Linux-audio-dev

linux-audio-dev@lists.linuxaudio.org

4 participants
7509 discussions

by Darren Landrum

Okay, I'll see if I can make up for my awful post from before with a constructive question. If you wanted to quickly prototype an idea for a DSP routine, how would you go about it? It would need to work in real-time, but it wouldn't really need to be super-efficient for testing ideas. Thank you for the help. -- Darren

17 years, 5 months

alsa and OSS (again?)

by victor

Hi everyone, and interesting thread has been going on the olpc devel list. It would be interesting to get your comments on one of the statements that were posted there (I'll leave you to check the thread on the list archives http://lists.laptop.org/pipermail/devel/). This particular e-mail goes (in response to me asking why they were complaining about alsa and asking for OSS: "OSS in general, or OSS on Linux? He did say "OSS 4", which is the current version of the API. Solaris and all *BSD use it, along with random SysV-like things. As far as sound on the UNIX-like platforms goes, OSS is the standard. Probably it ought to be proposed for the next POSIX/UNIX standard. You can read Hannu's take on the matter in his blog. This entry is particularly informative, but note that the code has since been released under the GPL. http://4front-tech.com/hannublog/?p=5 More on the ALSA defects: http://lkml.org/lkml/2007/7/6/397 Basically we got swindled. ALSA has not been the utopia that it was claimed to be. ALSA sucks. It's not even documented." Hannu's text sometimes reads as propaganda. But it would be nice to hear the opinion of other developers. As far as I am concerned, for about five years now I have not even looked at OSS anymore. But should I reconsider? Thanks Victor

17 years, 5 months

Call for conference

by Benjamin Coudrin

Hi, There is a Free Software event in south of France this summer. We would like to make a place for libre audio and libre culture, which includes conferences and workshop around the tools (softwares), the diffusion (medias, communities, ...), the licences, the users (examples of audio studio using free technologies, examples of libre artits, ... ) So don't hesitate to send your propositions Here is the official call for conference : >From 1st to 5th July 2008, the Ninth Libre Software Meeting(9th LSM) will take place in Mont-de-Marsan, in south of France. Hundreds of conferences, workshops and showings will be programmed. To maintain the interest of the public, it is important for LSM to renew the content of different themes. So, if you participate in a new or unknown project, if you wish to share your passion and your libre software experience, we will gladly welcome you during LSM 2008. We start a large call for communications on the following axes : - thematic conferences - all subjects are interesting, particularly those we have not thought about ... - projects or libre softwares presentations - workshop animations (development, initiation, ... ) To propose to the public a rich and various content, please send your propositons, suggestions and ideas before February 8th to appel2008 at rmll.info *Contacts :* (program directors) Nicolas Ducoulombier : nicolas at ldd.fr <nicolas%20at%20ldd.fr> Christophe Merlet : redfox at redfoxcenter.org<redfox%20at%20redfoxcenter.org> The definite programme, theme list, conferences and contributors will be highly influenced by the feedback we will get from this call for contributions. Do not hesitate to participate and give worthy projects wide visibility. -- Benjamin Coudrin benjamin.coudrin(a)gmail.com (+33)6.09.11.00.83

17 years, 5 months

[ANN] miniloop-0.0 Released

by Nick Thomas

miniloop is a simple live looping program. It can load a number of stereo audio loops of equal length from the disk and loop them in sync with each other, sending each loop to a different pair of JACK audio outputs. These outputs are intended to be subsequently fed into an external software mixer, such as Ardour. For live performance, you will want to control the mixer using a MIDI control surface. miniloop is similar in intent to Stephen Sinclair's LoopDub. I actually created miniloop to explore some design ideas that I had while working on LoopDub. Given that, it is appropriate to provide a comparison between the two programs. The most important difference is that LoopDub uses a built-in mixer, while miniloop uses an external mixer. This means that miniloop is more flexible, but requires a more complex software setup. Another important difference is the user interface, which is radically different, and, I hope, somewhat easier to use. Finally, LoopDub has many features that miniloop lacks; miniloop is currently quite small (~500 SLOC) and quite feature-poor, and I intend to keep it that way. Project homepage here: http://code.google.com/p/miniloop/ Download here: http://code.google.com/p/miniloop/downloads/detail?name=miniloop-0.0.zip

17 years, 5 months

LatencyTop

by Jan Weil

Not sure whether this is any good with respect to real-time audio. "LatencyTOP is a Linux tool for software developers (both kernel and userspace), aimed at identifying where system latency occurs, and what kind of operation/action is causing the latency to happen. By identifying this, developers can then change the code to avoid the worst latency hiccups." <http://www.latencytop.org/> It's part of Intel's OSS initiative: <http://oss.intel.com/>

17 years, 5 months

LV2 "isn't well thought out ?" LV2 in the Reaper sequencer

by Benno Senoner

Hi all, the a bit provocative title is not here to start a flame war but to spark a constructive discussion about the viability and future of the LV2 plugin standard in the professional audio application market. Some background: as you probably know Steinberg just released VST3 and developers do not seem happy with it as it is not backwards compatible, not many new features and it seems less portable amongst platforms than VST2.4. Users are unhappy and started a long discussion: http://www.kvraudio.com/forum/viewtopic.php?t=204080&postdays=0&postorder=a… The discussion was picked up on the Reaper forum too. For anyone not familiar with Reaper, it is a very good audio,midi sequencer. http://www.reaper.fm It is a windows app but runs very well under wine and the company writes this on their page. Users like Alex Stone are using it on wine in conjunction with LinuxSampler The authors are Justin Frankel from Nullsoft and others. For those that don't know the name, he is the one that wrote winamp, gnutella, nullsoft installer etc. On a forum he said he played with the idea of open sourcing reaper. It is being ported to OS X and probably will get ported to Linux too, given the very good performance it achieves on wine. Now back to LV2: The VST3 discussion on the reaper forum resulted in users proposing to create a new plugin standard in order to "break free" from proprietary standards so they are proposing to add LV2 support to Reaper. Justin from Reaper answered the following on the forum: ------- I looked at LV2, there's a lot of stuff which I disliked.. for example, "ports" being for parameters and audio buffers (and presumably MIDI events), and all having the possibility of colliding, isnt well thought out. Also if you want to add parameters to a new revision of a plug-in, then you have to change the URI? ick. Or what if you want to change the I/O of a plug-in on the fly.. -Justin --- see here for the full thread: http://www.cockos.com/forum/showthread.php?t=17198&page=2 I did not look at LV2 so I cannot judge, but I think LV2 developers should discuss about these issues and concerns with Justin in order sort out problems, and given the joung nature of LV2 , in case important design flaws get uncovered, change the specs a bit. Reaper is rapidly building up a large user base (users switching away from cakewalk sonar and cubase to reaper) as the application provided excellent performance, is easy to use and new features are being incorporated at a fast pace. Dave Philips seem to love the app too as he mentioned it in Linux Journal and he posts frequently on the forum. http://www.linuxjournal.com/node/1005911 I think LV2 and Reaper developers should join forces because together perhaps it will be possible to impose a new open plugin standard which will get adopted by other commercial applications too and supersede VST2.4 over time. not sure if the reaper devs are reading LAD, so perhaps LV2 developers should answer on the reaper forum too in order to sort out the issues raised by Justin. Everyone is invited to add his own point of view and I hope that the outcome will be a positive collaboration between LV2 and Reaper. thanks everyone, Benno

17 years, 5 months

Re: [LAD] [LAU] one more to watch ?

by Jay Vaughan

On Jan 22, 2008, at 2:45 PM, M-.-n wrote: > more linux music on the go ? > http://www.openpandora.org > http://pandora.bluwiki.com/ definitely one to watch .. i hear a rumour that devboards are out and about for this already .. should be good to go in march if all goes well, and the world doesn't slide into a mass depression in the meantime .. ;) also, the neo1973-GTA02 version should be a nice little machine for portable music-making, soon enough. i'm having a blast with pulseaudio on my gta01 .. gonna be nice to have some power increase (and new graphics) in the new version. insmod gadget-audio for the win, w00t! ; -- Jay Vaughan

17 years, 5 months

Hello.

by alex stone

Hello all, my name's Alex Stone, and Benno From Linuxsampler pointed me in this direction to see what you guys who build stuff are up to. Frankly I've been amazed at the talent on display to use a phrase. Linux audio has come a long way since i last peeked in some 8 or 10 years ago. I'm currrently usiing a programme called Reaper, in wine in Linux, but i am keen to see a complete native solution come to maturity. I've had the privilege of communicating with some of you already, and as my linux journey is a recent one, i've been assisted, and encouraged by some great fellas, who know their stuff. Anyway, the introductions are done, and handshakes are made. I hope i can contribute something here from a user's perspective, and as someone fairly well versed in using audio and production programmes on the 'other side of the fence'. I've finally seen the light, and gained my freedom. As a former orchestral player, i'm more inclined to use programmes from a classical composer's perspective. and as some of you know already, i've tried to convey what it's like to write classical music with a computer, and the challenges that go with that, the biggest of all usually being the number of audio or midi ports available, and the capability possible for using a large number of instruments, often with several for one section with variations in articulation. My respects and thanks to those who have helped and encouraged so far, and i hope i can give something back as my knowledge continues to grow.. Alex Stone.

17 years, 5 months

Re: [LAD] [Jack-Devel] JACK & MIDI

by Julien Claassen

Hi again! Well Phil you said, that the new protocol wouldn't be understood by anything. So why not first take it easy and take a look at what already exists. OSC was mentioned here a couple of times? Might that be an idea? And about the two APIs: why not? If you think about it thorroughly I'm sure one can come up with a protocol, of which MIDI is a subset. Thus some interaction between to apps (one using MIDI, one using the new thing) could be possible. At the moment we have audio and MIDI ports, add a third kind of ports. And thus if you use plain old MIDI there's no more overhead, than there should be. Kindest regards Julien -------- Music was my first love and it will be my last (John Miles) ======== FIND MY WEB-PROJECT AT: ======== http://ltsb.sourceforge.net the Linux TextBased Studio guide ======= AND MY PERSONAL PAGES AT: ======= http://www.juliencoder.de

17 years, 5 months

[RELEASE] jack-audio-connection-kit 0.109.0

by Pieter Palmers

Dear Linux Audio users, A new jack release (0.109.0) is available: http://sourceforge.net/project/showfiles.php?group_id=39687 Enjoy, Pieter (Releaser-ad-interim) Changelog ========= API changes: * add jack_thread_wait API * remove port_(un)lock functions * add new time APIs * add port aliases * add new client registration callback * add port connect callback Backends: * ALSA: fix for use of snd_pcm_link * ALSA: hardware jack-midi support * ALSA: fix for enabling big-endian 16bit format discovery * ALSA: hardware jack-midi support * FreeBoB: fix deallocation segfault * FireWire: add 'firewire' backend for use with FFADO * OSS: add support for proper triggering in OSS driver when in full duplex mode * ALSA: fix illegal use of ALSA API * OSS: disable software mixing and samplerate conversions on OSS 4.x * CoreAudio: fix sample rate management Other * add JACK_PROMISCUOUS_SERVER handling * make /dev/shm the default tmpdir * add -Z flag to cancel zombification on timeout * add per-port update total latency * increment default watchdog timeout to 10sec

17 years, 5 months

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Linux-audio-dev