The simple examples (SDL, GLES, QT) should also show how audio output can be done.

[jamasi]

While the simple examples (SDL, GLES, QT) show you how to get some graphics on screen.
An app without sound is only half as useful.

Thus I suggest some simple audio playback should also be included in these examples.

[dos1]

Audio via HDMI seems to just work, at least with SDL. However, it's silent for me when I choose audio over Bluetooth, so some example would sure be handy there.