* Question about surround default pin config
@ 2012-08-09 12:51 David Henningsson
2012-08-09 13:01 ` Takashi Iwai
0 siblings, 1 reply; 2+ messages in thread
From: David Henningsson @ 2012-08-09 12:51 UTC (permalink / raw)
To: alsa-devel; +Cc: Takashi Iwai
Hi,
Sometimes it's better to just ask than getting confused trying to figure
it out yourself.
When you have 2 stereo pairs of line-out or speaker, they are meant as
either 4.0 (front left, front right, rear left, rear right), and
sometimes they are meant as 2.1 (front left, front right, unused, lfe).
We should support both variations, I assume.
What is really the way to write my pin fixups to specify either 4.0 or
2.1? Are there any de-facto standards?
If I look at e g check_output_sfx (in hda_auto_parser.c), it looks like
it would be impossible to have 2.1, i e, impossible to have LFE without
also having rear left and rear right. But I might be missing something?
--
David Henningsson, Canonical Ltd.
https://launchpad.net/~diwic
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Question about surround default pin config
2012-08-09 12:51 Question about surround default pin config David Henningsson
@ 2012-08-09 13:01 ` Takashi Iwai
0 siblings, 0 replies; 2+ messages in thread
From: Takashi Iwai @ 2012-08-09 13:01 UTC (permalink / raw)
To: David Henningsson; +Cc: alsa-devel
At Thu, 09 Aug 2012 14:51:40 +0200,
David Henningsson wrote:
>
> Hi,
>
> Sometimes it's better to just ask than getting confused trying to figure
> it out yourself.
>
> When you have 2 stereo pairs of line-out or speaker, they are meant as
> either 4.0 (front left, front right, rear left, rear right), and
> sometimes they are meant as 2.1 (front left, front right, unused, lfe).
>
> We should support both variations, I assume.
>
> What is really the way to write my pin fixups to specify either 4.0 or
> 2.1? Are there any de-facto standards?
>
> If I look at e g check_output_sfx (in hda_auto_parser.c), it looks like
> it would be impossible to have 2.1, i e, impossible to have LFE without
> also having rear left and rear right. But I might be missing something?
Right, as of now, 2.1 configuration isn't supported by the parser.
It's a bit messy. We can check the associated number whether it's 4.0
or 2.1, but I don't think there is a strict definition to
differentiate between them. So, it'd end up with a guess work.
Of course, we can add some special flag beforehand and let auto-parser
handle 4.0 as 2.1.
Takashi
^ permalink raw reply [flat|nested] 2+ messages in thread
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2012-08-09 13:01 ` Takashi Iwai
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