[alsa-devel] [RFC v2 6/6] ASoC: hdmi-codec: Use HDMI notifications to add jack support

[Takashi Iwai]

On Fri, 08 Jan 2016 11:46:23 +0100,
Russell King - ARM Linux wrote:
> 
> Given that, I'd like to throw in here another detail: iirc, i915's
> HDMI exports the ELD to userspace via a control called "ELD" - see
> eld_bytes_ctl in sound/pci/hda/patch_hdmi.c.  This allows userspace
> to monitor, and read the ELD including which compressed audio formats
> are supported.  I'm not currently aware of anything that makes use of
> this, but as there is this precedent for exporting this information,
> maybe it should become a standard way, so that video playback
> applications can then select an appropriate audio stream depending on
> the current properties of the connected device?

Right, the ELD ctl elements were introduced exactly for such a
purpose.  Though, I'm not sure currently which user-space app is
actually referring to this information, too.  But certainly it's a
good thing to have for other drivers.


Takashi