App's audio not working through speakers

Question

There's a weird bug in my app. I'm using AVAudioPlayer to play sounds (multiple instances of it), the sound works perfectly through headphones, but using the app without headphones produces no sound from the speaker. All of the audio clips are AAC encoded.

I have tried setting the AVAudioSession properties both through the Objective-C API ([AVAudioSession sharedInstance]) and the C API, but none of the the options seem to work.

Answer 1

ISSUE on iPhone - when sound was very low - seemed it was coming out the phone ear piece (not headphone jack) instead of bottom speaker - change to DEFAULT TO SPEAKER

//http://stackoverflow.com/questions/3104562/avaudiorecorder-avaudioplayer-sound-output-on-internal-speaker-how-to-chang


UInt32 doChangeDefaultRoute = 1;
AudioSessionSetProperty (
    kAudioSessionProperty_OverrideCategoryDefaultToSpeaker,
    sizeof (doChangeDefaultRoute),
    &doChangeDefaultRoute
);