On Sat, Mar 7, 2009 at 4:43 PM, Daniel B. Thurman <d...@cdkkt.com> wrote:
> Kevin Kofler wrote: > >> Ir wrote: >> >> >>> Running JACK on top of PulseAudio is not supported at >>> this point. (It should theoretically work by enabling JACK's PortAudio >>> backend now that PortAudio works with PulseAudio, but you'd be going >>> through 4 layers JACK->PortAudio->ALSA->PulseAudio, so it isn't quite >>> ideal for JACK's real-time requirements. And I have yet to test this - >>> Fedora's JACK currently isn't built with PortAudio enabled.) >>> >>> >> >> Well, I just checked and JACK's PortAudio backend uses the ancient >> PortAudio >> v18 API, so at this point it might actually be less work to just fix the >> native ALSA support to support non-mmap access (and thus PulseAudio) like >> I >> already did for PortAudio. (I may have a try at it if I get some time, >> though I don't expect all that much interest in allowing JACK to work on >> top of PulseAudio.) And in the upcoming (and API-incompatible - looks like >> that will be "fun") JACK 2, PortAudio appears to be only supported on >> Window$ (though it's finally v19). Another possibility may be to write a >> native PulseAudio driver. >> >> For you as a user, the "PulseAudio on top of JACK" setup is certainly the >> best solution as it works now. It's also the way JACK gets the lowest >> possible latency. The drawback is that the sounds from most common desktop >> apps will be routed through both PulseAudio and JACK and that it requires >> reconfiguration because Fedora is set up for PulseAudio by default, >> whereas "JACK on top of PulseAudio" would ideally "just work" (but right >> now it doesn't work at all). >> >> Kevin Kofler >> >> > Bummer. So in a nutshell, I cannot use RoseGarden until all of these > issues (PA) > are fixed/resolved, right? I could perhaps disable PA and enable JACK to > use RG, > but then might run into problems trying to get PA back, probably not worth > the > hassle. I think I will pass for now. > > I was trying to find a MIDI player that works and kmid just does not work > (cannot > figure it out), so... I think I will postpone it for now. > > I am not going into this discussion, but I have been using rosegarden with jack in F10 for quite some time with no problem at all, and a very low latency. qjackctl - qsynth - rosegarden This is the contents of my ~/.jackdrc /usr/bin/jackd -R -dalsa -r44100 -p128 -n2 -D -C/dev/dsp -Phw:0 -i2 -o2 -- Paulo Roma Cavalcanti LCG - UFRJ
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