kAudioFormatAppleIMA4 undeclared

I just updated to use XCode 4 and got the following error when running one of the previous projects:

Use of Undeclared Identifier 'kAudioFormatAppleIMA4'

The AVFoundation.framework is linked and is imported to that file.

Any ideas why开发者_StackOverflow社区 this error started to occur?

Thanks,

Sami

Have you also included the CoreAudio.framework? I believe that kAudioFormatAppleIMA4 is in there.

When you have a problem like this, check the documentation. When you search for kAudioFormatAppleIMA4 in the docs and scroll to the top of the page you fine, it says:

Core Audio Data Types Reference

Framework   
CoreAudio/CoreAudio.h
Declared in 
CoreAudioTypes.h

This means you must link to CoreAudio framework and import CoreAudio/CoreAudio.h.