1.懶加載各對象
lazy var captureSession : AVCaptureSession = {
? ? ? ? let captureSessionTmp = AVCaptureSession()
? ? ? ? if captureSessionTmp.canSetSessionPreset(AVCaptureSession.Preset.photo) {
? ? ? ? ? ? captureSessionTmp.sessionPreset = AVCaptureSession.Preset.photo
? ? ? ? }
? ? ? ? return captureSessionTmp
? ? }()
? ? // MARK: previewLayer
? ? lazy var captureVideoPreviewLayer : AVCaptureVideoPreviewLayer = {
? ? ? ? let captureVideoPreviewLayerTmp = AVCaptureVideoPreviewLayer.init(session: captureSession)
? ? ? ? captureVideoPreviewLayerTmp.videoGravity = AVLayerVideoGravity.resizeAspectFill
? ? ? ? return captureVideoPreviewLayerTmp
? ? }()
? ? // MARK: camera
? ? lazy var captureDeviceCamera : AVCaptureDevice? = {
? ? ? ? return captureDeviceInputCamera?.device
? ? }()
? ? // MARK: video input
? ? lazy var captureDeviceInputCamera : AVCaptureDeviceInput? = {
? ? ? ? let captureDevice = getCameraDeviceWithPosition(position: AVCaptureDevice.Position.back)
? ? ? ? do {
? ? ? ? ? ? let captureDeviceInputCameraTmp = try AVCaptureDeviceInput.init(device: captureDevice!)
? ? ? ? ? ? return captureDeviceInputCameraTmp
? ? ? ? }catch {
? ? ? ? }
? ? ? ? return nil
? ? }()
? ? // MARK: audio input
? ? lazy var captureDeviceInputAudio : AVCaptureDeviceInput? = {
? ? ? ? let captureDevice = AVCaptureDevice.devices(for: AVMediaType.audio).first
? ? ? ? do {
? ? ? ? ? ? let captureDeviceInputAudioTmp = try AVCaptureDeviceInput.init(device: captureDevice!)
? ? ? ? ? ? return captureDeviceInputAudioTmp
? ? ? ? }catch {
? ? ? ? }
? ? ? ? return nil
? ? }()
? ? // MARK: movie output
? ? lazy var captureMovieFileOutput : AVCaptureMovieFileOutput = {
? ? ? ? let captureMovieFileOutputTmp = AVCaptureMovieFileOutput()
? ? ? ? let captureConnection = captureMovieFileOutputTmp.connection(with: AVMediaType.video)
? ? ? ? //? ? ? ? if (captureConnection?.isVideoStabilizationSupported)! {
? ? ? ? captureConnection?.preferredVideoStabilizationMode = AVCaptureVideoStabilizationMode.auto
? ? ? ? //? ? ? ? }
? ? ? ? captureConnection?.videoOrientation = (captureVideoPreviewLayer.connection?.videoOrientation)!
? ? ? ? return captureMovieFileOutputTmp
? ? }()
2.初始化相機(jī)
if captureSession.canAddInput(captureDeviceInputCamera!) {
? ? ? ? ? ? ? ? captureSession.addInput(captureDeviceInputCamera!)
}
if captureSession.canAddInput(captureDeviceInputAudio!) {
? ? ? ? ? ? captureSession.addInput(captureDeviceInputAudio!)
}
if captureSession.canAddOutput(captureMovieFileOutput) {
? ? ? ? ? ? captureSession.addOutput(captureMovieFileOutput)
}
3.運(yùn)行session
captureSession.startRunning()
4.開始錄制視頻
if captureSession.canSetSessionPreset(AVCaptureSession.Preset.high) {
? ? ? ? ? ? captureSession.sessionPreset = AVCaptureSession.Preset.high
?}
?let videoUrl = URL.init(fileURLWithPath: MTVideoFileManager.shared.videoFilePath())
?captureMovieFileOutput.startRecording(to: videoUrl, recordingDelegate: self)
5.停止錄制視頻
captureMovieFileOutput.stopRecording()
6.停止session
captureSession.stopRunning()
7.合成視頻，并保存
func fileOutput(_ output: AVCaptureFileOutput, didFinishRecordingTo outputFileURL: URL, from connections: [AVCaptureConnection], error: Error?) {
? ? ? ? let asset = AVAsset.init(url: outputFileURL)
? ? ? ? let composition = AVMutableComposition()
? ? ? ? let videoTrack = composition.addMutableTrack(withMediaType: AVMediaType.video, preferredTrackID: kCMPersistentTrackID_Invalid)
? ? ? ? let videoAssetTrack = asset.tracks(withMediaType: AVMediaType.video).first
? ? ? ? do {
? ? ? ? ? ? try videoTrack?.insertTimeRange(CMTimeRange.init(start: kCMTimeZero, duration: (videoAssetTrack?.timeRange.duration)!), of: videoAssetTrack!, at: kCMTimeZero)
? ? ? ? ? ? let layerInstruction = AVMutableVideoCompositionLayerInstruction.init(assetTrack: videoTrack!)
? ? ? ? ? ? let totalDuration = CMTimeAdd(kCMTimeZero, (videoAssetTrack?.timeRange.duration)!)
? ? ? ? ? ? let t1 = CGAffineTransform.init(translationX: -1*(videoAssetTrack?.naturalSize.width)!/2, y: -1*(videoAssetTrack?.naturalSize.height)!/2)
? ? ? ? ? ? layerInstruction.setTransform(t1, at: kCMTimeZero)
? ? ? ? ? ? var renderSize = CGSize(width: 0, height: 0)
? ? ? ? ? ? renderSize.width = max(renderSize.width, (videoAssetTrack?.naturalSize.height)!)
? ? ? ? ? ? renderSize.height = max(renderSize.height, (videoAssetTrack?.naturalSize.width)!)
? ? ? ? ? ? let renderW = min(renderSize.width, renderSize.height)
? ? ? ? ? ? let instruction = AVMutableVideoCompositionInstruction()
? ? ? ? ? ? instruction.timeRange = CMTimeRange.init(start: kCMTimeZero, duration: totalDuration)
? ? ? ? ? ? instruction.layerInstructions = [layerInstruction]
? ? ? ? ? ? let mainComposition = AVMutableVideoComposition()
? ? ? ? ? ? mainComposition.instructions = [instruction]
? ? ? ? ? ? mainComposition.frameDuration = CMTimeMake(1, 30)
? ? ? ? ? ? mainComposition.renderSize = CGSize(width: renderW, height: renderW)
? ? ? ? ? ? let exporter = AVAssetExportSession.init(asset: composition, presetName: AVAssetExportPresetMediumQuality)
? ? ? ? ? ? exporter?.videoComposition = mainComposition
? ? ? ? ? ? exporter?.outputURL = outputFileURL
? ? ? ? ? ? exporter?.shouldOptimizeForNetworkUse = true
? ? ? ? ? ? exporter?.outputFileType = AVFileType.mov
? ? ? ? ? ? exporter?.exportAsynchronously {
? ? ? ? ? ? ? ? DispatchQueue.main.async {
? ? ? ? ? ? ? ? ? ? let lib = ALAssetsLibrary()
? ? ? ? ? ? ? ? ? ? lib.writeVideoAtPath(toSavedPhotosAlbum: outputFileURL, completionBlock: { (url, error) in
? ? ? ? ? ? ? ? ? ? ? ? if (error != nil) {
? ? ? ? ? ? ? ? ? ? ? ? ? ? print(error)
? ? ? ? ? ? ? ? ? ? ? ? ? ? self.delegate?.recordFinished(error: error as! NSError, url: nil)
? ? ? ? ? ? ? ? ? ? ? ? }else if (url != nil) {
? ? ? ? ? ? ? ? ? ? ? ? ? ? print(url)
? ? ? ? ? ? ? ? ? ? ? ? ? ? MTVideoFileManager.shared.clearFileWithUrl(url: outputFileURL)
? ? ? ? ? ? ? ? ? ? ? ? ? ? self.delegate?.recordFinished(error: nil, url: outputFileURL)
? ? ? ? ? ? ? ? ? ? ? ? }
? ? ? ? ? ? ? ? ? ? })
? ? ? ? ? ? ? ? }
? ? ? ? ? ? }
? ? ? ? } catch {
? ? ? ? ? ? print(error)
? ? ? ? }
? ? }
