AVAudioPlayer failing on Device but not simulator

Question

I am using AudioQueues to record sound (using the SpeakHere example as a jumping off point) and AVAudioPlayer to play the recorded sound. This has been working just fine in the simulator. I've just tried it on the iPhone and it is failing. There are no errors from the initWithContentsOfURL method but [avPlayer play] returns NO. No messages or error information that I can discern. Here is the code:
NSString *path = [Recording fullPathWithName:selectedRecording.filename];
NSFileManager *mgr = [NSFileManager defaultManager];
BOOL exists = [mgr fileExistsAtPath:path];
if (exists)
NSError *error;
self.avPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:&error];
NSLog([error localizedDescription]);
NSLog([error localizedFailureReason]);
if(error.code == kAudioFileUnsupportedFileTypeError)
NSLog(@"Got kAudioFileUnsupportedFileTypeError initializing AVAudioPlayer");
avLevelMeter.player = avPlayer;
avPlayer.delegate = self;
avPlayer.currentTime = selectedRecording.currentSeconds;
if ([avPlayer play])
self.state = PLAYING;
self.startTime = [NSDate dateWithTimeIntervalSinceNow:-selectedRecording.currentSeconds];
[self updateTimeDisplay];
[self startUpdateTimer];
else
[Utility showAlertWithTitle:@"Playing"
message:@"Unknown error trying to play the recording."
delegate:self
tag:0
cancelButtonTitle:@"OK"
otherButton1Title:nil
otherButton2Title:nil];
I am recording into a .wav formatted envelope. Initially I was recording in a slightly compressed format (ulaw at 11K bps) but I went back to the standard kAudioFormatLinearPCM format at 44K bps and it still refuses to play.
Any ideas?
Message was edited by: btschumy

Answer 1

SOLVED
The problem is that, the recorder sets the AudioSession Property, but doesn't set it back for playback.
add the following to to your recorder->StopRecord() function and it will then all work
UInt32 category = kAudioSessionCategory_MediaPlayback;
XThrowIfError(AudioSessionSetProperty(kAudioSessionProperty_AudioCategory, sizeof(category), &category), "couldn't set audio category!");
Barnaby