Re: Resampling
Re: Resampling
- Subject: Re: Resampling
- From: email@hidden
- Date: Fri, 13 Mar 2009 12:10:21 -0700 (PDT)
Thanks!
So if I'm going to use AudioConverter, then will the AudioConverter
callback simply request the number of 16KHz frames it needs in order to
satisfy each call to AudioConverterFillComplexBuffer (probably
alternating between 185 and 186 16KHz frames for 512 44.1KHz frames)?
----- Original Message ----
From: Jens Alfke <email@hidden>
To: email@hidden
Cc: email@hidden
Sent: Friday, March 13, 2009 11:30:44 AM
Subject: Re: Resampling
On Mar 13, 2009, at 11:18 AM, email@hidden wrote:
> If the device has a 44.1KHz sampling rate, and I want to play 16KHz audio (a WAVE file), the number of frames from the audio file that I need to convert for each callback is not an integer (because 44100/16000 is not a whole number). How do I deal with this problem?
You should probably be letting an AudioConverter do the sample-rate conversion for you. I don't know the details; but I have been told by those who do, that the interpolation isn't as straightforward as you'd think.
Even better, use ExtAudioFile, which will do all the I/O, format decoding, and conversion to any sample rate you want.
—Jens
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