CODEWITHSUNDEEP
iphoneobjective-cavaudioplayervolume
dubbeat
dubbeat

Reputation: 7847

avaudioplayer playback progress

Would anybody have a link to a tutorial to add a playback progress bar to AVAudioPlayer?

I've searched extensively on this site and on google to no avail

Upvotes: 11

Views: 13952

Answers (3)

Paul Nyondo
Paul Nyondo

Reputation: 2274

The CADisplayLink class, which automatically calls a method you define as soon as a screen redraw happens

Timer doesn't offer precise firing and can drift earlier or later than requested updates, and also has no idea about screen redraws and so could happily fire 10ms after a screen redraw just happened. 

let displayLink = CADisplayLink(target: self,
                                selector: #selector(update))
displayLink.add(to: .current, forMode: .common)


@objc func update() {
    let currentTime = avAudioPlayer.currentTime
    let totalTime = avAudioPlayer.duration
    let progress = currentTime / totalTime
}

Upvotes: 11

Shawon91
Shawon91

Reputation: 208

Add a periodic time observer and update the slider - in Swift it will be like this - 

   func addPlayBackSlider()
   {
    playbackSlider = UISlider(frame:CGRect(x:10, y:300, width:300, height:20))
    playbackSlider?.minimumValue = 0
    let duration : CMTime = playerItem.asset.duration
    let seconds : Float64 = CMTimeGetSeconds(duration)
    playbackSlider?.maximumValue = Float(seconds)
    playbackSlider?.isContinuous = true

    //If you want to manually set progressBar
    playbackSlider?.addTarget(self, action: #selector(AddAudioController.playbackSliderValueChanged(_:)), for: .valueChanged)

    //Here is the Observer
    player!.addPeriodicTimeObserver(forInterval: CMTimeMakeWithSeconds(1, 1), queue: DispatchQueue.main) { (CMTime) -> Void in
        if self.player!.currentItem?.status == .readyToPlay {
            let time : Float64 = CMTimeGetSeconds(self.player!.currentTime());
            self.playbackSlider!.value = Float ( time );
        }
    }
   }

   //If you want to manually set progressBar
   func playbackSliderValueChanged(_ playbackSlider:UISlider)
   {
    let seconds : Int64 = Int64(playbackSlider.value)
    targetTime = CMTimeMake(seconds, 1)
    print(targetTime)

    player!.seek(to: targetTime)

    if player!.rate == 0
    {
        player?.play()
        playButton!.setTitle("Pause", for: UIControlState.normal)
    }
}

Upvotes: 0

dubbeat
dubbeat

Reputation: 7847

I figured it out and it wasnt too bad.

Just update it in a timer

playbackTimer=[NSTimer scheduledTimerWithTimeInterval:0.5
                                     target:self 
                                                 selector:@selector(myMethod:) 
                                   userInfo:nil 
                                    repeats:YES];

}


-(void)myMethod:(NSTimer*)timer {

    float total=audioPlayer.duration;
    float f=audioPlayer.currentTime / total;

    NSString *str = [NSString stringWithFormat:@"%f", f];

    playbackProgress.progress=f;

    NSLog(str);
}

Upvotes: 19

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