Sound help

Sebastian Kügler sebas at
Mon Sep 24 12:52:47 CEST 2007

On Sunday 23 September 2007 16:48:23 Matthias Kretz wrote:
> Hi Sebastian and Helio,
> On Sunday 23 September 2007, Sebastian Kügler wrote:
> > On Sunday 23 September 2007 00:10:17 you wrote:
> > > I saw the blog entry.
> > > What help is needed in sound area. I can do a little from here at
> > > least.
> >
> > The release team is currently trying to find out what exactly needs doing
> > to get those different components release ready, for sound, Matthias is
> > probably the one who knows this best.
> >
> > Matthias, can you fill me in?
> Phonon for local audio playback is working quite ok already, but there are
> several issues still open:

Thanks Matthias, I've added your list to the Goals on techbase, can you check 
if the information is accurate? 

> 1. (short version: lazy
> symbol resolving in glibc is not threadsafe and can deadlock) This bug can
> cause spurious deadlocks, though for me running with LD_BIND_NOW=1 made it
> go away.
> 2. Sound hardware/ALSA setup:
>  a) Currently the default list of audio devices to use is in arbitrary
> order. This needs to be fixed otherwise esd, artsd, jack or S/PDIF output
> can turn up as most preferred device and make it look like nothing is
> working. This might need something along the lines of a "hardware
> database".
>  b) I've had a report that outputting to a dmix: ALSA device using a
> hardware mixing capable soundcard made mixing not work at all (don't ask me
> why), so the ALSA device name choosing algorithm might need to become a bit
> smarter. I think the safest bet for now is to use the default:CARD=...
> device string, but with that you can only choose what card you want, not
> what device on that card (I don't have hardware where this would make a
> difference, so no idea if it's needed).
>  c) Even though defaults.pcm.ipc_gid is set to audio and
> defaults.pcm.ipc_perm is set to 0660, dmix does not work for more than one
> user at the same time (both users are in the audio group). A workaround is
> to set ipc_perm to 0666, but a real fix would be nicer.
> 3. Once again switching soundcards with phonon-xine is broken, I have to
> look into it...
> 4. kmix is not in a good state (yet). E.g. it crashes on application
> shutdown for me (and with that forgetting all changes done in the config
> dialog). It still does not react on plugged/unplugged soundcard or
> new/removed software control.
> 5. Playing short sound files sometimes only plays the start of the sound
> (which can be almost nothing). This is a big problem for notifications.
> Some reported that this is a bug in xine-lib, but I have not looked into
> the issue.
> 6. xine-lib behaves bad wrt. memory allocations. run e.g. mediaobjecttest
> in valgrind --tool=massif

sebas | |  GPG Key ID: 9119 0EF9 
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