[mythtv-users] ALSA and real AC3 passthrough
Petr Stehlik
pstehlik at sophics.cz
Thu Dec 29 13:11:32 EST 2005
Lee Koloszyc píše v Čt 29. 12. 2005 v 09:12 -0500:
> > My question is whether it's possible to set up the .asoundrc in a way
> > that it handles both DVB-S AC3 real passthrough and also analog->digital
> > conversion plus 32kHz->48kHz resampling.
> In the .asoundrc I found on the web there is an Alsa section called dmix
it's called dmix-digital in the Digital Sound HowTo.
> (digital mix) which will convert the analog sound to the proper format
> for sending out through the spdif.
But does it allow for AC3 passthrough at the same time? Do you have some
AC3 sound source? Have you tried say HD DVB-S or perhaps DVD replayed
via the internal Myth DVD player (I guess that one would use the AC3
passthrough but I use xine so I don't know).
> pcm.nforce { type dmix ipc_key 1234 slave { pcm "hw:0,1" period_time 0
> period_size 1024 buffer_size 4096 rate 44100 } }
I have a very similar section there.
> This may help, it is for gentoo, but you should get the general idea:
> http://gentoo-wiki.com/HOWTO_ALSA_sound_mixer_aka_dmix
They focus on getting the OSS emulation working. No word about AC3 and
SPDIF.
Petr
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