Linux-audio-user April 2009

linux-audio-user@lists.linuxaudio.org

112 participants
101 discussions

by torbenh＠gmx.de

hi... i wrote an audio output driver for flashplayer, based on lennart poetterings pulse driver. git clone git://repo.or.cz/libflashsupport-jack.git -- torben Hohn

16 years, 10 months

[LAU] meeting, rtf to html, & demos.

by andy baxter

Hi all, The meeting last night was good but not many people (me, Wayne, and Rik). Does anyone know a good way to convert rtf to nice html (i.e. using proper codes like h1 h2 etc, not <p class="Heading1"> which is what open office does)? It's only one document that I have to convert, so not really worth taking the time to write a script, but it would save me a bit of time if there's an automatic way of doing it. Also, is anyone up for doing a talk or demonstration? The third wednesday in April would be good. I could talk about what I've done to set up my slug with debian, and give a dummy's guide to basic security issues (which I've been learning about before putting the slug online.) andy

16 years, 10 months

[LAU] Some News....

by alex stone

Some news.......... http://createdigitalmusic.com/2009/04/01/garritan-rescues-giga-sampling-tec… -- Parchment Studios (It started as a joke...)

16 years, 10 months

[LAU] Edirol PCR-300 under Linux?

by Darren Landrum

I was looking at different master controller keyboards, and this one really got my attention. It does MIDI over USB, and has its own software, so I'm wondering if anyone might have an inkling how well this controller would work under Linux. I think it has a straight MIDI out, if all else fails, but I need to make sure of that. Thanks for the help. -- Darren

16 years, 10 months

[LAU] snd-virmidi not working

by Crypto

Hi, I understand that the module snd-virmidi can be loaded via modprobe from the command line. BUT: I cannot get it to work. The module does not pass any data transferred to it. What am i doing wrong? I simply connected one MIDI output of things like the vkeybd to the virtual MIDI port and then connected kmidimon to the virtual port to see if something is happening. But nothing. Any helpful hints on this? kernel is 2.6.29-0.slh.1-sidux-686. MIDI is working fine otherwise. Regards, Crypto.

16 years, 10 months

[LAU] jdelay - measured latency of a usb interface

by hollunder＠gmx.at

Hi everyone. I was kind of curious about the real latency of my system and did a series of tests using jdelay (http://www.kokkinizita.net/linuxaudio/). I share my results so others can see what to expect from such a usb audio device and also because.. ! Important ! I ran in a number of oddities that I can't explain myself. This could mean that my results here are totally useless, so please don't take them for real until someone can hopefully clarify those matters. General Information: ------------------- Audio Interface: Edirol UA-25 http://www.rolandus.com/products/productdetails.aspx?ObjectId=704 http://alsa.opensrc.org/index.php/Edirol_UA-25 It can work in 44.1, 48kHz duplex and 96kHz either record or playback, so I couldn't (and wouldn't have anyway) tested 44.1 and 48kHz. There are Periods/Buffer from 2 to 42 possible, most common is I believe 2 and 3 Periods/Buffer, I only tested these. My pc is rather old, mainboard is a via km400 or km400a if that helps anything. On the software side there is Arch Linux with it's latest stock kernel, 2.6.28.8, jack 0.116.2 and qjackctl 0.3.4 (the patchbay made this a lot easier). Measurement Results: ------------------- SR 44100 ----- Frames Periods F*P/SR Measured 64 2 2.9 8.2 128 2 5.8 11.1 256 2 11.6 15.9 512 2 23.2 28.5 1024 2 46.4 52.7 2048 2 92.9 102.1 4096 2 185.8 187.1 64 3 4.4 9.7 128 3 8.7 14.0 256 3 17.4 22.7 512 3 34.8 30.1 1024 3 69.7 65.0 2048 3 139.3 138.6 4096 3 278.6 279.9 SR 48000 ----- Frames Periods F*P/SR Measured 64 2 2.7 7.9 128 2 5.3 10.5 256 2 10.7 15.9 512 2 21.3 26.5 1024 2 42.7 48.9 2048 2 85.3 94.5 4096 2 170.7 171.9 64 3 4 9.2 128 3 8 13.2 256 3 16 21.2 512 3 32 27.2 1024 3 64 60.2 2048 3 128 127.2 4096 3 256 257.2 Questions to the wise guys: -------------------------- 1) As probably everyone has noticed, with 3 periods/buffer and frames/period of 512, 1024 and 2048 the measured latency is smaller than the calculated latency. I don't see how this can be possible since, as far as I understand it, the measured latency should be the calculated + some. 2) When doing those measurements I noticed that with 44100 the Frames reported by jdelay always ended in .732 Frames and with 48000 always ended in .761 Frames. I found out that I can change that value by changing the sensitivity of the input or the amplification of the output. In the case the variance is below one frame, but I find it very strange that it's always the same at a given amplification/sensitivity. 3) Is it normal that the difference between calculated and measured latency varies so much? Shouldn't it just always be the same? 4) Should these results be similar with any usb interface? What does have most influence on such results? I hope this can be of use after the remaining questions have been answered. Best regards, Philipp

16 years, 10 months

[LAU] 2.6.29-rt1 BootupVideo Mode

by David Baron

Made the kernel, booted fine. Once I got into the graphics kde4. The text-mode bootup was completely kerlbooey! So what might I place in my lilo.conf to get this straightened out (using an older matrox mila g200 at 1200x1065)? Currently has vga=6.

16 years, 10 months

[LAU] moving firewire interface to other interrupt

by Atte André Jensen

Hi It seems at least part of my problem with my edirol fa-66 firewire card is due to the fact that it shares interrupt with the graphic card :-( atte@vestbjerg:~$ lspci -v <snip> 00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controll er (rev 03) (prog-if 00 [VGA controller]) Subsystem: Toshiba America Info Systems Unknown device ff50 Flags: bus master, fast devsel, latency 0, IRQ 17 Memory at f0000000 (64-bit, non-prefetchable) [size=1M] Memory at d0000000 (64-bit, prefetchable) [size=256M] I/O ports at 1800 [size=8] Capabilities: <access denied> <snip> 00:1a.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #4 (rev 03) (prog-if 00 [UHCI]) Subsystem: Toshiba America Info Systems Unknown device ff50 Flags: bus master, medium devsel, latency 0, IRQ 17 I/O ports at 1820 [size=32] <snip> 0a:01.0 FireWire (IEEE 1394): Ricoh Co Ltd R5C832 IEEE 1394 Controller (rev 05) (prog-if 10 [OHCI]) Subsystem: Toshiba America Info Systems Unknown device ff50 Flags: bus master, medium devsel, latency 32, IRQ 17 Memory at f0400000 (32-bit, non-prefetchable) [size=2K] Capabilities: <access denied> <snip> I looked in the bios, but it seems interrupts can't be moved around (it's a toshiba laptop). Is there anyway to move the interrups by software? Anything else that could be done? Or should I simply admit I wasted my money and use the fa-66 as paper weight? -- Atte http://atte.dk http://modlys.dk

16 years, 10 months

[LAU] playback glitches with the edirol ua-101

by Miles Egan

I have this USB audio interface working with my Ubuntu 9.04 system, but I get very frequent clicks and pops, whether I run it via jack or directly through ALSA. I don't get these pops with either a Native Instruments Audio Kontrol 1 or a Novation Xiosynth. Could this be related to the playback sync issue mentioned here? http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h… Does anybody have this interface working without these glitches? -- miles http://kuniklo.bandcamp.com

16 years, 10 months

[LAU] Programming for Lilypond (how to become an developer)

by Grammostola Rosea

Hi, I'm just an Lilypond user, not an programmer. I really think Lilypond is a core app for GNU/Linux musicians and many apps has Lilypond export functions. To keep improving Lilypond and because some people are starting to work on some Tablature improvements, which makes me really excited, I thought, let's make a call. Maybe you are a Lilypond user with a little programming background and want to contribute to Lilypond or you need a special feature/ improvement in it. Then you can start learning to do the programming yourself. You can start as a Frog, some kind of 'Lilypond student programmer'. You start learning the basics, maybe fix some bugs (like Frogs eat flies) and add some features you want with the help of the Lilypond developers. More info about developing for Lilypond: http://lilypond.org/web/devel/participating/ You can see the Contributors' Guide for some detailed information about participating: http://lilypond.org/doc/v2.13/Documentation/devel/contrib-guide/index#index At this moment there are some guys beginning to work on more and better Tablature functionality for Lilypond. Which is great imo also to get better Tablature functionality in GUI apps like Mscore and Tuxguitar. So maybe it's a good moment to jump in, and I think they can use some man power! See for example these threads: http://www.nabble.com/guitar-tab-feature-request-td21995370.html Thanks in advance, \r (Just an happy Lily user/ guitarist)

16 years, 10 months

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Linux-audio-user April 2009