Linux-audio-user October 2008

linux-audio-user@lists.linuxaudio.org

125 participants
97 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

RME RayDAT and linux?

by Giso Grimm

Hi, does anybody know whether the RME Raydat interface card is linux compatible? Does it use the hdsp driver? Giso

15 years, 8 months

Command Line Beat Slicing

by Dan Richert

Does anyone know of a command line app for beat slicing?

15 years, 10 months

Ubuntu Hard real time kernel (2.6.24-21) poor performance.

by John Tomlinson

After a number of years of making successful music recordings using a combination of rosegarden and ardour on my Ubuntu Dapper Drake system, and my home grown real-time kernels, I thought it was time to upgrade to Hardy Heron and use the proper real time kernel that the experts had built. What a disappointment! I have an internal pci sound blaster live card (emu10k1 chip set) and a M-audio audiophile USB sound module. On my dapper installation, which happened to have 2.6.22.1 real time patched kernel (the default ubuntu kernel was 2.6.15), I could get latencies as low as 1.5ms (32 frames/period) on the sound blaster and 2.7ms ( 64 frames/period) on the USB Audiophile with very few xruns; so few xruns that I used to wonder why people posted to mailing lists/forums about the problem. With the stock Ubuntu 2.6.24-21rt kernel the sound blaster gives xruns every few seconds with no load (no recording and no playing back) at 23ms latency (512 frames/period) and the Audiophile struggles at 43ms ( 1024 frames/period); I am getting xruns every 10-20 seconds. Infact the rt kernel gives little, if any, improvement over the generic kernel. I have the following settings in my limits.conf @audio - rtprio 95 @audio - memlock 512000 @audio - nice -19 And I have a script to set the real-time priorities for the interrupts for the interrupts that the sound system use - usually IRQ17 and IRQ19. My user is also a member of the audio group. I have tried the nohz=no on the kernel start up command line as discussed in numerous fora with no change. I did not expect one: johnt@TOMO001:/boot$ grep NO_HZ config-2.6.24-21-* config-2.6.24-21-generic:CONFIG_NO_HZ=y config-2.6.24-21-rt:# CONFIG_NO_HZ is not set I have also tried the changes described in: http://alsa.opensrc.org/index.php/Usb-audio which also made no difference. Any ideas what to try next? Have I got to go back and start build my own kernels again (which always involved a battle between me and the nvidia graphics card)? John Tomlinson

15 years, 11 months

Looking for a mixer, 16+ channels

by hollunder＠gmx.at

Hi guys (and gals), a good friend of mine is in the market for a mixer that is at least capable of recording a whole band simultaneously. He thinks that 16 channels might be a minimum for that, but he isn't exactly experienced, and me neither. It would be nice if it would work as firewire audio interface as well, like the mackie onyx mixers, mainly because it might mean less trouble overall. Those onyx mixers look nice, and are supported by ffado, but we'd like to have some more options. Linux support isn't a strict requirement but it would be really nice to have as option. So far it didn't work for him, but when the hardware works with linux I can show him what's there and what's new from time to time. In this case he has a budget of up to 3000 Euros or possibly more, but the stuff really needs to work for a studio. Thanks in advance for any advice, best regards Philipp

15 years, 11 months

soundmodule for my fatar

by Grammostola Rosea

Hi, I;ve an fatar sl 880 and I'm searching now for a piano soundmodule so I don't have to use my Linux box for playing piano always. What are good soundmodules with a acceptable piano sound? Thanks in advance,

16 years

Re: [LAU] Intel-HDA sound issues

by Matthew Smith

Quoth I: >> Whilst it is possible that someone out there may have this working >> with Jack (and a realtime kernel), I have yet to meet them. Quoth Ronald Stewart at 2008-10-22 07:49... > we got it working, you need good ol' 64studio RT.. There you go - so it can be done. Thanks Ron. Think I'll stick to my external card though - better connectors, headphone monitor, etc. (And hooked directly into a Soundcraft Compact 10 mixer.) One day I might actually get the time to use all this - haven't even had the chance build myself a non-crashing Rosegarden yet :-( Cheers M -- Matthew Smith Smiffytech - Technology Consulting & Web Application Development Business: http://www.smiffytech.com/ Personal: http://www.smiffysplace.com/ LinkedIn: http://www.linkedin.com/in/smiffy

16 years

[OT] first computer ?

by Dave Phillips

Greetings, For no reason beyond boredom I decided to pester this list with an OT topic or two. So, without further delay: What was your first computer ? And for extra points: What was the first music/sound software you used that really hooked you into this making-music-with-computers fad ? You may fire when ready. Best, dp

16 years

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Linux-audio-user October 2008