如何在Swift中解释从CMSampleBuffer派生的像素阵列

import CoreMedia
import CoreVideo

func getPixelArray(from sampleBuffer: CMSampleBuffer) -> Data? {
    guard let pixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer) else {
        return nil
    }
    
    let width = CVPixelBufferGetWidth(pixelBuffer)
    let height = CVPixelBufferGetHeight(pixelBuffer)
    let bytesPerRow = CVPixelBufferGetBytesPerRow(pixelBuffer)
    
    let pixelFormatType = CVPixelBufferGetPixelFormatType(pixelBuffer)
    var pixelFormat: OSType
    
    switch pixelFormatType {
    case kCVPixelFormatType_32BGRA:
        pixelFormat = kCVPixelFormatType_32BGRA
    default:
        return nil // Handle other formats if needed
    }
    
    var data = Data(count: bytesPerRow * height)
    data.withUnsafeMutableBytes { ptr in
        let baseAddress = ptr.baseAddress!
        CVPixelBufferLockBaseAddress(pixelBuffer, .readOnly)
        memcpy(baseAddress, CVPixelBufferGetBaseAddress(pixelBuffer), bytesPerRow * height)
        CVPixelBufferUnlockBaseAddress(pixelBuffer, .readOnly)
    }
    
    return data
}