Linux-audio-user October 2004

linux-audio-user@lists.linuxaudio.org

153 participants
223 discussions

[linux-audio-user] Fullduplex on PPC hardware

by Marijn P. Vriens

Hi all, I need to use the soundcard of a Apple IMac and IBook in Fullduplex audio mode. I installed kernel 2.6.8 and i am using snd-powermac as the audio driver. I have been trying with ohphone to see if fullduplex works. Unfortunately it keeps saying: "Could not open sound device - Check permissions or full duplex capability." (even when running as root). Now, Apple being Apple, and this being post 2000 hardware, I do not think that the hardware is only half duplex (but i have no conformation one way or the other). It makes more sense that it's the driver. So my question is: Does anybody know the status of full-duplex support of PowerPC hardware under linux? Do I need to give some special options when inserting the module or patch the kernel? I read somewhere that you need to enable 2 DMA channels for full-duplex support, does this have anything to do with this problem? Regards, Marijn. -- Director Tecnológico Tecnocimiento.

20 years, 2 months

[linux-audio-user] Re: extract audio from avi

by Juhana Sadeharju

>From: Andrew Gaydenko <a(a)etver.com> > >What is the simplest way to extract an audio (to wav file) from >a video avi file? I'm not sure does the suggested techniques work in practise. All AVI files seems to not work in Linux due that they need MS Windows dll files to play. (And those dll's are not sold and given separately.) In my opinions, RealMedia, WindowsMediaPlayer, etc. should have a record button so that the stream can be recorded to disk. But now the stream cannot be even copied to disk. University has Ms Windows systems and I know of no way to record audio from the streams to disk (except use of external recorder). Juhana -- http://music.columbia.edu/mailman/listinfo/linux-graphics-dev for developers of open source graphics software

20 years, 2 months

[linux-audio-user] making Athlon XP a dual Athlon MP for linux audio purposes?

by Piotr Sawicki

Hi All, Does anybody tried to link the L5 bridge on the Athlon XP to work as a dual Athlon MP for using linux audio? I have found on: http://www.hardwarezone.com/articles/view.php?cid=2&id=393&pg=2 a howto for it, but they say it is rather for enthusiasts and not really for production machines, so I wanted to know, if any of You had experience with this, and if its stable, and how it works with linux audio (because there was only windows xp tested). I'm considering to buy a second hand tyan mainboard Tiger MP S2460. Do you have any better solutions? Thanks Piotr -- Kopalnia Dzwieku Piotr Karol Sawicki email: pelle(a)plusnet.pl strona domowa: www.piotr.art.pl gg: 8976726 jabber ID: pelle(a)jabber.aster.pl

20 years, 2 months

[linux-audio-user] 2.6.9-rc3-mm3 no keyboard error

by thewade

Im trying to get a VP kernel to build on my AMD64 laptop. I get a kernel Aieee when I try to boot 2.6.9-rc3-mm3-T3 so I decided to try mm3 alone. When I try to boot, it boots fine except my keyboard is disabled. Any reason why? I used a .config file from 2.6.9-rc3 that works fine (except I have to unplug my usb mouse to boot). What can I do to get my keyboard to work, so that I may move on to getting a VP kernel to build? Thanks for the help! -thewade

20 years, 2 months

[linux-audio-user] Stereo effect question

by Mark Wilson

Another noob audio effect question: What tools (software) and techniques are used to accomplish the effect of a source of sound appearing to move gradually from one speaker to another? I'm not talking about mere channel swapping, but rather something like the final auditory illusion suggesting gradual movement, e.g. a horse galloping by, or a train with its whistle being 'dopplerized'. Is this probably way over my head? Or something easily accomplished once I get a nudge in the right direction? My soundcard (SB PCI 16) is actually quite limited, but I should think that, given the right software and data input, the computer should calculate how to simulate the effect, even if my consumer-grade sound card could only render the effect with limited fidelity. (An analogy might be a great quality video clip on a crappy monitor?) I'm not that concerned with real-time performance--couldn't care less if it takes 5 minutes to process a 5-second effect, as long as I know where in the workflow to try to add the new task. ;-) Thanks again for any thoughts on the matter, Mark ===== -- Seek professional help! Ask a librarian. _______________________________ Do you Yahoo!? Declare Yourself - Register online to vote today! http://vote.yahoo.com

20 years, 2 months

RE: [linux-audio-user] Stereo effect question

by Reuben Martin

>Another noob audio effect question: >What tools (software) and techniques are used to >accomplish the effect of a source of sound appearing >to move >gradually from one speaker to another? >I'm not talking about mere channel swapping, but >rather something like the final auditory illusion >suggesting gradual movement, e.g. a horse galloping >by, or a train with its whistle being 'dopplerized'. A simple pan should suffice. If you want the doppler effect an automated pitch change should do the trick. (any simple editor with panning and plug-in support) If you want to model the environment, the TAP reverb editor would probably be best for that. None of this is hardware dependant. Your soundcard should work just fine. -Reuben

20 years, 2 months

[linux-audio-user] 2 C-Ports simultaneously ?

by Geoff Beasley

Does anyone here know if 2 C-Ports (ice1712) can be run simultaneously under alsa ? any experiences, clues, pointers ? cheers.

20 years, 2 months

[linux-audio-user] planetedge kernels

by Joey Reid

Hi all. This is probably a question for Fernando, but I am not subscribed to the CCRMA list, so I will post it here and hope you will be kind. I decided to try a kernel from the planetedge to experiment with low-latency 2.6. I installed the S7, since looking at the archives that appears to be the one people have been having luck with. I haven't been able to boot it, and I think I know why. Looking at the kernel config, it shows # CONFIG_BLK_DEV_IDE_SATA is not set and my system is on a SATA disk. Bummer. So I would like to know, without downloading and trying all the planetedge kernels, do any of them have CONFIG_BLK_DEV_IDE_SATA=y? And is the reason it is turned off because the default config for the kernel is so? Is there an issue there? And does anyone know how to rebuild a kernel rpm using a different config? Anyhow, thanks for your time.

20 years, 2 months

[linux-audio-user] Problem with mm3 kernel, where to post?

by thewade

Hello, I still have not resolved my problem with kernel 2.6.9-rc3-mm3 and the keyboard being disabled. Where should I post my bug to; is there a list devoted to mm devel? Thanks! -thewade

20 years, 2 months

[linux-audio-user] Linux IRQ datapoint

by Mark Knecht

I was building a new kernel under FC2 this morning trying to make FC2 equal to my Gentoo kernel which is working very well. I made a mistake on this new kernel and forgot to turn on 'APIC contoller for UMP machines'. When the kernel booted I got all sorts of xruns. The IRQ was threaded, so I set it for non-threaded but still got a lot of xruns. (>100 in 10 minutes) I rebuilt the kernel where the only change I made was to enable APIC interrupts and IO-APIC controllers for UMP. The kernel booted and has been running for 30 minutes with no xruns... Just another IRQ datapoint, but that was the only change I made... - Mark

20 years, 2 months

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Linux-audio-user October 2004