118 lines
4.6 KiB
Swift
118 lines
4.6 KiB
Swift
/*
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The MIT License (MIT)
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Copyright (c) 2015-present Badoo Trading Limited.
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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import Foundation
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import Photos
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protocol LiveCameraCaptureSessionProtocol {
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var captureLayer: AVCaptureVideoPreviewLayer? { get }
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var isInitialized: Bool { get }
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var isCapturing: Bool { get }
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func startCapturing(completion: () -> Void)
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func stopCapturing(completion: () -> Void)
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}
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class LiveCameraCaptureSession: LiveCameraCaptureSessionProtocol {
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var isInitialized: Bool = false
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var isCapturing: Bool {
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return self.isInitialized && self.captureSession.running
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}
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deinit {
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var layer = self.captureLayer
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layer?.removeFromSuperlayer()
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var session: AVCaptureSession? = self.isInitialized ? self.captureSession : nil
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dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)) {
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// Analogously to AVCaptureSession creation, dealloc can take very long, so let's do it out of the main thread
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if layer != nil { layer = nil }
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if session != nil { session = nil }
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}
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}
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func startCapturing(completion: () -> Void) {
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let operation = NSBlockOperation()
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operation.addExecutionBlock { [weak operation, weak self] in
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guard let sSelf = self, strongOperation = operation where !strongOperation.cancelled else { return }
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sSelf.addInputDevicesIfNeeded()
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sSelf.captureSession.startRunning()
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dispatch_async(dispatch_get_main_queue(), completion)
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}
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self.queue.cancelAllOperations()
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self.queue.addOperation(operation)
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}
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func stopCapturing(completion: () -> Void) {
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let operation = NSBlockOperation()
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operation.addExecutionBlock { [weak operation, weak self] in
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guard let sSelf = self, strongOperation = operation where !strongOperation.cancelled else { return }
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sSelf.captureSession.stopRunning()
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sSelf.removeInputDevices()
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dispatch_async(dispatch_get_main_queue(), completion)
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}
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self.queue.cancelAllOperations()
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self.queue.addOperation(operation)
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}
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private (set) var captureLayer: AVCaptureVideoPreviewLayer?
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private lazy var queue: NSOperationQueue = {
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let queue = NSOperationQueue()
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queue.qualityOfService = .UserInitiated
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queue.maxConcurrentOperationCount = 1
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return queue
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}()
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private lazy var captureSession: AVCaptureSession = {
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assert(!NSThread.isMainThread(), "This can be very slow, make sure it happens in a background thread")
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let session = AVCaptureSession()
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self.captureLayer = AVCaptureVideoPreviewLayer(session: session)
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self.captureLayer?.videoGravity = AVLayerVideoGravityResizeAspectFill
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self.isInitialized = true
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return session
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}()
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private func addInputDevicesIfNeeded() {
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assert(!NSThread.isMainThread(), "This can be very slow, make sure it happens in a background thread")
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if self.captureSession.inputs?.count == 0 {
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let device = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)
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do {
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let input = try AVCaptureDeviceInput(device: device)
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self.captureSession.addInput(input)
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} catch {
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}
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}
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}
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private func removeInputDevices() {
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assert(!NSThread.isMainThread(), "This can be very slow, make sure it happens in a background thread")
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self.captureSession.inputs?.forEach { (input) in
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self.captureSession.removeInput(input as! AVCaptureInput)
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}
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}
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}
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