Linux-audio-dev

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7533 discussions

[linux-audio-dev] Low-latency audio over IP

by asbjs＠stud.ntnu.no

I am working on what is called "distributed multimedia interaction", one purpose of which is to investigate possibilities for ensemble playing by remote parties, distributing the audio over IP networks. A crucial point is to achieve audio transmission with very low latency. If anyone could provide me with information on, or pointers to, open-source software for doing this, I would be grateful. (I have started to roll my own, but I can hardly defend duplicating work unnecessarily.) Other comments are of course also appreciated. With kind regards Asbjørn Sæbø -- Asbjørn Sæbø, post.doc. Centre for Quantifiable Quality of Service in Communication Systems Norwegian University of Science and Technology <URL: http://www.q2s.ntnu.no/ >

21 years, 2 months

[linux-audio-dev] Re: Low-latency audio over IP

by lazzaro

On Nov 12, 2004, at 9:05 AM, Asbjørn Sæbø wrote: > I am working on what is called "distributed multimedia interaction", > one > purpose of which is to investigate possibilities for ensemble playing > by remote parties, distributing the audio over IP networks. Listen to recordings, and see links off of the "Research Projects" section, of: http://ccrma.stanford.edu/~cc/ Also see: http://www.cim.mcgill.ca/~jer/research/rtnm/history.html Also see: http://www.cs.berkeley.edu/~lazzaro/nmp/index.html And if MIDI is a part of your system, I encourage you to look at RTP MIDI: http://www.cs.berkeley.edu/~lazzaro/sa/pubs/txt/current-rtp-midi.txt http://www.cs.berkeley.edu/~lazzaro/sa/pubs/txt/current-guide.txt and its implementation in sfront: http://www.cs.berkeley.edu/~lazzaro/sa/sfman/user/install/ index.html#download --- John Lazzaro http://www.cs.berkeley.edu/~lazzaro lazzaro [at] cs [dot] berkeley [dot] edu ---

21 years, 2 months

AW: [linux-audio-dev] Low-latency audio over IP

by lists＠nescivi.de

Hi, --- Ursprüngliche Nachricht --- > > I would be very interested in any open source development in this > > direction! > > May I ask what your interests are? Are you working at related things? > I am interested to use this for Wave Field Synthesis. In the case of larger systems for that, it is necessary to distribute the audio over a network, to process it at different computers to supply sets of speakers with the right signals. For this a low-latency network is necessary, and sample-synchronisity. See my website at: http://gigant.kgw.tu-berlin.de/~baalman/ for info on the project I am working on. sincerely, Marije

21 years, 2 months

[linux-audio-dev] [ANN] Ecasound 2.3.5 released, website addr. changed

by Kai Vehmanen

Hello all, here's version 2.3.5. Not too many changes, but still enough to warrant a new release. I also want to use this opportunity for the following: <*****IMPORTANT NOTICE*****> Ecasound website address has changed. The new address is http://www.eca.cx/ecasound This replaces the old (but still functional) website at http://www.wakkanet.fi/~kaiv/ecasound/. Note that also all the subpages have been modified. I've added some redirect pages, but the old site will only be available for a limited time. Please update any links that point to the old website. And also, my email address has changed (see from). </*****IMPORTANT NOTICE******> CVS is tagged with 'v2_3_5' as usual, and here are the full details: --- 1. Summary of changes Various Mac OS X specific build issues have been resolved. Minor changes have been made to the OSS soundcard support to avoid limitations of certain OSS drivers. Many minor updates have been made to user documentation and to build system scripts. --- 2. What is Ecasound? Ecasound is a software package designed for multitrack audio processing. It can be used for simple tasks like audio playback, recording and format conversions, as well as for multitrack effect processing, mixing, recording and signal recycling. Ecasound supports a wide range of audio inputs, outputs and effect algorithms. Effects and audio objects can be combined in various ways, and their parameters can be controlled by operator objects like oscillators and MIDI-CCs. A versatile console mode user-interface is included in the package. Primary platform for running Ecasound is GNU/Linux. Ecasound can also be run on many UNIX-derived systems such as FreeBSD, Mac OS X and Solaris. Limited support for Windows is available through Cygwin. Ecasound is licensed under the GPL. The Ecasound Control Interface (ECI) is licensed under the LGPL. --- 3. Changes since last release * With this version, Ecasound can now really be compiled for MacOS X. This has been tested on various 10.3.x systems. Also JACK support is reported to work under OS X. * Website address has changed: http://www.eca.cx/ecasound replaces the old http://www.wakkanet.fi/~kaiv/ecasound address. Please update any links that point to the old address. Full list of changes is available at <http://www.eca.cx/ecasound/history.php>. --- 4. Interface and configuration file changes None. --- 5. Contributors Patches - Accepted code, documentation and build system changes Berndtgen Manfred (1) -- ecasignalview build error Kai Vehmanen () -- various Bug Hunting - Reports that led to bugfixes (items closed) jcw (1) -- MacOS-X build errors. kito -at- gentoo-org (1) -- MacOS-X build errors. Stéphane Letz (1) -- Builds errors related to JACK and MacOS-X. Paul Marquardt (1) -- Mac OS X build errors. Raul Megelas (1) -- OSS-devices with no GETBLKSIZE support. --- 6. Links and files Web sites: http://www.eca.cx (fi) http://ecasound.seul.org (us) http://ecasound.sourceforge.net (us) Source packages: http://ecasound.seul.org/download http://ecasound.seul.org/download/ecasound-2.3.5.tar.gz md5sum: bbc0c4d12c1d21a7e71fc1bdb9fb0e2b Distributions with maintained Ecasound support: See http://www.eca.cx/download.php -- http://www.eca.cx Audio software for Linux!

21 years, 2 months

[linux-audio-dev] Fw: Call for audio submissions - Linux Open Source Sound CD

by Xavier Amatriain

Interesting > >Date: Wed, 10 Nov 2004 16:14:51 +0000 (GMT) > >From: JakeHarries(a)aol.com > >Subject: Call for audio submissions - Linux Open Source Sound CD > > > > > >Hi > >Linux users may be interested in this. > >best, > >Jake > >-------------------------------------------- > >CALL FOR AUDIO SUBMISSIONS > > > >Linux Open Source Sound CD (L.O.S.S.) > > > >[Planned release date - April 2005] > > > >Deadline for submissions: 07-Jan-05 > > > >Access Space, Sheffield's lowtech digital arts organisation, is currently calling for submissions for a CD of audio produced with open source software, and the Linux operating system. > > > >There is no specific theme for the curated works, as the concept behind the project is freedom of all elements of music manufacture, encapsulating style, production software and distribution > >techniques. We hope to receive submissions covering a broad and eclectic range of styles, to represent the dynamic nature of > >contemporary open source audio culture. Therefore, contributions are invited from musicians of all types, programmers, sound artists or artists who use sound. > > > >The LOSS CD is to be released under a Creative Commons 'Sampling Plus' license, so as well as being produced with free software, the CD will also extend the ethos of the open source movement into its method of distribution. For more information about this license, please visit http://creativecommons.org. > > > >Please do not submit tracks if you are not willing to release your work in this manner. > > > >The LOSS project will develop not only through the CD release, but also through a website, aimed at being an ongoing portal for > >producers of open source music to showcase their work. This will also offer the works for redistribution under the Creative Commons licensing mentioned above. This website will be online later in the year at http://www.access-space.org/loss. > > > > > >How to submit your proposal: > > > >[A maximum of 2 tracks per artist, each between 20 seconds and 8 minutes in length.] > > > >Send a DATA CD containing the following files: > > > >- Your audio track(s) in .wav format, 16bit, 44.1khz in either mono or stereo. > >- A text document stating your name, contact details (email and mailing address), track title, track length, the software and > >operating system used for producing the track, and a declaration that your track does not infringe any copyrights or use any > >unlicensed material. > >- An optional screenshot (in .jpg or .png format) of your software setup - which may be used for artwork purposes. > > > > > >For more information, or to mail your submission: > > > >Linux Open Source Sound CD > >Access Space > >1a Sidney Street > >Sheffield > >S1 4RG > >0114 2495522 > >www.access-space.org > >loss(a)access-space.org > > > >Access Space is UK registered charity no: 1103837 > > > >Funded by Arts Council England, Yorkshire and Digital South Yorkshire. > _______________________________________________ iua mailing list iua(a)iua.upf.es http://iua-mail.upf.es/mailman/listinfo/iua _______________________________________________ iua-mtg mailing list iua-mtg(a)iua.upf.es http://iua-mail.upf.es/mailman/listinfo/iua-mtg ------------------------ Xavier Amatriain Music Technology Group Universitat Pompeu Fabra www.iua.upf.es/~xamat -------------------------

21 years, 2 months

[linux-audio-dev] Report from the ICMC

by Ivica Ico Bukvic

Hi all, I just wanted to share with you a quick report from the ICMC. The conference was much fun although many events were overlapping and therefore it was impossible to attend everything. A number of new open-source audio-oriented software was demoed many of which are also available for the Linux platform. My Linux demo went relatively well (apart from the 2 consecutive X-server crashes, courtesy of the crappy binary-only ATI's driver, and an odd issue where disconnect of hdsp pcmcia did not yield acknowledgment from the 2.6.7 kernel and therefore subsequent reconnect did not recognize the card's presence). There were ~20+ people in the audience at any given time throughout the presentation (some of them were there only for a portion of the presentation, so people kept coming and going). Stuff I demoed (in no particular order): *Jack *Freqtweak *Jamin *Pd/Gem *Latency tests *Ardour *Sweep *Rezound *Audacity *gAlan *Rosegarden *Qsynth/fluidsynth *ZynAddSubFX *VKeybd *Cinelerra *Blender *Xine/DVD playback *Spiral Synth Modular *KDE productivity Stuff I wanted to demo but ran out of time: *Hdsp latency/performance *RTcmix synthesis language *Supercollider *Csound Etc. Stuff I observed preparing and doing this demo (please understand that I have no idea whether these problems are result of my own setup or are justifiable bugs -- nonetheless I am including them here in hope they may shed some light towards their resolution): *ZynAddSubFx crashes when a lot of polyphony is created even though the cpu utilization is not topped-off *Jamin crashes when pushing limiters to the extereme (not consistently) *fluidsynth has some weird looping problems (I am trying to track this one down as apparently this is specific to my setup) *Ardour's real-time preview via sliding the timing bar does not work (I do have one release prior to the latest, though) *Spiral Synth Modular crackles a bit even with large buffer sizes when using OSS (haven't had the time to do exhaustive tests nor did I try using Jack object as of yet) *Audacity has some instabilities when used in conjunction with Jack *There is a real need for Jack to be able to restart (should a need for its restarting ever arise) without losing all of the connections Stuff that really rocked: *I was able to run Jack on my via82xx laptop soundcard using rt mode with 64x4 buffers (5.33ms at 44.1KHz) *almost* rock solid (there is still some issues due to crappy ATI driver and obviously 2.6.7 kernel that is still sub-par to the 2.4.x kernel series performance, but that mainly amounted to perhaps a 1 xrun/minute). *I was able (although after the demo) to run hdsp with 64x2 (2.9ms at 44.1KHz) *almost* rock solid (random occasional xruns but no xruns when adding new connections and/or apps to the Jack session). *I tested the PD with the hdsp's 64x2 buffer size and used the latency test patch by connecting audio out with audio in on the multiface and got ~6ms :-). The general reaction from the audience was quite positive as many of the users who even were familiar with the Linux Audio scene were impressed by the diversity and quality of the software offering as well as the flexibility of the Jack's framework and the overall user-friendliness of the UI/desktop environment. I would like to therefore use this opportunity to once more thank all of you for being such active and generous contributors to this great community. Without you none of this would have been possible! ---------------------- The panel on the "Standards from the Computer Music Community" was very much interesting as it covered many of the important facets of today's computer music scene, but also more importantly revealed some of the greatest strengths of Linux, including (but not limited to): *openness of the standards and therefore ability to generate umbrella meta-standards (i.e. LASH) *longevity *ability for a new standard to supersede the reigning old standard solely based on its merit (i.e. Alsa vs. OSS), and not due to its commercial PR and/or widespread use *Minimization of the misrepresentation of the standard's features and/or abilities Having had this wonderful opportunity to be a part of such panel (many thanks to Matt Wright for inviting me!) has truly reinforced and clearly defined the advantages as well as strong reasons for being a part of this community. Many thanks go to all of you who have generously offered your insight in these issues. Time permitting, I will post a more in-depth list of the ideas I've covered during the panel. Matt Wright should also have slides ready on his site sometime soon. Best wishes, Ivica Ico Bukvic, composer & multimedia sculptor http://meowing.ccm.uc.edu/~ico/ --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.788 / Virus Database: 533 - Release Date: 11/1/2004

21 years, 2 months

[linux-audio-dev] audio spectrometer

by Andrew Gaydenko

Hi! The aim is to make measurement mini-laboratory, in particular, to measure distortions of audio amplifier. Using JACK, I can route line ins/outs, find clean sine signal and get amplified one, and then route last to... Well, the questions are: - are there some graphical FFT frontend to see signal harmonics? - has anybody success experience here? - are there some caveats and traps in such measurement? I have 24/96 card (Terrateck Aureon 7.1) with (as I think :-) good DAC/ADC. So, I hope, measurements may be done at least for few first harmonics. P.S. Have tried LAU list without any response :-( Thanks! Andrew

21 years, 2 months

[linux-audio-dev] [ANN] dssi-vst 0.3

by Chris Cannam

dssi-vst 0.3 released! ====================== The 0.3 release of dssi-vst is now available. dssi-vst is a DSSI plugin wrapper for VST effects and instruments with GUI support, allowing them to be loaded into any DSSI host. It requires a fairly recent version of Wine (this calendar year at least). dssi-vst is available from the download page at http://dssi.sourceforge.net/ The main improvement since the initial 0.1 release is that dssi-vst now works correctly with plugins with complex GUIs that use back-channel information to communicate things like patch data to the audio plugin. In practical terms, this means that VSTs with test keyboard widgets, patch load and save, and other natty features in their GUIs should work properly as DSSI plugins without losing automatability for the true automatable parameters.

21 years, 2 months

[linux-audio-dev] [ANN] libDSP-5.0.0

by Jussi Laako

OK, a new stable release after a long while... This one has loads of new stuff vs previous stable. libDSP is a C++ library of digital signal processing functions. It also contains a wrapper for C. Assembler optimizations for E3DNow!, SSE2 and x86-64 (SSE2). Either http://libdsp.sf.net or http://www.sonarnerd.net/projects/libdsp/ -- Jussi Laako <jussi.laako(a)pp.inet.fi>

21 years, 2 months

[linux-audio-dev] [RFC] C++ wrapper for JACK API

by Jussi Laako

I believe there are many C++ implementations of JACK API, but I'll add my 50 cents to the game anyway. I created this for my own applications, and this is very new and untested piece of code. Anyway, I welcome any comments on this and hopefully this code could be useful to someone else too. A basic JACK application made using this library works OK anyway. Current implementation is available from: http://www.sonarnerd.net/linux/libjackmm-071104.tar.gz -- Jussi Laako <jussi.laako(a)pp.inet.fi>

21 years, 2 months

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