Re: Tiger Audio Units and 96kHz
Re: Tiger Audio Units and 96kHz
- Subject: Re: Tiger Audio Units and 96kHz
- From: Jeremy Sagan <email@hidden>
- Date: Fri, 28 Oct 2005 21:04:32 -0400
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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