Linux-audio-dev June 2003

linux-audio-dev@lists.linuxaudio.org

85 participants
85 discussions

[linux-audio-dev] Intervention schedules

by Juhana Sadeharju

Hello. I found an interesting paper on intervention schedules. The author Curtis Abbott worked at Lucasfilm and the paper is only one of the series of papers written by them. Their system had multiple DSP processors and multiple control computers with automation. We are doing similar real-time system in software. In any case, the paper is at "http://www.funet.fi/~kouhia/abbott-ischedules.tar.gz" for a couple of days only as I'm not the copyright owner. Anyone has the following papers. These are also related to my search on prior-art for so called Gigasampler patent. IMHO, we do not need prior art for caching (and keeping) the first part of each audio clip to memory, but there are people who are willing to weaken their open source software volunteerly. J.M. Snell, Professional Real-Time Signal Processor for Synthesis, Sampling, Mixing, and Recording, Preprint No. 2508 (M-4), 83rd Audio Eng. Soc. Convention, New York, 16-19 October, 1987. J. Snell, The Lucasfilm real-time console for recording studios and performance of computer music, Computer Music Journal, 6(3), pp. 33-45, 1982. G.W. McNally, P.J. Bloom, N.J. Rose, Optimizing Audio Data Transfer from Direct Access Media, Preprint No. 2545 (H-4), 83rd Audio Eng. Soc. Convention, New York, 16-19 October, 1987. Best regards, Juhana

21 years, 9 months

[linux-audio-dev] [ANN] QAMix - MIDI controlled Mixer for ALSA

by Matthias Nagorni

Hello, the first version of my new QT based mixer for ALSA is available from: ftp://ftp.suse.com/pub/people/mana/qamix-0.0.1.tar.bz2 The mixer GUI can be configured with an XML description file. Default files are provided with the tarball. See the README for more. At this occasion I would like to also announce QARecord, a simple but multithreaded stereo recording tool for both ALSA and JACK. Version 0.0.9 fixes a bug in the level meters. ftp://ftp.suse.com/pub/people/mana/qarecord-0.0.9.tar.bz2 Have fun ! Matthias -- Dr. Matthias Nagorni SuSE Linux AG Deutschherrnstr. 15-19 phone: +49 911 74053375 D - 90429 Nuernberg fax : +49 911 74053483

21 years, 9 months

RE: [linux-audio-dev] Goodnews

by Cornell III, Howard M

Sorry to hear about your uncle's accident. -----Original Message----- From: Robert Jonsson [mailto:robert.jonsson@dataductus.se] Sent: Wednesday, June 04, 2003 1:50 AM To: linux-audio-dev(a)music.columbia.edu Subject: Re: [linux-audio-dev] Goodnews Good news.... yeah... sure... When I read the title I was hoping for something like: - Kernel 2.6 is tested reliably with 16-samples buffers... or something similar... :-) Oh well, I'll have to settle for the millions then... /R

21 years, 9 months

Re: [linux-audio-dev] latency and P4 hyperthreading?

by Taybin Rutkin

How does the P4 machine compare against itself with hyperthreading turned off? I'm not surprised that hyperthreading is slower than a true dual CPU setup. Two CPUs sharing their cache? That's got to increase cache misses. Taybin -------Original Message------- From: Fernando Pablo Lopez-Lezcano <nando(a)ccrma.Stanford.EDU> Sent: 06/02/03 09:05 PM To: linux-audio-dev(a)music.columbia.edu Subject: [linux-audio-dev] latency and P4 hyperthreading? > > Hi all, has anyone tested latency on a P4 machine with Hyperthreading support? (HT simulates two processors on one processor using - I guess - the spare time available in the cpu when it is waiting for, for example, memory accesses). Anyway, on a: P4 2.4G 800MHz fsb, 875P chipset, 1G ram, Seagate Barracuda V 60G drive: Booting into an smp kernel with HT enabled in the bios (kernel based on 2.4.21-rc6 with the usual low latency, preemptive and full acpi kernel patches) I see both processors, but the latency in the disk tests (using latencytest 0.42) has spikes that go up to 10/15 msecs, specially in the read/write test. If I boot into a up kernel, or if I boot with acpi=off I see only one processor and the latency for the disk tests is fine. Same kernel, same alsa on a dual Athlon MP 1800+ machine does not show any abnormal latency behavior so this seems to be confined to HT machines... :-( I guess "made up" processors are not as good as real ones :-) -- Fernando >

21 years, 9 months

[linux-audio-dev] Goodnews

by johnsonwilliams

Dear Sir, I am BarristerJohnson Williams Solicitor,the Personal Attorney to Mr Mark Dimitris a national of your country, who used to work with shell development company in Nigeria. On the 21st of April 1999, my client,his wife And their three children were in volved in a car accident along Sagamu/Lagos Express Road.unfortunately they All lost their lives in the event of the accident, Since then I have made several enquiries to your Embassy to locate any of in my clients extended relatives, this has also proved unsuccessful.After these several unsuccessful attempts, I decided to trace his relatives over the Internet, to locate any member of his family but tono avail, I contact you to assist me in receiving the money and property left behind by my client before they get confiscated or declared unserviceable by the bank where this huge deposits lodged.Particularly, the Bank where the deceased had an account valued at about $9 million dollars. Conseqently, The bank issued me a notice to provide the next of kin or have the account confiscated within the next ten official working days. since i have been unsuccesfull in locating the the relatives for over 3 years now I seek your consent to present you asthe next of kin of the deceased since you are from the same country so that the proceeds of this account valued at $9 million dollars can be paid to you and then you and me can share the money. 60% to me and 30% to you,while 10% should be for expenses or tax as your government may require.I have all necessary legal documents that can be used to back up any claim we may make. All I require is your honest cooperation to enable us see this deal through. I guarantee that this will be executed under a legitimate arrangement that will protect you from any breach of the law. Please get in touch with me by my email to enable usdiscuss further. Best regards, Barrister Johnson Williams

21 years, 9 months

[linux-audio-dev] Goodnews

by johnsonwilliams

21 years, 9 months

[linux-audio-dev] MVC again

by Juhana Sadeharju

Hello. It is still quite unclear to me how I actually would code the MVC type software. Can anyone give practical hints? Practical examples taken from existing software would be fine too. What open source software uses MVC? Most open source software seems to manipulate the model data in the GUI routines, I see. MVC sure is a great thing, but I would like to see a concrete toolkit or a hint list which helps me in making perfect MVC code immediately. Is it even possible to write a MVC toolkit? What would be in such a toolkit? Best regards, Juhana

21 years, 9 months

[linux-audio-dev] Radium V0.62alpha for linux.

by Kjetil S. Matheussen

***** This is an extremely informal release. The program is not useful yet for linux, but the porting is nearly there. So for anyone interested in looking at, in my opinion, the best :) graphical note-based music editor for any plattform, running in linux, here is a .tar.bz2 file: http://www.notam02.no/radium/bin/radium062_src.tar.bz2 ***** To make it run, cut and paste the following into a terminal: wget http://www.notam02.no/radium/bin/radium062_src.tar.bz2 bzip2 -d radium062_src.tar.bz2 tar xvf radium062_src.tar cd radium062_src cd radium ; ./build.sh cd .. ; make ./start.sh ***** Here is the homepage: http://www.notam02.no/radium/ ***** And here is a screenshot of 0.62 running in linux: http://www.notam02.no/radium/pictures/v062_linux.png (notice the runnning of xlib(editor), qt(fx selector), gtk(midi settings/help) and tk(playlist) simultaniously :)) --

21 years, 9 months

[linux-audio-dev] latency and P4 hyperthreading?

by Fernando Pablo Lopez-Lezcano

Hi all, has anyone tested latency on a P4 machine with Hyperthreading support? (HT simulates two processors on one processor using - I guess - the spare time available in the cpu when it is waiting for, for example, memory accesses). Anyway, on a: P4 2.4G 800MHz fsb, 875P chipset, 1G ram, Seagate Barracuda V 60G drive: Booting into an smp kernel with HT enabled in the bios (kernel based on 2.4.21-rc6 with the usual low latency, preemptive and full acpi kernel patches) I see both processors, but the latency in the disk tests (using latencytest 0.42) has spikes that go up to 10/15 msecs, specially in the read/write test. If I boot into a up kernel, or if I boot with acpi=off I see only one processor and the latency for the disk tests is fine. Same kernel, same alsa on a dual Athlon MP 1800+ machine does not show any abnormal latency behavior so this seems to be confined to HT machines... :-( I guess "made up" processors are not as good as real ones :-) -- Fernando

21 years, 9 months

[linux-audio-dev] Presentation & New project.

by ListBox

Hi to everybody... I'd like to introduce myself to you and to present you my new project. I'm a 26 year old programmer living on the Canary Islands. Unfortunately I'm new to Linux and I've been specializing on Pascar rather than on C. I'm a hobby musician and that's where my idea started. I seek people like me who'd like to help me to assemble a really good studio system with existing aAPIs and peaces of code. Today I uploaded my initial page which explains the project. Please have a look at http://laudio.freehomepage.com/index.html (my page) where I describe the project in detail. Comments are welcome. Thank you & greetz Merlin

21 years, 9 months

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Linux-audio-dev June 2003