Pd-list October 2004

pd-list@lists.iem.at

142 participants
303 discussions

[hid] object alpha release
by Hans-Christoph Steiner 20 Oct '04

20 Oct '04

I just released an alpha test version of the [hid] object I am working on. I'd love to have any feedback people are willing to offer. I made it output a 4 part message, instead of using four outlets like [linuxevent] and it uses symbols instead of numbers to represent event types and codes. Its still GNU/Linux only, but I am working on the MacOS X version... http://at.or.at/hans/pd/hid.html .hc ________________________________________________________________________ ____ "If nature has made any one thing less susceptible than all others of exclusive property, it is the action of the thinking power called an idea, which an individual may exclusively possess as long as he keeps it to himself; but the moment it is divulged, it forces itself into the possession of everyone, and the receiver cannot dispossess himself of it." - Thomas Jefferson

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pd and rme hdsp rpm
by Roman Haefeli 20 Oct '04

20 Oct '04

hi sorry to bring this up again, but it's important to me: does anybody have any experience with pd and the audiointerface from rme: hdsp rpm? is it true that pd only supports interfaces with the same number of inputs and outputs? thanks roman

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Re: [PD] a/d/a and jackd alsa low-latency problems
by FrankBarknecht 19 Oct '04

19 Oct '04

Hallo, (I cc the list again, as it might help others later as well) thewade hat gesagt: // thewade wrote: > On Tue, 19 Oct 2004, Frank Barknecht wrote: > > The clean way is, not to run jackd nor Pd as root, but give both > > higher priorities. For Pd this unfortunatly means \"chmod +s > > /usr/bin/pd\" which is still more secure than running as root, and > > jackd can be started as normal user through \"jackstart\" if you have a > > capabilities-patched 2.4 or 2.6 kernel, or as user, if you use the > > realtime-lsm module. > > This describes one of the holes in understanding for me, as a result of > self-teaching linux. The +s is setuid bit, right? How does this increase > priority? I thought nice controlled priority... > Ive tried jackd -R ... as myself and it cannot initiate a thread, so I > proabably do not have capabilities, right? Even if I am running > 2.6.9-rc3-mm3-VP-T3? Nice also controls priority, but a) you cannot raise priority unless you are root, and b) there are different kinds of priorities. "Capabilities" is the word to remember in this context. To get a) out of the way, you can run applications as root, which will give a software all capabilities. Including the capability to crash your machine, to delete your harddisk or to send banking and mail ebay passwords of all users on your system to a hacker site. Many people try not to risk something like this. It's also not necessary to risk it, because getting at ebay passwords will not give you lower latency. To get lower latency, Pd or Jack only need to get "a little bit of root". They need to lock memory in RAM, so no random harddisk access by swapping will happen during low latency operations. And they need to get a higher priority when it comes to being served by the kernel prior to other processes. This is called SCHED_FIFO. M_LOCK and SCHED_FIFO are not normally changeable by software running as a non-root user. By doing a "chmod +s /usr/bin/pd" (or on Debian: "dpkg-statoverride --add root root 4755 /usr/bin/pd"), Pd gets "setuid root", which means, it will run with all priviledges root has. Including that ebay thing. But I'm personally convinced, that Miller is not interested in your ebay passwords. That's why Pd drops all root priviledges immediatly, after it has scheduled itself SCHED_FIFO and locked all memory. You can check this yourself: do the chmod. Find some file, that is not available to you normally, only to root. /etc/passwd or /etc/shadow are good candidates. Then create a simple patch and try to [read /etc/shadow cr( -> [textfile]. Although Pd is setuid root, it will not be able to read the file: error: /etc/shadow: can't open error: /etc/shadow: read failed Because after doing the M_LOCK and the SCHED_FIFO, Pd actually becomes *your* program again. However: For various technical reasons this does not work with jackd. If you setuid root jackd, you're effectivly shutting out all non-root access to the jack-server. For Jack, there are two alternative routes: One is using jackstart and the so called "Capabilities patch". The other involves the realtime-lsm module for kernel 2.6.x. The C. patch is described in detail on the jackit.sf.net page: You need to edit one kernel header, then recompile and use jackstart to start jackd. jackstart needs to be setuid root, jackd must not be setuid root. A/DeMuDi or Planet CCRMA with kernel 2.4.X do it this way. The realtime-lsm module OTOH allows you to define a user or a group of users (often the group called "audio"), that can access the M_LOCK and SCHED_FIFO capabilities without being root. In that case, at least jackd doesn't have to be setuid root, I don't know if this works with Pd as well without pd being setuid too, but I think, it will. (I still run a C. patched kernel.) > > Whooho, 64 already is *very* small. I never heard of anybody run > > jack with 32. That\'s almost hard-realtime! > > Perhaps the smallest buffersize I can get with my Hammerfall > Multiface is 64. When I run jackd -v Im only using one quarter of my > available time though... It's not clear to me, what "time" are you talking about here? CPU time has nothing (or not much) to do with low latency. Pd's lowest latency is always a lot bigger than Jack's anyway, because Pd is using an auxiliary buffer. Latency is the maximum time needed to *react* to something. It's not a measure of system load or so. A period of 64 with "-n 2" will give you a latency at CD quality of 2*64/44100 = 3 msecs. That's very low latency. With 32 it will become 1.5 msecs and with 8 it will be a latency of 0.3 msecs. I'm normally very happy with 128 or 256 on my laptop, which at 48kHz will be a latency of 10 msec, but that's a stable latency. Ciao -- Frank Barknecht _ ______footils.org__

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which book
by mählpeak 19 Oct '04

19 Oct '04

hello!!! curtis roads computer music tutorial or dodge and jerse computer music:synthesis,composition,performance ??? i'd be glad if someone tells me which is overall better... thanx -- -- there are two kinds of people: those who finish what they begin

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readir XP, folderglider -> folderspiller, bug in zexy 1.3
by Thomas O Fredericks 19 Oct '04

19 Oct '04

Folderglider has been split into 2 abstractions : folderglider (a new version to be released) and folderspiller (a simpler version). Folderspiller spills the contents of a selected directory following a certain criteria. Folderspiller needs TOT and ZEXY 1.3 Btw, there is a bug in l2s on XP : it outputs twice (attached is an example and my fix). Note : folderspiller does not require zexy_l2s_bug.pd to function, but please include folderspiller-help.pd if you redistribute. tom tom(a)danslchamp.org

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DV ieee1394, gem and pd: Part 2
by thewade 19 Oct '04

19 Oct '04

Hello again again, I was looking through the source code for gem and saw pix_dv, so I tried that out. Here is some of the output: video4linux ieee1394 for linux GEM: Start rendering error: GEM: pix_dv: define DV(IEEE1394) for your OS What does this mean? It looks like I have IEEE and then later it looks like I dont... -thewade

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[GEM] pix_coordinate in OS X
by Mirko Petrovich 19 Oct '04

19 Oct '04

Hi all I noticed [pix_coordinate] behaves different in os x and linux. In patch 02.TexCoord, the texture is repeated in Linux and in osx it looks clipped. I wonder if this object is broken or there is a new syntax for the values ? Saludos Mirko

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pd-crash with "tot"
by oliver 19 Oct '04

19 Oct '04

hi, list, krzysztof just discovered a very weird way to crash PD. it happens when both a [MouseState] (from the "cyclone" library) and a [tot] object are created in the same patch. attached is an example that demonstrates the hillarious effect ;-) needs libraries "cyclone" (or just "hammer") and "tot" i'm on XP professional, PD 0.37.2 hammer 0.1, 47th alpha build tot, 11th alpha build i would be happy for any solution of the problem... ciao oliver -- //////////////////////////////////////////////////////// \\\\\\\\\\\\\ http://klingt.org/ground/lift \\\\\\\\\\\\ ///////// http://klingt.org/executive-ensemble ///////// \\\\\\\\\\\\\ http://klingt.org/~oliver/prb \\\\\\\\\\\\ //////////////////////////////////////////////////////// \\\\\\\\ LIVE-BUILDER (music improvisation tool): \\\\\\ /////// http://klingt.org/~oliver/pd/live-builder ////// \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ #N canvas 296 585 710 316 12; #X text 29 22 [tot] and [MouseState] in the same patch cause PD to quit.; #X text 31 50 libraries are: hammer 0.1 \, 47th alpha build; #X text 151 66 tot 0.1 \, 11th alpha build; #X text 33 114 1.) click this first; #X text 33 184 2.) then this; #X msg 67 138 \; pd-pd-crash.pd obj 500 160 MouseState; #X msg 67 207 \; pd-pd-crash.pd obj 500 200 tot;

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writing~ to a table at arbitrary position
by Chris McCormick 19 Oct '04

19 Oct '04

Ey, Couple of years ago I needed to write~ to a table changing the write pointer position on the fly: http://iem.at/mailinglists/pd-dev/2002-09/000292.html Seems that this never made it into the official version. Someone else mentioned tabwrix~ at the time: http://iem.at/mailinglists/pd-dev/2002-09/000279.html But I can't find a current version of this around at the moment. So what's the lowdown on setting the write position of tabwrite~? Is there an external to do this? Should I just patch my pd source again? Best, Chris. ------------------- chris(a)mccormick.cx http://mccormick.cx

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Devel_0_37 Compile: undefined reference to `copyvec'
by Ian Smith-Heisters 19 Oct '04

19 Oct '04

Hi all, I'm trying to compile the latest cvs devel_0_37 and keep getting the following error: g_io.o(.text+0x78b): In function `vinlet_perfsimd': : undefined reference to `copyvec' collect2: ld returned 1 exit status make: *** [../bin/pd] Error 1 The output of ./configure --prefix=$HOME/pd --enable-alsa --enable-jack --enable-fftw --enable-threadedsf follows. Looks a-ok to me. I tried compiling without --enable-fftw and --enable-threadedsf and I still got the same problem. Let me know if there's any more information I can give you to help sort this out. Thanks, Ian checking for gcc... gcc checking for C compiler default output file name... a.out checking whether the C compiler works... yes checking whether we are cross compiling... no checking for suffix of executables... checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc accepts -g... yes checking for gcc option to accept ANSI C... none needed checking for a BSD-compatible install... /usr/bin/install -c checking whether make sets $(MAKE)... yes checking how to run the C preprocessor... gcc -E checking for an ANSI C-conforming const... yes checking for egrep... grep -E checking for ANSI C header files... yes checking for sys/types.h... yes checking for sys/stat.h... yes checking for stdlib.h... yes checking for string.h... yes checking for memory.h... yes checking for strings.h... yes checking for inttypes.h... yes checking for stdint.h... yes checking for unistd.h... yes checking for pid_t... yes checking for size_t... yes checking whether time.h and sys/time.h may both be included... yes checking for ANSI C header files... (cached) yes checking fcntl.h usability... yes checking fcntl.h presence... yes checking for fcntl.h... yes checking limits.h usability... yes checking limits.h presence... yes checking for limits.h... yes checking malloc.h usability... yes checking malloc.h presence... yes checking for malloc.h... yes checking sys/ioctl.h usability... yes checking sys/ioctl.h presence... yes checking for sys/ioctl.h... yes checking sys/time.h usability... yes checking sys/time.h presence... yes checking for sys/time.h... yes checking for unistd.h... (cached) yes checking bstring.h usability... no checking bstring.h presence... no checking for bstring.h... no checking whether gcc needs -traditional... no checking return type of signal handlers... void checking for vprintf... yes checking for _doprnt... no checking for gettimeofday... yes checking for select... yes checking for socket... yes checking for strerror... yes checking for dlopen in -ldl... yes checking for sin in -lm... yes checking for pthread_create in -lpthread... yes checking for shm_open in -lrt... yes checking for jack_set_error_function in -ljack... yes checking for jack_set_xrun_callback in -ljack... yes checking for fftwf_plan_dft_r2c_1d in -lfftw3f... yes checking for X... libraries /usr/X11R6/lib, headers /usr/X11R6/include checking for XCreateWindow in -lX11... yes checking for main in -ltcl8.7... no checking for main in -ltcl8.6... no checking for main in -ltcl8.5... no checking for main in -ltcl8.4... yes checking for main in -ltk8.4... yes checking tcl.h usability... no checking tcl.h presence... no checking for tcl.h... no checking tcl8.4/tcl.h usability... yes checking tcl8.4/tcl.h presence... yes checking for tcl8.4/tcl.h... yes OPT_CFLAGS --------------- -O3 -funroll-loops -fomit-frame-pointer configure: creating ./config.status config.status: creating makefile

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Pd-list October 2004