Am Mittwoch, 17. September 2014, 11:05:41 schrieb David Henningsson:
> On 2014-09-16 22:25, Martin Steigerwald wrote:
> > Hello!
> >
> > Any solution for this?
> >
> > When playing PlaneShift through Pulseaudio while PlaneShift is setup to
> > use
> > OpenAL as sound renderer I get:
> >
> > AL lib: pulseaudio.c:331: PulseAudio returned minreq > tlength/2; expect
> > break up
> >
> > and well badly stuttering sound.
>
> I'm not very familiar with OpenAL, and a quick look through the source
> (in Ubuntu 14.04) did not show any such warning message.
>
> So I'm not sure what that warning means, and if the error is in OpenAL
> or in PulseAudio.
>
> In theory, any application should be able deal with big minreqs and
> tlengths. In practice I know we've had issues with tlengths increasing
> gradually in the past, and I'm not sure all those issues have been root
> caused.
Thanks for looking into this.
I tried PlaneShift without PulseAudio but with setting:
device = default:CARD=Pebbles
into /etc/openal/alsoft.conf
This playbacks just fine. And wow? how fine :)
No stuttering this way. This at least proves that OpenAL and PlaneShift do not
produce the stuttering by themselves.
The alsoft.conf has several settings things that may change something, like:
## periods:
# Sets the number of update periods. Higher values create a larger mix ahead,
# which helps protect against skips when the CPU is under load, but increases
# the delay between a sound getting mixed and being heard. Acceptable values
# range between 2 and 16.
#periods = 4
But since I don?t understand the actual problem that leads to the stuttering,
i.e. don?t now about minreqs and tlengths, I am at a loss what settings to
try.
As to the source: It indeed hasn?t the error message in pulseaudio.c directly:
327 #undef LOAD_OPTIONAL_FUNC
328
329 if(ret == ALC_FALSE)
330 {
331 CloseLib(pa_handle);
332 pa_handle = NULL;
333 }
334 }
335 #endif /* HAVE_DYNLOAD */
And I only see a similar error message in a different backend:
martin at merkaba:~/Zeit/openal/openal-soft-1.15.1> grep -ir "expect break up" .
./Alc/backends/mmdevapi.c: ERR("Audio client returned buffer_len <
period*2; expect break up\n");
Strange.
Its exact the source package of the version I have installed: 1.15.1-5
And error message indiciates it is from libopenal.
Ciao,
--
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA B82F 991B EAAC A599 84C7
