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

Above answers didn't work for me, I'm using Swift5, found this extensions that worked for me here: https://gist.github.com/jtodaone/f2fa59c19794811dbe989dff65a772bc

Also here is how i use the code on Playground

import UIKit
import AVFoundation

let filePath: String = Bundle.main.path(forResource: "nameOfFile", ofType: "wav")!
print("\(filePath)")
let fileURL: NSURL = NSURL(fileURLWithPath: filePath)
let audioFile = try AVAudioFile(forReading: fileURL as URL)
let audioFormat = audioFile.processingFormat
let audioFrameCount = UInt32(audioFile.length)
let audioFileBuffer = AVAudioPCMBuffer(pcmFormat: audioFormat, frameCapacity: audioFrameCount)

try audioFile.read(into: audioFileBuffer!)

extension AudioBuffer {
    func array() -> [Float] {
        return Array(UnsafeBufferPointer(self))
    }
}

extension AVAudioPCMBuffer {
    func array() -> [Float] {
        return self.audioBufferList.pointee.mBuffers.array()
    }
}

extension Array where Element: FloatingPoint {
    mutating func buffer() -> AudioBuffer {
        return AudioBuffer(mNumberChannels: 1, mDataByteSize: UInt32(self.count * MemoryLayout.size), mData: &self)
    }
}

let array = audioFileBuffer?.array()
print(array?.count) //Optional(2705408)