iOS get audio duration from avplayer

Question

I'm new to ios, i have an app which contain online audio player. i need to get total duration for the audio. i have tried lot but all codes returns NaN or 0 duration. What is the best way to get total duration for the audio..?

MY CODE

NSString *songUrl = @"http://9xmusiq.com/songs2/tamil/Kaatru%20Veliyidai/Azhagiye%20%5bStarmusiq.cc%5d.mp3"

AVURLAsset *asset = [AVURLAsset assetWithURL:[NSURL URLWithString:songUrl]];
AVPlayerItem *playerItem1 = [AVPlayerItem playerItemWithAsset:asset];
AVPlayer *player1 = [AVPlayer playerWithPlayerItem:playerItem1];
AVPlayerLayer *playerLayer1 = [AVPlayerLayer playerLayerWithPlayer:player1];
playerLayer1.videoGravity = AVLayerVideoGravityResizeAspectFill;
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
    playerLayer1.frame = self.view.frame;
});

[self.view.layer insertSublayer:playerLayer1 atIndex:1];
[player1 play];
[playerItem1 addObserver:self forKeyPath:@"status" options:0 context:nil];
[playerItem1 addObserver:self forKeyPath:@"playbackBufferEmpty" options:0 context:nil];


- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context{
if ([object isKindOfClass:[AVPlayerItem class]]){
    AVPlayerItem *item = (AVPlayerItem *)object;
    if ([keyPath isEqualToString:@"status"]){
        switch(item.status){
            case AVPlayerItemStatusFailed:
                NSLog(@"player item status failed");
                break;
            case AVPlayerItemStatusReadyToPlay:
                NSLog(@"player item status is ready to play");
                Float64 duration = CMTimeGetSeconds(self.avPlayer.currentItem.duration);
                NSLog(@"Duration--> %f",duration) // NaN returns
                break;
            case AVPlayerItemStatusUnknown:
                NSLog(@"player item status is unknown");
                break;
        }
    }else if ([keyPath isEqualToString:@"playbackBufferEmpty"]){
        if (item.playbackBufferEmpty){
            NSLog(@"player item playback buffer is empty");
        }
    }
}
}

Answer 1

Thanks for your support friends, Finally i find the solution for my problem instead of using AVPlayer i used AVAudioPlayer and i fixed the problem and i got the audio duration.

NSString* resourcePath = @"http://9xmusiq.com/songs2/tamil/Kaatru%20Veliyidai/Azhagiye%20%5bStarmusiq.cc%5d.mp3"; //your url
NSData *_objectData = [NSData dataWithContentsOfURL:[NSURL URLWithString:resourcePath]];
NSError *error;

AVAudioPlayer *player1 = [[AVAudioPlayer alloc] initWithData:_objectData error:&error];
player1.numberOfLoops = 0;
player1.volume = 1.0f;
[player1 prepareToPlay];

NSLog(@"Total Duration : %f",player1.duration);

if (player1 == nil){
    NSLog(@"%@", [error description]);
}else{
    [player1 play];
}