[alsa-devel] Declaring HDMI channel allocation to kernel

[Pierre-Louis Bossart]

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.