Linux-audio-dev

linux-audio-dev@lists.linuxaudio.org

3 participants
7520 discussions

[linux-audio-dev] more practical stuff about synth-programming -- jack seems to be less documentated

by hexe_2003＠directbox.com

( This email is a reply to one of my threads; but I deleted the originally mail, so I open another; to original thread asked you for some background information about pcm-data ...) hi, First I want to thank you for the ideas ( http://www.dspguide.com ; http://www.amazona.de ) ; and well, I am from Germany, so German articles are not bad :) But both are very theoretically. Both are very good, both are very interesting. I've not even finished both completely, because its much information you gave me... I'll see what I can really use in my little programme... . If you know something interesting stuff to programm a software (!) synthesizer, let me know :) . Somebody of this list said to me that "it would be much easier for me to use jack" . Well, I did not find ANY developer-documentation on the originally HP and I want to know if jack already HAS an easy-to-programm software synth implemented; If yes, where can I find further information ? ( I know that some of my questions could be answered by google, but I ALWAYS give it the wrong keywords :)) ) Greetz, Sascha Retzki __________________________________________________ Verpassen Sie keine eBay-Auktion und bieten Sie bequem und schnell über das Telefon mit http://www.telefonbieten.de Ihre eMails auf dem Handy lesen - ohne Zeitverlust - 24h/Tag eMail, FAX, SMS, VoiceMail mit http://www.directbox.com

22 years, 3 months

[linux-audio-dev] lowlatency test at linuxdevices

by Robert Jonsson

Hi, First I must admit right away, I only looked at the pretty pictures so far, but they where sufficiently nice for me to post it here ;-P. http://linuxdevices.com/articles/AT7751365763.html /Robert

22 years, 3 months

RE: [linux-audio-dev] next power of two

by Hannes Guddat

Very interesting, "in the name of all DSP programmers" - thanksalot! Do you have any estimation how many cycles this would spend on a pentium? I would have make a wild guess of about 16-21 cycles + call overhead (if not inlined).. Hannes P.S. Maybe you have similar code for the "bitreverse" operation.. ? just asking.. :) // // we apologize for the inconvenience // // Hannes Guddat // Fraunhofer IGD // A9 - Communication and Cooperation // Rundeturmstrasse 6 // 64283 Darmstadt // // Tel.: +49 6151 155-217 // Fax.: +49 6151 155-559 // > -----Original Message----- > From: linux-audio-dev-admin(a)music.columbia.edu > [mailto:linux-audio-dev-admin@music.columbia.edu]On Behalf Of > Maarten de > Boer > Sent: Mittwoch, 17. September 2003 14:22 > To: linux-audio-dev(a)music.columbia.edu > Subject: [linux-audio-dev] next power of two > > > Hi, > > A colleague of mine found this very clever algoritm to calculate the > next power of two for a given number. It comes from the > Prophecy SDK for > 3d game development > http://www.twilight3d.com/modules.php?op=modload&name=Download > s&file=index > > Since this is a kind of thing often needed in audio > processing, I wanted > to share it with you. I certainly can not think of a faster (or more > elegant) way of doing it. > > Maarten > > ////// > /// Returns the closest power-of-two number greater or equal > /// to n for the given (unsigned) integer n. > /// Will return 0 when n = 0 and 1 when n = 1. > ////// > inline uint32_t nextPowerOfTwo(uint32_t n) > { > --n; > n |= n >> 16; > n |= n >> 8; > n |= n >> 4; > n |= n >> 2; > n |= n >> 1; > ++n; > return n; > } >

22 years, 3 months

[linux-audio-dev] [ANN] Gungirl Sequencer 0.1

by Richard Spindler

Hi, this is the first Release of My new Linux Audio Sequencer. Gungirl Sequencer is an easy to use Audiosequencer. It includes a simple Filemanager and uses Drag & Drop to arrange Audiosamples. For more Information see http://homepage.uibk.ac.at/~csad2715/ggseq/

22 years, 3 months

[linux-audio-dev] pcm data -- plz give a short brief

by hexe_2003＠directbox.com

Good morning, I was looking for a good paper (tutorial / documentation) that describes howto calculate pcm data -- e.g. if I open my sounddevice (/dev/dsp), and sent randomed data to it, I am not really satisfied; I want to KNOW what data makes what sound. Of course I know that this is a short describtion of a whole lot of knowledge, but browsing the archive of http://www.musicdsp.org is a very hard way to REALLY learn how this works. Have somebody an idea where to begin ? greetz, Sascha Retzki __________________________________________________ Verpassen Sie keine eBay-Auktion und bieten Sie bequem und schnell über das Telefon mit http://www.telefonbieten.de Ihre eMails auf dem Handy lesen - ohne Zeitverlust - 24h/Tag eMail, FAX, SMS, VoiceMail mit http://www.directbox.com

22 years, 3 months

[linux-audio-dev] 2nd LAD conference - Call for papers

by Matthias Nagorni

Dear all, as announced earlier on this list, the 2nd LAD conference will take place April 29th - May 2nd 2004 at ZKM (Zentrum fuer Kunst und Medientechnologie, Center for Art and Media) Karlsruhe, Germany. http://www.linuxdj.com/audio/lad/eventszkm2003.php3 lists presentation material and reports of the 1st conference. See http://www.linuxdj.com/audio/lad/eventszkm2004.php3 for more information on the 2nd conference. Many participants of the 1st conference have already confirmed their participation for the 2nd one. Frank and I would now like to collect abstracts for planned talks so that we can set up a preliminary program. We would like to have this available as soon as possible so that we can advertise the event in computer music journals (such as german Keyboards ;-) and linux journals (Dave, Daniel, are you listening ?). If you plan to give a talk on Linux audio development or do a presentation of music you have done with Linux software, please send an abstract to both me and Frank Neumann (Frank.Neumann_AT_st_DOT_com). Please estimate the time you need for your talk so that we can set up a preliminary schedule. We have now three different locations for presentations: The lecture hall we used for the 1st conference, some seminar rooms and the Kubus, which is considerable larger than the lecture hall and has a built-in studio. The seminar rooms can be used for LAD internal presentations and discussion. The Kubus is ideal for presentations of high public interest, especially practical demonstrations of audio software. The lecture hall will be used for technical talks on software development. In short terms: Kubus is LAU, Lecture hall is LAD. More rooms imply the option of scheduling parallel sessions. We can only decide on this after we know roughly how many presentations are to be expected. This is another reason why early registration is helpful. Given the excellent conditions at ZKM and the many improvements of Linux audio software, the second conference promises to be even more successful than its predecessor. Matthias -- Dr. Matthias Nagorni SuSE Linux AG Deutschherrnstr. 15-19 phone: +49 911 74053375 D - 90429 Nuernberg fax : +49 911 74053483

22 years, 3 months

[linux-audio-dev] WINNING NOTIFICATION

by luckywinnersagent＠survivormail.com

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22 years, 3 months

[linux-audio-dev] how hard could this be?

by Paul Davis

http://news.harmony-central.com/Newp/2003/junXion-10.html the ALSA sequencer already provides 90% of the infrastructure described. all that is needed is something to read from the game controller and queue immediate MIDI events ...

22 years, 3 months

[linux-audio-dev] LL-patch for SuSE kernel?

by Uwe Koloska

Hello, is there anyone with a version of the LL-patch for SuSE kernels? (I use 8.2 with 2.4.20). Some hunks of the patch are always in the SuSE kernel (sometimes with small changes as other variable names) -- and this lead me to think that the SuSE kernels had included the LL-patch. Maybe (having the KEYBOARDS discussion in mind) it would be "a nice thing" if SuSE (and other distributors) have a LL-kernel ready to run. Uwe -- voiceINTERconnect www.voiceinterconnect.de ... smart speech applications from germany

22 years, 3 months

[linux-audio-dev] Lots of stuff...

by James Shuttleworth

Hi, Firstly, some info on myself. I've been a linux user for a few years, and I've been dabbling with computer based music for a long while (Scream Tracker... I still love you!). Right now, I have a dual boot machine - windows for Cubase SX, linux for everything else. Every now and then, I have a look at what's going on with linux music software, but so far I can't justify moving from Cubase. Now, the meat of my mail: 1. I can program. Really, I can. I have a Soft. Eng. degree and I'm going to start writing my PhD thesis soon (within 6 months, hopefully). I've got a basic to good knowledge of quite a few languages: perl, python, C, C++, Java, mostly. So I should be able to write the groovy audio apps I want, right? No. There are huge areas where my knowledge is lacking - optimisation, basic techniques for real-time programming, efficient implementations for standard things, etc. This isn't because I can't learn them, but because, so far, I haven't needed to. I browse around the internet, looking for some kind of repository of this kind of knowledge, but I can't find it. If you know where it is, please let me know. So, my first question is: where does a newbie go to learn? I doubt Native Instruments or Steinberg will be quick to tell me the tricks and hacks that they use. 2. The big app... I see lots of things in development, but that seems to be the problem - they are lots of separate things. Now, I hear that Jack is the next big thing, but is it enough? It seems like a great idea - synchronise multiple multiple apps and mix their output - but I can't see this being enough. I think it seems more suited to using a couple of apps together than for combining instruments into a track. When I write something in Cubase, I expect to click "save" and for all my connections, parameter values, automation, mixer settings, etc. to be stored, ready to be opened next time I feel like it without having to go through a number of apps and remember which files went with this project. Maybe I'm wrong - I hope I am - but Jack doesn't appear to come close to Cubase in this respect. Is there something else out there? 3. I want to know the state of play. Not of one app, but of the whole linux audio scene. Which apps work together? Which apps have debs, rpms, mdks, or whatever. Is there some kind of site like this? If there isn't, how about we build one? Something that would really keep it all together. Imagine: - Articles for developers and users - FAQs that cover a whole host of apps - Info on the current state of apps - Pre-compiled packages that work together - something like demudi would be good, but more as a work in progress system - something we could all use to test software, interoperability, etc. in an environment that is (as much as possible) what the end users will have. - Tutorials, links, guidelines. Now, guidelines is a good idea! - A big, all encompassing TODO list. - A combined effort on documentation. I think a nice manual that covers a whole audio setup would be good. 4. I'm fully intending to start writing audio apps. My first attempt will be a tracker - something I can cut my audio teeth on and produce something I want. I really do like the tracker paradigm. Anyway, any pointers are welcome - especially concerning things in item 1. I intend to document my progress and hopefully turn it into a guide to writing audio apps for people who are in my position right now. Of course, if it all goes wrong, it might become a what-not-to-do kind of document, but I hope not. So, this is my first contributin to the list. Please let me know what you think. Flame me, call me a git/idiot/moron/whatever, just don't ignore me ;) James

22 years, 3 months

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Linux-audio-dev