Linux-audio-dev

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7513 discussions

Re: [linux-audio-dev] KEYBOARDS: Linux is not suited for audio applications ...

by Stefan Nitschke

> >Hello, > >the german magazine KEYBOARDS has answered a readers question about audio >and linux with tremendous ignorance. I think this is a good chance to push >linux to the attention of "the masses". > >Here is the full text of question and answer (first in german, so anyone >can correct my errors ;-). > >... snip well the answer from the guy is in my opinion correct atleast for now. You need a LL-patch to get audio work as desired and AFAIK there is no main stream distro with that patch already applied. Please dont misunderstand me, i love audio on Linux but there is still some work to do until its is ready for "anyone". And i think thats what the answer was about. - Stefan _________________________________________________________________ Add photos to your e-mail with MSN 8. Get 2 months FREE*. http://join.msn.com/?page=features/featuredemail

22 years

Re: [linux-audio-dev] Wrote a real time safe memory allocator in C++

by Benno Senoner

Greg Reddin wrote: > Is there a web resource or book or something where one can learn > about these programming caveats for audio developers? I knew nothing > of this problem, but it makes sense when you mention it. I don't think that there is an all-in-one howto around, most infos are scattered around the net (and most issues can be solved with a bit of knowledge of the real time paradigm and a bit of common sense) > > > Or do I just have to do this for a few years and learn the hard way? > :-) Most developers seems to do so, they are just too lazy to think about the constraints that real time programming imposes. They believe they can make full use of the operating system, call any system calls they like, C++ constructors, malloc()s etc, accesss to mutexes locked by low priority GUI threads and then after wonder why their application does not work with low latencies or why there are sporadic dropouts they cannot get rid of. most problems go away if you increase the buffer sizes (thus latency) to let's say 20-50 msec, but as we know any soft-instrument with bigger than 15-20msec latencies becomes unplayable (measured by professional standards). Anyway there are not many rules to follow: run the audio thread SCHED_FIFO (and do not use SCHED_FIFO on other threads, except when you know exactly what you are doing). in the audio thread just do not call any system calls except read/write to the audio device . especially file system ops memory allocation, calling C++ constructors/destructors (cause memory allocation/deallocation) etc. Basically any operation that could possibly be blocked because it has to wait for some event, data, etc. Do all communication between audio thread and other threads via lock free FIFOs or shared mem. Avoid mutexes like they were radioactive material. (there are a few execptions where they are allowed like using mutexes between two real time threads where you know that they will not tie up the CPU for more than a certain amount of time, or using pthread_mudex_trylock() in the audio thread that tries to acquire the mutex but if it fails it returns immediately without stalling). For example Ardour is well designed in this regard, and this is why Paul is an experianced programmer (and probably learned some RT issues the hard way too). Unfortunately many audio apps on linux do not meet "low latency standards" or better are not designed with real time safeness in mind and I think it is one of the obstacles that keep them out of the professional domain making them look like a toy. It is sad because there are many nice apps with an excellent sound generation engine, but often the framework around that engine is weak. It does not that actually that much energy to fix it but people seem either too lazy to do that or either do not know what the RT-safeness guidelines are. I never understood it ... it is much more complex to desing a synthesis algorithm, etc than just avoiding a few mutexes and use a lockfree-fifo instead etc. Anyway I agree it would be cool to have page on the LAD site that explain all these issues and provide source for some basic routines and classes. This would prevent that the mistakes are made all over again. cheers, Benno http://linuxsampler.sourceforge.net ------------------------------------------------- This mail sent through http://www.gardena.net

22 years

[linux-audio-dev] [german] Keyboards Leserbrief zum Thema Linux und Audio

by Uwe Koloska

Hallo, hat jemand von euch in der aktuellen Keyboards die Antwort von Herrn Hain auf die Leseranfrage zu Linux und Audio gelesen? Die strotzt ja nur so von Unwissen, das schier danach schreit eines besseren belehrt zu werden. Vielleicht könnten wir ja gemeinsam eine Antwort erarbeiten. Bei Interesse könnte ich heute abend auch den Text von Frage und Antwort hier posten (leider gibt's die Leserbriefe nicht auf der Keyboards Webseite). So long Uwe -- voiceINTERconnect www.voiceinterconnect.de ... smart speech applications from germany

22 years

Re: [linux-audio-dev] Pair of Audiophile 24/96s?

by jeff wade

I too have a pair of Midiman 24/96's, and they sound great. I've been toying with .asoundrc (I've read the RME Hammerfall config and the TwoCardsAsOne page too), and so far I dont have what I want. I looking for both cards to function in sync, as a four (or eight?) - track recording platform. Can someone point me in the right direction with my .asoundrc file, and jackd options? how do i ensure the cards are synched?

22 years

[linux-audio-dev] CONFIDENCIAL REQUEST

by johnny.mboma1＠caramail.com

Dear Sir, I need your help,I am John Mboma the son of a Late minister during the reign of mobutu seseko, I came to know you in the course of my search for a reliable and God fearing partner and I decide to contact you because I believe you are a reputable person and I felt you can help us over this confidential matter. I count on your intergrity and honesty to be able to handle this business. My father was a minister in Democratic Republic of Congo during the reign of Late President Mobutu. Our father was killed during the rebel attack and our house was burnt. We manage to escape to South Africa with my mother and two of my sisters where we are now taking refuge.Before the death of my father he deposited US$30.5 MILLION, with a security company in Europe.The money is kept in a trunk boxes and was registered as precious substance. Thus there is nobody that knows that it is money that is in the box. All the document with which the money was deposited is with us. I am looking for somebody to that is capable and willing to travel to Europe Country to receive the two trunk boxes of money on behalf of my family from the security company. We need a trust worthy and experience person that will help us to invest this money in your country and take us as one family and will also buy a house for us over there where we can live safely. We are expecting to hear from you.Please contact me on this Email Address: johnmboma(a)uymail.com Thanks for your anticipated and cooperation.please include your telephone number and fax number in your reply Best Regards, John Mboma.

22 years

[linux-audio-dev] CLAIM YOUR LUCKY WINNING...

by EL GORDO SWEEPSTAKE LOTTERY COMPANY S.L

EL GORDO SWEEPSTAKE LOTTERY COMPANY S.L PLAZA COLONE-28080 MADRID-SPAIN. FROM: THE DESK OF THE MANAGING DIRECTOR INTERNATIONAL PROMOTIONS/PRICE AWARD DEPARTMENT. REF N�: EGSL/25003127/CSL/02 BATCH N�: 0007571982 DEAR FRIEND, RE: AWARD NOTIFICATION/ FINAL NOTICE. We are pleased to inform you of the release of the results EL GORDO SPANISH SWEEPSTAKE LOTTERY/ INTERNATIONAL PROGRAM, Held 12THJuly 2003. Your name attached to a ticket number 025-1146992-750 with serial number 2113-05 drew the lucky numbers 4-18-24-30-31-35 which consequently won the lottery in the 3rd category. You have therefore been approved for a lump sum payout of 625,000.39 (Six hundred and twenty five thousand dollars and thirty-nine cents) in cash credited to the file reference number: EGSL/25003127/CSL/02. This is the from a total cash price of 5,368,770.00 (Five million three hundred and sixty-eight thousand, seven hundred and seventy dollars only) shared among the seventeen international winners in this category. CONGRATULATIONS!!! Your fund is now deposited with a Trust and Security Company insured to your name. We advice that you keep this award from public notice until your claiming or unwarranted taking advantage of this program by participants. All participants were selected through a computer ballot system drawn from 25,000 names from Asia, Africa, Australia, Canada, U.S.A. ,New Zealand, Europe and North America as part of our international promotions program which we conduct once every year. We hope that with part of your prize, you will part-take in our end of year high stake $1,300,000,000.00 international lottery. To begin your claim please contact your claim agent, Mr. William Lopez, foreign services manager, payment and release order department, Tel: +34 696 023 002, OR via Email: superstandard(a)terra.es for processing and remittance of your prize fund into your designated bank account. Note: All prize funds must be claimed before the end of September 2003 after this date all funds will be returned to the MINISTERIO DE ECONOMIA Y HACIENDA as unclaimed. In order to avoid unnecessary delays and complications, please endeavour to quote your reference and batch numbers in every correspondence with us to your claim agent. Furthermore, should there be any change in your address do inform your claim agent as soon as possible. Congratulation once again from all members of our staff and thank you for being part of our promotion program. N.B. Any breach of confidentiality on the part of the winners will result to disqualification. Please do not reply to this email address. Contact your claim agent. Best regards The Management.

22 years

[linux-audio-dev] FOR YOUR ATTENTION, PLEASE !

by Mr.Michael Makeh

From; Mr. Michael Makeh, Banque Financiere De L'Afrique, Lome-Togo. My dear, I wish this my proposal will not come to you as a surprise. I am Mr. Michael Makeh, with Banque Financier De L'Afrique with regional office in Lome-Togo. We had a foreign client (Mohamed Hussein Hanadi ), who deposited the sum of US$7.8 million (Seven Million Eight Hundred Thousand United States Dollars) with our bank. Unfortunately,this client was among the victims of EGYPTAIR FLIGHT NO.990 that crashed on the 31-10-1999 in the atlantic ocean, U.S.A. Confirmable from the website; ( www.cnn.com/us/9911/02/egyptair990.list/index.html ). But, since that year after the death of our client, we have not had anybody that comes for the claims of this money as the next of kin to our client. A situation I have monitored closely with my position in our bank. Now, having monitored this deposit and managed it over the years before and after his death, and hence nobody has showed up as the next of kin for the past years now, I have removed the file to my "private vault". I now humbly solicit for your assistance in this issue. I wish to present you as the next of kin to this our client so as to claim out this money, before it is remmited into the fedral account where other people may aswell claim it directly without going to this lenght. I have taken every necessary precautionary measures concerning this issue and arrangement has been concluded by me in achieving this goal, provided you will follow my instructions in the process. I am only waiting for your response to enable me move the funds to your agreed safe account. This does not have any risk attached to it as all the internal documentations would be handled by me and every loop holes sealed also provided you give me your assistance and support. I therefore request you to confirm your interest by a return message and I will furnish you with the full details and what to do concerning this deal. What you stand to gain would be discussed and it is negotiable before the deal commences. Thank you in anticipation of your urgent response to my request stating your wish in this deal. Kind regards, Mr. Michael Makeh.

22 years

[linux-audio-dev] ZynAddSubFX 1.4.3 released

by Nasca Paul

Hi. I released ZynAddSubFX 1.4.3 at http://zynaddsubfx.sourceforge.net ZynAddSubFX is a free software synthsizer with many features. Paul. __________________________________ Do you Yahoo!? Yahoo! SiteBuilder - Free, easy-to-use web site design software http://sitebuilder.yahoo.com

22 years

[linux-audio-dev] Audio CODECs compared

by Jussi Laako

I have done some testing on different audio codecs with different settings. Results are available at http://www.sonarnerd.net/projects/wavcomp/ More tests to come... Any comments on testing procedure are welcome. Is someone able to put test .wav through ATRAC (back-and-forth)? I'd like to include it in test results. -- Jussi Laako <jussi.laako(a)pp.inet.fi>

22 years

[linux-audio-dev] ecasound 2.3.0 released

by Kai Vehmanen

1. A short summary of changes A set of severe bugs in audio mixing code have been fixed. Pyecasound build process has been improved. Reporting chainsetup parsing errors has been improved significantly. Support for the JACK 0.80 transport interface has been added. Support for reading and writing aiff, snd and au files has been fixed. Changes have been made to ensure correct operation with the NPTL package recently added to Linux kernel and glibc. A serious bug in metronome timing was fixed. Minor bugs in dynamic sample rate changes, MIDI-server initialization and the ewf file format have been fixed. --- 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 licensed under the LGPL. --- 3. Changes since last release * Support for JACK 0.80 transport interface. The recently released JACK 0.80.0 marks another milestone for Linux audio development. The new transport interface allows concurrent use of multiple independent audio applications with full sample-accurate transport synchronization. This release of Ecasound provides full support for the new transport API. See the following links to ecasound-list postings that give examples of how to use Ecasound with the new transport API: http://eca.cx/ecasound-list/2003/08/0005.html http://eca.cx/ecasound-list/2003/08/0070.html * Metronome timing bug. There was a subtle bug in the pulse gate operator that is used to generate the metronome signal. This bug caused a small (<0.5%) timing error in metronome speed. The bug has been fixed, but the change in speed might cause problems for working with sessions recorded with previous versions of Ecasound. Thanks to Carsten Bauer for finding the bug. Full list of changes is available at <http://www.wakkanet.fi/~kaiv/ecasound/history.html>. --- 4. Interface and configuration file changes Libecasound interface version number was incremented to 11. This release is backwards compatible with interface versions 9 and 10. See 'ecasound/libecasound/ChangeLog' for a detailed list of changes. Libkvutils interface version number was incremented to 6. This release is backwards compatible with versions 5 and 4. See 'ecasound/kvutils/ChangeLog' for a detailed list of changes. Note! Using libecasound and libkvutils outside Ecasound has been discouraged since the release of 2.2.0 in Jan 2003. The interface changes introduced in this 2.3.0 release should only affect a small group of distributors and developers. Apps such as Ecamegapedal need to be recompiled only if you want to take advantage of the new features introduced in the latest Ecasound release. --- 5. Contributors Patches - Accepted code, documentation and build system changes Kai Vehmanen (various) Bug Hunting - Reports that led to bugfixes (items closed) Jeremy Hall (3) -- non-default chainsetup srates, mixdown signal leak bug, pyecasound install Junichi Uekawa (3) -- non-default chainsetup srates, pyecasound install, gcc-3.3 verification Janne Halttunen (2) -- locale-settings broke map-* commands, MIDI-server startup bug Vegard Lima (2) -- feedback bug, ewf srate bug Carsten Bauer (1) -- timing bug in metronome and pulse gate Ismail Donmez (1) -- build errors with sys-readline option Lars Henrik Mai (1) -- aiff/au/snd bug Stephan Niemz (1) -- non-default chainsetup srates Al Oemens (1) -- reporting chainsetup parsing errors Oliver Thuns (1) -- -ei big shift-x values Tommi Uimonen (1) -- problems with ecasignalview channel meter layout --- 6. Links and files Web sites: http://www.eca.cx http://www.eca.cx/ecasound Source packages: http://ecasound.seul.org/download http://ecasound.seul.org/download/ecasound-2.3.0.tar.gz Distributions with maintained Ecasound support: Agnula - http://www.agnula.org Debian - 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/software SuSE Linux - http://www.suse.de/en Contrib Packages for Distributions: Mandrake - http://rpm.nyvalls.se/ Slackware - http://www.audioslack.com Various distros - http://apps.kde.com/rf/2/info/id/2146 Note! Distributors do not necessarily provide packages for the very latest Ecasound version. -- http://www.eca.cx Audio software for Linux!

22 years

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Linux-audio-dev