Get stream of raw samples from audio signal using AudioToolbox - Swift

Question

I would like to record an audio signal with my iPhone and then I would like to access the samples of this signal one-by-one. I found some similar examples online but I never found an example (in Swift) to actually read and manipulate all the raw samples. How can I do that using Swift?

Answer 1

I solved my problem, I was finally able to create an array of floats where to store and manipulate the audio samples, doing the following:

   let file: AVAudioFile!
    do {
        file = try AVAudioFile(forReading: mySourceURL!)
    } catch {
        print("Error:", error)
        return
    }
    let totSamples = file.length
    let format = AVAudioFormat(commonFormat: .pcmFormatFloat32, sampleRate: file.fileFormat.sampleRate, channels: 1, interleaved: false)
    let buffer = AVAudioPCMBuffer(pcmFormat: format, frameCapacity: AVAudioFrameCount(totSamples))
    try! file.read(into: buffer)
    var floatArray = Array(UnsafeBufferPointer(start: buffer.floatChannelData?[0], count:Int(buffer.frameLength)))

where mySourceURL! is the URL of the recorded signal.