要实现AR会话和录制视频的功能,可以使用ARKit和AVFoundation框架来完成。下面是一个示例代码,演示了如何创建AR会话并录制视频:
import ARKit
import AVFoundation
class ViewController: UIViewController, ARSessionDelegate {
var arSession: ARSession!
var recorder: AVAssetWriter!
var videoInput: AVAssetWriterInput!
var pixelBufferAdaptor: AVAssetWriterInputPixelBufferAdaptor!
var isRecording = false
override func viewDidLoad() {
super.viewDidLoad()
// 设置AR会话
arSession = ARSession()
arSession.delegate = self
// 创建视频录制器
let videoOutputSettings = [
AVVideoCodecKey: AVVideoCodecType.h264,
AVVideoWidthKey: UIScreen.main.bounds.width,
AVVideoHeightKey: UIScreen.main.bounds.height
] as [String : Any]
videoInput = AVAssetWriterInput(mediaType: .video, outputSettings: videoOutputSettings)
let pixelBufferAttributes = [
kCVPixelBufferPixelFormatTypeKey as String: kCVPixelFormatType_32ARGB,
kCVPixelBufferWidthKey as String: UIScreen.main.bounds.width,
kCVPixelBufferHeightKey as String: UIScreen.main.bounds.height
]
let adaptorAttributes = [
kCVPixelBufferPixelFormatTypeKey as String: kCVPixelFormatType_32ARGB,
kCVPixelBufferWidthKey as String: UIScreen.main.bounds.width,
kCVPixelBufferHeightKey as String: UIScreen.main.bounds.height,
kCVPixelFormatOpenGLESCompatibility as String: kCFBooleanTrue!
]
pixelBufferAdaptor = AVAssetWriterInputPixelBufferAdaptor(assetWriterInput: videoInput, sourcePixelBufferAttributes: pixelBufferAttributes, pixelBufferPool: nil, pixelBufferAttributes: adaptorAttributes)
// 创建文件路径
let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
let videoOutputFilePath = documentsPath + "/output.mp4"
let videoOutputFileURL = URL(fileURLWithPath: videoOutputFilePath)
do {
recorder = try AVAssetWriter(outputURL: videoOutputFileURL, fileType: .mp4)
} catch {
print("Failed to create AVAssetWriter: \(error)")
return
}
// 添加视频输入
if recorder.canAdd(videoInput) {
recorder.add(videoInput)
} else {
print("Failed to add video input to AVAssetWriter")
return
}
// 开始AR会话
let configuration = ARWorldTrackingConfiguration()
arSession.run(configuration)
}
// ARSessionDelegate方法:每帧渲染回调
func session(_ session: ARSession, didUpdate frame: ARFrame) {
// 判断是否正在录制
if isRecording {
// 将AR会话帧转换为CVPixelBuffer
guard let pixelBufferPool = pixelBufferAdaptor.pixelBufferPool else {
print("Failed to get pixel buffer pool")
return
}
var pixelBuffer: CVPixelBuffer?
let status = CVPixelBufferPoolCreatePixelBuffer(nil, pixelBufferPool, &pixelBuffer)
if status != kCVReturnSuccess {
print("Failed to create pixel buffer")
return
}
CVPixelBufferLockBaseAddress(pixelBuffer!, CVPixelBufferLockFlags(rawValue: 0))
let pixelData = CVPixelBufferGetBaseAddress(pixelBuffer!)
let rgbColorSpace = CGColorSpaceCreateDeviceRGB()
let context = CGContext(data: pixelData, width: Int(UIScreen.main.bounds.width), height: Int(UIScreen.main.bounds.height), bitsPerComponent: 8, bytesPerRow: CVPixelBufferGetBytesPerRow(pixelBuffer!), space: rgbColorSpace, bitmapInfo: CGImageAlphaInfo.premultipliedFirst.rawValue)
context?.translateBy(x: 0, y: UIScreen.main.bounds.height)
context?.scaleBy(x: 1.0, y: -1.0)
UIGraphicsPushContext(context!)
view.layer.render(in: context!)
UIGraphicsPopContext()
CVPixelBufferUnlockBaseAddress(pixelBuffer!, CVPixelBufferLockFlags(rawValue: 0))
// 将CVPixelBuffer添加到AVAssetWriterInputPixelBufferAdaptor中
if let pixelBuffer = pixelBuffer {
let frameTime = frame.timestamp
pixelBufferAdaptor.append(pixelBuffer, withPresentationTime: frameTime)
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