Re: Few sample rate conversion questions
Re: Few sample rate conversion questions
- Subject: Re: Few sample rate conversion questions
- From: "Mike Kluev" <email@hidden>
- Date: Wed, 21 Jan 2009 16:00:38 +0300
On Wed, 21 Jan 2009 15:51:48 +0300
"Mike Kluev" <email@hidden> wrote:
On Sun, 04 Jan 2009 23:53:40 +1100 work <email@hidden> wrote:
On Dec 24, 2008, at 7:30 PM, Mike Kluev wrote:
3) For the purposes of sample rate conversion are AUConverter
and AUVarispeed equally good? (Capable to handle the same set
of input/output rates, same quality, etc)
yes - they use the same underlying resampler
Do they use the same resampler as in AudioConverter?
With AudioConverter I can specify both complexity and quality,
to be precise, with kAudioConverterSampleRateConverterComplexity
and kAudioConverterSampleRateConverterQuality.
while with AUConverter and AUVarispeed only "quality".
... with kAudioUnitProperty_RenderQuality.
Does it correspond to the kAudioConverterSampleRateConverterQuality?
What complexity do
they use? Can I control it?
I also found that they produce initial zeroes in output frames,
while AudioConverter result doesn't have it. I attribute it to the
values of primeMethod & primeInfo that are controllable with
AudioConverter, (however I haven't figured out yet how to
actually control these values correctly with AudioConverter).
Anyway, is there a way to control prime information with
AUConverter/AUVarispeed?
Mike
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