Rubber Band Library v1.5.0 is now available.
http://breakfastquay.com/rubberband/
This release adds a key-frame mapping facility for managing variable
stretch ratios within a single offline time-stretch pass, plus a more
reliable transient detection mode for soft instruments and
band-limited transient detectors to improve performance with
compressed or lower-quality material. It is source and binary
backward compatible with v1.4, though code written for v1.5.0 may not
work with v1.4 (the new release adds one new function and one new
enum).
Chris
Apologies for cross-posting...
Dear Colleagues and fellow computer music enthusiasts,
On May 30th 1pm-7pm EST @ NYC Resistor L2Ork will hold a one-day workshop on building Linux-based laptop orchestra and unique opportunities such an ensemble brings about.
Synopsis:
L2Ork is an ultra-affordable tool for handling administrative logistics associated with starting a new Linux-based laptop orchestra using exclusively free software and cost-efficient hardware. The workshop will cover general issues in regards to starting a Linux-based laptop orchestra, as well as provide an opportunity for the workshop participants to engage in writing for L2Ork. The workshop will also cover L2Ork's latest initiative to bridge STEM (Science, Technology, Engineering and Math) and Arts in K-12 education and funding opportunities such a project may bring about.
Participants will learn about:
* administrative and logistical prerequisites for starting a Linux-based laptop orchestra
* design considerations in designing and building adequate infrastructure (speakers, soundcard, system configuration and optimization)
* streamlining Linux platform
* optimizing Pure-Data software for GUI-based networked performances
* ensuing creative opportunities of a networked laptop orchestra
* design strategies and standards developed for writing pieces for the L2Ork ensemble
* education-based opportunities attained through L2Ork's ultra-affordable infrastructure
* logistical considerations in building GUIs for a diverse group of performers with widely varying amount of musical training and experience
* wiimote strategies for an ensemble-oriented performance
* strategies for incorporating soloists into the L2Ork ensemble
Participants will be given access to:
* all L2Ork's resources, including custom code and Pure-Data abstractions designed specifically for the orchestra and its input devices
* customized Pure-Data software platform with performance, editor, and GUI enhancements
* access to software repository containing optimized Linux kernel and supporting software as well as turnkey Linux setup containing an entire hard-drive image of the L2Ork Linux system
* detailed list of parts necessary to build L2Ork-compatible ~$250 hemispherical speakers and a ~$750/seat turnkey setup including a laptop, external soundcard, wiimote & nunchuk, headset, cables and accessories, and a custom hemispherical speaker.
All participants will be also given an opportunity to interact with L2Ork members (performers and researchers alike) as well as submit their own works for programming consideration by the L2Ork ensemble.
For a more detailed overview and registration info please visit:
http://icmc-workshop-l2ork.eventbrite.com/
NB: please note that the times listed on the aforesaid site are in Pacific Time.
For additional info on L2Ork, please visit http://l2ork.music.vt.edu.
Should you happen to have any questions, suggestions or concerns, please do not hesitate to contact me.
Ivica Ico Bukvic, D.M.A.
Composition, Music Technology
Director, DISIS Interactive Sound & Intermedia Studio
Director, L2Ork Linux Laptop Orchestra
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/
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Hi all,
For all those who could not make it to Utrecht: LAC2010 is just about to
start here.
Live A/V streams are already online - thanks to Joern -at
http://streamer.stackingdwarves.net/
Remote participants are invited to join #lac2010 on irc.freenode.net, to
be able to take part in the discussions, ask questions, and get
technical assistance in case of stream problems...
The Conference Schedule in online at:
http://lac.linuxaudio.org/2010/?page=program
ciao,
robin
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Hello,
I'm still trying to develop my boxy-sequencer idea. Basically, I've tried
out a couple of algorithms for window-manager-like box placement within a
grid and run into big problems.
Because I need help/advice/ideas, I'm posting here as it has some
relevance, and I've also posted to
http://stackoverflow.com/questions/2746590/fast-block-placement-algorithm-a…
A quick run down of what's happened so far, the two algorithms:
The first I directly based on Fluxbox's Row Smart placement algorithm.
Testing only the data structures, (and with gcc -O0) jack kicked out my
client after around 200 boxes were placed in a 128x128 grid. I then
counted how many times the algorithm looped through the entire list of
boxes and discovered (not in RT for this) that the 256th box placement
required around 14000 scans through the list of 255 previously placed
boxes (i've decided 256 boxes will be the worst-case-scenario).
The second algorithm consists of a freebox data structure which represents
a rectangular area of free unused space. It also forms a node in a doubly
linked list, as well as four directional links to other freeboxes touching
it (with a maximum of one freebox touching each side of a freebox)...
turns out rather complex to implement fully: 700+ loc for a partial
implementation of row-smart left-to-right top-to-bottom placement - theres
also col-smart, r-to-l, b-to-t and all combinations.
Through stackoverflow, I've come across spatial hashing.
I wondered if anyone here uses this technique for the display of data
(would scrollable window views use such a thing?). worth it for a 128x128
grid etc?
I'm just after any general thoughts/insights you might have as to what
might or might not work. Anything worth pursuing.
I'm afraid there's all sorts of little things to be considered so if you
do have something to suggest, please read the stackoverflow post first.
Cheers for any help, if possible,
James.
Although my provider's spam filter still blocks linux audio mails, I'm
happy to announce my novation launchpad midi driver.
It is not a driver in the common sense, but a user space usb application
which offers a midi out and in to write and receive launchpad midi messages.
On my distribution(gentoo) I needed to add myself to the usb group to
run this application.
Download it from: http://krampenschiesser.de/launchpadd-0.1.tar.bz2
Dependencies:
I know the dependencies are quite fat(boost) but this driver is part of
my sequencer application, and I just want to give launchpad owners the
possibility to use their pad.
boost >= 1.41 (need threads, signals2, foreach)
libusb-1.0
alsa
pthreads
To build the whole stuff you need cmake(>=2.6).
Installation:
$ tar -xjf launchpadd-0.1.tar.bz2
$ cmake
$ make
$ sudo make install
$ launchpadmidid
To uninstall use :
$ xargs rm < install_manifest.txt
I would be very happy to get some feedback from the users and developers.
Coming from the Java world this is my first(finished) project in c++ and c.
And I didn't know anything about USB before...
So if there is a developer who has got a good knowledge of c/c++ or usb
interrupt transfers it would be great if he could have a look at the
code, especially the method handleWriteTransfer in LaunchpadImpl(.cpp)
is a point where I'm not that sure about the interrupt handling(although
it works as it is right now).
If there's anyone using this application on a kernel <=2.6.27 please
inform me(as the polling changed with this version).
Hi everyone,
I think this CfP might interest some of the people on this list:
http://www.hindawi.com/journals/asp/si/mart.html
We welcome contributions from various related audio development areas,
as you will be able to see from the call, there is a wide scope in it.
all the best
Victor
hi all,
On Thu, Apr 29, 2010 at 7:05 AM, Tim E. Real <termtech(a)rogers.com> wrote:
>
>
> Just a request: Would be awesome as a DSSI plugin so that we
> don't have to use rakarrack in a 'send and return' loop within our apps,
> which causes latency due to the round trip...
> Tim.
>
>
This raises a question that I've had for a while regarding latency in the
JACK graph. I may have even asked it in the past, but if I did I either
wasn't satisfied with the answer or have forgotten it completely. Either
way, I'm unable to find it in the archives.
My understanding is that connections between applications in the JACK graph
should add absolutely no additional latency to the signal path. Latency is
of course introduced at the A/D and D/A conversion stage of the graph, which
is to be expected. This is the latency figure that jack reports - the
latency introduced at every A/D or D/A stage. The only additional latency
introduced is by processing internal to any applications, for example by the
use of sample blocks as in the case of convolution.
Am I correct in this? If so, then I don't understand Tim's statement above,
as there should be no difference, in terms of latency, between using
Rakarrack as a plugin (if it were possible) within an application, or
placing it in an external send/return loop in the JACK graph.
If my assumption is not correct, then I'm actually highly confused as to
what the value of JACK is at all. If latency were introduced at every
additional JACK signal routing, then even a simple routing like the
following:
A/D -> Rakarrack -> Jackrack -> Ardour -> D/A
would have no less than four multiples of the internal JACK latency. This
would quickly become unworkable in more complex JACK graphs (for example
asymmetrical graphs would have signal chains running with different internal
latencies). This would make having application interconnects a pointless
exercise in frustration for the most part. And actually, from experience,
this is not what seems to happen at all.
Feel free to correct my admittedly limited technical understand of how
latency is handled internally to the JACK graph...
-michael