Linux-audio-dev

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2 participants
7534 discussions

[linux-audio-dev] best option for audiovisual synchrony

by Simon Barthelmé

Hi all, We're in the process of porting an open source Matlab toolbox to Linux called the Psychtoolbox. It's a piece of software that's widely used within neuroscience and psychophysics, to display graphics and play sounds in experiments. It uses OpenGl for its graphics backend, and right now the sound support is just matlab's, which is really poor. A lot of us researchers are interested in audiovisual experiments, where we study how the brain combines auditory and visual information (for example in speech perception). Concretely speaking, that means we need to get as precise a timing and synchrony as we can possibly get. A typical experiment will go something like this : - display a flash and, at the same time, play a beep - wait for response The tricky bit is of course getting a flash that's totally synchronous with the beep. Absolute synchrony is not achievable without dedicated hardware, but we need to get an approximation that's within the few ms range. From what I've read it seems that Linux is a pretty good platform for that, since it has low latency/real time support. What I need to know is how I should go about implementing some kind of FlashAndBeep function, that guarantees that the sound starts playing as soon as the display buffer is flipped, with the shortest predictable delay possible. Is ALSA the way to go ? JACK maybe ? Anything else ? I'd love to read about any piece of advice you might have. Do ask me if you need more details. Thanks a lot, Simon Barthelmé PhD Student Laboratoire de Psychologie de la Perception CNRS/Université Paris V lpp.psycho.univ-paris5.fr

19 years, 3 months

[linux-audio-dev] jack_mixer - frist release

by Nedko Arnaudov

jack_mixer is GTK (2.x) JACK audio mixer with look similar to it`s hardware counterparts. It has lot of useful features, apart from being able to mix multiple JACK audio streams. Homepage with screenshots: http://home.gna.org/jackmixer/ Download: http://download.gna.org/jackmixer/ -- Nedko Arnaudov <GnuPG KeyID: DE1716B0>

19 years, 3 months

[linux-audio-dev] Paper on dynamic range compression

by Andres Cabrera

Hi all, I've written a paper analyzing the characteristics of some software dynamic range compressors. The interesting part concerning linux, is that all my results show jaggedness on the gain reduction curves. I did the tests using Ardour, Audacity and Rezound with the same results, which points to something strange in some part of the process. If you're interested, have a look a the paper, and let me know what you think. http://www.geminiflux.com/Stuff/Cabrera-Compression.pdf Cheers, Andrés

19 years, 3 months

[linux-audio-dev] unsubcribe

by Yosvany Llerena Rodríguez

19 years, 3 months

[linux-audio-dev] [ANN] Simple Sysexxer 0.1.1

by Christoph Eckert

Hi all, first my apologies for cross-posting (TM) :) . This is a wee small bugfix release of Simple Sysexxer. It now should build without needing Qt debug libs installed. As I didn't get any feedback since the first release (neither success stories nor complaints), I'd like to encourage anyone to send feedback or bug reports. Simple Sysexxer is a tool to exchange sysex data with MIDI devices, e.g. to do backups of the device's memory contents or to send presets loaded from the web. Advantages: * (Hopefully) easy to use graphical user interface * True ALSA sequencer support * Built using Qt, no KDE dependency at all * Minor changes to the source should make it run on Mac OS X or even Windows Disadvantages: * Requires Qt4 and will *not* build against Qt3 * No JACK MIDI support :) * No OSS support * No prebuilt binaries available Information and source download: http://www.christeck.de Enjoy, ce

19 years, 3 months

[linux-audio-dev] hearnet improvement

by Dmitry Baikov

Hi! First of all, thanks for a great program! I made two patches for it: 1) make hearnet suid and drop privileges right after libpcap initialization. I had to move libpcap init code above jack So, you can use hearnet as regular user. 2) Mutex in jack_process is a very bad thing. Moreover, it seems there's no need for it, as voice->active field serves as a mutex. Attached patch removes pthread_mutex. If you think voice->active assumption is a weak one, the problem can be solved with a pair of jack_ringbuffers: one for free voices and one for active. Regards, Dmitry.

19 years, 3 months

[linux-audio-dev] Linux Audio Conference #5 (LAC2007): Call for Papers, Music, etc

by Simon Schampijer

Dear all, we are happy to announce the call for papers for the 5th Linux Audio Developers Conference (LAC2007). The conference is organized by the TU-Berlin in cooperation with people of the Linux Audio Developers mailing list, the music festival Inventionen 2007 and the Humboldt University of Berlin. The LAC2007 is taking place at the TU-Berlin, Germany from the 22nd - 25th of March 2007. We have introduced some new tracks. Besides the category for papers, demos and workshops, calls for tutorials and hands on demos have been added. The tutorials aim is to give new (potential) users an overview of the possibilities of Linux Audio Software and how to get started. The LAC2007 provides a computer pool (LA Pool) where developers can give an introduction to their software and where participants can try out Linux Audio Software during the conference. This has been combined in the call hands on demos. Since the TU-Berlin is installing a new Wave Field Synthesis (WFS) system the call for music has been extended by a call for compositions for this system. Music that can be used for radio airplay can be submitted, and will after acceptance by the Campusradio of the TU Berlin, be played during the conference. More detailed Information can be found in the 'Call for Papers' attached to this email or on the website at: http://www.kgw.tu-berlin.de/~lac2007/ We are looking forward to many interesting submissions for the Linux Audio Conference 2007 and hope to see you in Berlin in 2007! Please feel free to forward this email to anybody who is interested. On behalf of the LAC2007 organisation team, Simon Schampijer and Marije Baalman Call for the Linux Audio Conference 2007 - 22nd - 25th of March 2007 taking place at the Technische Universität Berlin in cooperation with Inventionen 2007 and the Humboldt University of Berlin This call includes: Call for Papers Call for Demos Call for Hands On Demos Call for Workshops Call for Tutorials Call for Music (categories: Concert, Club, Radio and Wave Field Synthesis) ----------------------------- Call for Papers We invite submissions of papers addressing all areas of audio processing based on Linux and open source software. Papers can focus on technical, artistic or scientific issues and can target developers or users. This includes (but is not limited to) the following categories: Computer Music Music Production Instruments Drivers and Sound Architecture Audio Distributions Generic (Usage, Documentation etc.) The conference is held in English. Length of a paper is 4-8 pages. Papers have to include an abstract (50-100 words). The abstract will be published separately on the conference website once the paper has been accepted. Also, papers should include up to 5 keywords. In general talks should take 20-30 minutes followed by 5 minutes discussion. Please notify us if you need a special technical setup. The technical standard setup will be: microphone (head set) projector with XVGA input (resolution 1024x768) stereo speaker setup with mini jack input a PC with a pdf viewer How to submit File format is PDF, formatted for A4 paper. Make use of the templates for paper formatting available at: http://www.kgw.tu-berlin.de/~lac2007/download/templates-lac2007.tar.gz See our check list to ensure that you do not forget to enclose all necessary information. Send your paper and all necessary information by 8 Jan 2007 via email to this address: lac2007 AT robin.kgw.tu-berlin.de You will be notified by 05 Feb 2007 whether your paper has been accepted. The reviewers may ask you to modify your paper in order to be accepted. The deadline for the final version is March 1, 2007. Important Dates 08 Jan 2007: Paper submission deadline 05 Feb 2007: Notification of acceptance 01 Mar 2007: Final version deadline 22 - 25 March 2007: Conference ----------------------------- Call for Demos You do not need to write a whole paper, but rather a short abstract only (50-100 words). This category is mainly thought for software demos. Be aware though that in case of too many submissions papers take priority over demos... See section "Call for Papers" for info on the duration of talks and the technical setup. ----------------------------- Call for Hands On Demos A new item of the LAC 2007 is LA Pool: a pool with Linux audio computers, on which programs can be demonstrated. To give a "hands on" demo you can reserve LA Pool for 1 hour, of which ca. 20 minutes can be used as a general introduction and the rest should be free for participants to try out the program and ask questions. A Hands On demo can be held in addition to a Paper Presentation or as the presentation for the Demo, so you need to either submit a paper or an abstract as mentioned above. Additionally, you need to give us a version of your software, with clear installation instructions and requirements, so that we can install the software on the Pool before the conference. How to submit See our check list to ensure that you do not forget to enclose all necessary information. Send your abstract and all necessary information by 8 Jan 2007 via email to this address: lac2007 AT robin.kgw.tu-berlin.de Deadline for submissions is 08 Jan 2007. You will be notified by 05 Feb 2007 whether your submission has been accepted. ----------------------------- Call for Workshops With respect to their content workshops do not differ from talks: Workshops can have technical focus as well as artistic or scientific focus. Workshops can be targeted to developers as well as users. See section "Call for Papers" for more info on this. The shape of the workshop is completely up to you. E.g. it can be tutorial-like ("how to write an ALSA driver/ a jack application/ a LADSPA plugin/ etc.") or it can be BOFS-like (e.g. a meeting of like-minded users and/or developers to exchange experience and knowledge about a specific topic), or it can be anything in between. Workshops can take place in seminar rooms or in a public space like the TU Lichthof. Depending on the location, attendance might be limited to ca 10 people. We strongly encourage you to submit early. It will be more likely to get a free slot and it will be easier for attendants to know about the workshop if it is published on the conference website. If you expect the attendants to prepare their laptops for your workshop (e.g. by installing some software) or if there are other requirements, please note so in your abstract. How to submit: See our check list to ensure that you do not forget to enclose all necessary information. Send an abstract (ca. 50-100 words) and all necessary information via email to this address: lac2007 AT robin.kgw.tu-berlin.de The abstract will be published on the conference website once the workshop has been accepted (not before 01 March 2007 though). Submission deadline is 05 Feb 2007. You will be notified by 01 March 2007 whether your submission has been accepted. ----------------------------- Call for Tutorials New in this edition of the Linux Audio Conference will be a Tutorial track for new users. This Tutorial track will be hosted by the Media Science Department of the Humboldt University of Berlin. Proposals for additions to this Tutorial program are welcome. The aim of this Tutorial track is to give new (potential) users an overview of the possibilities of Linux Audio Software and how to get started. The difference to workshops is that the tutorials are given in a lecture environment and should focus on how to make music with Linux, more than going into specifics of certain programs. The tutorial track is supported by the LA Pool facility as attendants can try out the software themselves with hands on support. Send a short description of your proposed Tutorial topic (ca. 50-100 words), via email to this address: lac2007 AT robin.kgw.tu-berlin.de Submission deadline is 08 Jan 2007. You will be notified by 05 Feb 2007 whether your submission has been accepted. Criteria will be based upon creating a full fledged Tutorial program for Linux Audio. ----------------------------- Call for Music The conference will include several concerts. We are looking for music that has been produced completely or mostly under Linux and/or with open source software: Serious compositions, Electronica, Chill-Out, Ambient etc. Indicate whether you want to have your piece played in a concert like environment or a club like environment. Additionally you can submit Radio music (see below) and Wave Field Synthesis music (see also below). Additionally you are welcome to give a talk about your piece. We encourage you especially to show how you made the piece using open source software. Please send a short abstract (ca. 50-100 words) if you want to give a talk. If you want to participate, send your composition(s) to this address: LAC2007 - Call for Music Institute of Communications Research Sekretariat EN 8 Einsteinufer 17 D-10587 Berlin Germany Make use of one of the following media formats: Media: Audio-CD, DVD, DVD-R or CD-R File formats: aiff or wav Channels: mono, stereo, multi-channel and multi-mono (8 channels is no problem, more than 8 must be discussed). Samplerate: 44.1 or 48 kHz Resolution: 16 or 24 bit Include the following items with your submission (in English): A filled-out and signed printout of the form available here: http://www.kgw.tu-berlin.de/~lac2007/download/musicagreement.pdf For the printed program and to be published online and on the conference CD, in continuous text (no table or list please): A short commentary on the composition(s) (each ca. 150 words) A short Curriculum Vitae (ca. 100 words) Deadline for submissions is 08 Jan 2007. A jury will select the compositions that will be performed/played. Furthermore, the jury will give out three prices to participants to contribute to their travel expenses. Besides artistic criteria and technical reasons, these criteria apply for the selection: Tape pieces or pieces which are performed by the composers themselves will generally have more chances to get included. If we get more pieces than we can include in the program, composers who are attending the conference are preferred. Terms and conditions for participation can be found in the form mentioned above. This form includes among other things: I will receive no fees whether my composition is played or not. GEMA fees (in case of performance) will be paid by the organizer. The material I send to the TU Berlin will not be returned. Additionally to this Call for Music, during the late night concerts there will be an open stage: "Plug & Chill - The Linux Jam Nights" where attendants of the conference are invited to perform their pieces in a more club-like context. There is no deadline for this, so people can decide during the conference if they want to participate. However if you already know that you want to participate do not hesitate to inform us. Send us an email to lac2007 AT robin.kgw.tu-berlin.de and include a description of your equipment and a short characterization of your music (keywords only). During the conference it is possible to register at the info desk. Note that there is a time limit for "Plug & Chill". If we have received too many registrations already you might not get a slot. Contributions to "Plug & Chill" should not exceed 10 min. There will be a room at the TU Berlin where people can meet during the conference and rehearse for "Plug & Chill". ----------------------------- Radio Music A new category in the Music call is the call for music that can be used for radio airplay. In cooperation with the Campusradio (http://www.campusradio-online.de) of the TU Berlin, who will do a live report on the conference, we invite composers, musicians and producers of Music made or recorded and mastered with Open Source tools, to submit their works. If you want to participate, send an email to: lac2007-radio AT robin.kgw.tu-berlin.de with a link to your audio files. Alternately, send your music to the address above, with the addition: LAC2007 - Call for Music Radio Make use of one of the following media formats: Media: Audio-CD, DVD, DVD-R or CD-R File formats: aiff or wav or ogg Channels: mono or stereo Samplerate: 44.1 or 48 kHz Resolution: 16 or 24 bit Include the following items with your submission (in English): A filled-out and signed printout of the form available here (sent by mail, or by fax to: +49 30 31421143): http://www.kgw.tu-berlin.de/~lac2007/download/musicagreement.pdf Deadline for submissions is 05 Feb 2007. The choice of which pieces are played is in the hands of the Campusradio crew. A program listing will be on their website http://www.campusradio-online.de shortly before the conference. ----------------------------- Wave Field Synthesis Music Shortly before the conference, a new Wave Field Synthesis (WFS) system will be installed in one of the lecture halls of the TU Berlin. We are looking for composers who are interested in creating a composition for this system or who have already written pieces for WFS, which could be played on the system. The WFS system will be based on the sWONDER software (http://swonder.sourceforge.net), and can be controlled by OSC. For more information, please contact us at lac2007 AT robin.kgw.tu-berlin.de As there is no standard format for WFS material yet, we ask for a elaborate description of the piece and some examples of previous works. To prepare the piece for performance, it will be necessary for the composer to be present a few days before the conference. We will support efforts to get funding for this from external organizations (such as DAAD). Send your material to this address: LAC2007 - Call for WFS Music Institute of Communications Research Sekretariat EN 8 Einsteinufer 17 D-10587 Berlin Germany Make use of one of the following media formats: Media: Audio-CD, DVD, DVD-R or CD-R File formats: aiff or wav Channels: mono, stereo, multi-channel and multi-mono (8 channels is no problem, more than 8 must be discussed). Samplerate: 44.1 or 48 kHz Resolution: 16 or 24 bit Include the following items with your submission (in English): A filled-out and signed printout of the form available on: http://www.kgw.tu-berlin.de/~lac2007/download/musicagreement.pdf For the printed program and to be published online and on the conference CD, in continuous text (no table or list please): A short commentary on the composition(s) (each ca. 150 words) A short Curriculum Vitae (ca. 100 words) Deadline for submissions is 08 Jan 2007. Terms and conditions for participation can be found in the form mentioned above. This form includes among other things: I will receive no fees whether my composition is played or not. GEMA fees (in case of performance) will be paid by the organizer. The material I send to the TU Berlin will not be returned.

19 years, 3 months

[linux-audio-dev] ghostess patches

by Dmitry Baikov

Hi! Sean, thanks a lot for ghostess! Take a look at the patches if you have time. -execlp patch fixes things on 64-bit architectures: execlp() expects its arglist to end with NULL, not 0. And on 64-bit architectures they are different (0 is 32-bit int, and NULL is 64-bit pointer). -configure and -jackmidi patches are from gentoo proaudio overlay and are included for completeness. Regards, Dmitry.

19 years, 3 months

[linux-audio-dev] question about a c++ error

by Dave Phillips

Greetings: This is perhaps a bit OT (or more than a bit). I'm eager to work with a new macro for Open Office that inserts LilyPond-encoded music fragments into an OOo document, but I've hit an unusual snag. The macro is installed correctly, but when I try to use it I receive this error: terminate called after throwing an instance of 'std::logic_error' what():basic_string::_S_construct NULL not valid It almost looks poetic. :) Alas, Google wasn't much help, and the author of the macro has no idea why this error results (his code contains no C++). Can any C++ guru here shed any light on the how/what/why of the error ? Maybe even suggest a fix ? LilyPond 2.8.4, OOo 2.03, and I'll be happy to supply any other needed information. And yes, the error has been posted on the LP dev list. Best, dp

19 years, 3 months

Re: [linux-audio-dev] question about a c++ error

by Taybin Rutkin

Just a guess, but it looks like at some point it is trying to create a NULL string, which isn't allowed (apparently). I'm not sure if this is helpful or obvious to you. Taybin -----Original Message----- >From: Dave Phillips <dlphillips(a)woh.rr.com> >Sent: Oct 11, 2006 6:05 PM >To: LAD Mail List <linux-audio-dev(a)music.columbia.edu> >Subject: [linux-audio-dev] question about a c++ error > >Greetings: > >This is perhaps a bit OT (or more than a bit). I'm eager to work with a >new macro for Open Office that inserts LilyPond-encoded music fragments >into an OOo document, but I've hit an unusual snag. The macro is >installed correctly, but when I try to use it I receive this error: > >terminate called after throwing an instance of >'std::logic_error' >what():basic_string::_S_construct > NULL not valid > >It almost looks poetic. :) > >Alas, Google wasn't much help, and the author of the macro has no idea >why this error results (his code contains no C++). Can any C++ guru here >shed any light on the how/what/why of the error ? Maybe even suggest a >fix ? > >LilyPond 2.8.4, OOo 2.03, and I'll be happy to supply any other needed >information. > >And yes, the error has been posted on the LP dev list. > >Best, > >dp >

19 years, 3 months

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Linux-audio-dev