|
1 | | -struct MSCaptureView { |
2 | | - var text = "Hello, World!" |
| 1 | +// |
| 2 | +// MSCaptureView.swift |
| 3 | +// MSCaptureView |
| 4 | +// |
| 5 | +// Created by Steve Sheets on 8/13/20. |
| 6 | +// Copyright © 2020 Steve Sheets. All rights reserved. |
| 7 | +// |
| 8 | + |
| 9 | +import Cocoa |
| 10 | +import AVFoundation |
| 11 | + |
| 12 | +// MARK: MSCaptureView Class |
| 13 | + |
| 14 | +/// NSView subclass to provied video capture and preview from Macintosh Cameria/Microphone |
| 15 | +public class MSCaptureView: NSView, AVCaptureFileOutputRecordingDelegate { |
| 16 | + |
| 17 | + // MARK: Static Properties |
| 18 | + |
| 19 | + /// Version information (major, minor, patch) |
| 20 | + public static let version = (1, 0, 0) |
| 21 | + |
| 22 | + // MARK: Type Alias |
| 23 | + |
| 24 | + /// Closure type that is passed the current Capture View and returns nothing |
| 25 | + public typealias StatusChangedEventClosure = (MSCaptureView) -> Void |
| 26 | + |
| 27 | + /// Closure type that is passed nothing View and returns nothing |
| 28 | + public typealias AuthorizedEventClosure = () -> Void |
| 29 | + |
| 30 | + // MARK: Private Property |
| 31 | + |
| 32 | + private var captureSession: AVCaptureSession? |
| 33 | + private var capturePreviewLayer: AVCaptureVideoPreviewLayer? |
| 34 | + private var captureDeviceInputCamera: AVCaptureDeviceInput? |
| 35 | + private var captureDeviceInputMicrophone: AVCaptureDeviceInput? |
| 36 | + private var captureMovieFileOutput: AVCaptureMovieFileOutput? |
| 37 | + private var captureURL: URL? |
| 38 | + |
| 39 | + // MARK: Public Properties |
| 40 | + |
| 41 | + /// Closure evoked when the recording starts |
| 42 | + public var captureRecordingStartedEvent: StatusChangedEventClosure? |
| 43 | + |
| 44 | + /// Closure evoked when the recording stops (either by call or by error). |
| 45 | + public var captureRecordingStoppedEvent: StatusChangedEventClosure? |
| 46 | + |
| 47 | + // MARK: Public Read-Only Properties |
| 48 | + |
| 49 | + /// Calculated property showing if the app has been authorized to use camera and microphone |
| 50 | + public var hasCaptureAuthorization: Bool { |
| 51 | + get { |
| 52 | + let videoStatus = AVCaptureDevice.authorizationStatus(for: .video) |
| 53 | + let microphoneStatus = AVCaptureDevice.authorizationStatus(for: .audio) |
| 54 | + |
| 55 | + if case .authorized = videoStatus, case .authorized = microphoneStatus { |
| 56 | + return true |
| 57 | + } |
| 58 | + |
| 59 | + return false |
| 60 | + } |
| 61 | + } |
| 62 | + |
| 63 | + /// Calculated property showing if the app has preview turned on. |
| 64 | + public var hasPreview: Bool { |
| 65 | + get { |
| 66 | + guard let session = captureSession else { return false } |
| 67 | + |
| 68 | + return session.isRunning |
| 69 | + } |
| 70 | + } |
| 71 | + |
| 72 | + /// Calculated property showing if the app has output url set. |
| 73 | + public var hasURL: Bool { |
| 74 | + get { |
| 75 | + return captureURL != nil |
| 76 | + } |
| 77 | + } |
| 78 | + |
| 79 | + /// Calculated property showing if the app is currently capturing |
| 80 | + public var isCapturing: Bool { |
| 81 | + get { |
| 82 | + guard let output = captureMovieFileOutput else { return false } |
| 83 | + |
| 84 | + return output.isRecording |
| 85 | + } |
| 86 | + } |
| 87 | + |
| 88 | + // MARK: Private Static Functions |
| 89 | + |
| 90 | + private static func requestAudioAuthorization(success: @escaping AuthorizedEventClosure) { |
| 91 | + switch AVCaptureDevice.authorizationStatus(for: .audio) { |
| 92 | + case .authorized: |
| 93 | + success() |
| 94 | + return |
| 95 | + |
| 96 | + case .notDetermined: |
| 97 | + AVCaptureDevice.requestAccess(for: .audio) {granted in |
| 98 | + guard granted else { return } |
| 99 | + |
| 100 | + success() |
| 101 | + } |
| 102 | + |
| 103 | + case .denied, |
| 104 | + .restricted: |
| 105 | + return |
| 106 | + |
| 107 | + @unknown default: |
| 108 | + return |
| 109 | + } |
| 110 | + } |
| 111 | + |
| 112 | + // MARK: Public Static Functions |
| 113 | + |
| 114 | + /// Check the audio & video authorization. If not determined, makes requrest for them (displaying UI). If users has authorized both video and audio, then closure is invoked. |
| 115 | + /// - Parameter success: AuthorizedEventClosure to invoke if both video and audio is authorized. |
| 116 | + public static func requestCaptureAuthorization(success: @escaping AuthorizedEventClosure) { |
| 117 | + switch AVCaptureDevice.authorizationStatus(for: .video) { |
| 118 | + case .authorized: |
| 119 | + requestAudioAuthorization(success: success) |
| 120 | + return |
| 121 | + |
| 122 | + case .notDetermined: |
| 123 | + AVCaptureDevice.requestAccess(for: .video) { granted in |
| 124 | + guard granted else { return } |
| 125 | + |
| 126 | + MSCaptureView.requestAudioAuthorization(success: success) |
| 127 | + } |
| 128 | + |
| 129 | + case .denied, |
| 130 | + .restricted: |
| 131 | + return |
| 132 | + |
| 133 | + @unknown default: |
| 134 | + return |
| 135 | + } |
| 136 | + } |
| 137 | + |
| 138 | + // MARK: Public Functions |
| 139 | + |
| 140 | + /// Set URL to output captured video to. |
| 141 | + /// |
| 142 | + /// If file already exists at this location, the file will be deleted as start of capture, not at setting the Capture URL. |
| 143 | + /// - Parameter url: URL to output. |
| 144 | + public func use(url: URL) { |
| 145 | + captureURL = url |
| 146 | + } |
| 147 | + |
| 148 | + /// Clears the capture URL (the URL used to save the captured file to). |
| 149 | + public func clearURL() { |
| 150 | + captureURL = nil |
| 151 | + } |
| 152 | + |
| 153 | + /// Attempts to turn on Preview layer on view. Return success if this occurs. |
| 154 | + /// |
| 155 | + /// The actual video may take a second or two before it appears. This call creates the majority of the internal settings. |
| 156 | + /// If the app is not authorized, or if the Preview is already turned on, this call does nothing. |
| 157 | + /// - Returns: BOOL if video is turned on, returns True. |
| 158 | + @discardableResult public func showPreview() -> Bool { |
| 159 | + guard hasCaptureAuthorization, captureSession==nil else { return true } |
| 160 | + |
| 161 | + self.wantsLayer = true |
| 162 | + |
| 163 | + let session = AVCaptureSession() |
| 164 | + session.sessionPreset = .high |
| 165 | + |
| 166 | + let layer = AVCaptureVideoPreviewLayer(session: session) |
| 167 | + |
| 168 | + guard let camera = AVCaptureDevice.default(for: AVMediaType.video), let cameraInput = try? AVCaptureDeviceInput(device: camera) else { return false } |
| 169 | + |
| 170 | + if session.canAddInput(cameraInput) { |
| 171 | + session.addInput(cameraInput) |
| 172 | + } |
| 173 | + |
| 174 | + guard let microphone = AVCaptureDevice.default(for: AVMediaType.audio), let microphoneInput = try? AVCaptureDeviceInput(device: microphone) else { return false } |
| 175 | + |
| 176 | + if session.canAddInput(microphoneInput) { |
| 177 | + session.addInput(microphoneInput) |
| 178 | + } |
| 179 | + |
| 180 | + let movieOutput = AVCaptureMovieFileOutput() |
| 181 | + if session.canAddOutput(movieOutput) { |
| 182 | + session.addOutput(movieOutput) |
| 183 | + } |
| 184 | + |
| 185 | + layer.frame = self.bounds |
| 186 | + layer.videoGravity = .resizeAspectFill |
| 187 | + self.layer = layer |
| 188 | + self.layerContentsPlacement = .scaleAxesIndependently |
| 189 | + |
| 190 | + captureSession = session |
| 191 | + capturePreviewLayer = layer |
| 192 | + captureDeviceInputCamera = cameraInput |
| 193 | + captureDeviceInputMicrophone = microphoneInput |
| 194 | + captureMovieFileOutput = movieOutput |
| 195 | + |
| 196 | + session.startRunning() |
| 197 | + |
| 198 | + return true |
| 199 | + } |
| 200 | + |
| 201 | + /// Turns off the Preview layer on view. |
| 202 | + /// |
| 203 | + /// If the app is not authorized, or if the Preview is not turned on, this call does nothing. |
| 204 | + public func hidePreview() { |
| 205 | + guard hasCaptureAuthorization, let session = captureSession, let layer = capturePreviewLayer, let cameraInput = captureDeviceInputCamera, let microphoneInput = captureDeviceInputMicrophone, let movieOutput = captureMovieFileOutput else { return } |
| 206 | + |
| 207 | + session.stopRunning() |
| 208 | + |
| 209 | + self.layer = CALayer() |
| 210 | + self.wantsLayer = true |
| 211 | + |
| 212 | + layer.session = nil |
| 213 | + |
| 214 | + if session.canAddInput(cameraInput) { |
| 215 | + session.removeInput(cameraInput) |
| 216 | + } |
| 217 | + |
| 218 | + if session.canAddInput(microphoneInput) { |
| 219 | + session.removeInput(microphoneInput) |
| 220 | + } |
| 221 | + |
| 222 | + if session.canAddOutput(movieOutput) { |
| 223 | + session.removeOutput(movieOutput) |
| 224 | + } |
| 225 | + |
| 226 | + captureSession = nil |
| 227 | + capturePreviewLayer = nil |
| 228 | + captureDeviceInputCamera = nil |
| 229 | + captureDeviceInputMicrophone = nil |
| 230 | + captureMovieFileOutput = nil |
| 231 | + } |
| 232 | + |
| 233 | + /// Starts capturing the video to the output URL. |
| 234 | + /// |
| 235 | + /// If the app is not authroized, or if the Capture URL is not set, or if the capturing is already started, this call does nothing. |
| 236 | + /// If successful, the captureRecordingStartedEvent will be invoked. |
| 237 | + /// If the file has permission issues, the captureRecordingStoppedEvent will be invoked after captureRecordingStartedEvent. |
| 238 | + /// If the Capture URL points to a file that exists, this call will delete it before starting recording. |
| 239 | + public func startCapture() { |
| 240 | + guard hasCaptureAuthorization, let url = captureURL, let output = captureMovieFileOutput else { return } |
| 241 | + |
| 242 | + do { |
| 243 | + try FileManager.default.removeItem(at: url) |
| 244 | + } |
| 245 | + catch { |
| 246 | + } |
| 247 | + |
| 248 | + output.startRecording(to: url, recordingDelegate: self) |
| 249 | + } |
| 250 | + |
| 251 | + /// Stops capturing the video to the output URL. |
| 252 | + /// |
| 253 | + /// If the app is not authroized, or if the Capture URL is not set, or if the capturing is already started, this call does nothing. |
| 254 | + /// If succesfull, the captureRecordingStoppedEvent closure will be invoked. |
| 255 | + public func stopCapture() { |
| 256 | + guard hasCaptureAuthorization, let output = captureMovieFileOutput else { return } |
| 257 | + |
| 258 | + output.stopRecording() |
| 259 | + } |
| 260 | + |
| 261 | + // MARK: Delegate Functions |
| 262 | + |
| 263 | + public func fileOutput(_ output: AVCaptureFileOutput, didStartRecordingTo: URL, from: [AVCaptureConnection]) { |
| 264 | + if let block = captureRecordingStartedEvent { |
| 265 | + block(self) |
| 266 | + } |
| 267 | + } |
| 268 | + |
| 269 | + public func fileOutput(_ output: AVCaptureFileOutput, didFinishRecordingTo outputFileURL: URL, from connections: [AVCaptureConnection], error: Error?) { |
| 270 | + if let block = captureRecordingStoppedEvent { |
| 271 | + block(self) |
| 272 | + } |
| 273 | + |
| 274 | + if let error = error { |
| 275 | + print("AV File Capture Error: \(error.localizedDescription)") |
| 276 | + } |
| 277 | + } |
| 278 | + |
3 | 279 | } |
| 280 | + |
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