How to save the position of the audio file? objective -C - ios

Question

How can I save time when audio was stopped in session and continue playback from the stop point in next session?
My code:
- (void)initPlayer:(NSString*) audioFile fileExtension:(NSString*)fileExtension
{
NSURL *audioFileLocationURL = [[NSBundle mainBundle] URLForResource:audioFile withExtension:fileExtension];
NSError *error;
self.audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:audioFileLocationURL error:&error];
if ([audioFile isEqualToString:#"2"]) {
_index = 1;
}
else if ([audioFile isEqualToString:#"3"]) {
_index = 2;
}
[self song];
}
- (void)playAudio {
[self.audioPlayer play];
}
- (void)pauseAudio {
[self.audioPlayer pause];
}
- (BOOL)isPlaying {
return [self.audioPlayer isPlaying];
}
-(NSString*)timeFormat:(float)value{
float minutes = floor(lroundf(value)/60);
float seconds = lroundf(value) - (minutes * 60);
int roundedSeconds = lroundf(seconds);
int roundedMinutes = lroundf(minutes);
NSString *time = [[NSString alloc]
initWithFormat:#"%d:%02d",
roundedMinutes, roundedSeconds];
return time;
}
- (void)setCurrentAudioTime:(float)value {
[self.audioPlayer setCurrentTime:value];
}
- (NSTimeInterval)getCurrentAudioTime {
return [self.audioPlayer currentTime];
}
- (float)getAudioDuration {
return [self.audioPlayer duration];
}

Answer 1

You can use AVPlayer's currentTime property. It returns the playback time of the current AVPlayerItem.
To restore the playback time in the next session, you can pass the stored time to AVPlayer's seekToTime:
[self.player seekToTime:storedPlaybackTime];
https://developer.apple.com/library/mac/documentation/AVFoundation/Reference/AVPlayer_Class/index.html#//apple_ref/doc/uid/TP40009530-CH1-SW2
https://developer.apple.com/library/mac/documentation/AVFoundation/Reference/AVPlayer_Class/index.html#//apple_ref/occ/instm/AVPlayer/seekToTime%3a
To persist the CMTime returned by currentTime, you can use the AVFoundation convenience methods provided by NSValue.
To wrap CMTime in an NSValue, use valueWithCMTime:
[NSValue valueWithCMTime:player.currentTime];
To get an CMTime struct from the persisted value, use:
CMTime persistedTime = [storeValue CMTimeValue];
After you wrapped the CMTime struct in a NSValue instance, you can use keyed archiver & NSData to write the time to disk.
NSHipster has a good article about that topic:http://nshipster.com/nscoding/

Answer 2

The most easy way will be to keep a local db with the song name and when it is stopped add that data to the db. Then when the playback resumes later check the local db first if it has any entries in the past. If not continue from starting.
Also make sure that there is no entry made if the song finishes.
Hope this idea helps you...