[Bug 98797] [BXT/KBL] - HDMI - HD audio passthrough dont work

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98797

--- Comment #83 from Libin Yang <libin.yang at intel.com> ---
(In reply to Jani Nikula from comment #82)
> (In reply to Achilles from comment #81)
> > (In reply to Peter Frühberger from comment #78)
> > > @Shashank: Yeah please sync with Jani / Audio-Team offline on that matter as
> > > what you are currently testing has nothing to do with this bugreport here.
> > @shashank
> > You need to test HD audio bitstreaming/passthrough and not PCM audio that
> > has been decoded by a player.
> 
> Yeah, we have a gap here. Libin?

Do you mean the test cases? If yes, I think our QA can share the test cases
internally. I'm not sure we can share the cases outsides.

For the HBR audio test, I can share some knowledge as I know.

There is 2 modes to play HBR audio, one is sw decode, the other is hw decode.
My understanding is this thread is talking about hw decode.

mplayer supports 2 modes with different parameters. If using hw decode, we need
a AV receiver which supports hw decode (Some AV receivers need manually setting
to use hw decode, others don't). 

So use hw decode in mplay and right setting in AV receiver can do the test for
HBR audio.

> 
> > https://01.org/linuxgraphics/gfx-docs/drm/ch04s02.html#id-1.4.3.4.10
> 
> I hope we don't have any links pointing to the old formatting, the up to
> date link is:
> 
> https://01.org/linuxgraphics/gfx-docs/drm/gpu/i915.html#high-definition-audio

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