Swift: AVPlayer - How to get length of mp3 file from URL?

Question

I'm process to build my first IOS app in swift and i get stuck in the question: How to get length (duration) of a music file when streaming ?

I did research a lot and also write some line of codes for solve this problem but seem my code is not good enough.

 func prepareAudio() {
    audioLength = CMTimeGetSeconds(self.player.currentItem.asset.duration) 
    playerProgressSlider.maximumValue = CFloat(CMTimeGetSeconds(player.currentItem.duration))
    playerProgressSlider.minimumValue = 0.0
    playerProgressSlider.value = 0.0
    showTotalSurahLength()
} // i prepare for get the duration and apply to UISlider here

func showTotalSurahLength(){
    calculateSurahLength()
    totalLengthOfAudioLabel.text = totalLengthOfAudio
} // get the right total length of audio file


func calculateSurahLength(){
    var hour_ = abs(Int(audioLength/3600))
    var minute_ = abs(Int((audioLength/60) % 60))
    var second_ = abs(Int(audioLength % 60))

    var hour = hour_ > 9 ? "\(hour_)" : "0\(hour_)"
    var minute = minute_ > 9 ? "\(minute_)" : "0\(minute_)"
    var second = second_ > 9 ? "\(second_)" : "0\(second_)"
    totalLengthOfAudio = "\(hour):\(minute):\(second)"
} // I calculate the time and cover it

Anyone here who ever stuck with this problem, could you give me some suggests for fix it ? I'm very new in Swift and still learn to improve my skill.

Thanks,

Answer 1

For swift:

let asset = AVURLAsset(URL: NSURL(fileURLWithPath: pathString), options: nil)
let audioDuration = asset.duration
let audioDurationSeconds = CMTimeGetSeconds(audioDuration)

Answer 2

The following function works with Swift 3.0 and will return a Double value containing the duration of the target file.

func duration(for resource: String) -> Double {
    let asset = AVURLAsset(url: URL(fileURLWithPath: resource))
    return Double(CMTimeGetSeconds(asset.duration))
}

This will take the resource parameter, consisting of a String for the filepath of the audio file, and then convert the value from a Float64 to a Double.