Wow, wasn't expecting code so quickly - thanks! I've been away for a bit. Is this working and done? Do I need to get PA 3 and a patch on my system or is it all good and in the queue for an offical release in the future? Many Thanks Carl On 21 March 2013 09:45, Carl Gridley <crgridley at gmail.com> wrote: > Hi Tanu, > > Thanks for replying :-) > > When upmixing is disabled, mono playback is silent but does not generate > errors that I can see from pulseaudio -vvv or any notifications. > > Here's a bit of output: > > I: [pulseaudio] source-output.c: Trying to change sample rate > I: [pulseaudio] source-output.c: Resampling enabled to 44100 Hz > D: [pulseaudio] module-suspend-on-idle.c: Sink > alsa_output.pci-0000_01_00.1.hdmi-surround-extra1 becomes busy. > D: [pulseaudio] resampler.c: Channel matrix: > D: [pulseaudio] resampler.c: I00 I01 I02 I03 I04 I05 > D: [pulseaudio] resampler.c: +------------------------------------ > D: [pulseaudio] resampler.c: O00 | 0.000 0.000 0.000 0.000 0.000 0.000 > I: [pulseaudio] remap.c: Using generic matrix remapping > I: [pulseaudio] resampler.c: Using resampler 'peaks' > I: [pulseaudio] resampler.c: Using float32le as working format. > D: [pulseaudio] memblockq.c: memblockq requested: maxlength=33554432, > tlength=0, base=12, prebuf=0, minreq=1 maxrewind=0 > D: [pulseaudio] memblockq.c: memblockq sanitized: maxlength=33554436, > tlength=33554436, base=12, prebuf=0, minreq=12 maxrewind=0 > I: [pulseaudio] source-output.c: Created output 14 "Peak detect" on > alsa_output.pci-0000_01_00.1.hdmi-surround-extra1.monitor with sample spec > float32le 1ch 25Hz and channel map mono > > > > This particular one is from a mono youtube video played in Chrome, the > behaviour is the same in other applications too. > > For the plans comment, this is just a quote referring to fine-grained > control over upmixing from this thread: > http://lists.freedesktop.org/archives/pulseaudio-bugs/2009-December/003553.html > > That was several years ago though. > > I think your option would be good, to make sure I understand it it would > be: > > - no upmixing of stereo sources (or any multichannel source) with the > upmix module disabled > - mono would still be upmixed (probably to all channels) regardless of the > upmix module being active or not > > Or something functionally equivalent to the above. > > If I can help with testing I'm happy to try any patch on my system. > > Cheers > Carl > > > > > > > On 21 March 2013 07:58, Tanu Kaskinen <tanuk at iki.fi> wrote: > >> On Wed, 2013-03-20 at 10:34 +0000, Carl Gridley wrote: >> > Hi folks, >> > >> > I have found some old messages on this, but wondered if anything had >> > changed or anyone had any bright ideas on it now :-) >> > >> > I have PA 2.1 running on Kubutu 12.10. >> > >> > It is connected via HDMI to my AV receiver and so I have 5.1 PCM output. >> > >> > I've got two music speakers, and the surround speakers are much >> smaller, so >> > I turn 5.1 upmixing off. I also turn off LFE mixing as the receiver >> does a >> > good job and can set a crossover per channel. >> > >> > Everything sounds great, but mono sounds don't work as they can't get >> > upmixed to stereo. If I re-enable upmixing, mono works, but then all >> stereo >> > sources get upmixed which I'd prefer not to. >> >> I haven't bothered to try this myself: how do mono streams behave when >> upmixing is disabled? Does the stream fail to connect to the device, or >> does it connect but is silent, or something else? >> >> > I know from the previous notes there were no plans to allow more control >> > over upmixing, has this changed at all? >> >> No plans in what sense? Patches for enabling sensible use cases will be >> accepted, and this use case definitely is sensible. If you mean "no >> plans" as in "nobody has promised to do the work", then you're right, >> and nothing has changed. >> >> > An option just to enable mono >> > upmixing only would be fantastic :-) >> > >> > Or even map mono to the centre channel if one is reported. >> >> I'm not sure there is need to have any new options. If mono streams >> don't work at all in case upmixing is disabled, I don't see why anyone >> would want to keep the current behavior. We could have a special case >> for mono-only streams so that such streams would always be upmixed to >> all channels (or some smart selection of a subset of the available >> channels, but all channels is easier to implement). >> >> I looked at the remixing code to determine what it would take to >> implement this, and it seems simple enough that I'll write a patch >> myself. >> >> -- >> Tanu >> >> > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.freedesktop.org/archives/pulseaudio-discuss/attachments/20130403/1d11d885/attachment-0001.html>
