Linux-audio-dev

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5 participants
7515 discussions

[linux-audio-dev] [AN] QLoud-0.1 - measuring loudspeaker response

by Andrew Gaydenko

Hi! I have wrote this app for own audio-DIY use. Probably, somebody else will find the app useful too. I'll be happy in such case :-) Source: http://gaydenko.com/qloud/qloud-0.1.tar.bz2 Screenshot (180KB): http://gaydenko.com/qloud/shot01.png ===== README ====== QLoud is a tool to measure a loudspeaker frequency response. Writing this app is inspired by excellent applications written by Fons Adriaensen: http://users.skynet.be/solaris/linuxaudio/ Theoretical background belongs to Angelo Farina: http://pcfarina.eng.unipr.it/ In particular, this method was used: http://pcfarina.eng.unipr.it/Public/Papers/134-AES00.PDF Few hints: - move mouse above "?" sign at plot window and wait, - to delete measurement, use context menu on mesurements table, - to see what the app do, just connect app's JACK ports and try, - to see what your sound card do, use loopback for line in/out, - using "very smooth" fractional octave smoothing is hungry for CPU. So be patient when select more rather 1/3 octave smoothing (1/3 octave and less smoothing is rather interactive). Feedback: Please, add "QLoud" to your message subject. My email is: a(a)gaydenko.com ===== INSTALL ===== Requirements: - QT4 ( http://trolltech.com/ ), I use 4.1.4 version, - Qwt ( http://qwt.sourceforge.net/ ) from current CVS tree (probably, last official CVS qwt5 snapshot will work too), - JACK ( http://jackaudio.org/ ), - sndfile ( http://www.mega-nerd.com/libsndfile/ ), - fftw ( http://www.fftw.org/ ). Installation: - look in src/src.pro to modify include dirs if you want, - run qmake make 'qloud' excecutable will be in 'bin' directory.

19 years, 2 months

[linux-audio-dev] Are people still writing LADSPA plug-ins?

by Jono Bacon

Hi all, I don't mean this to be a pointed question, but from looking at the swh, TAP and CMT plug-in sites, there doesn't seem to be many recent updates of LADSPA plug-ins, and I have not seen many people releasing and announcing new plug-ins. Are people writing new plug-ins, and are existing plug-ins getting refined and released? It would awesome if there was a central site, akin to Firefox's Extension Room site, for the different plug-ins that are available. Jono

19 years, 2 months

[linux-audio-dev] Help needed: mpg123 lives!

by Nicholas J Humfrey

Hi, Thomas Orgis and myself have been doing some work on mpg123 and have started a website and Subversion repository: http://mpg123.orgis.org/ We have been rolling various patches into the new official code-base. We have gained permission from Michael Hipp and all the contributors to mpg123 to make all of the code LGPL licensed. New features: - autoconf/automake based build system - support for more output methods (liboa, JACK, SDL, PortAudio, CoreAudio) - more assembler optimizations (MMX, AltiVec, ...) - new equalizer code - experimental gapless playback We are working towards a 0.60 stable version. After that version we will be looking at more major changes to the code structure. I have been trying to add ALSA 0.9/1.0 API support - but have been having a few problems - is anyone able to help out? Thanks, nick.

19 years, 2 months

[linux-audio-dev] Re: Akai's MPC4000 Sampler/Workstation Open Source Project

by Juhana Sadeharju

>From: Renich Bon ?iri? <renich(a)woralelandia.com> > And what you wanted to say? The mail had no content. Juhana -- http://music.columbia.edu/mailman/listinfo/linux-graphics-dev for developers of open source graphics software

19 years, 2 months

[linux-audio-dev] C++ wrapper for libsndfile

by Erik de Castro Lopo

Hi all, Thanks to suggestions from people here I now have a relatively complete C++ wrapper for libsndfile: http://www.mega-nerd.com/tmp/sndfile.hh There is also a pre-release of libsndfile which includes a test for this wrapper: http://www.mega-nerd.com/tmp/libsndfile-1.0.17pre7.tar.gz C++ users, please comment. Cheers, Erik -- +-----------------------------------------------------------+ Erik de Castro Lopo +-----------------------------------------------------------+ "Even among Europe's Muslim minorities, roughly one-in-seven in France, Spain, and Great Britain feel that suicide bombings against civilian targets can at least sometimes be justified to defend Islam against its enemies." -- http://pewglobal.org/reports/display.php?ReportID=253

19 years, 2 months

[linux-audio-dev] [ANN] das_watchdog V0.2.4 and jack_capture V0.3.7

by kjetil＠ccrma.stanford.edu

New source location: http://www.notam02.no/~kjetism/src/ (Sorry, I have temporarily lost access to both my previously used upload directories) das_watchdog ************************************************************************* Whenever a program locks up the machine, das_watchdog will temporarily sets all realtime process to non-realtime for 8 seconds. You will get an xmessage window up on the screen whenever that happens. Changes 0.2.3->0.2.4 -------------------- *Test if the xmessage program found during the make process is a valid executable. If not, search the $PATH instead. This should fix it for Gentoo when the pro-audio overlay is updated to at least this version. *Various modifications for the High Res Timer, which should be used instead of setting the timer interrupt process to SCHED_FIFO/99. jack_capture ************************************************************************* jack_capture is a small program to capture whatever sound is going out to your speakers into a file without having to patch jack connections, fiddle around with fileformats, or set options on the argument line. This is the program I always wanted to have for jack, but no one made. So here it is. Changes 0.3.1 -> 0.3.7: ----------------------- *Fixed potentional buffer underrun error. *Fixed potentional ringbuffer size allocation miscalculation. *Better way to set leading zeros in filename. Thanks to Melanie. *Better underrun handling. Thanks to Dmitry Baikov. *Added support for jack buffer size change. *Removed some unnecessary code and comments *Beautified code a bit. *Fixed a bug in the reconnection code. *Beautified code a lot. *Changed bufsize argument to accept seconds instead of frames. Default buffer size is 60 seconds. *Improved documentation and help option. *Beautified source a bit. *Fixed bug in ringbuffer size allocation. *Fixed so that more than one instance of jack_capture can run at once.

19 years, 2 months

[linux-audio-dev] light C++ set for WAV

by Andrew Gaydenko

I mean some minimal C++ class set like: WavFile, WavHeader, WavFrame with few apparent methods (open/close, read/write frame(s)). Suggestions?

19 years, 2 months

[linux-audio-dev] Popular LADSPA plug-ins to depend on?

by Jono Bacon

Hi all, I am working on LADSPA support in Jokosher and we want Jokosher to depend on particular plug-ins in different parts of the application. Specifically, I would like to see a powerful compressor and equalizer as part of the application. So, my question to you all is which compressor and equalizer do we depend on? Importantly, the chosen plug-ins need to exhibit the following qualities: * packages for all major distributions (Ubuntu, Debian, Red Hat, Fedora, Gentoo, SuSE etc.) * well maintained * very high quality audio quality Cheers, Jono

19 years, 2 months

[linux-audio-dev] Basic MIDI question

by Lee Revell

I've never been a MIDI expert but I'm now having to learn. I have a question about this excerpt of a MIDI file viewed with hexedit. 00001BB0 22 80 3D 35 31 80 3A 39 0E 80 37 31 03 80 31 1F ".=51.:9..71..1. 00001BC0 81 0C 90 30 5B 00 90 3C 79 81 70 90 39 73 00 90 ...0[..<y.p.9s.. 00001BD0 36 69 4B 80 36 43 0A 80 3C 26 01 80 30 44 0A 80 6iK.6C..<&..0D.. 00001BE0 39 42 82 08 90 37 63 00 90 43 7B 81 70 90 3E 5E 9B...7c..C{.p.>^ 00001BF0 00 90 3A 66 08 80 37 30 02 80 43 32 31 80 3E 11 ..:f..70..C21.> Take the sequence "80 3D 35 31 80 3A 39 0E 80 37 31 03 80 31 1F" in the first line for example. I know that 0x80 is note-off, and 0x3D are note number and 0x35 the velocity of the note-off. But what the heck is the next byte, 0x31? The MIDI standard says note-off is one status byte followed by 2 data bytes! Lee

19 years, 2 months

[linux-audio-dev] Open MPC OS Initiative

by Renich Bon Ćirić

If anyone would like to join the OpenMPC OS dev team, welcome. http://www.woralelandia.com/openmpc/blog/

19 years, 2 months

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Linux-audio-dev