Linux-audio-dev

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7516 discussions

[linux-audio-dev] IEC 60608 or IEC 61672 Leq(A) measurement

by Andres Cabrera

Hi all, I'm building a measuring system (naturally will be GPL'd, and initially linux only) aimed at audio post, and it would be great (and the main purpose) to include Leq(A) measurements, which are defined in IEC 60608 or the newer IEC 61672. Does anyone have access to this information or does anyone know this standard? Thanks, Andrés

18 years, 10 months

Re: [linux-audio-dev] Grabbing sound using Roland Edirol FA-101

by Jonathan Woithe

Helge Fredriksen wrote: > > Did any of you guys ever tried to use the OpenAL API interface towards a > Firewire sound device like FA-101? I see that it appears on your lists as a > device that has drivers on Linux. AFAIK OpenAL doesn't talk to hardware directly - it provides an API for programs to use but sends data to the soundcard via the operating system's native sound system. Therefore the devices supported by OpenAL are the devices supported by the underlying operating system. For many sound cards under Linux, that native sound system is ALSA (http://www.alsa-project.org). OSS was the previous default native sound system under Linux and is still in use by numerous programs. The FA-101 is (as you'd know) a firewire interface. Support for firewire interfaces is starting to gain momentum now but for various technical reasons this is not provided by ALSA at this time. The support effort is the so-called Freebob project (http://freebob.sourceforge.net) in combination with the JACK system (http://www.jackaudio.org/), a low-latency audio API. Only a small number of firewire audio interfaces are supported by freebob at this time, but from what I read the FA-101 is one of them. Getting back to your question, if OpenAL supports JACK under Linux then in theory you could talk to an FA-101 via OpenAL. According to the OpenAL website it currently only supports OSS and ALSA under Linux. Therefore at this point in time you can't use OpenAL to send audio to an FA-1-1. However, unless you particularly wanted the 3D modelling features of OpenAL you'd probably be better off using the JACK API directly. It should be noted that a long-term goal of the freebob project is to implement an ALSA driver for the firewire interfaces. However, there is still much to do before that will occur so I can't see it appearing any time soon. Once it did appear (and assuming OpenAL don't implement an interface to JACK earlier) you would be able to use OpenAL with the FA-101. Regards jonathan

18 years, 10 months

[linux-audio-dev] OT: interesting angle on the NOVL-MSFT deal

by Ivica Ico Bukvic

http://weblog.infoworld.com/enterprisemac/archives/2006/12/leopard_server.ht ml Ico

18 years, 10 months

[linux-audio-dev] CLAM 0.95 released

by Pau Arumi

After several months without a stable release but lots of development activity, we are pleased to announce CLAM 0.95 CLAM (http://clam.iua.upf.edu) is a C++ framework for doing research and app development in audio and music. It comes with a set of applications ready-to-use. Most important in this release is NetworkEditor 0.4, with a radically reworked UI based on Qt4.2, lots of work on stability and usability, and new visual-prototyping features. You can visually prototype standalone apps (or audio plugins): Edit audio networks with NetworkEditor, then edit its UI using Qt Designer and CLAM widgets plugins. Finally, Prototyper let you run the audio network with its UI. This is better shown in this quick tutorial: http://iua-share.upf.es/wikis/clam/index.php/Network_Editor_tutorial This release comes with many new processings, mostly spectral transformations. But we want to highlight the tonal-analysis which does chords identification at real-time, and its related visualizations. This code is based on the work done by researchers at Queen Mary University (London) and Universitat Pompeu Fabra (Barcelona). More credits are in the About box. These and many other improvements can be found in the ChangeLog: http://clam.iua.upf.edu/ChangeLog.txt This release brings new packages for Linux (Debian sid, Ubuntu edgy) and Windows installers. In Linux, you can simply add new sources to /etc/apt/sources.list deb http://clam.iua.upf.edu/download/linux-debian-sid ./ deb http://clam.iua.upf.edu/download/linux-ubuntu-edgly ./ Both Linux and Windows comes with desktop integration and several examples ready to use. Mac OSX packages will be catching up next weeks. Bug reports and any feedback is very welcomed (and needed). The CLAM team -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.

18 years, 10 months

[linux-audio-dev] Hydrogen development ?

by Dave Phillips

Greetings: I've not checked out recent SVN sources, but watching the devel mail list I get the distinct impression that there's no internal development going on with Hydrogen. Almost all traffic on the list is concerned with translations. So, what's the story ? Is there a Hydrogen 1.0 in the works or is it a deader ? It would be a deep shame to see Hydrogen's development languish. Best, dp

18 years, 10 months

[linux-audio-dev] [ANN] yet another linux sound wiki.

by Robin Gareus

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I've started to convert the information from linux-sound.org into a distributable doku-wiki. http://linux-sound.sonologic.nl/ This is a prototype installation and experimental suggestion! Please review and comment before further development proceeds. ** content information ** it's basically a database of http://linux-sound.org chopped up into text files. I have added URLs to [external] screenshots and logos to some pages and updated or deleted a few dead links.. it's still a long way to go, but some tasks could be semi-automated (fi. searching for dead links..) I am open to suggestions on how to maintain the content. This prototype is open for editing to all registered users (email verification). I can share experiences or rewrite and improve the dokuwiki to some extend, and may contribute to content but not on a day to day basis. patches, suggestions and comments are welcome. ** design/layout look&feel ** no efforts have been taken to change the default dokuwiki look and feel. Is anyone interested in a) designing and writing a dokuwiki template b) start a discussion on aims and goals for good user interaction design c) create a wiki-page to host a design contest d) rewriting the dokuwiki template ;-) ** technical- and mirror information. ** The data set is a 20MB git repository. dokuwiki keeps it's data in txt files. I've started to put them under git version control. The idea for mirror-sites is to check out and branch their wiki while maintainers can merge information upstream. dokuwiki only requires php. The wiki itself is available as a separate git repository (incl. pre-installed plugins and config) - the independent data-set git repos should work with every dokuwiki installation. The whole system including generated-meta data is about 50 MB. more information: http://linux-sound.sonologic.nl/devel:git http://linux-sound.sonologic.nl/devel:setup #robin -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (GNU/Linux) iD8DBQFFfI+seVUk8U+VK0IRAgrzAKDEF5aI9h8yZOis11v+T+GRTugL3wCfVc/z N/dkTVHWwZMWz9ca8iVnDcY= =z/Nj -----END PGP SIGNATURE-----

18 years, 10 months

[linux-audio-dev] rebuilding the linux soundapps site

by Dave Phillips

Greetings: I've received a few notes that indicate people are interested in revising the look & feel of the site at linux-sound.org. If you're currently working on such a project *please* make your intentions public. There are at least two projects working towards the same end, and this is truly one wheel that does not need reinvention. Better that folks work together on it. Best, dp

18 years, 11 months

[linux-audio-dev] Audio sampling and fft accuracy.

by James Courtier-Dutton

Hi, If I have a sample 2kHz sine wave signal at 50% peak. I then add a white noise signal at 20%. I then do a FFT transform. If I design the FFT so that 2kHz is at the center of one of the FFT buckets, how close will the FFT figure be to the 50% sine wave input. Obviously, there will be a variation due to the amount of noise. So the output of the FFT buckets will be 50+-error. Will this variation as a result of noise decrease as I use more and more samples per fft block? I.e.Will the +-error value decrease? I would think it should decrease, as a result of the general averaging the fft routine will make to the noise signal. I would think that as the noise was random, it should average out to zero over time. I.e. 20% noise samples. Average each sample, the average should be zero as one reaches infinity number of samples. So, if my reasoning above is correct. I can draw the following conclusion: A 2kHz signal sampled at 8kHz and then FFTed, the 2kHz bucket will be less accurate than a 2kHz signal sampled at 16kHz and then FFTed. Now, I just need to work out how much more accurate it would be. James

18 years, 11 months

[linux-audio-dev] MIDI bank select MSB + LSB

by Christian Schoenebeck

Hi everybody! I wonder what's the common behavior for a synth/sampler regarding MIDI bank select messages. You might know that MIDI has splitted bank indeces into two values MSB (coarse) and LSB (fine) value. So the "optimal" behavior would be a device / sequencer to send a MSB and a LSB bank select message to change the current bank. But many older keyboards for example won't do that. I've heard most of them only send MSB bank selects, while few others send only LSB bank selects. Is that true? If yes, how should you handle that on synth/sampler side? Because you know, using just MSB messages would only allow to switch between the following set of banks: { 0, 128, 256, ... , 16256 } while using just LSB messages would only allow to switch between the following set of banks: { 0, 1, 2, ... , 127 } So should a synth stick with that behavior or should it detect if a device either only sends MSB bank selects or only sends LSB bank selects and then actually remap MSB-only selects to a set of: { 0, 1, 2, ... , 127 } CU Christian

18 years, 11 months

[linux-audio-dev] Open source development sites?

by Juhana Sadeharju

Hello. What other sites than SourceForge hosts open source projects? Audio and graphics projects. I'm attempting to build some kind of developer's meta catalog of all open source projects. Also, do people need yet another site for open source development? Juhana -- http://music.columbia.edu/mailman/listinfo/linux-graphics-dev for developers of open source graphics software

18 years, 11 months

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Linux-audio-dev