iOS:如何检查视频文件是使用前置摄像头还是后置摄像头录制的

import AVFoundation

func checkCameraPosition(for videoURL: URL) -> String {
    let asset = AVAsset(url: videoURL)
    let videoTracks = asset.tracks(withMediaType: .video)
    
    if let videoTrack = videoTracks.first {
        let preferredTransform = videoTrack.preferredTransform
        
        if preferredTransform.a == 0 && preferredTransform.b == 1 && preferredTransform.c == -1 && preferredTransform.d == 0 {
            return "该视频是使用前置摄像头录制的"
        } else {
            return "该视频是使用后置摄像头录制的"
        }
    }
    
    return "无法确定摄像头位置"
}

// 使用示例
let videoURL = URL(fileURLWithPath: "path_to_video_file")
let cameraPosition = checkCameraPosition(for: videoURL)
print(cameraPosition)