I'm noticing in some code I inherited that the previous developer was
just creating a converter asbd using the device's default sampling
rate. Obviously, this is not useful for true conversion. I'm looking
to do PCM 48000 -> PCM 22050 -> AAC 22050 in real time. What is the
most efficient CoreAudio strategy for sample conversion on encoding?
Do folks generally create create two ExtendedAudioFile, using a
callback in real time to read from file A to file B? Or do it in
buffers? In general, is there an example of using two converters inline?
My concern is that the users are running the recording application at
the same time they are using various iApps. So, there's not a lot
memory resources laying around. On the other hand, they don't want to
spend the time doing post-record conversion, have concerns about file
size during and after recording? It's a balancing act.
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