On 11/21/2011 03:35 AM, David Henningsson wrote:
On 11/17/2011 10:14 PM, Kelly Anderson wrote:
Hi,
I finally got around to working out the kinks to pass-through
high-definition audio
in Xbmc. Funny how long it took me to get back to it. I was
re-reading some
emails on the list from way back in March and one of the emails turned
me on to
a proper solution. One thing that I wasn't able to do was to get
PulseAudio
to pass-through 8 channel audio when the device's sink was set as
hdmi-stereo.
So I patched PulseAudio 1.1 for hdmi-surround-71 and lo and behold it
worked.
Here's a patch, hopefully we can get this added in the next official
release
of PulseAudio. I know that there are quite a few Xbmc users that have
been anxiously
waiting for high-definition audio pass-through to work correctly. Of
course if someone
has a better solution, that would be fine too.
--- ./src/modules/alsa/mixer/profile-sets/default.conf.orig 2011-10-20
06:54:16.000000000 -0600
+++ ./src/modules/alsa/mixer/profile-sets/default.conf 2011-11-17
02:16:00.038900536 -0700
@@ -173,6 +173,12 @@ channel-map = left,right
priority = 4
direction = output
+[Mapping hdmi-surround-71]
+device-strings = hdmi:%f
+channel-map =
front-left,front-right,rear-left,rear-right,front-center,lfe,side-left,side-right
I've been experimenting with enabling such stuff in Ubuntu, but never
got any positive or negative feedback about it. FYI, I'm attaching
what we're shipping for Nvidia and Intel (as part of the jack
detection stuff) in Ubuntu 11.10.
And Colin, you're right: this isn't passthrough, this is multichannel
PCM.
It's not specifically pass-through, but high-def (i.e, DTS-HD)
pass-through requires an 8 channel mapping. I've got Xbmc/PulseAudio
pass-through working well. It passes low bit rate data through as 2
channel and high bit rate data as 8 channel. Specifically what I have
to do in the Xbmc/PulseAudio code is switch the sink to 8 channels when
requiring high bit rates and switch back to 2 channels for standard bit
rates. The last couple of commits pertain to the 2/8 channel switching.
git://github.com/cbxbiker61/xbmc.git
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