VIA EPIA (VT1612A) and SPDIF

VIA EPIA (VT1612A) and SPDIF

[Mathias Kretschmer]

Hi,

I'm wondering if anyone has SPDIF working on the
VIA EPIA ESP5000 under rc7?

Analog output is working fine for me using rc7 and the CVS via82xx 
module (1.25). But, I didn't have any luck getting SPDIF (PCM) to work 
using a Pioneer Digital Receiver.

Any success reports or any hints which knobs to turn to make it work ?

Cheers,

Mathias

Some info from /proc/asound:

[root@musicbox root]# cat /proc/asound/cards
0 [rev40          ]: VIA686A - VIA 82C686A/B rev40
                      VIA 82C686A/B rev40 at 0xdc00, irq 10

[root@musicbox root]# cat /proc/asound/card0/ac97#0
0-0/0: VIA Technologies VIA1612A

Capabilities     : -headphone out-
DAC resolution   : 18-bit
ADC resolution   : 18-bit
3D enhancement   : Reserved 27

Current setup
Mic gain         : +0dB [+0dB]
POP path         : pre 3D
Sim. stereo      : off
3D enhancement   : off
Loudness         : off
Mono output      : MIX
Mic select       : Mic1
ADC/DAC loopback : off
Extended ID      : codec=0 rev=0 AMAP DSA=0 SPDIF VRA
Extended status  : SPDIF=3/4 SPDIF VRA
PCM front DAC    : 44100Hz
PCM ADC          : 48000Hz
SPDIF Control    : Consumer PCM Copyright Category=0x2 Generation=1 
Rate=48kHz



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Re: VIA EPIA (VT1612A) and SPDIF

[Takashi Iwai]

[-- Attachment #1: Type: text/plain, Size: 767 bytes --]

At Tue, 18 Feb 2003 19:17:47 -0500,
Mathias Kretschmer wrote:
> 
> Hi,
> 
> I'm wondering if anyone has SPDIF working on the
> VIA EPIA ESP5000 under rc7?
> 
> Analog output is working fine for me using rc7 and the CVS via82xx 
> module (1.25). But, I didn't have any luck getting SPDIF (PCM) to work 
> using a Pioneer Digital Receiver.
> 
> Any success reports or any hints which knobs to turn to make it work ?

the code on rc7 doesn't set the correct SPDIF rate, so it won't work
properly.  i changed via82xx.c to set it for via686, too.  please try
the cvs version.

in addition, copy the attached to /usr/share/alsa/cards.
and try playback via "spdif" or "iec958" pcm, e.g.

	% aplay -Dspdif foo.wav

(don't ask me how to use spdif on oss programs :)


Takashi

[-- Attachment #2: VIA686A.conf --]
[-- Type: application/octet-stream, Size: 852 bytes --]

#
# Configuration for the VIA686
#

<confdir:pcm/front.conf>

VIA686A.pcm.front.0 {
	@args [ CARD ]
	@args.CARD {
		type string
	}
	type hw
	card $CARD
	device 0
}	

<confdir:pcm/iec958.conf>

VIA686A.pcm.iec958.0 {
	@args [ CARD AES0 AES1 AES2 AES3 ]
	@args.CARD {
		type string
	}
	@args.DEV {
		type integer
	}
	@args.AES0 {
		type integer
	}
	@args.AES1 {
		type integer
	}
	@args.AES2 {
		type integer
	}
	@args.AES3 {
		type integer
	}
	type hooks
	slave.pcm {
		type hw
		card $CARD
		device 0
	}
	hooks.0 {
		type ctl_elems
		hook_args [
			{
				name "IEC958 Playback AC97-SPSA"
				lock true
				preserve true
				value 0
			}
			{
				name "IEC958 Playback Default"
				lock true
				preserve true
				value [ $AES0 $AES1 $AES2 $AES3 ]
			}
			{
				name "IEC958 Playback Switch"
				lock true
				preserve true
				value true
			}
		]
	}
}

Re: VIA EPIA (VT1612A) and SPDIF

[Mathias Kretschmer]

Takashi Iwai wrote:
> At Tue, 18 Feb 2003 19:17:47 -0500,
> Mathias Kretschmer wrote:
> 
>>Hi,
>>
>>I'm wondering if anyone has SPDIF working on the
>>VIA EPIA ESP5000 under rc7?
>>
>>Analog output is working fine for me using rc7 and the CVS via82xx 
>>module (1.25). But, I didn't have any luck getting SPDIF (PCM) to work 
>>using a Pioneer Digital Receiver.
>>
>>Any success reports or any hints which knobs to turn to make it work ?
> 
> 
> the code on rc7 doesn't set the correct SPDIF rate, so it won't work
> properly.  i changed via82xx.c to set it for via686, too.  please try
> the cvs version.

OK, I just installed the lastest CVS snapshot and also copied
VIA686A.conf to /usr/share/alsa/cards.

Using aplay I'm getting some spdif output. It's very jerky, though.
There is audio for a few 100ms and then silence, and then signal again.
Same effect using an OSS player.  The analog output works fine - no 
interruptions at all.

The sample rate as either 44.1kHz or 48kHz - same problem.

I just got a EPIA-M1000 board. It has a 8235 and spdif works just fine
here using either aplay or an OSS player.

Any further info I can provide to help tracking down the problem ?

Cheers,

Mathias



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rules for /proc/asound [was: VIA EPIA (VT1612A) and SPDIF]

[Martin Langer]

On Tue, Feb 18, 2003 at 07:17:47PM -0500, Mathias Kretschmer wrote:
> 
> [root@musicbox root]# cat /proc/asound/card0/ac97#0
> 0-0/0: VIA Technologies VIA1612A
> 
> Capabilities     : -headphone out-
> DAC resolution   : 18-bit
> ADC resolution   : 18-bit
> 3D enhancement   : Reserved 27
> 
> Current setup
> Mic gain         : +0dB [+0dB]
> POP path         : pre 3D
> Sim. stereo      : off
> 3D enhancement   : off
> Loudness         : off
> Mono output      : MIX
> Mic select       : Mic1
> ADC/DAC loopback : off
> Extended ID      : codec=0 rev=0 AMAP DSA=0 SPDIF VRA
> Extended status  : SPDIF=3/4 SPDIF VRA
> PCM front DAC    : 44100Hz
> PCM ADC          : 48000Hz
> SPDIF Control    : Consumer PCM Copyright Category=0x2 Generation=1 
> Rate=48kHz
> 


Are there any rules for /proc/asound/cardX/XXX status files? Has it to be
readable by an external script? I think using standard control names can be 
one point. Are there other things I have to think about? Or is it still an
area without rules?


martin



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