Linux-audio-dev April 2004

linux-audio-dev@lists.linuxaudio.org

99 participants
90 discussions

[linux-audio-dev] RE: [linux-audio-user] snd-hdsp+cardbus+M6807 notebook=distortion -- FIXED!

by Ivica Ico Bukvic

> On Sunday 18 April 2004 13:44, Tim Blechmann wrote: > > out, the windows hdsp driver sets the latency timer of > > the cardbus bridge and (i am repeating what i wrote before) thomas added > > this to the linux driver as well ... which didn't work for no kernel i > > no. there was a change setting the lateny timer to 255, but only for the > HDSP, not for the bridge. that's why i ask. > I see. Not sure about that. What I do know, however, is that the hexdump I was looking into was the cardbus registers, *not* the hdsp ones (see below). > > used on my machine (nearly every kernel between 2.4.22 and 2.6.5 both > > vanilla and ck/gentoo) > > there is a latency problem, but it's NOT related to the settings of the > > latency registers of the hdsp or the cardbus bridge... > > > > > ico, i'm know it works for you with 0x04 at 0xc9, but please try > > > anyway. > > as i pointed out earlier, i've got the same behaviour on my machine with > > the same register settings on windows (works fine) and on linux (doesn't > > work). > > what we should do is figuring out, what this specific register on ico's > > machine is actually doing... > > could you actually show us the hexdump of the config space? > This is all I have currently. Will generate more as soon as I can (please let me know which particular device you are looking for). http://meowing.ccm.uc.edu/~ico/eMachines/ (jpegs are verbosely titled) Ico

20 years, 8 months

[linux-audio-dev] [ANN] Ecamegapedal 0.4.4 released

by Kai Vehmanen

1. A short summary of changes Minor bugs in JACK support have been fixed. Now Ecamegapedal makes sure it won't launch the JACK daemon by accident when probing for available devices on startup. The manual pages have been updated with some new sections. --- 2. What is Ecamegapedal? Ecamegapedal is a real-time effect processor software with a graphical user interface for controlling the effect parameters. It is meant to be used as a virtual guitar-fx or studio effect box. In addition to real-time operation, Ecamegapedal also supports reading from and writing to audio files. All audio object and effect plugin types provided by the Ecasound libraries are supported. This includes ALSA, JACK, OSS, aRts, over 20 file formats, over 30 effect types, LADSPA plugins and multi-operator effect presets. Ecamegapedal's implementation is based on Ecasound and Qt libraries. Ecamegapedal is licensed under the GPL. --- 3. Contributors Patches Kai Vehmanen (various) --- 4. Links and files http://www.eca.cx/ecamegapedal http://ecasound.seul.org/download/ecamegapedal-0.4.4.tar.gz --- http://www.eca.cx Audio software for Linux!

20 years, 8 months

[linux-audio-dev] ANNOUNCE: Q 5.3, Q-Midi 1.14, Q-Synth

by Dr.Graef＠t-online.de

Q 5.3 has been released, along with Q-Midi 1.14. (Mostly bugfixes this time.) Q is an equational programming language based on term rewriting. Q-Midi is an add-on module for the Q language which provides an interface to MidiShare, Grame's cross-platform MIDI library. If you want to try out programming computer music applications in a high-level functional programming language, then these might be for you. You can find more information about Q and Q-Midi at http://q-lang.sourceforge.net/. Also available now in CVS is a first snapshot of the upcoming Q-Synth package which provides interfaces to OSC and SuperCollider3. See http://sourceforge.net/cvs/?group_id=96881 for checkout instructions (the CVS module name is q-synth), and for a link which allows you to browse the CVS repository. Enjoy! Albert Graef -- Dr. Albert Gr"af Email: Dr.Graef(a)t-online.de, ag(a)muwiinfa.geschichte.uni-mainz.de WWW: http://www.musikwissenschaft.uni-mainz.de/~ag

20 years, 8 months

[linux-audio-dev] Re: Audio over Ethernet

by John Lazzaro

On Apr 14, 2004, Anders Torger wrote: > Thus, I think it is necessary to implement something operating on the > ethernet level to get best performance in terms of throughput and > latency. > > /Anders Torger If what you mean by "operating at the ethernet level" means "no Cobra-like hardware to help, but putting data directly into Etherframes w/o IP/RTP headers", then its unclear to me that working at the RTP/IP level is going to hurt you much. The simplest implementation would have RTP/IP header overhead, but there are nice header compression schemes that get rid of it: http://www.ietf.org/rfc/rfc2508.txt and its improved versions. By using RTP, you get a lot of protocol design you might otherwise need to do, within RTP (like RTP MIDI) and surrounding it (session management, etc). One big thing you need to worry about are clocks -- unlike a protocol like AES/EBU or SPIDF, packet-based media is not sending an implicit clock along with the data. So, the nominal "sender sampling rate" can't be precisely linked to the nominal "receiver sampling rate" in a simple way. The consequence is either too much data piles up at the receiver, or not enough. One solution to this problem is to continuously running a sample-rate converter at the receiver in software, to keep the two sampling rates locked. See: http://www1.ietf.org/mail-archive/working-groups/avt/current/ msg00569.html and use the "Thead Next" to cycle through the discussion, it goes on a ways and lots of interesting folks drop in with info. A separate issue for your "many streams" case is synchronizing the streams to each other, in the case where not all share the same nominal clock. RTP has tools for this, based on associating NTP timestamps from a common clock to each independent stream, that get used for audio/video lipsync, and can be repurposed here as well. --- John Lazzaro http://www.cs.berkeley.edu/~lazzaro lazzaro [at] cs [dot] berkeley [dot] edu ---

20 years, 8 months

[linux-audio-dev] minor update to Linux soundapps pages

by Dave Phillips

Greetings: Some URL errors fixed, Speech section completely updated (thanks to Antti Kaihola), LilyPond entry massively rewritten, and a few more apps in the New Additions... http://www.linuxsound.at (Europe) http://linuxsound.jp (Japan) http://linux-sound.org (US) Best, dp

20 years, 8 months

[linux-audio-dev] Re: wcnt-1.1z released!

by Kjetil Svalastog Matheussen

martijn: > the last? are you not gonna announce it any more, gonna change the name, or No, please don't change the name! Its a refreshingly amusing to read about a serious sound tool with such a totally unserious name. I like it. :) --

20 years, 8 months

[linux-audio-dev] wcnt-1.1z released!

by James W. Morris

Hello Everyone! Announcing for the last time this year the new release of Wav Composer Not Toilet. Wcnt is of course, the not-real-time modular synth, sequencer, sampler, wav file generator. Get it from wcnt.sourceforge.net. This release is wcnt-1.1z (read wcnt-1.1260) and here are the new features and changes: ~~~~~~~~~~~~~~~ BIG CHANGES: ~~~~~~~~~~~~~~~ *** Updated website to be more helpful + online example. *** Sets of data which are not module parameters or module inputs (shape of an adsr, notes in a riff, riffs in a sequencer, etc) have now been generalised into a base class. Specialised data reading routines have been replaced, which make it easier to program new data sets. This also means that data definitions are now more tappy tappy on your keyboard, my justification for this extra user effort is readability. *** Riffs inserted into sequencer can be transposed at point of insertion, and the note lengths can be modified. ~~~~~~~~~~~~~~~ COMMAND LINE: ~~~~~~~~~~~~~~~ *** Now has short options too. *** two conversion options to convert a note name to a frequency, and a frequency to degrees per sample and samples per cycle. ~~~~~~~~~~~~~~~ NEW MODULES: ~~~~~~~~~~~~~~~ *** dynamic Maps amplitudes of input signal to a set of output amplitudes/ratios. Of course it has two sets of which the output can be modulated between. *** spreader Spreads the output of a number of wcnt_signal modules along an imaginary line and outputs that which the modulation input lands upon. *** note_tran Translates notes into values. The note range used depends on being triggered by a note_on, or note_slide. Four output triggers so you can tell if the note was in one of the two note ranges or not. (see online example: wcnt.sourceforge.net/drumex01.wc ) ~~~~~~~~~~~~~~~ MINOR CHANGES: ~~~~~~~~~~~~~~~ *** adsr got a couple new params regarding shape modulation *** logic trigger's xor mode definately works now (dunno if it did before) *** trigger now behaves in a note_on/note_off type operation gleaned from the input signal. *** wcnt_signal has a level param That's All Folks, same time next year, see ya! see ya! see ya. see ya, see ya see yaseeyacyacyacycaaa... James. ~(sirromseventyfive)~ _________________________________________________________________ Use MSN Messenger to send music and pics to your friends http://www.msn.co.uk/messenger

20 years, 8 months

[linux-audio-dev] [ANN] Radium v0.63

by Kjetil Svalastog Matheussen

http://www.notam02.no/arkiv/src/radium-0.63.tar.bz2 http://www.notam02.no/radium/ (Note, the CVS is very outdated) Radium V0.63 Alpha Linux Port Released 15.4.2004 HOW TO MAKE IT RUN WITHOUT READING THE REST OF THE README FILE make ./start.sh INTRODUCTION This is the second public, and the first official, release of the linux port of the music editor Radium. The Amiga version has been stable since January 2002. Radium is a new type of graphical (currently only) notebased music editor. For more info about the program, check out the online manual placed at http://www.notam02.no/radium/ somewhere. COMPILE The following packages are currently used to build and run Radium: *libgc - http://www.hpl.hp.com/personal/Hans_Boehm/gc/ *Python - www.python.org (at least V2.0 and tkinter) *Python development package *pyqt - http://www.gnu.org/directory/devel/specific/PyQT.html *pygtk - http://www.daa.com.au/~james/software/pygtk/ (pygtk1, use pygtk-0.6.11) *xterm - Yupp. Most of these things are allready included in the radium/ directory (mainly because of compatibility problems between various versions of gtk, pygtk and libglade), so you only need to get hold of "pyqt". "pyqt" is available as package for most linux distributions. CURRENT STATE The biggest problem is that saving does not work. Loading does though. Other things that needs to be fixed is that the playing behaves strange when reaching the end of the blocks, and that the alsa-seq code needs some care (midi/alsaseq/). ABOUT THE CODE The code is a mix between C and Python. The state of some of the code is quite horrible and ununderstandable, but relatively bug-free, eh hopefully. :) CONTACT k.s.matheussen(a)notam02.no http://www.notam02.no/radium/ --

20 years, 8 months

[linux-audio-dev] Audio over Ethernet?

by Anders Torger

Is there any work done for transporting digital audio over ethernet? For example a library, an open standard or something? /Anders Torger

20 years, 8 months

[linux-audio-dev] how about a LADSPA BOF session at LAConf#2 ?

by Joern Nettingsmeier

hi richard, hi everyone! i'm just wading through 2k5 linux audio mails, as i'm a little behind on current affairs due to a lengthy and less-than-smooth moving of houses. after reading the LADSPA related threads of about a month ago, a couple of things became obvious to me: * LADSPA has some showstopper deficiencies to some developers * there seems to be an ongoing battle about how essential rdf metadata support should be: if it's purely optional, then many things that conceptually should be metadata must be duplicated in more or less inelegant additions to ladspa.h, and there seems to be no real consensus on how to do that. if metadata support is necessary even for simple hosts to create usable guis, we put the famed 'S' in danger. * at present, the discussion has reached the "matter of taste" point and is pretty much dead in the water. * with no real formal process for the development of LADSPA except for richard's role as the "benevolent dictator", and richard being very quiet on the matter, those developers who opt for an extension of the spec may feel there is no way to get their proposals through. * maybe for that reason, there has been some imho ill-advised rhetoric towards fait-accompli tactics. now wherever LADSPA is heading, one thing is very certain for me: LADSPA and JACK are the very two projects that absolutely *MUST* *NOT* *FORK* or even develop "local dialects" at this point in time. i'm not afraid of forks in almost all contexts, but a forked "common" api is a dead api. whatever happens, let's not jeopardize the two major kickass components of linux audio. there may come a time when LADSPA has become so inert and obsolete that we should take care of it the darwin way, but this time is still a long way off. for that reason, let's try to cram a LADSPA BOF into the already overflowing schedule at LAConf#2, or at least dedicate a "working dinner" to the future of LADSPA. i have this feeling that injecting the face-to-face factor and some german beer into the discussion might remove some obstacles. :-D richard, if you are reading this, some comment from your part would also be helpful imho. i found you have not participated in the ladspa discussions since release 1.1, which was in august 2002. it seems everyone still considers you the keeper of LADSPA, and it might clarify things if you stated * your opinion on the current discussion; * your criteria for approving extensions; * whether you are willing and have the time to retain the role of official LADSPA maintainer and to have the final say over what goes in or what doesn't, or let go of this role; * whether you can make it to LAConf#2 for a beer :) all the best, jörn -- The handles of a craftsman's tools bespeak an absolute simplicity, the plainest forms affording the greatest range of possibilities for the user's hand. That which is overdesigned, too highly specific, anticipates outcome; the anticipation of outcome guarantees, if not failure, the absence of grace. - William Gibson, "All Tomorrow's Parties" Jörn Nettingsmeier Kurfürstenstr 49, 45138 Essen, Germany http://spunk.dnsalias.org (my server) http://www.linuxaudiodev.org (Linux Audio Developers)

20 years, 8 months

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Linux-audio-dev April 2004