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我的 CVPixelBuffer 为kCVPixelFormatType_32BGRA，我试图获取没有 Alpha 通道的 BGR 格式的帧数据。这是我尝试做的（作为extension CVPixelBuffer）

func bgrData(byteCount: Int) -> Data? {
    CVPixelBufferLockBaseAddress(self, .readOnly)
    defer { CVPixelBufferUnlockBaseAddress(self, .readOnly) }
    guard let sourceData = CVPixelBufferGetBaseAddress(self) else {
        return nil
    }
    
    let width = CVPixelBufferGetWidth(self)
    let height = CVPixelBufferGetHeight(self)
    let sourceBytesPerRow = CVPixelBufferGetBytesPerRow(self)
    let destinationBytesPerRow = 3 * width
    
    // Assign input image to `sourceBuffer` to convert it.
    var sourceBuffer = vImage_Buffer(
        data: sourceData,
        height: vImagePixelCount(height),
        width: vImagePixelCount(width),
        rowBytes: sourceBytesPerRow
    )
    
    // Make `destinationBuffer` and `destinationData` …