Linux-audio-dev March 2007

linux-audio-dev@lists.linuxaudio.org

79 participants
63 discussions

[linux-audio-dev] Hi, is it possible to record multi channel speech audio and down sample it 2 stereo channels BUT with horizontal audio positioning of each audio channel ie. like dolby surround effect. I'm not looking to make multi channel podcast, just a plain stere

by Valent Turkovic

Hi, is it possible to record multi channel speech audio and down sample it 2 stereo channels BUT with horizontal audio positioning of each audio channel ie. like dolby surround effect. I'm not looking to make multi channel podcast, just a plain stereo podcast. Ok, not just plain, maybe better term is enhanced podcast with "dolby surround" or "binaural" effect so that different voices appear to be coming from different positions. The idea is to make a podcast with 5 (or more/less people) and record each of them individually and to make an stereo file for distribution but such that each person has a distinct "location" in your ear. So you can hear that person A is in front of you, person B is on the far left, person C is to the right but closer to center... and so on. I would maybe have 3 channels sometimes and sometimes maybe 7 channels, it differs by the amount of guests there are in each podcast show. Is there some linux audio tool which I could feed 3-7 wav tracks and define where in horizontal space I want each channel to be located - and it makes final stereo track with this "binaural" or "Dolby surround" enhanced podcast? Thank you in advance. -- http://kernelreloaded.blog385.com/ linux, blog, anime, spirituality, windsurf, wireless registered as user #367004 with the Linux Counter, http://counter.li.org. ICQ: 2125241 Skype: valent.turkovic

18 years, 10 months

[linux-audio-dev] ANN: munger1~ minor update

by Ivica Ico Bukvic

http://ico.bukvic.net/Max/munger1~_1.0.1.tar.gz (includes changelog and install how-to documentation fixes) Best wishes, Ivica Ico Bukvic, D.M.A. Composition, Music Technology, CCTAD, and CHCI Virginia Tech Dept. of Music - 0240 Blacksburg, VA 24061 (540) 231-1137 (540) 231-5034 (fax) ico(a)vt.edu http://www.music.vt.edu/people/faculty/bukvic/

18 years, 10 months

Re: [linux-audio-dev] Hi, is it possible to record multi channel speech audio and down sample it 2 stereo channels BUT with horizontal audio positioning of each audio channel ie. like dolby surround effect. I'm not looking to make multi channel podca

by Valent Turkovic

On 3/13/07, Georg Holzmann <georg.holzmann(a)student.kug.ac.at> wrote: > Hallo! > > > I'm not looking to make multi channel podcast, just a plain stereo > > podcast. Ok, not just plain, maybe better term is enhanced podcast > > with "dolby surround" or "binaural" effect so that different voices > > appear to be coming from different positions. > [...] > > Is there some linux audio tool which I could feed 3-7 wav tracks and > > define where in horizontal space I want each channel to be located - > > and it makes final stereo track with this "binaural" or "Dolby > > surround" enhanced podcast? > > Yes, there are various implementations of binaural spatialization in > Pure Data (and I guess also in Supercollider and CSound ...). > > I am just making some ready-made tutorial patches regarding this topic > for the linux audio conference - so if you wait some days you can have > them ! > > LG > Georg > Great! I would love to gave it! Thank you in advance. Valent.

18 years, 10 months

[linux-audio-dev] ANN: munger1~ port (from the Percolate library) with new stuff

by Ivica Ico Bukvic

Greetings all, For the impatient, download at: http://ico.bukvic.net/Max/munger1~_1.0.0.tar.gz (270KB, includes source, Linux-Pd-i386, Mac-Max-i386, and Win32-Max-i386 binaries, and 3 cases of beer) OVERVIEW ======== munger1~ (March 12, 2007 1.0.0 release) a realtime multichannel granulator a.k.a. the swiss-army-knife of realtime granular synthesis a flext (cross-platform PD & Max/MSP) port of the munger~ object from the PeRColate library (0.9 beta5) http://www.music.columbia.edu/PeRColate/ Original PeRColate library by: Dan Trueman http://www.music.princeton.edu/~dan/ R. Luke DuBois's http://www.lukedubois.com/ Flext port and additions by: Ivica Ico Bukvic http://ico.bukvic.net Ji-Sun Kim hideaway(a)vt.edu http://www.music.vt.edu http://www.cctad.vt.edu Released under GPL license (whichever is the latest version--as of this release, version 2) For more info on the GPL license please visit: http://www.gnu.org/copyleft/gpl.html ACKNOWLEDGEMENTS ================ Many thanks to Dan Trueman for open-sourcing this great object! SOURCE INSTALL ============== If you simply intend to use prebuilt binaries, please skip to the INSTALL section. Otherwise take a big breath and read on... 1) You need stk library which can be downloaded from: http://ccrma.stanford.edu/software/stk/ 2) You need to also install latest flext library (this is a library that allows for creation of externals for both Max/MSP and PD using the same source). Version 0.4.x can obtained from the following link: http://grrrr.org/ext/flext/ Latest CVS version (0.5.1) is found in the Pure-Data CVS (this one is recommended): http://sourceforge.net/cvs/?group_id=55736 3) If you are using latest CVS version (0.5.1) Before compiling the source you will need to add the following to the top of the flext/source/flstk.h file right below the #define __FLSTK_H: #ifdef PI #undef PI #endif This step will probably become quickly obsolete once Thomas updates CVS. Until then, this is needed to be able to compile flext against stk. 4) To compile flext, read flext instructions (it boils down to running build.sh with appropriate parameters and then editing two simple config files, i.e. "build pd gcc build" or "build max gcc" or "build max msvc" etc.) Your will need to edit buildsys/config-<platform-compiler-pdormax>.txt to adjust paths to various folders. Then you will need to edit config.txt file. You do not need to include SndObj for this external but you do need stk option to be properly set. On Windows+MSVC, STK flag at the time of this release does not work, so you will have to use included testmunger1 MSVC project file and adjust path settings to compile munger1~. 5) Once stk and flext are compiled, go into munger1~ folder and type: <path to flext folder>/build.sh <platform> <compiler> <build/clean/install> NB: on Mac <build/clean/install> is not needed. On Windows, please use MSVC and open the testmunger1 project file in the root of the folder. 6) Once compiled, your binary will be created in a <maxorpd-platform> subfolder (i.e. pd-linux, or max-darwin), followed by another subfolder which reflects whether a threaded or singlethread flext was used. Inside you will find your external. INSTALL ======= You can either use the prebuilt externals (found in the bin/ folder) or ones built using the "SOURCE INSTALL" instructions above. Binaries are provided for Intel-based Macs, Win32, and Intel-based Linux OS. The included prebuilt binaries DO NOT REQUIRE you to install flext or stk as these are statically linked. 1) Copy the external in your externals folder (i.e. /usr/lib/pd/extra or C:\Program Files\Cycling '74\MaxMSP 4.6\Cycling '74\externals\, or "Applications/MaxMSP 4.6/Cycling '74/externals) 2) Copy appropriate help file (found in the help/ folder) into the help folder (i.e. /usr/lib/pd/doc/5.reference or C:\Program Files\Cycling '74\MaxMSP 4.6\max-help, or "Applications/MaxMSP 4.6/max-help) NB: Pd help file has a ".pd" extension, while Max/MSP help file has a ".help" extension. 3) Start your app (PD or Max) and create object called munger1~. Right-click (ctrl-click on Macs) and select "help" and this should open the help file with additional documentation. Questions? See OVERVIEW for contact and Q&A info. Enjoy! FAQ === The following is Ico's FAQ, so it may or may not reflect other project participants' opinions, including original author(s) of munger~, flext, etc. Q: Why porting to flext? A: Flext library (by Thomas Grill) is a layer which allows creation of externals for both Max/MSP and PD without any alterations to the code (obviously once it is adapted to use flext). While there have been a number of Max/MSP <-> PD external ports in the past, many of them have become outdated because such attempts required either maintaining one code full of ugly #ifdefs, or worse--maintaining two sources. Either way, what usually turned out to be the case is that original authors did not have the time, interest, or simply the software/hardware to deal with the newly generated overhead and/or test the code, while volunteers who made the original porting efforts eventually moved on to other projects. The result was/is outdated and/or broken externals. Flext circumvents this problem by allowing one clean code to compile on both platforms while also supplying in many cases cleaner (more legible) API and (as a whipped cream on top) object-oriented environment (C++). Q: Why bother with PD <-> Max/MSP cross-platform compatibility... ...when I use only <insert-your-favorite-application-here>? ...<insert-your-favorite-application-here> is better? A: Choice is what makes us human (this is also what makes Arts so vibrant and exciting). And while everyone's welcome to express their own preferences, we also have to realize that in this case these same preferences are also the main cause of a virtual divide which manifests itself at everyone's detriment. Wouldn't it be nicer if we could share externals transparently, or even better, open PD patches in Max and vice-versa? This would help in both the cross-pollination of ideas as well as creative efforts. This project has also taught me that creating flext-ready externals is as easy if not easier (due to the aforesaid API's legibility) than native objects (whether that be PD or Max/MSP). Finally, if all else fails, such externals are bound to reach wider audience, and are much easier to maintain if cross-platform compatibility is to be pursued. Q: If flext is so cool, why don't we see more porting efforts? A: Good question. The fact is that flext is much more widely known among PD users than it is among the Max/MSP community, so this seemingly one-way road may have contributed to the current situation. One could only hope that projects like this may help reverse this unfortunate trend. Q: So, is all really that peachy in the flext-land? A: Well, our lives teach us that nothing is truly free in this world. Flext is no exception. Its "fees," however are not tied to our checkbooks. Rather, they manifest themselves in a slightly greater CPU overhead in signal flow due to message translation. Thus, one could consider flext a "middle-person" between the <app-of-your-choice> and the external. This, however, in today's world is so negligible that during the testing phase I was unable to measure any noticeable CPU-overhead difference. Another consideration is that flext might not be complete (see KNOWN ISSUES for an example). That being said, in its current state it did the trick for a relatively complex external such as munger~ or even FFTEASE collection which had been ported several years ago. All this leads me to believe that it is more than ready for the day-to-day use. Q: I already have Dan and Luke's awesome PeRColate lib. Why should I download this one? A: This is a cross-platform port of the latest version with several new features. Thus, it allows for those platforms which have not had the beta6 available (Linux, Windows) to finally dig into all the goodies it brings. Plus you also get the cool stuff such as verbose modes, discrete panning, more thorough documentation, up to 500 grains per sample (instead of 50), up to 24-channel output (instead of 2 or 16, depending which one you used), etc. KNOWN ISSUES ============ munger1~ has been tested extensively on Linux+PD, OSX+Max/MSP and Win32+Max/MSP setups, suggesting that it should work on other setups as well. Your mileage may vary, though. Currently there is only one known issue in the wild which requires changes to flext in order to be fixed. Namely, if you use munger1~ object in conjunction with an external buffer in PD (known as an array) and if you dubiously decide to delete that particular buffer in the middle of your performance while munger1~ is still associated with it, this will [unsurprisingly] crash PD. Max/MSP currently has a check implemented against that via flext layer so Max/MSP will simply stop outputting anything until buffer is reset. The flext author is aware of this and PD fix should appear in the flext CVS hopefully soon. That being said, the lingering question is why would you want to do this in the first place... FYI, even though munger1~ allows up to 500 simultaneous grains per sample and has been compiled with all available optimizations (SSE, Altivec is supposedly available via flext but has not been tested), on MBP (Core Duo 1.83GHz) I was unable to get more than 160 simultaneous grains per sample (or ~32,000 grains/second) without dropouts, even though CPUs were not getting maxed out, so something else might be the cause of this limitation (flext?). Win32 machine (3-year old AMD64 3000+) fared marginally better at around 165 simultaneous grains per sample (or ~33,000 grains/second) before its CPU was maxed out. Linux on the same AMD64 3000+ hardware fared the best. It topped off at 47,999 grains per second at 48KHz sampling rate which for some reason the sampling rate appears to be the upper limit (i.e. if you run PD or Max/MSP at lower sampling rates, your upper limit will be restricted to the sampling rate), even though the code allows for multiple initiations of grains per cycle. This, however, is also the way original munger~ works. An interesting bit is that while on Linux/PD combo 48K grains are already reached when we get 64 simultaneous grains, on Win32/Mac even 160 simultaneous grains yield only ~32-33K grains. Could this be a flext bug? Best wishes, Ivica Ico Bukvic, D.M.A. Composition, Music Technology, CCTAD, CHCI Virginia Tech Dept. of Music - 0240 Blacksburg, VA 24061 (540) 231-1137 (540) 231-5034 (fax) ico(a)vt.edu http://www.music.vt.edu/people/faculty/bukvic/

18 years, 10 months

[linux-audio-dev] LFO Phaser LADSPA plugin in details

by Andrew Gaydenko

Hi! Will anybody find a minute ot two to explain me how does the plugin work - I mean a user POV rather technical realization details. Andrew

18 years, 10 months

[linux-audio-dev] note: apps.linuxaudio.org

by Robin Gareus

There have been a few edits on our "deveopment"-wiki apps-devel.linuxaudio.org ! sorry for the confusion: http://apps.linuxaudio.org is the "real" site. http://apps-devel.linuxaudio.org/ is our *test server* that we use to experiment with PHP, plugins, designs, software updates, etc - it's actually a 1:1 mirror, but not intended for the public. - we ought to set up a jailed webserver behind openvpn for testing, but we're just not there yet :( robin

18 years, 10 months

Re: [linux-audio-dev] distros: don't package hexter 0.6.0

by Chris Cannam

> a configuration option Build configuration, or DSSI configure() ? The latter would fix it, while (it seems?) the former would mean distros having to choose between better sound and project compatibility on behalf of their users, which is not much of a choice. If you do mean the latter, then your previous fix seems better - a user can always choose to downgrade, or a packager find creative ways to provide both. I suppose a packager could include libraries built both with and without the option... but that's a compatibility minefield (with other ad-hoc packages from other distros). Hoping you did mean DSSI configure, Chris

18 years, 10 months

[linux-audio-dev] distros: don't package hexter 0.6.0

by Sean Bolton

Hi all, If you're thinking of packaging hexter 0.6.0 for your favorite distribution, please wait for version 0.6.1. I've been talking with Anthony Green about his efforts to package hexter 0.6.0 for Fedora, and it seems I made a mistake. hexter 0.6.0 can sound radically different from hexter 0.5.9, depending on the patch used, and I didn't want anyone's existing projects to break if they upgraded. So I changed the way hexter 0.6.0 installs: it installs as hexter6.so, while hexter 0.5.9 installs as hexter.so, so the two versions can coexist. This works well enough for people who install from source, but Anthony pointed out that this makes things difficult for people packaging hexter for distributions. For most distros, when one upgrades, the old files are removed, meaning hexter.so would disappear and existing projects would break. Distros with something akin to Gentoo's SLOT mechanism can have multiple versions installed simultaneously, but the majority of hexter users will have no need for anything but the latest version. What I'm going to do with version 0.6.1 instead is make it install as hexter.so, just like 0.5.x versions, and add a configuration option which will optionally make it sound like 0.5.9. Problem solved: existing projects can easily be made to sound like they originally did, and everyone can have the latest and greatest hexter installed. Expect 0.6.1 sometime this coming week. Thanks, Sean Bolton

18 years, 10 months

[linux-audio-dev] [ANN] Mammut V0.59

by Kjetil Svalastog Matheussen

*About: Mammut will FFT your sound in one single gigantic analysis (no windows). These spectral data, where the development in time is incorporated in mysterious ways, may then be transformed by different algorithms prior to resynthesis. An interesting aspect of Mammut is its completely non-intuitive sound transformation approach. *Homepage: http://www.notam02.no/arkiv/doc/mammut/ *Screenshot: http://www.notam02.no/arkiv/doc/mammut/mammut.png Changes 0.57 -> 0.59 --------------------- -Added workaround for rare sound corruption bug. -Added the "Redo it!" buttons. (The same as pressing "Undo" + "Do it!") -If playing while pressing a "Do it!" or "Redo it!" button, continue playing after processing as well. -Added the "Random Phases" toggle button in the "Multiply Phase" dialog. Checking this button will freeze the sound. Thanks to Tim Blechman for the idea. -Fixed looping which wasn't turned off if using a different sampling rate. -Added "make install" and "make uninstall" -Fixed animation bug. (should allways be shown now) -Fixed a couple of more int->uint32 time variable cases. Hopefully, the animation stuff shouldn't stall the machine anymore.

18 years, 10 months

[linux-audio-dev] List migration to linuxaudio.org : remaining issues.

by Marc-Olivier Barre

Hi everyone, As I said yesterday when I said the migration to linuxaudio.org was postponed till 1st April, there are still a few issues asking for comments. It has been suggested by a few people(Ivica Ico Bukvic, Jan Weil) that the email addresses linux-audio-xxxxx(a)linuxaudio.org was kind of redundant. The following suggestions were made : ¤ just switch the names to announce(a)linuxaudio.org, dev(a)linuxaudio.org, and user(a)linuxaudio.org. ¤ Make aliases : linux-audio-dev(a)linuxaudio.org -> dev(a)linuxaudio.org To this Leonard Ritter replied that this could lead to more spam. IMO, since we are working on a spamassassin+mailman interfacing, it should not be a problem. The aliases seem the solution that could make everyone happy since both type of addresses would work and the lists would keep their "historical" names. Ready, steady... FLAME ! __________________ Marc-Olivier Barre, Markinoko. PS : please reply to both lists (I'll try to be swift on moderating users that are not registered on both lists) so everyone can enjoy your comments :-)

18 years, 10 months

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Linux-audio-dev March 2007