Pd-list September 2007

pd-list@lists.iem.at

140 participants
258 discussions

Re: [PD] derivative?
by Oded Ben-Tal 04 Sep '07

04 Sep '07

DPCM is Differential pulse code modulation, and its possible to get an estimate of derivative with the right predictor. While the difference between the last two messages is an approximation of the derivative its is a really bad one so extrapulating on 4-points is much better. (dsp theory is really not my area but I'm sure some people will be able to explain much better about dpcm) What I'm looking for is a way to: (1) store the last 3 values in the series. (2) an estimate of the derivative should be x0 - 1/2 * x1 - 1/4 * x2 -1/4 * x3 (where x0 is the most recent element) (3) switch places so the x0->x1 x1->x2 x2->x3 ready to do it again. I'll try looking at list-abs (I think I tried poking around those on my office mac but pd-extended couldn't find them so I left it at that). thanks

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why does this patch click?
by Atte André Jensen 04 Sep '07

04 Sep '07

Hi Total newbie here, sorry. Half way through the 3.audio.examples directory, I decided to take a break and play a bit around. This generated the attached patch. However it gives "DIO errors" with accompanying click every few seconds, although I can't figure out what I did wrong. NB: It needs the adsr and output abstractions found in 3.audio.examples. -- peace, love & harmony Atte http://atte.dk | http://myspace.com/attejensen http://anagrammer.dk | http://atte.dk/compositions #N canvas 602 134 304 338 10; #X obj 67 41 notein; #X obj 67 129 phasor~; #X obj 67 89 mtof; #X obj 67 176 *~; #X obj 66 217 output~; #X obj 125 129 adsr 1 5 500 0 500; #X connect 0 0 2 0; #X connect 0 1 5 0; #X connect 1 0 3 0; #X connect 2 0 1 0; #X connect 3 0 4 0; #X connect 5 0 3 1;

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A basic question re: messages and sequencing
by Mat Wall-Smith 04 Sep '07

04 Sep '07

Hi.. I've been working in PD on a project and I have two message boxes with a list of numbers. I want to divulge the common numbers into a message or sequence. How best to do that? My second question is how best to write a sequence with those numbers to a file with time information coming from another list (message) again? thats probably clear as mud - if anyone has time to help I'd appreciate it. Mat

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possible [pack] bug
by Hans-Christoph Steiner 04 Sep '07

04 Sep '07

Hey, I found something in [pack]'s handling of symbols that seems like a bug to me. If [pack symbol ...] receives a message with just a selector, then it treats it as if it was a symbol. I.e. this packs a symbol: [test( <--this works | | [test( <-- this throws an error | | [pack symbol symbol] Whad'yall think? .hc ------------------------------------------------------------------------ ---- I spent 33 years and four months in active military service and during that period I spent most of my time as a high class muscle man for Big Business, for Wall Street and the bankers. - General Smedley Butler

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derivative?
by Oded Ben-Tal 03 Sep '07

03 Sep '07

Does anyone know of a patch/object that calculates the derivative of an incoming sequence of messages (not signal)? I am trying to figure out a way of calculating the derivative (by DPCM) but all I can come up with are very cumbersome and ugly (keeping the last 4 values and then switching their positions ready for the next iteration works in c, but seems awkward in pd) I presume there is a simple elegant way of doing it but I just can't see it. Thanks Oded -- ___________________________________________________ Oded Ben-Tal http://ccrma.stanford.edu/~oded oded(a)ccrma.stanford.edu

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mp3live~ connection lost too little input
by mami music 03 Sep '07

03 Sep '07

Hi i´m getting this error stream connected. connection lost (too little input) stream connected. connection lost (too little input) stream connected. connection lost (too little input) stream connected. connection lost (too little input) on the pd window of the remote computer when sending a stream over the internet using the mp3streamin~ object. It actually reproduces the sound but in an intermitent way, with silences. Is it problem of the network? any clues on how can i solve this and have a decent smooth stream? maby using other objects? ah, im working on windows can there be any incompatibility issue? thanks daniel

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Re: [PD] [PD-dev] PD externals/extras/OSC and RT and JACK
by Ken Restivo 03 Sep '07

03 Sep '07

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Sun, Sep 02, 2007 at 03:25:24PM +0200, IOhannes m zmoelnig wrote: > Ken Restivo wrote: > > > I just realized that it *almost* works. > > > > The JACK devices are definitely created at the time that PD starts up. > > > > But no sound comes out until I choose the "Test Audio and MIDI" window, and click on -20 or -40, and get a tone, and then click OFF. > > > > Only *then* will audio come out of any other patches that might be loaded, even if I can see from number boxes that the patches are definitely running. > > > you hae to turn the audio-engine on in order to hear something. > there is a little checkbox in the main pd-window that says "compute > audio", try enabling that... > btw, this should be explained in the docs (if it is not, i think it is a > serious omission) > I didn't see it. Nor did I see mention of any command-line flag to eliminate this requirement, i.e. to have the audio-engine start up when the program is launched. > > > PS: i think it would be nicer to limit each email to just one (group of) > question(s); as you can see by the answers so far, people seem to split > it up anyhow, but the subjects and bureaucratic organization completely > screws up. and pd-dev vs pd-list and... > Thanks. I was looking for a pd-discuss list, and didn't find one, but I'll use pd-list from now on. - -ken -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQFG21DEe8HF+6xeOIcRAnvUAJ4utNEpnMqg92nU9QeD8otSu8pwSQCcCUQ9 62cc0lO8EoGKC68xl/w8I2o= =2Xd1 -----END PGP SIGNATURE-----

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playback noise with video
by Oded Ben-Tal 03 Sep '07

03 Sep '07

I am getting noise and disruption to audio stream when I am using gem's pix_movie object. The noise happens only when I 'run' the movie. most of the time its in 'freeze frame' mode with some movement of the graphic objects (translation, rotation) and that works fine with the audio. But when Gem needs to play the movie I get audio problems. I am running it on a brand new G5 mac with 4gb RAM, and dual processor, which I thought should be enough processing power to run smoothly. Any ideas about ways of reducing this problem? I am trying to use dufferent encoders for the quicktime movie and, I think, some are worse than others, but I don't know enough about the differences to make any inform decisions. Anyone knows more about how Gem handles movies? Is it possible to set the system priorities on OSX to give audio higher priority? Any other ideas? thanks Oded

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Re: [PD] some images...
by Koray Tahiroglu 03 Sep '07

03 Sep '07

This might be abit late reply, I just got finally online through my neighbour's open wi-fi. Thanks to all who made this wonderful convention possible, I had great time during the convention and it was nice to meet you all face to face. hope to see you next time as well. koray. ------------------------------------- M.Koray Tahiroglu Media Lab,UIAH http://mlab.uiah.fi/~korayt/ tel: +358 50 939 02 33 ( in Finland only) tel: +90 533 712 8245 On Aug 28, 2007, at 1:00 PM, pd-list-request(a)iem.at wrote: > Message: 5 > Date: Mon, 27 Aug 2007 22:52:44 -0400 > From: "David Merrill" <dmerrill(a)media.mit.edu> > Subject: Re: [PD] some images... > To: "Kevin McCoy" <km.takewithyou(a)gmail.com> > Cc: PD-list(a)iem.at, reduzierer(a)yahoo.de > Message-ID: > <f86d2a880708271952k34e0238r33eb27446a5e4bdd(a)mail.gmail.com> > Content-Type: text/plain; charset="iso-8859-1" > > Yes, it was great go see/meet everyone! Huge thanks to the > organizers, who > did a lot of work to plan such a nice series of events over the > week. The > chance to meet people who were previously just names on the pd-list > was > perhaps the most important part of the event, and I think this > mingling and > sharing of ideas fired up much enthusiasm amongst all the > developers and > users in attendance. Hope to see everyone again next time, > -David M. > > On 8/27/07, Kevin McCoy <km.takewithyou(a)gmail.com> wrote: >> >>> (who's sad, that is already over) >> >> Me too - it was a really awesome time and I am so thankful to all the >> organizers and the great people we met. Montreal is a really nice >> place and I can't wait to come back. I am going to be working on the >> footage that I took with Greg Pond and we might have something to >> show >> in the next couple of months, maybe sooner. Should be fun. >> >> And Roman, email me and let's do a NetPD jam when you have some time >> back home! I have been experimenting with the patches a little bit. >> >> Kevin >> >> _______________________________________________ >> PD-list(a)iem.at mailing list >> UNSUBSCRIBE and account-management -> >> http://lists.puredata.info/listinfo/pd-list >> > > > > -- > MIT Media Lab > dmerrill(a)media.mit.edu > http://web.media.mit.edu/~dmerrill/ >

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question about getdir(Guenter Geiger)'s code
by Thomas O Fredericks 02 Sep '07

02 Sep '07

Thanks to Han's help page (http://puredata.info/docs/developer/mingw) I was able to compile a test external on windows with mingw. I then started making a new external called getdollarzero based on getdir (from ggee) and parentdollarzero (from iemlib2). I compiled it and it works but I had to: 1) remove Guenter's hack from getdir's source code 2) and therefore include g_canvas.h My question is the following: why is there a hack in the first place? If I do not use it will my code crash PD in some way (I compiled against PD 0.4and worked fine during testing)? As a reference, here is my code with the hack commented out : --------- getdollarzero -------- #include "m_pd.h" #include "g_canvas.h" //needed to include g_canvas.h once the hack was commented out /* HACK struct _glist { t_object gl_obj; // header in case we're a glist t_gobj *gl_list; // the actual data struct _gstub *gl_stub; // safe pointer handler int gl_valid; // incremented when pointers might be stale struct _glist *gl_owner; // parent glist, supercanvas, or 0 if none }; END HACK */ typedef struct getdollarzero { t_object x_ob; t_canvas * x_canvas; t_outlet* x_outlet; int x_level; } t_getdollarzero; static void getdollarzero_bang(t_getdollarzero *x) { int i = x->x_level; t_canvas* last = x->x_canvas; while (i>0) { i--; if (last->gl_owner) last = last->gl_owner; } // code example taken from iemlib2's parentdollarzero: // x->s_parent_unique = canvas_realizedollar((t_canvas *)this_canvas->gl_owner, gensym("$0")); // original get dir function: //outlet_symbol(x->x_outlet,canvas_getdir(last)); outlet_symbol(x->x_outlet,canvas_realizedollar(last, gensym("$0"))); } t_class *getdollarzero_class; static void *getdollarzero_new(t_floatarg level) { t_getdollarzero *x = (t_getdollarzero *)pd_new(getdollarzero_class); x->x_canvas = canvas_getcurrent(); x->x_outlet = outlet_new(&x->x_ob, &s_); x->x_level = level; return (void *)x; } void getdollarzero_setup(void) { getdollarzero_class = class_new(gensym("getdollarzero"), (t_newmethod)getdollarzero_new, 0, sizeof(t_getdollarzero), 0, A_DEFFLOAT,0); class_addbang(getdollarzero_class, getdollarzero_bang); } --------- getdollarzero end -------- -- thomas ouellet fredericks, tof(a)danslchamp.org, montreal, canada

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Pd-list September 2007