CVPixelBufferGetAddress返回Nil

Question

我目前正在尝试获取CVVideoPixelBuffer的baseAddress，但即使我能够看到CVVideoPixelBuffer本身不是nil，它仍然保持返回nil。

let baseAddress = CVPixelBufferGetBaseAddressOfPlane(cvPixelBuffer, 0) // -> nil =(

Answer 1

我发现原因是因为我试图从CPU访问pixelBuffer，因此需要将CVPixelBuffer的地址锁定到内存中的特定地址。

CVPixelBufferLockBaseAddress(cvPixelBuffer, CVPixelBufferLockFlags.readOnly)
let baseAddress = CVPixelBufferGetBaseAddressOfPlane(cvPixelBuffer, 0)
CVPixelBufferUnlockBaseAddress(cvPixelBuffer, CVPixelBufferLockFlags.readOnly)

这有效！