i've been using alsa for a while now, since around
0.90 i think, and i've continued to use it since then,
as i think it is pretty good. the installation is a
pain in the ass as many have said, but that's half the
fun. before i go onto my problem, the documentation
for my card (sound blaster live) was straightforward.
only took some pissing about with volume controls and
audio players (about 5) to get it to work. this
installation has never improved. the install scripts
are good but there needs to be some kind of *working
and thoroughly tested* setup checking/testing script
(the recent one that trys to do modules.conf didn't
work for me), instead of flying you up 90% of the
mountain to leave you with a plate full of carrots to
help you climb the rest.
ok, now down to the problem. my sound works perfectly
- no problemo, BUT everytime i use mpg321 to play an
mp3, i get this error:
Warning, unrecognized mpg123 output:"ALSA lib
pcm_hw.c:1055:(snd_pcm_hw_open) open /dev/snd/pcmC0D0p
failed: Permission denied"
there is a symlink from mpg123 to mp321. now this
happens on every version of alsa i have ever tried,
which is the whole 0.9* series and 1.0.* series. xmms
says it's using OSS driver 1.2.10 (libOSS.so) and
outputs no error. when you change it to use the alsa
driver (libALSA.so) it ouputs:
ALSA lib pcm_hw.c:1055:(snd_pcm_hw_open) open
/dev/snd/pcmC0D0p failed: Permission denied
** WARNING **: alsa_setup(): Failed to open pcm device
(default): Permission denied
and refuses to play. mpg321 outputs the error as
mentioned above but plays the song perfectly. aplay
does something similar to xmms refuses to play and
this error is outputted:
ALSA lib pcm_hw.c:1055:(snd_pcm_hw_open) open
/dev/snd/pcmC0D0p failed: Permission denied
aplay: main:502: audio open error: Permission denied
mplayer says it's using oss. i did install mpg123 at
one point to try that, but it came up with a different
error and played the song.
ok, the initial thought is it's a permissions problem
with /dev/snd/pcmC0D0p. giving full access ( chmod 777
) produces scratchy sound, in fact, damn awful sound.
with any permissions, root has that same god awful
sound because it can override the file. i've
deleted/moved the file - this just stops playback.
so really, what i want to know is : what the hell is
/dev/snd/pcmC0D0p ? pcm ? meaning my pcm volume? but i
can play sound and alter the pcm volume in alsamixer.
could it be that i've just been using the old OSS
drivers (they aren't enabled in the kernel and i
haven't installed them or called the modules), using
the pcm device for OSS instead of the alsa one
(pcmC0D0p ?), loving the sound of OSS thinking it was
alsa ? i have googled, asked, read everything to find
anything about this problem, but i can't find
anything. if i was an alsa developer with 10 years
programming experience and a phD, i could probably
figure this out, but i'm not.
Info is as follows:
Slackware-current kernel 2.4.23 i386
sound part of lsmod outputs:
Module Size Used by Tainted: PF
snd-pcm-oss 38980 1
snd-mixer-oss 13328 0 [snd-pcm-oss]
snd-emu10k1 74852 1
snd-pcm 61604 0 [snd-pcm-oss
snd-emu10k1]
snd-timer 14852 0 [snd-pcm]
snd-util-mem 1392 0 [snd-emu10k1]
snd-hwdep 5312 0 [snd-emu10k1]
snd-rawmidi 14048 0 [snd-emu10k1]
snd-ac97-codec 47468 0 [snd-emu10k1]
snd-seq-device 4400 0 [snd-emu10k1
snd-rawmidi]
snd 31844 0 [snd-pcm-oss
snd-mixer-oss snd-emu10k1 snd-pcm snd-timer
snd-util-mem snd-hwdep snd-rawmidi snd-ac97-codec
snd-seq-device]
soundcore 3844 6 [snd]
snd-page-alloc 6516 0 [snd-emu10k1
snd-pcm]
sound card : Creative Soundblaster Live!
if i get an answer from this list which tells me
exactly what is going on, i will be damn surprised.
Adam
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