This is a quick guitarix update to cover the new release of jconvolver eg. jconv
guitarix is a simple Linux Rock Guitar amplifier and is designed
to achieve nice thrash/metal/rock/blues guitar sounds.
Guitarix uses the Jack Audio Connection Kit as its audio backend
and brings in one input and two output ports to the jack graph.
To cover the renaming of jconv to jconvolver, guitarix-0.05.3-1
looks now first for jconvolver, if it isn't installed,
it looks for jconv.
Also a patch from Michal Seben (OpenSuse) is added to cover a build fail
at openSUSE:Factory.
Thanks Michal. :-)
Additional, there is a (rt) 2 Channel delay chooser for the output to jconv,
and the Chorus effect work in Stereo now.
have fun
________________________________________________________________________
Project page with screenshots:
http://guitarix.sourceforge.net/
download:
http://sourceforge.net/projects/guitarix/
________________________________________________________________________
For capture, guitarix uses the external application
'jack_capture' (version >= 0.9.30) written by Kjetil
S. Matheussen. If you don't have it installed,
you can look here:
http://old.notam02.no/arkiv/src/?M=D
For extra Impulse Responses, guitarix uses the
convolution application 'jconv' created by Fons Adriaensen.
If you don't have it installed, you can look here:
http://www.kokkinizita.net/linuxaudio/index.html
I(hermann) use faust to build the prototype and will say
thanks to
: Julius Smith
http://ccrma.stanford.edu/realsimple/faust/
: Albert Graef
http://q-lang.sourceforge.net/examples.html#Faust
: Yann Orlary
http://faust.grame.fr/
guitarix is licensed under the GPL.
regards
Hermann Meyer & James Warden
------------------------------------------
Am Donnerstag, den 03.12.2009, 14:04 +0100 schrieb Hartmut Noack:
> hermann schrieb:
> > I'm happy to announce a new guitarix release
> >
> > guitarix is a simple Linux Rock Guitar amplifier and is designed
> > to achieve nice thrash/metal/rock/blues guitar sounds.
> > Guitarix uses the Jack Audio Connection Kit as its audio backend
> > and brings in one input and two output ports to the jack graph.
>
> Nice one, thatnk you :-)
>
> I love to see this project grow - a simple works-right out of the box
> amp for Linux is extremely welcome.
> BTW: do you think, you could turn it into a LV2-plugin?
>
> Some people could consider then to boost stability and performance of
> their Linux audio system by dropping VST via WINE....
>
Thanks Hartmut, good to hear that you like it. :-)
Make guitarix a LV2-plugin, is at least a question of development power.
We would love that to, but, Guitarix is a young small project, we are
only 2 developers, and we both have at first other tasks in mind witch
we wone implement.
In fact, it will be easy for a bit experienced LV2 developer to port the
"control chain" of guitarix to LV2.
Our source is spiked with comments witch make it easy to jump in and
grep the needed source.
Guitarix is a open Project, open for developers who wone join the
project.
gruß hermann
Hi everyone,
I just started writing my first c++ program, and I'm kind of stuck with
something I cannot understand. After a few days of trying to figure this
out, I decided to ask for more professional help. I'm working on a kind
of arpeggiator for linux (which I intend to release under GPL).
The program uses a text file, in which the user can specify a number of
arpeggios. Each arpeggio is loaded into an object called 'Arp',
and for every Arp I make a jack port, and a ringbuffer.
(the port and ringbuffer are stored in an object called Arp_jack)
A seperate thread, watches the text file for modifications (using
inotify), and every time the file is changed, the file is loaded afresh,
and the new Arps are put in the respective ringbuffers. The ringbuffers
have a size of two Arps, and the idea is that when a new Arp arrives,
the old one is discarded. If there is only one Arp in the buffer, the
program keeps on reading the same one.
This code is part of the inotify thread:
while (i < len)
{
struct inotify_event *event;
event = (struct inotify_event *) &buf[i];
if ( event->wd == wd )
{
vector<Arp>* arps = new vector<Arp> ;
read_load_file( arps ) ;
for( uint x = 0; x < arps->size(); x++ )
{
const char* arp_char = reinterpret_cast<const char*>(&(*arps)[x]);
jack_ringbuffer_write( (*ARPS_JACK)[x].rb, arp_char, sizeof( Arp ));
}
//delete arps ;
}
The next code fragment comes from the process callback. As you can see,
I'm using jack_ringbuffer_get_read_vector to read the raw data, and I
advance the the read pointer when a new arp is available:
if( (jack_ringbuffer_read_space( (*arps_jack)[i].rb ) ) ==
(sizeof( Arp ) * 2) )
{
jack_ringbuffer_read_advance( (*arps_jack)[i].rb, sizeof(Arp) ) ;
}
if( (jack_ringbuffer_read_space( (*arps_jack)[i].rb ) ) ==
sizeof( Arp ) )
{
jack_ringbuffer_data_t data[2] ;
jack_ringbuffer_get_read_vector( (*arps_jack)[i].rb, data ) ;
if ( data[0].len > 0 )
{
arp = reinterpret_cast<Arp*>( data[0].buf ) ;
steps = &arp->steps ;
scale = &arp->scale ;
}
else if( data[1].len > 0)
{
cout << "data in second part of ringbuffer, this should not
happen!" << endl ;
}
....
Now to the question. The code works as I expect, as long as I don't
delete the vector of arps in the inotify thread (see the commented
line). When I do delete the vector, the program segfaults.
(and also when I allocate the vector on the stack, and it gets cleaned
up automatically)
I thought that writing to the ringbuffer with jack_ringbuffer_write
copies the data to the ringbuffer, so I don't understand why this should
have an influence. Is it a problem that I put the ringbuffer in
an object which is accessed by two different threads without using a
mutex? I've tried using a mutex,but I still had the segmentation fault.
Any help with this would be really appreciated.
Thanks for your help,
Lieven
Seing that HDMI interfaces are getting implemented everywhere - a bit
like S/PDIF before that, but now with 8 uncompressed channels @192k and
24 bits - does anybody know what kind frame sizes are used and what the
implications would be for realtime audio-processing? (.. as opposed to
buffering up and re-playing pre-recorded material from a DVD.)
Not that I am aware of anything reasonable to connect to at the
receiving end yet - but who knows, that might change.
On Wed, Dec 02, 2009 at 12:39:27PM -0800, Ken Restivo wrote:
> Does the "partition" parameter in the conf file affect this?
Yes, it determines the minumum partition size that will be
used. The only difference between the two examples I posted
is the value of this parameter, 256 or 4096.
> On the reverbs I've been using successfully with freewheeling
> mode, the "partition" is set to 2048, which is very high compared
> to the setting in the sample reverbs tthat come with jconv.
Which means you will have significant delay. If the reverb is
use as an effect (rather than to recreate real room acoustics)
this could actually be beneficial.
On a single processor machine freewheeling should just work,
and not depend on this paramter.
Ciao,
--
FA
Wie der Mond heute Nacht aussieht !
Ist es nicht ein seltsames Bild ?
lieven moors:
>>
>>> I want to repeat the same Arp, until there is an update to the text file.
>>> One arp is allready
>>> loaded in each ringbuffer in main(). When the file is modified, a second one
>>> is added, and
>>> process skips to the second one. Since I have only space for two arps in the
>>> buffer, there
>>> should always be exactly one which is readable. I know it is a bit weird,
>>> but it seems to
>>> work, apart from the problem I described.
>>>
>>
>> sounds as if you might want to look into atomic pointer and/or integer
>> exchange instead, to get lock-free double buffering.
>>
>> ringbuffers are generally for passing streaming data/events.
>>
>>
> Could you give me a hint on how to use atomic pointers?
I've used the lockless lifo/fifo-queue implementations found in
midishare a few times. Those are really simple to use:
http://midishare.sourceforge.net/
First of all,
Apologies for cross-posting.
If it is not too much of a trouble, I was wondering if I could ask fellow
FOSS enthusiasts to help us in "digging" & "reddit-ing" our L2Ork
announcement posted on reddit and dig earlier today.
Links to the posts can be found below:
<http://www.reddit.com/r/reddit.com/comments/aa12z/who_says_penguins_cannot_
sing_introducing_l2ork/>
<http://digg.com/linux_unix/Introducing_L2Ork_World_s_First_Linux_Laptop_Orc
hestra>
Once again, apologies for the OT nature of this post.
Sincerely,
Ivica Ico Bukvic, D.M.A.
Composition, Music Technology
Director, DISIS Interactive Sound & Intermedia Studio
Assistant Co-Director, CCTAD
CHCI, CS, and Art (by courtesy)
Virginia Tech
Dept. of Music - 0240
Blacksburg, VA 24061
(540) 231-6139
(540) 231-5034 (fax)
ico(a)vt.edu
http://www.music.vt.edu/faculty/bukvic/
I'm happy to announce a new guitarix release
guitarix is a simple Linux Rock Guitar amplifier and is designed
to achieve nice thrash/metal/rock/blues guitar sounds.
Guitarix uses the Jack Audio Connection Kit as its audio backend
and brings in one input and two output ports to the jack graph.
Release 0.05.2-1 comes with some changes:
* remove dependency of the boost library
(Many thanks to "thrasher13b" for the patch)
* fix missing "./" in ./debian/rules reported
by GMag (AV Linux)
* add 2 Channel gain and delay chooser to the
Jconv settings widget.
* add scroll/zoom mode to the wave view
* reworked Jconv settings widget UI
* various GUI and feature clean-up's
have fun
Comments and suggestions are welcome.
________________________________________________________________________
The standalone version of guitarix is based on GTK2+.
But guitarix is also released as a suite of LADSPA plugins
and can be used in e.g. ardour.
guitarix is licensed under the GPL.
Project page with screenshots:
http://guitarix.sourceforge.net/
download:
http://sourceforge.net/projects/guitarix/
For capture, guitarix uses the external application
'jack_capture' (version >= 0.9.30) written by Kjetil
S. Matheussen. If you don't have it installed,
you can look here:
http://old.notam02.no/arkiv/src/?M=D
For extra Impulse Responses, guitarix uses the
convolution application 'jconv' created by Fons Adriaensen.
If you don't have it installed, you can look here:
http://www.kokkinizita.net/linuxaudio/index.html
I(hermann) use faust to build the prototype and will say
thanks to
: Julius Smith
http://ccrma.stanford.edu/realsimple/faust/
: Albert Graef
http://q-lang.sourceforge.net/examples.html#Faust
: Yann Orlary
http://faust.grame.fr/
regards
Hermann Meyer & James Warden
------------------------------------------
guitarix-dev team
hello everyone,
I am trying to write a c++/qt4 jack client which mix 2 inputs and has a jack
output. The problem is that currently jack gets zombified too often and I would
like some info on how can I debug the exact reason this happens. I suspect
it's the way the app is written and I am planning to rewrite it but I need
some advices first.
The way it's currently written makes use of mutexes and locks to pass the
data beetween a custom global buffer. Is this the reason for not synchronizing
good enough and zombifies jack or it's something else that screw things? Should
I use a ringbuffer (which, to my understanding is lock-free and doesn't need
mutexes) to get the work done, and if so, are there any jack2 example of this
or some hints for what I should be aware of? Or have I misunderstand something
completely?
Please, any recommendation of how I can eliminate this "jack zombified" thing
and understand the whole realtime issue is welcome.
Thank you in advance.
Dear fellow Linux enthusiasts and consortium members,
Please allow me to bring to your attention the upcoming L2Ork debut:
On December 4th Virginia Tech DISIS (<http://disis.music.vt.edu>) Linux
Laptop Orchestra (L2Ork, <http://l2ork.music.vt.edu>) will hold its first
sneak preview debut performance on Virginia Tech (VT) campus, Squires Studio
Theatre, starting at 7pm. Admission is free.
At noon on the same day, L2Orkists will also host a demo booth outside the
Commonwealth Ballroom in Squires Student Center (VT campus) demoing how
L2Ork works.
For additional info on L2Ork and a video preview of L2Ork in rehearsal:
<http://l2ork.music.vt.edu>
Facebook Event Page:
<http://www.facebook.com/home.php#/event.php?eid=180832548428&ref=mf>
Sincerely,
Ivica Ico Bukvic, D.M.A.
Composition, Music Technology
Director, DISIS Interactive Sound & Intermedia Studio
Assistant Co-Director, CCTAD
CHCI, CS, and Art (by courtesy)
Virginia Tech
Dept. of Music - 0240
Blacksburg, VA 24061
(540) 231-6139
(540) 231-5034 (fax)
ico(a)vt.edu
http://www.music.vt.edu/faculty/bukvic/
