[mythtv-users] Two bttv cards - trying to access the second audio stream

[Brad Allen]

You said sound devices were missing.  Here's what I have from what
ALSA installs:

w/o DevFS:

$ for i in driver oss; do sudo emerge "alsa-${i}"; done && depmod -ae
$ f='/usr/portage/distfiles/alsa-driver-1.0.1.tar.bz2' &&
  tar jvtf "$f" |egrep snddevices
-rwxr-xr-x root/root      3524 2003-12-14 01:49:11 alsa-driver-1.0.1/snddevices.in
-rwxr-xr-x root/root      3524 2004-01-08 10:31:32 alsa-driver-1.0.1/snddevices
$ cd /tmp && d='alsa-driver-1.0.1' && x="$d/snddevices" &&
  tar jxf "$f" "$x" && sudo ./"$x" && rm -r "$d" && sudo perm && ls -l /dev/snd
total 0
crw-rw----    1 root     audio    116,   0 Dec 12 10:51 controlC0
crw-rw----    1 root     audio    116,  32 Dec 12 10:51 controlC1
crw-rw----    1 root     audio    116,  64 Dec 12 10:51 controlC2
[...]
$

I didn't actually test above; it could be wrong.  I think I might have
used ACCEPT_KEYWORDS='~x86' when doing emerge; use emerge -p
alsa-driver to test first.

$ emerge -p alsa-driver alsa-firmware \
            alsa-lib alsa-oss alsa-tools alsa-utils
and perhaps

$ sudo emerge alsa-driver alsa-firmware \
              alsa-lib alsa-oss alsa-tools alsa-utils

Not sure which ones aren't needed.

Permissions:  see attached script.  I still am doing this wrong; it
gets changed every time I log into X to be private to the user who
logged into X, which might be the behavior we want, but might not,
since we want all sorts of programs to operate correctly here and
there (mythbackend).  Further investigation of this is needed.  See
what devices get bad permissions when you log in to X.  I couldn't
find anything in q/etc/X11/xdm & /etc/X11/gdm for the script piece
that does that.

================

Then, there's settings:

mythfrontend:  Setup:  General:
[first screen]
Audio output device:  ALSA:hw:0,0
Mixer Device:  /dev/mixer  [!  This is prob. wrong; it should be ALSA:something.]
Mixer Controls:  PCM  [see above comment]

Anyway, that works, but what's the correct device for native ALSA
mixer support?  Let's see:

$ l /dev/snd/c*
crw-rw----    1 root     audio    116,  96 Dec 12 10:51 /dev/snd/controlC3
crw-rw----    1 root     audio    116,  64 Dec 12 10:51 /dev/snd/controlC2
crw-rw----    1 root     audio    116,  32 Dec 12 10:51 /dev/snd/controlC1
crw-rw----    1 root     audio    116,   0 Dec 12 10:51 /dev/snd/controlC0
$ l /dev/mixer
lrwxrwxrwx    1 root     audio          11 Dec 12 10:51 /dev/mixer -> /dev/mixer0
$ l /dev/mixer
crw-rw----    1 root     audio     14,   0 Dec 12 10:51 /dev/mixer0
$ 

I tried ALSA:hw:0.0 for Mixer Device, and that didn't work, and nor
did ALSA:mixer:0,0.  Next, I'm going to try /dev/snd/controlC0.  Nope.
Back to /dev/mixer0.  Yup, that still works.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: perm
Type: application/octet-stream
Size: 984 bytes
Desc: not available
Url : http://mythtv.org/pipermail/mythtv-users/attachments/20040125/4c8de24a/perm.obj