On Fri, Nov 19, 2010 at 02:15:54PM +0100, torbenh wrote:
> On Wed, Nov 17, 2010 at 03:16:32PM +0800, Raymond Yau wrote:
> > 2010/11/12 Paul Menzel <paulepanter@xxxxxxxxxxxxxxxxxxxxx>
> >
> > > Am Mittwoch, den 10.11.2010, 11:18 +0100 schrieb torbenh:
> > > > On Mon, Nov 08, 2010 at 10:26:47AM +0100, torbenh wrote:
> > > > >
> > > > > the alsa jack plugin has quite some problems:
> > > > > a) does not work correctly with mplayers alsa output. (and quite a few
> > > > > others)
> > >
> >
> > AFAIK, mplayer , aplay and the alsa-jack plugin 1.0.1still working with
> > jack-0.118
> >
> > So you have to tell the jack plugin fail to work from from which version of
> > jack if jack change the protocol
>
> jack did not change the protocoll.
>
> however, the write to the socket fd might block.
> doing potentially blocking things in jacks process callback is not
> legal. (this kind of problems only show under low-latency situations,
> period_size of 128 and lower)
>
> the result of the blocking write is jack kicking the client.
> and just making the fd NONBLOCK, "fixed" the problem.
> (it seems to cause some other problems down the road, since some
> bytes written to the fd get lost)
>
> i would really like to exchange the socket for a signalfd.
> increasing the signal count of the fd would never block.
err... that should read eventfd, obviously :S
>
> (but i am not sure about the requirements, signalfd only exists since
> 2.6.27, and i am not sure, if the old socket based code should be left
> in there as a fallback)
>
>
>
> >
> > The current Documentation of jack plugin "doc/README-jack" has a mistake
> >
> >
> > pcm.jack {
> > type jack
> > playback_ports {
> > 0 alsa_pcm:playback_1
> > - 1 alsa_pcm:playback_1
> > + 1 alsa_pcm:playback_2
> > }
> > capture_ports {
> > 0 alsa_pcm:capture_1
> > - 1 alsa_pcm:pcapture_1
> > + 1 alsa_pcm:pcapture_2
> > }
> > }
> > _______________________________________________
> > Alsa-devel mailing list
> > Alsa-devel@xxxxxxxxxxxxxxxx
> > http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
>
> --
> torben Hohn
> _______________________________________________
> Alsa-devel mailing list
> Alsa-devel@xxxxxxxxxxxxxxxx
> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
--
torben Hohn
_______________________________________________
Alsa-devel mailing list
Alsa-devel@xxxxxxxxxxxxxxxx
http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
