CODEWITHSUNDEEP
iosswiftaudioavfoundation
Alexey Savchenko
Alexey Savchenko

Reputation: 890

Trouble with audio playback

The layout of project architecture:

record audio -> trim audio -> play trimmed audio -> upload to server.

I'm having troubles with playback of audio file that is created as a result of AVAssetExportSession trimming. I had doubts about integrity of trimmed file and I've uploaded it to server and there it plays fine, but iOS refuses to play it. I init AVAudioPlayer with URL to trimmed file, then play() and nothing happens, not even errors are thrown.

Please see code below, what can cause the problem?

  static func outputFileURL() -> URL {

    let outputFileURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!.path.appending("/audioRecord-trimmed.m4a")
    return URL(fileURLWithPath: outputFileURL)

  }


@IBAction func trimRecording(_ sender: RoundCornerButton) {

    //Delete existing recording
    deleteEditedRecording()

    //Check duration
    let duration = CMTimeGetSeconds(recordingToTrim.duration)

    if (duration < 5.0) {

      let alertController = UIAlertController(title: "Warning", message: "Sound is too short", preferredStyle: UIAlertControllerStyle.alert)

      let action = UIAlertAction(title: "OK", style: UIAlertActionStyle.cancel, handler: nil)

      alertController.addAction(action)

      self.present(alertController, animated: true, completion: nil)

      return

    } else {

      let exporter = AVAssetExportSession(asset: recordingToTrim, presetName: AVAssetExportPresetAppleM4A)

      exporter?.outputFileType = AVFileTypeAppleM4A

      exporter?.outputURL = EditorVC.outputFileURL()

      exporter?.timeRange = durationToTrim!

      exporter?.exportAsynchronously(completionHandler: {

        if exporter?.status == .completed {

          let alertController = UIAlertController(title: "Success", message: nil, preferredStyle: UIAlertControllerStyle.alert)

          let action = UIAlertAction(title: "OK", style: UIAlertActionStyle.cancel, handler: nil)

          alertController.addAction(action)

          self.present(alertController, animated: true, completion: nil)

        } else {

          let alertController = UIAlertController(title: "Error", message: exporter?.error?.localizedDescription, preferredStyle: UIAlertControllerStyle.alert)

          let action = UIAlertAction(title: "OK", style: UIAlertActionStyle.cancel, handler: nil)

          alertController.addAction(action)

          self.present(alertController, animated: true, completion: nil)

          print(exporter?.error?.localizedDescription)

          print("Export failed")

          return
        }

      })
    }

  }

@IBAction func playTrimmedAudio(_ sender: RoundCornerButton) {

    print("\nPlay tap\n")

    let player = try! AVAudioPlayer(contentsOf: EditorVC.outputFileURL())
    player.play()
 }

Upvotes: 1

Views: 97

Answers (1)

Return Zero
Return Zero

Reputation: 434

declare audio player globally like this :

var player:AVAudioPlayer!

in your playTrimmedAudio function add this two line of code 

player = try! AVAudioPlayer(contentsOf: EditorVC.outputFileURL())
player.play()

Upvotes: 1

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