On Jan 17, 2008, at 2:05 PM, Jaime Magiera wrote:
Hello,
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?
Sorry, I should clarify... I edited the email for brevity and lost
some things in the translation: I do mean graduated downsampling. No
aliasing :)
Perhaps it's an assumption on my part that anyone is doing this. I
just noticed even QuickTime Player's recording feature uses the
device sampling rate for the AAC.
Is anyone doing realtime conversion for AAC?
thanks,
Jaime Magiera
Sensory Research
http://www.sensoryresearch.net
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