iOS Xode : AVAudioPlayer is not playing WAV file correctly - ios

Question

I have a WAV file with tones at around 18kHz. The audio is 16-bit PCM mono.
I am using the following function to play the file:
func playSound(name: String) {
let documents = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
let path = documents.appending("/").appending(name)
let url = NSURL.fileURL(withPath: path)
do {
player = try AVAudioPlayer(contentsOf: url)
guard let player = player else { return }
player.prepareToPlay()
player.play()
} catch let error {
print(error.localizedDescription)
}
}
When I play it on my iOS 10.2 device I hear a series of tones between 1000Hz to 10000Hz. I've analyzed the rendered audio by capturing it and a frequency plot shows that the original content at 18kHz is there, but there are also tones present between 1000Hz to 10000Hz. When I play the same WAV file with VLC or any other desktop audio player, I don't hear the tones (which is expected since they're located around 18kHz). I suspect that the code above isn't loading the data correctly or that the player isn't properly initialized, so I need a seasoned iOS veteran who can tell me what I'm doing wrong.
Thank you in advance.

Answer 1

Check the following code it might work for you
import UIKit
import AVFoundation
class ViewController: UIViewController {
var audioPlayer = AVAudioPlayer()
override func viewDidLoad() {
super.viewDidLoad()
var alertSound = NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("button-09", ofType: "wav"))
println(alertSound)
// Removed deprecated use of AVAudioSessionDelegate protocol
AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback, error: nil)
AVAudioSession.sharedInstance().setActive(true, error: nil)
var error:NSError?
audioPlayer = AVAudioPlayer(contentsOfURL: alertSound, error: &error)
audioPlayer.prepareToPlay()
audioPlayer.play()
}
}