How to create a audioplayer application like pandora app? - iphone

Question

I am created an application which play multiple audio files from locally. Audio files are long. Audio player has following options for the user
Forward,
Rewind,
Next Track,
Previous Track,
I am planning to use AvAudioPlayer so that i can play an audio with long time. When i am changing the audio file ie pressing next track audio. The audioplayer instance is not getting released. This problem is appearing some times only. Please help me..!! I am help less..
Next Track Button IBAction Method
- (IBAction) nextTrackPressed
{
[audioPlay stopAudio];
if (audioPlay) {
audioPlay = nil;
[audioPlay release];
}
appDelegate.trackSelected += 1;
[self intiNewAudioFile];
[self play];
}
Initializing audio file through below method
-(void) intiNewAudioFile
{
NSAutoreleasePool *subPool = [[NSAutoreleasePool alloc] init];
NSString *filePath = [[NSString alloc] init];
trackObject = [appDelegate.trackDetailArray objectAtIndex:appDelegate.trackSelected];
NSLog(#"%#",trackObject.trackName);
// Get the file path to the song to play.
filePath = [[NSBundle mainBundle] pathForResource:trackObject.trackName ofType:#"mp3"];
// Convert the file path to a URL.
NSURL *fileURL = [[NSURL alloc] initFileURLWithPath:filePath];
if (audioPlay) {
audioPlay = nil;
[audioPlay release];
}
audioPlay = [[AudioPlayerClass alloc] init];
[audioPlay initAudioWithUrl:fileURL];
[filePath release];
[fileURL release];
[subPool release];
}
AudioPlayerClass Implementation
#import "AudioPlayerClass.h"
#implementation AudioPlayerClass
- (void) initAudioWithUrl: (NSURL *) url
{
curAudioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
[curAudioPlayer setDelegate:self];
[curAudioPlayer prepareToPlay];
}
- (void) playAudio
{
[curAudioPlayer play];
}
- (void) pauseAudio
{
[curAudioPlayer pause];
}
- (void) stopAudio
{
[curAudioPlayer stop];
}
- (BOOL) isAudioPlaying
{
return curAudioPlayer.playing;
}
- (void) setAudiowithCurrentTime:(NSInteger) time
{
curAudioPlayer.currentTime = time;
}
- (NSInteger) getAudioFileDuration
{
return curAudioPlayer.duration;
}
- (NSInteger) getAudioCurrentTime
{
return curAudioPlayer.currentTime;
}
- (void) releasePlayer
{
[curAudioPlayer release];
}
- (void)dealloc {
[curAudioPlayer release];
[super dealloc];
}
#end

Answer 1

Your problem is here:
if (audioPlay) {
audioPlay = nil;
[audioPlay release];
}
You are setting audioPlay to nil before calling release which means that the release message is getting sent to nil. You need to reverse the order of these 2 lines.
if (audioPlay) {
[audioPlay release];
audioPlay = nil;
}