Linux-audio-dev

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7513 discussions

[linux-audio-dev] branch-free denormal killer

by Simon Jenkins

Had the idea that you could kill denormals without branching if you didn't mind "injuring" nearby numbers that weren't quite denormal: /* branch-free denormal killer */ inline float FlushToZero( volatile float f ) { f += 9.8607615E-32f; return f - 9.8607615E-32f; } /* end */ This function leaves anything higher than 9.8607615E-32 (ie 2 ** -103) completely unchanged. Numbers below this value lose one bit of precision for each binary order of magnitude they are below it. This has the effect that denormal numbers lose *all* their precision, ie they become zero. Simon Jenkins (Bristol, UK)

21 years, 7 months

[linux-audio-dev] Ann: Specimen v0.1.0 (the first beta release)

by Pete Bessman

Too everyone who's waited with bated breath for this day to come (primarily me), rejoice in the first beta release of Specimen, a midi controlled audio sampler for GNU/Linux systems. Features as listed on the webpage: # ALSA sequencer interface support. # Audio output via ALSA or JACK. # Individual panning and volume controls for each patch. # High quality cubically interpolated pitch scaling. # Sample start/stop and loop points. # Three playback modes; "normal" just plays the sample, "trim" plays the sample and stops early if so instructed, "loop" plays the sample for the requested duration. # Patch bank saving and loading in the "beef" file format. Check out www.gazuga.net for more and to download the source. I'm gonna spend the next few days giving the program a usability test and creating a demo song that does it justice, so keep your ears open for some homegrown UHB in the not-too-distant future. [pb]

21 years, 7 months

Re: [linux-audio-dev] creamcheese

by James W. Morris

creamcheese... little bit twee, perhaps, but, nice and pleasant, definately category C for chilled, reminded me of aphex twins rarer chilled moments. I liked it. But the ending , suffered a little from what I've come up against when I've done tracks, and thats not quite knowing how to end it? leaving it slightly unresolved sounding. But that's after just one listen, so don't take what I say too seriously ;) jwm ~(sirromseventyfive)~ >Would this (http://dis-dot-dat.net/creamcheese.mp3) do for b or c? >The call seems to want classical for category b, so probably c would >fit best. > >If anyone else would like to have a listen, I'd appreciate that very >much. Comments, criticism, cheques are all gratefully accepted :) _________________________________________________________________ Express yourself with cool new emoticons http://www.msn.co.uk/specials/myemo

21 years, 7 months

Re: [linux-audio-dev] creamcheese

by James W. Morris

Sorry, forgot to mention I liked the putch bends too! ~(sirromseventyfive)~ _________________________________________________________________ It's fast, it's easy and it's free. Get MSN Messenger today! http://www.msn.co.uk/messenger

21 years, 7 months

[linux-audio-dev] 2nd LAD conference

by Matthias Nagorni

Hello, as announced earlier, the 2nd Linux Audio Developers conference will take place from 29. April to 2. May 2004 at ZKM (Center for Art and Media), Karlsruhe, Germany. In addition to the "Call for Papers" there is also a "Call for Music". Both are open until 29. February. We are looking for music that has been done with Linux Audio software and intend to present it in a concert at the "Kubus" concert hall of ZKM. "Live" performance with Linux Audio software is welcome as well. More information on the conference, registration, accomodation and the "Call for Music" is available from www.zkm.de/lad The current list of speakers (in alphabetical order) and talks is as follows: Fons Adriaensen, 1) AEOLUS - a church organ in your PC 2) Using JAAA for audio measurements Frank Barknecht, Rapid and Reuseable Audio Development With Pd Julien P. Claassen, Linux console - a textbased studio Paul Davis, Adding MIDI to a Digital Audio Workstation Orm Finnendahl, 1) Linux as a Workstation for Composers 2) PD Workshop Bob Ham, LADCCA Steve W. Harris and Jörn Nettingsmeier, Audio Engineering in a Nutshell Steve W. Harris, JACK, JAMin, Mastering Takashi Iwai, ALSA Sucks? - Trouble Shooting for Your Healthy Music Life Jaroslav Kysela, ALSA project - the last year Victor Lazzarini, Developing Spectral Signal Processing Applications Matthias Nagorni, Introduction to Modular Synthesis Han-Wen Nienhuys, LilyPond, a modular, extensible and programmable compiler for high-quality music notation Dave Phillips, 1) Keynote: One Year After: Notable Linux Audio Development in 2003 2) Still Nailing Jelly: An Update on Linux Audio Documentation Projects Abstracts and links to the respective projects are available at www.zkm.de/lad Matthias -- Dr. Matthias Nagorni SuSE Linux AG Maxfeldstr. 5 phone: +49 911 74053375 D - 90409 Nuernberg fax : +49 911 74053483

21 years, 7 months

[linux-audio-dev] Lionstracs Mediastation, LinuxSampler, Linux at NAMM

by Benno Senoner

Hi, just back from NAMM, just a few infos for the interested people: Lionstracs had a booth demoing a preliminary version of the Mediastation X-76 ( http://www.lionstracs.com ) I've read a thread here about people complaining about the price of the keyboard. ( $12,000). I fully agree, the problem was the distributor trying to ask an exaggerated price. Too many men in the middle (distributor, retailer) each one wants a big cut of the pie while the producer of the actual iron usually earns only a fraction of the price the user pays. But you know since the distributor hosted Lionstracs at his booth you cannot complain about the price they want to set :-) Anyway see Domenico's (Lionstracs head) posting: http://www.lionstracs.com/index.php?name=PNphpBB2&file=viewtopic&t=7 the new price will be around $6200 which is much more in line with current keyboards. AFAIK: Korg's flagship the PA X-Pro is about $4500, add mp3 playback expansion, sample RAM expansion (from 16MB to 32MB :-) ) and you get into the $5000 - $5500 which is comparable to the Mediastation X-76 price but the X-76 much more iron (256 DSP voices vs 64, 512MB sample RAM vs 48MB sample ROM, not to mention what you can do in software with the Athlon 2400+ CPU (LinuxSampler, softsynths, ardour etc). Anyway if you want to see a couple of videos of the Mediastation X-76 in action (with crappy audio since it was taken with a camcorder in the noisy NAMM halls): (the guys were playing the keyboard over an mp3/wav song that ran in the background, changing the sounds interactively (mostly by pressing one single button , eg organ family, and then select organ patch) You can play them with mplayer/xine too but I think you need the win32 codecs installed. Length: 2:22 size 23MB http://www.lionstracs.com/~demos/video/x76smooth1.AVI Length: 4:58 size 48MB http://www.lionstracs.com/~demos/video/x76delmar1.AVI (The GUI at 3:00 in the second video is Paul Davis that tells the keyboarder to shut up with his 120dB noise :-) ) Domenico told me probably they will sell individual parts too so people can build their own keyboard without paying an arm and a leg. (eg case + MIDI keys + LCD , custom VGA with Linux supported GFX chip etc) As said this company tries to be open as possible and its success depends on the success of linux audio too, so I think it's in their interest to support LAD people. For example developers could get discounted keyboards in exchange of code etc, there are many possibilities. Domenico is in talks with Mathias Nagorni about coming at the upcoming ZKM with a Mediastation to show it off and that he can meet developers offer some paid work for developing new apps (or adapt existing ones) for the keyboard etc. BTW: many top engineers of the big 3 keyboards makers came to see the X-76, seemed quite puzzled that a penguin-powered keyboard exists :-) regarding LinuxSampler & NAMM read this: http://sourceforge.net/mailarchive/forum.php?thread_id=3758500&forum_id=127… I was quite surprised about the positive reaction. Other Linux stuff was Plugzilla, a hw expander (a Linux PC) that runs VST plugins (I've meet Marc Lindahl and Joe, very nice people), then there was the Muse Research box which is AFAIK similar to Plugzilla and the Hartmann Neuron was there too but I have not had the time to chat with them. (it is linux powered too but they don't tell you so on their website). ok shutting up :-) cheers, Benno http://www.linuxsampler.org

21 years, 7 months

[linux-audio-dev] TAP plugins (follow-up)

by Tom Szilagyi

First of all, a big thank-you goes to Steve Harris for checking my RDF. Second, tap-0.2.0 is out: * New plugin TAP Scaling Limiter This should be an efficient tool for those who want to maximize the loudness of their mixes without audible artifacts, but can be used for other things as well * Added a Bode diagram of the TAP Equalizer filters to the manual. * Changed versioning from x.y-z to x.y.z. Thanks to Frank Barknecht and others for complaining, and sorry I wasn't aware of this problem. The almost but not completely unmemorizable URL is still: http://www.hszk.bme.hu/~st444/tap/tap.html (but i'm thinking about whether i should put it up on SourceForge...) Tom

21 years, 7 months

[linux-audio-dev] linux 2.6.1 realtime lsm, jackstart & ecasound success

by Eric Dantan Rzewnicki

I just completed a successful run of ecasound with my guitar_mix.ecs (attached) on my new box. This is a 15 minutes 5 track session, 4 tracks from disk, one live jack input. Three outputs: stereo wav, mono wav and live monitor. It uses amplify and panning effects controlled by ecasound generic oscillators. Details on the new box and it's current configuration: asus a7v8x-x athlon XP 2800+ (2071.203 MHz) 1.5GB PC2700 RAM 12GB / /dev/hda2 (actually a 40G disk) 160GB /mnt/audio/ /dev/hdc1 drives tuned 2GB swap /dev/hda1 onboard via8235 (M-Audio Delta-66 w/omni i/o -- still in old box) (ymfpci guillemot maxisound fortissimo -- midi only -- still in old box) debian testing (sarge) 2.6.1 (pre-empt on -- kernel.org sources compiled via make-kpkg) realtime-0.0.2 lsm alsa-1.0.2 (drivers, lib, envy24control, tools) drivers: ./configure --with-isapnp=no --with-sequencer=yes --with-oss=no \ --with-cards=dummy,virmidi,ice1712,ymfpci,via82xx libsndfile-1.0.5 from tar.gz. debian only had 1.0.4 jack-0.94.0 ./configure --enable-capabilities --enable-optimize \ --with-default-tmpdir=/mnt/ramfs/ --disable-portaudio ecasound-2.3.2 ./configure --enable-pyecasound --disable-oss --disable-arts \ --with-largefile I started jackd via jackstart like so: jackstart -v -R -d alsa -d via82xx -r 44100 -p 128 -n 3 I run the ecasound session from a script that does some pre and post processing. It assembles the 4 wav input files from other wav's and cuts the output files down to randomly selected 5 minute chunks, fades in and out the beginnings and ends, normalizes and encodes the stereo wav to ogg. The whole session ran on this onboard soundcard without xruns. I switched desktops numerous times in openbox3 and even switched out of X to tty2 to login and change my hostname back (I had changed it while in X and new apps weren't able to start because they couldn't connect to the display. duh ... 8) ). The session ran flawlessly. I'm not exactly sure what the stats jackd puts out when run verbosely mean, but I know the results I saw mean I'll be able to run this session with many more effects at lower latency than I could on my old box ... _And_ I don't have to do it as root! yay! :) The old box is a PII 400 w/768M PC100 RAM. On that box the whole session including pre and post processing takes around 21 minutes. On the new box that overhead is cut way down with the whole session taking only 16 minutes 20 seconds (only 1 min, 20 more than the actual recording time). While running jackd reports load averaging (just measured visually from jackd output, not hard numbers) around 7.5 with max usecs ~220. On the old box using my delta66 I have to run at -p 256 to avoid xruns in this session, load averages around 22 and max usecs around 1350. Admittedly, much of this performance gain is related to the new hardware. But, still , it's very cool that all this newish stuff (lsm, latest alsa, latest ecasound, latest jackd, 2.6 kernel) is working well In other testing with the via chip I've had jack running as low as -p 32 -n 3 with just a couple jack_metro's connected. I have to go down to -p 16 to get a few xruns. Not until -p 8 do things start to get really bad. /proc/interrupts says the card's on IRQ 4, too. I have a few more things to install, configure and test before I move my delta66 and midi setup over to the new box. But, these initial tests are very exciting. I just had to share. Thank you to all the developers for all this excellent software. And thanks to all the list members, too. :) -Eric Rz. # eric(a)zhevny.com guitar_mix chainsetup file ### general -b:128 -B:rtlowlatency -n:guitar_mix -X -t:902.802 ### audio inputs -a:1,6,11 -i:track1.wav -a:2,7,12 -i:track2.wav -a:3,8,13 -i:track3.wav -a:4,9,14 -i:track4.wav -a:5,10,15 -i:jack_alsa #-a:5,10,15 -f:16,1,44100 -i alsahw,0 ### audio outputs # live output -a:1,2,3,4,5 -f:16,2,44100 -o jack_alsa #-a:1,2,3,4,5 -f:16,2,44100 -o alsahw,0,0 # file outputs ### FIXME: change this output to .ogg when crop and fades work -a:6,7,8,9,10 -f:16,2,44100 -o:/mnt/audio/in_progress/guitar_mix/stereo_out.wav -a:11,12,13,14,15 -f:16,1,44100 -o:/mnt/audio/in_progress/guitar_mix/mono_out.wav ### chain operators and controllers # live output -a:1 -erc:1,2 -epp:0 -kos:1,0,100,0.02,0 -ea:0 -kos:1,0,200,0.01,0 -a:2 -erc:1,2 -epp:0 -kos:1,0,100,0.04,0 -ea:0 -kos:1,0,200,0.02,0 -a:3 -erc:1,2 -epp:0 -kos:1,0,100,0.06,0 -ea:0 -kos:1,0,200,0.03,0 -a:4 -erc:1,2 -epp:0 -kos:1,0,100,0.08,0 -ea:0 -kos:1,0,200,0.04,0 -a:5 -erc:1,2 -epp:50 -ea:205 # stereo file out for .ogg -a:6 -erc:1,2 -epp:0 -kos:1,0,100,0.02,0 -ea:0 -kos:1,0,200,0.01,0 -a:7 -erc:1,2 -epp:0 -kos:1,0,100,0.04,0 -ea:0 -kos:1,0,200,0.02,0 -a:8 -erc:1,2 -epp:0 -kos:1,0,100,0.06,0 -ea:0 -kos:1,0,200,0.03,0 -a:9 -erc:1,2 -epp:0 -kos:1,0,100,0.08,0 -ea:0 -kos:1,0,200,0.04,0 -a:10 -erc:1,2 -epp:50 -ea:205 ### crop and fade in/out ### generate an effects preset file for this in preprocessing #-a:6,7,8,9,10 -ea:0 -kl:1,0,100,4,0,0,10,1,290,1,300,0 # mono file out for pool -a:11 -ea:0 -kos:1,0,200,0.01,0 -a:12 -ea:0 -kos:1,0,200,0.02,0 -a:13 -ea:0 -kos:1,0,200,0.03,0 -a:14 -ea:0 -kos:1,0,200,0.04,0 -a:15 -ea:205 ### crop and fade in/out ### generate an effects preset file for this in preprocessing #-a:11,12,13,14,15 -gc:$pos,300 -ea:100 -klg:0,0,100,4,0,0,10,1,290,1,300,0

21 years, 7 months

[linux-audio-dev] [OT] Numbers, numbers, numbers...

by Rohan Drape

> that's interesting. elk-scheme says about this: > > > (exact? (* 0 440.0)) > #f > > guess something to be fixed, if #t is the R5RS answer... Actually, R5RS says: An operation may, however, return an exact result if it can prove that the value of the result is unaffected by the inexactness of its arguments. For example, multiplication of any number by an exact zero may produce an exact zero result, even if the other argument is inexact. In some environments this sort of thing can be a fast path. This actually is exactly what some people really do not like about R5RS. Personally, the fact that both Stalin and mzscheme actually exist suggests a curious sort of happiness... Regards, Rohan This reminds me of pop music, "I'm no fucking Buddhist, but this is enlightenment"... :?

21 years, 7 months

[linux-audio-dev] alsa sequencer filter client

by Garett Shulman

Hello, I am trying to create a very simple midi filter client for the alsa sequencer based on aseqview-0.1.4. I have alsa 0.9.8. This code shows the input and the output port in aconnect when executed. And, when the raw_midi client is connected The callback does get called when I play keys on my piano. However, Its as though the message is getting sent back to this client and not on to the next client. The process_event function keeps getting called over and over again with the same message when I hit one piano key. It's as though it is sending itself the message. Any Ideas are greatly appreciated. -Garett #include "portlib.h" int process_event(port_t *p, int type, snd_seq_event_t *ev, int *priate_data) { port_write_event(p, ev, 0); } int main() { unsigned int caps = SND_SEQ_PORT_CAP_WRITE | SND_SEQ_PORT_CAP_SUBS_WRITE | SND_SEQ_PORT_CAP_READ | SND_SEQ_PORT_CAP_SUBS_READ; port_client_t *client = port_client_new("MIDI filter", SND_SEQ_OPEN_DUPLEX); port_t *port = port_attach(client, "FILTER port", caps, SND_SEQ_PORT_TYPE_MIDI_GENERIC); int *priv_data; /* add callback */ port_add_callback(port, PORT_MIDI_EVENT_CB, (port_callback_t)process_event, priv_data); port_client_do_loop(client); return port_detach(port); }

21 years, 7 months

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Linux-audio-dev