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