Linux-audio-dev September 2003

linux-audio-dev@lists.linuxaudio.org

94 participants
75 discussions

[linux-audio-dev] Streaming compressed audio from the network

by Juhana Sadeharju

Hello. If I understood correctly, several companies are wanting patent royalties for streaming compressed audio from the network. Take a look at mpg321 (GPL clone of mpg123): Usage: mpg123 [options] file(s) | URL(s) | - So, this playing from the network URLs is no no, or what? What other software are able to play a compressed audio from the network? Juhana

21 years, 6 months

[linux-audio-dev] next power of two

by Maarten de Boer

Hi, A colleague of mine found this very clever algoritm to calculate the next power of two for a given number. It comes from the Prophecy SDK for 3d game development http://www.twilight3d.com/modules.php?op=modload&name=Downloads&file=index Since this is a kind of thing often needed in audio processing, I wanted to share it with you. I certainly can not think of a faster (or more elegant) way of doing it. Maarten ////// /// Returns the closest power-of-two number greater or equal /// to n for the given (unsigned) integer n. /// Will return 0 when n = 0 and 1 when n = 1. ////// inline uint32_t nextPowerOfTwo(uint32_t n) { --n; n |= n >> 16; n |= n >> 8; n |= n >> 4; n |= n >> 2; n |= n >> 1; ++n; return n; }

21 years, 6 months

Re: [linux-audio-dev] next power of two

by Taybin Rutkin

Heh, that doesn't sound very RISC-like to me... Taybin -----Original Message----- From: Maarten de Boer <mdeboer(a)iua.upf.es> Sent: Sep 18, 2003 7:41 AM To: linux-audio-dev(a)music.columbia.edu Subject: Re: [linux-audio-dev] next power of two By the way, it seems the PPC has instructions to do it. >From the "PPC compiler writers guide": Round Up or Down to Next Power of 2 The floor power of 2 ( flp2) and ceiling power of 2 ( clp2) functions are similar to the floor and ceiling functions, respectively, but they round to an integral power of 2, rather than to an integer.

21 years, 6 months

[linux-audio-dev] more practical stuff about synth-programming -- jack seems to be less documentated

by hexe_2003＠directbox.com

( This email is a reply to one of my threads; but I deleted the originally mail, so I open another; to original thread asked you for some background information about pcm-data ...) hi, First I want to thank you for the ideas ( http://www.dspguide.com ; http://www.amazona.de ) ; and well, I am from Germany, so German articles are not bad :) But both are very theoretically. Both are very good, both are very interesting. I've not even finished both completely, because its much information you gave me... I'll see what I can really use in my little programme... . If you know something interesting stuff to programm a software (!) synthesizer, let me know :) . Somebody of this list said to me that "it would be much easier for me to use jack" . Well, I did not find ANY developer-documentation on the originally HP and I want to know if jack already HAS an easy-to-programm software synth implemented; If yes, where can I find further information ? ( I know that some of my questions could be answered by google, but I ALWAYS give it the wrong keywords :)) ) Greetz, 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

21 years, 6 months

[linux-audio-dev] lowlatency test at linuxdevices

by Robert Jonsson

Hi, First I must admit right away, I only looked at the pretty pictures so far, but they where sufficiently nice for me to post it here ;-P. http://linuxdevices.com/articles/AT7751365763.html /Robert

21 years, 6 months

RE: [linux-audio-dev] next power of two

by Hannes Guddat

Very interesting, "in the name of all DSP programmers" - thanksalot! Do you have any estimation how many cycles this would spend on a pentium? I would have make a wild guess of about 16-21 cycles + call overhead (if not inlined).. Hannes P.S. Maybe you have similar code for the "bitreverse" operation.. ? just asking.. :) // // we apologize for the inconvenience // // Hannes Guddat // Fraunhofer IGD // A9 - Communication and Cooperation // Rundeturmstrasse 6 // 64283 Darmstadt // // Tel.: +49 6151 155-217 // Fax.: +49 6151 155-559 // > -----Original Message----- > From: linux-audio-dev-admin(a)music.columbia.edu > [mailto:linux-audio-dev-admin@music.columbia.edu]On Behalf Of > Maarten de > Boer > Sent: Mittwoch, 17. September 2003 14:22 > To: linux-audio-dev(a)music.columbia.edu > Subject: [linux-audio-dev] next power of two > > > Hi, > > A colleague of mine found this very clever algoritm to calculate the > next power of two for a given number. It comes from the > Prophecy SDK for > 3d game development > http://www.twilight3d.com/modules.php?op=modload&name=Download > s&file=index > > Since this is a kind of thing often needed in audio > processing, I wanted > to share it with you. I certainly can not think of a faster (or more > elegant) way of doing it. > > Maarten > > ////// > /// Returns the closest power-of-two number greater or equal > /// to n for the given (unsigned) integer n. > /// Will return 0 when n = 0 and 1 when n = 1. > ////// > inline uint32_t nextPowerOfTwo(uint32_t n) > { > --n; > n |= n >> 16; > n |= n >> 8; > n |= n >> 4; > n |= n >> 2; > n |= n >> 1; > ++n; > return n; > } >

21 years, 6 months

[linux-audio-dev] [ANN] Gungirl Sequencer 0.1

by Richard Spindler

Hi, this is the first Release of My new Linux Audio Sequencer. Gungirl Sequencer is an easy to use Audiosequencer. It includes a simple Filemanager and uses Drag & Drop to arrange Audiosamples. For more Information see http://homepage.uibk.ac.at/~csad2715/ggseq/

21 years, 6 months

[linux-audio-dev] pcm data -- plz give a short brief

by hexe_2003＠directbox.com

Good morning, I was looking for a good paper (tutorial / documentation) that describes howto calculate pcm data -- e.g. if I open my sounddevice (/dev/dsp), and sent randomed data to it, I am not really satisfied; I want to KNOW what data makes what sound. Of course I know that this is a short describtion of a whole lot of knowledge, but browsing the archive of http://www.musicdsp.org is a very hard way to REALLY learn how this works. Have somebody an idea where to begin ? greetz, 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

21 years, 6 months

[linux-audio-dev] 2nd LAD conference - Call for papers

by Matthias Nagorni

Dear all, as announced earlier on this list, the 2nd LAD conference will take place April 29th - May 2nd 2004 at ZKM (Zentrum fuer Kunst und Medientechnologie, Center for Art and Media) Karlsruhe, Germany. http://www.linuxdj.com/audio/lad/eventszkm2003.php3 lists presentation material and reports of the 1st conference. See http://www.linuxdj.com/audio/lad/eventszkm2004.php3 for more information on the 2nd conference. Many participants of the 1st conference have already confirmed their participation for the 2nd one. Frank and I would now like to collect abstracts for planned talks so that we can set up a preliminary program. We would like to have this available as soon as possible so that we can advertise the event in computer music journals (such as german Keyboards ;-) and linux journals (Dave, Daniel, are you listening ?). If you plan to give a talk on Linux audio development or do a presentation of music you have done with Linux software, please send an abstract to both me and Frank Neumann (Frank.Neumann_AT_st_DOT_com). Please estimate the time you need for your talk so that we can set up a preliminary schedule. We have now three different locations for presentations: The lecture hall we used for the 1st conference, some seminar rooms and the Kubus, which is considerable larger than the lecture hall and has a built-in studio. The seminar rooms can be used for LAD internal presentations and discussion. The Kubus is ideal for presentations of high public interest, especially practical demonstrations of audio software. The lecture hall will be used for technical talks on software development. In short terms: Kubus is LAU, Lecture hall is LAD. More rooms imply the option of scheduling parallel sessions. We can only decide on this after we know roughly how many presentations are to be expected. This is another reason why early registration is helpful. Given the excellent conditions at ZKM and the many improvements of Linux audio software, the second conference promises to be even more successful than its predecessor. Matthias -- Dr. Matthias Nagorni SuSE Linux AG Deutschherrnstr. 15-19 phone: +49 911 74053375 D - 90429 Nuernberg fax : +49 911 74053483

21 years, 6 months

[linux-audio-dev] WINNING NOTIFICATION

by luckywinnersagent＠survivormail.com

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21 years, 6 months

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Linux-audio-dev September 2003