Linux-audio-user December 2009

linux-audio-user@lists.linuxaudio.org

166 participants
190 discussions

by Josh Lawrence

hey list, I've been struggling for the past couple of weeks trying to get my netbook to perform well as a lightweight music workstation (mostly synth work, light daw stuff). I'm getting many, many xruns, clients getting kicked, etc. something is clearly not right. how do I begin tracking down the source of xruns? I have an -rt kernel, a usb sound card using -p256 -n3, running fluxbox with only wicd running to manage my network. point is, I've tried the hunt-and-peck method and (surprise) it hasn't done any good. how can I go about finding out what exactly is tripping jack up, and what I can do to stop it? (PS - I've said it before: maybe I'm expecting too much of a netbook. could that be it?) -- Josh Lawrence http://www.hardbop200.com

16 years, 1 month

[LAU] play/sox like command with jack output?

by james morris

So many times I'm sitting here with Jack running along with various apps and I end up downloading an mp3 which to listen to I just want to type: play downloaded.mp3 but I can't because Jack is running and Sox does not know Jack AFAIK. Are there any similar command line programs for doing this through Jack? I'm only interested in the play facility of sox. Or a way to get round it? Cheers, James.

16 years, 1 month

[LAU] How do i play 24/96 and 24/192 bit files at native rates and verify that it's happening?

by Bearcat M. Sandor

sound card: IntelHD alsa version: 2.6.31-r6 pulseaudio version: 0.9.19 mpd version: 0.15.5 disto: gentoo amd64 Sound file format: Flac Folks, What i would like to be able to do is to play music files at their native rates. I realize that my sound card's rates begin at 48khz, so 44.1khz files may have to be upsampled in any case. That's not preferable but that's alright. However, i'd like to be able to play 96 khz files and 192 khz files at their respective rates with out resulting to upsampling. If i have to upsample everything to 192khz to avoid downsampling files to 48 khz i'll do that but it's not ideal. So, i'm running an mpd player which feeds into pulse audio which feeds into alsa. Do i need to configure all 3 to handle this or should it be working "out of the box"? I've looked around for some sort of display which will tell me at what rate the files are being played in but i can't find one and i don't know if for instance, mpd is passing them in 96 khz or 192 and pulse is down converting, or if mpd and pulse are passing them in 96 khz or 192 and alsa is down converting or something. How can i verify this is working when it's set up? Going by ear may not be reliable. Am i best off just setting up the system to upconvert to 192k? I think that might cause distortion. Right? If so, i'd need set that up in mpd, and pulse and alsa right? Any ideas or pointers would be appreciated. I'll happily give more info if wanted. Thanks a lot, -- Bearcat M. Şandor Cell: 406.210.3500 Jabber/xmpp/gtalk/email: bearcat(a)feline-soul.net MSN: bearcatsandor(a)hotmail.com Yahoo: bearcatsandor AIM: bearcatmsandor

16 years, 1 month

[LAU] ams 2.0.1

by Karsten Wiese

Hi, ams 2.0.1 has just been released. tar.gzip and tar.bzip2 are available at https://sourceforge.net/projects/alsamodular/files/ the NEWS: ======================================== ams-2.0.1 (2009-12-26) Fixed Bugs o Compile error for Qt 4.2 fixed o Highlight MIDI controller in Control Center, if MIDI event has been received. o Fix crash unbinding multiple controllables connected to the same midi controller. o Initialized variable in env-module. Fixes env-module mute bug discribed by lee(mrleelee). General Changes o MIDI channel numbering changed from 0..15 to 1..16. ams-2.0.0 (2009-06-12) New Features o Redesign of 3D look o Application icon o German translation o Keyboard shortcuts for menu and dialog items o Menu item for recently opened files o French translation (by Fank Kober) o New --name command line option to specify the ALSASEQ/JACK clientname o Legato in monophonic mode using the "--poly 1" command line option (by Atte Andre Jensen) General Changes o Port form Qt 3 to Qt 4.x library. o A newly written autoconf/automake environment now provides the usual "./configure && make && make install" comfort. o Command line options are reworked. - JACK now is the default interface, if the connection fails ams connects to ALSA. This behavior can be modified using the -J and -A options. - The initial patch file to be loaded no longer needs the -l option. ======================================== regards & merry xmess, karsten

16 years, 1 month

[LAU] Some MusE video tutorials

by Robert Jonsson

Hi folks, For some christmas fun I've started creating some video tutorials. If anyone is interested they are available here: Tutorial1 http://www.youtube.com/watch?v=11VWsbeT35s Tutorial 2 (pt1 and pt2, they were too big for youtube) http://www.youtube.com/watch?v=846eZ-I05L0 http://www.youtube.com/watch?v=XGwpFmqXK00 Planning to do more of them :) They are still on the beginner level (not that I go much higher myself) Regards, Robert

16 years, 1 month

[LAU] Music made with linux: Modlys - dejlig er den himmel blå

by Atte André Jensen

Hi Today it's the 4th sunday of advent, and I've put some original christmas music in the modlys player. This time it's a new version (new melody and music) to the danish christmas carol "Dejlig er den himmel blå" (Grundtvig), I hope someone enjoys. http://modlys.bandcamp.com/track/dejlig-er-den-himmel-bl direct link: http://modlys.dk/mp3/dejlig_er_den_himmel_blaa.mp3 Merry christmas! -- Atte http://atte.dk http://modlys.dk

16 years, 1 month

[LAU] JACK MIDI -X seq annoyance

by Ken Restivo

This is driving me nuts. When I use the "-X seq" argument to JACK with JACK MIDI, it makes a bunch of bogus connections for EVERY synth, that get reported by ALSA via aconnect -lio,x and make it unreadable. i.e. Connecting To: 128:0[real:0] Connecting To: 128:0[real:0] Connecting To: 128:0[real:0] Connecting To: 128:0[real:0] .... spam spam spam spam..... on every port, of every synth. On my setup, this line gets repeated 28 times. We've got 128:0, we've got [real:0], we've got 128:0 and [real:0], we've got [real:0] and 128:0, we got..... But I don't LIKE 128:0[real:0]! In fact, there isn't any such synth! It doesn't exist at all, according to aconnect. I'm listing the available ALSA MIDI devices, and... other than 0: System, the synths start at 130. There is no 128. It is connected to nowhere. is a ghost device? What's up with this? Is there a way to make it stop? Thanks, and happy holidays. -ken

16 years, 1 month

[LAU] RME Multiface II via direct Alsa (no Jack)

by Brent Busby

This seems to be sort of a FAQ, because I've seen many places this is discussed online, but no thread or blog post ever seems to quite reach an answer, so I figured I'd ask... Up until now, I've been terribly spoiled by Jack-aware applications like Ardour that seem to be able to automatically find all the channels on my Multiface and auto-name them as "playback" and "capture" channels 1 through 18. All this happens without me doing anything, so long as I've got a properly configured realtime Jack daemon running, and the Hammerfall mixer program is running, everything just works, which is fine for programs like Ardour that understand how to talk to Jack properly. However, there are a lot of programs that only understand Alsa, and a surprising number of programs that do compile against Jack but still have Jack support that's very crude and doesn't actually work very well. (There are even a few that can only be used on Alsa at all thanks to Alsa's OSS emulation's fake /dev/dsp.) Currently, I'm dealing with the former -- some programs that have Jack, but it's nearly useless because the Jack support is so bad. I don't even need hard realtime from them. I just want them to see the channels on the multiface and output audio. >From what I've gathered online, I think what I need may be a .asoundrc file. Then again, maybe not: The asoundrc documentation says that what it's doing is basically mapping device/channel names found in /proc/asound/devices (sort of the same info you get from 'aplay -L') to custom names and routings. Problem is, the 18 channels of the Multiface all show up as *one* PCM device here! Where are all my subdevices? For that matter, if I did even try to use that one PCM, which channel would it come out of? (Haven't tried it...not really that curious.) Other people have asked this before, but most such threads seem to always come to "just use Jack." Is it impossible to directly access these devices from Alsa? I'm not wanting anything fancy here. If I do have to write a .asoundrc, where do I get the information that HDSPMixer seems to innately know about how my channels map to the hardware so I can create one? -- + Brent A. Busby + "We've all heard that a million monkeys + UNIX Systems Admin + banging on a million typewriters will + University of Chicago + eventually reproduce the entire works of + Physical Sciences Div. + Shakespeare. Now, thanks to the Internet, + James Franck Institute + we know this is not true." -Robert Wilensky

16 years, 1 month

[LAU] [OT] Hey, thanks for the great gifts !

by Dave Phillips

Greetings, A quick note of deep gratitude to all Linux audio users and devs from whom I have learned and continue to learn so much. Thank you, and I hope you all enjoy the best of the holiday season. Best, dp

16 years, 1 month

[LAU] xrun killer: --sync on jack2

by Jonathan E. Brickman

I think I've got it :-) Muchas gracias to Joakim Hernberg, who posted the jack2 profiling document. I read it about five times, trying to ponder what my first step might be given that info. It discusses two major modes of jack2: the default, which is asynchronous, and another, which is synchronous. Under asynch, my stress-test yields zero xruns (or close) at 5.3 ms (as reported in Qjackctl); but under synch, my last two tests say kosher at 0.667 ms *grin* Shocking. That synch makes a whole lot of difference. I can just imagine jack2 jockeying all four CPUs to make that happen :-) I'll be doing a lot more stress-testing to prove it, but for right now, frames/period are 64, sample rate 192000, two periods/buffer :-) :-) I praise the Lord, and I thank everyone for the help! J.E.B.

16 years, 1 month

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Linux-audio-user December 2009