Loading & Selecting audio files into Audio Units

Question

I'm trying to build a Render Callback function that will load a variety of short sound files, and (according to my custom logic) put them in my mixer Unit's iOData audioBufferList. How do I load an aif or caf file into the program, and appropriately import its samples into the ioData?

Answer 1

See Extended Audio File Services Reference, particularly "ExtAudioFileOpenURL" and "ExtAudioFileRead". Remember not to do anything too time consuming in the render callback (e.g. opening a file may be considered time consuming, allocating memory definitely is).