Linux-audio-user October 2003

linux-audio-user@lists.linuxaudio.org

112 participants
140 discussions

[linux-audio-user] Question regarding the alsa's audio latency benchmark

by Ivica Bukvic

Hi all, I've had an interesting discussion with a professor and a distinguished member of the electroacoustic music community regarding audio latencies which made me realize that I did not understand the issue in its entirety. Hence, I looked around the net in order to educate myself. I soon stumbled across the following site: http://old.lwn.net/1999/0916/a/latency.html Admittedly, it's quite old but that, if anything speaks only in Linux's favor in terms of its pro-audio readiness. At any rate, I was checking out the benchmark data and was wondering as to how did this person/software app get to the 0.73ms buffer fragment that is equal to 128bytes? In other words, what sampling rate was used? 128 bytes in 44100Hz sampling rate = 3ms 128 bytes in 88200Hz sampling rate = 1.45ms 128 bytes in 176400Hz sampling rate = 0.725ms (this one being obviously closest, but at the same time, what kind of hardware supports this sampling rate, especially in 1999 when this test was done?) 128 bytes in 192000Hz sampling rate = 0.3ms So what gives? It seems like it is some kind of a 176k-ish sampling rate that, AFAIK does not exist. Furthermore, my question is what app was used to produce those graphs/results and whether these latency tests take into account hardware latencies (i.e. DSP converters, PCI->CPU->PCI->output etc.), in other words, is this latency that is achievable with the following setup: Input->soundcard->cpu(with some kind of DSP)->soundcard->Output Your help on this matter is greatly appreciated! Ivica Ico Bukvic, composer & multimedia sculptor http://meowing.ccm.uc.edu/~ico

20 years, 6 months

Re: Re: Re: [linux-audio-user] Midi Keyboard connect error -- can somebody help me ?

by hexe_2003＠directbox.com

-------- directBOX Reply --------------- From: clemens(a)ladisch.de To : linux-audio-user(a)music.columbia.edu Date: 06.10.2003 15:52:02 hexe_2003(a)directbox.com wrote: > ESS-Solo1 MIDI on the ES1938 doesn't work (because ESS' documentation isn't). Get another sound card. Regards, Clemens ----- REALLY ?!??!?!?! Well, that also sounds possible :((((((((((((( baaad :) ; Well, if its true ( I'll check that :) ): THX A LOT !!!! ( I thought something like ' I bought a 89 EUR MIDI-keyboard and it doesn't work ' greez, Sascha Retzki --------- Well, I want to add this question : Does a ES1371 work ? ( it is the name Knoppix tells me, that is 'hwdetect' and this should be the OSS-Layer ...) greez, Sascha Retzki __________________________________________________ Verpassen Sie keine eBay-Auktion und bieten Sie bequem und schnell über das Telefon mit http://www.telefonbieten.de Ihre eMails auf dem Handy lesen - ohne Zeitverlust - 24h/Tag eMail, FAX, SMS, VoiceMail mit http://www.directbox.com

20 years, 6 months

[linux-audio-user] latency issues

by dwillis＠stx.rr.com

two years ago i did a bunch of testing on latency to find the best kernel and patches for my system, and got some damn good results with several kernels (the best being 2.4.12-ac3-pe (alan cox's patch and pre-emptive kernel patch using alsa on suse 7.3 with gcc 2.96 20000731). i now have a new computer with gentoo linux and alsa 0.9.6, and can only get 16 ms latency with perfect results. same soundcard - m-audio audiophile 2496 (ice1712). i've used kernel 2.4.20 with pe, ll, and some other options, compiling with gcc version 3.2.3 20030422, and i get the same result with all of them (as well as without pe or ll). does anyone know what the problem could be? alsa version? gcc version? kernel version? hardware (eth0 and soundcard share irq - never thought to test without eth0 loaded)? i'd like to get latency under 4 ms. thanks for your input, dave

20 years, 6 months

[linux-audio-user] recording delay in Ardour...

by Aaron Trumm

hello - I think this is a simple question - right now when I record into ardour, there's dang near a half second delay before it actually spits it back out - that delay is reflected in the recording, too - I didn't THINK this was happening yesterday... is this a latency thing? I know I haven't maximized my latency, I'm running the redhat kernel from planet ccrma, not the actual planet ccrma kernel and when I check to see if low latency is turned on, I find that I don't even have a low latency patch :) the weird thing is I SWEAR is wasn't happening yesterday :) -- -------------- Aaron Trumm NQuit www.nquit.com --------------

20 years, 6 months

[linux-audio-user] TK707 0.7 and ALSA 0.9.x ?

by Dave Phillips

Greetings: Has anyone successfully compiled TK707 against recent ALSA ? If so, perhaps you could share the light ? == dp

20 years, 6 months

Re: Re: [linux-audio-user] Midi Keyboard connect error -- can somebody help me ?

by hexe_2003＠directbox.com

-------- directBOX Reply --------------- From: clemens(a)ladisch.de To : linux-audio-user(a)music.columbia.edu Date: 06.10.2003 15:52:02 hexe_2003(a)directbox.com wrote: > ESS-Solo1 MIDI on the ES1938 doesn't work (because ESS' documentation isn't). Get another sound card. Regards, Clemens ----- REALLY ?!??!?!?! Well, that also sounds possible :((((((((((((( baaad :) ; Well, if its true ( I'll check that :) ): THX A LOT !!!! ( I thought something like ' I bought a 89 EUR MIDI-keyboard and it doesn't work ' greez, Sascha Retzki __________________________________________________ Verpassen Sie keine eBay-Auktion und bieten Sie bequem und schnell über das Telefon mit http://www.telefonbieten.de Ihre eMails auf dem Handy lesen - ohne Zeitverlust - 24h/Tag eMail, FAX, SMS, VoiceMail mit http://www.directbox.com

20 years, 6 months

Re: Re: [linux-audio-user] Midi Keyboard connect error -- can somebody help me ?

by hexe_2003＠directbox.com

-------- directBOX Reply --------------- From: holborn(a)telefonica.net To : linux-audio-user(a)music.columbia.edu Date: 04.10.2003 15:16:56 On Sábado, 4 de Octubre de 2003 13:56, hexe_2003(a)directbox.com wrote: > Hello! > > I bought a Midi-Keyboard yesterday and now I'd like to connect it to my > Soundcard. ( ESS-Solo1 , alsa-driven (configured correctly)) > Well, Am I right that I use aconnect to connect my External Midi-Port > (which should be the midi-in port, right?) to my internal FM synth to make > music with rosegarden4 and adour and so on ? > Keyboard "OUT" to Computer "IN" is the way ... then use aconnect. Josep ---------------- Well, I thought exactly the same. Maybe I'll try another way ... Do you know possibilities to connect a MIDI-keyboard to applications via the OSS-layer ? Or can I make something wrong with alsa, too ? I used 'aconnect 64 65' , where 64 is my External MIDI port and 65 is the internal FM synthesizer... . __________________________________________________ Verpassen Sie keine eBay-Auktion und bieten Sie bequem und schnell über das Telefon mit http://www.telefonbieten.de Ihre eMails auf dem Handy lesen - ohne Zeitverlust - 24h/Tag eMail, FAX, SMS, VoiceMail mit http://www.directbox.com

20 years, 6 months

[linux-audio-user] Midi Keyboard connect error -- can somebody help me ?

by hexe_2003＠directbox.com

Hello! I bought a Midi-Keyboard yesterday and now I'd like to connect it to my Soundcard. ( ESS-Solo1 , alsa-driven (configured correctly)) Well, Am I right that I use aconnect to connect my External Midi-Port (which should be the midi-in port, right?) to my internal FM synth to make music with rosegarden4 and adour and so on ? greez Sascha Retzki __________________________________________________ Verpassen Sie keine eBay-Auktion und bieten Sie bequem und schnell über das Telefon mit http://www.telefonbieten.de Ihre eMails auf dem Handy lesen - ohne Zeitverlust - 24h/Tag eMail, FAX, SMS, VoiceMail mit http://www.directbox.com

20 years, 6 months

Re: Re: [linux-audio-user] evolution midi keyboard

by hexe_2003＠directbox.com

-------- directBOX Reply --------------- From: guy.clotilde(a)wanadoo.fr To : linux-audio-user(a)music.columbia.edu Date: 06.10.2003 14:38:27 On Sun, 05 Oct 2003 16:01:21 +0200, hexe_2003(a)directbox.com wrote / a écrit: > Hello again, > > Iam the guy with the Midi-keyboard!! I've heared that some MIDI-keyboards don't > send a note-off event, so they just send another note-on event. I never heard of|used such keyboard. ---------- Well, I also contacted the maintainer of the keyboard, and as it looks like on this list and in the mail of the maintainer, it just could be a driver problem :) ... That is REALLY good ( software is free, we all know :)) ), but .. what is wrong ? Maybe I try the OSS-drivers, but I don't know howto set-up the OSS-drivers with midi ... Could you give me some advices ?? greez, Sascha Retzki __________________________________________________ Verpassen Sie keine eBay-Auktion und bieten Sie bequem und schnell über das Telefon mit http://www.telefonbieten.de Ihre eMails auf dem Handy lesen - ohne Zeitverlust - 24h/Tag eMail, FAX, SMS, VoiceMail mit http://www.directbox.com

20 years, 6 months

Re: Re: [linux-audio-user] evolution midi keyboard

by hexe_2003＠directbox.com

Hello again, Iam the guy with the Midi-keyboard!! I've heared that some MIDI-keyboards don't send a note-off event, so they just send another note-on event. I don't know if mine is such a stupid midi-keyboard, so maybe some guys at lau know it: Evolution MK 149 greez, Sacha Retzki __________________________________________________ Verpassen Sie keine eBay-Auktion und bieten Sie bequem und schnell über das Telefon mit http://www.telefonbieten.de Ihre eMails auf dem Handy lesen - ohne Zeitverlust - 24h/Tag eMail, FAX, SMS, VoiceMail mit http://www.directbox.com

20 years, 6 months

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Linux-audio-user October 2003