Linux-audio-dev

linux-audio-dev@lists.linuxaudio.org

7516 discussions

by Juhana Sadeharju

Hello. I have problems in getting a shared memory to work. What works is my shmalloc() which is used for sharing memory over fork(). What does not work is sharing memory between arbitrary processes. This latter uses ftok() with a pathname (e.g., "/tmp/globalshm") in identifying the shared memory. Each process uses the pathname for gaining access to the shared memory. The simple example in "http://www.funet.fi/~kouhia/shmserver.tar.gz" does not work. It looks like shmserver creates the shared memory, but shmclient cannot find it. I use now shmget() but I have also used mmap() for shared memory. I don't remember the reason why I moved from mmap() to shmget(). Were there any limitations? What then is the "/dev/shm" seen in the "df" listing? How that is used? Best regards, Juhana

22 years, 4 months

[linux-audio-dev] LAD at the LinuxTag 2003 in Karlsruhe, Germany

by Frank Neumann

Hello everyone, next week, on July 10th - 13th, the LinuxTag, Europe's largest GNU/Linux exhibition and congress, takes place again in Karlsruhe, Germany, and once again several LAD "members" will be there with a booth to demonstrate what some of you/us have developed in the past :-). I'd like to invite anyone to come along, say hello and have some tech babble with us :-). We, that is: - Jörn Nettingsmeier, your faithful mailing list adminstrator - Julien Patrick Claassen, showing text-mode applications (Ecasound, Csound etc) - Matthias Nagorni of SuSE, author of AlsaModularSynth, KAConnect and other tools and docs - Takashi Iwai, one of the main authors of ALSA - Josh Green from California, developer of the Swami soundfont editor (once called Smurf) - Conrad Parker from Australia, author of the Sweep sound editor - he will also have a presentation of Sweep during the public congress. - and yours truly. Also, some developers of the Glame editor (Richard Guenther, Alexander Ehlert, Daniel Kobras) will be there (probably on Saturday/Sunday), and also Werner Schweer, author of the MusE MIDI sequencer, will be there at least one day on the weekend. As in the last 2 years, our main focus will be to bring some of the really great sound apps to public attention, help with install problems, spread information on ALSA and Jack, exchange knowledge amongst ourselves, and of course also to have a good time - with a little chance to actually make some music :-). But even if you'd not visit our booth (shame on you!), the LinuxTag is a great place to be. _IF_ you plan to come and don't want to spend a few Euros on the entrance fee (yes, it's not completely free anymore since last year), be smart and register at the LinuxTag's homepage which will result in a PDF generated for you that you print out and take with out as entrance ticket. It's even under the GPL :-). Weird concept, I know, but the idea is not that stupid after all - at least this keeps some of the kiddies away (those who visited former LinuxTag events know what I mean). For any and all information regarding the place, travel, accomodation and so on, please visit http://www.linuxtag.org. Unfortunately, the booth planning is not finished yet, so I cannot say right now what our booth number will be - but it shouldn't be hard to find. Officially on the exhibitor list, we are named "Linux Audio". Hope to see you there, Frank

22 years, 4 months

[linux-audio-dev] Using 'fastaudio', the python wrapper to PortAudio

by Frederic

Hello, (I'm not sure if this is the right list to post this question. Please let me know if I should use the user list instead). I made a C program using PortAudio, and I would like to re-write it in python, using the wrapper fastaudio. There is a little example in the fastaudio package, but not enough to understand how to use the callback function. Does anybody has a more complex example, using callback ? Regards, -- Frederic http://linux.gbiloba.org

22 years, 4 months

[linux-audio-dev] pros/cons of poll vs. asynch notify in ALSA

by jacob robbins

Anybody have any opinions on whether it is better to use polling or asynchronous notification when using the ALSA lib? i'm fishing for advantages re: speed, robustness, portability, etc -jacob robbins.....

22 years, 4 months

[linux-audio-dev] RTP MIDI update ...

by John Lazzaro

Hi everyone, Just sent in an updated version of the RTP MIDI normative I-D off to internet-drafts(a)ietf.org. You can download a copy now from: http://www.cs.berkeley.edu/~lazzaro/sa/pubs/txt/current-rtp-midi.txt In a hopeful sign, the Change Log is sufficiently short to reproduce in full below: Chapter M (Appendix A.9) has been redesigned, to follow the semantic design of Chapters C and E. Several definitions in Appendix A.1 have been changed to reflect this change, as have the chapter inclusion semantics for Chapter M in Appendix C.1.3. Many small editorial changes throughout the document, to correct grammatical errors and improve phrasing. I'm actually starting to re-code sfront networking to be compliant with the I-D (it has fallen out of date since the AVT RTP MIDI effort began), in the hopes of gcc catching bugs that peer-review may miss. Once that coding is complete, "Last Call" is probably not too far away ... so if you've been planning to spend a few hours to reading over the I-D and sending along comments, now would be a good time to do it. You might also want to download the non-normative Implementation Guide for RTP MIDI: http://www.cs.berkeley.edu/~lazzaro/sa/pubs/txt/current-guide.txt ------------------------------------------------------------------------- John Lazzaro -- Research Specialist -- CS Division -- EECS -- UC Berkeley lazzaro [at] cs [dot] berkeley [dot] edu www.cs.berkeley.edu/~lazzaro -------------------------------------------------------------------------

22 years, 4 months

[linux-audio-dev] Re: |||| Gain/Peak indicator

by Andrew Burgess

>Also for sound limiter (compressor) algorithms . Sox has a compander and there is also a Dyson compressor LADSPA plugin. http://sox.sourceforge.net/ http://plugin.org.uk/faq.php

22 years, 4 months

[linux-audio-dev] |||| Gain/Peak indicator

by Ralfs Kurmis

Hi to developers I'm search for realtime sound and peak gain indicator (db) algorithms and formulas. My first idea is all 16 bit absolute sound_sample_values in time interval t1...t2 compare with ethalon sine wave ( where ethalon sine wave amplitude is 32000 and lenght/2 is t2-t1 ) Also for sound limiter (compressor) algorithms . i'm newbie in sound/dsp programming any help welcomed tnx in advance RalfsK --- This message contains no viruses. Guaranteed by Kaspersky Anti-Virus. www.antivirus.lv

22 years, 4 months

[linux-audio-dev] Glame 1.0.1 released.

by Richard Guenther

Glame 1.0.1 was released moments ago. This release features mp3 and ogg importing support which was backported from mainline. Also minor bugs were fixed and LADSPA v1.1 hints are now honoured. Downloads are from the usual SF.net location http://prdownloads.sourceforge.net/glame/glame-1.0.1.tar.gz?download Have fun! Richard.

22 years, 4 months

[linux-audio-dev] ANNOUNCE: Ardour 0.9beta1 Slackware 9.0 packages available

by Luke Yelavich

Hi all With the release of Ardour 0.9beta1 on Sourceforge at http://sourceforge.net/projects/ardour, Slackware 9.0 packages are now available for immediate download. Download links, as well as md5sums, can be found at http://www.audioslack.com/packages/ardour. It is also worth noting that http://www.audioslack.com will hopefully become a repository of binary packages of Audio software to be used on the Slackware Linux Distribution. Please check out the site if you are interested in helping out. Your help would be much appreciated. Please feel free to contact me if you have any site suggestions, or have any problems with the packages on the site. I don't offer specific package help, but am willing to lend a hand with the installation and configuration of packages posted there. Regards Luke ---------------- Luke Yelavich AudioSlack Founder and main package maintainer Audio software packaged for the Slackware Linux Distribution http://www.audioslack.com luke(a)audioslack.com

22 years, 4 months

[linux-audio-dev] Digital Room Correction (DRC) 2.2.0

by Denis Sbragion

Hi all, fro those interested DRC 2.2.0 is available at: http://freshmeat.net/projects/drc/ This new release provides slighlty better correction accuracy. Fro the details see the FM announcement at: http://freshmeat.net/releases/127182/ Bye, -- Denis Sbragion InfoTecna Tel: +39 0362 805396, Fax: +39 0362 805404 URL: http://www.infotecna.it

22 years, 4 months

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Linux-audio-dev