Pd-list February 2005

pd-list@lists.iem.at

137 participants
200 discussions

OpenAL with Pd? ...similar to Gem?
by Mike Wozniewski 03 Mar '05

03 Mar '05

Hi all, I was wondering if there has been any effort in developing OpenAL objects for Pd? The 3D spatialization features of OpenAL are quite interesting to our group, and we are thinking of ways to direct Pd audio signals to an OpenAL output engine. I thought I'd ask first if anyone has tried anything of this sort before? There should also be some interaction with Gem in this case - because OpenAL is heavily influenced (in terms of syntax and model) by OpenGL, and users would probably like to use the two together. For example, we are creating a virtual 3D world where sound objects are graphically represented with Gem, and hence their audio would be spatialized in the same 3D coordinate system. The first fundamental obstacle that we see is that of resource management. ie, which engine should have access to the soundcard drivers? OpenAL has sources, and listeners. For sources, we can simply stream a Pd audio signal into an OpenAL buffer queue. This should be easy since these buffers live in regular memory. But listeners are a function of the soundcard, channel specifications, and speaker setup. This is more low level and might conflict with Pd. Any thoughts? ...thanks in advance for any comments! Cheers, -Mike Some references: Full user-guide: http://www.openal.org/openal_webstf/specs-annote/oalspecs-annote.pdf OpenAL explained: http://www.linuxdevcenter.com/pub/a/linux/2000/10/13/oa_openal.html

3 2

[pmpd] - meaning of messages
by Frank Barknecht 03 Mar '05

03 Mar '05

Hi, I have a couple of questions regarding the [pmpd] object. It is not quite clear to me, what the messages to this object mean exactly. Actually I'm very confused about them. As I see it, there are basically four messages possible to create the dynamic system: mass, link, in, out. All of these take IDs as arguments. I don't understand the meaning of those IDs. For example to create a mass, one uses messages like: mass ID MASS X MASS and X are easy, but what is this "ID" used for? "link" also takes IDs as argument, but it seems to ignore the ID given to a mass on creation, instead it seems to use its own IDs and it has an ID itself: link LINK-ID MASS1-ID MASS2-ID K D Where do I get the mass IDs from? In my experiments, it seems just have to keep track of them myself, and they have nothing to do with the ID I gave to a mass earlier. Or do I get it wrong? Outlet creation (and inlet creation respectively): As I understand it, the format is: out OUT-ID OUTLET MASS-ID AMPLITUDE AMPLITUDE seems to be a scaling factor. OUT-ID I don't understand at all: what use does it have? Am I right to assume that OUTLET is numbered from 0 to max-outlet-number, where max-outlet-number is the second argument of pmpd minus one? And then MASS-ID: Does it start from 0 as well? Or from 1? Where do I get this ID from? In my experiments, it seems to have to be the MASS-ID I used when creating the "link"s. Sorry for my confusion... Ciao -- Frank Barknecht _ ______footils.org__ _ __latest track: fqdn _ http://footils.org/cms/show/38

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question about video playback, Framestein
by David Merrill 02 Mar '05

02 Mar '05

Hello pd-folks, I have a general question about video playback, and a specific one about Framestein that I would greatly appreciate your expertise on: video playback: what's the best way to do this? (if I have a .avi, or some other format that I want to play fullscreen, and advance frames in response to other PD events) I read a little about GEM and it seems very good for 3D rendering, but it was not clear to me if it can be used for video - so Framestein seemed like the obvious choice. Am I correct in this? Framestein: I've got it installed, and am trying to get to a "hello world" using the 01.example-video patch. Framestein seems to start ok, then after I drag an .avi into the window, I try to scrub it with the horizontal slider. Almost nothing happens with the video, and I get a series of messages from pd saying: "netsend blocked X msec" where X is an integer like 6,5,98,etc.. I also tried changing the endpoints on the slider to no avail. I am using pd.37-1 and Framestein 0.32 Any ideas would be greatly appreciated, -David Merrill -- MIT Media Lab dmerrill(a)media.mit.edu

4 3

pas GOP, GOP
by ydegoyon＠free.fr 01 Mar '05

01 Mar '05

hi, 'Unauthorized pd' now supports GOP !! ( grid, playlist, pianoroll, ... ) well, only the linux versions that are on my site. yipee, for no special occasion, i'm not using GOP too much. i just get this error message when i load some GOP patches : Consistency check failed: canvas_create_editor but it doesn't seem to hurt further. anyway, if someone have a clue about that error, let me know. saludos, sevy

5 5

system call timed out
by pd＠plakatif.net 01 Mar '05

01 Mar '05

hello, finally i succeeded in installing pd 037 (rpm->deb package) on my debian laptop. after starting pd on the command line, all i get is just "system call timed out", while i'm not able to open anything, or create from the small gui window. does pd log errors somewhere, does anybody know what might be happening here ? thank you, jyrgen

3 3

pdp/pidip video playback quicktime?
by David Merrill 01 Mar '05

01 Mar '05

Hey pd-ers, I've tried every .mov file I have with pidip (the example quicktime.pd patch), and for all of them it says: pdp_qt: WARNING: unsupported video codec pdp_qt: ERROR: no usable video stream found. how can I get the codecs I need to use pdp\pidip in this way? (I am running ubuntu linux, so any debian know-how should help) much appreciated, -David M.

2 1

Repairing wav files written by pd 64bit
by thewade 28 Feb '05

28 Feb '05

Hello list! I figured out that like readsf~ on pd 64-bit, writesf~ doesnt write correct headers. I can play the files with aplay using -f dat as that forces the correct header settings. Now how do I repair the files header directly so that I may use these files in other programs? I tried using sox but I couldnt get it to work: sox test.wav -r 48000 -c 1 test2.wav sox: Failed reading test.wav: WAVE header not found Thanks for the help! -thewade ps. The test wave file is attached to the bug I submitted on sourceforges bugtracker. Its not worth hearing, just a test tone. http://sourceforge.net/tracker/index.php?func=detail&aid=1122560&group_id=5…

1 0

dbtorms amplitude scaling sounds wrong
by Stefan Turner 28 Feb '05

28 Feb '05

Hi list, I'm using dbtorms for amplitude control as follows: signal in volume (0 to 100dB) | | | [dbtorms] | | | [$1 50< | | | [line~] | / [*~] | [dac~] This is AFAIK the correct way to use it. The problem is, the amplitude scaling doesn't sound right to my ears. 100dB is the loudest and 0dB is silence all right, but 50dB is extremely quiet. I thought that dB in this case are supposed to represent 'loudness', so 50dB should sound half as loud as 100dB? To me 'halfway' seems to be somewhere between 80dB and 85dB. Is it my patch or my ears? Thanks Stefan Turner Send instant messages to your online friends http://uk.messenger.yahoo.com

3 4

gem video mixing does not work as before?
by Max Neupert 28 Feb '05

28 Feb '05

hi, the video mixing as described in the gem tutorial http://taproot.dyndns.org/~cgc/tutorial_gem/tutorial8.html used to work nicely but now it does not anymore. is it just me (my system) or did something change? thanks for checking. -- Max Neupert Fachgebiet Kunst & Medien Hochschule für Kunst und Design Burg Giebichenstein Halle, Deutschland

2 2

Audio Unit
by Niklas Saers 28 Feb '05

28 Feb '05

Hi, I was wondering if anyone knows of any efforts into making audio unit plugins on OS X available to Pd, or making Pd objects into audio units plugins? Cheers Nik

2 1

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Pd-list February 2005