[alsa-devel] Declaring HDMI channel allocation to kernel

Takashi Iwai tiwai at suse.de
Tue Jul 24 14:33:13 CEST 2012

At Mon, 23 Jul 2012 14:39:38 -0500,
Pierre-Louis Bossart wrote:
> On 7/23/2012 9:18 AM, Gabriel M. Beddingfield wrote:
> >
> > Is there an established way for me (from userspace) to pass the HDMI 
> > Channel Allocation (1 byte) to the driver?  If not, can you recommend 
> > an approach?
> >
> > In most of the drivers that I've inspected, the drivers seem to assume 
> > that there's a 1:1 mapping of Number-of-Channels to 
> > Channel-Allocation.  However, the HDMI sink declares which speakers it 
> > has attached in the EDID.  If I can match this in userspace... I need 
> > a way to communicate it to the driver.
> I believe this is one of the topics that will be presented by Takashi at 
> LPC, we need the ability to specify a arbitrary sink-specific channel 
> mapping.

Ah, sorry, this topic was canceled due to the time slot limitation.
But I can bring up the topic if we get another time slot, at BoF or


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