Linux-audio-dev January 2003

linux-audio-dev@lists.linuxaudio.org

99 participants
111 discussions

[linux-audio-dev] [Fwd: Re: Sidechains, was Re: [linux-audio-announce] [ANN] swh-plugins 0.3.4]

by Robert Jonsson

Out of order forwarding... This should have gone to the list also... Hi, > >>* I don't know if other types of plugins are applicable to this, but >> since the sidechain is a separate plugin you could make _any_ plugin >> sidechain aware. mmmm audio controlled room-size for reverbs...mmmm >> :-D. > > > Ahh, theres a misundersantding about what sidechains do here, they really > are just an audio stream. Hmmm, how do you recon? A sidechain for a compressor may be an audio stream, but it's the "control" behaviour of that stream that is of interest, right? That should mean that it would be possible to extract just the behaviour and only distribute "that". But I may very well be misunderstanding, this is mostly theory for me, I haven't had much real practice with this kind of stuff. > >>Top priority is a LADSPA stereo delay, I couldn't find one in Steves >>collection. >>But it would also be nice with: >>- stereo autopanner >>- auto sweeping filters. >>Apologies if these infact are available and it's just my poor eyesight. > > > What do you want from a stereo delay? There is an left-centre-right delay, > but thats actually a mono delay that takes stereo input and pans the > result. A stereo delay would be easy to implemnt, what controls do you > want? An example: Recording a guitar in mono (Sounds dull). Easy way to make it more lively is to add an stereo effect, delay is my preference. For the above example a mono-->stereo plug would suffice, but stereo-->stereo is more versatile. Muse handles the mono->stereo conversion internally. As for parameters I'd like separate delays for left and right, apart from that I'm open for suggestions... I'm no pro, I learn as I try :). > > There is an auto-phaser (sweeping allpass filter), but no auto wah > (sweeping bandpass), or auto panner, true. I tend to build things like > that out of SSM or pd. But there should be complete plugins. Ya, working mostly in MusE I'm somewhat limited in the number of solutions I can try. Currently MusE only supports basic features (pretty much modeled after Cubase). /Robert

22 years, 4 months

[linux-audio-dev] Fwd: Re: Sidechains, was Re: [linux-audio-announce] [ANN] swh-plugins 0.3.4

by Steve Harris

Sorry, replied direct to Robert, not list. ----- Forwarded message from Steve Harris <S.W.Harris(a)ecs.soton.ac.uk----- Date: Fri, 10 Jan 2003 09:25:32 +0000 From: Steve Harris <S.W.Harris(a)ecs.soton.ac.uk> Subject: Re: Sidechains, was Re: [linux-audio-announce] [ANN] swh-plugins 0.3.4 To: Robert Jonsson <robert.jonsson(a)dataductus.se> On Fri, Jan 10, 2003 at 09:47:26 +0100, Robert Jonsson wrote: > >SC4 is more-or-less like SC3, but has no sidechain and a subtly different > >algorithm. The sidechain was confusing hosts. > > > > Yes, I was wondering how the 3<-->2 port sidechain compressor plugin > would be handled in hosts... The answer is 'badly'. ;) > What if the sidechain was a separate ladspa plugin that in turn uses > some ipc mechanism to communicate to the plugin being controlled? > I have no idea what kind of ipc is best for this, named pipes seem easy > but they are probably slow, yes? Pipes are non-deterministic, so banned in LADSPA. The only one thats an option is shared memory. > By using one of the controls of the ladspa plugin to select which > sidechain "channel" (e.g. 1-10) they should send and receive on (much > like a comm-radio) you could have several different sidechains up and > running simultaneously. Its an interesting idea. > This construction has a number of interesting side effects (pun not > intended): > * 1-n setups can be produced, one sidechain can control several effects. > * Atleast with named pipes the control would be application agnostic. > The sidechain would not need to be used in the same host as the effect > plugin. The same is true of SHM, but if the hosts are not running in sample sync all hell will break loose. > * I don't know if other types of plugins are applicable to this, but > since the sidechain is a separate plugin you could make _any_ plugin > sidechain aware. mmmm audio controlled room-size for reverbs...mmmm > :-D. Ahh, theres a misundersantding about what sidechains do here, they really are just an audio stream. > Any thoughts? Neat idea. Kinda evil though. Very tempting... > Top priority is a LADSPA stereo delay, I couldn't find one in Steves > collection. > But it would also be nice with: > - stereo autopanner > - auto sweeping filters. > Apologies if these infact are available and it's just my poor eyesight. What do you want from a stereo delay? There is an left-centre-right delay, but thats actually a mono delay that takes stereo input and pans the result. A stereo delay would be easy to implemnt, what controls do you want? There is an auto-phaser (sweeping allpass filter), but no auto wah (sweeping bandpass), or auto panner, true. I tend to build things like that out of SSM or pd. But there should be complete plugins. - Steve

22 years, 4 months

Re: [linux-audio-dev] Networking Linux audio folks

by Patrick Shirkey

>Perhaps just adding a couple check buttons to the database: > >[X] Available for professional Linux Audio consulting >[X] Available as a Linux audio community node Easy enough to add. >There could then be 2 entry points to the >database, one catering to the company or individual looking for a Linux >audio consultant and another for those wanting to connect with other >audio developers. The latter being more losely based since one would >not necessarily need to be a professional to just meet others. I'm still looking for the appropriate name for this db. I want it to provide all the functionality that we need to allow users and developers to do real networking. Whether that is for paid work or just to arrange meetings with people in an area you may be travelling to/through. I think it makes sense that as part of a comunity that is based on openness we provide a way for people to get a little background info on us. I also hope that this database will present one more level of professionalism to the Linux audio developers public image. >I like the idea of having an email proxy so that one could hide their >email address (as an option) and a form could be provided that would >email the user from the internally stored address. I think the idea of >Spam might scare away some people from putting their info in the >database (like me). I can make it more spammer unfriendly. I'll think about how. Currently there is a form mailer provided to allow people to contact directly from the site. Since setting this up for my business site a couple of years ago it has proven to be a good way for people to contact me. So I have provided this feature for the db also. That is possibly the most useful feature on the site. Anyone (not tested with lynx) can contact you directly. >Perhaps this might already be the case (haven't tried submitting >anything yet to the database) but having the street address info be >optional is good (just city/country is probably sufficient in many >cases) as well as phone number and any other items related to privacy. >Indicating optional and required fields would be nice on the entry >form. Currently the only required entry is an email address. Soon I will have a proper login faciltiy so there will also be a password required. >Maybe a resume URL would also be good, so if one is browsing through >lots of entries they can quickly jump to individual's resumes. I figure this belongs in the specifics column. I will make it parse these entries for urls and automatically create links. On that note would anyone find it useful to have a photo column? -- Patrick Shirkey - Boost Hardware Ltd. For the discerning hardware connoisseur Http://www.boosthardware.com Http://www.djcj.org - The Linux Audio Users guide ======================================== Being on stage with the band in front of crowds shouting, "Get off! No! We want normal music!", I think that was more like acting than anything I've ever done. Goldie, 8 Nov, 2002 The Scotsman

22 years, 4 months

[linux-audio-dev] [ANN] swh-plugins 0.3.4

by Steve Harris

http://plugin.org.uk/releases/0.3.4/ Hods of changes, including: * Bugfixes to GSM sim (Pascal Haakmat) * Bugfixes to FM osc (Pascal Haakmat) * Bugfixes to audio divider (Nathaniel Virgo) * Added another compressor, SC4, stereo, no sidechain * Added lookahead brickwall limiter * Added L/C/R delay (requested by Marek Peteraj) * Added Giant flanger (kind of requested by Patrick Shirkey) * Added DJ Flanger (actually requested by Patrick Shirkey) * Should now compile on FreeBSD * Fixed syntax error in RDF metadata, works with Bob H's jack-rack now I've updated the AUTHORS list, but I've undoubtedly forogtten people, so if youre not in there and should be give me a shout. SC4 is more-or-less like SC3, but has no sidechain and a subtly different algorithm. The sidechain was confusing hosts. The limiter has up to two seconds of lookahead, so can be very gentle. The L/C/R delay might be a bit familiar to Korg Trinity users ;) I haven't used it much bet it seems pretty cool. The giant flanger was a mistake, but I left it in anyway. The DJ flanger hjas controls for LFO period (instead of frequency as you would have in a synth) and you can resync the LFO by clicking a toggled control*. - Steve * This reminds me, there would be a use for a MOMENTARY hint (implying or requiring TOGGLED) in LADSPA, that meant that a control port should only be held high while the UI control was held down, otherise you have to double click reset controls, which is confusing.

22 years, 4 months

[linux-audio-dev] [ANN] ecasound 2.2.0 released

by Kai Vehmanen

1. A short summary of changes Support for JACK and LADSPA 1.1 added, more intelligent runtime parameter selection, ECI licence changed from GPL to LGPL, new NetECI client API, ecasound emacs mode added, largefile support, new resample, reverse and typeselect audio objects, new peak amplitude chain operator and new utilities ecalength, ecamonitor and ecasignalview. --- 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. Ecasound is licensed under the GPL. The Ecasound Control Interface (ECI) is licenced under the LGPL. --- 3. Changes since last release Although over a year has passed since the last major stable release, ecasound development work has not stopped. To put things into perspective, a diff between 2.0.0 and 2.2.0 takes about 1.7MB of space. Considering the whole 2.2 codebase is just over 2MB, this is quite a lot! In the future there will hopefully be much more frequent releases. Here's a list of most notable changes: * Intelligent parameter configuration. Instead of one set of default parameters, ecasound lets user specify different parameters for three predefined profiles: real-time, real-time-low-latency and non-real-time. When starting processing, ecasound will automatically select and use most suitable profile for the given configuration. Ecasound will not only consider the types of objects, but also the runtime environment: whether it is possible to lock memory, to use RT-scheduling and so on. * The Ecasound Control Interface is now licensed under LGPL. In addition, the ECI implementations are now standalone, and do not require linking against libecasound and libkvutils. Only thing needed to run ECI apps is to have a working ecasound executable installed. * JACK support added. This is a major new addition as it involved making relatively large changes to the ecasound engine. * Up-to-date support for ALSA-0.9 and LADSPA-1.1. * Effect preset improvements. Support for parametrized presets has been improved. For instance it's now possible to write a wrapper effect preset for a complex ecasound effect or LADSPA plugin, and only publish a subset of original effect's parameters. * The disk i/o buffering subsystem that was introduced in ecasound 2.0 has been integrated more closely to the ecasound engine leading to better performance and reliability. * NetECI API. Ecasound now has a daemon mode that allows multiple clients, using the NetECI protocol, to connect to a running ecasound session. A proof-of-concept client, ecamonitor, is included in the package. It can be used to monitor ecasound session status from a separate console. This is especially useful in combination with ecasound's console mode user interface. The console interface can be used for control and the NetECI monitor client for getting real-time status information. In addition, NetECI can be used with all ECI apps. * Ecasound.el, an emacs ecasound mode and a Lisp ECI implementation. * Largefile support for reading and writing audio files larger than 2GB. * New audio object types: JACK, resample, reverse, typeselect. * New chain operators: peak amplitude monitor * Utilities: ecalength and ecamonitor added, ecasignalview totally rewritten. * New ECI implementations: Lisp, Perl and PHP (the last two are not included in the main ecasound package) Full list of changes is available at <http://www.wakkanet.fi/~kaiv/ecasound/history.html>. --- 4. Interface and configuration file changes * Command line options: 2.2 is backward compatible with 2.0 releases, so old scripts and .ecs files should continue to work. See ecasound(1) for more info. * Ecasound Interactive Mode (EIAM): No changes to the commands available in 2.0 releases. See ecasound-iam(1) for more info. * Library interfaces: Major changes in all library interfaces. Direct use of these libraries is no longer encouraged. The ECI and NetECI APIs are preferred for developing new applications on top of ecasound. * Ecasound Control Interface (ECI): No interface changes. * The ~/.ecasoundrc config file is no longer used. The new location is ~/.ecasound/ecasoundrc. As there's now a separate global configuration file, it is no longer necessary to duplicate all config variables in the user config files. See ecasoundrc(5) for further info. --- 5. Links and files Web sites: http://www.eca.cx http://www.eca.cx/ecasound - http://www.alsa-project.org http://jackit.sourceforge.net http://www.ladspa.org Source and binary packages: http://ecasound.seul.org/download http://ecasound.seul.org/download/ecasound-2.2.0.tar.gz Distributions with maintained ecasound support: Agnula - http://www.agnula.org Debian - http://packages.debian.org/stable/sound/ecasound.html http://packages.debian.org/unstable/sound/ecasound2.2.html DeMuDi - http://www.demudi.org FreeBSD - http://www.freebsd.org/ports/audio.html Gentoo Linux - http://www.gentoo.org PLD Linux - http://www.pld.org.pl PlanetCCRMA - http://www-ccrma.stanford.edu/planetccrma SuSE Linux - http://www.suse.de/en Note! Distributors do not necessarily provide packages for the latest ecasound version. -- http://www.eca.cx Audio software for Linux!

22 years, 4 months

Re: [linux-audio-dev] Networking Linux audio folks (was Unified Audio Plugin Architecture (Meeting))

by Patrick Shirkey

>Anyone remember the project mentioned on LAD before about an online >Linux Audio tech database? Cheers. That was me. http://www.djcj.org I will be working on improving the functionality soon. I have been overloaded recently actually playing music. Makes a nice change from wanting to but not having the correct resources. All open source of course. Anyway, I would like to have more feedback on the way the database is setup, displayed... Feel free to add your name. I originally intended it to be for paid support work but if it evolves into a more general database then I'm happy to do my part to get it there. I will focus on making it user configurable over the next few weeks. I have been contemplating it for the past few days. Sometimes it nice not to get sucked into the net. Almost like taking a vacation :) -- Patrick Shirkey - Boost Hardware Ltd. For the discerning hardware connoisseur Http://www.boosthardware.com Http://www.djcj.org - The Linux Audio Users guide ======================================== Being on stage with the band in front of crowds shouting, "Get off! No! We want normal music!", I think that was more like acting than anything I've ever done. Goldie, 8 Nov, 2002 The Scotsman

22 years, 4 months

[linux-audio-dev] Re: (fwd) Unified Audio Plugin Architecture (Meeting) (Paul Davis )

by RonKuper＠Cakewalk.com

> Why not? Shouldn't these sorts of discussions be wiiiiide open, Paul? > Or is it just a matter of it being too soon, and thus there being > nothing to talk about? The discussions will of course be wide open, most likely held on an email listserv, once one gets set up. To encourage more participation, it is also likely that the discussion will be overseen by the IASIG rather than the MMA. Right now the whole proposal is in the "idea" stage. There is no definite spec. I think the ultimate aim would be to cherry pick the best of what's out there, and try to build a standard that is both "best of breed" and "lean and mean" -- if such a thing is possible. :-) ----------- Ron Kuper VP of Engineering Cakewalk http://www.cakewalk.com

22 years, 4 months

[linux-audio-dev] (fwd) Unified Audio Plugin Architecture (Meeting)

by Paul Davis

If anyone can get to this, it would be a great idea. I might even consider using a frequent flyer ticket for this. not sure yet. --p ---------------------------------------------------------------------- To: various folks cc: mma(a)midi.org From: RonKuper(a)Cakewalk.com Subject: FW: [mma-members] Announcement: Item #183 Unified Audio Plug-In Architecture Hi folks, The following announcement may be of interest to you. The initial discussion on this proposal will be held at NAMM in about 2 weeks. Note that this meeting is not restricted to MMA members, so I would urge anyone who is interested and would like to attend, to please do so. Also, as far as I know you do not need a NAMM convention badge to attend this meeting. The meeting will be held on Sunday, January 19 from 4:30 PM - 5:45 PM at the Anaheim Marriott. I'm not sure what the actual conference room will be; so far it's only been designated as "MMA Meeting Room A". I hope to see you there! ---------- Ron Kuper Cakewalk ******************************************** MIDI MANUFACTURERS ASSOCIATION MEMBERS FORUM ******************************************** A new MMA working group has been formed for discussion of a Unified Audio Plug-In Architecture. The proposal from Ron Kuper of Cakewalk is attached below. The Working Group Chair is Ron Kuper (Cakewalk). The TSB Representative is David Miller (Microsoft). For the moment, discussion will take place on the mma-members mailing list. If the email traffic gets heavy, a new separate working group mailing list will be created. A discussion session will take place following the AGM on Sunday January 19th. Please respond to this message if you would like to join the working group. ===================================================== Item # 183 - Unified Audio Plug-In Architecture Submitted by: Ron Kuper Company: Cakewalk The professional audio market offers a variety of audio plug-in formats, some hardware based, some software based, all entirely incompatible. These plug-in formats include Audio Units (Apple), DirectX (Microsoft), DXi (Cakewalk), JACK (Linux), LADSPA (Linux), MAS (MOTU), MFX (Cakewalk), OPT (Yamaha), ReWire (Propellerheads), RTAS (Digidesign), TDM (Digidesign), VST (Steinberg), VSTi (Steinberg). While these are touted as standards, they are in fact proprietary, and the companies responsible for their development assume a heavy documentation and support burden. Furthermore, unlike true standards such as MIDI, they do not actually enable interoperability between vendors. Instead, they fragment the music software industry into "tribes" of vendor allegiance. The large number of competing formats means that audio plug-in developers must either incur the high cost of developing for multiple formats, or else take the business risk of focusing on a single format. Host application vendors face the same dilemma when choosing which formats to support in their applications. We propose to develop a single audio plug-in framework, a cross-platform standard for audio plug-ins and software synthesizers. The key design objectives for this standard are: - Transport neutral: can stream in memory, PCI, Ethernet, WiFi, etc. - Low-overhead - Adaptive to hardware - Platform and programming-language neutral - Compatible with existing standards, e.g., MIDI (for parameterization and data); XMF (for serialization); AAF (for project interchange) - Easy to "wrap" in existing formats such as DirectX or VST What is encouraging is that all of these standards differ only in terms of programming interface. They all provide equivalent levels of functionality. The goal then is to define a standard core level of functionality that will support all of the common features among existing plugin standards, yet be easily encapsulated by the vendor specific interfaces. In other words, the goal would not be to replace TDM, DirectX, VST, etc with a common interface, but rather to define a low-level interface to a reusable DSP core that could be then packaged as TDM, DirectX, VST, etc. ----------------------------------------------- The contents of this message are Copyright 2002 MIDI Manufacturers Association Incorporated and not to be reproduced or distributed in any form without express written permission.

22 years, 4 months

[linux-audio-dev] that forward

by Paul Davis

i made a small mistake in forwarding the message about the UAPA meeting. it was not intended for public dissemination, even though the meeting is open to the public. my bad, as they say. --p

22 years, 4 months

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

by Fernando Pablo Lopez-Lezcano

> >I browsed the Kernel Source and there is only one mark_inode_dirty in > >pipe_write (in fs/pipe.c). So we know where it is hanging... > > > >And in __mark_inode_dirty (in fs/inode.c) there is one > > spin_lock(&inode_lock) > >call, and I guess that is where the whole thing is hanging. So something > >is holding that lock... how do I find out who is doing that? Apparently > >the handling of inode_lock is confined to inode.c. I'll keep reading. [Andrew Morton had suggested that the stack traces did not show problems with stuck locks in the kernel...] > >Maybe the pipe in question is one of the pipes that jack uses for ipc? > > seems *damn* likely ... sorry to just be chiming in with a useless comment! One more (small) datapoint. Roger Larsson sent me off the list a couple of small utilities (VERY nice tools!) that monitors the cpu usage of SCHED_FIFO processes and after a timeout actually downgrades the persistent hogs to SCHED_OTHER. So I run that in a terminal and after playing around with a bunch of jack apps got the machine to lockup... and then, after a little bit, suddenly, it came back to life! (you could see that the monitor had changed the priority of the hogs to SCHED_OTHER). So I guess that somehow jack has a hard to trigger race condition that locks up the machine when running SCHED_FIFO. Now I have to figure out how to trace the thing so as to determine where the whole thing is locking. Help from the jack gurus appreciated. -- Fernando

22 years, 4 months

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Linux-audio-dev January 2003