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

Takashi Iwai tiwai at suse.de
Mon Oct 8 10:20:02 CEST 2012

At Thu, 04 Oct 2012 23:50:20 -0700,
Patrick Lai wrote:
> Hi Takashi,
> You proposed snd_pcm_query_chmaps() to query underlying hardware
> speaker allocation. Please correct me if I have wrong understanding of
> this API. On the other hand, HDMI EDID contains audio data other than
> speaker allocation such as audio formats(LPCM, AC3, and etc). How are
> these information other than speaker allocation passed back to the
> user-space? Are there a standard kernel and alsa query interfaces now?

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.


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