Linux-audio-user September 2012

linux-audio-user@lists.linuxaudio.org

98 participants
100 discussions

by Ricardus Vincente

Hi, Just for fun I created a google map for linux audio users to post their location (and IRC handle), if they so desire. I've seen it done with other groups, so I thought we needed one of our own. :-) Here is the short link: http://goo.gl/maps/Rk0rC Rich...

13 years

Re: [LAU] hdsp not happy with recent kernels

by peter＠peterlutek.com

> On 09/15/2012 01:25 PM, peter(a)peterlutek.com wrote: >> so, avoiding the irq conflict by unloading firewire modules doesn't solve >> the problem. mrph. > Argh, that seemed like a good lead... > What does "cat /proc/interrupts" show? I think the interrupt count for each cpu should increment. Does it? for a kernel under which jack fails: root@palnote:/home/plutek# cat /proc/interrupts CPU0 CPU1 CPU2 CPU3 0: 43 0 0 0 IO-APIC-edge timer 1: 9 0 0 0 IO-APIC-edge i8042 8: 1 0 0 0 IO-APIC-edge rtc0 9: 734 0 0 0 IO-APIC-fasteoi acpi 12: 2502 0 0 0 IO-APIC-edge i8042 16: 28 0 0 0 IO-APIC-fasteoi mmc0, ehci_hcd:usb1 17: 0 0 0 0 IO-APIC-fasteoi rtlwifi 19: 1 0 0 0 IO-APIC-fasteoi firewire_ohci, snd_hdsp 23: 1855 0 0 0 IO-APIC-fasteoi ehci_hcd:usb2 40: 939 0 0 0 PCI-MSI-edge eth0 41: 14407 0 0 0 PCI-MSI-edge ahci 42: 341 0 0 0 PCI-MSI-edge snd_hda_intel 43: 3975 0 0 0 PCI-MSI-edge i915 NMI: 12 2 13 3 Non-maskable interrupts LOC: 22030 9369 22762 8398 Local timer interrupts SPU: 0 0 0 0 Spurious interrupts PMI: 12 2 13 3 Performance monitoring interrupts IWI: 0 0 0 0 IRQ work interrupts RES: 1012 1465 1348 1568 Rescheduling interrupts CAL: 636 665 426 753 Function call interrupts TLB: 552 534 338 386 TLB shootdowns TRM: 0 0 0 0 Thermal event interrupts THR: 0 0 0 0 Threshold APIC interrupts MCE: 0 0 0 0 Machine check exceptions MCP: 57 57 57 59 Machine check polls ERR: 0 MIS: 0 and for the kernel under which jack runs fine: root@palnote:/home/plutek# cat /proc/interrupts CPU0 CPU1 CPU2 CPU3 0: 124 0 0 0 IO-APIC-edge timer 1: 8 0 0 0 IO-APIC-edge i8042 8: 1 0 0 0 IO-APIC-edge rtc0 9: 731 0 0 0 IO-APIC-fasteoi acpi 12: 2501 0 0 0 IO-APIC-edge i8042 16: 159 0 0 0 IO-APIC-fasteoi ehci_hcd:usb1, mmc0, mei 17: 0 0 0 0 IO-APIC-fasteoi rtlwifi 19: 0 0 0 0 IO-APIC-fasteoi snd_hdsp 23: 484 0 0 0 IO-APIC-fasteoi ehci_hcd:usb2 40: 240 0 0 0 PCI-MSI-edge eth0 41: 5 0 0 0 PCI-MSI-edge firewire_ohci 42: 11334 0 0 0 PCI-MSI-edge ahci 43: 503 0 0 0 PCI-MSI-edge snd_hda_intel 44: 2171 0 0 0 PCI-MSI-edge i915 NMI: 0 0 0 0 Non-maskable interrupts LOC: 18709 15972 13871 12078 Local timer interrupts SPU: 0 0 0 0 Spurious interrupts PMI: 0 0 0 0 Performance monitoring interrupts IWI: 0 0 0 0 IRQ work interrupts RES: 12558 5658 12784 13897 Rescheduling interrupts CAL: 162 195 300 249 Function call interrupts TLB: 320 538 365 855 TLB shootdowns TRM: 0 0 0 0 Thermal event interrupts THR: 0 0 0 0 Threshold APIC interrupts MCE: 0 0 0 0 Machine check exceptions MCP: 2 2 2 2 Machine check polls ERR: 0 MIS: 0 not sure what you mean by "the interrupt count for each cpu should increment", but i don't think i'm seeing anything that looks like that. > Sorry, don't quite know where to go from here, looks like something for kernel gurus in lkml... > -- Fernando well, we'll see if anything comes out of the above first.... i'm kinda busy this week to engage a discussion with a bunch of kernel devs! thanks again... cheers! .pltk.

13 years

droning152 & droning153

by Louigi Verona

Hey fellas! I was busy last several days putting together new droning recordings. While anyone interested can check all of them from the site, in this batch I would like to highlight these two: 152 and 153. http://www.disc-shelf.com/droning/droning152.ogg http://www.disc-shelf.com/droning/droning153.ogg droning153 is also available from YouTube: http://www.youtube.com/watch?v=FF4jxMxpo8U -- Louigi Verona http://www.louigiverona.ru/

13 years

sync jack as slave to external mtc or mmc

by Ch.Bunge

Hallo, I want do sync my old atari programs with mtn/mmc to jack. I did some experiments with ardour rosegarden and muse. Start and stop commandos work, but all programs don't synchronize the tempo. Is there a program that can sync jack as slave to external mtc or midi clock? thanks -- www.christian-bunge.de -- www.christian-bunge.de -- www.christian-bunge.de -- www.christian-bunge.de

13 years

problems compiling eq10q

by Julien Claassen

Hello everyone! Trying to compile eq10q I have a problem: I can't compile plotmm and Debian Squeeze has no package named plotmm. Two alternatives: Can I exclude the GUI creation from the Makefile? If not: in plotMM I get a problem, that sigC is not defined. Which package to install for that? I have libsigc++-2.0 and libsigc++-02c (plus dev of course). I also installed libsigx on a whim. No go. Version of one of them too new perhaps? Kind regards Julien ---------------------------------------- http://juliencoder.de/nama/music.html

13 years

SFLC and ac-3

by Patrick Shirkey

Hi, It has come to my attention that the SFLC has said they are not prepared to take on Dolby in regards to licensing the ac-3 patent to the OBE project for professional broadcasters. Apparently they feel that ac-3 is not a big deal to the Linux Audio community and that professional broadcasters should be left to take on Dolby at their own expense. I am wondering what people on this list feel about their position and Dolby's unwillingness to play fair under their FRAND obligations. This is also linked to the attack on Kim Dotcom that has been undertaken by certain Hollywood players and it has had a direct impact on the New Zealand movie industry as well as delayed the release of the Hobbit movies among other things. My feeling is that this would be a very big case for the SFLC to fight and they would be more interested if they knew how much it affects Linux Audio and Multimedia software adoption for professional use. -- Patrick Shirkey Boost Hardware Ltd

13 years

sample rate convert a .wav from 48k to 44.1k

by Aaron L.

I didn't realize I had jack set to a 48k sample rate and exported a wav. Oops. Any simple way to convert this? I just used sox to do this: sox export.wav -r 441000 resample.wav Exported 500MB of silence. Thanks for any advice.

13 years

ALSA - JACK via loopback device

by Sebastian Rose

Hello, currently I have set up a ALSA <-> JACK connection with the loopback device approach as described here: http://www.penguinproducer.com/2011/11/jack-alsa-bridge-kit/ This works fine, except for one problem: Simultaneous playback of multiple applications using the ALSA loopback device to channel the audiostream to JACK fails with this error: Device or resource busy The setup in my asound.conf is quite simple: # Audio _to_ JACK pcm.jack_playback { type plug slave.pcm "hw:Loopback,0,0" } # Audio _from_ JACK pcm.jack_capture { type plug slave.pcm "hw:Loopback,0,1" } pcm.playback_loop { type plug slave.pcm "hw:Loopback,1,0" } pcm.capture_loop { type plug slave.pcm "hw:Loopback,1,1" } pcm.jack_audio { type asym playback.pcm "jack_playback" capture.pcm "jack_capture" } I thought that "type plug" should autoconfigure the device in use accordingly. I tried to make a manual configuration with dmix but it didn't work and I'm not sure if it is necessary. The alsa documentation states that dmix is used when the device has no hardware mixer and I'm quite sure that a virtual loopback device has none. best, semkath

13 years

Log F-scale for JAPA

by Fons Adriaensen

Hello all, I've been asked (in a private mail) if I would provide 'upstream' support for the logarithmic F-scale patches for JAAA which have been discussed recently on this list. The answer is maybe, but certainly not in their current form. 1. As a first and sufficient reason, I don't want to develop the current codebase any further. It's a glorious mess, and in order to add some other features I want to add it needs to be redesigned from scratch or at least completely refac- tored. 2. The current log X-axis grid and annotations are a no-go. I pride myself on getting such things (including slider and meter scales etc.) right, even if that often takes more work than the actual DSP code. Very few tools get this right, even Gnuplot's log scale is useless in many cases (try zooming in). A decent log F-axis needs a lot of ad hoc code (which I mostly have, from other projects). It needs to support arbitrary zooming, and both a technical (i.e. based on a 1, 2, 5, 10 sequence) and a musical (based on octaves, as in JAPA) format. 3. JAAA's original purpose was to measure organ pipe spectra (it was presented at the same LAC as Aeolus IIRC). More generally it is a technical tool, meant for for electronic or acoustic engineers, not for sound engineers doing their normal job of recording or mixing music. As a technical tool it must provide results that are both as accurate as possible and well-defined. Well-defined means results that correspond to quantities, equations, etc. that are used in electronics, acoustic and DSP theory, not necessariy the most relevant ones in a musical context. For such technical uses the most convenient presentation is on a linear F-scale, for the simple reason that the analysis performed by JAAA (essentially a DFT with some extensions) is defined in terms of a linear frequency domain. 4. In those cases where a logaritmic frequency axis presentation would make sense (the classical 'marketing style' frequency response plots), JAAA is simply not the right tool. It does not provide enough resolution at LF, or tons of irrelevant and misleading detail at HF. And anyway, you can't measure speakers, mics, etc, with continuous signals (as expected by JAAA) unless you have a large anechoic room at your disposal. And if you really want to do such measurements, the tool the use ATM is JAPA with either a slow logarithmic sine sweep or pink noise. There *is* a lack of good Linux based tools for this sort of thing, but the cure is not a log F-scale for JAAA but some extra features in e.g. Aliki. But of course I'm looking at this from my perspective. If there are any people out there using JAAA _and_ wanting a log F-scale I'd like to know what exactly they are doing. It may not result in a log F-scale for JAAA, but maybe in something better. Ciao, -- FA A world of exhaustive, reliable metadata would be an utopia. It's also a pipe-dream, founded on self-delusion, nerd hubris and hysterically inflated market opportunities. (Cory Doctorow)

13 years

Re: [LAU] Google Map of linux audio users

by Gene Heskett

On Saturday 22 September 2012 11:38:22 Ricardus Vincente did opine: > On Fri, 2012-09-21 at 23:13 -0400, Gene Heskett wrote: > > An even better idea would be to tell us how to place a pin. Its not > > obvious. > > When the maps loads, you will see an EDIT button. The EDIT button will > appear on the page where you see the SAVE/DONE buttons in the attached > image. Hit the EDIT button, and after a few moments, a toolbar will > appear at the top of the map (see attached image). Select the middle > tool (I call it the pin tool). When you have selected it, some sort or > marker, or X (the pin) will appear under your mouse cursor. Drag the pin > to your location, and when it's where you want it, click the left mouse > button. You might have to change the zoom level (zoom out) of the map to > get where you want to go more quickly. As you get closer to your desired > location, you can zoom in more to get a more precise placement. You > should also see a dialog in which you can enter your IRC nickname, or > name, and some other info about yourself. > > Please be careful when you are in edit mode, because you can move other > peoples' pins. > > When you are finished hit SAVE and DONE and you should be fine. > > http://goo.gl/maps/Rk0rC > > Rich... I got it, sorta. That page needs popup help in the worst way. I centered my location on the map, then clicked on the pin, and the map took off north about 10 miles before it autoplaced the pin by hitting the lower border of the window. And it only gave me one chance to move it afterwards. The pin and the map became locked and couldn't be unlocked. It is within about 100 feet, but the map of my subdivision is so wrong that its difficult to make sure I put it correctly. Two adjacent streets show the same name, and another street whose name should be on the eastern duplicate named street, does not exist and had not existed in the about 50 year history of this development. That of course is not your fault, thats 100% google's problem. It also appears that the sat photos have been updated since 2008, with new stuff that is much less sharp so it is no longer possible to overlay the photos on the street map to correct it with absolute certainty. I have done this once before, quite some time back, and compared to that experience, this version has more bugs than 7 day old road kill. That too, is quite likely NOT this groups problem. For this particular application, I'd have to say that the programmer should have been (figuratively) shot 5 years ago when it was a usable application. Oh well, perhaps another shot of coffee will help my attitude? When one is north of 3/4ths of a century, it does tend to get a bit jaded. Thanks all who responded. Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> is up! A bug in the hand is better than one as yet undetected.

13 years

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Linux-audio-user September 2012