I try to create single WAV file by portions.

Sapmles array with Floats generated by algorithm, and I can’t write as single file because too much RAM is used for Floats array.

I have not idea how to do that. Need just how I can write WAV by parts as AVAudioFile

buf is array with floats.

func saveWav(_ buf: [[Float]]) {
        if let format = AVAudioFormat(commonFormat: .pcmFormatFloat32, sampleRate: 48000, channels: 1, interleaved: false) {
            let pcmBuf = AVAudioPCMBuffer(pcmFormat: format, frameCapacity: AVAudioFrameCount(buf[0].count))
            memcpy(pcmBuf?.floatChannelData?[0], buf[0], 4 * buf[0].count)
            pcmBuf?.frameLength = UInt32(buf[0].count)

            let fileManager = FileManager.default
            do {
                let documentDirectory = try fileManager.url(for: .documentDirectory, in: .userDomainMask, appropriateFor:nil, create:false)
                try FileManager.default.createDirectory(atPath: documentDirectory.path, withIntermediateDirectories: true, attributes: nil)
                let fileURL = documentDirectory.appendingPathComponent("out0.wav")
                print(fileURL.path)
                let audioFile = try AVAudioFile(forWriting: fileURL, settings: format.settings)
                try audioFile.write(from: pcmBuf!)
                
                print("SAVE FILE DONE")
                
            } catch {
                print(error)
            }
        }