Linux-audio-user January 2011

linux-audio-user@lists.linuxaudio.org

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[lists@smassy.andropov.org: Re: Simple loop playing from command line]

by S. Massy

I inadvertently replied directly to the OP, rather than to the list. See below. Cheers, S.M.

14 years, 11 months

Testing

by S. Massy

Testing to see if posts get through. Please disregard.

14 years, 11 months

Realtime latency kernel testing

by ailo

I've been looking around for any tests made comparing the different kernels, -rt, generic, or any other type of realtime enchanced kernel. I haven't found any test results yet, at least none audio related. I did find some testing tools at rt.wiki.kernel.org, but don't know if and how they could be made relevant to audio low latency testing. I suppose the most interesting results would come from testing different kernels with jack/alsa and jack/ffado. Has anyone done such tests? -- ailo

14 years, 11 months

rt kernel in debian/squeeze

by Atte André Jensen

Hi As a protest against the (now taken back) news of plans of rolling upgrades in ubuntu I installed debian. It's been a long time and last time I rolled my own kernel, but I'm wondering if theres an easier solution these days? And while we're at it, what do you guys running squeeze have in your sources.list? -- Atte http://atte.dk http://modlys.dk

14 years, 11 months

Fluidsynth shift an octave down

by Ken Restivo

Is there a way in fluidsynth to shift a whole soundfont up or down an octave? Or would I have to edit the soundfont in Swami and permanently move the notes around? -ken

14 years, 11 months

New release of zita-at1

by fons＠kokkinizita.net

An update of zita-at1 is available at the usual place: <http://www.kokkinizita.net/linuxaudio/downloads>. Changes: * The resampler now uses cubic interpolation (at twice the sample rate for 44.1 and 48 kHz), giving even cleaner output. * The offset control now has 400 steps of exactly 1 cent (1/100 semitone) each, and displays the set value when touched. Default mousewheel step is 10 cents, 1 cent with Shift pressed. Enjoy ! -- FA There are three of them, and Alleline.

14 years, 11 months

Simple loop playing from command line

by Ken Restivo

I'm trying to figure out a way to play a simple loop from the command line. It doesn't need to be synchronized with anything (our drummer will be talking over it). I found this archive: http://comments.gmane.org/gmane.comp.audio.ecasound.general/3843 But there seems to be no "audioloop" in ecasound (I have 2.4.6.1-2 ). The man page I have on my system mentions "-tl", so I tried that, and it zombified jack (not good). Here is what I tried; $ ecasound -f:f32_le,2,48000 -t:3600 -a:1 -i:audioloop,johnloop48.wav -a:all -o jack_auto does nothing, just tells me three tims that it is using realtime-scheduling: - [ Engine init - Driver start ] (eca-engine) Using realtime-scheduling (SCHED_FIFO:50). (eca-engine) Using realtime-scheduling (SCHED_FIFO:50). (eca-engine) Using realtime-scheduling (SCHED_FIFO:50). Hmm. Goole says try "notransport". So I do. $ ecasound -f:f32_le,2,48000 -G:jack,ecasound,notransport -tl -a:1 -i:audioloop,johnloop48.wav -a:all -o jack_auto does nothing, just goes: - [ Engine init - Driver start ] (eca-engine) Using realtime-scheduling (SCHED_FIFO:50). and then hangs, but at least that tells me only once that it's realtime-scheduling OK, how about doing what the docs say? $ ecasound -f:f32_le,2,48000 -G:jack,ecasound,notransport -tl -a:1 -i:johnloop48.wav -a:all -o jack_auto plays the loop once, then zombifies (eca-engine) Using realtime-scheduling (SCHED_FIFO:50). zombified - calling shutdown handler (eca-engine) WARNING: Engine has raised an error! Possible causes: connection ... lost to system services, unable to adapt to changes in operating environment, etc. - [ Controller/Batch processing finished (-3) ] -------------------------------- ecasound: Warning! Errors detected during processing. (eca-control-objects) Disconnecting chainsetup: "command-line-setup". At least I got sound out of it though. Are there any other command-line tools I could use to loop a wav file, possibly simpler and less weird than ecasound? I guess I could write one, just read the bytes out of a wav file in a loop, and dump it into the jack process callback, wouldn't be too hard. But if something already exists, then I'd rather use that. Thanks! -ken

14 years, 11 months

Linux Audio Conference 2011: Paper submission deadline extended

by Frank Neumann

Dear all, for the Linux Audio Conference 2011(*) in Maynooth, Ireland, we have extended the deadline for paper submissions to February 20th, 2011. So, if you have considered handing in a paper but couldn't make up your mind yet, here is your chance to become active! Never forget that this conference lives through the people participating in it. The deadline for music submissions has been set to the same date. Notification of acceptance of submitted papers has been aligned slightly as well, and will be sent out on March 15th, 2011. (*) http://lac.linuxaudio.org/2011 Please spread this information to anyone who might be interested. Direct any questions through email to lac(a)linuxaudio.org. Thanks, Frank

14 years, 11 months

IO scheduler for realtime audio?

by Jaromír Mikeš

Hi all, let's assume I have ssd disk, ext4 file system and latest RT kernel 2.6.33.7.2-30rt What is the best choice for IO scheduler for realtime audio? thanks for advice mira

14 years, 11 months

Cpu scaling on performance, permanent

by rosea.grammostola

Hi, I know you can make a script to set the cpu scaling on performance. But is there also a way to make this permanent on a Debian based distro (Ubuntu)? What is the best way to do this? Regards, \r

14 years, 11 months

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Linux-audio-user January 2011