CVPixelBuffer转Data，以及Data转CVPixelBuffer

CVPixelBuffer(Data).swift

func getData(from pixelBuffer: CVPixelBuffer) -> Data {
    //TODO:可以通过CVPixelBufferGetPlaneCount判断一下pixelBuffer是否有两个Plane
    
    CVPixelBufferLockBaseAddress(pixelBuffer, CVPixelBufferLockFlags(rawValue: 0))
    
    let pixelFormatType = CVPixelBufferGetPixelFormatType(pixelBuffer)
    let width = CVPixelBufferGetWidth(pixelBuffer)
    let height = CVPixelBufferGetHeight(pixelBuffer)

    var data = Data()
    let yBaseAddress = CVPixelBufferGetBaseAddressOfPlane(pixelBuffer, 0)
    let yBytesPerRow = CVPixelBufferGetBytesPerRowOfPlane(pixelBuffer, 0)
    let yLength = yBytesPerRow * height
    data.append(Data(bytes: yBaseAddress!, count: yLength))

    let cbcrBaseAddress = CVPixelBufferGetBaseAddressOfPlane(pixelBuffer, 1)
    let cbcrBytesPerRow = CVPixelBufferGetBytesPerRowOfPlane(pixelBuffer, 1)
    let cbcrLength = cbcrBytesPerRow * height / 2
    data.append(Data(bytes: cbcrBaseAddress!, count: cbcrLength))

    CVPixelBufferUnlockBaseAddress(pixelBuffer, CVPixelBufferLockFlags(rawValue: 0))
    
    return data
}

func configPixelBufferPool() -> Bool {
    let attributes: [CFString: Any] = [
        kCVPixelBufferPixelFormatTypeKey: pixelFormatType,
        kCVPixelBufferWidthKey: width,
        kCVPixelBufferHeightKey: height,
        kCVPixelBufferBytesPerRowAlignmentKey: yBytesPerRow
    ]
    let status = CVPixelBufferPoolCreate(kCFAllocatorDefault, nil, attributes as CFDictionary, &pixelBufferPool)
    return status == kCVReturnSuccess
}

func getPixelBuffer(from data: Data) -> CVPixelBuffer? {
    guard data.count == yLength + cbcrLength, 
        let pixelBufferPool = pixelBufferPool else { return nil }
    
    var _pixelBuffer: CVPixelBuffer?
    //用CVPixelBufferPoolCreatePixelBuffer创建CVPixelBuffer会更快一些
    let status = CVPixelBufferPoolCreatePixelBuffer(nil, pixelBufferPool, &_pixelBuffer)
    guard status == kCVReturnSuccess, let pixelBuffer = _pixelBuffer else {
        print("CVPixelBufferPoolCreatePixelBuffer error")
        return nil
    }
    
    //把data转换为指针，用指针进行memcpy操作，比用subdata快上百倍
    let srcPtr = data.withUnsafeBytes({ UnsafeRawPointer($0) })

    CVPixelBufferLockBaseAddress(pixelBuffer, CVPixelBufferLockFlags(rawValue: 0))
    let yBaseAddress = CVPixelBufferGetBaseAddressOfPlane(pixelBuffer, 0)
    memcpy(yBaseAddress, srcPtr, yLength)
    let cbcrBaseAddress = CVPixelBufferGetBaseAddressOfPlane(pixelBuffer, 1)
    memcpy(cbcrBaseAddress, srcPtr.advanced(by: yLength), cbcrLength)
    CVPixelBufferUnlockBaseAddress(pixelBuffer, CVPixelBufferLockFlags(rawValue: 0))

    return pixelBuffer
}

将 data 转成 CVPixelBuffer 的时候为什么还需要 CVPixelBuffer 的信息呢？这个 yLength 和 cbcrLength 你是怎么存储的，与CVPixelBuffer生成的Data绑定在一起么？

有这些信息才知道怎么把data还原成CVPixelBuffer，我写了一个struct用来存储length等信息，这些信息可以从getData中获取

谢谢回复。
我目前需要将 从Broadcast Upload Extension中获取到的CVPixelBuffer数据通过socket传递给主项目,想问下CVPixelBuffer有什么压缩的好方法么？

Broadcast Upload Extension出的图像好像是yuv420的，再压缩颜色就要失真了，转成data通过socket传给主程序就行了