Linux-audio-user April 2010

linux-audio-user@lists.linuxaudio.org

139 participants
124 discussions

Steinway_IMIS2.2 soundfont (no loops fix)

by Roberto Gordo Saez

This is Steinway_IMIS soundfont, version 2.2. ftp://musix.ourproject.org/pub/musix/sf2/Steinway_IMIS2.2 This version fixes the issue with loops. I hope this is the good one and there are no more remaining major bugs. Marcos is a little busy right now, so he asked me to make this fix. He is thinking to make other improvements, so expect more updates soon.

1 year, 7 months

[linux-audio-user] Sub-harmonic generator? (LADSPA or VST)

by Tim Howard

Hello, Does anyone know of a good plugin that will generate subharmonics? I would like to put a little more low frequency "oomph" into my bass track. Preferrable LADSPA, but VST would work, too. Thanks for any help! -TimH

8 years, 2 months

Re: [LAU] Simple, easy multithreaded circular buffer library for Linux?

by Kjetil S. Matheussen

Olivier Guilyardi: > > Ken Restivo wrote: >> It has been over 7 years since I last messed around with writing Pthreads applications. >> >> I recall it as a painful, ugly, brain-numbing task. I located an exercise I did back then to address the consumer/producer problem in Pthreads, and just the sight of it is giving me a headache. >> >> I'm being lazy, so instead of researching everything that's out there, I'll ask here: can anyone recommend a relatively simple and painless abstraction library (GPL or LGPL of course) that will give me functions to create a thread in which I can stuff things into a ring buffer, and another thread in which I can pull stuff out of it? >> >> By the way, I know that JACK has a very nice event buffer which is insanely easy to use (and I have), and makes multithreading almost transparent, but this isn't a JACK app. > > I don't know of any abstraction library, but creating/terminating a normal > thread with pthread is really an easy task IMO. It's about 10 lines in C. > > For inter-thread communication there's Portaudio's ring buffer: > http://portaudio.com/trac/browser/portaudio/trunk/src/common/pa_ringbuffer.h > > It can easily be used out of Portaudio (I'm currently doing that), and it > features memory barriers [1] which AFAIK Jack's ringbuffer doesn't. > > One problem with everything Portaudio is this heavy naming scheme. For a simpler > API, you might like my little wrapper: > http://jackbeat.samalyse.org/browser/jackbeat/trunk/src/core/ringbuffer.h > Nice. It's probably quicker to copy the jack_ringbuffer.c file out of jack though. > Portaudio actually also offers a callback mechanism (with hidden thread > creation), so if you're coding an non-JACK audio app, you might want to check it > out. > > For thread synchronization, semaphores (man semaphore.h) are really easy to use. > However, if you need a lock-free equivalent (for realtime, ...) phtread mutex > and especially pthread_mutex_trylock are your friends. > Those friends can be really cranky sometimes though. By using atomic operations instead, it's possible to avoid a lot of headache by not having to synchronize at all. Performance might be better too. Midishare has lockfree atomic functions for lifo and fifi queues: http://midishare.cvs.sourceforge.net/viewvc/midishare/midishare/src/common/…

12 years, 10 months

jackd in realtime as user: a no-go in spite of modifying limits.conf

by Der Mickster

Hey, Can't seem to start jackd in realtime as user on ubuntu studio. It does start as root, but that's hardly a consolation (unless I run all audio software as root, which would be kinda daft IMO) @audio - rtprio 99 @audio - nice -10 @audio - memlock unlimited have been added to /etc/security/limits.conf Nevertheless, starting it as user just doesn't seem to work, and I just can't figure out why. I've googled the issue, and everybody seems to agree that modifying limits.conf in the above manner should solve the problem - yet this is what I get: mick@kaizoku:~$ jackd -R -P89 -dalsa -dhw:0 -r48000 -p256 -n3 -S & [1] 3092 mick@kaizoku:~$ no message buffer overruns jackd 0.116.1 Copyright 2001-2005 Paul Davis and others. jackd comes with ABSOLUTELY NO WARRANTY This is free software, and you are welcome to redistribute it under certain conditions; see the file COPYING for details JACK compiled with System V SHM support. cannot use real-time scheduling (FIFO at priority 10) [for thread -1217255744, from thread -1217255744] (1: Operation not permitted) cannot create engine Any ideas? Mick.

13 years, 11 months

Connie, an organ template for JACK

by Martin Homuth-Rosemann

Hi, sorry, just realized that the hammond discussion mentioned below was here and not at LAD, so please allow this kind of "crosspost": this is my first post to LAD. The discussion about a hammond simulation "Fons could you make us...", Beatrix and some research for writing a (german) wikipedia article (stub) about the Vox Continental inspired me to hack a quick organ program that simulates the internal signal flow of the "Connie" with JACK MIDI input and JACK audio output. Have fun: http://cryptomys.de/horo/Connie/Connie-0.1.tar.gz Ciao Martin Homuth-Rosemann

14 years, 3 months

Re: [LAU] Need help salvaging a recording

by Shani Hadiyanto Pribadi

> Try using sndfile-convert (in the sndfile-programs package in > Debian/Ubuntu) to conver the file to a format which allows > files larger than 4G. Try: > > sndfile-convert large-file.wav large-file.w64 > > Let me know if that doesn't work. > > Erik > -- > ---------------------------------------------------------------------- > Erik de Castro Lopo > http://www.mega-nerd.com/ Nope, unfortunately it didn't work. Here's the output of sndfile-info on the wav and the resultant w64 http://pastebin.com/YzPdxrNg The resultant w64 length is only 20 minutes, just the same as the one that is able to be read from the wave file. What happens if a wav file has a size larger than 4G? Does it stop writing any audio data? Or the audio data is there, but can not be read because of the header length is insufficient? But why is the error start after only 20 minutes of audio, shouldn't it worked for the first 4G? I saved the recordings as wavex because I thought wavex support file size more than 4GiB. Speaking of file formats, do you have any recommendations for file format for recording? My choice is between w64, caf, or sun/next au. I heard au is more primitive, but is chunk-less, and that gives it some advantage over the others, though i don't understand what kind of advantage it has. w64 has more support in the windows world, which is what my friends using, but I can always bounce to a different format later. I'm not sure what caf has to offer though, I don't understand the technical terms. Here's a blog where I read it about http://blog.bjornroche.com/2009/11/wave64-vs-rf64-vs-caf.html

14 years, 5 months

yet another yoshimi bug fix, -> 0.021

by cal

Frank Kober wrote: > Hi there, > I just noticed that I'm not able to save sounds to my custom root bank directory, > and wondered if I did something wrong setting this up in my home. Also, when I > try to change the name of the current sound with a right click, the dialog opens > OK and lets me enter the patch name, but it won't keep it when I click OK. > Any idea? I thought about my bank dir file permissions, but they seem to be OK. > I'm not sure, but I think that this worked already with yoshimi. I cannot tell the > last version with which it did though... Right click instrument name change now works. For me, saving to a custom bank root seems ok, but some funkiness there wouldn't greatly surprise me. If it still doesn't satisfy, perhaps you can spell out the steps you're taking and from that I'll hopefully be able to figure out where it's going wrong. 0.021 fix right click instrument rename and a couple of bank management issues <http://www.graggrag.com/?q=yoshimi> cheers, Cal

14 years, 6 months

[ANN] Jackbeat 0.7.5

by Olivier Guilyardi

Hi everyone, The Jackbeat step sequencer version 0.7.5 has been released. Download it from: http://jackbeat.samalyse.org News ~~~~ A critical compatibility issue with gtk >= 2.19 has been fixed. ChangeLog ~~~~~~~~~ jackbeat (0.7.5) * #47: fix startup crash with gtk >= 2.19 caused by new GtkBuilder widget name handling Musically yours -- Olivier

14 years, 6 months

Re: [LAU] CDRDAO speed, CRC errors, blah

by Roberto

Oops, sorry, it was meant to be sent to the list :P ----- Forwarded message from Roberto <roberto(a)zenvoid.org> ----- Date: Sat, 24 Apr 2010 14:55:18 +0200 From: Roberto <roberto(a)zenvoid.org> To: Fons Adriaensen <fons(a)kokkinizita.net> Subject: Re: [LAU] CDRDAO speed, CRC errors, blah On Sat, Apr 24, 2010 at 02:07:48AM +0200, Fons Adriaensen wrote: > The limiting factor could well be the minimum power at which > the write laser can operate - lower write speed requires less > power. Hey, I found it! Is not the drive limits as I have used my drive to write at very low speeds in the past (not because better recordings but just to avoid annoying drive noise). It's medium limits: writable DVD and CD have a minimum write speed, and software will refuse to select slower speeds. Try this (with the blank medium loaded in the drive): for DVD: dvd+rw-mediainfo /dev/dvd1 for CD: wodim -prcap Ken, it is very likely that 8x is already the slowest that you can get with those CD, I'm afraid. ----- End forwarded message -----

14 years, 6 months

room accoustics and noise reduction

by rosea.grammostola

Hi, I play bassguitar and I am starting wit trumpet. Those things make noise... 1) What can I do for noise reduction? 2) what can I do for improving the room accoustics? Thanks in advance, \r

14 years, 6 months

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Linux-audio-user April 2010