如何使用 Swift 4 从 CMSampleBuffer 创建数据

Question

We can convert CMSampleBuffer to NSData with following function. But we could not find a way to convert it to Data.

We tried using

   Data(bytes: <#T##UnsafeRawPointer#>, count: <#T##Int#>)

instead of

   NSData(bytes: <#T##UnsafeRawPointer?#>, length: <#T##Int#>)

but no luck. Is there anyone who could do it.

func frameData() -> NSData {

        let imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer)

        CVPixelBufferLockBaseAddress(imageBuffer!, CVPixelBufferLockFlags(rawValue: 0))

        let bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer!)
        let height = CVPixelBufferGetHeight(imageBuffer!)
        let src_buff = CVPixelBufferGetBaseAddress(imageBuffer!)
        let nsdata = NSData(bytes: src_buff, length: bytesPerRow * height)

        CVPixelBufferUnlockBaseAddress(imageBuffer!, CVPixelBufferLockFlags(rawValue: 0))


        return nsdata

    }

Answer 1

Just used

       let data = Data(bytes: src_buff!, count: bytesPerRow * height)

instead of

     let nsdata = NSData(bytes: src_buff, length: bytesPerRow * height)  

The key is here was ! after src_buff for Data. Because xCode was showing some errors which is not related ! usage I could not understand ! was needed.