[mythtv-users] HDMI audio help

[Ben Lancaster]

> Yes I have read that Howto.
>
> I have Internal + External enabled in the BIOS.
> ALSA is 1.0.20
> Kernel is 2.6.31
>
> mythfe ~ # cat /proc/driver/nvidia/version
> NVRM version: NVIDIA UNIX x86 Kernel Module  185.18.31  Tue Jul 28  
> 15:43:22 PDT 2009
> GCC version:  gcc version 4.4.1 (Gentoo 4.4.1 p1.0)
>
> I do not get aIEC958 Playback  device..  See below.
>
> mythfe ~ # aplay -l
> **** List of PLAYBACK Hardware Devices ****
> card 0: NVidia [HDA NVidia], device 0: ALC662 rev1 Analog [ALC662  
> rev1 Analog]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
> card 0: NVidia [HDA NVidia], device 1: ALC662 rev1 Digital [ALC662  
> rev1 Digital]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
>
> I have believe I have the correct modules loaded.
>
>
> Thanks for the help, Mike


Hey

Try `aplay -L` to get a full list of available devices by name as -l  
only shows you the cards not actual devices the card will accept, you  
should see iec958 in there if it's available.

Does your mainboard have an onboard Intel HDA device? I could never  
get the stuff on the video card to work, but mine has an  
(undocumented) SPDIF connector, which I connected to the Intel HDA  
SPDIF connector on the board. My asoundrc is as follows:

pcm.dmixer {
type dmix
ipc_key 1024
ipc_key_add_uid false
ipc_perm 0660
slave {
pcm "hw:0,3"
rate 48000
channels 2
period_time 0
period_size 1024
buffer_time 0
buffer_size 4096
}
}

pcm.!default {
type plug
slave.pcm "dmixer"
}

I also had to go through the Gnome audio prefences and set all audio  
output to use the digital device to ensure that all applications use  
the digital device and not the analogue one. Mythtv is set to use  
ALSA:cards.pcm.iec958 for audio and ALSA:iec958:{ AES0 0x02 } for  
passthru, and it works a charm - AC3/DTS passthrough, as well as rate  
switching between 44100 and 48000 depending on the source (CD or Live  
TV)

Hope that helps.

Ben