Linux-audio-dev

linux-audio-dev@lists.linuxaudio.org

3 participants
7520 discussions

by Anthony

http://www.vischeck.com/vischeck The above link allows you to upload an image or parse a webpage thru some software written at stanford that imitates what a colour blind person would see. It may be worth the time for you GUI designers to run a screenshot in it and see what 1/10 people see. Case in point: In RTsynth it is impossible for me to tell whether a given synth is on or off. That pixmap LED seems like a good idea, but maybe blue would be better ;) Not that I'm picking on RTsynth. Web page designers may want to also look at this, although the linux webpage community usually does a good job. --ant

23 years

Re: [linux-audio-dev] Plugin APIs (again)

by John Lazzaro

> David Olofson <david(a)olofson.net> writes: > > Yes - but we're not talking about MIDI here. We *may* require that > events are never lost, and even that it's not legal to send two > identical events in line to an event port, unless you really mean > something else than to set a controller to the same value twice. Think ahead about how these sorts of requirements will be enforced: will they be a "law of nature" (code checks to see if an app broke the law, and takes action, like nature takes action when you try to change the current flowing through an inductor :-), or will it be unchecked by code? If its the latter, you can get into this mode where everyone has extra checking and work-around code, to handle impolite API users who aren't obeying the requirements. ------------------------------------------------------------------------- John Lazzaro -- Research Specialist -- CS Division -- EECS -- UC Berkeley lazzaro [at] cs [dot] berkeley [dot] edu www.cs.berkeley.edu/~lazzaro -------------------------------------------------------------------------

23 years

Re: [linux-audio-dev] Plugin APIs (again)

by John Lazzaro

> David Olofson writes: > > The point I think you're missing is that a "control change" event is > *exactly* the same thing as a "voice start" event on the bits and > bytes level. Lossy MIDI filters will prune away two MIDI Control Change commands in a row for the same controller value with the same data value, apart from controller numbers (like All Notes Off) whose semantics have meaning in this case. And the assumption underlying the behavior of these filters are present in subtle ways in other MIDI gear and usages too. For example, a programming language that presents an array with 128 members, holding the last-received (or default) value of each MIDI controller, presents an API that implicitly does this filtering, no matter how frequently the program samples the array. ------------------------------------------------------------------------- John Lazzaro -- Research Specialist -- CS Division -- EECS -- UC Berkeley lazzaro [at] cs [dot] berkeley [dot] edu www.cs.berkeley.edu/~lazzaro -------------------------------------------------------------------------

23 years

[linux-audio-dev] The global API namespace

by David Olofson

Just wondering how the h*ll you're supposed to name functions and types when all sensible naming conventions seem to be reserved by POSIX and other authorities... How about this for Audiality: Functions: a_whatever() Types: at_whatever I bet *some* lib is using a_* and/or at_*, but I have yet to find it. Besides, it doesn't look like a great idea to use both a_* and at_* for a single project - but *_t is reserved, and I don't like Capitalization in public APIs. Maybe I can make an exception, though... A_* and AT_* or something? Then again, most compilers can tell types from functions without throwing too much bogus messages at the user, so one might get away with a single prefix and simply remove the _t everywhere. //David Olofson - Programmer, Composer, Open Source Advocate .- The Return of Audiality! --------------------------------. | Free/Open Source Audio Engine for use in Games or Studio. | | RT and off-line synth. Scripting. Sample accurate timing. | `---------------------------> http://olofson.net/audiality -' .- M A I A -------------------------------------------------. | The Multimedia Application Integration Architecture | `----------------------------> http://www.linuxdj.com/maia -' --- http://olofson.net --- http://www.reologica.se ---

23 years

Re: [linux-audio-dev] Re: [Jackit-devel] 2.4.20-rc1�� + lowlat +preempt + alsa + jack = dead computer

by delire

audality looks good. we are currently using fmod <http://fmod.org> for a large games based arts project that sadly had to be win32 due to the nature of out middleware sponsorship <http://selectparks.net/acmipark.htm> currently i am using the <http://nevrax.org> NeL engine and hope to integrate fmod. i am however interested as to whether or not audality will at some point support www streaming. also, i've just ordered linux for ps2 dev kit.. looks like fun ;) julian oliver http://www.selectparks.net > On Saturday 07 December 2002 03.58, Fernando Pablo Lopez-Lezcano > wrote: > > > Where are the lowlat and preempt patches for 2.4.20? > > > > Not on the net at this point. I have been hand tweaking the > > originals to patch cleanly (trying to fix the failing chunks). I > > can email them to you, use at your own risk :-) > > I would be interested in trying your version of the patches. Please > mail! :-) > > > BTW, I applied the 2.4.19 LL patch to 2.4.20, and got a few rejects > in the file system area, which I have not investigated further. > (Seems to be a lot of changes around there...) Performance is "ok" > under X and proc stress, but I get countless latencies in the whole > range up to some 6-8 ms as soon as I start stressing the disk. (This > is *with* DMA enabled, of course.) > > Haven't tried preempt yet. > > > As to freezing, I've only managed to do that once - and IIRC, that > was when trying to instantiate a synth in MusE while Ardour was > running in the background. No useful info about what actually > happened, and I haven't tested that combination any further. > > Are you certain your freeze is actually happening in kernel space? > Tried using watchdog with "ping-pong" between highest and lowest > priority SCHED_FIFO threads? (BTW, we should have a watchdog anyway, > probably integrated with givertcap or something.) > > > //David Olofson - Programmer, Composer, Open Source Advocate > > .- The Return of Audiality! --------------------------------. > | Free/Open Source Audio Engine for use in Games or Studio. | > | RT and off-line synth. Scripting. Sample accurate timing. | > `---------------------------> http://olofson.net/audiality -' > .- M A I A -------------------------------------------------. > | The Multimedia Application Integration Architecture | > `----------------------------> http://www.linuxdj.com/maia -' > --- http://olofson.net --- http://www.reologica.se --- > > --

23 years

[linux-audio-dev] lrdf version 0.1.2

by Steve Harris

http://plugin.org.uk/lrdf/ Applied patches from Richard Bown, making it c++ friendly and fixing some const-isms. liblrdf is a library for handling RDF (http://www.w3.org/RDF/) descriptions of LADSPA (and potentially other format) plugins. It allows grouping of plugins into trees for user slection and finer description of plugins and ports than the .so format allows (for example to indicatate textual equivalents of integer port values). It also provides named and described defaults and presets, metadata and general semnatic goodness. examples/example.rdf contains a slighly out of date description of my plugins. There are some example programs that show how the API works. - Steve

23 years

[linux-audio-dev] ANN: swh-plugins 0.3.3

by Steve Harris

http://plugin.org.uk/releases/0.3.3/ Me again :) Sorry to release again so soon, but quite a few people have asked me for the improved Bode shifter, and everyones always after more pitch shifting options so I decided to release again. I've added a more sophisticated Bode shifter and made quality, speed and channel separation improvements to the old one. The outputs may even be labelled correctly now ;) I've also added an AM pitch shifter, which is pretty fast and for certain source material it actually gives reasonable sounding results, much to my supprise. Pitch shifter: http://plugin.org.uk/ladspa-swh/docs/ladspa-swh.html#id1433 Frequency shifter: http://plugin.org.uk/ladspa-swh/docs/ladspa-swh.html#id1431 Enjoy, Steve

23 years

[linux-audio-dev] New relase of ZynAddSubFX (1.0.1)

by Nasca Paul

Hi. Today I relased a new version of ZynAddSubFX. News: - corrected a bug that made ZynAddSubFX to crash(sometimes) if you disable a part - wrote Resonance (This produces natural sounds, listen demo07.ogg from homepage) - added the BandPass filter - added the recording feature (as raw files) - added "New instrument" menuitem ZynAddSubFX is a free (GPL v.2) software synthesizer. The homepage is: http://zynaddsubfx.sourceforge.net/ You can download it from: http://sourceforge.net/projects/zynaddsubfx Hope you like it. Paul. __________________________________________________ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.com

23 years

[linux-audio-dev] Echo Darla/Gina/Layla/... on Linux

by David Olofson

I have a short, simple question: Would anyone around here care for ALSA drivers for the Echo (formerly Event/Echo) line of studio audio interfaces? (We're talking about the original Darla/Gina/Layla, as well as the new 24 bit interfaces.) I have an old 20 bit Layla. I have their C++ driver source, which has been released under some BSD/MIT style licence. I have kernel hacking experience. I still have some hard feelings, I think... Hack or ditch? //David Olofson - Programmer, Composer, Open Source Advocate .- Coming soon from VaporWare Inc...------------------------. | The Return of Audiality! Real, working software. Really! | | Real time and off-line synthesis, scripting, MIDI, LGPL...| `-----------------------------------> (Public Release RSN) -' .- M A I A -------------------------------------------------. | The Multimedia Application Integration Architecture | `----------------------------> http://www.linuxdj.com/maia -' --- http://olofson.net --- http://www.reologica.se ---

23 years

[linux-audio-dev] LAD Meeting at ZKM, Karlsruhe/Germany 14.-16. March 2003

by Dr. Matthias Nagorni

This summer some of us met at the LAD booth at Linuxtag in Karlsruhe, Germany. Since the participants of this meeting enjoyed it very much, we discussed about meeting again in spring 2003. Frank Neumann and I had the idea of asking the "Zentrum fuer Kunst und Medientechnologie", Karlsruhe/Germany (Center for Art and Media, http://www.zkm.de) whether they would be interested in hosting such a meeting. The answer was positive and so we can invite to a LAD meeting at the Institut fuer Musik und Akustik (Institute for Music and Acoustics) at ZKM. The meeting will take place from Friday, 14. March 2003 to Sunday, 16. March 2003. We intend to have public sessions where we can present Linux audio applications and give talks and non-public sessions where we can discuss future audio development. For further planning the meeting we need a registration for talks/presentations at the public sessions, including an abstract and, if necessary, images/screenshots. To estimate the required room, we also need a registration for the non-public sessions. Please register talks/presentations until 8. January 2003 (please earlier, if possible), so that they can be announced in the printed programme of ZKM. Please register for the non-public sessions until 3. March 2003. Registrations can be sent to either Frank Neumann or me. Please use the keywords "ZKM registration" in the subject. We will post the list of talks/presentations and further information on the meeting from time to time, so that you can decide about joining this meeting. Matthias -- Dr. Matthias Nagorni SuSE GmbH Deutschherrnstr. 15-19 phone: +49 911 74053375 D - 90429 Nuernberg fax : +49 911 74053483

23 years

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Linux-audio-dev