Linux-audio-dev

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2 participants
7502 discussions

by pshirkey＠boosthardware.com

> On 07/18/2011 04:02 AM, pshirkey(a)boosthardware.com wrote: >>> On 07/17/2011 10:41 AM, Rustom Mody wrote: >>>> On Sun, Jul 17, 2011 at 1:21 PM, Philipp Überbacher >>>> <hollunder(a)lavabit.com>wrote: >>>> >>>>> Excerpts from Rustom Mody's message of 2011-07-17 05:33:44 +0200: >>>>>> I am preparing to give a talk on the wider ramifications of music. >>>>>> One of the things I wish to demonstrate is that things that look >>>>> different >>>>>> are merely analogs but at different scales. >>>>>> >>>>>> eg if something vibrates at 400Hz we hear a sound of A-flat. If it >>>>>> 'vibrates' at 4 Hz we hear a beat. >>>>>> In the same analogy a 2 vs 3 poly-rhythm (should?) change to a do-so >>>>> chord. >>>>>> And so on. >>>>> >>>>> I suggest you do some experiments before you give a talk. At 4 Hz you >>>>> won't be able to hear anything, you won't even be able to reproduce a >>>>> 4 Hz sound with common speakers. >>>>> >>>> >>>> You took me quite literally, [I did put the vibrate into quotes :-) ] >>>> Let me spell out the experiment in more detail: >>>> Say I have a rhythm in 4/4 time -- 4 even quarter notes, bar repeating >>>> every >>>> second played by say a click. [What kind of click I am not very sure; >>>> sharp >>>> with few harmonics would be best I expect] >>> >>> Exactly. Just take a short audio-sample (aka grain) and trigger it >>> repeatedly. Increase the trigger freq. (aka grain-speed) from 4 Hz -> >>> 400Hz. >>> >>> Search the net for granular-synthesis. Your use-case is not the typical >>> grain-synth application, but the principle is the same. >>> >>>> Now if there were some (realtime) way of sliding the tempo from 1 sec >>>> to >>>> millisec I expect the separate clicks would vanish into a hum at some >>>> stage. >>>> >>>> This (and other such experiments) is what I want to demo. >>>> Ive started looking at chuck. >>>> How does it compare with puredata? >>>> >>> >>> It's a bit of an apples vs oranges question. >>> >>> the main difference: Chuck you program in text, pure-data you >>> graphically connect "objects" (if you know Max/MSP: pure-data is >>> similar). >>> >>> AFAIK, Chuck does not offer GUI elements - you'll need to implement the >>> slider via OSC or use a "text slider". >>> >>>>>> Is there some kind of software where I can make a 4 Hz beat and pull >>>>>> a >>>>>> slider or a freq text box entry until it sound like a A-flat note? >>>>> >>>>> puredata springs to mind, it's easy to use and has everything you >>>>> need. >>> >>> Indeed. Though chuck, supercollider, csound,... could all do the trick. >>> >>> If you know neither of those. Pure-data is probably the easiest to get >>> started with. >>> >>> http://www.timvets.net/video/grains.php will do what you want with Pd. >>> >> >> >> I'm not sure that does what he wants. He asked for a tool that takes an >> existing signal/tone and then down tunes it. What you are suggesting >> creates an emulation of that process but generates a completely new >> signal/tone. >> >> It would achieve a similar sound but is functionally quite a different >> process. > > You are right or course. It's not modeling the desired effect correctly; > Yet it's close enough and much more robust and convicing for a Demo. > > Actually http://www.sonicvisualiser.org/ may be the tool of choice. > Here's a video where it is used to slow down some Bach so that you can > hear the "beating/pulsing" introduce by equal-temperament tuning: > http://www.youtube.com/user/mcldx#p/a/u/0/uOOhvw89jc4 > That's an interesting feature of that tool. I was not aware of that functionality. It appears to work on the time domain not the amplitude/phase of the signal. I assume as it uses a similar code base to librubber band to achieve that functionality. IIRC, It is still not quite doing what the original request appeared to be asking for. i.e. down tuning an existing signal. ( He didn't require time adjustment ) Would it just be a case for a pitch shifter with a automation fade curve sone in Ardour/qtractor, etc...? -- Patrick Shirkey Boost Hardware Ltd

13 years, 11 months

IceStream-1.1-beta now!

by APO33

Hi LADs! a new free software is born: IceStream - https://sourceforge.net/projects/icestream/ it's a beta version, we are writing the known bugs & todo, some parts are in french but it is already possible to use it to mix audio streaming, to start an icecast from gui and the to send an audio stream to it or elsewhere. Thanks to mplayer, ices, icecast, vorbis and jack. It works with jackd server and use only ogg for the moment (we don't use mp3 anyway here). Of course, we are looking for beta-tester and more people are also welcome to help, support, develop and more if you want!! mailing list on its way and forum already in place : https://sourceforge.net/apps/phpbb/icestream/ bug tracker to come ;-) cheers Julien -- APO33 space of research and experimentation http://www.apo33.org info(a)apo33.org

13 years, 11 months

LV2 Core: waf configure fails

by Aurélien Leblond

Hello, I can't compile the last SVN (280) version of LV2 core due to an error when I run "waf configure" blablack@igor:~/src/Launchpad/lv2core$ waf configure Setting top to : /home/blablack/src/Launchpad/lv2core Setting out to : /home/blablack/src/Launchpad/lv2core/build Global Configuration * Install prefix : /usr/local * Debuggable build : False * Strict compiler flags : False * Build documentation : False Traceback (most recent call last): File "/home/blablack/src/Launchpad/lv2core/.waf-1.6.6-158eec7a0749a003782d4a9a502e3d08/waflib/Scripting.py", line 94, in waf_entry_point run_commands() File "/home/blablack/src/Launchpad/lv2core/.waf-1.6.6-158eec7a0749a003782d4a9a502e3d08/waflib/Scripting.py", line 146, in run_commands run_command(cmd_name) File "/home/blablack/src/Launchpad/lv2core/.waf-1.6.6-158eec7a0749a003782d4a9a502e3d08/waflib/Scripting.py", line 139, in run_command ctx.execute() File "/home/blablack/src/Launchpad/lv2core/.waf-1.6.6-158eec7a0749a003782d4a9a502e3d08/waflib/Configure.py", line 127, in execute super(ConfigurationContext,self).execute() File "/home/blablack/src/Launchpad/lv2core/.waf-1.6.6-158eec7a0749a003782d4a9a502e3d08/waflib/Context.py", line 87, in execute self.recurse([os.path.dirname(g_module.root_path)]) File "/home/blablack/src/Launchpad/lv2core/.waf-1.6.6-158eec7a0749a003782d4a9a502e3d08/waflib/Context.py", line 127, in recurse user_function(self) File "/home/blablack/src/Launchpad/lv2core/wscript", line 36, in configure autowaf.define(conf, 'LV2CORE_PATH_SEP', lv2core_path_sep) File "/home/blablack/src/Launchpad/lv2core/.waf-1.6.6-158eec7a0749a003782d4a9a502e3d08/waflib/extras/autowaf.py", line 63, in define conf.define(var_name,value) AttributeError: 'ConfigurationContext' object has no attribute 'define' Is anybody else facing the same issue? Thanks in advance, Aurélien

13 years, 11 months

Re: [LAD] LV2 Core: waf configure fails

by Aurélien Leblond

>> instead of >> waf configure >> run: > > ./waf configure >> from root directory of the zip (trunk), not from core.lv2 directory. > >This would certainly do it. That you even have a system installed waf >is very odd... > >The build system is entirely self-contained, you only need Python. > >Please let me know if this was the problem. You do need to use the >included ./waf Using ./waf didn't solve the problem. I'm doing it from the core.lv2 directory because I'm creating packages for Ubuntu. If I come back to the SVN revision 273, it works fine. Since 274, I can't do "./waf configure" from the core.lv2 directory. (doing it from the trunk directory works though...) Hope that helps, Aurélien

13 years, 11 months

AlsaModularSynth and LV2

by Aurélien Leblond

Hi everyone! I have been using AlsaModularSynth for the past several years and I just love the sound of its internal modules... But AlsaModularSynth is a bit old looking, and it doesn't support LV2... On the other hand, Ingen looks brilliant, but I have never been able to recreate what I was able to do with AMS... I always had some weird issues to set a simple VCO/VCA/VCF setup... I see two solutions to that problem : - integrate LV2 to AMS... - extract the AMS internal modules and create LV2 plugins from them... >From the quick study I have done of the AMS source code, that second solution seems "quite simple" (as quite simple can be!), but I have few questions before I start on this quest : - first of all, would porting the AMS modules to LV2 change the sound? - is it actually possible to do it? Or did I miss something? - what is the future of Ingen? Altough it has be around for a while, it is never available in official repositories of Ubuntu for example... Is Ingen more meant to be testing LV2 plugins or can it be uses as a proper modular synth? I believe only Ingen and AMS have this modular way of creating synthesis? - hmm, anything else I should consider? Thanks in advance for the help, Aurélien

13 years, 11 months

Just released libsndfile-1.0.25

by Erik de Castro Lopo

Hi all, I've just released version 1.0.25. Main thing is a fix for Secunia Advisory SA45125, a heap overflow in the PAF file parser. Since the heap was getting overwritten with zeroes, there is little that an attacker can acheive other than causing a program that uses libsndfile to segfault. Secunia suggest remote system access is possible: http://www.securelist.com/en/advisories/45125 but I call bullshit. Secunia also join my shit list for going public with this a week early that they originally stated, meaning I had to rush this release out. The rush of the release means the windows builds have not been tested as thoroughly as I would have liked. As usual, its available from: http://www.mega-nerd.com/libsndfile/#Download Cheers, Erik -- ---------------------------------------------------------------------- Erik de Castro Lopo http://www.mega-nerd.com/

13 years, 11 months

Re: [LAD] a small jack-session extension, proposal - was: Feature requests: add JackSession support

by Emanuel Rumpf

2011/7/11 Renato <rennabh(a)gmail.com>: > On Sun, 10 Jul 2011 19:43:53 +0200 rosea grammostola wrote: >> On 07/10/2011 06:33 PM, Emanuel Rumpf wrote: >>> >>> http://wiki.linuxaudio.org/wiki/user/emrum/jack_session_2_draft >>> >> Good job. I added some comments. Thank you. >> > > just wanted to notify that one of the "additional ideas" is asking > support for multiple sessions, while one of Emanuel's > "conclusions" (first bulleted list, third item) says that this is now > possible but should actually not be, as it could be an error-source. > I am for/pro multi-session, IF it is completely reliable, works without hassle (including user-handling) and doesn't complicate implementation too much. That might be possible. Eventually. The current behavior, to me, feels strange and unexpected, though: Opening a running session (twice) opens another set of windows. What's that ? Do I have a "doubled" session now ? It is very opaque, unclear, which window belongs to which session. Is that how it should be, is that what we'd want ? I'm adding a new section to the wiki page, "(Multi-) Session Handling". -- E.R.

13 years, 11 months

Feature requests: add JackSession support

by rosea grammostola

Linux Audio Developer, May I make a feature request here for your Linuxaudio application(s)? Could you please add JackSession support? It makes working with JACK standalone applications a lot more user friendly. There are some apps who support it already and they work fine, like Yoshimi, Qtractor, Pianoteq, Ghostess, Guitarix, Jack-Rack, Ardour3, Bristol, Seq24, Jalv, Ingen, Connie, Specimen and probably more. It is possible to use applications without JackSession-support in a session (via so called infra clients), it starts the applications, make the connections, but doesn't save the state. So obviously it would be far more useful if those applications would get JackSession-support also. Qjackctl is able to work as Session Manager, so is Pyjacksm (and likely Patchage in the future). According to comments on IRC by Paul Davis, it's very easy to add JackSession support to your application. "Its really easy, just handle 1 more callback from the server. Torben's walkthrough shows what is necessary." Torben's walktrough: http://trac.jackaudio.org/wiki/WalkThrough/Dev/JackSession Thanks in advance, \r

13 years, 11 months

Jack Session Manager: feature request

by rosea grammostola

Hi, It is very promising that devs like Torben, Paul Davis, Rui and David Robillard (to name a few), are 'backing up' Jack Session and that the Jack Session API is in the Jack API. This will give the community a very good chance that many apps will get JackSession support soon (or later). However, it's still reasonable to expect that not all LAD applications are going to be patched with JackSession support. In other words, there are and will be apps which might be useful (for one or more of us) to use in a session but which won't have JackSession (JS) support. From a users perspective, it would be very useful to be able to use that application (without JS support) in a session in some way nevertheless. At the moment one Session Manager (SM), Pyjacksm (Qjackctl will follow soon, and also Patchage I expect) makes this possible by manually adding 'infra clients' to a configuration file, .pyjacksmrc. See example below. Infra clients are designed for applications without a state, like a2j. But it is also possible to use apps without JS support as infra client. Amsynth is an application without JS support and in this way I am able to load amsynth, with project A. The SM makes sure that Amsynth is started and that the Jack connections are restored (that's the only thing the SM can do for you for apps without JS support). But I don't want to use Amsynth with Project A always (Session 1). I might be working on a totally different project and want to make a session for that also (Session 2). This time I want to load amsynth as: amsynth -b /home/user/projectB.amSynth.presets (I don't use Session 1 and 2 together in this example). To be able to load Session 2, I have to edit my .pyjacksmrc file or make symlinks. *Feature request*: It would be nice if the SM could provide me a way to load a different configuration file. For example: JackSessionManagerX --load configurationfileSession2 Thanks in advance, \r .pyjacksmrc: [DEFAULT] sessiondir = ~/linuxaudio/JackSession [infra] a2j = a2jmidid -e amsynth = amsynth -b /home/user/projectA.amSynth.presets configurationfileSession2: [DEFAULT] sessiondir = ~/linuxaudio/JackSession [infra] a2j = a2jmidid -e amsynth = amsynth -b /home/user/projectA.amSynth.presets

13 years, 11 months

[LAA] [ANN] guitarix release guitarix2-0.17.0

by hermann

guitarix/gx_head is a simple guitar mono tube amplifier simulation. please refer to our project page for more information: http://guitarix.sourceforge.net/ new features in short: * fixed jack session support * add amp-model (push/pull) * add amp-model (feedback) * fix build/runtime issue on OSX * reformat source to the Google C++ Style Guide conventions * some minor fixes and maybe new bugs have fun _________________________________________________________________________ guitarix is licensed under the GPL. screen-shots and sound examples: http://guitarix.sourceforge.net/ direct download: http://sourceforge.net/projects/guitarix/files/guitarix/guitarix2-0.17.0.ta… download site: http://sourceforge.net/projects/guitarix/ please report bugs and suggestions in our forum: http://sourceforge.net/apps/phpbb/guitarix/ ________________________________________________________________________ For extra Impulse Responses, gx_head uses the zita-convolver library, and, for resampling we use zita-resampler, both written by Fons Adriaensen. http://kokkinizita.linuxaudio.org/linuxaudio/index.html We use the marvellous faust compiler to build the amp and effects 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/ ________________________________________________________________________ For faust users : All used Faust dsp files are included in /gx_head/src/faust, the resulting .cc files are in /gx_head/src/faust-generated The tools we use to convert (post-processing and plot) the resulting faust cpp files to the needed include format, stay in the /gx_head/tools directory. ________________________________________________________________________ regards guitarix development team

13 years, 12 months

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Linux-audio-dev