Pd-list May 2007

pd-list@lists.iem.at

160 participants
312 discussions

Re: [PD] opencv motion tracker external HELP!
by nosehair911＠bellsouth.net 29 May '07

29 May '07

Martin, Thanks for your insight. I will look into that. It seems like sprintf/atoi is what I need to be looking at. Alain > > From: <martin.peach(a)sympatico.ca> > Date: 2007/05/29 Tue AM 11:51:36 EDT > To: <pd-list(a)iem.at> > CC: Tim Boykett <tim(a)timesup.org>, IOhannes m zmoelnig <zmoelnig(a)iem.at>, <nosehair911(a)bellsouth.net> > Subject: Re: Re: [PD] opencv motion tracker external HELP! > > > I dont think I quite understood. I tried: > > > > #define FRAMEOUT frame > > > > IplImage *frame = 0; > > > > x->x_outlet = outlet_new(&x->x_obj, &s_anything); > > outlet_anything(x->x_outlet, FRAMEOUT); > > > > with the same results. Maybe someone can dumb it down for me? > > You can only work with atoms in pd's message system, and each atom usually contains a bang, a float or a symbol. You could convert the pointer to a float but it probably won't work because the pointer is a large integer that won't be accurately represented as a float. You could convert the pointer to a symbol using something like: > char symstr[10]; > t_symbol sym; > sprintf(symstr, "%p", frame); > sym = gensym(symstr); > ...then send sym through the outlet and convert it back to a pointer at the receiving end by extracting the string from the s_name field of the symbol and passing it to atol(). > > Martin >

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Re: [PD] opencv motion tracker external HELP!
by martin.peach＠sympatico.ca 29 May '07

29 May '07

> I dont think I quite understood. I tried: > > #define FRAMEOUT frame > > IplImage *frame = 0; > > x->x_outlet = outlet_new(&x->x_obj, &s_anything); > outlet_anything(x->x_outlet, FRAMEOUT); > > with the same results. Maybe someone can dumb it down for me? You can only work with atoms in pd's message system, and each atom usually contains a bang, a float or a symbol. You could convert the pointer to a float but it probably won't work because the pointer is a large integer that won't be accurately represented as a float. You could convert the pointer to a symbol using something like: char symstr[10]; t_symbol sym; sprintf(symstr, "%p", frame); sym = gensym(symstr); ...then send sym through the outlet and convert it back to a pointer at the receiving end by extracting the string from the s_name field of the symbol and passing it to atol(). Martin

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ld flags
by xname 29 May '07

29 May '07

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Yo! Anyone can tell what should be the equivalent of this line on osx: ld -export_dynamic -shared -o pippo.pd_linux pippo.o -lc -lm ? i get ld: unknown flag: -export_dynamic and ld: unknown flag: -shared i had a look at the man id page and google but i am still confused. if there is someone who can tell me, or who managed to make the externals howto on osx, i'll be happy to share informations :) Cheers, Xname -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (GNU/Linux) iD8DBQFGXEu1NvasaG3ULUwRAmaDAJ9DyirP5Ah7KHLWLbv6qO5s0QaTfQCgmE1P qP3DOkUjlDp114fE41D1pVI= =dhR2 -----END PGP SIGNATURE-----

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opencv motion tracker external HELP!
by nosehair911＠bellsouth.net 29 May '07

29 May '07

For the last 2 weeks I have been trying to write a motion tracking external using the blob motion tracker in opencv. I had success with writing a program that recieves a path to an avi and motion tracks the blobs and prints their position. Now I am writing the set of Pd externals using the same code with very little success. I need someone that knows what they are doing to look at my Pd code and show me what I am doing wrong. I have read and followed IOhannes guide on external writing. Also, I have looked at the zexy and pdp sorce code in order to learn but still I am not getting it to work. The externals are based on the already working code I was able to frankenstein together. I am calling it FTIR_Tools. It consist of the following (if I ever get them to work!): 1. FTIR_Cam: detects webcam and sends out frames to outlet. 2. FTIR_VPlayer: reads quicktimes from path and sends out frames to outlet. 3. FTIR_Tracker: tracks blobs, sends out "matrix blob# position" to outlet2 and frames to outlet 1. you can also turn on and off visuals for center point and bounding box. 4. FTIR_Window: displays frames in an X11 window. Please look at my code and show me how to fix it. I am getting nowhere. In the cvBloblib.zip is the program I put together called Tracker and the code called Tracker.cpp. If you want to see how it works drag it to terminal and follow it with a path to an .avi. You must have opencv and fink installed. If you have ploblems installing opencv post and I will be glad to help. Thanks, Alain

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Re: [PD] opencv motion tracker external HELP!
by nosehair911＠bellsouth.net 29 May '07

29 May '07

I dont think I quite understood. I tried: #define FRAMEOUT frame IplImage *frame = 0; x->x_outlet = outlet_new(&x->x_obj, &s_anything); outlet_anything(x->x_outlet, FRAMEOUT); with the same results. Maybe someone can dumb it down for me? Alain > > From: IOhannes m zmoelnig <zmoelnig(a)iem.at> > Date: 2007/05/29 Tue AM 10:40:29 EDT > To: nosehair911(a)bellsouth.net > CC: Tim Boykett <tim(a)timesup.org>, pd-list(a)iem.at > Subject: Re: [PD] opencv motion tracker external HELP! > > nosehair911(a)bellsouth.net wrote: > > Thanks for helping. Well I basically have a rough sketch of all the objects but I am having a tough > > time with the outlet system. In a nutshell opencv uses an image structure called "typedef struct > > _IplImage." Acording to them "The structure IplImage came from Intel Image Processing Library > > where the format is native." I can give you more information about it if you need it. My problem is > > sending the result from IplImage to an outlet and being able to receive it from an inlet. So far that is > > my bigest hurdle. I have this code: > > > > IplImage *frame = 0; > > > > x->x_outlet = outlet_new(&x->x_obj, &s_anything); > > outlet_anything(x->x_outlet, frame); > > > > Obviously with more stuff in the middle but I keep getting this error from the compiler: > > > whoa don't do that. > > if you are sure that you have to send pointers around, then you should > a) have a look at Gem (where this is done) or GridFlow and > b) don't do it (Gem is using this for legacy reasons); really. even > though pd has "pointers", they are not meant for passing arbitrary data > around. > > if you want to do it the clean way, you will have to create ids (numeric > or symbolic), associate your data-chunks with ids, pass the ids through > pd's messaging system and look them up at the receiving side. > pdp does it like this. > > an alternative might be mrpeach's "string/blob" patch, but then you > would rely on a patched pd, which is not a very good idea. > > if you are not sure, then i suggest to not do it that way (unless you > want to spend some time in getting into coding) > > > otoh, why don't you just use the Gem framework? > i guess that you could fit the IplImage into an imageStruct with not > much overhead (but then i don't know this structure; if it is > fundamentally different from Gem's imageStruct you might lose everything > you gained speedwise) > > > > if nothing else works, it might be simplest to just write your own > application (without pd) and send the data to pd via your favourite > protocol (FUDI, OSC, SMTP...) >

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Re: [PD] opencv motion tracker external HELP!
by nosehair911＠bellsouth.net 29 May '07

29 May '07

Thanks for helping. Well I basically have a rough sketch of all the objects but I am having a tough time with the outlet system. In a nutshell opencv uses an image structure called "typedef struct _IplImage." Acording to them "The structure IplImage came from Intel Image Processing Library where the format is native." I can give you more information about it if you need it. My problem is sending the result from IplImage to an outlet and being able to receive it from an inlet. So far that is my bigest hurdle. I have this code: IplImage *frame = 0; x->x_outlet = outlet_new(&x->x_obj, &s_anything); outlet_anything(x->x_outlet, frame); Obviously with more stuff in the middle but I keep getting this error from the compiler: error: cannot convert IplImage* to t_symbol for argument 2 to "void outlet_anything(_outlet*, t_symbol*, int, t_atom*) I still havent figured a way around this. I am sure its easy but... Anyway Im trying to figure out the outlet first before I tackle the inlet. Any advise? Alain > > From: Tim Boykett <tim(a)timesup.org> > Date: 2007/05/29 Tue AM 05:18:54 EDT > To: <nosehair911(a)bellsouth.net> <nosehair911(a)bellsouth.net> > Subject: Re: opencv motion tracker external HELP! > > > Hi Alain, > > how is this coming along? I gather that you got the tracker working > as a standalone, but no luck with the external yet. Is that right? > > I would be interested in perhaps helping, but I thought I would check to > see what was already working. > > cheers, > > tim > > > On 27/05/2007, at 10:35 PM, <nosehair911(a)bellsouth.net> > <nosehair911(a)bellsouth.net> wrote: > > > For the last 2 weeks I have been trying to write a motion tracking > > external using the blob motion > > tracker in opencv. I had success with writing a program that > > recieves a path to an avi and motion > > tracks the blobs and prints their position. Now I am writing the > > set of Pd externals using the same > > code with very little success. I need someone that knows what they > > are doing to look at my Pd code > > and show me what I am doing wrong. I have read and followed > > IOhannes guide on external writing. > > Also, I have looked at the zexy and pdp sorce code in order to > > learn but still I am not getting it to work. > > The externals are based on the already working code I was able to > > frankenstein together. I am > > calling it FTIR_Tools. It consist of the following (if I ever get > > them to work!): > > > > 1. FTIR_Cam: detects webcam and sends out frames to outlet. > > 2. FTIR_VPlayer: reads quicktimes from path and sends out frames to > > outlet. > > 3. FTIR_Tracker: tracks blobs, sends out "matrix blob# position" to > > outlet2 and frames to outlet 1. > > you can also turn on and off visuals for center point and bounding > > box. > > 4. FTIR_Window: displays frames in an X11 window. > > > > Please look at my code and show me how to fix it. I am getting > > nowhere. In the cvBloblib.zip is the > > program I put together called Tracker and the code called > > Tracker.cpp. If you want to see how it > > works drag it to terminal and follow it with a path to an .avi. You > > must have opencv and fink installed. > > If you have ploblems installing opencv post and I will be glad to > > help. > > Thanks, > > Alain > > <FTIR_Tools(src).zip> > > <cvBloblib.zip> > > _______________________________________________ > > PD-list(a)iem.at mailing list > > UNSUBSCRIBE and account-management -> http://lists.puredata.info/ > > listinfo/pd-list > >

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Behavoir of [keyup] in Linux
by ugur guney 29 May '07

29 May '07

# Hi! # I started to write an answer to a question on list about using keyboard input in a patch. Then I realized that a patch which I written in Windows does not work well under Linux, to which I have switched weeks ago. # When I press and hold a key, after a short time [keyup] starts to output the number of that key repeatedly (before releasing it). In Windows it only outputs the key no when a key is released. Do you have any idea why there is a difference between two platforms? # I'm using canonical Pd version 0.40-2 under Ubuntu Feisty. -ugur guney-

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[PD-announce] GOTO10 @ folly Summer School of Sound 27-28-29 June 2007
by propaganda＠goto10.org 29 May '07

29 May '07

sorry for >< please >> --- GOTO10 @ folly Summer School of Sound June 27, 28, 29 2007 / 10am - 4pm St Martins College, Lancaster This year's Summer School of Sound will be led by GOTO10. Marloes de Valk and Aymeric Mansoux will lead a three day course, exploring free and open source software available for home studio purposes such as audio and midi sequencers, sound editors and virtual effect racks, as well as the creative possibilities of puredata in an audio workstation setup. The course will also provide information on how to release and publish your work online (from encoding, to licensing and streaming). The Summer School of Sound will also include an evening performance on Thursday 28 June by GOTO10 artists de Valk and Mansoux, as well as Claude Heiland-Allen and Chun Lee. The three day summer school is aimed at musicians, designers, artists and those with an interest in multimedia technologies who want to explore how new digital technologies can help and inspire us when working with music and sound. Participants do not need a high level of technological or programming skills, although these would be beneficial. A strong interest in one or more of the following areas is essential: sound art, music, technology, open source software. --- Booking fees and deadline: Organisational rate: £250 Individual rate: £150 To apply for a place please email Jennifer Stoddart, Programme Co-ordinator at jennifer.stoddart 'at' folly.co.uk with brief details of your background, interest and experience in the areas listed above, and an indication of your level of computer literacy. The closing date for applications is Thursday 31 May 2007. Applicants will be informed after this date if their application has been successful. Please note: to apply for a place, you must be able to attend all 3 days of the Summer School. --- more information and detailled course content http://folly.co.uk/?q=summerschool :* _______________________________________________ PD-announce mailing list PD-announce(a)iem.at http://lists.puredata.info/listinfo/pd-announce

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Re: [PD] sample playing
by Zeitler Andreas 29 May '07

29 May '07

> Attached is a slightly different sampler, actually not a sampler > itself, but a tutorial on how to build your own sampler. > >> What i want to do: >> I want to make a patch, a sample player. When i press a button i want >> to loop the actual sample position according to the key i have >> pressed. >> >> I give you an example. I load a loop which is 120 BPM fast. I set >> somewhere my tempo. When i press "a" it starts looping 1/4th at the >> actual play position. >> >> For this sort of thing. The Sample Player seems to be perfect. But >> now there are the difficulties. >> >> - How can i set the tempo right? I figured out how to calculate the >> tempo for any note length. > > If you work through attached tutorial, maybe some of the neccessary > calculations (as: duration(smps) => duration(msec) etc.) become > clearer. Thanks Frank, That did help very much! I have not used the tutorial so far to build my own sampler. But i found some way to figure out how the mentioned loop sampler works. It does the job very well by now, in some point of view. When i press a key (maybe "a") it sets the loop in point the actual play position and according to that the out point to lets say, 1/16th note behind that. But it takes 1 time until the playhead reaches again the in point until the sample really starts looping. Maybe i should start building from scratch. You were a great help! Thansk again Andreas Zeitler

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wiiremote for Mac OS X/PowerPC
by Hans-Christoph Steiner 29 May '07

29 May '07

I just merged in aka's most recent changes and got it building. I have neither bluetooth nor a wiiremote, so it up to y'all to figure out if it actually works: http://idmi.poly.edu/pdlab/wiiremote.pd_darwin-PowerPC.zip I'll try to put out a Mac/Intel version tomorrow if there is interest. .hc ------------------------------------------------------------------------ ---- Man has survived hitherto because he was too ignorant to know how to realize his wishes. Now that he can realize them, he must either change them, or perish. -William Carlos Williams

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Pd-list May 2007