Pd-dev October 2020

pd-dev@lists.iem.at

14 participants
15 discussions

Doppler effect implementation
by Frodo Jedi 01 May '22

01 May '22

Hi all, I am searching for a Pd implementation of a doppler effect as realistic as possible. Any recommendations? Any patch/external already made and well tested? Cheers FJ

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My [hid] 0.7.1 fork builds without XCode
by Albert Rafetseder 24 Nov '20

24 Nov '20

Hello, TL;DR: Here's my fork of [hid] version 0.7.1 that needs no XCode to build on Mac OS X (10.11.6 on my end, hopefully on later macOSses too): https://gitlab.com/aaaaalbert/pd-hid It's based on https://git.puredata.info/cgit/svn2git/libraries/hid.git/ Long version: I'm just re-learning Pd and decided it would be a good idea to build it on my ageing Mac (which went marvelously!), and also build [hid] which didn't go that smoothly for me. In the versions of [hid] that I inspected [1], it requires XCode to build on Darwin, as the Makefile [2] passes to xcodebuild an XCode project file [3], lets XCode do its thing, then continues. I couldn't get my version of XCode to use the project file, running into this error: ``` xcodebuild: error: Unable to read project 'HID Utilities Slib.pbproj'. Reason: Project file 'HID Utilities Slib' was written by an unsupported Xcode version (38) ``` I soon gave up on hacking the project file and instead wrote a sub-Makefile for the Mac parts [4], adapted the main Makefile [5], and voilà! I can use a spare JoyCon game controller to feed button presses to my patches. I've built and manually tested my version of [hid], tentatively labeled 0.7.3, both on Mac (OS X 10.11.6) and Linux (Xubuntu 19.10) with PureData 0.50-2 as tagged on GitHub [6]. Outlook: I'm thinking of adding accelerometer support for the game controller, and perhaps sort out the values that hatswitches produce on different OSses. Thanks, Albert. [1] Here are the different versions / forks of [hid] that I found: * 0.7.1 --> https://git.puredata.info/cgit/svn2git/libraries/hid.git (That's the one I based my work on.) * 0.7 --> https://sourceforge.net/projects/pure-data/files/libraries/hid/hid-0.7.tar.… (as linked from the Pd wiki) * 0.7 --> https://salsa.debian.org/multimedia-team/pd/pd-hid/ * 0.7.1 --> https://github.com/agraef/purr-data/blob/master/externals/hid/ Binary releases from deken: * 0.7.1 --> http://puredata.info/Members/zmoelnig/software/hid/ * 0.7.1 --> http://puredata.info/Members/chr15m/software/v0-0extended/hid/ [2] original Makefile: https://git.puredata.info/cgit/svn2git/libraries/hid.git/tree/Makefile#n200 [3] XCode project file: https://git.puredata.info/cgit/svn2git/libraries/hid.git/tree/HID%20Utiliti… [4] sub-Makefile for Mac build, not using XCode: https://gitlab.com/aaaaalbert/pd-hid/-/blob/osx-build-without-xcode/HID%20U… [5] adapted main Makefile: https://gitlab.com/aaaaalbert/pd-hid/-/blob/osx-build-without-xcode/Makefile [6] https://github.com/pure-data/pure-data/releases/tag/0.50-2

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SVG Knob idea based on VCV Rack knob implementation
by Jakob Skouborg 30 Oct '20

30 Oct '20

Hey guys! Just some Friday thoughts about Pure Data and UI elements, like knobs, etc.: In VCV rack, it's pretty easy to make your own knobs for your modules. You can use the free open source program called Inkscape to make a knob, which is basically an SVG file. I was thinking that it would be really cool to be able to do something similar in Pure Data. To have an object/external that can load these knob SVG files into it, and then use the mouse to set a value(and knob position) between 0-1, either by dragging up/down or left/right and pressing the mouse on top of the object. It would really open up a whole new universe for Pure Data and making nice user interfaces. I have been playing with coding audio stuff for a few years in c++, mostly at hobby level, and I was wondering how hard it would be to make an object like that(if possible at all), that can load an SVG files created in Inkscape? Since VCV Rack is open source, I think I am going to see if I can find the code for the knob implementation this weekend, to see how it works in VCV. But first of all I am just curious about it and was looking for more experienced programmers though, especially you guys, who know a lot about PD, if it's a completely lost cause or if it is plausible idea. Personally I have not yet created any Pure Data externals, but I have been looking through some of dr. Hernandez pure data external creation tutorials on YT. I did make a bunch of VCV rack modules, so I know a bit about that. Any thoughts are welcome Besides that, have a great weekend! Best wishes, Jakob

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pd-lib-builder question (on osx)
by Iain Duncan 28 Oct '20

28 Oct '20

Hi devs, I'm trying to get pd-lib-builder working, but I think my lack of C building experience has me stuck. I was able to get my empty helloworld working ok, but not managing to link in S7. My project has one C file, and needs to also include s7.h and build s7.c I've included my (not working) Makefile below. When I try the below s7 does get compiled, producing an s7.o file, but instead of static linking I get an s7.pd_darwin file with all of the S7 stuff (it's big) and a tiny s4pd.pd_darwin file. And the external tries to load an s7 function and fails. Any tips much appreciated! thanks, Iain My Makefile: # library name lib.name = s4pd # tried these too, to no avail #lib.setup.sources = s7.c #common.source = s7.c # input source file (class name == source file basename) class.sources = s4pd.c s7.c # all extra files to be included in binary distribution of the library datafiles = README.md # include Makefile.pdlibbuilder from submodule directory 'pd-lib-builder' PDLIBBUILDER_DIR=pd-lib-builder/ include $(PDLIBBUILDER_DIR)/Makefile.pdlibbuilder

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qsort_r failure building puredata on Android?
by Andi McClure 28 Oct '20

28 Oct '20

I am building puredata via libpd on Android (a fork off 0.51/d5766fd0). I am doing this by loading the libpd CMakeLists.txt from my own CMakeLists invoked from gradle and then linking libpd in my Android app. When it gets to the step of building libpd.so, it prints: libpd/CMakeFiles/libpd.dir/pure-data/src/x_text.c.o: In function `text_define_sort': /path/to/repo/deps/libpd/pure-data/src/x_text.c:552: undefined reference to `qsort_r' I asked around about this, and was told a few things: * Sometimes this kind of Android error magically goes away if you fiddle with compileSdkVersion in gradle. * There is a list in this git repo: https://android.googlesource.com/platform/bionic/+/master/libc/libc.map.txt Of which libc symbols wind up in which binary in Android. However, in current Android master, qsort_r is not in this list at all. Only qsort. * qsort_r is not a standard C function, it is a GNU thing, so it's possible Android really just doesn't have it. If Android really doesn't provide quicksort, it *might* be possible to fake qsort_r by adding a single C++ file which wraps std::sort (this was added in C++03 so Android *probably* has it), which doesn't have standard C qsort's reentrancy problem. I found I was able to make it compile with the following patch: *diff --git a/src/x_text.c b/src/x_text.c* *index 44bf9521..18f3d9de 100644* *--- a/src/x_text.c* *+++ b/src/x_text.c* @@ -474,9 +474,9 @@ equal: found in msvcrt (which indeed it isn't in). Rather than waste more time on this, just call qsort if we're Microsoft and single-instance. I hope nobody will try to compile multi-instance Pd for 32-bit windows, but if they do, they might run into my qsort_s problem again. */ -#if defined(_WIN32) && !defined(PDINSTANCE) +#if (defined(_WIN32) || defined(__ANDROID__)) && !defined(PDINSTANCE) #define MICROSOFT_STUPID_SORT static void *stupid_zkeyinfo; static int stupid_sortcompare(const void *z1, const void *z2) { return (text_sortcompare(z1, z2, stupid_zkeyinfo)); } So although I'm not exactly sure what x_text.c is doing here, I am unblocked, I can proceed with my project as long as I don't need multi-instance. But, I'd like to know, is this a known problem? I find many references to people building PureData on Android but no one seems to have hit this issue. If there is a known working configuration for PureData on Android, what git revision of PureData was it building and what NDK compileSdkVersion? Alternately, is it possible the problem is not with my configuration, but with the libpd CMakeLists, and this problem would go away if I added the right #define or -l link argument? And if this is a new problem: Would a patch to address this be welcome, and what approach would be preferred? Should I just submit a patch triggering MICROSOFT_STUPID_SORT when __ANDROID__ is present? (I understand libpd is a different project from puredata and apologize if this is the wrong place to ask given I'm building libpd. However this seems (?) like a problem in the pure-data part of the code.)

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Re: [PD-dev] qsort_r failure building puredata on Android?
by Antoine Rousseau 27 Oct '20

27 Oct '20

This doesn't explain though why it works in certain situations. Using ofxPd or PdDroidParty for example, I don't remember I've ever had that issue. But (at least for ofxPd) it was compiled with c++ compiler; I don't know if this can matter.

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implementing pools of clocks?
by Iain Duncan 25 Oct '20

25 Oct '20

Hi folks, I'm working on an external for Max and PD embedding the S7 scheme interpreter. It's mostly intended to do things at event level, (algo comp, etc) so I have been somewhat lazy around real time issues so far. But I'd like to make sure it's as robust as it can be, and can be used for as much as possible. Right now, I'm pretty sure I'm being a bad real-time-coder. When the user wants to delay a function call, ie (delay 100 foo-fun), I'm doing the following: - callable foo-fun gets registered in a scheme hashtable with a gensym unique handle - C function gets called with the handle - C code makes a clock, storing it in a hashtable (in C) by the handle, and passing it a struct (I call it the "clock callback info struct") with the references it needs for it's callback - when the clock callback fires, it gets passed a void pointer to the clock-callback-info-struct, uses it to get the cb handle and the ref to the external (because the callback only gets one arg), calls back into Scheme with said handle - Scheme gets the callback out of it's registry and executes the stashed function This is working well, but.... I am both allocating and deallocating memory in those functions: for the clock, and for the info struct I use to pass around the reference to the external and the handle. Given that I want to be treating this code as high priority, and having it execute as timing-accurate as possible, I assume I should not be allocating and freeing in those functions, because I could get blocked on the memory calls, correct? I think I should probably have a pre-allocated pool of clocks and their associated info structs so that when a delay call comes in, we get one from the pool, and only do memory management if the pool is empty. (and allow the user to set some reasonable config value of the clock pool). I'm thinking RAM is cheap, clocks are small, people aren't likely to have more than 1000 delay functions running concurrently or something at once, and they can be allocated from the init routine. My questions: A) Am I right, both about being bad, and about clock pre-allocation and pooling being a decent solution? B) Does anyone have tips on how one should implement and use said clock pool? I suppose I should probably also be ensuring the Scheme hash-table doesn't do any unplanned allocation too, but I can bug folks on the S7 mailing list for that one... Thanks! iain

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How to learn about writing schedulers?
by Nicolas Danet 25 Oct '20

25 Oct '20

Hi, It is a bit off topic, but concerning multithread/atomic stuff i learned a lot in this blog < https://preshing.com/archives/ >. I often read it again when i want to refresh my knowledge each time go back in lock-free areas. HTH, nicolas.

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How to learn about writing schedulers?
by Iain Duncan 25 Oct '20

25 Oct '20

I hope this is ok on this list, please let me know if it should instead be on PD-OT. I'm looking for resources on learning how to write soft-real time scheduler engines for sequencing tools: patterns, data structures, tradeoffs of different approaches, etc. I'm interested in seeing how PD does it, but if anyone also knows of good books, sites, or otherwise that get into this topic deeply, I'd love to hear of them. It seems rather hard to find this kind of stuff, or maybe I just don't know where to look! thanks iain

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Re: [PD-dev] Compile Wish.app 8.6.10 fails on macOS Catalina (was: What is Wish version of Pd?)
by Dan Wilcox 24 Oct '20

24 Oct '20

Yup, ideally the Wish used by Pd could be compiled everywhere, but that's a limitation of the Tcl/Tk sources. This is why we distribute the pre-compiled Wish. > On Oct 24, 2020, at 12:00 PM, pd-dev-request(a)lists.iem.at wrote: > > Message: 1 > Date: Sat, 24 Oct 2020 10:35:27 +0200 (CEST) > From: Nicolas Danet <nicolas.danet(a)free.fr <mailto:nicolas.danet@free.fr>> > To: pd-dev <pd-dev(a)lists.iem.at <mailto:pd-dev@lists.iem.at>> > Subject: [PD-dev] Compile Wish.app 8.6.10 fails on macOS Catalina > (was: What is Wish version of Pd?) > Message-ID: > <1757910632.5168554.1603528527280.JavaMail.root(a)zimbra9-e2.priv.proxad.net <mailto:1757910632.5168554.1603528527280.JavaMail.root@zimbra9-e2.priv.proxad.net>> > > Content-Type: text/plain; charset=utf-8 > > > Hi. > > ./tcltk-wish.sh 8.6.10 > > The command above fails on macOS 10.15.7 ending with that: > > Undefined symbols for architecture x86_64: > "_TclIsSpaceProc", referenced from: > _strtoul in libtclstub8.6.a(strtoul.o) > ld: symbol(s) not found for architecture x86_64 > clang: error: linker command failed with exit code 1 (use -v to see invocation) > make[4]: *** [tktest-real] Error 1 > make[3]: *** [tktest] Error 2 > make[2]: *** [build-tk] Error 2 > make[1]: *** [tk] Error 2 > make: *** [embedded-deploy] Error 2 > > I got the same issue with the code from GitHub (release tag) < https://github.com/tcltk/tk/releases/tag/release <https://github.com/tcltk/tk/releases/tag/release> >. > I guess that this tag equals the downloaded sources from SoureForge. > The core-8.6.branch < https://github.com/tcltk/tk/tree/core-8-6-branch <https://github.com/tcltk/tk/tree/core-8-6-branch> > compiles fine, but (as i said it in previous thread) seems buggy for now. > > Anyway it doesn't matter. I can open an issue on GitHub if you want. > > But TBH it is more a problem for my fork, than for Pd itself! -------- Dan Wilcox @danomatika <http://twitter.com/danomatika> danomatika.com <http://danomatika.com/> robotcowboy.com <http://robotcowboy.com/>

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Pd-dev October 2020