在Swift中录制音频

Question

有谁知道我在哪里可以找到有关如何在Swift应用程序中录制音频的信息？我一直在看一些音频播放的例子，但我似乎无法找到任何有关实施音频录制的内容。由于

Answer 1

这里是code.You可以记录IBAction。它easily.Write该代码将名称保存记录在DocumentsrecordTest.caf

//declare instance variable 
var audioRecorder:AVAudioRecorder! 
func record(){   
    var audioSession:AVAudioSession = AVAudioSession.sharedInstance() 
    audioSession.setCategory(AVAudioSessionCategoryPlayAndRecord, error: nil) 
    audioSession.setActive(true, error: nil) 

    var documents: AnyObject = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)[0] 
    var str = documents.stringByAppendingPathComponent("recordTest.caf") 
    var url = NSURL.fileURLWithPath(str as String) 

    var recordSettings = [AVFormatIDKey:kAudioFormatAppleIMA4, 
     AVSampleRateKey:44100.0, 
     AVNumberOfChannelsKey:2,AVEncoderBitRateKey:12800, 
     AVLinearPCMBitDepthKey:16, 
     AVEncoderAudioQualityKey:AVAudioQuality.Max.rawValue] 

    println("url : \(url)") 
    var error: NSError? 

    audioRecorder = AVAudioRecorder(URL:url, settings: recordSettings, error: &error) 
    if let e = error { 
     println(e.localizedDescription) 
    } else { 
     audioRecorder.record() 
    }   
} 

Answer 2

@ codester的回答Swift2版本。

func record() { 
    //init 
    let audioSession:AVAudioSession = AVAudioSession.sharedInstance() 

    //ask for permission 
    if (audioSession.respondsToSelector("requestRecordPermission:")) { 
     AVAudioSession.sharedInstance().requestRecordPermission({(granted: Bool)-> Void in 
      if granted { 
       print("granted") 

       //set category and activate recorder session 
       try! audioSession.setCategory(AVAudioSessionCategoryPlayAndRecord) 
       try! audioSession.setActive(true) 


       //get documnets directory 
       let documentsDirectory = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0] 
       let fullPath = documentsDirectory.stringByAppendingPathComponent("voiceRecording.caf") 
       let url = NSURL.fileURLWithPath(fullPath) 

       //create AnyObject of settings 
       let settings: [String : AnyObject] = [ 
        AVFormatIDKey:Int(kAudioFormatAppleIMA4), //Int required in Swift2 
        AVSampleRateKey:44100.0, 
        AVNumberOfChannelsKey:2, 
        AVEncoderBitRateKey:12800, 
        AVLinearPCMBitDepthKey:16, 
        AVEncoderAudioQualityKey:AVAudioQuality.Max.rawValue 
       ] 

       //record 
       try! self.audioRecorder = AVAudioRecorder(URL: url, settings: settings) 

      } else{ 
       print("not granted") 
      } 
     }) 
    } 

} 

Answer 3

除了以前的答案，我试图使它在7.2的Xcode工作后，我听不到任何声音，没有当我通过电子邮件发送的文件。没有警告或例外。 因此，我将设置更改为以下内容并存储为.m4a文件。

let recordSettings = [AVSampleRateKey : NSNumber(float: Float(44100.0)), 
    AVFormatIDKey : NSNumber(int: Int32(kAudioFormatMPEG4AAC)), 
    AVNumberOfChannelsKey : NSNumber(int: 1), 
    AVEncoderAudioQualityKey : NSNumber(int: Int32(AVAudioQuality.Medium.rawValue))] 

之后，我可以听声音。 保存文件，我添加了这个在viewDidLoad中初始化记录：

let audioSession = AVAudioSession.sharedInstance() 
    do { 
     try audioSession.setCategory(AVAudioSessionCategoryPlayAndRecord) 
     try audioRecorder = AVAudioRecorder(URL: self.directoryURL()!, 
      settings: recordSettings) 
     audioRecorder.prepareToRecord() 
    } catch { 
    } 

和创建目录：

func directoryURL() -> NSURL? { 
    let fileManager = NSFileManager.defaultManager() 
    let urls = fileManager.URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask) 
    let documentDirectory = urls[0] as NSURL 
    let soundURL = documentDirectory.URLByAppendingPathComponent("sound.m4a") 
    return soundURL 
} 

我还添加用于启动记录的行动，停止和播放

后

@IBAction func doRecordAction(sender: AnyObject) { 
    if !audioRecorder.recording { 
     let audioSession = AVAudioSession.sharedInstance() 
     do { 
      try audioSession.setActive(true) 
      audioRecorder.record() 
     } catch { 
     } 
    } 
} 
@IBAction func doStopRecordingAction(sender: AnyObject) { 
    audioRecorder.stop() 
    let audioSession = AVAudioSession.sharedInstance() 

    do { 
     try audioSession.setActive(false) 
    } catch { 
    } 
} 

@IBAction func doPlayAction(sender: AnyObject) { 
    if (!audioRecorder.recording){ 
     do { 
      try audioPlayer = AVAudioPlayer(contentsOfURL: audioRecorder.url) 
      audioPlayer.play() 
     } catch { 
     } 
    } 
} 

Answer 4

斯威夫特3代码版本：录音完整的解决方案！

import UIKit 
import AVFoundation 

class ViewController: UIViewController, AVAudioRecorderDelegate { 

    //Outlets 
    @IBOutlet weak var recordingTimeLabel: UILabel! 

    //Variables 
    var audioRecorder: AVAudioRecorder! 
    var meterTimer:Timer! 
    var isAudioRecordingGranted: Bool! 


    override func viewDidLoad() { 
     super.viewDidLoad() 

     switch AVAudioSession.sharedInstance().recordPermission() { 
     case AVAudioSessionRecordPermission.granted: 
      isAudioRecordingGranted = true 
      break 
     case AVAudioSessionRecordPermission.denied: 
      isAudioRecordingGranted = false 
      break 
     case AVAudioSessionRecordPermission.undetermined: 
      AVAudioSession.sharedInstance().requestRecordPermission() { [unowned self] allowed in 
       DispatchQueue.main.async { 
        if allowed { 
         self.isAudioRecordingGranted = true 
        } else { 
         self.isAudioRecordingGranted = false 
        } 
       } 
      } 
      break 
     default: 
      break 
     } 
    } 

    override func didReceiveMemoryWarning() { 
     super.didReceiveMemoryWarning() 

     audioRecorder = nil 
    } 

    //MARK:- Audio recorder buttons action. 
    @IBAction func audioRecorderAction(_ sender: UIButton) { 

     if isAudioRecordingGranted { 

      //Create the session. 
      let session = AVAudioSession.sharedInstance() 

      do { 
       //Configure the session for recording and playback. 
       try session.setCategory(AVAudioSessionCategoryPlayAndRecord, with: .defaultToSpeaker) 
       try session.setActive(true) 
       //Set up a high-quality recording session. 
       let settings = [ 
        AVFormatIDKey: Int(kAudioFormatMPEG4AAC), 
        AVSampleRateKey: 44100, 
        AVNumberOfChannelsKey: 2, 
        AVEncoderAudioQualityKey: AVAudioQuality.high.rawValue 
       ] 
       //Create audio file name URL 
       let audioFilename = getDocumentsDirectory().appendingPathComponent("audioRecording.m4a") 
       //Create the audio recording, and assign ourselves as the delegate 
       audioRecorder = try AVAudioRecorder(url: audioFilename, settings: settings) 
       audioRecorder.delegate = self 
       audioRecorder.isMeteringEnabled = true 
       audioRecorder.record() 
       meterTimer = Timer.scheduledTimer(timeInterval: 0.1, target:self, selector:#selector(self.updateAudioMeter(timer:)), userInfo:nil, repeats:true) 
      } 
      catch let error { 
       print("Error for start audio recording: \(error.localizedDescription)") 
      } 
     } 
    } 

    @IBAction func stopAudioRecordingAction(_ sender: UIButton) { 

     finishAudioRecording(success: true) 

    } 

    func finishAudioRecording(success: Bool) { 

     audioRecorder.stop() 
     audioRecorder = nil 
     meterTimer.invalidate() 

     if success { 
      print("Recording finished successfully.") 
     } else { 
      print("Recording failed :(") 
     } 
    } 

    func updateAudioMeter(timer: Timer) { 

     if audioRecorder.isRecording { 
      let hr = Int((audioRecorder.currentTime/60)/60) 
      let min = Int(audioRecorder.currentTime/60) 
      let sec = Int(audioRecorder.currentTime.truncatingRemainder(dividingBy: 60)) 
      let totalTimeString = String(format: "%02d:%02d:%02d", hr, min, sec) 
      recordingTimeLabel.text = totalTimeString 
      audioRecorder.updateMeters() 
     } 
    } 

    func getDocumentsDirectory() -> URL { 

     let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask) 
     let documentsDirectory = paths[0] 
     return documentsDirectory 
    } 

    //MARK:- Audio recoder delegate methods 
    func audioRecorderDidFinishRecording(_ recorder: AVAudioRecorder, successfully flag: Bool) { 

     if !flag { 
      finishAudioRecording(success: false) 
     } 
    } 
} 

Answer 5

在斯威夫特3

• 添加框架AVFoundation
• 在信息。plist中添加键值：隐私 - 麦克风的使用说明和值：对于使用麦克风（该应用程序会崩溃，如果你不提供的价值 - 说明为什么你所要求的权限）

• 进口AVFoundation & AVAudioRecorderDelegate，AVAudioPlayerDelegate

  import AVFoundation 
  
  class RecordVC: UIViewController , AVAudioRecorderDelegate, AVAudioPlayerDelegate 
  

• 备案音频&播放音频和标签显示录音时间&给予网点和start_recording行动的创建按钮，play_recording &声明一些变量，我们将在后面使用

  @IBOutlet var recordingTimeLabel: UILabel! 
  @IBOutlet var record_btn_ref: UIButton! 
  @IBOutlet var play_btn_ref: UIButton! 
  
  var audioRecorder: AVAudioRecorder! 
  var audioPlayer : AVAudioPlayer! 
  var meterTimer:Timer! 
  var isAudioRecordingGranted: Bool! 
  var isRecording = false 
  var isPlaying = false 
  

• 在viewDidLoad中检查记录许可

  override func viewDidLoad() { 
      super.viewDidLoad() 
      check_record_permission() 
  } 
  
  func check_record_permission() 
  { 
      switch AVAudioSession.sharedInstance().recordPermission() { 
      case AVAudioSessionRecordPermission.granted: 
       isAudioRecordingGranted = true 
       break 
      case AVAudioSessionRecordPermission.denied: 
       isAudioRecordingGranted = false 
       break 
      case AVAudioSessionRecordPermission.undetermined: 
       AVAudioSession.sharedInstance().requestRecordPermission() { [unowned self] allowed in 
       DispatchQueue.main.async { 
        if allowed { 
         self.isAudioRecordingGranted = true 
        } else { 
         self.isAudioRecordingGranted = false 
        } 
       } 
      } 
      break 
      default: 
       break 
      } 
  } 
  

• 生成路径磨片再次要将该记录保存为myRecording.m4a

  func getDocumentsDirectory() -> URL 
  { 
      let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask) 
      let documentsDirectory = paths[0] 
      return documentsDirectory 
  } 
  
  func getFileUrl() -> URL 
  { 
      let filename = "myRecording.m4a" 
      let filePath = getDocumentsDirectory().appendingPathComponent(filename) 
  return filePath 
  } 
  

• 设置记录

  func setup_recorder() 
  { 
      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: getFileUrl(), settings: settings) 
        audioRecorder.delegate = self 
        audioRecorder.isMeteringEnabled = true 
        audioRecorder.prepareToRecord() 
       } 
       catch let error { 
        display_alert(msg_title: "Error", msg_desc: error.localizedDescription, action_title: "OK") 
       } 
      } 
      else 
      { 
       display_alert(msg_title: "Error", msg_desc: "Don't have access to use your microphone.", action_title: "OK") 
      } 
  } 
  

• 开始录音时使用updateAudioMeter，&按钮start_recording按&显示秒，如果录音开始然后完成录制

  @IBAction func start_recording(_ sender: UIButton) 
  { 
      if(isRecording) 
      { 
       finishAudioRecording(success: true) 
       record_btn_ref.setTitle("Record", for: .normal) 
       play_btn_ref.isEnabled = true 
       isRecording = false 
      } 
      else 
      { 
       setup_recorder() 
  
       audioRecorder.record() 
       meterTimer = Timer.scheduledTimer(timeInterval: 0.1, target:self, selector:#selector(self.updateAudioMeter(timer:)), userInfo:nil, repeats:true) 
       record_btn_ref.setTitle("Stop", for: .normal) 
       play_btn_ref.isEnabled = false 
       isRecording = true 
      } 
  } 
  
  func updateAudioMeter(timer: Timer) 
  { 
      if audioRecorder.isRecording 
      { 
       let hr = Int((audioRecorder.currentTime/60)/60) 
       let min = Int(audioRecorder.currentTime/60) 
       let sec = Int(audioRecorder.currentTime.truncatingRemainder(dividingBy: 60)) 
       let totalTimeString = String(format: "%02d:%02d:%02d", hr, min, sec) 
       recordingTimeLabel.text = totalTimeString 
       audioRecorder.updateMeters() 
      } 
  } 
  
  func finishAudioRecording(success: Bool) 
  { 
      if success 
      { 
       audioRecorder.stop() 
       audioRecorder = nil 
       meterTimer.invalidate() 
       print("recorded successfully.") 
      } 
      else 
      { 
       display_alert(msg_title: "Error", msg_desc: "Recording failed.", action_title: "OK") 
      } 
  } 
  

• 播放录音

  func prepare_play() 
  { 
      do 
      { 
       audioPlayer = try AVAudioPlayer(contentsOf: getFileUrl()) 
       audioPlayer.delegate = self 
       audioPlayer.prepareToPlay() 
      } 
      catch{ 
       print("Error") 
      } 
  } 
  
  @IBAction func play_recording(_ sender: Any) 
  { 
      if(isPlaying) 
      { 
       audioPlayer.stop() 
       record_btn_ref.isEnabled = true 
       play_btn_ref.setTitle("Play", for: .normal) 
       isPlaying = false 
      } 
      else 
      { 
       if FileManager.default.fileExists(atPath: getFileUrl().path) 
       { 
        record_btn_ref.isEnabled = false 
        play_btn_ref.setTitle("pause", for: .normal) 
        prepare_play() 
        audioPlayer.play() 
        isPlaying = true 
       } 
       else 
       { 
        display_alert(msg_title: "Error", msg_desc: "Audio file is missing.", action_title: "OK") 
       } 
      } 
  } 
  

• 当录制完成启用播放按钮&当该剧完成启用录制按钮

  func audioRecorderDidFinishRecording(_ recorder: AVAudioRecorder, successfully flag: Bool) 
  { 
      if !flag 
      { 
       finishAudioRecording(success: false) 
      } 
      play_btn_ref.isEnabled = true 
  } 
  
  func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer, successfully flag: Bool) 
  { 
      record_btn_ref.isEnabled = true 
  } 
  

• 显示期广义函数警报

  func display_alert(msg_title : String , msg_desc : String ,action_title : String) 
  { 
      let ac = UIAlertController(title: msg_title, message: msg_desc, preferredStyle: .alert) 
      ac.addAction(UIAlertAction(title: action_title, style: .default) 
      { 
       (result : UIAlertAction) -> Void in 
      _ = self.navigationController?.popViewController(animated: true) 
      }) 
      present(ac, animated: true) 
  }