[alsa-devel] Passing audio info from HDMI EDID beside speaker allocation

Takashi Iwai tiwai at suse.de
Tue Oct 23 14:16:57 CEST 2012

At Mon, 22 Oct 2012 11:00:02 -0700,
Patrick Lai wrote:
> On 10/8/2012 1:20 AM, Takashi Iwai wrote:
> > In the case of HD-audio, it's passed via the normal IEC958 status bits
> > controls separately.  ELD itself is exposed as a byte array in a
> > control element, but it's read-only.
> Thanks for the reply. Couple more questions
> 1. Is kcontrol "ELD" being read directly by application or there is
> ALSA library API to parse the information.

Nothing so far.  It's just a raw data.

> 2. Also, I see you submit this patch [PATCH 3/3] ELD proc interface for
> HDMI sinks in 2008. I presume it's just for information purpose. You
> still expect application to query for HDMI sink capability through
> "ELD" kcontrol. Am I correct?

It's not prohibited for apps to parse the proc interface but it's not
guaranteed to be stable :)  So yes, parsing ELD manually would be a
safer way.


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