Apple

ExtAudioFileCreateNew()

to open the file, passing the in an AudioStreamBasicDescription that describes the data you wanted written to the file, and then you before writing any data you can call

err = ExtAudioFileSetProperty(outputFile, kExtAudioFileProperty_ClientDataFormat, sizeof(AudioStreamBasicDescription), &outAsbd);

passing in a different AudioStreamBasicDescription telling it what kind of data you are going to provide it with, and then it would handle the conversion when you wrote the data. However, if I use different AudioStreamBasicDescriptions for these two calls, I always get a fmt? error with the ExtAudioFileSetProperty call, but I can get it to work if I use the same ABSD. I'm guessing my understanding must be wrong and I need to do the conversion myself?

If so, is there a way to asychronously apply multiple Audio Units to raw data held in a buffer (not coming in AudioBufferList *s? I'm trying to take the raw data saved earlier from the selected device input and write it to an AIFF file, and I keep either getting errors or else files that are just filled with static. I've tried to piece together what the sample code projects do and have been searching the documentation, but for some reason I'm having trouble forming a gestalt of how this all works. Anyone who could provide some guidance, it would be greatly appreciated.

Thanks,

Jeff