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@AshvinGudaliya
Last active June 2, 2023 08:21
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Simple Audio recorder and player in swift 4
//
// AGAudioRecorder.swift
// BaseProject
//
// Created by AshvinGudaliya on 17/09/18.
// Copyright © 2018 AshvinGudaliya. All rights reserved.
//
import UIKit
import AVFoundation
enum AGAudioRecorderState {
case Pause
case Play
case Finish
case Failed(String)
case Recording
case Ready
case error(Error)
}
protocol AGAudioRecorderDelegate {
func agAudioRecorder(_ recorder: AGAudioRecorder, withStates state: AGAudioRecorderState)
func agAudioRecorder(_ recorder: AGAudioRecorder, currentTime timeInterval: TimeInterval, formattedString: String)
}
class AGAudioRecorder: NSObject {
private var isAudioRecordingGranted: Bool = false
private var filename: String = ""
private var recorderState: AGAudioRecorderState = .Ready {
willSet{
delegate?.agAudioRecorder(self, withStates: newValue)
}
}
private var audioRecorder: AVAudioRecorder! = nil
private var audioPlayer: AVAudioPlayer! = nil
private var meterTimer: Timer! = nil
private var currentTimeInterval: TimeInterval = 0.0
var delegate: AGAudioRecorderDelegate?
init(withFileName filename: String) {
super.init()
self.recorderState = .Ready
self.filename = filename
self.check_record_permission()
}
private func check_record_permission() {
switch AVAudioSession.sharedInstance().recordPermission() {
case .granted:
isAudioRecordingGranted = true
break
case .denied:
isAudioRecordingGranted = false
break
case .undetermined:
AVAudioSession.sharedInstance().requestRecordPermission({ (allowed) in
if allowed {
self.isAudioRecordingGranted = true
} else {
self.isAudioRecordingGranted = false
}
})
break
}
}
private func documentsDirectory() -> URL {
let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
let documentsDirectory = paths[0]
return documentsDirectory
}
func fileUrl() -> URL {
let filename = "\(self.filename).m4a"
let filePath = documentsDirectory().appendingPathComponent(filename)
return filePath
}
func changeFile(withFileName filename: String) {
self.filename = filename
if audioPlayer != nil {
doPause()
}
if audioRecorder != nil {
doStopRecording()
setupRecorder()
}
}
private func setupRecorder() {
if isAudioRecordingGranted {
let session = AVAudioSession.sharedInstance()
do {
try session.setCategory(AVAudioSessionCategoryPlayAndRecord, with: .defaultToSpeaker)
try session.setActive(true)
let settings = [
AVFormatIDKey: Int(kAudioFormatMPEG4AAC),
AVSampleRateKey: 44100,
AVNumberOfChannelsKey: 2,
AVEncoderAudioQualityKey:AVAudioQuality.high.rawValue
]
audioRecorder = try AVAudioRecorder(url: fileUrl(), settings: settings)
audioRecorder.delegate = self
audioRecorder.isMeteringEnabled = true
audioRecorder.prepareToRecord()
self.recorderState = .Ready
}
catch let error {
recorderState = .error(error)
}
}
else {
recorderState = .Failed("Don't have access to use your microphone.")
}
}
@objc private func updateAudioMeter(timer: Timer) {
if audioRecorder.isRecording {
currentTimeInterval = currentTimeInterval + 0.01
let hr = Int((currentTimeInterval / 60) / 60)
let min = Int(currentTimeInterval / 60)
let sec = Int(currentTimeInterval.truncatingRemainder(dividingBy: 60))
let totalTimeString = String(format: "%02d:%02d:%02d", hr, min, sec)
delegate?.agAudioRecorder(self, currentTime: currentTimeInterval, formattedString: totalTimeString)
audioRecorder.updateMeters()
}
}
private func finishAudioRecording(success: Bool) {
if success {
audioRecorder?.stop()
meterTimer?.invalidate()
recorderState = .Finish
}
else {
recorderState = .Failed("Recording failed.")
}
}
private func preparePlay() {
do {
audioPlayer = try AVAudioPlayer(contentsOf: fileUrl())
audioPlayer.delegate = self
audioPlayer.prepareToPlay()
recorderState = .Ready
}
catch {
recorderState = .error(error)
debugPrint(error)
}
}
func doRecord() {
if audioRecorder == nil {
setupRecorder()
}
if audioRecorder.isRecording {
doStopRecording()
}
else {
audioRecorder.record()
currentTimeInterval = 0.0
meterTimer = Timer.scheduledTimer(timeInterval: 0.01, target:self, selector:#selector(self.updateAudioMeter(timer:)), userInfo:nil, repeats:true)
recorderState = .Recording
}
}
func doStopRecording() {
guard audioRecorder != nil else {
return
}
audioRecorder.stop()
let audioSession = AVAudioSession.sharedInstance()
do {
try audioSession.setActive(false)
finishAudioRecording(success: true)
} catch {
recorderState = .error(error)
}
}
func doPlay() {
if audioPlayer == nil {
self.preparePlay()
}
if audioRecorder != nil, audioRecorder.isRecording {
self.doStopRecording()
}
if audioPlayer.isPlaying {
doPause()
}
else{
if FileManager.default.fileExists(atPath: fileUrl().path) {
preparePlay()
audioPlayer.play()
recorderState = .Play
}
else {
recorderState = .Failed("Audio file is missing.")
}
}
}
func doPause() {
guard audioPlayer != nil else {
return
}
if audioRecorder != nil, audioRecorder.isRecording {
self.doStopRecording()
}
if (audioPlayer.isPlaying){
audioPlayer.pause()
}
recorderState = .Pause
}
}
extension AGAudioRecorder: AVAudioRecorderDelegate, AVAudioPlayerDelegate {
func audioRecorderDidFinishRecording(_ recorder: AVAudioRecorder, successfully flag: Bool) {
if !flag {
finishAudioRecording(success: false)
}
}
func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer, successfully flag: Bool) {
}
}
@Vaishnavi0630
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pause not working

@jogasinghbajwa
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Hi, I want to get Decibel values for audio.
And i want to create Sound pressure level meter from it which goes up-to 120 and give me accurate decibel values as we get on Decibel analogue meters.

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