Pd-list February 2013

pd-list@lists.iem.at

106 participants
200 discussions

Simple Kalman filter
by Joel Matthys 02 Mar '13

02 Mar '13

I just completed a very simple 1D Kalman filter Pd external. I haven't really done any documentation on it, but it seems pretty robust for cleaning up 1D sensor inputs. The source is here: https://github.com/jwmatthys/kalman-pd Joel

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create/access udp sockets from within pd
by Matthias Blau 02 Mar '13

02 Mar '13

Hi list, is there a way in pd to send/receive udp packets via sockets? The problem at hand is to control an Outline ET250-3D turntable from within pd. This turntable can be controlled via udp, which works in principle by using mrpeach's udpsend. Unfortunately, the table responds to a different port every time a udp packet is sent to it, which means that udpreceive and friends will not receive the answer, as they listen to pre-defined ports. One can however communicate via sockets, i.e. in python, the solution is: ---- from socket import * ServerIP = 'xx.xx.xx.xx' Port = 6667 data = bytearray([4, 0, 0, 0]) # command to query table position client_socket = socket(AF_INET, SOCK_DGRAM) client_socket.sendto(data, (ServerIP, Port)) recv_data, addr = client_socket.recvfrom(2048) recv_data= [elem.encode("hex") for elem in recv_data] ---- Is this possible in pd as well? Or, as an alternative, how would one use a python function from within pd to accomplish this? Thanks, Matthias

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wireless audio from Pd to PA system
by katja 01 Mar '13

01 Mar '13

For a wearable live performance computer, I am looking into the options of sending wireless audio from Pd to a PA sound system and other listeners. In a first experiment I've tried a Linex FM transmitter. Audio quality is good enough, and FM transmitters do not introduce latency. This option is cheap and flexible, as the signal can be received by simple radio's, which are even built into cell phones and media players. I would need to boost the transmission a bit to make it more reliable. This will of course make the equipment illegal. Even then, the risk that someone else is transmitting a stronger signal on the channel can not be excluded. Another option could be to send audio over Wifi. This would require WLAN to be available, and one extra computer (with audio interface) as a receiver. To avoid extra latency the audio should be sent uncompressed, like [udpsend~] / [udpreceive~] can do it. This has the risk of packet loss and serious dropouts. I've been searching for 2.4 GHz wireless music receivers and found things like this: http://www.sitecom.com/en/wireless-music-streamer/wl-061/p/203. They seem to act like external soundcards for your computer. In Linux though I've never managed to properly connect multiple soundcards with Pd (in OSX it's easy using the Aggregate Device Editor from Audio MIDI Setup). Also I guess these devices introduce huge latency. With audio over bluetooth headsets I've experienced latencies up to a second. Does anyone use a satisfactory method in practice, to send audio from Pd without wires? Thanks, Katja

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tooltip rfc
by Jonathan Wilkes 28 Feb '13

28 Feb '13

Ok, I have a plan to revise the tooltips that are in pd-ext 0.43 * put enter/leave logic on the c-side. This is what pd-l2ork does and it results in easier, more predictable mouseover behavior. * have autotips appear based on mouse position. This is what tooltips do in most other programs (and how it works in Pd-l2ork). * separate out the "manual" tips that appear in the corner of the canvas. This can be used by tutorials, independent of the autotips, as well as by objects like [pddplink] to show where the link navigates to in a Firefox-style. (These can also appear/disappear regardless of the edit-mode status.) * add a "INLET_n_DESC" tag in the [pd META] for objects that want a one to two word description of what an object does. That way a tooltip over the middle inlet of [clip] can tell you it expects the "low value", in addition to the fact that it expects a float. * fix the bug that makes the tooltip font too small on Windows And a little more complicated: * Add some kind of standard "assist" or "tip" method which can be called by the tooltip so an object can provide dynamic data about itself or its xlets. Example: 1) User mouses over the right inlet of [float] 2) Pd triggers the tooltip function 3) The tooltip function checks if that object has an "assist" method, and if it does it calls it. 4) The assist method for [float] sees from its args that the right inlet tooltip was triggered, so it returns the message "42" which is the value stored at the right inlet. 5) Pd calls the tk proc to draw the tip, which could look something like: Inlet1- stored value (42) - float Question is: what args should be expected to the "assist" method? Does it just need to know whether the object, inlet, or outlet tooltip was triggered, plus xletno? What's the best way for the "assist" method to return the values? I'm guessing an array of atoms but I'm not sure. -Jonathan

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GUI Overload - Update
by Ed Kelly 27 Feb '13

27 Feb '13

Hi list, An update on the sys_pollgui() fix Miller passed me... It did work for abstractions within a single patch, but today I loaded two such GOP GUI intensive patches at once. The GUI seized up like it did before. One of my abstractions changes the color of GUI elements as it's playing, and that showed the new state of the GUI element as the color was changed. That's all I have. Cheers, Ed Gemnotes-0.2: Live music notation for Pure Data, now with dynamics! http://sharktracks.co.uk/

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Gem newbee question/antialiasing of edges on "boxes"
by jamal crawford 27 Feb '13

27 Feb '13

hi list i found this picture http://daimi.au.dk/~vectral/html_gallery_1/pics/Image_00227.jpg which is done in max/jitter on osx and i wonder how do you get them "soft" edges/lines on them "boxes", if its possible at all. when I create a cube or any other 3d object it has that "grainy" look. Does it have anything to do with the OS/hardware its been running on? best regards ./jc -- http://www.fastmail.fm - mmm... Fastmail...

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Re: [PD] Gem newbee question/antialiasing of edges on "boxes"
by jamal crawford 27 Feb '13

27 Feb '13

hi alpha did the trick thanks From: IOhannes m zmoelnig <zmoelnig(a)iem.at> Subject: Re: [PD] Gem newbee question/antialiasing of edges on "boxes" To: pd-list(a)iem.at Message-ID: <512DD598.3050806(a)iem.at> Content-Type: text/plain; charset=ISO-8859-15 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 darn, my mailer ate the content of my last mail. so here we go again... On 2013-02-27 00:42, jamal crawford wrote: but it seems like polygon_smooth does nothing. obviously, you have to insert [polygon_smooth] *before* your Geos (e.g. your boxes). less obviously, you also might want to insert [alpha]. gamsdr IOhannes -- http://www.fastmail.fm - Same, same, but different...

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Controlling / looping a list of audio files loaded in by reading a text file.
by Rick T 27 Feb '13

27 Feb '13

Greetings All I'm trying to control how a text file with a list of audio files in it are read/played. Example: I have a text file which is read and plays several audio files one right after the other till the end. I would like to have it read/play the text file list in reverse, forward, or loop play on the current file. So if I have a text file with. one.wav, two.wav three.wave When a button is clicked for Forward it reads the text file and plays the audio files like: one.wav two.wav three.wav When a button is clicked for Reverse it reads the text file and plays the audio files like: three.wav two.wav one.wav When a button is clicked for Loop it reads the text file and plays the audio files like: one.wav two.wav two.wav two.wav .... until I cancel the loop or hit another button to go forward or reverse I've gotten the buttons to work as a selection but I'm having issues in getting the text list to change directions and loop. I was thinking of using a list to read in all the lines in the text file but I wasn't sure how to get the list to read/play in the forward, reverse, and loop options. Is their another way I should be trying to do this? I've attached what I have so far. Thanks

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[PD-announce] Call for Collaborators | Future Tools. Interactivos?'13 workshop on Libre Graphics
by Medialab-Prado Comunicación 27 Feb '13

27 Feb '13

Dear list members, We would like to inform you about this new call for collaborators to participate in the development of prototypes of open source tools for graphic design in the context of an international workshop. Feel free to spread the word. Thanks for your support! Medialab-Prado team Call for Collaborators. Interactivos?'13 Tools for a Read-Write World Open call to collaborate in the project development workshop Interactivos?'13: Tools for a Read-Write World (April 15 - 27, 2013 in Madrid, Spain). Collaborators will participate in the production of selected projects, aimed at the creation of tools to design, edit, draw and write together. This edition focuses on (re)inventing a Libre Graphics workflow that supports collaboration and exchange Medialab-Prado offers free lodging to collaborators in a Youth Hostel during the workshop (limited seating). This call is part of the Libre Graphics Research Unit project and is preceeded by the international event Libre Graphics Meeting (April 10 - 13, 2013). Collaborators can also take part in the meeting. Registration is required. Advisors: Libre Graphics Magazine editorial team (ginger coons, Ana Carvalho and Ricardo Lafuente); Comunes Collective - KUNE collaborative software (Vicente Ruiz Jurado, Samer Hassan) and Jennifer Dopazo. Curated by Femke Snelting (LGRU, Constant). Organizer: Medialab-Prado (Madrid City Council). Deadline: April 9, 2013. Free registration. More information and submission form: http://medialab-prado.es/article/convocatoria_colaboradores_lgru -- Nerea García Garmendia Comunicación / Press Medialab-Prado Intermediae Matadero Madrid Paseo de la Chopera, 14 28045 Madrid (Temporary Location) Tel. +34 915 177 288 difusion(a)medialab-prado.es www.medialab-prado.es http://www.facebook.com/MedialabPradoMadrid Twitter: @medialabprado _______________________________________________ Pd-announce mailing list Pd-announce(a)iem.at http://lists.puredata.info/listinfo/pd-announce

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denormals from [cyclone/svf~] on Linux 64 bit
by katja 27 Feb '13

27 Feb '13

Since last week I have my own Linux 64 bit machine. One of the first issues with Pd-extended on this machine was a strongly increased CPU load when audio input is temporarily shut off from parts of my patch. Subnormals! After three hours of puzzling I identified at least one offender: [cyclone/svf~]. Sorry that most of my posts to this list seem to be about subnormals. That's quite boring. But they're seriously hogging my CPU time like a swarm of grasshoppers. As I got this 64 bit machine so recently I don't know if the issue with [cyclone/svf~] exists in earlier Pd-E versions. Also, I can not understand why it happens, because the object is protected against subnormals with function PD_BIGORSMALL(). This works well on all my other systems. Moreover, it works well for other feedback delay objects like [lop~] on Linux 64 bit. I'd like to know if anyone can confirm the issue. I was planning to do my own state variable filter anyway, but it would be nice to have a working [cyclone/svf~] as well. Check the object with attached patch if you can. To be specific, I have the issue with Pd-E 0.43.4 for Debian Squeeze amd64 from nightly builds. The i386 build is not affected. Katja

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Pd-list February 2013