28 Dec
2010
28 Dec
'10
4:57 p.m.
hi...
since jack1 release is taking pretty long, i decided to stop waiting
with a tschack release.
tschack is an SMP aware fork of jack1.
its a dropin replacement like jack2.
features:
- jack1 mlocking
- controlapi which works even when libjackserver.so is loaded RTLD_LOCAL
- smp aware
- backendswitching
- strictly synchronous like jack1. (-> no latency penalty)
- clickless connections.
- shuts down audio processing when cpu is overloaded for too long.
i also released PyJackd which is a wrapper around libjackserver.
features:
- commandline for backendswitching
- pulseaudio dbus reservation.
get it here:
http://hochstrom.endofinternet.org/files/tschack-0.120.1.tar.gz
http://hochstrom.endofinternet.org/files/PyJackd-0.1.0.tar.gz
--
torben Hohn
29 Dec
29 Dec
9:58 a.m.
Excerpts from torbenh's message of 2010-12-28 16:57:14 +0100:
hi...
since jack1 release is taking pretty long, i decided to stop waiting
with a tschack release.
tschack is an SMP aware fork of jack1.
its a dropin replacement like jack2.
features:
- jack1 mlocking
- controlapi which works even when libjackserver.so is loaded RTLD_LOCAL
- smp aware
- backendswitching
- strictly synchronous like jack1. (-> no latency penalty)
- clickless connections.
- shuts down audio processing when cpu is overloaded for too long.
i also released PyJackd which is a wrapper around libjackserver.
features:
- commandline for backendswitching
- pulseaudio dbus reservation.
get it here:
http://hochstrom.endofinternet.org/files/tschack-0.120.1.tar.gz
http://hochstrom.endofinternet.org/files/PyJackd-0.1.0.tar.gz
Not sure what half of that means :)
One thing I think you forgot to mention but might be of interest is
jack-session support
30 Dec
30 Dec
4:33 p.m.
On Wed, Dec 29, 2010 at 09:58:16AM +0100, Philipp Überbacher wrote:
Excerpts from torbenh's message of 2010-12-28
16:57:14 +0100:
right. jack-session is supported. but thats what jack1 and jack2 also
support nowadays.
well.... which of the features is unclear ?
hi...
since jack1 release is taking pretty long, i decided to stop waiting
with a tschack release.
tschack is an SMP aware fork of jack1.
its a dropin replacement like jack2.
features:
- jack1 mlocking
- controlapi which works even when libjackserver.so is loaded RTLD_LOCAL
- smp aware
- backendswitching
- strictly synchronous like jack1. (-> no latency penalty)
- clickless connections.
- shuts down audio processing when cpu is overloaded for too long.
i also released PyJackd which is a wrapper around libjackserver.
features:
- commandline for backendswitching
- pulseaudio dbus reservation.
get it here:
http://hochstrom.endofinternet.org/files/tschack-0.120.1.tar.gz
http://hochstrom.endofinternet.org/files/PyJackd-0.1.0.tar.gz
Not sure what half of that means :)
One thing I think you forgot to mention but might be of interest is
jack-session support
_______________________________________________
Linux-audio-user mailing list
Linux-audio-user(a)lists.linuxaudio.org
http://lists.linuxaudio.org/listinfo/linux-audio-user
--
torben Hohn
31 Dec
31 Dec
10:03 p.m.
Excerpts from torbenh's message of 2010-12-30 16:30:33 +0100:
On Wed, Dec 29, 2010 at 09:58:16AM +0100, Philipp
Überbacher wrote:
Oh, I thought there is no jack1 release with jack-session yet, dunno
about jack2.
Excerpts from torbenh's message of 2010-12-28
16:57:14 +0100:
right. jack-session is supported. but thats what jack1 and jack2 also
support nowadays.
well.... which of the features is unclear ?
hi...
since jack1 release is taking pretty long, i decided to stop waiting
with a tschack release.
tschack is an SMP aware fork of jack1.
its a dropin replacement like jack2.
features:
- jack1 mlocking
- controlapi which works even when libjackserver.so is loaded RTLD_LOCAL
- smp aware
- backendswitching
- strictly synchronous like jack1. (-> no latency penalty)
- clickless connections.
- shuts down audio processing when cpu is overloaded for too long.
i also released PyJackd which is a wrapper around libjackserver.
features:
- commandline for backendswitching
- pulseaudio dbus reservation.
get it here:
http://hochstrom.endofinternet.org/files/tschack-0.120.1.tar.gz
http://hochstrom.endofinternet.org/files/PyJackd-0.1.0.tar.gz
Not sure what half of that means :)
One thing I think you forgot to mention but might be of interest is
jack-session support > > features:
> > - jack1 mlocking
Means for a user?
> > - controlapi which works even when
libjackserver.so is loaded RTLD_LOCAL
Means for a user?
> > - smp aware
> > - backendswitching
Means for a user?
> > - strictly synchronous like jack1. (-> no
latency penalty)
Async (jack2?) has a latency penalty?
> > - clickless connections.
> > - shuts down audio processing when cpu is overloaded for too long.
I guess most users don't know very much about the technical details of
the jack implementations.
1 Jan
1 Jan
5:35 p.m.
On 12/31/2010 10:03 PM, Philipp Überbacher wrote:
when you want clickless connections, yes, afaik.
which is good in principle (since it seems to just work), but kind of
implies we are lacking documentation. check out the jackaudio wiki,
torben in particular has been very active there. the wiki seems to be
known little, but there's a link from the jackaudio front page.
Excerpts from torbenh's message of 2010-12-30
16:30:33 +0100:
that a suitably parallel jack graph will use more than one cpu core,
which is a major win.
backend switching means you can change the backend at runtime without
having to tear down your jack graph, which is also very practical in
some situations. (haven't tried it yet, but iiuc you can move from ffado
to alsa backend or between different alsa-supported cards.)
>> - smp aware
>> - backendswitching
Means for a user? >> -
strictly synchronous like jack1. (-> no latency penalty)
Async (jack2?) has a latency penalty? >> -
clickless connections.
>> - shuts down audio processing when cpu is overloaded for too long.
I guess most users don't know very much about the technical details of
the jack implementations.
3 Jan
3 Jan
3:19 p.m.
On Sat, Jan 01, 2011 at 05:35:14PM +0100, Jörn Nettingsmeier wrote:
which is good in principle (since it seems to just work), but kind
of implies we are lacking documentation. check out the jackaudio
wiki, torben in particular has been very active there. the wiki
seems to be known little, but there's a link from the jackaudio
front page.
i doubt, that we documented all the technical details though.
--
torben Hohn
On 12/31/2010 10:03 PM, Philipp Überbacher wrote:
yes. thats right.
you can also change the samplerate, but thats not very well supported
yet.
another nice thing is that you can free the soundcard by switching to
the dummy driver. jack graph still runs. soundcard can be used by some
other software.
Excerpts from torbenh's message of 2010-12-30
16:30:33 +0100:
that a suitably parallel jack graph will use more than one cpu core,
which is a major win.
backend switching means you can change the backend at runtime
without having to tear down your jack graph, which is also very
practical in some situations. (haven't tried it yet, but iiuc you
can move from ffado to alsa backend or between different
alsa-supported cards.) >>- smp aware
>>- backendswitching
Means for a user?
>>>>- strictly synchronous like jack1. (-> no latency penalty)
>
>Async (jack2?) has a latency penalty?
yes.
when you want clickless connections, yes, afaik.
from jack2 JackAlsaDriver.cpp:
// Add one buffer more latency if "async" mode is used...
port->SetLatency((alsa_driver->frames_per_cycle *
(alsa_driver->user_nperiods - 1)) +
((fEngineControl->fSyncMode) ? 0 :
fEngineControl->fBufferSize) + alsa_driver->playback_frame_latency);
>>-
clickless connections.
>>- shuts down audio processing when cpu is overloaded for too long.
I guess most users don't know very much about the technical details of
the jack implementations.
7:43 p.m.
Excerpts from torbenh's message of 2011-01-03 15:19:05 +0100:
On Sat, Jan 01, 2011 at 05:35:14PM +0100, Jörn
Nettingsmeier wrote:
which is good in principle (since it seems to just work), but kind
of implies we are lacking documentation. check out the jackaudio
wiki, torben in particular has been very active there. the wiki
seems to be known little, but there's a link from the jackaudio
front page.
i doubt, that we documented all the technical details though.
Thanks everyone, that pretty much clears it up for me. Seems like
tschack is the most advanced jack implementation now in many ways. It
did already work well when I tried it some time ago, I guess it's time
to try it again
Thanks,
Philipp
On 12/31/2010 10:03 PM, Philipp Überbacher
wrote:
yes. thats right.
you can also change the samplerate, but thats not very well supported
yet.
another nice thing is that you can free the soundcard by switching to
the dummy driver. jack graph still runs. soundcard can be used by some
other software.
Excerpts from torbenh's message of 2010-12-30
16:30:33 +0100:
that a suitably parallel jack graph will use more than one cpu core,
which is a major win.
backend switching means you can change the backend at runtime
without having to tear down your jack graph, which is also very
practical in some situations. (haven't tried it yet, but iiuc you
can move from ffado to alsa backend or between different
alsa-supported cards.) >>- smp aware
>>- backendswitching
Means for a user?
>>>>- strictly synchronous like jack1. (-> no latency penalty)
>
>Async (jack2?) has a latency penalty?
yes.
when you want clickless connections, yes, afaik.
from jack2 JackAlsaDriver.cpp:
// Add one buffer more latency if "async" mode is used...
port->SetLatency((alsa_driver->frames_per_cycle *
(alsa_driver->user_nperiods - 1)) +
((fEngineControl->fSyncMode) ? 0 :
fEngineControl->fBufferSize) + alsa_driver->playback_frame_latency);
>>-
clickless connections.
>>- shuts down audio processing when cpu is overloaded for too long.
I guess most users don't know very much about the technical details of
the jack implementations. 
1 Jan
1 Jan
11:03 p.m.
On 12/31/2010 10:03 PM, Philipp Überbacher wrote:
I'd be interested in this as well.
`man 2 mlock` - preventing memory from being paged to the swap area.
that's needed to prevent stalling audio-applications because they're
swapped out.
What's the difference between jack1 and jack2 mlocking? Announcing this
as feature for tschack hints that jack1's implementation is "better" - why?
TIA,
robin
Excerpts from torbenh's message of 2010-12-30
16:30:33 +0100:
[snip]
>>>
>>> get it here:
>>> http://hochstrom.endofinternet.org/files/tschack-0.120.1.tar.gz
>>> http://hochstrom.endofinternet.org/files/PyJackd-0.1.0.tar.gz
>>
>> Not sure what half of that means :)
>> One thing I think you forgot to mention but might be of interest is
>> jack-session support
>
> right. jack-session is supported. but thats what jack1 and jack2 also
> support nowadays.
There's support for it in both jack1 and jack2 SVN, but there's no
official release where it is enabled by default.
well.... which
of the features is unclear ?
Oh, I thought there is no jack1 release with jack-session yet, dunno
about jack2.
>> features:
>> - jack1 mlocking
Means for a user? >> -
controlapi which works even when libjackserver.so is loaded RTLD_LOCAL
Means for a user?
>> - smp aware
>> - backendswitching
Means for a user?
>> - strictly synchronous like jack1. (->
no latency penalty)
Async (jack2?) has a latency penalty?
>> - clickless connections.
>> - shuts down audio processing when cpu is overloaded for too long.
I guess most users don't know very much about the technical details of
the jack implementations.
_______________________________________________
Linux-audio-user mailing list
Linux-audio-user(a)lists.linuxaudio.org
http://lists.linuxaudio.org/listinfo/linux-audio-user
3 Jan
3 Jan
3:12 p.m.
On Sat, Jan 01, 2011 at 11:03:11PM +0100, Robin Gareus wrote:
On 12/31/2010 10:03 PM, Philipp Überbacher wrote:
I'd be interested in this as well.
`man 2 mlock` - preventing memory from being paged to the swap area.
that's needed to prevent stalling audio-applications because they're
swapped out.
What's the difference between jack1 and jack2 mlocking? Announcing this
as feature for tschack hints that jack1's implementation is "better" - why?
jack2 only mlocks the port memory.
but it never calls mlockall, which makes sure, that everything is locked
into memory.
Excerpts from torbenh's message of 2010-12-30
16:30:33 +0100:
[snip]
>>>
>>> get it here:
>>> http://hochstrom.endofinternet.org/files/tschack-0.120.1.tar.gz
>>> http://hochstrom.endofinternet.org/files/PyJackd-0.1.0.tar.gz
>>
>> Not sure what half of that means :)
>> One thing I think you forgot to mention but might be of interest is
>> jack-session support
>
> right. jack-session is supported. but thats what jack1 and jack2 also
> support nowadays.
There's support for it in both jack1 and jack2 SVN, but there's no
official release where it is enabled by default.
well....
which of the features is unclear ?
Oh, I thought there is no jack1 release with jack-session yet, dunno
about jack2.
>> features:
>> - jack1 mlocking
Means for a user?
TIA,
robin
>>>> - controlapi which works even when libjackserver.so is loaded
RTLD_LOCAL
>
> Means for a user?
>
>>>> - smp aware
>>>> - backendswitching
>
> Means for a user?
>
>>>> - strictly synchronous like jack1. (-> no latency penalty)
>
> Async (jack2?) has a latency penalty?
>
>>>> - clickless connections.
>>>> - shuts down audio processing when cpu is overloaded for too long.
>
> I guess most users don't know very much about the technical details of
> the jack implementations.
>
> _______________________________________________
> Linux-audio-user mailing list
> Linux-audio-user(a)lists.linuxaudio.org
> http://lists.linuxaudio.org/listinfo/linux-audio-user
--
torben Hohn
25 Jan
25 Jan
12:26 p.m.
Excerpts from torbenh's message of 2010-12-28 16:57:14 +0100:
hi...
since jack1 release is taking pretty long, i decided to stop waiting
with a tschack release.
tschack is an SMP aware fork of jack1.
its a dropin replacement like jack2.
features:
- jack1 mlocking
- controlapi which works even when libjackserver.so is loaded RTLD_LOCAL
- smp aware
- backendswitching
- strictly synchronous like jack1. (-> no latency penalty)
- clickless connections.
- shuts down audio processing when cpu is overloaded for too long.
i also released PyJackd which is a wrapper around libjackserver.
features:
- commandline for backendswitching
- pulseaudio dbus reservation.
get it here:
http://hochstrom.endofinternet.org/files/tschack-0.120.1.tar.gz
http://hochstrom.endofinternet.org/files/PyJackd-0.1.0.tar.gz
Hi Torben, I just noticed that the wiki is out-of-date:
http://hochstrom.endofinternet.org/trac/tschack/wiki
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linux-audio-user@lists.linuxaudio.org
9 comments
4 participants
participants (4)
-
Jörn Nettingsmeier -
Philipp Überbacher -
Robin Gareus -
torbenh