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