Re: Quick converter question from a CA newbie
Re: Quick converter question from a CA newbie
- Subject: Re: Quick converter question from a CA newbie
- From: William Stewart <email@hidden>
- Date: Tue, 22 Jan 2008 18:56:03 -0800
You can just create an audio converter with the input sample rate of
your source and the desired output sample rate of the AAC bitstream
(this will limit some of the bit rates you can chose).
On Jan 17, 2008, at 1:21 PM, Jaime Magiera wrote:
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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