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在objective-c中,您可以轻松地将CVImageBufferRef转换为CVPixelBufferRef:

CMSampleBufferRef sampleBuffer = some value

CVPixelBufferRef pixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);

我怎么能在swift中做到这一点？

var pixelBuffer : CVPixelBufferRef = CMSampleBufferGetImageBuffer(sampleBuffer)

给出错误:'Unmanaged <CVPixelBufferRef>'不能转换为'CVPixelBufferRef'

var pixelBuffer : CVPixelBufferRef = CMSampleBufferGetImageBuffer(sampleBuffer).takeRetainedValue()

给出错误:'CVImageBuffer'不能转换为'CVPixelBufferRef'

var pixelBuffer : CVPixelBufferRef = CMSampleBufferGetImageBuffer(sampleBuffer).takeRetainedValue() as CVPixelBufferRef

给出错误:无法将表达式的类型'CVPixelBufferRef'转换为'CVPixelBufferRef'类型