Pd-list August 2011

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readanysf~ buzzing problem
by James Dunn 30 Oct '11

30 Oct '11

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help browser resize + guiplugins organization
by Charles Goyard 18 Oct '11

18 Oct '11

Hi list, I'm learning pd (so far the only serious thing I did is a video source selector for live/playback/blackout display cropped in a circle), so I spend a lot of time in the help browser. Today I ended up frustrated by how small is that window. So I modified help_window.tcl to be able to resize it vertically. Then I turned it in a guiplugin. Here's the oh-so-complex code as a guiplugin: # let the user decide the size of the help browser bind HelpBrowser <Map> { wm resizable .help_browser 0 1 pack .help_browser.frame -expand 1 } (Just wondering: why is this window fixed size in the first place ?) Also I had a more general question about these plugins: is/will there be some place to centralize them or should every bugger like me post snippets on the list ? Cheers, -- Charlot

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Arduino UNO how-to in puredata.info
by Pierre Massat 17 Oct '11

17 Oct '11

Hi all, I've created a page in the Documentation folder to help arduino UNO owner fix their board if they need to use it in Linux (assuming that Pd users who need an interface to control Pd also need low-latency, and most probably use a linux machine). It's here : http://puredata.info/docs/GettingArduinoUNOToWorkInLinux/ Mr. Steiner helped me with the formatting! I think it lacks a link to Pduino, at least. Please let me know if you think that this really doesn't fit in the website. I believe it does. Cheers! Pierre

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Re: [PD] dub chords in Pd
by Marco Donnarumma 11 Oct '11

11 Oct '11

Yes, check this: http://soundcloud.com/bemong/03-rhythm-sound-mango-drive well, the whole tune, specially at 3' 05" so those are the dub chords I'm talking about :P Sorry for not specifying before, Thanks, Marco From: brandon zeeb <zeeb.brandon(a)gmail.com> > Subject: Re: [PD] dub chords in Pd > To: PD List <pd-list(a)iem.at> > Message-ID: > <AANLkTikiVQU9S2jP+YBa55A68HjRW7Cti7ZrSSP6q7K_(a)mail.gmail.com<AANLkTikiVQU9S2jP%2BYBa55A68HjRW7Cti7ZrSSP6q7K_(a)mail.gmail.com> > > > Content-Type: text/plain; charset="iso-8859-1" > > There are many ways to peel that apple, can you post an example of > something > similar to what you're aiming for? > > Cheers, > ~Brandon > > -- Marco Donnarumma aka TheSAD Independent New Media Arts Professional, Performer, Teacher Ongoing MSc by Research, University of Edinburgh, UK PORTFOLIO: http://marcodonnarumma.com LAB: http://www.thesaddj.com | http://cntrl.sourceforge.net | http://www.flxer.net EVENT: http://www.liveperformersmeeting.net

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Gemnotes
by Ed Kelly 29 Sep '11

29 Sep '11

Gemnotes 0.1 - a real-time music notation system for Pd-Extended. Read the blog and get the tarball here: http://sharktracks.co.uk/site/ This is at very much an alpha stage, but it is a working system. Many changes will occur before the next version. Enjoy, Ed Metastudio 4 for Pure Data - coming soon! Metastudio 3 still available at http://sharktracks.co.uk/puredata

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auto-completion with popup [was: 3 new gui-plugins]
by yvan volochine 21 Sep '11

21 Sep '11

hiho I got the popup thing working with auto-completion =) thanks to hc for the help and inspiration http://puredata.info/community/projects/software/auto-completion-plugin enjoy ! as usual, bug reports are welcome (I didn't test the popup on osx/win...) cheers, _y

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[soundtouch~] pitch shifter for Pure Data
by katja 16 Sep '11

16 Sep '11

Hello, A few weeks ago I was reminded of my promise to share [soundtouch~], a SoundTouch port for Pure Data. I use this class since quite some time now, and had the code available on my website earlier on, but when I found that it could not work for Linux 64 bit I withdrew the project for a while. Reportedly, Olli Parviainen's newest version of SoundTouch is ready for 64 bit. I can not check this as I have no access to a 64 bit machine at the moment. Anyway, I have built [soundtouch~] binaries for OSX(fat), Linux32 and Windows32, and uploaded it together with source and help patch: http://www.katjaas.nl/pitchshift/soundtouch~.html SoundTouch is a time domain pitch shift / time stretch library, and I've built it into [soundtouch~] as a real time pitch shifter. It is suitable for the transposition of material with simple harmonic content, like voice, flute etc. The SoundTouch library is not perfectly adapted to real time processing, because you have to choose (at compile time!) between a build which produces dropouts during pitch factor change, and a build which has increased latency. I opted for the clicks instead of the increased latency (which is by necessity already considerable) in my binaries distribution, but if you want you can recompile according to your preference. To solve this clicks-vs-latency issue, if possible at all, would require a modification of the SoundTouch library itself. Apart from this issue, I'm fairly content with [soundtouch~]. Let me know what you think about it. If [soundtouch~] is considered a useful addition to existing Pd methods for pitch shifting, it may be worth the effort to try and solve the clicks-vs-latency issue. It is not a trivial task though.This time I'm not promising anything. Katja.

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notes/questions from a beginner
by Stephen Lavelle 15 Sep '11

15 Sep '11

I've tried getting into around with pd a couple of times before, this is my first concerted time. I've worked with a bunch of flow-charty programming environments in the past (Unreal Engine's kismet is the slickest I've come across - http://odedge.com/forums/ut3_kismet_04.jpg ) - pure data is taking a bit of getting used to (most of this is due to the fact that it does special things, some things feel a bit more avoidable, other things feel frivolously subjective :P ). Here're some of the things that stuck out for me (some might be due to ignorance on my part, I'd love to have things cleared up :) ): 1 - Inlets/outlets too small for me to accurately click on (touchpad) - checking on pd-dev, they can be visually reskinned, but their actual clickable size can't be changed. [ so I guess this one has been responded to, but might as well repeat it ] 2 - If I have an object selected (that's to say pressing buttons to edit text in it) I can't find any key-combination that will delete it - I have to deselect it, then press the mouse down on it, then, while holding the mouse button down, press backspace? (this is an uncomfortable manipulation on a laptop w/ touchpad) - on OSX at least, a shortcut like cmd+backspace would be quite idiomatic for this. 3 - I can drag lines from outlets to inlets, but not from inlets to outlets. 4 - is there a shortcut for deleting connections? something like ctrl+click would save me a lot of time. 5 - is there a way to type numbers directly into a number box? clicking+dragging, or pumping them in via a message, doesn't feel good to me. 6 - shortcut for opening help of selected item would be...convenient for me I'm still working through the tutorials, and am enjoying the experience overall :)

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Re: [PD] Dynamic patching with audio - review
by abel.jerome＠free.fr 15 Sep '11

15 Sep '11

Hi, A new report of my researchs about audio dynamic patching techniques. The continuation of my previous reviews : http://abel.jerome.free.fr/pd/dynamic-patching/reviews/DynamicPatching_revi… http://abel.jerome.free.fr/pd/dynamic-patching/reviews/DynamicPatching_revi… =================================================== Pd-list archives =================================================== "The issue has been discussed several times" (IOhannes m zmoelnig) That's right. I've just seen that the "pd dsp O/1" method was described in 2005 ! It's quite difficult to find those threads without the terms "dsp tree" or "dsp graph" or "dsp chain". Indeed, I don't know anything about it. A list of the best search terms could help us (see below) and avoid those "noise" requests. We are trying here to make a review of all dynamic patching techniques to make it easier to understand and find the "best" solution for any project. It could be a page on the community website instead of the disheartening "do not use dynamic patching" (http://puredata.info/docs/tutorials/TipsAndTricks#how-to-avoid-audio-drop-o…). - Search engine usage ---------------------------------------- When I search in the pd-list, the score show some posts where the search term are in the next or previous message links, not in the message body. How limit the search term to the body and not the links ? Futhermore, if I'm interested in one thread, it seems that if I choose to sort by thread, it's only the threads of a month. How group one thread on all months ? - Search terms ---------------------------------------- "audio drop-outs with pd dsp O; pd dsp 1" "activate audio abstraction" "dynamic audio abstraction" "dynamic patching" "dynamic patching techniques" "update dsp-tree" "update dsp-graph"ofxPd - Threads about audio dynamic abstraction in pd-list ---------------------------------------- - [PD] strange behavior upon loading dsp abstraction.... http://lists.puredata.info/pipermail/pd-list/2004-12/thread.html#24337 - [PD] no dsp-chain update after dynamic abstraction-creation http://lists.puredata.info/pipermail/pd-list/2005-06/028923.html - [PD] slowly load a pd-patches/abs without dropouts http://lists.puredata.info/pipermail/pd-list/2007-01/046243.html - [PD] this is crazy http://lists.puredata.info/pipermail/pd-list/2008-01/059244.html - [PD] API for manipulating a patch in real time http://lists.puredata.info/pipermail/pd-list/2008-12/066723.html - [PD] Dynamically created signal object bug http://lists.puredata.info/pipermail/pd-list/2009-02/068246.html - [PD] abstraction creation audio engine start http://lists.puredata.info/pipermail/pd-list/2009-04/069849.html =================================================== Dynamic creation of audio abstractions =================================================== - Methods ---------------------------------------- 1 - DSP 0/1 2 - Add/clear an audio object (subpatch) 3 - Add/cut any object (subpatch) See : http://abel.jerome.free.fr/pd/dynamicPatching/patchs/dyn-audio-abstraction/ This methods work with any abstraction. - DSP 0/1 method - explanations ---------------------------------------- >From IOhannes m zmoelnig : "You shouldn't dynamically create abstractions while dsp is running, as it slows down significantly." "If dsp is on, and you dynamically create 10 objects in one go (in zero logical time), then the dsp graph will be re-calculated 10 times. If you turn dsp off, then dynamically create 10 objects as before, then no dsp graph will be evaluated until you turn dsp on again, summing up to exactly 1 time. Furthermore, it guarantees that the entire DSP graph is calculated and not only parts of it (because of buggy implementations)" Thanks a lot for those explanations. It's clear enough to see why choose these method even if internal processes in the DSP graph are still incomprehensibles. - DSP 0/1 method - Some questions ---------------------------------------- --- With one audio abstraction. If we create just one audio abstraction at one time. Is it still the best solution or is it the same than other methods ? --- Audio clics. >From me: But audio clics may occur for all sounds, not just for the new one, right ? >From IOhannes: "no, this is wrong. (at least not, if you computer is fast enough to calculate the DSP-graph within the buffertime)." I don't understand how you can not heard clics with it. With my system, audio clics occur... Wrong settings ? Do I need a recent computer ? In fact, a clic is heard the first time with Jack/Alsa and always with Alsa and Asio4all. But in a dynamic patching case, what's this first time ? In the dynamic patch example, clics occurs even if I use Jack/Alsa. See : http://abel.jerome.free.fr/pd/dynamic-patching/patchs/cpu-on-off/screenshot… http://abel.jerome.free.fr/pd/dynamic-patching/patchs/dyn-audio-abstraction… --- Time response depends on audio system If I want a cross-platform system, it couldn't be the best solution. With my computer : WinXP (~ 90 ms), Xubuntu10.04.LTS(~ 20 ms with ALSA, ~0.09 ms with Jack/Alsa), PureDyne9.11+(~ 0.09 ms with Jack/Alsa) See : http://abel.jerome.free.fr/pd/dynamic-patching/patchs/cpu-on-off/screenshot… - Methods without clics [line~] ---------------------------------------- If I can't use audio on/off because of the clics, we need to make prepared abstractions with a [line~] method. The idea is to split methods in two parts: - create/destroy objects - connect/disconnect audio paths (in our case : audio activation) Audio processing methods: - [line~] - [switch~] and [line~] - all audio paths in a [mtx_*~] object which receive audio signals from abstraction and a [send~ $1] in abstrations, where $1 is the unique ID of the abstraction. Communication methods: - global messages - unique message for abstractions : an unique Id in the first argument and a [r $1] in the abstraction =================================================== Dynamic patching : other techniques =================================================== Any feedbacks or projects with those techniques ? - ofxPd --------------------------------------------------- https://github.com/danomatika/ofxPd "Announcing ofxPd, an Open Frameworks addon for running an instance of the Pure Data audio environment within an OpenFrameworks application. Audio, messages, and MIDI events can be passed to and from pure data patches and the library is thread safe. Note: This is not the ofxPd originally released by Damian (see http://forum.openframeworks.cc/index.php/topic,4444.0.html). This is a new addon using the official libpd library. - libpd, Purity, Dyn~, Pdsheefa, Ext13 lib --------------------------------------------------- I wrote some feedbacks about those techniques here : http://abel.jerome.free.fr/pd/dynamic-patching/reviews/DynamicPatching_revi… =================================================== Dynamic patching : some quality specifications =================================================== We could synthesize specifications for a good audio dynamic system in Pd - How many objects must be created in one time - Constraints about the quantity of audio objects - Activate audio (for abstractions) - System with any or prepared abstractions - Avoid audio clics (dsp on/off or line~): delete/create without clics, make connection/disconnect without clics - Dsp chain (update dsp-graph one time) - Best CPU (avoid compute dsp on unused abstractions) - Best time response (dsp 0/1 latency) - Easiest way (less is often better) - Internal messages or Pd exteranls or C/C++ API Jerome

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Announcing CouchPdb development
by Thomas Mayer 08 Sep '11

08 Sep '11

Hello, inspired by the great effort of Louis-Philippe with Puredis, I have started developping a library for another of the NoSQL databases out there, CouchDB. CouchDB is a database with a RESTful interface, i.e. you connect to the database with HTTP requests and depending on the HTTP method you perform the operations. The data you send to CouchDB for storage and the data you receive back from CouchDB are JSON objects, so (more or less) as a lemma, the library also contains objects for encoding and decoding JSON data. The current version is online at https://github.com/residuum/CouchPdb A reason for developping the library is Ubuntu One, as it offers a free 5GB space and includes a CouchDB database. All is in an early stage of development, so do not expect anything to work, it is still very experimental. I mainly uploaded it to Github to discuss a few points, where I do not know how to deal with in a manner fitting Pd, especially when it comes to encoding and decoding JSON data: - How should JSON data be dealt with in general? I am currently just outputting one long symbol separated by spaces, so an object of {"id":1, "name": "my-name"} becomes id 1 name my-name but {"id":1, "name": "my name", "year":2011} becomes id 1 name my name year 2011 and thus breaks the pattern of "key value key value key value". I could output this as list, which would make spaces in values not break the pattern of "key value key value key value" (really?). But is this really a way to represent data in the correct Pd way, i.e. does this data format fit the principle of least surprise? - How should nested objects and arrays be handled? Should they be handled at all? - How to implement attachments (binary files) for data? Or should I forget about this stuff and e.g. store images as base64 encoded strings? I am asking this one in particular, because one application of the object that came into my mind would be a website to upload pictures that are downloaded by a Pd patch in an installation in some gallery, or multiple gallery installations worldwide uploading snapshop images and interacting somehow. Please do not read the code ;) I have not programmed C for ~10 years, and I have never coded anything but simple stuff for university. So actually: Read the code and give me pointers (no pun intended) to problematic code. Best regards, Thomas -- "Prisons are needed only to provide the illusion that courts and police are effective. They're a kind of job insurance." (Leto II. in: Frank Herbert, God Emperor of Dune) http://www.residuum.org/

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Pd-list August 2011