8kHz sampling rates and i2s based ppc audio devices

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02-18-2008, 09:34 AM

Jacob Meuser

Posts: n/a

8kHz sampling rates and i2s based ppc audio devices

It's been reported that 8kHz sampling rates cause an "evil"
sound with snapper(4). 8kHz is the audio(4) default, so, just
about any operation with these devices causes the "evil" sound.

disabling 8kHz in sys/arch/macppc/dev/i2s.c avoids the "evil" sound.

however, this disables 8kHz sampling rates in all i2s based audio
devices, and I'd rather not do that if not necessary.

so, I would appreciate reports from users of aoa(4), daca(4), onyx(4)
and tumbler(4), to see if they also have the "evil" sound problem.

to set off the "evil" sound on snapper(4):

$ audioctl play.rate=8000 play.gain=100

if you have one of the above mentioned audio devices, could you
please run the above audioctl command and let me know if it
causes an "evil" sound or not. both positive and negative
feedback appreciated.

I don't have this hardware, so I'm counting on others for feedback.
if I don't hear from anyone, 8kHz sampling rates will be disabled
in i2s.c, whether it works or not. thanks.

--
jakemsr@sdf.lonestar.org
SDF Public Access UNIX System - http://sdf.lonestar.org

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8kHz sampling rates and i2s based ppc audio devices