[pulseaudio-discuss] [PATCH] AC3 passthrough support

Colin Guthrie gmane at colin.guthr.ie
Thu Oct 14 10:22:40 PDT 2010

'Twas brillig, and Joakim Plate at 14/10/10 13:40 did gyre and gimble:
>>> To use this feature from other frameworks (gstreamer, etc), we will
>>> need a tagged release to #ifdef code related to AC3 passthough for
>>> backwards compatibility. Any idea when that might happen?
>>> (would also be nice to close the gap between git master and meego
>>> versions while we are at it...)
> What's the status on this? Is it usable and #ifdef able? This would be damn good 
> news for us (xbmc).

Hi Joakim,

FWIW, I'm an XBMC user and very much appreciate as a bit of software -
big fan (especially as the beginnings of MythTV PVR support were added
the other day :D)

For my audio setup I actually use the ALSA output in 5.1 channel mode.
It talks to pulse and then I setup the a52 based digital 5.1 output over

This is clearly suboptimal for the movies where passthrough would be
preferred, but it's a very desirable solution as things stand right now.

What would be great is if the direct PA output could use 5.1 channels
more effectively than it does just now and that would mean I could stop
pushing things through ALSA.

(I may have to double check my setup as I've not looked at it for a
while, but IIRC last time I tried direct PA output support it downmixed
to 2ch in XBMC before hitting PA which then upmixed to 5.1)

Anyway, I'd be very happy to discuss both the short and longer term
approach for this with you either here or on #pulseaudio or #xbmc-linux
(I am in both).

Take care



Colin Guthrie

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