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
