Linux-audio-user September 2005

linux-audio-user@lists.linuxaudio.org

157 participants
172 discussions

[linux-audio-user] ANN: hearnet 0.0.4--Don't Paniq

by Hans Fugal

Leonard paniq Ritter sent me a nifty patch for hearnet some time ago. I really dig it, and I finally got around to incorporating the patch and releasing a new version. Here's what paniq has to say about it: changed code so that it uses 32-voice polyphony and plays bridges / chromatic orders. as an effect, you get very harmonic sounds if packet sizes on a site are the same, and quite weird stuff if packet sizes vary. Go get it and see how much cooler it sounds! http://hans.fugal.net/src/hearnet Now, this brings up a JACK question. I'm on 2.6.13-rt13 (desktop) using PAM with the rtlimits patch. JACK starts up happily in realtime mode, and JACK apps I start as me play together nicely. But hearnet must be run as root to be able to sniff the network, and therefore it can't connect to the JACK server. Is there anything I can do in hearnet code, or anywhere else, so that I can have it talk to my existing user-started jackd? -- Hans Fugal | If more of us valued food and cheer and http://hans.fugal.net/ | song above hoarded gold, it would be a http://gdmxml.fugal.net/ | merrier world. | -- J.R.R. Tolkien --------------------------------------------------------------------- GnuPG Fingerprint: 6940 87C5 6610 567F 1E95 CB5E FC98 E8CD E0AA D460

18 years, 9 months

Re: [linux-audio-user] latency: video card contribution

by Dmitry S. Baikov

> all depends on the definition of "reasonable price". :) I meant light laptop. Better less magic 2.2 kg, where most of light but powerful enough laptops are. Possibly with external CD. And with price around $1500 in Russia. Acer TravelMate 3002 looks good, has fast cpu, but shared video mem. Sony VGN-S480 is cool (nv6200) but $2100. At least it exists. The thing is, I can't afford 2 laptops - a powerful one and a light one. > i can do 26x26, 64 frames/interrupt on my RME digiface cardbus with an > nvidia video > controller. HP Pavilion zd7000 "desktop replacement" > Great! Are you using nvidia binary drivers? Dmitry.

18 years, 9 months

[linux-audio-user] latency: video card contribution

by Dmitry S. Baikov

Hello! Another set of questions for experienced Linux Audio Users. Mainly it's related to laptop performace. It seems the choice of video system for modern laptop consists of two main alternatives: 1) dedicated high performance controller (nvidia/ati) with closed source drivers 2) shared memory controller (intel) with open source drivers People on Windows forums (no choice for Apples) prefer dedicated controller (with own video memory) because shared memory video degrades performance and increase latencies (they say, and in windows). I suppose, under Linux the things are different, because minimal possible latency is directly related to interrupt processing: closed source drivers have arbitrary interrupt paths, surely are written to maximise video performance and thus, should play a bad role in latency. Moreover they cannot be fixed. Open source ones at least can be fixed. Or I am completely wrong and shared video memory makes it bad on a hardware side (locking pci bus, for example)? So, the question is: what to choose, integrated intel solution or ati/nvidia one (in this case, nvidia is preferred, because of driver quality). Thank you. Dmitry. P.S. As a target system, imagine laptop with RME Cardbus.

18 years, 9 months

[linux-audio-user] MIDI sequencing "best practices" with multiple tracks?

by mrmoo1231＠ahooyay.omcay

I've been working on sequencing some stuff (favorite 20th cent. organ pieces) using apps like Rosegarden or Muse, and since I don't have a MIDI keyboard hooked up, I input tracks based on the different organ-stop colors intended by the composer. What I'm wondering is, are there certain principles to efficient sequencing, such as avoiding long stretches of "non-events" in a track? Is it better, say, to end a track at the last note event in a phrase, and then pick up with a different track or different segment when that particular "voice" starts again? Am I making sense? Thanks for any ideas or thoughts. Cheers, Mark __________________________________ Yahoo! Mail - PC Magazine Editors' Choice 2005 http://mail.yahoo.com

18 years, 9 months

Re: [linux-audio-user] I/O scheduler for 2.6 kernel

by Mark Knecht

On 9/30/05, Mike Taht <mike.taht(a)gmail.com> wrote: > > > > > Probably I should report this in a separate thread. I do not intendto > do any thread hijacking here but it does seem related. > > Yesterday I finally managed to build 2.6.14-rc2-rt7 for my AMD64system. > Out of the box it's working very, very well. I've doneabsolutely no > configuration of the system. I've not set anythingspecial. Just booted it, > started Jack at 128/2 as a user usingrealtime-lsm, and have been streaming > ogg files for 4 hours from oneof my 1394a audio drives. In that time I've > been browsing the web,doing email and updating the system. I've built a new > kernel, copied abunch of files from drive to drive and run a couple of > existing Ardoursessions. While all of that was going on I fired up xine and > played aDVD movie in the background on my EIDE DVD drive just to create > somemore system usage. > > I've not had a single operational xrun in nearly 4 hours. The onlyones > I've had come when starting and stopping apps. > > Everything's working great for me, but this is less than 24 hoursso far > so take it with a grain of salt. > > This is Gentoo, AMD64 3000+, 512MB, 250GB SATA drive, 4 1394 > harddrives( three 1394a and one 1394b) , PCI-Express 16X ATI. > > Note: Executables seem larger on this AMD64 system. I'll needanother > 512MB one day soon as I do seee a small amount of swapping onthis system. > (<30KB) I never saw that when running 32-bit. > > Cheers,Mark > > > > welcome to the 64 bit world.... I am planning on adding at least another gig > of ram to my laptop shortly, 'cause linuxsampler is eating me alive. I've > already done stuff like get rid of gnome (now running evilwm), and turn off > all non-essential services... can't run ardour+rosegarden+linuxsampler > w/bosendorfer all at the same time without putting quite a bit on swap, and > I get to about 30 voices on LS before it starts to break up. I think if you put in another GB LS will just eat that up also. I've tried to get the developers to put some limits on it but I haven't been very successful. (Full disclosure - I'm till using a pretty old version myself. Maybe it's better now...) > > I started using the cfq scheduler a bit last week. It + the ionice utility > *seemed* to improve LS's performance but that may be a placebo effect. > > thx for testing the latest series of rt kernels. I had got to a stable > kernel a month or two back and didn't want to upgrade. :) Don't blame you! This wasn't easy, but hey, I did it! Cheers, Mark from down the hill...

18 years, 9 months

[linux-audio-user] I/O scheduler for 2.6 kernel

by Antonio

Hi to the list, I've compiled a 2.6.12 kernel in my debian system (using the debian sources). I want to obtain the best latency possible without using the realtime patch. I've noted that there are three i/o scheduler in the kernel config: Device Drivers ---> Block devices ---> IO Schedulers ---> <*> Anticipatory I/O scheduler <*> Deadline I/O scheduler <*> CFQ I/O scheduler I've compiled them all as built-in. Which is best for low-latency audio work? Can I change the scheduler while the system is running (I read it somewhere)? The file /sys/block/hda/queue/scheduler contains: noop [anticipatory] deadline cfq so which scheduler am I using now? I've tried to echo cfg to that file but it remains the same. I appreciate any information, link or other to make light on the matter. Thanks for any answer, ~ Antonio

18 years, 9 months

[linux-audio-user] can't start jackd from normal user

by Antonio

Hi to the list, I've a problem starting jackd from a a normal user. I'm on debian testing and even using non-realtime mode I got this message: $ jackd -dalsa jackd 0.100.0 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 create /dev/shm/jack-1000 directory (Permission denied) cannot create server sockets cannot create engine $ _ As you see I've jackd 0.100 (in testing there is 0.80) because after seeng this problem I've upgraded to the unstable version, but I have the same problem. I've tried both with my own kernel and with the debian binary kernel (both are 2.6.12). From root jackd works perfectly. This evening I'm going to try to compile 2.6.13, I will report any news. Thanks for any answer. Best Regards, ~ Antonio

18 years, 9 months

[linux-audio-user] first remix on remix.linux

by Shayne O'Connor

hi all i've just killed lotsa brain cells by cutting and dividing two great submissions to remix.linux (Turn Back the Tide by Blues LSD and ATT by James Shuttleworth) into some sort of remix/mashup ... thought i'd get the ball rolling - not sure what this is like as i've since lost all critical faculties - let me know what you think. my apologies to the original artists :D http://remix.machinehasnoagenda.com/media/files/thegirls/9 shayne

18 years, 9 months

Re: [linux-audio-user] Alsa issues

by Terrence van Ettinger

Somehow, though, I didn't get the virmidi module. Can I put that in separately? Also, what is out there io the way of console-based sequencers, and for using a midi-capable keyboard, do I need to reboot, and/or get other modules/drivers/etc? Thanks, Terrence -- Yahoo: terrencevak; AIM: terrence van e; MSN: ganvira(a)hotmail.com; ICC: terrencevane Moderator: Sonic Theater Discussion ( http://www.yahoogroups.com/group/xm163 )

18 years, 9 months

[linux-audio-user] hdsp pcmcia woes

by Orm Finnendahl

Hi, I bought a new rme pcmcia card. hdsploader can't put the firmware on the Multifaces (it reports an i/o error). I tried two different Multifaces which both work fine with my pci cards and an old pcmcia card and different cables with the same result. the firmware revision of the not-working pcmcia is 32, the firmware of my old pcmcia is 0a. Can anybody, who has a working pcmcia card, send me the revision number of his card if its higher than 0a? (check the output of `lspci` for something like "0000:03:00.0 Multimedia audio controller: Xilinx Corporation RME Hammerfall DSP (rev 0a)" I will try to contact RME to find out whether I can downgrade my pcmcia to a working revision. -- Orm

18 years, 9 months

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Linux-audio-user September 2005