同时录制和播放音频

Question

任何人都可以帮助我在 Iphone 中同时录制和播放音频。

Answer 1

您可以从 AVFoundation 框架中获得使用。它有 AVAudioPlayer 播放音频文件和 AVAudioRecorder 录制。 您必须记住，录音机将仅使用麦克风进行录音。 因此，同时播放音频文件和录音取决于麦克风如何感知播放的音频。

Answer 2

请查看aurioTouch苹果同时录音和播放示例代码

您也可以查看Recording Audio on an iPhone

Answer 3

要在 iOS 中录制播放音频文件，您可以使用 AVFoundation 框架。使用下面的快速代码来录制和播放音频。 请记住，录音机将使用麦克风录制音频，因此请在设备上测试此代码。

import UIKit
import AVFoundation

extension String {

       func stringByAppendingPathComponent(path: String) -> String {

       let nsSt = self as NSString
       return nsSt.stringByAppendingPathComponent(path)
    }
}

class ViewController: UIViewController, AVAudioPlayerDelegate, AVAudioRecorderDelegate{

var audioPlayer : AVAudioPlayer!
var audioRecorder : AVAudioRecorder!

@IBOutlet var recordButton : UIButton!
@IBOutlet var playButton : UIButton!
@IBOutlet var stopButton : UIButton!

override func viewDidLoad() {
    super.viewDidLoad()

    self.recordButton.enabled = true
    self.playButton.enabled = false
    self.stopButton.enabled = false
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
}

//MARK: UIButton action methods

@IBAction func playButtonClicked(sender : AnyObject){

    let dispatchQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)
    dispatch_async(dispatchQueue, {

        if let data = NSData(contentsOfFile: self.audioFilePath())
        {
            do{
                self.audioPlayer = try AVAudioPlayer(data: data)
                self.audioPlayer.delegate = self
                self.audioPlayer.prepareToPlay()
                self.audioPlayer.play()
            }
            catch{
                print("\(error)")
            }
        }
    });
}

@IBAction func stopButtonClicked(sender : AnyObject){

    if let player = self.audioPlayer{
        player.stop()
    }

    if let record = self.audioRecorder{

        record.stop()

        let session = AVAudioSession.sharedInstance()
        do{
            try session.setActive(false)
        }
        catch{
            print("\(error)")
        }
    }
}

@IBAction func recordButtonClicked(sender : AnyObject){

    let session = AVAudioSession.sharedInstance()

    do{
        try session.setCategory(AVAudioSessionCategoryPlayAndRecord)
        try session.setActive(true)
        session.requestRecordPermission({ (allowed : Bool) -> Void in

            if allowed {
                self.startRecording()
            }
            else{
                print("We don't have request permission for recording.")
            }
        })
    }
    catch{
        print("\(error)")
    }
}

func startRecording(){

    self.playButton.enabled = false
    self.recordButton.enabled = false
    self.stopButton.enabled = true

    do{

        let fileURL = NSURL(string: self.audioFilePath())!
        self.audioRecorder = try AVAudioRecorder(URL: fileURL, settings: self.audioRecorderSettings() as! [String : AnyObject])

        if let recorder = self.audioRecorder{
            recorder.delegate = self

            if recorder.record() && recorder.prepareToRecord(){
                print("Audio recording started successfully")
            }
        }
    }
    catch{
        print("\(error)")
    }
}

func audioFilePath() -> String{

    let path = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)[0]
    let filePath = path.stringByAppendingPathComponent("test.caf") as String

    return filePath
}

func audioRecorderSettings() -> NSDictionary{

    let settings = [AVFormatIDKey : NSNumber(int: Int32(kAudioFormatMPEG4AAC)), AVSampleRateKey : NSNumber(float: Float(16000.0)), AVNumberOfChannelsKey : NSNumber(int: 1), AVEncoderAudioQualityKey : NSNumber(int: Int32(AVAudioQuality.Medium.rawValue))]

    return settings
}

//MARK: AVAudioPlayerDelegate methods

func audioPlayerDidFinishPlaying(player: AVAudioPlayer, successfully flag: Bool) {

    if flag == true{
        print("Player stops playing successfully")
    }
    else{
        print("Player interrupted")
    }

    self.recordButton.enabled = true
    self.playButton.enabled = false
    self.stopButton.enabled = false
}

//MARK: AVAudioRecorderDelegate methods

func audioRecorderDidFinishRecording(recorder: AVAudioRecorder, successfully flag: Bool) {

    if flag == true{
        print("Recording stops successfully")
    }
    else{
        print("Stopping recording failed")
    }

    self.playButton.enabled = true
    self.recordButton.enabled = false
    self.stopButton.enabled = false
}
}

我在 xCode 7.0 和 iOS 9 上测试过这段代码。