我想弄清楚如何在Swift中使用AVFoundation录制视频。我已经创建了一个自定义相机,但我只知道如何使用它拍摄静态图片,我无法弄清楚如何录制视频。根据我的理解,您必须使用AVCaptureVideoDataOutput
从录制中获取数据,但我无法弄清楚如何开始录制并实现委托方法。
整个AVFoundation编程指南/静止和视频媒体捕获是在Objective-C中,我似乎无法解读它。这是我完成这项任务的尝试:
首先我设置了相机/捕获会话
override func viewDidLoad() {
super.viewDidLoad()
captureSession.sessionPreset = AVCaptureSessionPresetHigh
let devices = AVCaptureDevice.devices()
for device in devices {
if (device.hasMediaType(AVMediaTypeVideo)) {
if(device.position == AVCaptureDevicePosition.Back) {
captureDevice = device as? AVCaptureDevice
if captureDevice != nil {
beginSession()
}
}
}
}
}
然后,一旦调用了beginSession(),我就设置了实时提要
func beginSession() {
var err : NSError? = nil
captureSession.addInput(AVCaptureDeviceInput(device: captureDevice, error: &err))
if err != nil {
println("error: \(err?.localizedDescription)")
}
previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
self.cameraView.layer.addSublayer(previewLayer)
self.cameraView.bringSubviewToFront(takePhotoButton)
self.cameraView.bringSubviewToFront(self.snappedPicture)
self.cameraView.bringSubviewToFront(self.backButton)
previewLayer?.frame = self.cameraView.layer.frame
captureSession.startRunning()
}
在这里我被困在用户按下记录以实际录制和捕捉视频的位置:
@IBAction func takeVideoAction(sender: AnyObject) {
var recordingDelegate:AVCaptureFileOutputRecordingDelegate? = self
var videoFileOutput = AVCaptureMovieFileOutput()
self.captureSession.addOutput(videoFileOutput)
let filePath = NSURL(fileURLWithPath: "filePath")
videoFileOutput.startRecordingToOutputFileURL(filePath, recordingDelegate: recordingDelegate)
}
然后我致电self.videoFileOutput.stopRecording()
。
然后是委托方法
func captureOutput(captureOutput: AVCaptureFileOutput!, didFinishRecordingToOutputFileAtURL outputFileURL: NSURL!, fromConnections connections: [AnyObject]!, error: NSError!) {
return
}
func captureOutput(captureOutput: AVCaptureFileOutput!, didStartRecordingToOutputFileAtURL fileURL: NSURL!, fromConnections connections: [AnyObject]!) {
return
}
没有任何事情可以想象,因为我无法弄清楚如何正确实现它。
答案 0 :(得分:14)
我已经尝试过您的代码了。设置有意义的filePath
时,一切都很顺利。像这样更改filePath
,您将调用委托方法:
let documentsURL = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)[0]
let filePath = documentsURL.URLByAppendingPathComponent("temp")
// Do recording and save the output to the `filePath`
videoFileOutput.startRecordingToOutputFileURL(filePath, recordingDelegate: recordingDelegate)