digidesign CoreAudio drivers
digidesign CoreAudio drivers
- Subject: digidesign CoreAudio drivers
- From: Christopher Penrose <email@hidden>
- Date: Tue, 9 Sep 2003 19:30:43 -0400
I am having a few other problems with the Digidesign CoreAudio drivers.
I am using an mBox. *sigh*
Despite padding with a silent buffer, I receive glitches on the onset
of playback. This behavior does not occur using the same playback code
with the following interfaces., Apple built-in, EMI 2|6, Delta 1010,
and MOTU 828. It is not known to occur with others. Any advice?
Sympathy maybe?
More insidious, is that that a particular playback run is often
randomly scaled, wholesale, by a large number, somewhere in the
neighborhood of 1000. (but much less than 32768.). The result: the
playback signal is distorted beyond recognition. Once the scaling
occurs, the driver seems to continue to scale all audio samples by
roughly the same value for several different playback requests. Thus I
scaled my audio stream by 1/1000, and heard the intended result. But
sometimes the requirement for scaling disappears. It is unpredictable.
Is there some sort of explicit scaling that I need to be doing with
the CoreAudio drivers? I have never had to be concerned about scaling
with other hardware, with the exception of the Delta1010 (which was far
more consistent) and they corrected the problem in a driver update.
Christopher
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