I had my application doing the exact opposite of yours, which was reading AAC audio and process it in some way. I found a 3rd party library, tested it on the Mac, Windows, and Linux and used with Qt. Plus, there are lot of applications out there which need to run on dedicated devices, so I expect libraries compatible with these devices to exist.
If the trolls add a codec, it will be one already done by a third party, that will be tested and validated. Don't expect the Qt developers to reinvent the wheel.