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9620 discussions

Polling: Execute a function every X ms from within the external.
by Kyriakos Charalampides 29 Apr '21

29 Apr '21

I recently started learning how to write some custom pd externals. It has been quite fun until now, but its been a few days I am stuck in a loop. I want to read a buffer coming from an external device every 1 ms. I could do that with a metro but this can cause several issues with this buffer. My initial though was to use a for loop but this was obviously a horrible idea since pd will stuck in the for loop and hang. Then I though to use a clock to execute my reading function but all examples with clock and clock_delay seem to be based on for and while loops. What I would really like to achieve is to execute the reading function every 1ms and interrupt this process every time that a new message is coming from pd. Any tips or ideas will be highly appreciated. All best, Kyr

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signal graph processing
by David Rush 28 Apr '21

28 Apr '21

Hi All - I'm trying to figure out where to look in the code to try and understand the signal rate processing better. Specifically, I want to understand how the graph gets optimized - I've read a rumour that [*~ 0] can cause a whole signal chain to stop being computed, and I would like to verify that in the code and understand the whole process a bit better. Where should I start looking? TIA - d -- GPG Public key at http://cyber-rush.org/drr/gpg-public-key.txt

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multi-architecture deken packages
by IOhannes m zmölnig 15 Apr '21

15 Apr '21

this all started as a thread on github: https://github.com/ericlyon/pd-fftease/issues/45 since i think it is of general interest (and i'm pretty sure i will never ever find the relevant info under the "time for a new release? (FFTease-3.1)" thread again, i'm taking this discussion here. the thread mainly revolves around how to create a single deken-package that contains binaries for all the relevant architectures. i'm too lazy to recap it here. the current discussion state is, how to deal with all those arm-variants out there. if somebody has more insight into the arm architectures, please shed a light :-) :::::: it's not complicated: the 32bit arm variants `armv6`, `armv7`, `armv8` (aka `aarm32`),... are backwards compatible. - you can run a binary compiled for `armv6` on any `armv7` or `armv8` CPU. - you can run a binary compiled for `armv7` on any `armv8` CPU. - but you cannot run a binary compiled for `armv8` on the older `armv7` resp `armv6` CPUs (missing instruction set) - similarly, you cannot run a binary compiled for `armv7` on the older `armv6` CPU. it's very similar to `i386` and `i686` and `Pentium-i7` and the like. typically, the newer CPUs will have instruction sets that outperform the older CPUs (`MMX/SSE/AVX` on the `x86` platform; `NEON` on `arm`). however, if you have a modern `Pentium-i7` and you are running an `i386`-compatible binary you will probably still get decent performance, because the processor is so much faster. with `arm`-chipsets it is a bit different, as they are much less powerful, so you hit the limitations sooner. @porres wrote: > I'm confused now, does this mean Raspbian is just for RPi Zero/1? it means that you can use Raspbian on the RPi Zero/1/2/3 and 4. however, you will get sub-optimal performance on the RPi2 and above. if you enable the normal Debian repositories on the RPi, you will get into trouble on the RPi Zero/1, as the binaries might (and most likely: will) have instructions that the RPi Zero/1 lacks. > so i'm confused, is the organelle a rasp 1? it all depends on which version you have. the [current specs](https://www.critterandguitari.com/organelle#design-specs) mention a `ARM Cortex A53` which is an `aarch64` processor (`armv8`) @emviveros wrote > "compute module" are not important since **RPizero variants are important**, so armv6 should be disponible. i'm not sure i understand what you mean. i tried to say, that i believe that - "compute module" is not important - RPi/zero is of (limited) importance - because of the RPi/zero we probably want to support `armv6` i guess you are saying the same(?) and > My first annoying is how to name armv6, armv7 and armv8 (aarch64) binaries to create a unified deken package for arm compilations. i don't know what this means either. however, i think we should forget about a unified `arm32` deken package. > armv6 = ?? (maybe .pd_linux) > armv7 = .l_arm > armv8 = .l_arm64 to which @porres answered: > anyway, let's just have these 3 together and I guess there won't be any issues :) at least for me, `armv8` is not the same as `aarch64`. most `armv8` are capable of both 32bit (`aarch32`) and 64bit (`aarch64`) instruction sets, but the 64bit part is optional. i'd prefer to use the `armv8` name for the 32bit variant *only*. when talking about the 64bit variant, we should use `aarch64`. regarding `armv6` and `armv7` in a single folder, i'm not sure whether this would work: - if a `Pd-armv7` happens to see the `armv6` external first, it will just load it (and never try to `armv7` binary) - if a `Pd-armv6` happens to see the `armv7` external first, it will just try load it: and i think the *loading* would succeed, leading to crashes whenever an illegal (armv7-)instruction is encountered. but as i've written above: the `armv6` is a very limited platform. you probably do not want to install any binaries that you cannot use on it anyhow. so i'd suggest to cram all the architectures into a fat deken package with the exception of `armv6` which you should package separately. mgfds IOhannes

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example external code to browse?
by Iain Duncan 12 Apr '21

12 Apr '21

Hi everyone, I'm working now on a PureData port of Scheme For Max, but am hitting some obstacles and am wondering if anyone can point me at sample external code that can be browsed somewhere? (I'm very new to Pd). Specifically I'm looking for stuff that involves event oriented handling and dynamic methods, symbols, etc. (basically all the non-dsp stuff). I've seen the github how to but that's not covering much in the way of working with symbols extensively. thanks! iain

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Modified [partconv~] and issues with fftw3
by Gloria Dal Santo 07 Apr '21

07 Apr '21

Hi everyone! I’m trying to create a sort of 3d audio reproduction system by convolving the dry sound with the BRIRs of a room. The patch I’m working on will be connected to a head-tracker so that I can change BRIR depending on the position of the listener. To achieve this I tried to use bsaylor’s [partconv~] but unfortunately, when I set a new impulse response, I have a short dead time. To fix this I tried to cross fade the output of two [partconv~] but this messes up the binaural cues, it is not the right approach. My idea is that of modifying the .c code of the external to get what I need. Usually, I work on Code::Blocks, MinGW compiler, Win10. I’ve already built some super simple externals, but this time I’m facing a problem that I’ve never encountered before: to perform the Fourier transform, partconv~.c uses the fftw3 library, and I couldn’t find a way to add it to the Linker Options. >From what I’ve understood online, fftw3 is a dynamic library, therefore there’s no .lib file. On Code::Blocks Settings -> Compiler -> Linker Settings -> Link libraries I cannot load a .dll dynamic library. I tried different solutions that I found online but none of those worked. I get “undefined reference to” errors when calling all the fftw3 functions. Can any of you help me somehow? If you were able to write an external that referred to the fftw3 library, how was your setup? Moreover, I saw that in the bsaylor’s library folder there are also files of the type .dsp, .dsw, .o. Once I modify the .c code, should I update those as well? I hope that I stated my issue clearly, if now please ask me for further details. Thank you in advance for your time. Gloria

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symbol comparison vs strcmp()
by IOhannes m zmölnig 11 Mar '21

11 Mar '21

hi all, Pd uses a symbol-table for practically all of its string handling. the main purpose of the the symbol table is, as i understand it, to make string comparison super-fast (as there's no need to compare each character but just a simple address). now, looking at the code i see quite a number of places¹ where something like this is used: > strcmp(atom_getsymbolarg(i, argc, argv)->s_name, refstring); what is the reason for this? is it just out of habit (because in all the other projects you usually use strcmp()) or because this is an attempt to not pollute the symbol table needlessly? or am i missing something? or should they just be replaced with symbol comparisions? gmsadr IOhannes ¹ i've counted about 135 of such uses (automatically; so I certainly missed a few)

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"int argc" giving weird values
by Alexandre Torres Porres 03 Mar '21

03 Mar '21

Hi, been working on a delread/write variation as posted on the pd-list with more features, like freezing. I have a single "del~" object (named like this for now) and I can define if it's "in" (write) or "out" (read). This is like other pd objects like [list]. I do this so I can use pd_findbyclass so I can pair objects by delay line name ([del~ in xxx] and [del~ out xxx]). I read that was the way to do it in some other thread here not long ago. Now, maybe I've seen this weird behaviour before but I can't see what's happening. I have A_GIMME to parse arguments and when trying to print the number of arguments (usually defined as "argc") I don't get the values I expect, but very large and negative ones (what the hell?). I uploaded my prototype just so you can see this and help me figure out where the problem is => https://github.com/porres/pd-else/blob/master/Classes/Source/del~.c here's the global setup function for both objects https://github.com/porres/pd-else/blob/master/Classes/Source/del~.c#L290 here in the "del_new" function, if I query for the number of arguments, I get the weird values already, see https://github.com/porres/pd-else/blob/master/Classes/Source/del~.c#L266 why dear god, why? please please please, it's late and I'm losing sleep thanks

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netreceive: listen failed: Address already in use
by Pierre Guillot 28 Feb '21

28 Feb '21

Hello, A Camomile user encounters an issue with the [netreceive] object. The main patch contains [netreceive-u -b 15200] and the plugin is loaded several times (if the plugin is removed and added to the track several times in a row or the host application closes and reopened several times in a row), the object fails to connect with the error message "netreceive: listen failed: Address already in use (48)". Here is the Github issue: https://github.com/pierreguillot/Camomile/issues/241. This issue happens on macOS with the Camomile 1.0.8-beta running with the latest Pd 0.51-4. The problem is not systematic but is easily reproducible. This problem doesn't seem to happen in the Pd application if only one [netreceive] object listens to a specific port. If two [netreceive] objects listen to the same port, one of the objects cannot listen, and the same error message appears. Is it normal? I managed to solve this problem by replacing SO_REUSEADDR to SO_REUSEPORT on the function socket_set_boolopt() (l. 703 of x_net.c). I don't know much about sockets but I understand that it allows two [netreceive] objects to use the same address AND the same port. Do you think this is a proper way of fixing this problem? If so I can create a PR. If not, what would you suggest? P.S. It doesn't seem to be compatible with Windows but a simple #if WIN32 would fix it. Thank you, Pierre

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RPM spec for Pd
by Vitaly Dolgov 26 Feb '21

26 Feb '21

Hi, everybody! Recently I was working on an RPM spec for Fedora as it doesn't have an officially maintained package, so I began to write my own. The spec is fairly simple, but there is the only one problem I want to discuss with you. In src/Makefile.am on line 400 there is command for absolute symlink, which is an error for RPM package builder, so I fixed it with the following patch before starting build: @@ -400 +400 @@ - $(LN_S) $(DESTDIR)$(bindir)/pd $(DESTDIR)$(libpdbindir)/pd + $(LN_S) -r $(DESTDIR)$(bindir)/pd $(DESTDIR)$(libpdbindir)/pd I was trying to be as close as possible to INSTALL.txt, but I'm a newbie in Pd development as well as in RPM spec writing, so I can do everything completely wrong. I'm sorry if that's the case. Is it possible to fix the aforementioned issue upstream or is there a better way to approach this problem? I also noticed that there is an RPM spec in linux/ directory in repo, but is seems it was not updated for 14 years or so. Is there any chance you update it in a future? Thank you, Vitaly

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Re: [PD-dev] Problem with the error function
by Dan Wilcox 22 Feb '21

22 Feb '21

Do you think it would be useful to add this to the libpd README or a wiki page? > On Feb 22, 2021, at 12:00 PM, pd-dev-request(a)lists.iem.at wrote: > > Message: 1 > Date: Sun, 21 Feb 2021 17:51:39 +0100 > From: Pierre Guillot <guillotpierre6(a)gmail.com <mailto:guillotpierre6@gmail.com>> > To: pd-dev <pd-dev(a)iem.at <mailto:pd-dev@iem.at>> > Subject: Re: [PD-dev] Problem with the error function > Message-ID: > <CALPKkhofbAgTPjohGMyvNFt3bau4yh=a+snV9_G3pxp3o+RkKw(a)mail.gmail.com <mailto:CALPKkhofbAgTPjohGMyvNFt3bau4yh=a+snV9_G3pxp3o+RkKw@mail.gmail.com>> > Content-Type: text/plain; charset="utf-8" > > Finally, I think I found the solution. I simply have to use > "-Wl,-Bsymbolic" option for the linker (not only for Pd/libpd but also for > the VST/LV2 libraries). > > set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-Bsymbolic") > set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} -Wl,-Bsymbolic") > > Hope this helps someone else :) -------- Dan Wilcox @danomatika <http://twitter.com/danomatika> danomatika.com <http://danomatika.com/> robotcowboy.com <http://robotcowboy.com/>

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