMid() + ",media=" + transceiver.getMediaType() + ")");
172 }
173 };
174 @Nullable
175 private PeerConnection peerConnection = null;
176 private AudioTrack localAudioTrack = null;
177 private AppRTCAudioManager appRTCAudioManager = null;
178 private ToneManager toneManager = null;
179 private Context context = null;
180 private EglBase eglBase = null;
181 private CapturerChoice capturerChoice;
182
183 WebRTCWrapper(final EventCallback eventCallback) {
184 this.eventCallback = eventCallback;
185 }
186
187 private static void dispose(final PeerConnection peerConnection) {
188 try {
189 peerConnection.dispose();
190 } catch (final IllegalStateException e) {
191 Log.e(Config.LOGTAG, "unable to dispose of peer connection", e);
192 }
193 }
194
195 @Nullable
196 private static CapturerChoice of(CameraEnumerator enumerator, final String deviceName, Set<String> availableCameras) {
197 final CameraVideoCapturer capturer = enumerator.createCapturer(deviceName, null);
198 if (capturer == null) {
199 return null;
200 }
201 final ArrayList<CameraEnumerationAndroid.CaptureFormat> choices = new ArrayList<>(enumerator.getSupportedFormats(deviceName));
202 Collections.sort(choices, (a, b) -> b.width - a.width);
203 for (final CameraEnumerationAndroid.CaptureFormat captureFormat : choices) {
204 if (captureFormat.width <= CAPTURING_RESOLUTION) {
205 return new CapturerChoice(capturer, captureFormat, availableCameras);
206 }
207 }
208 return null;
209 }
210
211 private static boolean isFrontFacing(final CameraEnumerator cameraEnumerator, final String deviceName) {
212 try {
213 return cameraEnumerator.isFrontFacing(deviceName);
214 } catch (final NullPointerException e) {
215 return false;
216 }
217 }
218
219 public void setup(final XmppConnectionService service, final AppRTCAudioManager.SpeakerPhonePreference speakerPhonePreference) throws InitializationException {
220 try {
221 PeerConnectionFactory.initialize(
222 PeerConnectionFactory.InitializationOptions.builder(service).createInitializationOptions()
223 );
224 } catch (final UnsatisfiedLinkError e) {
225 throw new InitializationException("Unable to initialize PeerConnectionFactory", e);
226 }
227 try {
228 this.eglBase = EglBase.create();
229 } catch (final RuntimeException e) {
230 throw new InitializationException("Unable to create EGL base", e);
231 }
232 this.context = service;
233 this.toneManager = service.getJingleConnectionManager().toneManager;
234 mainHandler.post(() -> {
235 appRTCAudioManager = AppRTCAudioManager.create(service, speakerPhonePreference);
236 toneManager.setAppRtcAudioManagerHasControl(true);
237 appRTCAudioManager.start(audioManagerEvents);
238 eventCallback.onAudioDeviceChanged(appRTCAudioManager.getSelectedAudioDevice(), appRTCAudioManager.getAudioDevices());
239 });
240 }
241
242 synchronized void initializePeerConnection(final Set<Media> media, final List<PeerConnection.IceServer> iceServers) throws InitializationException {
243 Preconditions.checkState(this.eglBase != null);
244 Preconditions.checkNotNull(media);
245 Preconditions.checkArgument(media.size() > 0, "media can not be empty when initializing peer connection");
246 final boolean setUseHardwareAcousticEchoCanceler = WebRtcAudioEffects.canUseAcousticEchoCanceler() && !HARDWARE_AEC_BLACKLIST.contains(Build.MODEL);
247 Log.d(Config.LOGTAG, String.format("setUseHardwareAcousticEchoCanceler(%s) model=%s", setUseHardwareAcousticEchoCanceler, Build.MODEL));
248 PeerConnectionFactory peerConnectionFactory = PeerConnectionFactory.builder()
249 .setVideoDecoderFactory(new DefaultVideoDecoderFactory(eglBase.getEglBaseContext()))
250 .setVideoEncoderFactory(new DefaultVideoEncoderFactory(eglBase.getEglBaseContext(), true, true))
251 .setAudioDeviceModule(JavaAudioDeviceModule.builder(context)
252 .setUseHardwareAcousticEchoCanceler(setUseHardwareAcousticEchoCanceler)
253 .createAudioDeviceModule()
254 )
255 .createPeerConnectionFactory();
256
257
258 final PeerConnection.RTCConfiguration rtcConfig = new PeerConnection.RTCConfiguration(iceServers);
259 rtcConfig.tcpCandidatePolicy = PeerConnection.TcpCandidatePolicy.DISABLED; //XEP-0176 doesn't support tcp
260 rtcConfig.continualGatheringPolicy = PeerConnection.ContinualGatheringPolicy.GATHER_CONTINUALLY;
261 rtcConfig.sdpSemantics = PeerConnection.SdpSemantics.UNIFIED_PLAN;
262 final PeerConnection peerConnection = peerConnectionFactory.createPeerConnection(rtcConfig, peerConnectionObserver);
263 if (peerConnection == null) {
264 throw new InitializationException("Unable to create PeerConnection");
265 }
266
267 final Optional<CapturerChoice> optionalCapturerChoice = media.contains(Media.VIDEO) ? getVideoCapturer() : Optional.absent();
268
269 if (optionalCapturerChoice.isPresent()) {
270 this.capturerChoice = optionalCapturerChoice.get();
271 final CameraVideoCapturer capturer = this.capturerChoice.cameraVideoCapturer;
272 final VideoSource videoSource = peerConnectionFactory.createVideoSource(false);
273 SurfaceTextureHelper surfaceTextureHelper = SurfaceTextureHelper.create("webrtc", eglBase.getEglBaseContext());
274 capturer.initialize(surfaceTextureHelper, requireContext(), videoSource.getCapturerObserver());
275 Log.d(Config.LOGTAG, String.format("start capturing at %dx%d@%d", capturerChoice.captureFormat.width, capturerChoice.captureFormat.height, capturerChoice.getFrameRate()));
276 capturer.startCapture(capturerChoice.captureFormat.width, capturerChoice.captureFormat.height, capturerChoice.getFrameRate());
277
278 this.localVideoTrack = peerConnectionFactory.createVideoTrack("my-video-track", videoSource);
279
280 peerConnection.addTrack(this.localVideoTrack);
281 }
282
283
284 if (media.contains(Media.AUDIO)) {
285 //set up audio track
286 final AudioSource audioSource = peerConnectionFactory.createAudioSource(new MediaConstraints());
287 this.localAudioTrack = peerConnectionFactory.createAudioTrack("my-audio-track", audioSource);
288 peerConnection.addTrack(this.localAudioTrack);
289 }
290 peerConnection.setAudioPlayout(true);
291 peerConnection.setAudioRecording(true);
292 this.peerConnection = peerConnection;
293 }
294
295 synchronized void close() {
296 final PeerConnection peerConnection = this.peerConnection;
297 final CapturerChoice capturerChoice = this.capturerChoice;
298 final AppRTCAudioManager audioManager = this.appRTCAudioManager;
299 final EglBase eglBase = this.eglBase;
300 if (peerConnection != null) {
301 dispose(peerConnection);
302 this.peerConnection = null;
303 }
304 if (audioManager != null) {
305 toneManager.setAppRtcAudioManagerHasControl(false);
306 mainHandler.post(audioManager::stop);
307 }
308 this.localVideoTrack = null;
309 this.remoteVideoTrack = null;
310 if (capturerChoice != null) {
311 try {
312 capturerChoice.cameraVideoCapturer.stopCapture();
313 } catch (InterruptedException e) {
314 Log.e(Config.LOGTAG, "unable to stop capturing");
315 }
316 }
317 if (eglBase != null) {
318 eglBase.release();
319 this.eglBase = null;
320 }
321 }
322
323 synchronized void verifyClosed() {
324 if (this.peerConnection != null
325 || this.eglBase != null
326 || this.localVideoTrack != null
327 || this.remoteVideoTrack != null) {
328 final IllegalStateException e = new IllegalStateException("WebRTCWrapper hasn't been closed properly");
329 Log.e(Config.LOGTAG, "verifyClosed() failed. Going to throw", e);
330 throw e;
331 }
332 }
333
334 boolean isCameraSwitchable() {
335 final CapturerChoice capturerChoice = this.capturerChoice;
336 return capturerChoice != null && capturerChoice.availableCameras.size() > 1;
337 }
338
339 boolean isFrontCamera() {
340 final CapturerChoice capturerChoice = this.capturerChoice;
341 return capturerChoice == null || capturerChoice.isFrontCamera;
342 }
343
344 ListenableFuture<Boolean> switchCamera() {
345 final CapturerChoice capturerChoice = this.capturerChoice;
346 if (capturerChoice == null) {
347 return Futures.immediateFailedFuture(new IllegalStateException("CameraCapturer has not been initialized"));
348 }
349 final SettableFuture<Boolean> future = SettableFuture.create();
350 capturerChoice.cameraVideoCapturer.switchCamera(new CameraVideoCapturer.CameraSwitchHandler() {
351 @Override
352 public void onCameraSwitchDone(boolean isFrontCamera) {
353 capturerChoice.isFrontCamera = isFrontCamera;
354 future.set(isFrontCamera);
355 }
356
357 @Override
358 public void onCameraSwitchError(final String message) {
359 future.setException(new IllegalStateException(String.format("Unable to switch camera %s", message)));
360 }
361 });
362 return future;
363 }
364
365 boolean isMicrophoneEnabled() {
366 final AudioTrack audioTrack = this.localAudioTrack;
367 if (audioTrack == null) {
368 throw new IllegalStateException("Local audio track does not exist (yet)");
369 }
370 try {
371 return audioTrack.enabled();
372 } catch (final IllegalStateException e) {
373 //sometimes UI might still be rendering the buttons when a background thread has already ended the call
374 return false;
375 }
376 }
377
378 boolean setMicrophoneEnabled(final boolean enabled) {
379 final AudioTrack audioTrack = this.localAudioTrack;
380 if (audioTrack == null) {
381 throw new IllegalStateException("Local audio track does not exist (yet)");
382 }
383 try {
384 audioTrack.setEnabled(enabled);
385 return true;
386 } catch (final IllegalStateException e) {
387 Log.d(Config.LOGTAG, "unable to toggle microphone", e);
388 //ignoring race condition in case MediaStreamTrack has been disposed
389 return false;
390 }
391 }
392
393 boolean isVideoEnabled() {
394 final VideoTrack videoTrack = this.localVideoTrack;
395 if (videoTrack == null) {
396 return false;
397 }
398 return videoTrack.enabled();
399 }
400
401 void setVideoEnabled(final boolean enabled) {
402 final VideoTrack videoTrack = this.localVideoTrack;
403 if (videoTrack == null) {
404 throw new IllegalStateException("Local video track does not exist");
405 }
406 videoTrack.setEnabled(enabled);
407 }
408
409 ListenableFuture<SessionDescription> createOffer() {
410 return Futures.transformAsync(getPeerConnectionFuture(), peerConnection -> {
411 final SettableFuture<SessionDescription> future = SettableFuture.create();
412 peerConnection.createOffer(new CreateSdpObserver() {
413 @Override
414 public void onCreateSuccess(SessionDescription sessionDescription) {
415 future.set(sessionDescription);
416 }
417
418 @Override
419 public void onCreateFailure(String s) {
420 future.setException(new IllegalStateException("Unable to create offer: " + s));
421 }
422 }, new MediaConstraints());
423 return future;
424 }, MoreExecutors.directExecutor());
425 }
426
427 ListenableFuture<SessionDescription> createAnswer() {
428 return Futures.transformAsync(getPeerConnectionFuture(), peerConnection -> {
429 final SettableFuture<SessionDescription> future = SettableFuture.create();
430 peerConnection.createAnswer(new CreateSdpObserver() {
431 @Override
432 public void onCreateSuccess(SessionDescription sessionDescription) {
433 future.set(sessionDescription);
434 }
435
436 @Override
437 public void onCreateFailure(String s) {
438 future.setException(new IllegalStateException("Unable to create answer: " + s));
439 }
440 }, new MediaConstraints());
441 return future;
442 }, MoreExecutors.directExecutor());
443 }
444
445 ListenableFuture<Void> setLocalDescription(final SessionDescription sessionDescription) {
446 Log.d(EXTENDED_LOGGING_TAG, "setting local description:");
447 for (final String line : sessionDescription.description.split(eu.siacs.conversations.xmpp.jingle.SessionDescription.LINE_DIVIDER)) {
448 Log.d(EXTENDED_LOGGING_TAG, line);
449 }
450 return Futures.transformAsync(getPeerConnectionFuture(), peerConnection -> {
451 final SettableFuture<Void> future = SettableFuture.create();
452 peerConnection.setLocalDescription(new SetSdpObserver() {
453 @Override
454 public void onSetSuccess() {
455 future.set(null);
456 }
457
458 @Override
459 public void onSetFailure(final String s) {
460 future.setException(new IllegalArgumentException("unable to set local session description: " + s));
461
462 }
463 }, sessionDescription);
464 return future;
465 }, MoreExecutors.directExecutor());
466 }
467
468 ListenableFuture<Void> setRemoteDescription(final SessionDescription sessionDescription) {
469 Log.d(EXTENDED_LOGGING_TAG, "setting remote description:");
470 for (final String line : sessionDescription.description.split(eu.siacs.conversations.xmpp.jingle.SessionDescription.LINE_DIVIDER)) {
471 Log.d(EXTENDED_LOGGING_TAG, line);
472 }
473 return Futures.transformAsync(getPeerConnectionFuture(), peerConnection -> {
474 final SettableFuture<Void> future = SettableFuture.create();
475 peerConnection.setRemoteDescription(new SetSdpObserver() {
476 @Override
477 public void onSetSuccess() {
478 future.set(null);
479 }
480
481 @Override
482 public void onSetFailure(String s) {
483 future.setException(new IllegalArgumentException("unable to set remote session description: " + s));
484
485 }
486 }, sessionDescription);
487 return future;
488 }, MoreExecutors.directExecutor());
489 }
490
491 @Nonnull
492 private ListenableFuture<PeerConnection> getPeerConnectionFuture() {
493 final PeerConnection peerConnection = this.peerConnection;
494 if (peerConnection == null) {
495 return Futures.immediateFailedFuture(new IllegalStateException("initialize PeerConnection first"));
496 } else {
497 return Futures.immediateFuture(peerConnection);
498 }
499 }
500
501 void addIceCandidate(IceCandidate iceCandidate) {
502 requirePeerConnection().addIceCandidate(iceCandidate);
503 }
504
505 private CameraEnumerator getCameraEnumerator() {
506 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
507 return new Camera2Enumerator(requireContext());
508 } else {
509 return new Camera1Enumerator();
510 }
511 }
512
513 private Optional<CapturerChoice> getVideoCapturer() {
514 final CameraEnumerator enumerator = getCameraEnumerator();
515 final Set<String> deviceNames = ImmutableSet.copyOf(enumerator.getDeviceNames());
516 for (final String deviceName : deviceNames) {
517 if (isFrontFacing(enumerator, deviceName)) {
518 final CapturerChoice capturerChoice = of(enumerator, deviceName, deviceNames);
519 if (capturerChoice == null) {
520 return Optional.absent();
521 }
522 capturerChoice.isFrontCamera = true;
523 return Optional.of(capturerChoice);
524 }
525 }
526 if (deviceNames.size() == 0) {
527 return Optional.absent();
528 } else {
529 return Optional.fromNullable(of(enumerator, Iterables.get(deviceNames, 0), deviceNames));
530 }
531 }
532
533 public PeerConnection.PeerConnectionState getState() {
534 return requirePeerConnection().connectionState();
535 }
536
537 EglBase.Context getEglBaseContext() {
538 return this.eglBase.getEglBaseContext();
539 }
540
541 Optional<VideoTrack> getLocalVideoTrack() {
542 return Optional.fromNullable(this.localVideoTrack);
543 }
544
545 Optional<VideoTrack> getRemoteVideoTrack() {
546 return Optional.fromNullable(this.remoteVideoTrack);
547 }
548
549 private PeerConnection requirePeerConnection() {
550 final PeerConnection peerConnection = this.peerConnection;
551 if (peerConnection == null) {
552 throw new PeerConnectionNotInitialized();
553 }
554 return peerConnection;
555 }
556
557 private Context requireContext() {
558 final Context context = this.context;
559 if (context == null) {
560 throw new IllegalStateException("call setup first");
561 }
562 return context;
563 }
564
565 AppRTCAudioManager getAudioManager() {
566 return appRTCAudioManager;
567 }
568
569 public interface EventCallback {
570 void onIceCandidate(IceCandidate iceCandidate);
571
572 void onConnectionChange(PeerConnection.PeerConnectionState newState);
573
574 void onAudioDeviceChanged(AppRTCAudioManager.AudioDevice selectedAudioDevice, Set<AppRTCAudioManager.AudioDevice> availableAudioDevices);
575 }
576
577 private static abstract class SetSdpObserver implements SdpObserver {
578
579 @Override
580 public void onCreateSuccess(org.webrtc.SessionDescription sessionDescription) {
581 throw new IllegalStateException("Not able to use SetSdpObserver");
582 }
583
584 @Override
585 public void onCreateFailure(String s) {
586 throw new IllegalStateException("Not able to use SetSdpObserver");
587 }
588
589 }
590
591 private static abstract class CreateSdpObserver implements SdpObserver {
592
593
594 @Override
595 public void onSetSuccess() {
596 throw new IllegalStateException("Not able to use CreateSdpObserver");
597 }
598
599
600 @Override
601 public void onSetFailure(String s) {
602 throw new IllegalStateException("Not able to use CreateSdpObserver");
603 }
604 }
605
606 static class InitializationException extends Exception {
607
608 private InitializationException(final String message, final Throwable throwable) {
609 super(message, throwable);
610 }
611
612 private InitializationException(final String message) {
613 super(message);
614 }
615 }
616
617 public static class PeerConnectionNotInitialized extends IllegalStateException {
618
619 private PeerConnectionNotInitialized() {
620 super("initialize PeerConnection first");
621 }
622
623 }
624
625 private static class CapturerChoice {
626 private final CameraVideoCapturer cameraVideoCapturer;
627 private final CameraEnumerationAndroid.CaptureFormat captureFormat;
628 private final Set<String> availableCameras;
629 private boolean isFrontCamera = false;
630
631 CapturerChoice(CameraVideoCapturer cameraVideoCapturer, CameraEnumerationAndroid.CaptureFormat captureFormat, Set<String> cameras) {
632 this.cameraVideoCapturer = cameraVideoCapturer;
633 this.captureFormat = captureFormat;
634 this.availableCameras = cameras;
635 }
636
637 int getFrameRate() {
638 return Math.max(captureFormat.framerate.min, Math.min(CAPTURING_MAX_FRAME_RATE, captureFormat.framerate.max));
639 }
640 }
641}