[mythtv-users] Soundblaster live and AC3 for MythDVD help

[Kyle Rose]

Gregg Farhat <3gemail at gmail.com> writes:

> Okay.  I have an onboard sound card which is disabled, and the sblive.
>  The sound currently works through the SPDIF for mythtv and mythvideo,
> but when I play a DVD I get static. I don't intend to sound dumb, but
> I did not know how to handle the entrys with multiples. Here is what I
> get from  lsmod | egrep snd
>
> snd_emu10k1            88521  1 
> snd_rawmidi              21733  1 snd_emu10k1
> snd_pcm                   83529  1 snd_emu10k1
> snd_timer                  25413  1 snd_pcm
> snd_seq_device         6473  2 snd_emu10k1,snd_rawmidi
> snd_ac97_codec        58821  1 snd_emu10k1
> snd_page_alloc          8393  2 snd_emu10k1,snd_pcm
> snd_util_mem            3521  1 snd_emu10k1
> snd_hwdep                6597  1 snd_emu10k1
> snd                           45477  10
> snd_emu10k1,snd_rawmidi,snd_pcm,snd_timer,snd_s
> eq_device,snd_ac97_codec,snd_util_mem,snd_hwdep
> soundcore                 7713  1 snd

So, for now I'd blacklist snd_seq_device, snd_rawmidi, and snd_hwdep.
Here's what I have:

snd_intel8x0
snd_ac97_codec
snd_pcm_oss
snd_mixer_oss
snd_pcm
snd_timer
snd
snd_page_alloc

Okay, so once you do this, here's my /etc/asound.conf (or .asoundrc):

pcm.krose-dmix {
  type dmix
  ipc_key 3516
  ipc_key_add_uid yes
  slave {
        pcm "hw:0,0"
        period_time 0
        period_size 1024
        buffer_size 4096
        rate 48000
  }
}

pcm.dsp0 {
  type plug
  slave.pcm "krose-dmix"
}

ctl.mixer0 {
  type hw
  card 0
}

pcm.!default {
  type plug
  slave.pcm "krose-dmix"
}

I actually *only* have problems with AC3 output with mythtv, and only
on the first attempt: all subsequent attempts succeed.  I have no
problems with xine.  I'd just make sure you have the following lines
in your .xine/config:

audio.a52_pass_through:1
audio.alsa_a52_device:iec958:AES0=0x6,AES1=0x82,AES2=0x0,AES3=0x2
audio.alsa_mmap_enable:0
audio.alsa_default_device:default
audio.driver:alsa

The alsa_a52_device line may be commented out; if so, you should be
able to leave it as-is.

Lemme know how this works.

Cheers,
Kyle