For http://stackoverflow.com/questions/39679758/extracting-data-from-audiobufferlist-in-swift-3

audioBufferExample.swift

//: Playground - noun: a place where people can play

import AVFoundation

var bufferList = AudioBufferList(
    mNumberBuffers: 1,
    mBuffers: AudioBuffer(
        mNumberChannels: 1,
        mDataByteSize: 4,
        mData: nil))

// Pretend bufferList has been rendered. Now how do we get the samples?
let inNumberFrames = 2048

var monoSamples: [Float]!

withUnsafeMutablePointer(to: &bufferList.mBuffers.mData, {
    let p = UnsafePointer($0)
    monoSamples = [Float](UnsafeBufferPointer<Float>(start: p, count:Int(inNumberFrames)))
})

Cannot convert value of type 'UnsafePointer<UnsafeMutableRawPointer?>' to expected argument type 'UnsafePointer<_>?'