[mythtv-users] OT: Getting multi-speaker sound with intel audio

[Ma Begaj]

2007/12/23, Paul Catchpole <paul at paulcatchpole.co.uk>:
> If you've got the card working at all with ALSA under Linux, then try
> using the speaker-test program which is part of Alsa to test each
> channel whilst using the ALSA:surround51 predefined device. With some
> luck, it shouldn't need more than that.
>
> If you then want to upmix 2-channel sound to appear from all five
> speakers at once, then look at something like this in your asound.conf:
>
> pcm.fakerear {
>         type route
>         slave.pcm surround51
> slave.channels 6
> #Front left and right :
> ttable.0.0 0.9
> ttable.1.1 0.9
> #center:
> ttable.0.4 0.9
> ttable.1.4 0.9
> #Bass:
> ttable.1.5 0.5
> ttable.0.5 0.5
> #Rear Left:
> ttable.0.2 0.6
> #Rear Right:
> ttable.1.3 0.6
>
> }
>
> Hope that helps,
>
> Paul
>
> PS: The above is for an SBLive, although it should work, possibly
> needing a change to the ordering of channels to get the right speakers
> working at the right times!
>
> Marc Barrett wrote:
> >    I am using an intel motherboard with built-in audio.
> > Windoze reports it as a c-media "X-ear3D" audio controller,
> > with a CMI9739A codec. Linux lspci reports it as an intel
> > "82801EB/ER (ICH5/ICH5R) AC'97 Audio Controller."
> >
> >    Anyway, under Windoze, I can use the microphone and line-in
> > ports for additional speakers, to use up to 6 speakers at once. I
> > am wondering if this is possible under Linux.  I am not all that
> > good at setting up ALSA.
> >

There is a patch which handles this pretty good without .asound
configuration. It works for me just great:
http://svn.mythtv.org/trac/ticket/1104

M.