CVPixelBufferUnlockBaseAddress(_:_:)
Unlocks the base address of the pixel buffer.
Declaration
func CVPixelBufferUnlockBaseAddress(_ pixelBuffer: CVPixelBuffer, _ unlockFlags: CVPixelBufferLockFlags) -> CVReturnParameters
- pixelBuffer:
The pixel buffer whose base address you want to unlock.
- unlockFlags:
The option you passed when you locked the buffer. Pass Readonly if you locked the buffer for reading only, or pass no flags if you locked it for both reading and writing.
Return Value
A Core Video result code. See Core Video Constants for possible values.
Discussion
You must call the CVPixelBufferLockBaseAddress(_:_:) function before accessing pixel data with the CPU, and call the CVPixelBufferUnlockBaseAddress(_:_:) function afterward. If you include the readOnly value in the lockFlags parameter when locking the buffer, you must also include it when unlocking the buffer. Using the flag asymmetrically results in undefined behavior.