Pd-list February 2011

pd-list@lists.iem.at

121 participants
193 discussions

[PD announce] timbreID spectrograms
by William Brent 17 Feb '11

17 Feb '11

Hi, If anyone needs to plot spectrograms, I just updated the timbreID examples with improved plotting patches. The old patches used structs, which were really really slow to draw. The new ones rely on GEM and are much more useable. You can plot cepstrograms as well. I also recently added a classic vocoder patch based on a Bark-spaced filterbank. You'll need the latest version of timbreID for all of this to work. If you're interested, the library & example patches can be downloaded in separate packages here: http://williambrent.conflations.com/pages/research.html#timbreID -- William Brent www.williambrent.com “Great minds flock together” Conflations: conversational idiom for the 21st century www.conflations.com

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OpenNight and FLOSS Hackday - Sunday 27th Feb @ the Others.
by Robert Munro 17 Feb '11

17 Feb '11

The next openlab hackday and opennight next Sunday 27th Feb @ the Others ( http://www.theothers.uk.com). This is Android and general open-source multi-media salon where people can come along and hack, present works or generally cross-pollenate ideas. So people developing musical/video/graphics/tech art/etc apps can get together and have ideas, intents, providers, broadcasts ... The event in the evening is a freeform event comprising of basically any music/video/art you can make using at least some open-source software/ Android app. So the idea is that you can hack away on some instrument/app during the day and perform with it at night - if you so desire.. Anyone is welcome to come along and present their projects, or ideas and information as well as work/hack with yours or other projects. So if it sounds as good to you as it does to me then maybe you should consider putting ur name up on the WIKI: http://www.pawfal.org/openlabwiki/index.php?page=OpenNight ** *12-7 pm: FLOSS & Android Hackday* The plan at the moment is: About 12-1p: People who want to can get up and give a brief... outline what they are working on / looking for. Then in the rest of the time we can intersperse hacking with presentations and discussions as and when people are ready. We could fix a time but i think it might be good to have different breaks during the day. ** *6 or 7pm - 11pm : OpenNight* Confirmed so far : Rob Munro Phil Jones Ryan Jordan More to come ... or just send me a message... venue website: http://www.theothers.uk.com/

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GEM - edge blending and polygon smooth
by rainer _ 16 Feb '11

16 Feb '11

hi, i´m currently working on a patch for a multiscreen / multiprojector installation. I know, probably vvvv is the better choice to do this - but first i want to try it with GEM. i started with two screens, two pd instances, two gemwins framesynced over netsend/receive on one machine. for edgeblending i use pix_takealpha and a matching tif with alpha channel. at this point the first question appears: is there an object in GEM to adjust gamma and can elevate blacklevels ??? for a rudimental imagewarping i textured the whole thing on a 4-point polygon. the next problem: on excessive warping poor edges appears on texturing - i´ve tried polygon_smooth but it seems that it does not do anything...is there a more elegant way to get smooth imagewarping??? thanks & best regards, rainer p.s. i´m still on GEM 0.90

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Art installations using PD?
by Jeff Sandys 16 Feb '11

16 Feb '11

I plan to give a one hour intro to PD during the NorthWest LinuxFest, with the focus on programming for artists. I would like some examples of Art Installations using Puredata, either audio, graphic or video, performance or exhibit. If you have pictures or videos of a PD art exhibit, please send them to me. I am not looking for the code, though if you have an example it might be useful, I am looking for pictures or videos of the exhibit, preferable with art lovers enjoying it. Thanks, Jeff Sandys

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Abstractions x Externals
by Alexandre Porres 16 Feb '11

16 Feb '11

> Btw-- the manual makes a distinction between > "abstractions" and "externs". But it shouldn't, right? I mean, it's not real in practice, for abstractions can be externals... porres

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"select folder" object?
by David Schaffer 16 Feb '11

16 Feb '11

Hi there, I'm a big "openpanel" fan, really... But I as wondering if there was such thing as a "select folder" object. It would come handy in some of my patches when I'm trying to tell pd what folder it has to look into to find audio files. Up to know, I'v done this by using "openpanel" and some symbol/list management functions, but there must be a simpler way... Thanks for your answers. D.S http://www.flickr.com/photos/schafferdavid/ http://audioblog.arteradio.com/David_Schaffer/

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Re: [PD] Scheduling events, libpd, and sequencing
by Peter Kirn 16 Feb '11

16 Feb '11

On Wed, Feb 16, 2011 at 5:23 AM, Jamie Bullock <jamie(a)postlude.co.uk> wrote: > Can't the caller just communicate with Pd by passing messages through the libPd API? I thought the whole point of libPd was that you have your code and Pd's code running in the same process, with a lightweight wrapper in between, so there should be virtually zero latency in passing messages from your code to a running Pd. Certainly it shouldn't require timestamping to de-jitter. Or maybe I'm missing the point of your question... Yes, that's exactly correct. Honestly, what prompted this for me was a great deal simpler -- I was annoyed at the inability to process lists with qlist and textfile directly. ;) So, if I have my code logic calculating the sequence of events and then passing those into Pd as messages, I'd be inclined to do so through a list; I was just having to break up that list and add a bunch of 'set' commands at the beginning, and it makes for extra logic in the patch that looked ugly. Usually when that happens, I try to double-check that I'm not missing something. Frank wrote -- > Actually I think, Pd is great for scheduling (musical) events, so I'd not put that into the interface code. The Pd side is probably, where the musicians and composers work and they are the ones who need to deal with sequences, timing, rhythms etc. And yeah, Frank, I agree with your points about syncing GUI / app time to Pd's clock. That's actually probably unnecessary for most applications, but for those in which you do need to verify precisely when an event happened (a game). I meant only that I was moving the sequencing *logic* outside Pd, which allows the use of Pd to be more generic. Then you let Pd simply be the event scheduler, and your UI and app logic do the work of deciding the sequence, but not the clock-specific scheduling of any of the events in that sequence. And hence I'm passing off lists back to Pd (not huge lists, but nonetheless) I think this conversation largely answers my questions. The difference between what I've been doing and what the Rj scene player we have included with libpd does was that I didn't necessarily want to patch the Pd sequencing logic, but instead leave that as generic as possible in order to allow myself (and others) to try out ideas in their code, in Java or C++ or whatever. Peter

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iSight, pix_video, Mac Books Pro and Pd-extended 0.42.5
by Vj Clouds Eleven 16 Feb '11

16 Feb '11

Dear list, I encounter a strange problem on Mac Books Pro and Pd-extended 0.42.5. On 2 out of 3 tested machines [pix_video] worked fine - but one machine denies working :-( Working Machine (Intel): OS X 10.6.6, MacBookPro2,2 2,33 GHz - built in iSight [pix_videoDarwin]: height 320 width 240 [pix_videoDarwin]: SG channnel Device List count 3 index 2 [pix_videoDarwin]: SG channnel Device List DV Video [pix_videoDarwin]: SG channnel Device List IIDC FireWire Video [pix_videoDarwin]: SG channnel Device List USB Video Class Video error: [pix_videoDarwin]: SGSetChannelDevice returned error -9408 ... you might be able to track this down from the Find menu. [pix_videoDarwin]: vdigName is Built-in iSight [pix_videoDarwin]: digitizer rect is top 0 bottom 1200 left 0 right 1600 [pix_videoDarwin]: active src rect is top 0 bottom 1200 left 0 right 1600 error: [pix_videoDarwin]: could not set SG Rect [pix_videoDarwin]: set SG NormalQuality [pix_videoDarwin]: using YUV Working Machine (PPC): OS X 10.5.8 PowerBook G4 12" V6,2, 1 GHz - ext. FW400 iSight [pix_videoDarwin]: height 320 width 240 [pix_videoDarwin]: SG channnel Device List count 3 index 1 [pix_videoDarwin]: SG channnel Device List DV Video [pix_videoDarwin]: SG channnel Device List IIDC FireWire Video [pix_videoDarwin]: SG channnel Device List USB Video Class Video error: [pix_videoDarwin]: SGSetChannelDevice returned error -9408 ... you might be able to track this down from the Find menu. [pix_videoDarwin]: vdigName is iSight [pix_videoDarwin]: digitizer rect is top 0 bottom 1200 left 0 right 1600 [pix_videoDarwin]: active src rect is top 0 bottom 1200 left 0 right 1600 [pix_videoDarwin]: set SG NormalQuality [pix_videoDarwin]: using YUV Not working machine (Intel): MacBookPro3,1, OS X 10.6.6, 2,4 GHz - built in iSight: [pix_videoDarwin]: height 320 width 240 error: [pix_videoDarwin]: could not make new SG channnel error -9405 ... you might be able to track this down from the Find menu. I found a message on the Pd mailinglist which suggests to send 'colorspace rgba' followed by a 'reset' (message is here: http://lists.puredata.info/pipermail/pd-list/2004-02/017454.html) This did not work out for me and leads to: [pix_videoDarwin]: colorspace is GL_RGBA 6408 error: [pix_videoDarwin]: SGStop failed with error -9402 [pix_videoDarwin]: starting reset error: [pix_videoDarwin]: could not make new SG channnel error -9405 Any ideas what goes wrong? Any idea what the error numbers should tell me? /c11

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Re: [PD] Scheduling events, libpd, and sequencing
by Peter Kirn 16 Feb '11

16 Feb '11

> You accidently had html-mail switched on. :) Argh. Stupid Thunderbird. > In this context qlist and textfile are eqivalent: qlist is just a textfile with > a metro/delay and a sender already built in. Both objects do things inside of > Pd and the metros work with subsample accuracy. I don't think, you can take > them as a model for communication with external processes: Once the file is > loaded into a textfile's or qlist's memory, there's no communication with the > outside world (network, harddisk, other processes) happening anymore. Ah, okay, that's good to know. I guess my main question was, what's the best way to send event lists from the language to either of these objects? > I think, a better model for realtime interaction might by OSC with timetags. Right, but in an embedded context (i.e., pd embedded in another language), OSC seems to me to add unnecessary overhead. See above question. > qlist can send lists just fine. Both qlist and a textfile with sender/outlet > and metro-timing simply send Pd messages like floats, symbols, lists, etc. > It's up to the composer to define, what's describing an event and what > describes a sequence. Right, uh, but that's the *output* from those messages. (I don't think either can receive as flexibly as that.) The notion is that the language side of things - Java, C++, Objective-C, Python, whatever -- will have the logic that determines how events are scheduled, and would handle user input that might alter the sequence of those events. The question is how best to have the *language* communicate with Pd. So, the structure would be: external logic > message to Pd > qlist/textfile scheduling inside Pd > sound source in Pd > audio callback in the embedded instance We'd continue to use libpd, but rather than assuming the Pd patch contains logic for how the events are scheduled, those would be integrated with the logic and interface contained in the code. (So, on iOS, for instance, in Objective-C or something.) Am I making a bit more sense? I was just unsure how best to handle (and recommend to others how to handle) the interface between Pd and the outside world, if Pd is acting in real-time but responding to changing sequences from code written elsewhere, outside the logic of the patch. Peter

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Re: [PD] noob question: trying to repurpose the G08.reverb.pd example
by Jonathan Wilkes 16 Feb '11

16 Feb '11

It's still a common vocabulary. You're not rewriting the abstractions (or renaming them) every time. And in your case why not just have the several different patches all be in the same folder with the abstractions? -Jonathan

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Pd-list February 2011