[alsa-devel] Wrong channel order with multichannel HDMI on NVIDIA MCP7A

[pl bossart]

> Well, this is one of my looong-standing TODOs.
> Originally I wanted to implement a new API to get/set the
> channel-mapping, mainly for HDMI.
> But, I've been recently too busy for other tasks (I can spend little
> time for ALSA), thus it's pending forever.

You would only need an API to get the channel mapping. The HDMI sink
will report its speaker configuration through a CEA code (section 7.4
of the spec), and if we parsed the EDID info we could present the
relevant channel order to user-space apps.