[mythtv-users] ALSA:surround51 fails with no Master

[Rodney Jay Fluharty]

Greetings,
I'm running mythtv 0.21-0.13 in Debian/unstable.

I have 2.6.18 kernel and no .asoundrc and onboard SI7012 soundcard.
I'm trying to get 5.1 out of the analog outputs.

I used ALSA:surround51 as device in xine and it works great.

Under mythtv with device as ALSA:surroun51 and mixer as ALSA:default, I
get logs like this:


-05-07 18:53:49.058 AFD: codec AC3 has 0 channels
No accelerated IMDCT transform found
2008-05-07 18:53:49.059 AFD: Opened codec 0x8ab5960, id(AC3) type(Audio)
2008-05-07 18:53:49.063 Opening audio device 'surround51'. ch 6(6) sr 48000
2008-05-07 18:53:49.064 Opening ALSA audio device 'surround51'.
2008-05-07 18:53:49.067 Mixer unable to find control Master 2
2008-05-07 18:53:49.068 Mixer unable to find control Master 3
2008-05-07 18:53:49.068 Mixer unable to find control Master 4
2008-05-07 18:53:49.068 Mixer unable to find control Master 5
2008-05-07 18:53:49.068 Mixer unable to find control Master 2
2008-05-07 18:53:49.069 Mixer unable to find control Master 3
2008-05-07 18:53:49.069 Mixer unable to find control Master 4
2008-05-07 18:53:49.069 Mixer unable to find control Master 5
2008-05-07 18:53:49.070 Mixer unable to find control Master 2
2008-05-07 18:53:49.070 Mixer unable to find control Master 3
2008-05-07 18:53:49.070 Mixer unable to find control Master 4
2008-05-07 18:53:49.070 Mixer unable to find control Master 5
2008-05-07 18:53:49.071 Mixer unable to find control Master 2
2008-05-07 18:53:49.071 Mixer unable to find control Master 3
2008-05-07 18:53:49.071 Mixer unable to find control Master 4
2008-05-07 18:53:49.071 Mixer unable to find control Master 5
2008-05-07 18:53:49.074 NVP: Enabling Audio


And no sound.  Seems it is looking for a device called Master for every
channel.  (notice 0 and 1) are not mentioned, thus I believe left and
right channels are okay, but the other 4 channels are messed up.  Should
there be a Master for each channel?  Maybe this is an aliased thing that
binds all the channels to move relative to Master???

None of the other ALSA:????? options worked.

I tried setting device to /dev/dsp and mixer to /dev/mixer to use OSS
emulation.  5.1 works like this, but volume control (though set as Master
in mythtv setup) only conrols the PCM (left and right).

I was wondering if anyone knew if I was doing something wrong?  Any help
is appreciated.

Rodney Fluharty