choppy dsp (mono/stereo problem?)
From: Carl McTague (mctague_at_santafe.edu)
Date: Mon, 16 Jun 2003 00:57:10 -0400 To: email@example.com, firstname.lastname@example.org
Hi, I'm trying to use ohphone, but am having a low-level problem with
sound-in; it sounds choppy; it sounds as though a mono signal encoded
in stereo with a silent channel is being misinterpreted as a single
mono stream. For example, if the sound was abcd it plays back
a0b0c0d0 (where 0 is silence). I can reproduce the same choppyness by
(installed from the ports). But in this case, I can fix it by doing
wavrec -S test.wav
where -S "set[s] stereo mode." I get the same thing within xwave by
changing between mono and stereo record modes.
Furthermore, I if I do
cat /dev/audio > test.raw
cat test.raw > /dev/audio
I get a similar (but somewhat more severe) choppiness.
Any ideas? I'm using 4.7-RELEASE and
(carl@xi:~) cat /dev/sndstat
FreeBSD Audio Driver (newpcm)
pcm0: <Intel 82801CA (ICH3)> at io 0xd800, 0xdc80 irq 11 bufsz 16384 (1p/2r/0v channels duplex)
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