How do I call CMSampleBufferGetAudioBufferListWithRetainedBlockBuffer?

Question

I\'m trying to figure out how to call this AVFoundation function in Swift. I\'ve spent a ton of time fiddling with declarations and syntax, and got this far.

Answer 1

I do this (swift 4.2):

let n = CMSampleBufferGetNumSamples(audioBuffer)
let format = CMSampleBufferGetFormatDescription(audioBuffer)!
let asbd = CMAudioFormatDescriptionGetStreamBasicDescription(format)!.pointee

let nChannels = Int(asbd.mChannelsPerFrame) // probably 2
let bufferlistSize = AudioBufferList.sizeInBytes(maximumBuffers: nChannels)
let abl = AudioBufferList.allocate(maximumBuffers: nChannels)
for i in 0..