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 public void setup(final XmppConnectionService service, final AppRTCAudioManager.SpeakerPhonePreference speakerPhonePreference) throws InitializationException {
212 try {
213 PeerConnectionFactory.initialize(
214 PeerConnectionFactory.InitializationOptions.builder(service).createInitializationOptions()
215 );
216 } catch (final UnsatisfiedLinkError e) {
217 throw new InitializationException("Unable to initialize PeerConnectionFactory", e);
218 }
219 try {
220 this.eglBase = EglBase.create();
221 } catch (final RuntimeException e) {
222 throw new InitializationException("Unable to create EGL base", e);
223 }
224 this.context = service;
225 this.toneManager = service.getJingleConnectionManager().toneManager;
226 mainHandler.post(() -> {
227 appRTCAudioManager = AppRTCAudioManager.create(service, speakerPhonePreference);
228 toneManager.setAppRtcAudioManagerHasControl(true);
229 appRTCAudioManager.start(audioManagerEvents);
230 eventCallback.onAudioDeviceChanged(appRTCAudioManager.getSelectedAudioDevice(), appRTCAudioManager.getAudioDevices());
231 });
232 }
233
234 synchronized void initializePeerConnection(final Set<Media> media, final List<PeerConnection.IceServer> iceServers) throws InitializationException {
235 Preconditions.checkState(this.eglBase != null);
236 Preconditions.checkNotNull(media);
237 Preconditions.checkArgument(media.size() > 0, "media can not be empty when initializing peer connection");
238 final boolean setUseHardwareAcousticEchoCanceler = WebRtcAudioEffects.canUseAcousticEchoCanceler() && !HARDWARE_AEC_BLACKLIST.contains(Build.MODEL);
239 Log.d(Config.LOGTAG, String.format("setUseHardwareAcousticEchoCanceler(%s) model=%s", setUseHardwareAcousticEchoCanceler, Build.MODEL));
240 PeerConnectionFactory peerConnectionFactory = PeerConnectionFactory.builder()
241 .setVideoDecoderFactory(new DefaultVideoDecoderFactory(eglBase.getEglBaseContext()))
242 .setVideoEncoderFactory(new DefaultVideoEncoderFactory(eglBase.getEglBaseContext(), true, true))
243 .setAudioDeviceModule(JavaAudioDeviceModule.builder(context)
244 .setUseHardwareAcousticEchoCanceler(setUseHardwareAcousticEchoCanceler)
245 .createAudioDeviceModule()
246 )
247 .createPeerConnectionFactory();
248
249
250 final MediaStream stream = peerConnectionFactory.createLocalMediaStream("my-media-stream");
251
252 final Optional<CapturerChoice> optionalCapturerChoice = media.contains(Media.VIDEO) ? getVideoCapturer() : Optional.absent();
253
254 if (optionalCapturerChoice.isPresent()) {
255 this.capturerChoice = optionalCapturerChoice.get();
256 final CameraVideoCapturer capturer = this.capturerChoice.cameraVideoCapturer;
257 final VideoSource videoSource = peerConnectionFactory.createVideoSource(false);
258 SurfaceTextureHelper surfaceTextureHelper = SurfaceTextureHelper.create("webrtc", eglBase.getEglBaseContext());
259 capturer.initialize(surfaceTextureHelper, requireContext(), videoSource.getCapturerObserver());
260 Log.d(Config.LOGTAG, String.format("start capturing at %dx%d@%d", capturerChoice.captureFormat.width, capturerChoice.captureFormat.height, capturerChoice.getFrameRate()));
261 capturer.startCapture(capturerChoice.captureFormat.width, capturerChoice.captureFormat.height, capturerChoice.getFrameRate());
262
263 this.localVideoTrack = peerConnectionFactory.createVideoTrack("my-video-track", videoSource);
264
265 stream.addTrack(this.localVideoTrack);
266 }
267
268
269 if (media.contains(Media.AUDIO)) {
270 //set up audio track
271 final AudioSource audioSource = peerConnectionFactory.createAudioSource(new MediaConstraints());
272 this.localAudioTrack = peerConnectionFactory.createAudioTrack("my-audio-track", audioSource);
273 stream.addTrack(this.localAudioTrack);
274 }
275
276
277 final PeerConnection.RTCConfiguration rtcConfig = new PeerConnection.RTCConfiguration(iceServers);
278 rtcConfig.tcpCandidatePolicy = PeerConnection.TcpCandidatePolicy.DISABLED; //XEP-0176 doesn't support tcp
279 rtcConfig.continualGatheringPolicy = PeerConnection.ContinualGatheringPolicy.GATHER_CONTINUALLY;
280 final PeerConnection peerConnection = peerConnectionFactory.createPeerConnection(rtcConfig, peerConnectionObserver);
281 if (peerConnection == null) {
282 throw new InitializationException("Unable to create PeerConnection");
283 }
284 peerConnection.addStream(stream);
285 peerConnection.setAudioPlayout(true);
286 peerConnection.setAudioRecording(true);
287 this.peerConnection = peerConnection;
288 }
289
290 synchronized void close() {
291 final PeerConnection peerConnection = this.peerConnection;
292 final CapturerChoice capturerChoice = this.capturerChoice;
293 final AppRTCAudioManager audioManager = this.appRTCAudioManager;
294 final EglBase eglBase = this.eglBase;
295 if (peerConnection != null) {
296 dispose(peerConnection);
297 this.peerConnection = null;
298 }
299 if (audioManager != null) {
300 toneManager.setAppRtcAudioManagerHasControl(false);
301 mainHandler.post(audioManager::stop);
302 }
303 this.localVideoTrack = null;
304 this.remoteVideoTrack = null;
305 if (capturerChoice != null) {
306 try {
307 capturerChoice.cameraVideoCapturer.stopCapture();
308 } catch (InterruptedException e) {
309 Log.e(Config.LOGTAG, "unable to stop capturing");
310 }
311 }
312 if (eglBase != null) {
313 eglBase.release();
314 this.eglBase = null;
315 }
316 }
317
318 synchronized void verifyClosed() {
319 if (this.peerConnection != null
320 || this.eglBase != null
321 || this.localVideoTrack != null
322 || this.remoteVideoTrack != null) {
323 final IllegalStateException e = new IllegalStateException("WebRTCWrapper hasn't been closed properly");
324 Log.e(Config.LOGTAG, "verifyClosed() failed. Going to throw", e);
325 throw e;
326 }
327 }
328
329 boolean isCameraSwitchable() {
330 final CapturerChoice capturerChoice = this.capturerChoice;
331 return capturerChoice != null && capturerChoice.availableCameras.size() > 1;
332 }
333
334 boolean isFrontCamera() {
335 final CapturerChoice capturerChoice = this.capturerChoice;
336 return capturerChoice == null || capturerChoice.isFrontCamera;
337 }
338
339 ListenableFuture<Boolean> switchCamera() {
340 final CapturerChoice capturerChoice = this.capturerChoice;
341 if (capturerChoice == null) {
342 return Futures.immediateFailedFuture(new IllegalStateException("CameraCapturer has not been initialized"));
343 }
344 final SettableFuture<Boolean> future = SettableFuture.create();
345 capturerChoice.cameraVideoCapturer.switchCamera(new CameraVideoCapturer.CameraSwitchHandler() {
346 @Override
347 public void onCameraSwitchDone(boolean isFrontCamera) {
348 capturerChoice.isFrontCamera = isFrontCamera;
349 future.set(isFrontCamera);
350 }
351
352 @Override
353 public void onCameraSwitchError(final String message) {
354 future.setException(new IllegalStateException(String.format("Unable to switch camera %s", message)));
355 }
356 });
357 return future;
358 }
359
360 boolean isMicrophoneEnabled() {
361 final AudioTrack audioTrack = this.localAudioTrack;
362 if (audioTrack == null) {
363 throw new IllegalStateException("Local audio track does not exist (yet)");
364 }
365 try {
366 return audioTrack.enabled();
367 } catch (final IllegalStateException e) {
368 //sometimes UI might still be rendering the buttons when a background thread has already ended the call
369 return false;
370 }
371 }
372
373 boolean setMicrophoneEnabled(final boolean enabled) {
374 final AudioTrack audioTrack = this.localAudioTrack;
375 if (audioTrack == null) {
376 throw new IllegalStateException("Local audio track does not exist (yet)");
377 }
378 try {
379 audioTrack.setEnabled(enabled);
380 return true;
381 } catch (final IllegalStateException e) {
382 Log.d(Config.LOGTAG, "unable to toggle microphone", e);
383 //ignoring race condition in case MediaStreamTrack has been disposed
384 return false;
385 }
386 }
387
388 boolean isVideoEnabled() {
389 final VideoTrack videoTrack = this.localVideoTrack;
390 if (videoTrack == null) {
391 throw new IllegalStateException("Local video track does not exist");
392 }
393 return videoTrack.enabled();
394 }
395
396 void setVideoEnabled(final boolean enabled) {
397 final VideoTrack videoTrack = this.localVideoTrack;
398 if (videoTrack == null) {
399 throw new IllegalStateException("Local video track does not exist");
400 }
401 videoTrack.setEnabled(enabled);
402 }
403
404 ListenableFuture<SessionDescription> createOffer() {
405 return Futures.transformAsync(getPeerConnectionFuture(), peerConnection -> {
406 final SettableFuture<SessionDescription> future = SettableFuture.create();
407 peerConnection.createOffer(new CreateSdpObserver() {
408 @Override
409 public void onCreateSuccess(SessionDescription sessionDescription) {
410 future.set(sessionDescription);
411 }
412
413 @Override
414 public void onCreateFailure(String s) {
415 future.setException(new IllegalStateException("Unable to create offer: " + s));
416 }
417 }, new MediaConstraints());
418 return future;
419 }, MoreExecutors.directExecutor());
420 }
421
422 ListenableFuture<SessionDescription> createAnswer() {
423 return Futures.transformAsync(getPeerConnectionFuture(), peerConnection -> {
424 final SettableFuture<SessionDescription> future = SettableFuture.create();
425 peerConnection.createAnswer(new CreateSdpObserver() {
426 @Override
427 public void onCreateSuccess(SessionDescription sessionDescription) {
428 future.set(sessionDescription);
429 }
430
431 @Override
432 public void onCreateFailure(String s) {
433 future.setException(new IllegalStateException("Unable to create answer: " + s));
434 }
435 }, new MediaConstraints());
436 return future;
437 }, MoreExecutors.directExecutor());
438 }
439
440 ListenableFuture<Void> setLocalDescription(final SessionDescription sessionDescription) {
441 Log.d(EXTENDED_LOGGING_TAG, "setting local description:");
442 for (final String line : sessionDescription.description.split(eu.siacs.conversations.xmpp.jingle.SessionDescription.LINE_DIVIDER)) {
443 Log.d(EXTENDED_LOGGING_TAG, line);
444 }
445 return Futures.transformAsync(getPeerConnectionFuture(), peerConnection -> {
446 final SettableFuture<Void> future = SettableFuture.create();
447 peerConnection.setLocalDescription(new SetSdpObserver() {
448 @Override
449 public void onSetSuccess() {
450 future.set(null);
451 }
452
453 @Override
454 public void onSetFailure(final String s) {
455 future.setException(new IllegalArgumentException("unable to set local session description: " + s));
456
457 }
458 }, sessionDescription);
459 return future;
460 }, MoreExecutors.directExecutor());
461 }
462
463 ListenableFuture<Void> setRemoteDescription(final SessionDescription sessionDescription) {
464 Log.d(EXTENDED_LOGGING_TAG, "setting remote description:");
465 for (final String line : sessionDescription.description.split(eu.siacs.conversations.xmpp.jingle.SessionDescription.LINE_DIVIDER)) {
466 Log.d(EXTENDED_LOGGING_TAG, line);
467 }
468 return Futures.transformAsync(getPeerConnectionFuture(), peerConnection -> {
469 final SettableFuture<Void> future = SettableFuture.create();
470 peerConnection.setRemoteDescription(new SetSdpObserver() {
471 @Override
472 public void onSetSuccess() {
473 future.set(null);
474 }
475
476 @Override
477 public void onSetFailure(String s) {
478 future.setException(new IllegalArgumentException("unable to set remote session description: " + s));
479
480 }
481 }, sessionDescription);
482 return future;
483 }, MoreExecutors.directExecutor());
484 }
485
486 @Nonnull
487 private ListenableFuture<PeerConnection> getPeerConnectionFuture() {
488 final PeerConnection peerConnection = this.peerConnection;
489 if (peerConnection == null) {
490 return Futures.immediateFailedFuture(new IllegalStateException("initialize PeerConnection first"));
491 } else {
492 return Futures.immediateFuture(peerConnection);
493 }
494 }
495
496 void addIceCandidate(IceCandidate iceCandidate) {
497 requirePeerConnection().addIceCandidate(iceCandidate);
498 }
499
500 private CameraEnumerator getCameraEnumerator() {
501 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
502 return new Camera2Enumerator(requireContext());
503 } else {
504 return new Camera1Enumerator();
505 }
506 }
507
508 private Optional<CapturerChoice> getVideoCapturer() {
509 final CameraEnumerator enumerator = getCameraEnumerator();
510 final Set<String> deviceNames = ImmutableSet.copyOf(enumerator.getDeviceNames());
511 for (final String deviceName : deviceNames) {
512 if (isFrontFacing(enumerator, deviceName)) {
513 final CapturerChoice capturerChoice = of(enumerator, deviceName, deviceNames);
514 if (capturerChoice == null) {
515 return Optional.absent();
516 }
517 capturerChoice.isFrontCamera = true;
518 return Optional.of(capturerChoice);
519 }
520 }
521 if (deviceNames.size() == 0) {
522 return Optional.absent();
523 } else {
524 return Optional.fromNullable(of(enumerator, Iterables.get(deviceNames, 0), deviceNames));
525 }
526 }
527
528 private static boolean isFrontFacing(final CameraEnumerator cameraEnumerator, final String deviceName) {
529 try {
530 return cameraEnumerator.isFrontFacing(deviceName);
531 } catch (final NullPointerException e) {
532 return false;
533 }
534 }
535
536 public PeerConnection.PeerConnectionState getState() {
537 return requirePeerConnection().connectionState();
538 }
539
540 EglBase.Context getEglBaseContext() {
541 return this.eglBase.getEglBaseContext();
542 }
543
544 Optional<VideoTrack> getLocalVideoTrack() {
545 return Optional.fromNullable(this.localVideoTrack);
546 }
547
548 Optional<VideoTrack> getRemoteVideoTrack() {
549 return Optional.fromNullable(this.remoteVideoTrack);
550 }
551
552 private PeerConnection requirePeerConnection() {
553 final PeerConnection peerConnection = this.peerConnection;
554 if (peerConnection == null) {
555 throw new IllegalStateException("initialize PeerConnection first");
556 }
557 return peerConnection;
558 }
559
560 private Context requireContext() {
561 final Context context = this.context;
562 if (context == null) {
563 throw new IllegalStateException("call setup first");
564 }
565 return context;
566 }
567
568 AppRTCAudioManager getAudioManager() {
569 return appRTCAudioManager;
570 }
571
572 public interface EventCallback {
573 void onIceCandidate(IceCandidate iceCandidate);
574
575 void onConnectionChange(PeerConnection.PeerConnectionState newState);
576
577 void onAudioDeviceChanged(AppRTCAudioManager.AudioDevice selectedAudioDevice, Set<AppRTCAudioManager.AudioDevice> availableAudioDevices);
578 }
579
580 private static abstract class SetSdpObserver implements SdpObserver {
581
582 @Override
583 public void onCreateSuccess(org.webrtc.SessionDescription sessionDescription) {
584 throw new IllegalStateException("Not able to use SetSdpObserver");
585 }
586
587 @Override
588 public void onCreateFailure(String s) {
589 throw new IllegalStateException("Not able to use SetSdpObserver");
590 }
591
592 }
593
594 private static abstract class CreateSdpObserver implements SdpObserver {
595
596
597 @Override
598 public void onSetSuccess() {
599 throw new IllegalStateException("Not able to use CreateSdpObserver");
600 }
601
602
603 @Override
604 public void onSetFailure(String s) {
605 throw new IllegalStateException("Not able to use CreateSdpObserver");
606 }
607 }
608
609 static class InitializationException extends Exception {
610
611 private InitializationException(final String message, final Throwable throwable) {
612 super(message, throwable);
613 }
614
615 private InitializationException(final String message) {
616 super(message);
617 }
618 }
619
620 private static class CapturerChoice {
621 private final CameraVideoCapturer cameraVideoCapturer;
622 private final CameraEnumerationAndroid.CaptureFormat captureFormat;
623 private final Set<String> availableCameras;
624 private boolean isFrontCamera = false;
625
626 CapturerChoice(CameraVideoCapturer cameraVideoCapturer, CameraEnumerationAndroid.CaptureFormat captureFormat, Set<String> cameras) {
627 this.cameraVideoCapturer = cameraVideoCapturer;
628 this.captureFormat = captureFormat;
629 this.availableCameras = cameras;
630 }
631
632 int getFrameRate() {
633 return Math.max(captureFormat.framerate.min, Math.min(CAPTURING_MAX_FRAME_RATE, captureFormat.framerate.max));
634 }
635 }
636}