Write the output of the remote IO Audio Unit to a file offline

Question

I have a program that generates sound using an AUSampler connected to a Remote IO Audio Unit. AUSampler is driven by pre-recorded events that fire in a synchronized loop. I want to write the received sound to a file.

There are a few more questions about writing to a file in the I / O module render callback:

• Writing to AAC from RemoteIO: data is being recorded but the file cannot be played
• How to write AUGraph output to a file?
• Recording with RemoteIO: .caf result - step shifted slower + distorted
• Burn audio to disk from an input / output module

But all this concerns the recording of data in real time. Is there a way to offline render a file in less time than to play it?

Answer 1

If you are doing a pre-recorded sequence, then why not just write raw PCM data to disk? The ExtAudioFileWriteAsync function should work in this case.