Re: Tiger Audio Units and 96kHz
Re: Tiger Audio Units and 96kHz
- Subject: Re: Tiger Audio Units and 96kHz
- From: Chris Rogers <email@hidden>
- Date: Fri, 28 Oct 2005 18:11:45 -0700
Jeremy,
We tested these AUs at different sample-rates including 96KHz.
Please try this test with "AU Lab" with your hardware device set to
96KHz.
Chris Rogers
Core Audio
Apple Computer
On Oct 28, 2005, at 6:04 PM, Jeremy Sagan wrote:
Hello,
After further analysis I am leaning toward this problem being
within these audio units. I tried to reproduce this with AudioUnit
hosting and could not BUT audiounit hosting does not seem to be
setting the destination sample rate to 96kHz even though the
default system output device is set to 96kHz. Information appears
in the console and it shows that while the file is 96k the
destination output is still being configured to a sample rate of
44.1kHz.
Also my own independent testing has discovered some interesting
phenomena. First at 96kHz in my code, if I load AUTImePitch it will
work if the quality setting is low or medium. As soon as the
quality is set higher, the plug-in calls my input procedure but
asks for only 366 (or so) samples during each V2Render and the
audio packet buffer size being rendered is 1024 and the AUTimePitch
rate is 1.0. This means that the component is not asking for enough
data so there is no way it could render properly. The resultant
audio is a very slowed down version of the original and my
presumption is that this is a result of a mathematical overflow
type error.
The AUVarispeed does not render properly at high sample rates
regardless of the quality setting which, as far as I can tell, has
no affect on the sound.
AUPitch, which is not a format converter plugin, exhibits a
different problem at high sample rates but may be related. It
introduces static into the audio signal.
I am still open to the problem being in my code (especially since
this code to deal with format converter AU's is new) but the fact
that many other plug-ins render fine at 96k and that the
AUTimePitch renders okay if the quality is low seems to indicate
the problem lies within the Apple AU's.
On Oct 28, 2005, at 3:23 PM, Jeremy Sagan wrote:
Has anyone tried to get the Varispeed unit, the TimePitch unit and
the Pitch Unit to work with a 96kHz sample rate?
I cannot get them to work. The problem with the format converters
may be in my code so I was wondering if anybody has used these
with 96kHz audio files?
Thanks,
Jeremy
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