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

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.

Takashi