Camera and editor improvements

submodules/Camera/Sources/Camera.swift

@@ -142,8 +142,17 @@ private final class CameraContext {
         self.session.stopRunning()
     }
     
-    func focus(at point: CGPoint) {
-        self.device.setFocusPoint(point, focusMode: .continuousAutoFocus, exposureMode: .continuousAutoExposure, monitorSubjectAreaChange: true)
+    func focus(at point: CGPoint, autoFocus: Bool) {
+        let focusMode: AVCaptureDevice.FocusMode
+        let exposureMode: AVCaptureDevice.ExposureMode
+        if autoFocus {
+            focusMode = .continuousAutoFocus
+            exposureMode = .continuousAutoExposure
+        } else {
+            focusMode = .autoFocus
+            exposureMode = .autoExpose
+        }
+        self.device.setFocusPoint(point, focusMode: focusMode, exposureMode: exposureMode, monitorSubjectAreaChange: true)
     }
     
     func setFps(_ fps: Float64) {
@@ -276,6 +285,9 @@ public final class Camera {
         self.metrics = Camera.Metrics(model: DeviceModel.current)
         
         let session = AVCaptureSession()
+        session.usesApplicationAudioSession = true
+        session.automaticallyConfiguresApplicationAudioSession = false
+        session.automaticallyConfiguresCaptureDeviceForWideColor = false
         if let previewView {
             previewView.session = session
         }
@@ -373,10 +385,10 @@ public final class Camera {
         }
     }
     
-    public func focus(at point: CGPoint) {
+    public func focus(at point: CGPoint, autoFocus: Bool = true) {
         self.queue.async {
             if let context = self.contextRef?.takeUnretainedValue() {
-                context.focus(at: point)
+                context.focus(at: point, autoFocus: autoFocus)
             }
         }
     }

submodules/Camera/Sources/CameraDevice.swift

@@ -8,9 +8,21 @@ private let defaultFPS: Double = 30.0
 final class CameraDevice {
     var position: Camera.Position = .back
     
+    deinit {
+        if let videoDevice = self.videoDevice {
+            self.unsubscribeFromChanges(videoDevice)
+        }
+    }
+    
     public private(set) var videoDevice: AVCaptureDevice? = nil {
         didSet {
+            if let previousVideoDevice = oldValue {
+                self.unsubscribeFromChanges(previousVideoDevice)
+            }
             self.videoDevicePromise.set(.single(self.videoDevice))
+            if let videoDevice = self.videoDevice {
+                self.subscribeForChanges(videoDevice)
+            }
         }
     }
     private var videoDevicePromise = Promise<AVCaptureDevice?>()
@@ -93,12 +105,12 @@ final class CameraDevice {
         }
     }
     
-    private func subscribeForChanges() {
-        NotificationCenter.default.addObserver(self, selector: #selector(self.subjectAreaChanged), name: Notification.Name.AVCaptureDeviceSubjectAreaDidChange, object: self.videoDevice)
+    private func subscribeForChanges(_ device: AVCaptureDevice) {
+        NotificationCenter.default.addObserver(self, selector: #selector(self.subjectAreaChanged), name: Notification.Name.AVCaptureDeviceSubjectAreaDidChange, object: device)
     }
     
-    private func unsubscribeFromChanges() {
-        NotificationCenter.default.removeObserver(self, name: Notification.Name.AVCaptureDeviceSubjectAreaDidChange, object: self.videoDevice)
+    private func unsubscribeFromChanges(_ device: AVCaptureDevice) {
+        NotificationCenter.default.removeObserver(self, name: Notification.Name.AVCaptureDeviceSubjectAreaDidChange, object: device)
     }
     
     @objc private func subjectAreaChanged() {
@@ -171,6 +183,12 @@ final class CameraDevice {
                 device.focusPointOfInterest = point
                 device.focusMode = focusMode
             }
+            
+            device.isSubjectAreaChangeMonitoringEnabled = monitorSubjectAreaChange
+            
+            if abs(device.exposureTargetBias) > 0.0 {
+                device.setExposureTargetBias(0.0)
+            }
         }
     }
     

submodules/Camera/Sources/CameraOutput.swift

@@ -109,11 +109,12 @@ final class CameraOutput: NSObject {
     
     func configureVideoStabilization() {
         if let videoDataOutputConnection = self.videoOutput.connection(with: .video), videoDataOutputConnection.isVideoStabilizationSupported {
-            if #available(iOS 13.0, *) {
-                videoDataOutputConnection.preferredVideoStabilizationMode = .cinematicExtended
-            } else {
-                videoDataOutputConnection.preferredVideoStabilizationMode = .cinematic
-            }
+            videoDataOutputConnection.preferredVideoStabilizationMode = .standard
+//            if #available(iOS 13.0, *) {
+//                videoDataOutputConnection.preferredVideoStabilizationMode = .cinematicExtended
+//            } else {
+//                videoDataOutputConnection.preferredVideoStabilizationMode = .cinematic
+//            }
         }
     }
     
@@ -178,7 +179,7 @@ final class CameraOutput: NSObject {
         let outputFileName = NSUUID().uuidString
         let outputFilePath = NSTemporaryDirectory() + outputFileName + ".mp4"
         let outputFileURL = URL(fileURLWithPath: outputFilePath)
-        let videoRecorder = VideoRecorder(preset: MediaPreset(videoSettings: videoSettings, audioSettings: audioSettings), videoTransform: CGAffineTransform(rotationAngle: .pi / 2.0), fileUrl: outputFileURL, completion: { [weak self] result in
+        let videoRecorder = VideoRecorder(configuration: VideoRecorder.Configuration(videoSettings: videoSettings, audioSettings: audioSettings), videoTransform: CGAffineTransform(rotationAngle: .pi / 2.0), fileUrl: outputFileURL, completion: { [weak self] result in
             if case .success = result {
                 self?.recordingCompletionPipe.putNext(outputFilePath)
             } else {
@@ -186,7 +187,8 @@ final class CameraOutput: NSObject {
             }
         })
         
-        videoRecorder.start()
+        
+        videoRecorder?.start()
         self.videoRecorder = videoRecorder
         
         return Signal { subscriber in
@@ -244,13 +246,8 @@ extension CameraOutput: AVCaptureVideoDataOutputSampleBufferDelegate, AVCaptureA
 //            self.processSampleBuffer?(finalVideoPixelBuffer, connection)
 //        }
         
-        if let videoRecorder = self.videoRecorder, videoRecorder.isRecording || videoRecorder.isStopping {
-            let mediaType = sampleBuffer.type
-            if mediaType == kCMMediaType_Video {
-                videoRecorder.appendVideo(sampleBuffer: sampleBuffer)
-            } else if mediaType == kCMMediaType_Audio {
-                videoRecorder.appendAudio(sampleBuffer: sampleBuffer)
-            }
+        if let videoRecorder = self.videoRecorder, videoRecorder.isRecording {
+            videoRecorder.appendSampleBuffer(sampleBuffer)
         }
     }
     

submodules/Camera/Sources/CameraPreviewView.swift

@@ -108,6 +108,10 @@ public class CameraSimplePreviewView: UIView {
         }
         |> distinctUntilChanged
     }
+    
+    public func cameraPoint(for location: CGPoint) -> CGPoint {
+        return self.videoPreviewLayer.captureDevicePointConverted(fromLayerPoint: location)
+    }
 }
 
 public class CameraPreviewView: MTKView {

submodules/Camera/Sources/VideoRecorder.swift

@@ -1,129 +1,439 @@
 import Foundation
 import AVFoundation
 import SwiftSignalKit
+import TelegramCore
 
-struct MediaPreset {
-    var videoSettings: [String: Any]
-    var audioSettings: [String: Any]
-    
-    init(videoSettings: [String: Any], audioSettings: [String: Any]) {
-        self.videoSettings = videoSettings
-        self.audioSettings = audioSettings
-    }
-    
-    var hasAudio: Bool {
-        return !self.audioSettings.isEmpty
+private extension CMSampleBuffer {
+    var endTime: CMTime {
+        let presentationTime = CMSampleBufferGetPresentationTimeStamp(self)
+        let duration = CMSampleBufferGetDuration(self)
+        return presentationTime + duration
     }
 }
 
-final class VideoRecorder {
+private final class VideoRecorderImpl {
+    public enum RecorderError: LocalizedError {
+        case generic
+        case avError(Error)
+       
+        public var errorDescription: String? {
+            switch self {
+            case .generic:
+                return "Error"
+            case let .avError(error):
+                return error.localizedDescription
+            }
+        }
+    }
+    
+    private let queue = DispatchQueue(label: "VideoRecorder")
+    
+    private var assetWriter: AVAssetWriter
+    private var videoInput: AVAssetWriterInput?
+    private var audioInput: AVAssetWriterInput?
+    
+    private var pendingAudioSampleBuffers: [CMSampleBuffer] = []
+    
+    private var _duration: CMTime = .zero
+    public var duration: CMTime {
+        self.queue.sync { _duration }
+    }
+        
+    private var lastVideoSampleTime: CMTime = .invalid
+    private var recordingStartSampleTime: CMTime = .invalid
+    private var recordingStopSampleTime: CMTime = .invalid
+    
+    private let configuration: VideoRecorder.Configuration
+    private let videoTransform: CGAffineTransform
+    private let url: URL
+    fileprivate var completion: (Bool) -> Void = { _ in }
+    
+    private let error = Atomic<Error?>(value: nil)
+    
+    private var stopped = false
+    private var hasAllVideoBuffers = false
+    private var hasAllAudioBuffers = false
+    
+    public init?(configuration: VideoRecorder.Configuration, videoTransform: CGAffineTransform, fileUrl: URL) {
+        self.configuration = configuration
+        self.videoTransform = videoTransform
+        self.url = fileUrl
+        
+        try? FileManager.default.removeItem(at: url)
+        guard let assetWriter = try? AVAssetWriter(url: url, fileType: .mp4) else {
+            return nil
+        }
+        self.assetWriter = assetWriter
+        self.assetWriter.shouldOptimizeForNetworkUse = false
+    }
+    
+    private func hasError() -> Error? {
+        return self.error.with { $0 }
+    }
+    
+    public func start() {
+        self.queue.async {
+            self.recordingStartSampleTime = CMTime(seconds: CACurrentMediaTime(), preferredTimescale: CMTimeScale(NSEC_PER_SEC))
+        }
+    }
+    
+    public func appendVideoSampleBuffer(_ sampleBuffer: CMSampleBuffer) {
+        if let _ = self.hasError() {
+            return
+        }
+        
+        guard let formatDescription = CMSampleBufferGetFormatDescription(sampleBuffer), CMFormatDescriptionGetMediaType(formatDescription) == kCMMediaType_Video else {
+            return
+        }
+
+        let presentationTime = CMSampleBufferGetPresentationTimeStamp(sampleBuffer)
+        self.queue.async {
+            guard !self.stopped && self.error.with({ $0 }) == nil else {
+                return
+            }
+            
+            var failed = false
+            if self.videoInput == nil {
+                let videoSettings = self.configuration.videoSettings
+                if self.assetWriter.canApply(outputSettings: videoSettings, forMediaType: .video) {
+                    let videoInput = AVAssetWriterInput(mediaType: .video, outputSettings: videoSettings, sourceFormatHint: formatDescription)
+                    videoInput.expectsMediaDataInRealTime = true
+                    videoInput.transform = self.videoTransform
+                    if self.assetWriter.canAdd(videoInput) {
+                        self.assetWriter.add(videoInput)
+                        self.videoInput = videoInput
+                    } else {
+                        failed = true
+                    }
+                } else {
+                    failed = true
+                }
+            }
+            
+            if failed {
+                print("error")
+                return
+            }
+                        
+            if self.assetWriter.status == .unknown {
+                if sampleBuffer.presentationTimestamp < self.recordingStartSampleTime {
+                    return
+                }
+                if !self.assetWriter.startWriting() {
+                    if let error = self.assetWriter.error {
+                        self.transitionToFailedStatus(error: .avError(error))
+                        return
+                    }
+                }
+                
+                self.assetWriter.startSession(atSourceTime: presentationTime)
+                self.recordingStartSampleTime = presentationTime
+                self.lastVideoSampleTime = presentationTime
+            }
+            
+            if self.assetWriter.status == .writing {
+                if self.recordingStopSampleTime != .invalid && sampleBuffer.presentationTimestamp > self.recordingStopSampleTime {
+                    self.hasAllVideoBuffers = true
+                    self.maybeFinish()
+                    return
+                }
+                
+                if let videoInput = self.videoInput, videoInput.isReadyForMoreMediaData {
+                    if videoInput.append(sampleBuffer) {
+                        self.lastVideoSampleTime = presentationTime
+                        let startTime = self.recordingStartSampleTime
+                        let duration = presentationTime - startTime
+                        self._duration = duration
+                    } else {
+                        print("error")
+                    }
+                    if !self.tryAppendingPendingAudioBuffers() {
+                        self.transitionToFailedStatus(error: .generic)
+                    }
+                }
+            }
+        }
+    }
+    
+    public func appendAudioSampleBuffer(_ sampleBuffer: CMSampleBuffer) {
+        if let _ = self.hasError() {
+            return
+        }
+        
+        guard let formatDescription = CMSampleBufferGetFormatDescription(sampleBuffer), CMFormatDescriptionGetMediaType(formatDescription) == kCMMediaType_Audio else {
+            return
+        }
+        
+        self.queue.async {
+            guard !self.stopped && self.error.with({ $0 }) == nil else {
+                return
+            }
+            
+            var failed = false
+            if self.audioInput == nil {
+                var audioSettings = self.configuration.audioSettings
+                if let currentAudioStreamBasicDescription = CMAudioFormatDescriptionGetStreamBasicDescription(formatDescription) {
+                    audioSettings[AVSampleRateKey] = currentAudioStreamBasicDescription.pointee.mSampleRate
+                    audioSettings[AVNumberOfChannelsKey] = currentAudioStreamBasicDescription.pointee.mChannelsPerFrame
+                }
+                
+                var audioChannelLayoutSize: Int = 0
+                let currentChannelLayout = CMAudioFormatDescriptionGetChannelLayout(formatDescription, sizeOut: &audioChannelLayoutSize)
+                let currentChannelLayoutData: Data
+                if let currentChannelLayout = currentChannelLayout, audioChannelLayoutSize > 0 {
+                    currentChannelLayoutData = Data(bytes: currentChannelLayout, count: audioChannelLayoutSize)
+                } else {
+                    currentChannelLayoutData = Data()
+                }
+                audioSettings[AVChannelLayoutKey] = currentChannelLayoutData
+                
+                if self.assetWriter.canApply(outputSettings: audioSettings, forMediaType: .audio) {
+                    let audioInput = AVAssetWriterInput(mediaType: .audio, outputSettings: audioSettings, sourceFormatHint: formatDescription)
+                    audioInput.expectsMediaDataInRealTime = true
+                    if self.assetWriter.canAdd(audioInput) {
+                        self.assetWriter.add(audioInput)
+                        self.audioInput = audioInput
+                    } else {
+                        failed = true
+                    }
+                } else {
+                    failed = true
+                }
+            }
+
+            if failed {
+                print("error")
+                return
+            }
+                                    
+            if self.assetWriter.status == .writing {
+                if sampleBuffer.presentationTimestamp < self.recordingStartSampleTime {
+                    return
+                }
+                if self.recordingStopSampleTime != .invalid && sampleBuffer.presentationTimestamp > self.recordingStopSampleTime {
+                    self.hasAllAudioBuffers = true
+                    self.maybeFinish()
+                    return
+                }
+                var result = false
+                if self.tryAppendingPendingAudioBuffers() {
+                    if self.tryAppendingAudioSampleBuffer(sampleBuffer) {
+                        result = true
+                    }
+                }
+                if !result {
+                    self.transitionToFailedStatus(error: .generic)
+                }
+            }
+        }
+    }
+    
+    public func cancelRecording(completion: @escaping () -> Void) {
+        self.queue.async {
+            if self.stopped {
+                DispatchQueue.main.async {
+                    completion()
+                }
+                return
+            }
+            self.stopped = true
+            self.pendingAudioSampleBuffers = []
+            if self.assetWriter.status == .writing {
+                self.assetWriter.cancelWriting()
+            }
+            let fileManager = FileManager()
+            try? fileManager.removeItem(at: self.url)
+            DispatchQueue.main.async {
+                completion()
+            }
+        }
+    }
+    
+    public var isRecording: Bool {
+        self.queue.sync { !(self.hasAllVideoBuffers && self.hasAllAudioBuffers) }
+    }
+    
+    public func stopRecording() {
+        self.queue.async {
+            self.recordingStopSampleTime = CMTime(seconds: CACurrentMediaTime(), preferredTimescale: CMTimeScale(NSEC_PER_SEC))
+        }
+    }
+    
+    public func maybeFinish() {
+        self.queue.async {
+            guard self.hasAllVideoBuffers && self.hasAllVideoBuffers else {
+                return
+            }
+            self.stopped = true
+            self.finish()
+        }
+    }
+    
+    public func finish() {
+        self.queue.async {
+            let completion = self.completion
+            if self.recordingStopSampleTime == .invalid {
+                DispatchQueue.main.async {
+                    completion(false)
+                }
+                return
+            }
+                        
+            if let _ = self.error.with({ $0 }) {
+                DispatchQueue.main.async {
+                    completion(false)
+                }
+                return
+            }
+            
+            if !self.tryAppendingPendingAudioBuffers() {
+                DispatchQueue.main.async {
+                    completion(false)
+                }
+                return
+            }
+            
+            if self.assetWriter.status == .writing {
+                self.assetWriter.finishWriting {
+                    if let _ = self.assetWriter.error {
+                        DispatchQueue.main.async {
+                            completion(false)
+                        }
+                    } else {
+                        DispatchQueue.main.async {
+                            completion(true)
+                        }
+                    }
+                }
+            } else if let _ = self.assetWriter.error {
+                DispatchQueue.main.async {
+                    completion(true)
+                }
+            } else {
+                DispatchQueue.main.async {
+                    completion(true)
+                }
+            }
+        }
+    }
+    
+    private func tryAppendingPendingAudioBuffers() -> Bool {
+        dispatchPrecondition(condition: .onQueue(self.queue))
+        guard self.pendingAudioSampleBuffers.count > 0 else {
+            return true
+        }
+        
+        var result = true
+        let (sampleBuffersToAppend, pendingSampleBuffers) = self.pendingAudioSampleBuffers.stableGroup(using: { $0.endTime <= self.lastVideoSampleTime })
+        for sampleBuffer in sampleBuffersToAppend {
+            if !self.internalAppendAudioSampleBuffer(sampleBuffer) {
+                result = false
+                break
+            }
+        }
+        self.pendingAudioSampleBuffers = pendingSampleBuffers
+        return result
+    }
+    
+    private func tryAppendingAudioSampleBuffer(_ sampleBuffer: CMSampleBuffer) -> Bool {
+        dispatchPrecondition(condition: .onQueue(self.queue))
+        
+        var result = true
+        if sampleBuffer.endTime > self.lastVideoSampleTime {
+            self.pendingAudioSampleBuffers.append(sampleBuffer)
+        } else {
+            result = self.internalAppendAudioSampleBuffer(sampleBuffer)
+        }
+        return result
+    }
+    
+    private func internalAppendAudioSampleBuffer(_ sampleBuffer: CMSampleBuffer) -> Bool {
+        if let audioInput = self.audioInput, audioInput.isReadyForMoreMediaData {
+            if !audioInput.append(sampleBuffer) {
+                if let _ = self.assetWriter.error {
+                    return false
+                }
+            }
+        } else {
+            
+        }
+        return true
+    }
+    
+    private func transitionToFailedStatus(error: RecorderError) {
+        let _ = self.error.modify({ _ in return error })
+    }
+}
+
+private extension Sequence {
+    func stableGroup(using predicate: (Element) throws -> Bool) rethrows -> ([Element], [Element]) {
+        var trueGroup: [Element] = []
+        var falseGroup: [Element] = []
+        for element in self {
+            if try predicate(element) {
+                trueGroup.append(element)
+            } else {
+                falseGroup.append(element)
+            }
+        }
+        return (trueGroup, falseGroup)
+    }
+}
+
+public final class VideoRecorder {
+    var duration: Double? {
+        return self.impl.duration.seconds
+    }
+    
     enum Result {
         enum Error {
             case generic
         }
         
         case success
+        case initError(Error)
         case writeError(Error)
         case finishError(Error)
     }
     
+    struct Configuration {
+        var videoSettings: [String: Any]
+        var audioSettings: [String: Any]
+
+        init(videoSettings: [String: Any], audioSettings: [String: Any]) {
+            self.videoSettings = videoSettings
+            self.audioSettings = audioSettings
+        }
+
+        var hasAudio: Bool {
+            return !self.audioSettings.isEmpty
+        }
+    }
+    
+    private let impl: VideoRecorderImpl
+    fileprivate let configuration: Configuration
+    fileprivate let videoTransform: CGAffineTransform
+    fileprivate let fileUrl: URL
     private let completion: (Result) -> Void
     
-    private let queue = Queue()
-    private var assetWriter: AVAssetWriter?
+    public var isRecording: Bool {
+        return self.impl.isRecording
+    }
     
-    private var videoInput: AVAssetWriterInput?
-    private var audioInput: AVAssetWriterInput?
-    
-    private let preset: MediaPreset
-    private let videoTransform: CGAffineTransform
-    private let fileUrl: URL
-    
-    private (set) var isRecording = false
-    private (set) var isStopping = false
-    private var finishedWriting = false
-    
-    private var captureStartTimestamp: Double?
-    private var firstVideoTimestamp: CMTime?
-    private var lastVideoTimestamp: CMTime?
-    private var lastAudioTimestamp: CMTime?
-    
-    private var pendingAudioBuffers: [CMSampleBuffer] = []
-    
-    init(preset: MediaPreset, videoTransform: CGAffineTransform, fileUrl: URL, completion: @escaping (Result) -> Void) {
-        self.preset = preset
+    init?(configuration: Configuration, videoTransform: CGAffineTransform, fileUrl: URL, completion: @escaping (Result) -> Void) {
+        self.configuration = configuration
         self.videoTransform = videoTransform
         self.fileUrl = fileUrl
         self.completion = completion
-    }
-    
-    func start() {
-        self.queue.async {
-            guard self.assetWriter == nil else {
-                return
-            }
-            
-            self.captureStartTimestamp = CFAbsoluteTimeGetCurrent()
-            
-            guard let assetWriter = try? AVAssetWriter(url: self.fileUrl, fileType: .mp4) else {
-                return
-            }
-            
-            let videoInput = AVAssetWriterInput(mediaType: .video, outputSettings: self.preset.videoSettings)
-            videoInput.expectsMediaDataInRealTime = true
-            videoInput.transform = self.videoTransform
-            if assetWriter.canAdd(videoInput) {
-                assetWriter.add(videoInput)
-            }
-            
-            let audioInput: AVAssetWriterInput?
-            if self.preset.hasAudio {
-                audioInput = AVAssetWriterInput(mediaType: .audio, outputSettings: self.preset.audioSettings)
-                audioInput!.expectsMediaDataInRealTime = true
-                if assetWriter.canAdd(audioInput!) {
-                    assetWriter.add(audioInput!)
-                }
-            } else {
-                audioInput = nil
-            }
-            
-            self.assetWriter = assetWriter
-            self.videoInput = videoInput
-            self.audioInput = audioInput
-            
-            self.isRecording = true
-            
-            //assetWriter.startWriting()
-        }
-    }
-    
-    func stop() {
-        self.queue.async {
-            guard let captureStartTimestamp = self.captureStartTimestamp, abs(CFAbsoluteTimeGetCurrent() - captureStartTimestamp) > 0.5 else {
-                return
-            }
-            
-            self.isStopping = true
-            
-            if self.audioInput == nil {
-                self.finish()
-            }
-        }
-    }
-    
-    private func finish() {
-        guard let assetWriter = self.assetWriter else {
-            return
-        }
         
-        self.queue.async {
-            self.isRecording = false
-            self.isStopping = false
-            
-            assetWriter.finishWriting {
-                self.finishedWriting = true
-                
-                if case .completed = assetWriter.status {
+        guard let impl = VideoRecorderImpl(configuration: configuration, videoTransform: videoTransform, fileUrl: fileUrl) else {
+            completion(.initError(.generic))
+            return nil
+        }
+        self.impl = impl
+        impl.completion = { [weak self] success in
+            if let self {
+                if success {
                     self.completion(.success)
                 } else {
                     self.completion(.finishError(.generic))
@@ -132,76 +442,25 @@ final class VideoRecorder {
         }
     }
     
-    func appendVideo(sampleBuffer: CMSampleBuffer) {
-        self.queue.async {
-            guard let assetWriter = self.assetWriter, let videoInput = self.videoInput, (self.isRecording || self.isStopping) && !self.finishedWriting else {
-                return
-            }
-            let timestamp = sampleBuffer.presentationTimestamp
-            if let startTimestamp = self.captureStartTimestamp, timestamp.seconds < startTimestamp {
-                return
-            }
-
-            switch assetWriter.status {
-            case .unknown:
-               break
-            case .writing:
-                if self.firstVideoTimestamp == nil {
-                    self.firstVideoTimestamp = timestamp
-                    assetWriter.startSession(atSourceTime: timestamp)
-                }
-                while !videoInput.isReadyForMoreMediaData {
-                    RunLoop.current.run(until: Date(timeIntervalSinceNow: 0.1))
-                }
-                
-                if videoInput.append(sampleBuffer) {
-                    self.lastVideoTimestamp = timestamp
-                }
-                
-                if self.audioInput != nil && self.isStopping, let lastVideoTimestamp = self.lastAudioTimestamp, let lastAudioTimestamp = self.lastAudioTimestamp, lastVideoTimestamp >= lastAudioTimestamp {
-                    self.finish()
-                }
-            case .failed:
-                self.isRecording = false
-                self.completion(.writeError(.generic))
-            default:
-                break
-            }
-        }
+    func start() {
+        self.impl.start()
     }
     
-    func appendAudio(sampleBuffer: CMSampleBuffer) {
-        self.queue.async {
-            guard let _ = self.assetWriter, let audioInput = self.audioInput, !self.isStopping && !self.finishedWriting else {
-                return
-            }
-            let timestamp = sampleBuffer.presentationTimestamp
-            
-            if let _ = self.firstVideoTimestamp {
-                if !self.pendingAudioBuffers.isEmpty {
-                    for buffer in self.pendingAudioBuffers {
-                        audioInput.append(buffer)
-                    }
-                    self.pendingAudioBuffers.removeAll()
-                }
-                
-                while !audioInput.isReadyForMoreMediaData {
-                    RunLoop.current.run(until: Date(timeIntervalSinceNow: 0.1))
-                }
-                
-                if audioInput.append(sampleBuffer) {
-                    self.lastAudioTimestamp = timestamp
-                }
-            } else {
-                self.pendingAudioBuffers.append(sampleBuffer)
-            }
-        }
+    func stop() {
+        self.impl.stopRecording()
     }
     
-    var duration: Double? {
-        guard let firstTimestamp = self.firstVideoTimestamp, let lastTimestamp = self.lastVideoTimestamp else {
-            return nil
+    func appendSampleBuffer(_ sampleBuffer: CMSampleBuffer) {
+        guard let formatDescriptor = CMSampleBufferGetFormatDescription(sampleBuffer) else {
+            return
+        }
+        let type = CMFormatDescriptionGetMediaType(formatDescriptor)
+        if type == kCMMediaType_Video {
+            self.impl.appendVideoSampleBuffer(sampleBuffer)
+        } else if type == kCMMediaType_Audio {
+            if self.configuration.hasAudio {
+                self.impl.appendAudioSampleBuffer(sampleBuffer)
+            }
         }
-        return (lastTimestamp - firstTimestamp).seconds
     }
 }

submodules/TelegramUI/Components/CameraScreen/Sources/CameraScreen.swift

@@ -840,7 +840,10 @@ public class CameraScreen: ViewController {
             let panGestureRecognizer = UIPanGestureRecognizer(target: self, action: #selector(self.handlePan(_:)))
             self.effectivePreviewView.addGestureRecognizer(panGestureRecognizer)
             
-            self.camera.focus(at: CGPoint(x: 0.5, y: 0.5))
+            let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(self.handleTap(_:)))
+            self.effectivePreviewView.addGestureRecognizer(tapGestureRecognizer)
+            
+            self.camera.focus(at: CGPoint(x: 0.5, y: 0.5), autoFocus: true)
             self.camera.startCapture()
         }
         
@@ -856,8 +859,6 @@ public class CameraScreen: ViewController {
             }
         }
         
-        private var previewInitialPosition: CGPoint?
-        private var controlsInitialPosition: CGPoint?
         @objc private func handlePan(_ gestureRecognizer: UIPanGestureRecognizer) {
             guard let controller = self.controller else {
                 return
@@ -865,8 +866,7 @@ public class CameraScreen: ViewController {
             let translation = gestureRecognizer.translation(in: gestureRecognizer.view)
             switch gestureRecognizer.state {
             case .began:
-                self.previewInitialPosition = self.previewContainerView.center
-                self.controlsInitialPosition = self.componentHost.view?.center
+                break
             case .changed:
                 if !"".isEmpty {
                     
@@ -888,6 +888,15 @@ public class CameraScreen: ViewController {
                 break
             }
         }
+        
+        @objc private func handleTap(_ gestureRecognizer: UITapGestureRecognizer) {
+            guard let previewView = self.simplePreviewView else {
+                return
+            }
+            let location = gestureRecognizer.location(in: previewView)
+            let point = previewView.cameraPoint(for: location)
+            self.camera.focus(at: point, autoFocus: false)
+        }
 
         func animateIn() {
             self.backgroundView.alpha = 0.0

submodules/TelegramUI/Components/MediaEditorScreen/Sources/MediaEditorScreen.swift

@@ -1160,7 +1160,7 @@ public final class MediaEditorScreen: ViewController {
             rotateGestureRecognizer.delegate = self
             self.previewContainerView.addGestureRecognizer(rotateGestureRecognizer)
             
-            let tapGestureRecognizer = UIPanGestureRecognizer(target: self, action: #selector(self.handleTap(_:)))
+            let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(self.handleTap(_:)))
             self.previewContainerView.addGestureRecognizer(tapGestureRecognizer)
             
             self.interaction = DrawingToolsInteraction(