Question

This is how I played a beep sound effect in iOS 4:

SystemSoundId beepOnSoundId;

CFURLRef soundUrl = CFBundleCopyResourceURL(
    CFBundleGetMainBundle(), 
    CFSTR("beep"), 
    CFSTR("wav"), 
    NULL
);

// soundUrl logged:
// file://localhost/var/mobile/Applications/ ... beep.wav

AudioServicesCreateSystemSoundID(soundUrl, &beepOnSoundId);

// beepOnSoundId logged: 4097

AudioServicesPlaySystemSound(beepOnSoundId);

It stopped working, when I upgraded my device to iOS 5. I hear nothing. I logged out all the variables and none were nil or 0.

How has the API changed in iOS 5 that breaks my sound playing code?

Update

The problem may be because I have an AVCaptureSession running while I play the sound. iOS 5 somehow doesn’t let you do this anymore. I need to play a beep sound while I am recording something from the camera.

Answer 1

This bug report could be related to your question, if you have an AVCaptureSession running.

Under iOS 5, when using an AudioServicesPlaySystemSound call, it will
not work when there is an active AVCaptureSession with an audio device
active.