feat(iOS): screensharing support

The Jitsi team would like to thank @AliKarpuzoglu, @linuxpi and The Hopp Foundation for the initial effort and help throughout.

ios/app/JitsiMeetBroadcast Extension/DarwinNotificationCenter.h

@@ -0,0 +1,31 @@
+/*
+ * Copyright @ 2021-present 8x8, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+extern NSNotificationName const kBroadcastStartedNotification;
+extern NSNotificationName const kBroadcastStoppedNotification;
+
+@interface DarwinNotificationCenter: NSObject
+
++ (instancetype)sharedInstance;
+- (void)postNotificationWithName:(NSNotificationName)name;
+
+@end
+
+NS_ASSUME_NONNULL_END

ios/app/JitsiMeetBroadcast Extension/DarwinNotificationCenter.m

@@ -0,0 +1,50 @@
+/*
+ * Copyright @ 2021-present 8x8, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import "DarwinNotificationCenter.h"
+
+NSNotificationName const kBroadcastStartedNotification = @"iOS_BroadcastStarted";
+NSNotificationName const kBroadcastStoppedNotification = @"iOS_BroadcastStopped";
+
+@implementation DarwinNotificationCenter {
+  CFNotificationCenterRef _notificationCenter;
+}
+
++ (instancetype)sharedInstance {
+  static DarwinNotificationCenter *sharedInstance = nil;
+  static dispatch_once_t onceToken;
+  dispatch_once(&onceToken, ^{
+      sharedInstance = [[self alloc] init];
+  });
+  
+  return sharedInstance;
+}
+
+- (instancetype)init {
+  self = [super init];
+  if (self) {
+    _notificationCenter = CFNotificationCenterGetDarwinNotifyCenter();
+  }
+  
+  return self;
+}
+
+- (void)postNotificationWithName:(NSString*)name {
+  CFNotificationCenterPostNotification(_notificationCenter, (__bridge CFStringRef)name, NULL, NULL, true);
+}
+
+@end
+

ios/app/JitsiMeetBroadcast Extension/Info.plist

@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleDisplayName</key>
+	<string>JitsiMeetBroadcast Extension</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>NSExtension</key>
+	<dict>
+		<key>NSExtensionPointIdentifier</key>
+		<string>com.apple.broadcast-services-upload</string>
+		<key>NSExtensionPrincipalClass</key>
+		<string>SampleHandler</string>
+		<key>RPBroadcastProcessMode</key>
+		<string>RPBroadcastProcessModeSampleBuffer</string>
+	</dict>
+</dict>
+</plist>

ios/app/JitsiMeetBroadcast Extension/JitsiMeetBroadcast Extension.entitlements

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>com.apple.security.application-groups</key>
+	<array>
+		<string>group.org.jitsi.meet.appgroup</string>
+	</array>
+</dict>
+</plist>

ios/app/JitsiMeetBroadcast Extension/SampleHandler.h

@@ -0,0 +1,21 @@
+/*
+ * Copyright @ 2021-present 8x8, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import <ReplayKit/ReplayKit.h>
+
+@interface SampleHandler : RPBroadcastSampleHandler
+
+@end

ios/app/JitsiMeetBroadcast Extension/SampleHandler.m

@@ -0,0 +1,123 @@
+/*
+ * Copyright @ 2021-present 8x8, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import "SampleHandler.h"
+#import "SocketConnection.h"
+#import "SampleUploader.h"
+#import "DarwinNotificationCenter.h"
+
+@interface SampleHandler ()
+
+@property (nonatomic, retain) SocketConnection *clientConnection;
+@property (nonatomic, retain) SampleUploader *uploader;
+
+@end
+
+@implementation SampleHandler
+
+- (instancetype)init {
+  self = [super init];
+  if (self) {
+    self.clientConnection = [[SocketConnection alloc] initWithFilePath:self.socketFilePath];
+    [self setupConnection];
+    
+    self.uploader = [[SampleUploader alloc] initWithConnection:self.clientConnection];    
+  }
+  
+  return self;
+}
+
+- (void)broadcastStartedWithSetupInfo:(NSDictionary<NSString *,NSObject *> *)setupInfo {
+  // User has requested to start the broadcast. Setup info from the UI extension can be supplied but optional.
+  NSLog(@"broadcast started");
+  
+  [[DarwinNotificationCenter sharedInstance] postNotificationWithName:kBroadcastStartedNotification];
+  [self openConnection];
+}
+
+- (void)broadcastPaused {
+    // User has requested to pause the broadcast. Samples will stop being delivered.
+}
+
+- (void)broadcastResumed {
+    // User has requested to resume the broadcast. Samples delivery will resume.
+}
+
+- (void)broadcastFinished {
+    // User has requested to finish the broadcast.
+  [[DarwinNotificationCenter sharedInstance] postNotificationWithName:kBroadcastStoppedNotification];
+  [self.clientConnection close];
+}
+
+- (void)processSampleBuffer:(CMSampleBufferRef)sampleBuffer withType:(RPSampleBufferType)sampleBufferType {
+  static NSUInteger frameCount = 0;
+  switch (sampleBufferType) {
+    case RPSampleBufferTypeVideo:
+      // adjust frame rate by using every third frame
+      if (++frameCount%3 == 0 && self.uploader.isReady) {
+        [self.uploader sendSample:sampleBuffer];
+      }
+      break;
+
+    default:
+      break;
+  }
+}
+
+// MARK: Private Methods
+
+- (NSString *)socketFilePath {
+    // the appGroupIdentifier must match the value provided in the app's info.plist for the RTCAppGroupIdentifier key
+    NSString *appGroupIdentifier = @"group.org.jitsi.meet.appgroup";
+    NSURL *sharedContainer = [[NSFileManager defaultManager] containerURLForSecurityApplicationGroupIdentifier:appGroupIdentifier];
+    NSString *socketFilePath = [[sharedContainer URLByAppendingPathComponent:@"rtc_SSFD"] path];
+      
+    return socketFilePath;
+}
+
+- (void)setupConnection {
+  __weak __typeof(self) weakSelf = self;
+  self.clientConnection.didClose = ^(NSError *error) {
+    NSLog(@"client connection did close: %@", error);
+    if (error) {
+      [weakSelf finishBroadcastWithError:error];
+    }
+    else {
+      NSInteger JMScreenSharingStopped = 10001;
+      NSError *customError = [NSError errorWithDomain:RPRecordingErrorDomain
+                                                 code:JMScreenSharingStopped
+                                             userInfo:@{NSLocalizedDescriptionKey: @"Screen sharing stopped"}];
+      [weakSelf finishBroadcastWithError:customError];
+    }
+  };
+}
+
+- (void)openConnection {
+  dispatch_queue_t queue = dispatch_queue_create("org.jitsi.meet.broadcast.connectTimer", 0);
+  dispatch_source_t timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, queue);
+  dispatch_source_set_timer(timer, dispatch_walltime(NULL, 0), 0.1 * NSEC_PER_SEC, 0.1 * NSEC_PER_SEC);
+  
+  dispatch_source_set_event_handler(timer, ^{
+    BOOL success = [self.clientConnection open];
+    if (success) {
+      dispatch_source_cancel(timer);
+    }
+  });
+
+  dispatch_resume(timer);
+}
+
+@end

ios/app/JitsiMeetBroadcast Extension/SampleUploader.h

@@ -0,0 +1,33 @@
+/*
+ * Copyright @ 2021-present 8x8, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import <Foundation/Foundation.h>
+#import <ReplayKit/ReplayKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@class SocketConnection;
+
+@interface SampleUploader : NSObject
+
+@property (nonatomic, assign, readonly) BOOL isReady;
+
+- (instancetype)initWithConnection:(SocketConnection *)connection;
+- (void)sendSample:(CMSampleBufferRef)sampleBuffer;
+
+@end
+
+NS_ASSUME_NONNULL_END

ios/app/JitsiMeetBroadcast Extension/SampleUploader.m

@@ -0,0 +1,155 @@
+/*
+ * Copyright @ 2021-present 8x8, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import <MessageUI/MessageUI.h>
+#import <ReplayKit/ReplayKit.h>
+
+#import "SampleUploader.h"
+#import "SocketConnection.h"
+
+static const NSInteger kBufferMaxLenght = 10 * 1024;
+
+@interface SampleUploader ()
+
+@property (nonatomic, assign) BOOL isReady;
+
+@property (nonatomic, strong) dispatch_queue_t serialQueue;
+@property (nonatomic, strong) SocketConnection *connection;
+@property (nonatomic, strong) CIContext *imageContext;
+
+@property (nonatomic, strong) NSData *dataToSend;
+@property (nonatomic, assign) NSUInteger byteIndex;
+
+@end
+
+@implementation SampleUploader
+
+- (instancetype)initWithConnection:(SocketConnection *)connection {
+  self = [super init];
+  if (self) {
+    self.serialQueue = dispatch_queue_create("org.jitsi.meet.broadcast.sampleUploader", DISPATCH_QUEUE_SERIAL);
+    
+    self.connection = connection;
+    [self setupConnection];
+    
+    self.imageContext = [[CIContext alloc] initWithOptions:nil];
+    self.isReady = false;
+  }
+  
+  return self;
+}
+
+- (void)sendSample:(CMSampleBufferRef)sampleBuffer {
+  self.isReady = false;
+  
+  self.dataToSend = [self prepareSample:sampleBuffer];
+  self.byteIndex = 0;
+  
+  dispatch_async(self.serialQueue, ^{
+    [self sendData];
+  });
+}
+
+// MARK: Private Methods
+
+- (void)setupConnection {
+  __weak __typeof(self) weakSelf = self;
+  self.connection.didOpen = ^{
+    weakSelf.isReady = true;
+  };
+  self.connection.streamHasSpaceAvailable = ^{
+    dispatch_async(weakSelf.serialQueue, ^{
+      weakSelf.isReady = ![weakSelf sendData];
+    });
+  };
+}
+
+/**
+ This function downscales and converts to jpeg the provided sample buffer, then wraps the resulted image data into a CFHTTPMessageRef. Returns the serialized CFHTTPMessageRef.
+ */
+- (NSData *)prepareSample:(CMSampleBufferRef)sampleBuffer {
+  CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
+    
+  CVPixelBufferLockBaseAddress(imageBuffer, kCVPixelBufferLock_ReadOnly);
+  
+  CGFloat scaleFactor = 2;
+  size_t width = CVPixelBufferGetWidth(imageBuffer)/scaleFactor;
+  size_t height = CVPixelBufferGetHeight(imageBuffer)/scaleFactor;
+    
+  CGAffineTransform scaleTransform = CGAffineTransformMakeScale(1/scaleFactor, 1/scaleFactor);
+  NSData *bufferData = [self jpegDataFromPixelBuffer:imageBuffer withScaling:scaleTransform];
+  
+  CVPixelBufferUnlockBaseAddress(imageBuffer, kCVPixelBufferLock_ReadOnly);
+  
+  if (bufferData) {
+    CFHTTPMessageRef httpResponse = CFHTTPMessageCreateResponse(kCFAllocatorDefault, 200, NULL, kCFHTTPVersion1_1);
+    CFHTTPMessageSetHeaderFieldValue(httpResponse, (__bridge CFStringRef)@"Content-Length", (__bridge CFStringRef)[NSString stringWithFormat:@"%ld", bufferData.length]);
+    CFHTTPMessageSetHeaderFieldValue(httpResponse, (__bridge CFStringRef)@"Buffer-Width", (__bridge CFStringRef)[NSString stringWithFormat:@"%ld", width]);
+    CFHTTPMessageSetHeaderFieldValue(httpResponse, (__bridge CFStringRef)@"Buffer-Height", (__bridge CFStringRef)[NSString stringWithFormat:@"%ld", height]);
+
+    CFHTTPMessageSetBody(httpResponse, (__bridge CFDataRef)bufferData);
+
+    CFDataRef serializedMessage = CFHTTPMessageCopySerializedMessage(httpResponse);
+    CFRelease(httpResponse);
+    
+    return CFBridgingRelease(serializedMessage);
+  }
+  
+  return nil;
+}
+
+- (BOOL)sendData {
+  if (!self.dataToSend) {
+    NSLog(@"no data to send");
+    return false;
+  }
+
+  NSUInteger bytesLeft = self.dataToSend.length - self.byteIndex;
+  
+  NSInteger length = bytesLeft > kBufferMaxLenght ? kBufferMaxLenght : bytesLeft;
+  uint8_t buffer[length];
+  [self.dataToSend getBytes:&buffer range:NSMakeRange(self.byteIndex, length)];
+
+  length = [self.connection writeBufferToStream:buffer maxLength:length];
+  if (length > 0) {
+    self.byteIndex += length;
+    bytesLeft -= length;
+
+    if (bytesLeft == 0) {
+      NSLog(@"video sample processed successfully");
+      self.dataToSend = nil;
+      self.byteIndex = 0;
+    }
+  }
+  else {
+    NSLog(@"writeBufferToStream failure");
+  }
+  
+  return true;
+}
+
+- (NSData *)jpegDataFromPixelBuffer:(CVPixelBufferRef)pixelBuffer withScaling:(CGAffineTransform)scaleTransform {
+  CIImage *image = [[CIImage alloc] initWithCVPixelBuffer:pixelBuffer];
+  image = [image imageByApplyingTransform:scaleTransform];
+  
+  NSDictionary *options = @{(NSString *)kCGImageDestinationLossyCompressionQuality: [NSNumber numberWithFloat:1.0]};
+  NSData *imageData = [self.imageContext JPEGRepresentationOfImage:image
+                                                        colorSpace:image.colorSpace
+                                                           options:options];
+  return imageData;
+}
+
+@end

ios/app/JitsiMeetBroadcast Extension/SocketConnection.h

@@ -0,0 +1,34 @@
+/*
+ * Copyright @ 2021-present 8x8, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface SocketConnection : NSObject
+
+@property (nonatomic, copy, nullable) void (^didOpen)(void);
+@property (nonatomic, copy, nullable) void (^didClose)(NSError*);
+@property (nonatomic, copy, nullable) void (^streamHasSpaceAvailable)(void);
+
+- (instancetype)initWithFilePath:(nonnull NSString *)filePath;
+- (BOOL)open;
+- (void)close;
+- (NSInteger)writeBufferToStream:(const uint8_t*)buffer maxLength:(NSInteger)length;
+
+@end
+
+NS_ASSUME_NONNULL_END

ios/app/JitsiMeetBroadcast Extension/SocketConnection.m

@@ -0,0 +1,189 @@
+/*
+ * Copyright @ 2021-present 8x8, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <sys/socket.h>
+#include <sys/un.h>
+
+#import "SocketConnection.h"
+
+@interface SocketConnection () <NSStreamDelegate>
+
+@property (nonatomic, copy) NSString *filePath;
+
+@property (nonatomic, strong) NSInputStream *inputStream;
+@property (nonatomic, strong) NSOutputStream *outputStream;
+
+@property (nonatomic, strong) NSThread *networkThread;
+
+@end
+
+@implementation SocketConnection {
+  int _socket;
+  struct sockaddr_un _socketAddr;
+}
+
+- (instancetype)initWithFilePath:(NSString *)path {
+  self = [super init];
+  if (self) {
+    self.filePath = path;
+    
+    [self setupSocketWithFilePath:path];
+    [self setupNetworkThread];
+  }
+  
+  return self;
+}
+
+- (BOOL)open {
+  NSLog(@"Open socket connection");
+  
+  if (![[NSFileManager defaultManager] fileExistsAtPath:self.filePath]) {
+      NSLog(@"failure: socket file missing");
+      return false;
+  }
+
+  int status = connect(_socket, (struct sockaddr *)&_socketAddr, sizeof(_socketAddr));
+  if (status < 0) {
+      NSLog(@"failure: socket connect (%d)", status);
+      return false;
+  }
+  
+  [self.networkThread start];
+
+  CFReadStreamRef readStream;
+  CFWriteStreamRef writeStream;
+
+  CFStreamCreatePairWithSocket(kCFAllocatorDefault, _socket, &readStream, &writeStream);
+
+  self.inputStream = (__bridge_transfer NSInputStream *)readStream;
+  self.inputStream.delegate = self;
+  [self.inputStream setProperty:@"kCFBooleanTrue" forKey:@"kCFStreamPropertyShouldCloseNativeSocket"];
+
+  self.outputStream = (__bridge_transfer NSOutputStream *)writeStream;
+  self.outputStream.delegate = self;
+  [self.outputStream setProperty:@"kCFBooleanTrue" forKey:@"kCFStreamPropertyShouldCloseNativeSocket"];
+  
+  [self performSelector:@selector(scheduleStreams) onThread:self.networkThread withObject:nil waitUntilDone:true];
+
+  [self.inputStream open];
+  [self.outputStream open];
+
+  NSLog(@"read stream status: %ld", CFReadStreamGetStatus(readStream));
+  NSLog(@"write stream status: %ld", CFWriteStreamGetStatus(writeStream));
+  
+  return true;
+}
+
+- (void)close {
+  [self performSelector:@selector(unscheduleStreams) onThread:self.networkThread withObject:nil waitUntilDone:true];
+
+  self.inputStream.delegate = nil;
+  self.outputStream.delegate = nil;
+  
+  [self.inputStream close];
+  [self.outputStream close];
+
+  [self.networkThread cancel];
+}
+
+- (NSInteger)writeBufferToStream:(const uint8_t*)buffer maxLength:(NSInteger)length {
+  return [self.outputStream write:buffer maxLength:length];
+}
+
+// MARK: Private Methods
+
+- (BOOL)isOpen {
+  return self.inputStream.streamStatus == NSStreamStatusOpen && self.outputStream.streamStatus == NSStreamStatusOpen;
+}
+
+- (void)setupSocketWithFilePath:(NSString*)path {
+  _socket = socket(AF_UNIX, SOCK_STREAM, 0);
+  
+  memset(&_socketAddr, 0, sizeof(_socketAddr));
+  _socketAddr.sun_family = AF_UNIX;
+  strncpy(_socketAddr.sun_path, path.UTF8String, sizeof(_socketAddr.sun_path) - 1);
+}
+
+- (void)setupNetworkThread {
+  self.networkThread = [[NSThread alloc] initWithBlock:^{
+    do {
+      @autoreleasepool {
+        [[NSRunLoop currentRunLoop] run];
+      }
+    } while (![NSThread currentThread].isCancelled);
+  }];
+  self.networkThread.qualityOfService = NSQualityOfServiceUserInitiated;
+}
+
+- (void)scheduleStreams {
+  [self.inputStream scheduleInRunLoop:NSRunLoop.currentRunLoop forMode:NSRunLoopCommonModes];
+  [self.outputStream scheduleInRunLoop:NSRunLoop.currentRunLoop forMode:NSRunLoopCommonModes];
+}
+
+- (void)unscheduleStreams {
+  [self.inputStream removeFromRunLoop:NSRunLoop.currentRunLoop forMode:NSRunLoopCommonModes];
+  [self.outputStream removeFromRunLoop:NSRunLoop.currentRunLoop forMode:NSRunLoopCommonModes];
+}
+
+- (void)notifyDidClose:(NSError *)error {
+  if (self.didClose) {
+    self.didClose(error);
+  }
+}
+
+@end
+
+#pragma mark - NSStreamDelegate
+
+@implementation SocketConnection (NSStreamDelegate)
+
+- (void)stream:(NSStream *)aStream handleEvent:(NSStreamEvent)eventCode {
+  switch (eventCode) {
+    case NSStreamEventOpenCompleted:
+      NSLog(@"client stream open completed");
+      if (aStream == self.outputStream && self.didOpen) {
+        self.didOpen();
+      }
+      break;
+    case NSStreamEventHasBytesAvailable:
+      if (aStream == self.inputStream) {
+        uint8_t buffer;
+        NSInteger numberOfBytesRead = [(NSInputStream *)aStream read:&buffer maxLength:sizeof(buffer)];
+        if (!numberOfBytesRead && aStream.streamStatus == NSStreamStatusAtEnd) {
+          NSLog(@"server socket closed");
+          [self close];
+          [self notifyDidClose:nil];
+        }
+      }
+      break;
+    case NSStreamEventHasSpaceAvailable:
+      if (aStream == self.outputStream && self.streamHasSpaceAvailable) {
+        NSLog(@"client stream has space available");
+        self.streamHasSpaceAvailable();
+      }
+      break;
+    case NSStreamEventErrorOccurred:
+      NSLog(@"client stream error occurred: %@", aStream.streamError);
+      [self close];
+      [self notifyDidClose:aStream.streamError];
+      break;
+      
+    default:
+      break;
+  }
+}
+
+@end

ios/app/app.entitlements

@@ -8,6 +8,10 @@
 		<string>applinks:beta.meet.jit.si</string>
 		<string>applinks:meet.jit.si</string>
 	</array>
+	<key>com.apple.security.application-groups</key>
+	<array>
+		<string>group.org.jitsi.meet.appgroup</string>
+	</array>
 	<key>com.apple.developer.siri</key>
 	<true/>
 </dict>

ios/app/app.xcodeproj/project.pbxproj

@@ -23,6 +23,12 @@
 		13B07FBD1A68108700A75B9A /* LaunchScreen.xib in Resources */ = {isa = PBXBuildFile; fileRef = 13B07FB11A68108700A75B9A /* LaunchScreen.xib */; };
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 		13B07FC11A68108700A75B9A /* main.m in Sources */ = {isa = PBXBuildFile; fileRef = 13B07FB71A68108700A75B9A /* main.m */; };
+		4E51B75E25E4115F0038575A /* DarwinNotificationCenter.m in Sources */ = {isa = PBXBuildFile; fileRef = 4E51B75D25E4115F0038575A /* DarwinNotificationCenter.m */; };
+		4EC49BB725BEDAC100E76218 /* ReplayKit.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 4EC49B8625BED71300E76218 /* ReplayKit.framework */; };
+		4EC49BBB25BEDAC100E76218 /* SampleHandler.m in Sources */ = {isa = PBXBuildFile; fileRef = 4EC49BBA25BEDAC100E76218 /* SampleHandler.m */; };
+		4EC49BBF25BEDAC100E76218 /* JitsiMeetBroadcast Extension.appex in Embed App Extensions */ = {isa = PBXBuildFile; fileRef = 4EC49BB625BEDAC100E76218 /* JitsiMeetBroadcast Extension.appex */; settings = {ATTRIBUTES = (RemoveHeadersOnCopy, ); }; };
+		4EC49BCB25BEDB6400E76218 /* SocketConnection.m in Sources */ = {isa = PBXBuildFile; fileRef = 4EC49BCA25BEDB6400E76218 /* SocketConnection.m */; };
+		4EC49BD125BF19CF00E76218 /* SampleUploader.m in Sources */ = {isa = PBXBuildFile; fileRef = 4EC49BD025BF19CF00E76218 /* SampleUploader.m */; };
 		55BEDABDA92D47D399A70A5E /* libPods-JitsiMeet.a in Frameworks */ = {isa = PBXBuildFile; fileRef = D878B07B3FBD6E305EAA6B27 /* libPods-JitsiMeet.a */; };
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@@ -48,6 +54,13 @@
 			remoteGlobalIDString = 0BEA5C241F7B8F73000D0AB4;
 			remoteInfo = JitsiMeetCompanion;
 		};
+		4EC49BBD25BEDAC100E76218 /* PBXContainerItemProxy */ = {
+			isa = PBXContainerItemProxy;
+			containerPortal = 83CBB9F71A601CBA00E9B192 /* Project object */;
+			proxyType = 1;
+			remoteGlobalIDString = 4EC49BB525BEDAC100E76218;
+			remoteInfo = "JitsiMeetBroadcast Extension";
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 /* End PBXContainerItemProxy section */
 
 /* Begin PBXCopyFilesBuildPhase section */
@@ -85,6 +98,17 @@
 			name = "Embed Watch Content";
 			runOnlyForDeploymentPostprocessing = 0;
 		};
+		4EC49B9025BED71300E76218 /* Embed App Extensions */ = {
+			isa = PBXCopyFilesBuildPhase;
+			buildActionMask = 2147483647;
+			dstPath = "";
+			dstSubfolderSpec = 13;
+			files = (
+				4EC49BBF25BEDAC100E76218 /* JitsiMeetBroadcast Extension.appex in Embed App Extensions */,
+			);
+			name = "Embed App Extensions";
+			runOnlyForDeploymentPostprocessing = 0;
+		};
 /* End PBXCopyFilesBuildPhase section */
 
 /* Begin PBXFileReference section */
@@ -115,6 +139,18 @@
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+		4E51B75C25E4115F0038575A /* DarwinNotificationCenter.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = DarwinNotificationCenter.h; sourceTree = "<group>"; };
+		4E51B75D25E4115F0038575A /* DarwinNotificationCenter.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = DarwinNotificationCenter.m; sourceTree = "<group>"; };
+		4EC49B8625BED71300E76218 /* ReplayKit.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = ReplayKit.framework; path = System/Library/Frameworks/ReplayKit.framework; sourceTree = SDKROOT; };
+		4EC49BB625BEDAC100E76218 /* JitsiMeetBroadcast Extension.appex */ = {isa = PBXFileReference; explicitFileType = "wrapper.app-extension"; includeInIndex = 0; path = "JitsiMeetBroadcast Extension.appex"; sourceTree = BUILT_PRODUCTS_DIR; };
+		4EC49BB925BEDAC100E76218 /* SampleHandler.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = SampleHandler.h; sourceTree = "<group>"; };
+		4EC49BBA25BEDAC100E76218 /* SampleHandler.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = SampleHandler.m; sourceTree = "<group>"; };
+		4EC49BBC25BEDAC100E76218 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
+		4EC49BC925BEDB6400E76218 /* SocketConnection.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = SocketConnection.h; sourceTree = "<group>"; };
+		4EC49BCA25BEDB6400E76218 /* SocketConnection.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = SocketConnection.m; sourceTree = "<group>"; };
+		4EC49BCF25BF19CF00E76218 /* SampleUploader.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = SampleUploader.h; sourceTree = "<group>"; };
+		4EC49BD025BF19CF00E76218 /* SampleUploader.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = SampleUploader.m; sourceTree = "<group>"; };
+		4EC49BDB25BF280A00E76218 /* JitsiMeetBroadcast Extension.entitlements */ = {isa = PBXFileReference; lastKnownFileType = text.plist.entitlements; path = "JitsiMeetBroadcast Extension.entitlements"; sourceTree = "<group>"; };
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@@ -153,6 +189,14 @@
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 		};
+		4EC49BB325BEDAC100E76218 /* Frameworks */ = {
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+			buildActionMask = 2147483647;
+			files = (
+				4EC49BB725BEDAC100E76218 /* ReplayKit.framework in Frameworks */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
 /* End PBXFrameworksBuildPhase section */
 
 /* Begin PBXGroup section */
@@ -165,6 +209,7 @@
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 				0BD6B4361EF82A6B00D1F4CD /* WebRTC.framework */,
 				D878B07B3FBD6E305EAA6B27 /* libPods-JitsiMeet.a */,
+				4EC49B8625BED71300E76218 /* ReplayKit.framework */,
 			);
 			name = Frameworks;
 			sourceTree = "<group>";
@@ -216,6 +261,23 @@
 			path = src;
 			sourceTree = "<group>";
 		};
+		4EC49BB825BEDAC100E76218 /* JitsiMeetBroadcast Extension */ = {
+			isa = PBXGroup;
+			children = (
+				4EC49BDB25BF280A00E76218 /* JitsiMeetBroadcast Extension.entitlements */,
+				4EC49BB925BEDAC100E76218 /* SampleHandler.h */,
+				4EC49BBA25BEDAC100E76218 /* SampleHandler.m */,
+				4EC49BC925BEDB6400E76218 /* SocketConnection.h */,
+				4EC49BCA25BEDB6400E76218 /* SocketConnection.m */,
+				4EC49BCF25BF19CF00E76218 /* SampleUploader.h */,
+				4EC49BD025BF19CF00E76218 /* SampleUploader.m */,
+				4EC49BBC25BEDAC100E76218 /* Info.plist */,
+				4E51B75C25E4115F0038575A /* DarwinNotificationCenter.h */,
+				4E51B75D25E4115F0038575A /* DarwinNotificationCenter.m */,
+			);
+			path = "JitsiMeetBroadcast Extension";
+			sourceTree = "<group>";
+		};
 		5E96ADD5E49F3B3822EF9A52 /* Pods */ = {
 			isa = PBXGroup;
 			children = (
@@ -236,6 +298,7 @@
 				13B07FAE1A68108700A75B9A /* src */,
 				5E96ADD5E49F3B3822EF9A52 /* Pods */,
 				0BEA5C261F7B8F73000D0AB4 /* Watch app */,
+				4EC49BB825BEDAC100E76218 /* JitsiMeetBroadcast Extension */,
 				0BEA5C351F7B8F73000D0AB4 /* WatchKit extension */,
 			);
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@@ -248,6 +311,7 @@
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 				0BEA5C311F7B8F73000D0AB4 /* JitsiMeetCompanion Extension.appex */,
+				4EC49BB625BEDAC100E76218 /* JitsiMeetBroadcast Extension.appex */,
 			);
 			name = Products;
 			sourceTree = "<group>";
@@ -305,17 +369,36 @@
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 				DE4F6D6E22005C0400DE699E /* Setup Dropbox */,
 				0BEA5C491F7B8F73000D0AB4 /* Embed Watch Content */,
+				4EC49B9025BED71300E76218 /* Embed App Extensions */,
 			);
 			buildRules = (
 			);
 			dependencies = (
 				0BEA5C401F7B8F73000D0AB4 /* PBXTargetDependency */,
+				4EC49BBE25BEDAC100E76218 /* PBXTargetDependency */,
 			);
 			name = JitsiMeet;
 			productName = "Jitsi Meet";
 			productReference = 13B07F961A680F5B00A75B9A /* jitsi-meet.app */;
 			productType = "com.apple.product-type.application";
 		};
+		4EC49BB525BEDAC100E76218 /* JitsiMeetBroadcast Extension */ = {
+			isa = PBXNativeTarget;
+			buildConfigurationList = 4EC49BC025BEDAC100E76218 /* Build configuration list for PBXNativeTarget "JitsiMeetBroadcast Extension" */;
+			buildPhases = (
+				4EC49BB225BEDAC100E76218 /* Sources */,
+				4EC49BB325BEDAC100E76218 /* Frameworks */,
+				4EC49BB425BEDAC100E76218 /* Resources */,
+			);
+			buildRules = (
+			);
+			dependencies = (
+			);
+			name = "JitsiMeetBroadcast Extension";
+			productName = "JitsiMeetBroadcast Extension";
+			productReference = 4EC49BB625BEDAC100E76218 /* JitsiMeetBroadcast Extension.appex */;
+			productType = "com.apple.product-type.app-extension";
+		};
 /* End PBXNativeTarget section */
 
 /* Begin PBXProject section */
@@ -347,6 +430,9 @@
 							};
 						};
 					};
+					4EC49BB525BEDAC100E76218 = {
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+					};
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 			buildConfigurationList = 83CBB9FA1A601CBA00E9B192 /* Build configuration list for PBXProject "app" */;
@@ -365,6 +451,7 @@
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 				0BEA5C241F7B8F73000D0AB4 /* JitsiMeetCompanion */,
 				0BEA5C301F7B8F73000D0AB4 /* JitsiMeetCompanion Extension */,
+				4EC49BB525BEDAC100E76218 /* JitsiMeetBroadcast Extension */,
 			);
 		};
 /* End PBXProject section */
@@ -397,6 +484,13 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
+		4EC49BB425BEDAC100E76218 /* Resources */ = {
+			isa = PBXResourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
 /* End PBXResourcesBuildPhase section */
 
 /* Begin PBXShellScriptBuildPhase section */
@@ -532,6 +626,17 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
+		4EC49BB225BEDAC100E76218 /* Sources */ = {
+			isa = PBXSourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				4EC49BCB25BEDB6400E76218 /* SocketConnection.m in Sources */,
+				4EC49BBB25BEDAC100E76218 /* SampleHandler.m in Sources */,
+				4E51B75E25E4115F0038575A /* DarwinNotificationCenter.m in Sources */,
+				4EC49BD125BF19CF00E76218 /* SampleUploader.m in Sources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
 /* End PBXSourcesBuildPhase section */
 
 /* Begin PBXTargetDependency section */
@@ -545,6 +650,11 @@
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 			targetProxy = 0BEA5C3F1F7B8F73000D0AB4 /* PBXContainerItemProxy */;
 		};
+		4EC49BBE25BEDAC100E76218 /* PBXTargetDependency */ = {
+			isa = PBXTargetDependency;
+			target = 4EC49BB525BEDAC100E76218 /* JitsiMeetBroadcast Extension */;
+			targetProxy = 4EC49BBD25BEDAC100E76218 /* PBXContainerItemProxy */;
+		};
 /* End PBXTargetDependency section */
 
 /* Begin PBXVariantGroup section */
@@ -770,6 +880,70 @@
 			};
 			name = Release;
 		};
+		4EC49BC125BEDAC100E76218 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				CLANG_ANALYZER_NONNULL = YES;
+				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++14";
+				CLANG_ENABLE_OBJC_WEAK = YES;
+				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
+				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
+				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
+				CODE_SIGN_ENTITLEMENTS = "JitsiMeetBroadcast Extension/JitsiMeetBroadcast Extension.entitlements";
+				CODE_SIGN_IDENTITY = "iPhone Developer";
+				CODE_SIGN_STYLE = Automatic;
+				DEBUG_INFORMATION_FORMAT = dwarf;
+				DEVELOPMENT_TEAM = FC967L3QRG;
+				GCC_C_LANGUAGE_STANDARD = gnu11;
+				INFOPLIST_FILE = "JitsiMeetBroadcast Extension/Info.plist";
+				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+					"@executable_path/../../Frameworks",
+				);
+				MTL_ENABLE_DEBUG_INFO = INCLUDE_SOURCE;
+				MTL_FAST_MATH = YES;
+				PRODUCT_BUNDLE_IDENTIFIER = org.jitsi.meet.broadcast.extension;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SKIP_INSTALL = YES;
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = Debug;
+		};
+		4EC49BC225BEDAC100E76218 /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				CLANG_ANALYZER_NONNULL = YES;
+				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++14";
+				CLANG_ENABLE_OBJC_WEAK = YES;
+				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
+				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
+				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
+				CODE_SIGN_ENTITLEMENTS = "JitsiMeetBroadcast Extension/JitsiMeetBroadcast Extension.entitlements";
+				CODE_SIGN_IDENTITY = "iPhone Developer";
+				CODE_SIGN_STYLE = Automatic;
+				COPY_PHASE_STRIP = NO;
+				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
+				DEVELOPMENT_TEAM = FC967L3QRG;
+				GCC_C_LANGUAGE_STANDARD = gnu11;
+				INFOPLIST_FILE = "JitsiMeetBroadcast Extension/Info.plist";
+				IPHONEOS_DEPLOYMENT_TARGET = 11.0;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+					"@executable_path/../../Frameworks",
+				);
+				MTL_FAST_MATH = YES;
+				PRODUCT_BUNDLE_IDENTIFIER = org.jitsi.meet.broadcast.extension;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SKIP_INSTALL = YES;
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = Release;
+		};
 		83CBBA201A601CBA00E9B192 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
@@ -914,6 +1088,15 @@
 			defaultConfigurationIsVisible = 0;
 			defaultConfigurationName = Release;
 		};
+		4EC49BC025BEDAC100E76218 /* Build configuration list for PBXNativeTarget "JitsiMeetBroadcast Extension" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				4EC49BC125BEDAC100E76218 /* Debug */,
+				4EC49BC225BEDAC100E76218 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
 		83CBB9FA1A601CBA00E9B192 /* Build configuration list for PBXProject "app" */ = {
 			isa = XCConfigurationList;
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ios/app/src/Info.plist

@@ -45,6 +45,8 @@
 	</array>
 	<key>CFBundleVersion</key>
 	<string>1</string>
+	<key>FirebaseCrashlyticsCollectionEnabled</key>
+	<string>false</string>
 	<key>FirebaseScreenReportingEnabled</key>
 	<false/>
 	<key>ITSAppUsesNonExemptEncryption</key>
@@ -66,14 +68,18 @@
 	<string>See your scheduled meetings in the app.</string>
 	<key>NSCameraUsageDescription</key>
 	<string>Participate in meetings with video.</string>
-	<key>NSMicrophoneUsageDescription</key>
-	<string>Participate in meetings with voice.</string>
 	<key>NSLocalNetworkUsageDescription</key>
 	<string>Local network is used for establishing Peer-to-Peer connections.</string>
+	<key>NSMicrophoneUsageDescription</key>
+	<string>Participate in meetings with voice.</string>
 	<key>NSUserActivityTypes</key>
 	<array>
 		<string>org.jitsi.JitsiMeet.ios.conference</string>
 	</array>
+	<key>RTCAppGroupIdentifier</key>
+	<string>group.org.jitsi.meet.appgroup</string>
+	<key>RTCScreenSharingExtension</key>
+	<string>org.jitsi.meet.broadcast.extension</string>
 	<key>UIBackgroundModes</key>
 	<array>
 		<string>audio</string>
@@ -99,7 +105,5 @@
 	</array>
 	<key>UIViewControllerBasedStatusBarAppearance</key>
 	<false/>
-	<key>FirebaseCrashlyticsCollectionEnabled</key>
-	<string>false</string>
 </dict>
 </plist>

ios/sdk/sdk.xcodeproj/project.pbxproj

@@ -24,6 +24,8 @@
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+		4E51B76425E5345E0038575A /* ScheenshareEventEmiter.h in Headers */ = {isa = PBXBuildFile; fileRef = 4E51B76225E5345E0038575A /* ScheenshareEventEmiter.h */; };
+		4E51B76525E5345E0038575A /* ScheenshareEventEmiter.m in Sources */ = {isa = PBXBuildFile; fileRef = 4E51B76325E5345E0038575A /* ScheenshareEventEmiter.m */; };
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@@ -85,6 +87,8 @@
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 		0BD906E91EC0C00300C8C18E /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
+		4E51B76225E5345E0038575A /* ScheenshareEventEmiter.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = ScheenshareEventEmiter.h; sourceTree = "<group>"; };
+		4E51B76325E5345E0038575A /* ScheenshareEventEmiter.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = ScheenshareEventEmiter.m; sourceTree = "<group>"; };
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@@ -231,6 +235,8 @@
 				C8AFD27D2462C613000293D2 /* InfoPlistUtil.h */,
 				C8AFD27E2462C613000293D2 /* InfoPlistUtil.m */,
 				C81E9AB825AC5AD800B134D9 /* ExternalAPI.h */,
+				4E51B76225E5345E0038575A /* ScheenshareEventEmiter.h */,
+				4E51B76325E5345E0038575A /* ScheenshareEventEmiter.m */,
 			);
 			path = src;
 			sourceTree = "<group>";
@@ -298,6 +304,7 @@
 				0B93EF7E1EC9DDCD0030D24D /* RCTBridgeWrapper.h in Headers */,
 				DE81A2DE2317ED5400AE1940 /* JitsiMeetBaseLogHandler.h in Headers */,
 				DEA9F284258A5D9900D4CD74 /* JitsiMeetSDK.h in Headers */,
+				4E51B76425E5345E0038575A /* ScheenshareEventEmiter.h in Headers */,
 				DE65AACC2318028300290BEC /* JitsiMeetBaseLogHandler+Private.h in Headers */,
 				0B412F221EDEF6EA00B1A0A6 /* JitsiMeetViewDelegate.h in Headers */,
 				0BD906EA1EC0C00300C8C18E /* JitsiMeet.h in Headers */,
@@ -466,6 +473,7 @@
 				C69EFA0C209A0F660027712B /* JMCallKitEmitter.swift in Sources */,
 				DEFE535621FB2E8300011A3A /* ReactUtils.m in Sources */,
 				C6A34261204EF76800E062DD /* DragGestureController.swift in Sources */,
+				4E51B76525E5345E0038575A /* ScheenshareEventEmiter.m in Sources */,
 				A4A934E9212F3ADB001E9388 /* Dropbox.m in Sources */,
 				C69EFA0D209A0F660027712B /* JMCallKitProxy.swift in Sources */,
 				DE81A2D52316AC4D00AE1940 /* JitsiMeetLogger.m in Sources */,

ios/sdk/src/JitsiMeet.m

@@ -23,6 +23,7 @@
 #import "RCTBridgeWrapper.h"
 #import "ReactUtils.h"
 #import "RNSplashScreen.h"
+#import "ScheenshareEventEmiter.h"
 
 #import <RNGoogleSignin/RNGoogleSignin.h>
 #import <WebRTC/RTCLogging.h>
@@ -31,6 +32,7 @@
 @implementation JitsiMeet {
     RCTBridgeWrapper *_bridgeWrapper;
     NSDictionary *_launchOptions;
+    ScheenshareEventEmiter *_screenshareEventEmiter;
 }
 
 #pragma mak - This class is a singleton
@@ -50,6 +52,9 @@
     if (self = [super init]) {
         // Initialize the on and only bridge for interfacing with React Native.
         _bridgeWrapper = [[RCTBridgeWrapper alloc] init];
+        
+        // Initialize the listener for handling start/stop screensharing notifications.
+        _screenshareEventEmiter = [[ScheenshareEventEmiter alloc] init];
 
         // Register a fatal error handler for React.
         registerReactFatalErrorHandler();

ios/sdk/src/ScheenshareEventEmiter.h

@@ -0,0 +1,25 @@
+/*
+ * Copyright @ 2021-present 8x8, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface ScheenshareEventEmiter : NSObject
+
+@end
+
+NS_ASSUME_NONNULL_END

ios/sdk/src/ScheenshareEventEmiter.m

@@ -0,0 +1,63 @@
+/*
+ * Copyright @ 2021-present 8x8, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import "ScheenshareEventEmiter.h"
+#import "JitsiMeet+Private.h"
+#import "ExternalAPI.h"
+
+NSNotificationName const kBroadcastStartedNotification = @"iOS_BroadcastStarted";
+NSNotificationName const kBroadcastStoppedNotification = @"iOS_BroadcastStopped";
+
+@implementation ScheenshareEventEmiter {
+    CFNotificationCenterRef _notificationCenter;
+}
+
+- (instancetype)init {
+    self = [super init];
+    if (self) {
+        _notificationCenter = CFNotificationCenterGetDarwinNotifyCenter();
+        [self setupObserver];
+    }
+    
+    return self;
+}
+
+- (void)dealloc {
+    [self clearObserver];
+}
+
+// MARK: Private Methods
+
+- (void)setupObserver {
+    CFNotificationCenterAddObserver(_notificationCenter, (__bridge const void *)(self), broadcastToggleNotificationCallback, (__bridge CFStringRef)kBroadcastStartedNotification, NULL, CFNotificationSuspensionBehaviorDeliverImmediately);
+    CFNotificationCenterAddObserver(_notificationCenter, (__bridge const void *)(self), broadcastToggleNotificationCallback, (__bridge CFStringRef)kBroadcastStoppedNotification, NULL, CFNotificationSuspensionBehaviorDeliverImmediately);
+}
+
+- (void)clearObserver {
+    CFNotificationCenterRemoveObserver(_notificationCenter, (__bridge const void *)(self), (__bridge CFStringRef)kBroadcastStartedNotification, NULL);
+    CFNotificationCenterRemoveObserver(_notificationCenter, (__bridge const void *)(self), (__bridge CFStringRef)kBroadcastStoppedNotification, NULL);
+}
+
+void broadcastToggleNotificationCallback(CFNotificationCenterRef center,
+                                         void *observer,
+                                         CFStringRef name,
+                                         const void *object,
+                                         CFDictionaryRef userInfo) {
+    ExternalAPI *externalAPI = [[JitsiMeet sharedInstance] getExternalAPI];
+    [externalAPI toggleScreenShare];
+}
+
+@end

package-lock.json

@@ -14071,9 +14071,8 @@
       "integrity": "sha512-iqdJ1KpZbR4XGahgVmaeibB7kDhyMT7wrylINgJaYBY38IAiI0LF32VX1umO4pko6n21YF5I/kSeNQ+OXGqqow=="
     },
     "react-native-webrtc": {
-      "version": "1.87.3",
-      "resolved": "https://registry.npmjs.org/react-native-webrtc/-/react-native-webrtc-1.87.3.tgz",
-      "integrity": "sha512-fWnaEHFCFD7YnPR95aaUqLQ5b4dY4av0qHjmwHXeLHGvGrVeWF1je9PNhet7PDHUIJa4GIYKB/8+co51SXm5dA==",
+      "version": "github:react-native-webrtc/react-native-webrtc#1066b92d48048d67ff23288d68ab1734ec364cab",
+      "from": "github:react-native-webrtc/react-native-webrtc#1066b92d48048d67ff23288d68ab1734ec364cab",
       "requires": {
         "base64-js": "^1.1.2",
         "cross-os": "^1.3.0",

package.json

@@ -84,7 +84,7 @@
     "react-native-svg-transformer": "0.14.3",
     "react-native-url-polyfill": "1.2.0",
     "react-native-watch-connectivity": "0.4.3",
-    "react-native-webrtc": "1.87.3",
+    "react-native-webrtc": "github:react-native-webrtc/react-native-webrtc#1066b92d48048d67ff23288d68ab1734ec364cab",
     "react-native-webview": "11.0.2",
     "react-native-youtube-iframe": "1.2.3",
     "react-redux": "7.1.0",

react/features/mobile/picture-in-picture/functions.js

@@ -11,5 +11,7 @@ import { NativeModules } from 'react-native';
 export function setPictureInPictureDisabled(disabled: boolean) {
     const { PictureInPicture } = NativeModules;
 
-    PictureInPicture.setPictureInPictureDisabled(disabled);
+    if (PictureInPicture) {
+        PictureInPicture.setPictureInPictureDisabled(disabled);
+    }
 }

react/features/toolbox/components/native/ScreenSharingAndroidButton.js

@@ -0,0 +1,74 @@
+// @flow
+
+import { translate } from '../../../base/i18n';
+import { IconShareDesktop } from '../../../base/icons';
+import { connect } from '../../../base/redux';
+import { AbstractButton, type AbstractButtonProps } from '../../../base/toolbox/components';
+import { toggleScreensharing, isLocalVideoTrackDesktop } from '../../../base/tracks';
+
+/**
+ * The type of the React {@code Component} props of {@link ScreenSharingAndroidButton}.
+ */
+type Props = AbstractButtonProps & {
+
+    /**
+     * Whether video is currently muted or not.
+     */
+    _screensharing: boolean,
+
+    /**
+     * The redux {@code dispatch} function.
+     */
+    dispatch: Function
+};
+
+/**
+ * An implementation of a button for toggling screen sharing.
+ */
+class ScreenSharingAndroidButton extends AbstractButton<Props, *> {
+    accessibilityLabel = 'toolbar.accessibilityLabel.shareYourScreen';
+    icon = IconShareDesktop;
+    label = 'toolbar.startScreenSharing';
+    toggledLabel = 'toolbar.stopScreenSharing';
+
+    /**
+     * Handles clicking / pressing the button.
+     *
+     * @override
+     * @protected
+     * @returns {void}
+     */
+    _handleClick() {
+        this.props.dispatch(toggleScreensharing());
+    }
+
+    /**
+     * Indicates whether this button is in toggled state or not.
+     *
+     * @override
+     * @protected
+     * @returns {boolean}
+     */
+    _isToggled() {
+        return this.props._screensharing;
+    }
+}
+
+/**
+ * Maps (parts of) the redux state to the associated props for the
+ * {@code ToggleCameraButton} component.
+ *
+ * @param {Object} state - The Redux state.
+ * @private
+ * @returns {{
+ *     _disabled: boolean,
+ *     _screensharing: boolean
+ * }}
+ */
+function _mapStateToProps(state): Object {
+    return {
+        _screensharing: isLocalVideoTrackDesktop(state)
+    };
+}
+
+export default translate(connect(_mapStateToProps)(ScreenSharingAndroidButton));

react/features/toolbox/components/native/ScreenSharingButton.js

@@ -1,77 +1,18 @@
-// @flow
-
+import React from 'react';
 import { Platform } from 'react-native';
 
-import { translate } from '../../../base/i18n';
-import { IconShareDesktop } from '../../../base/icons';
-import { connect } from '../../../base/redux';
-import { AbstractButton, type AbstractButtonProps } from '../../../base/toolbox/components';
-import { toggleScreensharing, isLocalVideoTrackDesktop } from '../../../base/tracks';
-
-/**
- * The type of the React {@code Component} props of {@link ScreenSharingButton}.
- */
-type Props = AbstractButtonProps & {
-
-    /**
-     * Whether video is currently muted or not.
-     */
-    _screensharing: boolean,
-
-    /**
-     * The redux {@code dispatch} function.
-     */
-    dispatch: Function
-};
-
-/**
- * An implementation of a button for toggling screen sharing.
- */
-class ScreenSharingButton extends AbstractButton<Props, *> {
-    accessibilityLabel = 'toolbar.accessibilityLabel.shareYourScreen';
-    icon = IconShareDesktop;
-    label = 'toolbar.startScreenSharing';
-    toggledLabel = 'toolbar.stopScreenSharing';
-
-    /**
-     * Handles clicking / pressing the button.
-     *
-     * @override
-     * @protected
-     * @returns {void}
-     */
-    _handleClick() {
-        this.props.dispatch(toggleScreensharing());
-    }
-
-    /**
-     * Indicates whether this button is in toggled state or not.
-     *
-     * @override
-     * @protected
-     * @returns {boolean}
-     */
-    _isToggled() {
-        return this.props._screensharing;
-    }
-}
-
-/**
- * Maps (parts of) the redux state to the associated props for the
- * {@code ToggleCameraButton} component.
- *
- * @param {Object} state - The Redux state.
- * @private
- * @returns {{
- *     _disabled: boolean,
- *     _screensharing: boolean
- * }}
- */
-function _mapStateToProps(state): Object {
-    return {
-        _screensharing: isLocalVideoTrackDesktop(state),
-        visible: Platform.OS === 'android'
-    };
-}
-
-export default translate(connect(_mapStateToProps)(ScreenSharingButton));
+import ScreenSharingAndroidButton from './ScreenSharingAndroidButton.js';
+import ScreenSharingIosButton from './ScreenSharingIosButton.js';
+
+const ScreenSharingButton = props => (
+    <>
+        {Platform.OS === 'android'
+            && <ScreenSharingAndroidButton { ...props } />
+        }
+        {Platform.OS === 'ios'
+            && <ScreenSharingIosButton { ...props } />
+        }
+    </>
+);
+
+export default ScreenSharingButton;

react/features/toolbox/components/native/ScreenSharingIosButton.js

@@ -0,0 +1,132 @@
+// @flow
+
+import React from 'react';
+import { findNodeHandle, NativeModules, Platform } from 'react-native';
+import { ScreenCapturePickerView } from 'react-native-webrtc';
+
+import { translate } from '../../../base/i18n';
+import { IconShareDesktop } from '../../../base/icons';
+import { connect } from '../../../base/redux';
+import { AbstractButton, type AbstractButtonProps } from '../../../base/toolbox/components';
+import { isLocalVideoTrackDesktop } from '../../../base/tracks';
+
+/**
+ * The type of the React {@code Component} props of {@link ScreenSharingIosButton}.
+ */
+type Props = AbstractButtonProps & {
+
+    /**
+     * Whether video is currently muted or not.
+     */
+    _screensharing: boolean,
+
+    /**
+     * The redux {@code dispatch} function.
+     */
+    dispatch: Function
+};
+
+const styles = {
+    screenCapturePickerView: {
+        display: 'none'
+    }
+};
+
+/**
+ * An implementation of a button for toggling screen sharing on iOS.
+ */
+class ScreenSharingIosButton extends AbstractButton<Props, *> {
+  _nativeComponent: ?Object;
+  _setNativeComponent: Function;
+
+  accessibilityLabel = 'toolbar.accessibilityLabel.shareYourScreen';
+  icon = IconShareDesktop;
+  label = 'toolbar.startScreenSharing';
+  toggledLabel = 'toolbar.stopScreenSharing';
+
+  /**
+   * Initializes a new {@code ScreenSharingIosButton} instance.
+   *
+   * @param {Object} props - The React {@code Component} props to initialize
+   * the new {@code ScreenSharingIosButton} instance with.
+   */
+  constructor(props) {
+      super(props);
+
+      this._nativeComponent = null;
+
+      // Bind event handlers so they are only bound once per instance.
+      this._setNativeComponent = this._setNativeComponent.bind(this);
+  }
+
+  /**
+    * Sets the internal reference to the React Component wrapping the
+    * {@code RPSystemBroadcastPickerView} component.
+    *
+    * @param {ReactComponent} component - React Component.
+    * @returns {void}
+    */
+  _setNativeComponent(component) {
+      this._nativeComponent = component;
+  }
+
+  /**
+   * Handles clicking / pressing the button.
+   *
+   * @override
+   * @protected
+   * @returns {void}
+   */
+  _handleClick() {
+      const handle = findNodeHandle(this._nativeComponent);
+
+      NativeModules.ScreenCapturePickerViewManager.show(handle);
+  }
+
+  /**
+   * Indicates whether this button is in toggled state or not.
+   *
+   * @override
+   * @protected
+   * @returns {boolean}
+   */
+  _isToggled() {
+      return this.props._screensharing;
+  }
+
+  /**
+   * Helper function to be implemented by subclasses, which may return a
+   * new React Element to be appended at the end of the button.
+   *
+   * @protected
+   * @returns {ReactElement|null}
+   */
+  _getElementAfter() {
+      return (
+          <ScreenCapturePickerView
+              ref = { this._setNativeComponent }
+              style = { styles.screenCapturePickerView } />
+      );
+  }
+}
+
+/**
+ * Maps (parts of) the redux state to the associated props for the
+ * {@code ScreenSharingIosButton} component.
+ *
+ * @param {Object} state - The Redux state.
+ * @private
+ * @returns {{
+ *     _disabled: boolean,
+ * }}
+ */
+function _mapStateToProps(state): Object {
+    return {
+        _screensharing: isLocalVideoTrackDesktop(state),
+
+        // TODO: this should work on iOS 12 too, but our trick to show the picker doesn't work.
+        visible: Platform.OS === 'ios' && Platform.Version.split('.')[0] >= 14
+    };
+}
+
+export default translate(connect(_mapStateToProps)(ScreenSharingIosButton));