我已经设置了我的自定义相机，并且已经编码了视频预览。我在屏幕上有一个按钮，用于在按下时捕获视频。我不知道如何去做。到目前为止，一切都已建立并正常运作。
在开始录制按钮功能中，我只需要捕获视频并保存所需的代码。谢谢
SqlSessionFactory答案 0 :(得分：1)
您可以向下滚动到“录制视频”部分，它会引导您完成代码。
以下是其中的一些内容：“
import MobileCoreServices
您还需要采用与PlayVideoViewController相同的协议，方法是在文件末尾添加以下内容：
`extension RecordVideoViewController: UIImagePickerControllerDelegate {
}
extension RecordVideoViewController: UINavigationControllerDelegate {
}
将以下代码添加到RecordVideoViewController：
`func startCameraFromViewController(viewController: UIViewController, withDelegate delegate: protocol<UIImagePickerControllerDelegate, UINavigationControllerDelegate>) -> Bool {
if UIImagePickerController.isSourceTypeAvailable(.Camera) == false {
return false
}
var cameraController = UIImagePickerController()
cameraController.sourceType = .Camera
cameraController.mediaTypes = [kUTTypeMovie as NSString as String]
cameraController.allowsEditing = false
cameraController.delegate = delegate
presentViewController(cameraController, animated: true, completion: nil)
return true
}`
此方法遵循PlayVideoViewController中的相同逻辑，但它访问.Camera而不是录制视频。 现在添加以下内容以记录（_：）：
startCameraFromViewController(self, withDelegate: self)
你又熟悉了。点击“录制视频”按钮时，代码只需调用startCameraControllerFromViewController(_:usingDelegate:)。
构建并运行以查看到目前为止您所拥有的内容。 转到“录制”屏幕，然后按“录制视频”按钮。相机UI将打开，而不是照片库。通过点击屏幕底部的红色记录按钮开始录制视频，并在录制完成后再次点击它。“
干杯， 西奥
答案 1 :(得分：0)
以下是工作代码，您需要在实际项目中正确处理optional值和error处理，但您可以使用下一个代码作为示例：
//
// ViewController.swift
// CustomCamera
//
// Created by Taras Chernyshenko on 6/27/17.
// Copyright © 2017 Taras Chernyshenko. All rights reserved.
//
import UIKit
import AVFoundation
import AssetsLibrary
class CameraViewController: UIViewController,
AVCaptureAudioDataOutputSampleBufferDelegate,
AVCaptureVideoDataOutputSampleBufferDelegate {
@IBOutlet var recordOutlet: UIButton!
@IBOutlet var recordLabel: UILabel!
@IBOutlet var cameraView: UIView!
var tempImage: UIImageView?
private var session: AVCaptureSession = AVCaptureSession()
private var deviceInput: AVCaptureDeviceInput?
private var previewLayer: AVCaptureVideoPreviewLayer?
private var videoOutput: AVCaptureVideoDataOutput = AVCaptureVideoDataOutput()
private var audioOutput: AVCaptureAudioDataOutput = AVCaptureAudioDataOutput()
private var videoDevice: AVCaptureDevice = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo)
private var audioConnection: AVCaptureConnection?
private var videoConnection: AVCaptureConnection?
private var assetWriter: AVAssetWriter?
private var audioInput: AVAssetWriterInput?
private var videoInput: AVAssetWriterInput?
private var fileManager: FileManager = FileManager()
private var recordingURL: URL?
private var isCameraRecording: Bool = false
private var isRecordingSessionStarted: Bool = false
private var recordingQueue = DispatchQueue(label: "recording.queue")
var captureSession: AVCaptureSession?
var stillImageOutput: AVCapturePhotoOutput?
var videoPreviewLayer: AVCaptureVideoPreviewLayer?
var currentCaptureDevice: AVCaptureDevice?
var usingFrontCamera = false
/* This is the function i want to use to start
recording a video */
@IBAction func recordingButton(_ sender: Any) {
if self.isCameraRecording {
self.stopRecording()
} else {
self.startRecording()
}
self.isCameraRecording = !self.isCameraRecording
}
override func viewDidLoad() {
super.viewDidLoad()
self.setup()
}
private func setup() {
self.session.sessionPreset = AVCaptureSessionPresetHigh
self.recordingURL = URL(fileURLWithPath: "\(NSTemporaryDirectory() as String)/file.mov")
if self.fileManager.isDeletableFile(atPath: self.recordingURL!.path) {
_ = try? self.fileManager.removeItem(atPath: self.recordingURL!.path)
}
self.assetWriter = try? AVAssetWriter(outputURL: self.recordingURL!,
fileType: AVFileTypeQuickTimeMovie)
let audioSettings = [
AVFormatIDKey : kAudioFormatAppleIMA4,
AVNumberOfChannelsKey : 1,
AVSampleRateKey : 16000.0
] as [String : Any]
let videoSettings = [
AVVideoCodecKey : AVVideoCodecH264,
AVVideoWidthKey : UIScreen.main.bounds.size.width,
AVVideoHeightKey : UIScreen.main.bounds.size.height
] as [String : Any]
self.videoInput = AVAssetWriterInput(mediaType: AVMediaTypeVideo,
outputSettings: videoSettings)
self.audioInput = AVAssetWriterInput(mediaType: AVMediaTypeAudio,
outputSettings: audioSettings)
self.videoInput?.expectsMediaDataInRealTime = true
self.audioInput?.expectsMediaDataInRealTime = true
if self.assetWriter!.canAdd(self.videoInput!) {
self.assetWriter?.add(self.videoInput!)
}
if self.assetWriter!.canAdd(self.audioInput!) {
self.assetWriter?.add(self.audioInput!)
}
self.deviceInput = try? AVCaptureDeviceInput(device: self.videoDevice)
if self.session.canAddInput(self.deviceInput) {
self.session.addInput(self.deviceInput)
}
self.previewLayer = AVCaptureVideoPreviewLayer(session: self.session)
self.previewLayer?.videoGravity = AVLayerVideoGravityResizeAspect
let rootLayer = self.view.layer
rootLayer.masksToBounds = true
self.previewLayer?.frame = CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height)
rootLayer.insertSublayer(self.previewLayer!, at: 0)
self.session.startRunning()
DispatchQueue.main.async {
self.session.beginConfiguration()
if self.session.canAddOutput(self.videoOutput) {
self.session.addOutput(self.videoOutput)
}
self.videoConnection = self.videoOutput.connection(withMediaType: AVMediaTypeVideo)
if self.videoConnection?.isVideoStabilizationSupported == true {
self.videoConnection?.preferredVideoStabilizationMode = .auto
}
self.session.commitConfiguration()
let audioDevice = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeAudio)
let audioIn = try? AVCaptureDeviceInput(device: audioDevice)
if self.session.canAddInput(audioIn) {
self.session.addInput(audioIn)
}
if self.session.canAddOutput(self.audioOutput) {
self.session.addOutput(self.audioOutput)
}
self.audioConnection = self.audioOutput.connection(withMediaType: AVMediaTypeAudio)
}
}
private func startRecording() {
if self.assetWriter?.startWriting() != true {
print("error: \(self.assetWriter?.error.debugDescription ?? "")")
}
self.videoOutput.setSampleBufferDelegate(self, queue: self.recordingQueue)
self.audioOutput.setSampleBufferDelegate(self, queue: self.recordingQueue)
}
private func stopRecording() {
self.videoOutput.setSampleBufferDelegate(nil, queue: nil)
self.audioOutput.setSampleBufferDelegate(nil, queue: nil)
self.assetWriter?.finishWriting {
print("saved")
}
}
func captureOutput(_ captureOutput: AVCaptureOutput!, didOutputSampleBuffer
sampleBuffer: CMSampleBuffer!, from connection: AVCaptureConnection!) {
if !self.isRecordingSessionStarted {
let presentationTime = CMSampleBufferGetPresentationTimeStamp(sampleBuffer)
self.assetWriter?.startSession(atSourceTime: presentationTime)
self.isRecordingSessionStarted = true
}
let description = CMSampleBufferGetFormatDescription(sampleBuffer)!
if CMFormatDescriptionGetMediaType(description) == kCMMediaType_Audio {
if self.audioInput!.isReadyForMoreMediaData {
print("appendSampleBuffer audio");
self.audioInput?.append(sampleBuffer)
}
} else {
if self.videoInput!.isReadyForMoreMediaData {
print("appendSampleBuffer video");
if !self.videoInput!.append(sampleBuffer) {
print("Error writing video buffer");
}
}
}
}
}