Re: Sample Rate Conversion using AudioConverter
Re: Sample Rate Conversion using AudioConverter
- Subject: Re: Sample Rate Conversion using AudioConverter
- From: Tommy Braas <email@hidden>
- Date: Fri, 6 Jun 2003 12:27:14 -0700
Bill and James,
Thank you very much for your answers!
I have one more question;
Does the 'complex' part of the AudioConverterFillComplexBuffer pertain
to the buffers being complex (AudioBufferList*), or that it expects the
values to be complex? Maybe a dumb question, but since the
documentation leaves much to be desired, I feel compelled to ask.
Thanks again,
Tommy Braas
On Friday, Jun 6, 2003, at 11:31 US/Pacific, Bill Stewart wrote:
And we've fixed this in our next release - we'll be returning an error
for these invalid uses of convert buffer (something we should have
done but missed in Jaguar)
You might also look at the FillComplextBuffer version - if you are
working with audio units (the V2 variety) then this takes and returns
the data strcuture (AudioBufferList) that is used by these units...
(If you're using a V1 unit, then the FillBuffer call is the
appropriate one) - and if I'm confusing you - apologies! I'm confused
myself sometimes:-)
Bill
On Friday, June 6, 2003, at 07:28 AM, James McCartney wrote:
You should not use AudioConverterConvertBuffer when you have a sample
rate conversion. Use AudioConverterFillBuffer or
AudioConverterFillComplexBuffer.
Because in a sample rate conversion the output samples depend on
samples before and after them from the input, there is some internal
buffering that must happen which requires that you use the pull model
of these other conversion routines.
AudioConverterConvertBuffer is only for conversions where there is a
1:1 correspondence between input and output such as bit depth, endian
swap, int<->float, (de)interleaving...
On Friday, June 6, 2003, at 01:00 AM, Tommy Braas wrote:
I have been trying to figure out how to properly feed an instance of
AudioConverter using AudioConverterConvertBuffer(...).
-- --- james mccartney
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