Pd-list December 2007

pd-list@lists.iem.at

129 participants
239 discussions

PD VideoPedia Project
by giucant 06 Jan '08

06 Jan '08

Dear list, there are many good video stuff out there about pd: tutorials, docs, pieces of art etc... I've also noted this is a good method to start understanding pd (and digital audio as well). What do you think about an 'official' community Youtube channel with original contents and theme-playlists? Original channel contents should be: - videos from pd-conventions - presentations and lessons by developers (Hans, Dr. Pukette etc...) - stuff by goto10 and pure:dyne geeks - other... Theme-playlist should catalog existing (and new) videos in specific categories: - Documentation - Tutorials - DSP - Synth - Phisical computing (arduino...) - GEM - other... Some links to start with: http://www.youtube.com/oggro http://www.youtube.com/miya6611 http://www.youtube.com/vreahli http://www.youtube.com/pidipid http://www.youtube.com/jkantTube (my tube) http://www.youtube.com/view_play_list?p=B3BCCFC9EBFBFAAE (a playlist i've made) What do you think about this project? Are there someone possibly interested in help managing contents? Let me know. Ciao j ___________________________________ L'email della prossima generazione? Puoi averla con la nuova Yahoo! Mail: http://it.docs.yahoo.com/nowyoucan.html

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tabread4~~
by Ypatios Grigoriadis 05 Jan '08

05 Jan '08

Hello everyone! I work with pd for about 3 years. Right from the beginning (or almost..) i ran into the following problem: table look up with [tabread4~] is great for small array but, due to 32bit floating resolution, if the array is of a certain length and longer, look up can not be so exact. The result is distortion. I am not a programmer so i could not find the solution myself. I wrote then to the list and i got feedback for the problem but only info. No practical solution. Thanks to IOhannes there is a new object that takes 2 signals to specify the position for the look up which makes it way more precise (this idea came originally from my professor Gerhard Eckel). [tabread4~~] which you can find in the latest zexy lib. I tested the object but not in many ways yet.... it seems to be stable though. I am also making a small -help patch for the object which i will soon post (if it's ok with IOhannes..) So thank you IOhannes for your time and effort! I am really grateful. (Sorry if i was too greedy the other day about the [vline~~]... but it's all for the Art!!!) -- YpatIOs. ... :-)

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Re: [PD] Pd + asterisk?
by Russell Bryant 04 Jan '08

04 Jan '08

Christian GrÃ¶ger wrote: > Hey, > > thanks for this, I just tried it, it works (kind of)... Thank _you_ for trying it out! >> 1) Install my branch of Asterisk that contains app_jack. >> >> $ svn co http://svn.digium.com/svn/asterisk/team/russell/jack asterisk-jack >> $ cd asterisk-jack >> $ ./configure && make >> $ sudo make install >> >> The jack interface is in apps/app_jack.c in case anyone cares. >> > There was the first problem, app_jack somehow didn't build without any > errors, configure said jack...h was there, but there was no app_jack.so > build. I had to do a 'make menuconfig' and disable+reenable app_jack. Hm, that's odd. The build system should automatically include it if jack was found on the system. I'll have to play around with it to see if it happens to me ... >> 3) Make sure jackd is running. For the sake of efficiency, specify 8 kHz, >> because for most codecs used for phone calls, that's all you get. Also, specify >> 160 frames per period. For 8 kHz audio, this comes out to 20 ms periods, which >> is generally the packet size used for Voice over IP. >> >> $ sudo jackd -d dummy -r 8000 -p 160 >> > I used 128 frames, this sounded a bit better. But I think it would be > much better if app_jack would adapt to the running jack. I sometimes use > jack for connecting to a firewire-soundcard and with 8KHz it's > impossible to have good sound out of your speakers ;) The short answer is that I have all intentions to make app_jack work transparently with any period size and sample rate used by jack itself. Longer response ... In theory, any period size should work just fine. I just happened to choose 160 because I was thinking that it would be more efficient, since that was the period size of packets coming through Asterisk. However, due to the way audio is passed between Asterisk and jack, it really shouldn't matter at all. All of the raw audio goes through ringbuffers that have no concept of a period. I will play around with different period sizes to see if I can cause a problem to occur. Also, I have all intentions to support more than 8 kHz mode for jack. :) The trick is, with 8 kHz, app_jack doesn't have to resample anything. With any other sample rate, it does. I have code that attempts to handle resampling the audio in both directions using libresample. However, it currently makes the audio sound absolutely terrible. I'll get it fixed, though ... >> 4) Make a call to the extension created in Asterisk in step 2. You should see >> the two new jack ports become available. In theory, they are available for >> connection to any application that can use Jack. The only thing I have done so >> far is to use the "patchage" application to connect the ports directly together >> to verify that the audio is flowing correctly. >> > I tried Pd and had some strange problems (I don't know where they come > from) No problem if you connect adc~ from Asterisk to dac~ on Asterisk, > I hear myself with a rather extreme echo. But I can't hear a simple osc~ > on the phone, neither can I hear myself on my PC-speakers when I talk > into the phone. Would you mind sharing the Pd patch that you were using to test this out? The extreme echo is a good sign, I think. I assume you mean you just heard your own voice coming back to you, with some delay. Anything beyond that is probably acoustic echo with whatever phone you're using. :) The reason that connecting Asterisk to itself works but not with anything else could have something to do with the way I did sample value normalization in Asterisk. Asterisk uses a 16 bit integer representation per sample. However, I had to convert it to float for jack. I wasn't sure of the right way to do it, so I simply scaled the values based on the maximum values of the type ... (f_buf is a buffer of floats, s_buf is a buffer of int16_t's) for (i = 0; i < f->samples; i++) f_buf[i] = s_buf[i] * (FLT_MAX / SHRT_MAX); >> Now, to figure out how to hook up arbitrary jack ports to Pd ... if anyone has >> any pointers, it would be much appreciated. I'm still very new to Pd. :) >> >> > You could do this in Asterisk with a System(jack_connect ...) ;) > Do you think it would be possible to tell app_jack to connect to > jack-server running as Pid x? Jack sometimes screws up your system when > it runs as root, or other software does, because it has to run as root > too. I configured my Asterisk to run as myself, but that's quite complex. The System() option is certainly amusing. Hey, if it works, why not. I think what I want to do eventually is be able to send a message that you could receive in a Pd patch that a new pair of jack ports has become available. But, that's not as important to me right now as getting the audio flow working properly. I don't know about adding an argument that says connect to PID X. However, there appears to be an option in the jack C API which allows you to specify a server name to connect to. That may do what is needed to connect to jackd running as a different user. Thanks for the suggestions. > Anyway, it's cool you coded all this, thanks. Thanks for the kind words, and for the testing! Hopefully I can get it working well and make it easy to use. I will work on incorporating your suggestions. -- Russell Bryant

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Re: [PD] complex metronomes sequencing problem
by Libero Mureddu 03 Jan '08

03 Jan '08

Hi Frank, I studied your patch and I substituted the [delay] with [pipe], but, honestly, I wasn't able to find anything wrong there! I also checked by comparing one of the delay-based metros and a proper [metro] of the same speed with timer and they run at the same speed. (see my attached patch). Am I missing something? Thanks, Libero Date: Thu, 27 Dec 2007 18:49:10 +0100 From: Frank Barknecht <fbar(a)footils.org> Subject: Re: [PD] complex metronomes sequencing problem (Frank Barknecht) To: pd-list(a)iem.at Message-ID: <20071227174910.GB19623(a)fliwatut.scifi> Content-Type: text/plain; charset=us-ascii Hallo, Frank Barknecht hat gesagt: // Frank Barknecht wrote: > Maybe you can just make one of the delay-sequencers your master metro, > and encode the periods of the other delays as difference values to > the period of the master. > > Example: You have one master metro at 100. Then you want one > metro/delay A run at 101, another one, B, at 102. For the first bang, > delay A will come 1msec late, so its delay will be 1msec. The next > time, A bangs, it will come 2 msec late, and so on, so A will be n > times 1msec late, modulo 101. For metro/delay B this will be (n*2msec) % > 102. > > Attached is an example for this re-encoding in action. You can use the > master position number box in the to left to jump to a certain > position. (This is not really a IOI approach anymore, though.) Ah, sorry. The math and attachement are wrong here, as the metro will interrupt the scheduled bangs in the delays everytime it bangs. I don't have time for a fix ATM, but maybe you find one on your own. ;) Ciao -- Frank Barknecht _ ______footils.org__

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Text entry in PDa on the N800
by Spencer Russell 03 Jan '08

03 Jan '08

Hey Guenter and list, I just got a nokia N800 handheld internet tablet, and of course the first order of business is to get PD running on it! The package installed without a hitch, and i can run it just fine. I'm stuck on how to enter any text, though. I know it would be silly to do much patching on the device itself, but it would be a nice option to have. any ideas? thanks, spencer

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Pduino&Ping ultrasonic sensor&arduino
by Marko Timlin 03 Jan '08

03 Jan '08

Moi, does anybody know, if it is possible to control the Ping(ultrasonic range finder)sensor using only Pduino (first uploading Pd-firmware to the arduino, and then using the "arduino" pure data patch?). It doesn't work for me at the moment. If I write my own ping-sensor-patch for arduino and then use the PD_inputs_to_PD patch it works fine. But I'd like to use several different sensors and it would therefore be much easier to just control all of them with Pduino and not writing new code for arduino all the time. Well, guess this was the original idea of Pduino anyways :-) MArko

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OT: video camera for detection
by Alexandre Quessy 03 Jan '08

03 Jan '08

Hi, I am shopping for a camera or an installation. :) Detection (pix_blob, etc.) requires a camera with a pretty high resolution, and I also need to be able to disable auto gain control (AGC) and auto iris control (AIC). I guess disabling the auto white balance is a good idea too. I looked at matco.com, which has pretty afordable cameras. Their SX-920C-HR looks pretty good. It has 480 TV lines, which gives more than 720x480 pixels. See http://matco.com/pro-camera-1.htm and click on "Technical details" under that part number to see the little datasheet. I am afraid I cannot disable AGC, though at least I can use a lens which has no auto iris. Is that correct ? Do you guys think there is a way I can disable that auto iris control ? Otherwise, anyone has a camera to suggest ? Thanks a lot ! -- Alexandre Quessy http://alexandre.quessy.net http://www.puredata.info/Members/aalex

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again, the pdcon in brazil issue
by PORRES 02 Jan '08

02 Jan '08

So guys, I will get back to you after the 18th, when we`ll have a meeting here, then I will have some stuff to say... I am about to move to Sao Paulo and maybe get into the doctorate at the State University of sao Paulo, which is interested in sediating and supporting the event. Any great questions or some expectations so far? cheers Alexandre Torres Porres mentalosmosis(a)yahoo.com --------------------------------- Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now.

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slackware installer
by errordeveloper＠gmail.com 31 Dec '07

31 Dec '07

if there any slackware users on this list - you guys are welcome to use my SlackBuild - ftp://ftp.slackbuilds.org/12.0/multimedia/pd/ it had been there since a few weeks already. i have just added it to the list in Downloads section of the community site. cheers. -- ilya .d

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[PD-announce] Pd 0.41 test 10 released
by Miller Puckette 30 Dec '07

30 Dec '07

Pd 0.41-0 test 10 is ready: http://crca.ucsd.edu/~msp/software.html The only major new "feature" in 0.41 is callback scheduling; this got a few new rounds of debugging since test 09. cheers Miller _______________________________________________ PD-announce mailing list PD-announce(a)iem.at http://lists.puredata.info/listinfo/pd-announce

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Pd-list December 2007