How can I generate an array of floats from an audio file in Swift

Question

I would like to load mp3 and wav audio files as arrays of floats or doubles, similar to the io.wavfile.read function in scipy. I can do this with microphone data or playing

Answer 1

AVAudioFile built-in to iOS (and OS X), is very convenient and will also do format conversions for you:

import AVFoundation
// ...

let url = NSBundle.mainBundle().URLForResource("your audio file", withExtension: "wav")
let file = try! AVAudioFile(forReading: url!)
let format = AVAudioFormat(commonFormat: .PCMFormatFloat32, sampleRate: file.fileFormat.sampleRate, channels: 1, interleaved: false)

let buf = AVAudioPCMBuffer(PCMFormat: format, frameCapacity: 1024)
try! file.readIntoBuffer(buf)

// this makes a copy, you might not want that
let floatArray = Array(UnsafeBufferPointer(start: buf.floatChannelData[0], count:Int(buf.frameLength)))

print("floatArray \(floatArray)\n")

Sadly, for doubles it doesn't seem to be enough to substitute .PCMFormatFloat32 with .PCMFormatFloat64 because AVAudioPCMBuffer doesn't have a float64ChannelData method.

update because I don't know swift well

You can avoid copying the array by working with the UnsafeBufferPointer, which is a perfectly good collection type:

let floatArray = UnsafeBufferPointer(start: buf.floatChannelData[0], count:Int(buf.frameLength))