How can I safe audiosamples in a textfile --> Swift - swift

Question

The question is how it is possible to save audio samples of an audio file into a text file. I have the special case that I have stored the samples in an array of UnsafeMutableRawBufferPointers and now I wonder how I can put them into a text file. In C++ I would have taken a stream operator here, however I am new to Swift and am wondering how to do this.
My code so far looks like this:
let Data = Array(UnsafeMutableRawBufferPointer(start:buffer.mData, count: Int(buffer.mDataByteSize))

Answer 1

.... your buffer .....
let yourBuffer = Array(UnsafeMutableRawBufferPointer(start:buffer.mData, count: Int(buffer.mDataByteSize))
let dd = Data.withUnsafeBytes(yourBuffer)
let fileName = FileManager.default.urls(for: .downloadsDirectory, in: .userDomainMask).first!.appendingPathComponent("yourFile")
let result = try? dd.write(to: fileName)
This should create the file "yourFile" in your downloadsDirectory
Please let me know.

Answer 2

You already have code that creates an UnsafeMutableRawBufferPointer. Use that to create Data, and write that to disk:
let buffer = UnsafeRawBufferPointer(start:buffer.mData, count: Int(buffer.mDataByteSize)
let data = Data.withUnsafeBytes(buffer)
let fileURL = //the path to which you want to save
data.write(to: fileURL, options: []

Answer 3

I solved the problem by refraining from the special case of using the array of pointers. If anyone else wants to write audio samples to a text file, this is how I approached the problem via AVAudioFile:
if FileManager.default.fileExists(atPath: getFileURL().path)
{
do{
//Load Audio into Buffer and then write it down to a .txt
let file = try AVAudioFile(forReading: getFileURL())
let format = AVAudioFormat(commonFormat: .pcmFormatFloat32, sampleRate: file.fileFormat.sampleRate, channels: file.fileFormat.channelCount, interleaved: false)
guard let buf = AVAudioPCMBuffer(pcmFormat: format!, frameCapacity: AVAudioFrameCount(file.length)) else{
throw NSError()
}
try file.read(into: buf)
guard buf.floatChannelData != nil else{print("Channel Buffer was not able to be created")
throw NSError()}
let arraySize = Int(buf.frameLength)
print(arraySize, "Samples saved")
let samples = Array(UnsafeBufferPointer(start:buf.floatChannelData![0],count:arraySize))
//Array is going to be encoded and safe
let encoded = try! JSONEncoder().encode(samples)
try encoded.write(to: outputURL())
print("Textfile created.\n")
}catch {print(error)}
}else {print("AudioFile is missing")}