Pd-dev January 2005

pd-dev@lists.iem.at

18 participants
43 discussions

How do add a symbol inlet to right left inlet?
by B. Bogart 06 Jan '05

06 Jan '05

hey all, I can clearly see how to add a symbol inlet to the left inlet of an external using class_addsymbol() but how to bind this to a symbol inlet created with: x->in2 = symbolinlet_new(&x->x_obj, &x->currentSymbol); I confess I'm not exactly sure why I need the &x->currentSymbol part and what this memory space is used for... I'm adding a right inlet to popup so that one can choose the item by symbol value and not just by index. (for symbolic memento state-saving) Any suggestions? Thanks. Ben

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returning abstraction directory
by B. Bogart 06 Jan '05

06 Jan '05

Hey Miller and all, I've been using Guenter's hack "pwd" to get the topdir of the patch. I'm now seeing if I can hack pwd to give me the directory of the abstraction containing the object. I see along side canvas_getdir() in m_pd.h canvas_getcurrentdir() but when I try and use it I get a memory access error: Consistency check failed: canvas_getenv Program received signal EXC_BAD_ACCESS, Could not access memory. canvas_getenv (x=0x0) at g_canvas.c:169 169 while (!x->gl_env) (gdb) where #0 canvas_getenv (x=0x0) at g_canvas.c:169 I don't know whats going on here, but does the canvasenvironment contain the directory of the abstraction? if so how can I access it? This is a great example where documentation of all of the m_pd.h functions and how to use (examples) would be amazing. I feel like I'm constantly pestering the list with things I should be able to look up somewhere. Perhaps something like the flext documentation which I think was generated by the source comments using doxygen? Many thanks to all those answers to all my questions. B.

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API documentation
by Ian Smith-Heisters 05 Jan '05

05 Jan '05

Is there a comprehensive documentation of the basic Pd API for writing externals? I've read the pd-external HOWTO, but there seems to be many functions that are undocumented apart from sparse comments in the source code. Thanks, Ian Smith-Heisters

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PDP: How to modify packets in pdp_v4l_bang?
by Frank Barknecht 04 Jan '05

04 Jan '05

Hi, I almost have ov519 cameras working in PDP now, but sucking really really badly at C (P-languages spoiled me) I don't understand several things yet and so I desperatly need some help/explanations. I'm soooo close to have the cam working, it's just a little bit of pushing in the right directions needed, I guess. I even have difficulties finding the right quesitons to ask. Well, for one: I don't really understand the role of the "newimage" pointer in pdp_v4l_bang(): It is set two times, once as: /* get the address of the "other" frame */ newimage = x->x_videobuf + x->x_vmbuf.offsets[x->x_last_frame]; then later is is set again without ever being used inbetween: newimage = x->x_videobuf + x->x_vmbuf.offsets[x->x_frame ^ 0x1]; However if I comment out the first assignement, PDP doesn't work right anymore, so I suppose, it is used somehow in between. Could someone explain to me, where, how, and why? Second Question: To decompress video data delivered in JPEG, am I right in guessing, that I have to change the content of newimage's data after it is set the second time in pdp_v4l_bang? (BTW: I currently get the same results visually, whereever I change newimage.) At least I found out, that newimage carries the compressed data. Sending "newimage" into the jpeg decompression as input to the "source manager" of jpeglib at least gives "something". However I think, I don't really get where to put and where to get the image data, probably because I don't really understand the double buffering correctly, ah, no. Well, the latest code gives a full picture, mostly even without JPEG decompression errors, however the images is jumping left and right and also is in "vertical splitscreen" mode, that is, it is split in half and two half-pictures are laid out next to each other. The frontier is moving. I would like to do a screenshot, but I cannot get "import" or any other tool to grab the framebuffer-screen. Ciao -- Frank Barknecht _ ______footils.org__

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is namecanvas obsolete or not?
by Tim Blechmann 03 Jan '05

03 Jan '05

hi miller, hi devs ... i wrote an abstraction using message-based patching ... therefor, i was sending the messages to pd-test.pd ... but since it's an abstraction all other instances of test will receive the same message, resulting in the multiple creation of the object ... to solve this, i had to use namecanvas $0-test... and send the messages there ... (example patch is attatched) am i missing something obvious or is namecanvas not as obsolete as the helpfile says... cheers ... tim -- mailto:TimBlechmann@gmx.de ICQ: 96771783 http://www.mokabar.tk After one look at this planet any visitor from outer space would say "I want to see the manager." William S. Burroughs

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Eyetoy - a tiny bit of success
by Frank Barknecht 03 Jan '05

03 Jan '05

Hi, (somehow pf-list seems to be unavailable to me currently, so I'm posting this to pd-dev, too. Sorry for duplicates. The attached patch is slightly updated compared to the first version, although not working better. And maybe someone feels inspired to do a similar thing for GEM??? Yes, please. ;) attached hacked-up version of ./modules/image_io/pdp_v4l.c now supports Webcams with standard JPEG compression as the Eyetoy cam and others with the OV519 chipset. The support is very shaky still, though: I get a lot of decompression errors, sometimes totally black frames and lots of errors like: Not a JPEG file: starts with 0xb8 0x94 Not a JPEG file: starts with 0xad 0x95 Not a JPEG file: starts with 0xa5 0x96 Corrupt JPEG data: premature end of data segment Unsupported marker type 0xa3 Not a JPEG file: starts with 0x8b 0x95 Not a JPEG file: starts with 0x95 0x90 Not a JPEG file: starts with 0x8d 0x95 Not a JPEG file: starts with 0x96 0x95 Not a JPEG file: starts with 0x98 0x94 Not a JPEG file: starts with 0x86 0x95 Not a JPEG file: starts with 0xbb 0x99 Corrupt JPEG data: premature end of data segment Unsupported marker type 0xf4 Not a JPEG file: starts with 0xb7 0x95 Nevertheless I can see a moving picture with the cam now, although it is more like cinema shortly after it was invented. I suppose that I am not correctly waiting for a whole frame to arrive. The wrongly decompressed jpeg images all have their decompr. artifacts in the upper part of the pdp-output window, while the lower part is just a solid black or grey. Unfortunatly (as the code shows) I still don't know my way around basic PDP yet, and I really would love for someone to maybe take a look at my hopefully obvious errors. The code itself is very dirty and messy and involves a lot of guesswork on my side. A lot of it is copied from jpeg.c in libpdp, the other source is showview.c from the only working camera applications for ov519 cams (I posted a link a while ago). My changes are between the /* fbar: jpeg start */ and /* fbar: jpeg end */ comments. The main action happens in "load_packet_jpeg", which is called from pdp_v4l_bang. I set: x->x_v4l_palette = VIDEO_PALETTE_RGB24; there which was the final guessed step to give a picture, hooray. I wonder, how jpeg_decompression or similar functionality can be included in pdp_v4l. It could become a second argument to pdp_v4l_open IMO, like: [open /dev/video1 jpeg=1( or similar. Or make a new method for this or, the holy grail, let pdp autodetect jpeg, but this is way above my head. Currently my code just ignores this all and just expects an ov519 cam. Well, that's it for now. Feedback and help would be highly appreciated. Ciao -- Frank Barknecht _ ______footils.org__

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[ pure-data-Patches-1094912 ] message-based access to the audio api
by SourceForge.net 03 Jan '05

03 Jan '05

Patches item #1094912, was opened at 2005-01-03 11:56 Message generated for change (Tracker Item Submitted) made by Item Submitter You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=478072&aid=1094912&group_… Category: puredata Group: None Status: Open Resolution: None Priority: 5 Submitted By: Tim Blechmann (timblech) Assigned to: Nobody/Anonymous (nobody) Summary: message-based access to the audio api Initial Comment: attached is a patch that simplifies message-based access to the audio api: pd understands the following messages: audio-samplerate audio-delay audio-dacblocksize audio-scheduler audio-device audio-device-in audio-device-out audio-dacblocksize and audio-scheduler require devel_0_38 ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=478072&aid=1094912&group_…

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[ pure-data-Patches-1094910 ] fix for cnv empty label bug
by SourceForge.net 03 Jan '05

03 Jan '05

Patches item #1094910, was opened at 2005-01-03 11:50 Message generated for change (Tracker Item Submitted) made by Item Submitter You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=478072&aid=1094910&group_… Category: puredata Group: bugfix Status: Open Resolution: None Priority: 5 Submitted By: Tim Blechmann (timblech) Assigned to: Nobody/Anonymous (nobody) Summary: fix for cnv empty label bug Initial Comment: after sending an empty label to the canvas with |;mycanvas label( the cnv object gets corrupted: fix is attached ... ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=478072&aid=1094910&group_…

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modified stack management
by Tim Blechmann 02 Jan '05

02 Jan '05

hi all ... i did some modifications to thomas grill's stack management using atomic operations to make them threadsafe. since i'm not able to test on a mac, would it be possible that someone would have a look at it and test it? thanks ... tim -- mailto:TimBlechmann@gmx.de ICQ: 96771783 http://www.mokabar.tk After one look at this planet any visitor from outer space would say "I want to see the manager." William S. Burroughs

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Re: [PD-dev] GEM and operator new
by Georg Holzmann 02 Jan '05

02 Jan '05

a sidenote: in the attached file the following include is unnecessary: #include <stdexcept> (in CPPExtern.h ) LG Georg -- +++ Sparen Sie mit GMX DSL +++ http://www.gmx.net/de/go/dsl AKTION für Wechsler: DSL-Tarife ab 3,99 EUR/Monat + Startguthaben

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Pd-dev January 2005