Pd-list March 2007

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139 participants
278 discussions

Re: [PD] Compilation of externals on Mac-Intel
by Thomas Grill 18 Mar '07

18 Mar '07

Am 18.03.2007 um 16:33 schrieb Luigi Rensinghoff: > > only max files right now on the beta-server, right ? no, there are pd_darwin files as well, but they are only built and tested against Python 2.3 which is shipped with OSX. greetings, Thomas -- Thomas Grill http://grrrr.org

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Re: [PD] Compilation of externals on Mac-Intel
by Luigi Rensinghoff 18 Mar '07

18 Mar '07

Am 28.12.2006 um 14:26 schrieb Thomas Grill: > Hi Luigi, > sending you a py/pyext binary for PPC/Intel here directly. I can't > upload to my webspace due to server problems. > Hope it works for you. > all the best, > Thomas > > <py.pd_darwin> > Hi Thomas its a while ago that you sent me that file, i didnt actually check back then I put together a PD-extended-Installer, with havung cheked especially on a Macbook on load i get this error. SInce i know nothing about how pyext works ;-) Is that a serious error ? I am downloading python right now and will check later on when its installed..... using Python 2.3.5 (#1, Jan 13 2006, 20:13:11) [GCC 4.0.1 (Apple Computer, Inc. build 5250)] ImportError: No module named numpy.core.multiarray Thanks Luigi

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Re: [PD] Binary - integer conversion
by Kyle Klipowicz 18 Mar '07

18 Mar '07

Here is that c code. Maybe it's useful, maybe not. ~Kyle On 3/16/07, David Powers <cyborgk(a)gmail.com> wrote: > No way, I'm stealing it and filing for a software patent... ;-) That > way nobody else will ever be able to convert to and from binary... > *insert evil laugh* > > ~David > > On 3/16/07, Kyle Klipowicz <kyleklip(a)gmail.com> wrote: > > I'll try to dig up my c code and give it to you, in exchange for GPL. > > > > ~Kyle > > > > On 3/17/07, padawan12 <padawan12(a)obiwannabe.co.uk> wrote: > > > On Fri, 16 Mar 2007 13:18:12 -0600 > > > "David Powers" <cyborgk(a)gmail.com> wrote: > > > > > > > Wow I thought for sure this would be built in ... or at least a common > > > > external. > > > > > > It possibly is. I'm just showing you how to do it from scratch in a way > > > that directly follows the algorithm Kyle pointed you at. > > > > > > You could use << and >> to rotate your numbers, and other ways to do it > > > differently. Making it extensible/flexible so that you can work on > > > 8, 16, 32 or bigger rythmns is an important consideration, and you > > > usualy end up using lists to do that or adopt a fixed width approach. > > > > > > > I guess speed is the issue here for me, rather than the ability to > > > > convert per se. > > > > > > The binary representation of beats has come up before, several times and > > > although it is seductive as an apparently efficient data structure it > > > has a bunch of its own pitfalls and weaknesses that I'm sure you will have > > > fun discovering :) As for speed, I don't think the conversion stage is > > > where you will gain much opimisation anyway if your premise is to save > > > cycles by doing bitwise transformations on integers. > > > > > > > This would be a good reason to write my first external > > > > I guess. > > > > > > Yes it would be a good task to do. It's quite trivial > > > in C. You could make a simple and general [bit n] > > > that returns the nth bit of a decimal int on its > > > left inlet. To do it properly and make it maintainable > > > perhaps some arguments for byte/word size and endiness > > > would help. > > > > > > > > > > > ~David > > > > > > > > On 3/16/07, Kyle Klipowicz <kyleklip(a)gmail.com> wrote: > > > > > You must implement the algorithm shown in this link: > > > > > > > > > > http://en.wikipedia.org/wiki/Binary_numeral_system#Decimal > > > > > > > > > > I did that in C during that earlier mentioned summer of my K&R C > > > > > binge. I'm not sure how tricky it would be to do in Pd. > > > > > > > > > > ~Kyle > > > > > > > > > > On 3/16/07, David Powers <cyborgk(a)gmail.com> wrote: > > > > > > Hi, sorry I do know that, but it's not my question. > > > > > > > > > > > > In order to use the bitwise operators, I think I need to convert an > > > > > > arbitrary string of 0's and 1's, say "00010101", into an integer, in > > > > > > this case I think 21. Is that more clear? > > > > > > > > > > > > Thanks, > > > > > > David > > > > > > > > > > > > On 3/16/07, Steffen <stffn(a)dibidut.dk> wrote: > > > > > > > > > > > > > > On 16/03/2007, at 18.44, David Powers wrote: > > > > > > > > > > > > > > > Hello, > > > > > > > > > > > > > > > > Is it possible to somehow convert back and forth between integer and > > > > > > > > binary in PD? > > > > > > > > > > > > > > > > My idea, is to represent simple drum machine style rhythms as binary > > > > > > > > numbers. [101010001011]. Ok, so if this were a float, it would be > > > > > > > > trivial to do a common task and shift the rhythm left or right. I > > > > > > > > think, that other rhythmic variations would also be quite fast to > > > > > > > > implement using this system, you can do binary math instead of list > > > > > > > > operations which should be much faster, I assume. > > > > > > > > > > > > > > > > > > > > > I think you want to have a look at the bitwice operators &,&&,|,||,<< > > > > > > > and >>. See also http://en.wikipedia.org/wiki/Bitwise_operation > > > > > > > > > > > > > > Hope this helps. > > > > > > > > > > > > > > > > > > > _______________________________________________ > > > > > > PD-list(a)iem.at mailing list > > > > > > UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list > > > > > > > > > > > > > > > > > > > > > -- > > > > > > > > > > http://theradioproject.com > > > > > http://perhapsidid.blogspot.com > > > > > > > > > > (((())))(()()((((((((()())))()(((((((())()()())()))) > > > > > (())))))(()))))))))))))(((((((((((()()))))))))((()))) > > > > > ))(((((((((((())))())))))))))))))))__________ > > > > > _____())))))(((((((((((((()))))))))))_______ > > > > > ((((((())))))))))))((((((((000)))oOOOOOO > > > > > > > > > > > > > _______________________________________________ > > > > PD-list(a)iem.at mailing list > > > > UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list > > > > > > _______________________________________________ > > > PD-list(a)iem.at mailing list > > > UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list > > > > > > > > > -- > > > > http://theradioproject.com > > http://perhapsidid.blogspot.com > > > > (((())))(()()((((((((()())))()(((((((())()()())()))) > > (())))))(()))))))))))))(((((((((((()()))))))))((()))) > > ))(((((((((((())))())))))))))))))))__________ > > _____())))))(((((((((((((()))))))))))_______ > > ((((((())))))))))))((((((((000)))oOOOOOO > > > -- http://theradioproject.com http://perhapsidid.blogspot.com (((())))(()()((((((((()())))()(((((((())()()())()))) (())))))(()))))))))))))(((((((((((()()))))))))((()))) ))(((((((((((())))())))))))))))))))__________ _____())))))(((((((((((((()))))))))))_______ ((((((())))))))))))((((((((000)))oOOOOOO

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Re: [PD] Fwd: Fwd: whitedeal
by europa989＠aol.com 17 Mar '07

17 Mar '07

alright restarted then same deal. this is peculiar. the laptop's cam still works this is windows. the reset button was on the camera. restarted the camera several times. tried opening the camera in windows movie maker. said unknown error when i tried selecting 'capture video' in the file menu. then the list of devices opened, the camera wasnt there, only the laptop's built in camera. restarted, the unknown error was gone (probably triggered since pd was open or just closed), but still only the laptop's built in camera was available for use (other one didnt show up) last weekend i used the camera on my mac desktop (with success). since then, i hadnt updated pd. like 4 minutes ago, i transfered the camera to the mac once again. now, when turning render on, the screen is all green. console's readings: pix_videoDarwin: height 320 width 240 pix_videoDarwin: could not make new SG channnel pix_videoDarwin: could not set SG ChannelBounds pix_videoDarwin: could not set SG ChannelUsage pix_videoDarwin: set SG NormalQuality pix_videoDarwin: Using YUV GemwinMac: width - 400 height - 400 GemWindow Activate err = 0 GEM: Start rendering pix_texture: not using client storage pix_texture: not using client storage error: pix_videoDarwin: no method for 'device' ... you might be able to track this down from the Find menu. error: enumerate not supported on this OS error: pix_videoDarwin: no method for 'channel' error: pix_videoDarwin: no method for 'mode' pix_videoDarwin: colorspace is GL_RGBA 32993 error: enumerate not supported on this OS GEM: Stop rendering GEM: Start rendering pix_texture: not using client storage like in a few weeks im gunna probably change cameras, though not yet, and this seems odd

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whitething
by europa989＠aol.com 17 Mar '07

17 Mar '07

hi, with the subject being somewhere within the gem pix_video arena; After successfully using it hooked up to pix_texture, then [rectangle 4 3] i think (my memory doesnt remember everything), i switched rectangle to square then back. it worked fine. then, i think the next step was I set [rectangle 4 3]'s 2nd and 3rd inputs to 16 (numberbox) and 9 (numberbox) respectively. So then, in the gemwin, with rendering still on, the rectangle was just plain white. The camera i dont believe ever powered off during this whole duration. I changed one menu option in the camera to display 4:3 window borders but also tested turning this menu option off with the white rectangle still there in effect. If i figure out a resolution on my own, I'll make the attempt to post it. ________________________________________________________________________ AOL now offers free email to everyone. Find out more about what's free from AOL at AOL.com.

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tabread4~ interpolation formula (was: a little pitchshifter)
by Charles Henry 17 Mar '07

17 Mar '07

Hi, list, I've finished analyzing the tabread4~ interpolation formula. It's a real work of art, because it has a great low-pass characteristic, has an efficient factorization, and has no phase shift. I want to apply the tabread4~ scheme whenever the playback speed is less than or equal to 1, and for higher speeds, use an time-dilated verson of the original polynomial as the low-pass characteristic to prevent aliasing. The interpolation polynomial from tabread4~ , g(t) is a piecewise continuous polynomial function, non-zero between -2 and 2. You can view the tabread4~ impulse response with an attached patch, view_tabread4~_impulse_response.pd and see for yourself what it looks like g(t)= { 1/6*(x+1)(x+2)(x+3) on [-2,-1) -1/2*(x+2)(x+1)(x-1) on [-1,0) 1/2*(x-2)(x+1)(x-1) on [0,1) and -1/6*(x-1)(x-2)(x-3) on [1,2] This function has several ways to be written g(t)= { 1/6*t^3 + t^2 + 11/6*t + 1 -1/2*t^3 - t^2 +1/2*t + 1 1/2*t^3 - t^2 -1/2*t + 1 -1/6*t^3 + t^2 - 11/6*t + 1 using the absolute value function |-1| = 1 and the indicator function I[a,b](t)={ 1 if a<t<b, 0 otherwise example, I[-2,-2](t)= 1 if -2<t<2, 0 if t<-2 or t>2 g(t)=I[-2,2](t)(-1/6*|t|^3 - 2*t^2 - 11/6*|t| + 1) + I[-1,1](t)(2/3*|t|^3 - 2*t^2 + 4/3*|t|) This last factorization is especially compact, and allowed easier computation of the fourier transform: G(w)=integral( from t= -2 to 2, g(t)*e^(-iwt) ) G(w)=(1/w^2)*[1/3*cos(2w) - 4/3*cos(w) + 1] + (1/w^4)*[2*cos(2w) - 8*cos(w) + 6] where w is in radians per second I checked that in the limit as w->0, G(w)->1, which is good And the filter, G(w) has pretty good rejection characteristics, I'd say. G(pi)= exactly 0.5, which is -3 dB. The stopband attenuation is at most, 1/w^2 which would mean -6 dB per octave, I think. An external can be made that will preserve these frequency characteristics roughly during playback at higher speeds. This would need to be implemented using convolution. The tabread4~ formula is an efficient way to calculate c(t) c(t) the continuous, interpolated function, as a function of input signal s(t) (sampled at some frequency) and (1/k)*g(t/k) the table-lookup interpolation formula, for a playback at speed k>1 s(t) is a sum of kronecker delta functions, multiplied by the sampled function values and (1/k)*g(t/k) is the function where g(t) is made longer by factor of k and is reduced in amplitude by factor k c(t)=s(t) convolved with (1/k)*g(t/k) Then, we can evaluate c(t) at each of the points at the input of tabread I would recommend that it be coded using circular convolution, making a finite sum at each point. Since we only need to evaluate c(t) at the points specified as input g(t/k) is zero if outside of -2*k < t < 2*k, so we would have to evaluate g(t) at no more than (4*k + 1) points, per sample on the whole block I think, it's possible to make an anti-aliasing table read. Would it take better stopband attenuation than -6db/octave to be a good anti-aliasing filter? Chuck

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Patch Crashed Durring Development and Will Not Reopen
by mark edward grimm 17 Mar '07

17 Mar '07

Dear collective PD community, While developing a patch PD unexpectedly crashed on me (windows extended version test 7)... Now when i try to open the patch PD just crashes immediately. This has never happened to me before so im not exactly sure what to do! I tried opening it on mac OSX with the same results - PD immediately crashes. I have not tried opening it on a linux environment yet. I opened the patch in jEdit to check to see if some information was corrupted upon crash and nothing seemed to catch my eye... In the process i have been trying to understand the code a little better so that I might be able to fix the patch directly in a text editor but when attempting trial-and-error by removing sections between "#n canvas"(s) i do not feel like i am altering the results in anyway... Ive attached the patch if someone would be kind enough to take a look for me! Ive worked on it quit a bit but be wary it is only about 1/4th done and i am usually very nervous about sharing my work before completion! thanks for the help! mark ____________________ mark edward grimm | m.f.a | ed.m megrimm.net | socialmediagroup.org & .com meg156(a)columbia.edu | 585.509.8703 ______________________________

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Having trouble using rradical abstractions
by Thomas Jeppesen 17 Mar '07

17 Mar '07

For example when I load the "rrad.nseq.pd" I get this error message: * OSC-route: float arguments are not OK. OSCroute $1 ... couldn't create pool 0.2.2pre - hierarchical storage object, (C)2002-2006 Thomas Grill [symbol2list] part of zexy-2.1 (compiled: Feb 27 2007) Copyright (l) 1999-2006 IOhannes m zmölnig, forum::für::umläute & IEM * OSC-route: float arguments are not OK. OSCroute $1 ... couldn't create I'd really like to use all these abstractions, as they fit my current project very well, but I can't seem to iron out this problem though. I'm using a windows installation. But I'm starting to feel that a lot of my troubles using pd will go away if I get a Linux-installation up and running instead. Cheers! Thomas

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GEM - "too many open files"-error with [pix_multiimage]
by orjo 17 Mar '07

17 Mar '07

i am currently working on a gem-project that uses a lot of images. the images are loaded and switched with [pix_multiimage] - and i want to change the set of images a few times, so i load quite a lot of images into memory.. and quite soon - after having loaded a few sets - all together about 2 or 3 thousand pictures, the "too many open files" message occurs. is there some fix or workaround for gem on win32 yet ? my project is nearly done - so this is the only (and a quite serious) problem i got. would need something like a really fast fix or workaround ;) the bug should be already known, cause i found this old mailing list posting by someone that apparently had problems with the same bug: "[GEM-dev] fixed filehandle leak? *Mathieu Bouchard* matju at artengine.ca <mailto:gem-dev%40iem.at?Subject=%5BGEM-dev%5D%20fixed%20filehandle%20leak%3F&In-Reply-To=> /Mon Jun 13 23:04:02 CEST 2005/ Here's a bug that causes a filehandle leak in GEM. Every time an image load is attempted via image2mem() (used by [pix_image], [pix_multiimage], etc.) then a series of decoders are called one after the other, quitting after the first that succeeds. If the file exists and is not of any type handled before the SGI handler and not of SGI type either, the SGI decoder does not close the file handle. This happened several times when loading a *lot* of TIFF images on Windows during a Pd/GEM workshop at Videographe, this afternoon. When too many files are "open", then PureData can't open any new patch and can't even save any modified patches!" any help appreciated. thanks, lorenz

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external viewers for additional file types ?
by Pete Redest 17 Mar '07

17 Mar '07

Browsing with the browser through the docs and examples, I run into a PDF file that that I generated from the tex source in tutorials/externals-howto (I copied this under /usr/local/lib/pd/doc from a download). Naively I thought I will click on the PDF and it will open in a PDF viewer. That didn't happen. Rather PD got stuck and I could only forcibly cancel it. Is there a way to define external viewers for files, e.g. a list of the kind: pdf /usr/bin/acroread text /usr/bin/gvim mov /usr/bin/xine txt internal [mM]akefile internal TODO internal .... Get the drift?. If there isn't such capability, can someone point for me at the PD source that makes the decisions with what program to open files (i.e. where it says if (!strcmp(suffix, ".pd") { open_with_pd(file) } or whatever is that it says) and if that is ok with the maintainers, I will incorporate this functionality and submit a patch for consideration. I am far too new to PD to try to find this myself. Thanks, -P _________________________________________________________________ Rates near 39yr lows! $430K Loan for $1,399/mo - Paying Too Much? Calculate new payment http://www.lowermybills.com/lre/index.jsp?sourceid=lmb-9632-18226&moid=7581

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