Reverse audio file in Swift using Accelerate framework (this is fast)

AudioReverse.swift

import Accelerate
import AVFoundation

func reverse(fromUrl: URL) -> URL? {
    do {
        let input = try AVAudioFile(forReading: fromUrl)
        let format = input.processingFormat
        let frameCount = AVAudioFrameCount(input.length)

        let outSettings = [AVNumberOfChannelsKey: format.channelCount,
                           AVSampleRateKey: format.sampleRate,
                           AVLinearPCMBitDepthKey: 16,
                           AVFormatIDKey: kAudioFormatMPEG4AAC] as [String: Any]

        let outputUrl = FileManager.default.temporaryDirectory.appendingPathComponent("reversed.m4a")
        try? FileManager.default.removeItem(at: outputUrl)

        let output = try AVAudioFile(forWriting: outputUrl, settings: outSettings)
        guard let buffer = AVAudioPCMBuffer(pcmFormat: format, frameCapacity: frameCount) else {
            return nil
        }

        try input.read(into: buffer)
        let frameLength = buffer.frameLength

        guard let data = buffer.floatChannelData else { return nil }

        for i in 0..<buffer.format.channelCount {
            let stride = vDSP_Stride(1)
            vDSP_vrvrs(data.advanced(by: Int(i)).pointee, stride, vDSP_Length(frameLength))
        }

        try output.write(from: buffer)
        return outputUrl
    } catch let error {
        print(error.localizedDescription)
        return nil
    }
}

how do you implement this code any help aprieshiated