[mythtv-users] HDMI audio help

[Michael Drons]

mythfe tmp # aplay -L
front:CARD=NVidia,DEV=0
    HDA NVidia, HDA Generic
    Front speakers
surround40:CARD=NVidia,DEV=0
    HDA NVidia, HDA Generic
    4.0 Surround output to Front and Rear speakers
surround41:CARD=NVidia,DEV=0
    HDA NVidia, HDA Generic
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=NVidia,DEV=0
    HDA NVidia, HDA Generic
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=NVidia,DEV=0
    HDA NVidia, HDA Generic
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=NVidia,DEV=0
    HDA NVidia, HDA Generic
    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers null
    Discard all samples (playback) or generate zero samples (capture)


I believe it should work.  It is a Zotac ION 230 MB.    BUT I dont see the correct info above, correct???

Is this a driver issue in the kernel?  Or the nvidia driver that I installed?

Thanks, Mike



----- Original Message ----
From: Ben Lancaster <mail at benlancaster.co.uk>
To: mythtv-users at mythtv.org
Sent: Tue, October 13, 2009 9:44:38 AM
Subject: Re: [mythtv-users] HDMI audio help

> 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
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