Linux-audio-dev August 2007

linux-audio-dev@lists.linuxaudio.org

48 participants
37 discussions

[LAD] [ANN] jack_mixer version 6 "Dance of the headless corpse" released (send again)

by Nedko Arnaudov

jack_mixer version 6 "Dance of the headless corpse" released. jack_mixer is GTK (2.x) JACK audio mixer with look similar to it`s hardware counterparts. It has lot of useful features, apart from being able to mix multiple JACK audio streams. Changes since version 5: * Fix building against jack 0.102.20 * Handle python prefix different from install prefix * Fix LASH-less operation * Update install instructions after lash-0.5.3 and phat-0.4.1 releases * Apply Markus patch (thanks!) for sr #1698 (can't restore session using LASH) Homepage with screenshots: http://home.gna.org/jackmixer/ Download: http://download.gna.org/jackmixer/ -- Nedko Arnaudov <GnuPG KeyID: DE1716B0>

18 years, 5 months

[LAD] New version of nekobee

by Gordon JC Pearce

Bah, trust me to screw up while not concentrating. Link is here: http://www.nekosynth.co.uk/wiki/nekobee ;-) Gordon

18 years, 5 months

[LAD] New version of nekobee

by Gordon JC Pearce

Hi folks I've just released a new tarball of nekobee, my TB-303 plugin for DSSI. Changes between 0.1.5 and 0.1.6 are: * the configure script doesn't look for gtk1.x any more (thanks Juuso Alasuutari) * the release times of the envelopes are tweaked to eliminate an unattractive bloppy noise on note off with certain keyboard controllers * the volume has been reduced to around 1/5 of previous versions (in line with other DSSIs), and an atan() waveshaper has been added to give it a bit of crunch and rein in the excesses of the resonant filter * the filter parameters have been tweaked to more closely reflect the sound of the "18dB/oct" filter in the 303. Try it out, have fun, and let me know if you run into any problems. Or in fact, let me know if you *don't* run into any problems ;-) Gordon

18 years, 5 months

[LAD] [PATCH] lash: robustify alsa-sequencer event reception

by Karsten Wiese

Hi, trying lash-0.5.3 here, weired things happened: I set up a simple project with only 1 lash_synth, the lash_synth was connected to an alsa-sequencer keyboard port and to jack. After saving, closing and restarting that lash-project, the alsa-sequencer connection wasn't restored, until I launched an innocent "aconnect -il" in an other terminal. Funny, no? Reason is I think, that after polling for alsa-seq events, always only 1 event was red via snd_seq_event_input(). Attached patch cures & simplifies things by avoiding the poll() call and using pthread_cancel() to stop the thread. Karsten

18 years, 5 months

[LAD] Embedded linux board

by Florian Schmidt

Hi, i'm kinda sorta in a way planning to build my own effects box. And i'm looking around for embedded boards + cpu's + fpu's which would have the required performance to be able to run some "simple" effects like FreeVerb, some compressor etc (of course with low latency of 16 frames/perdiod or something).. Any hints/suggestions? Regards, Flo P.S.: I was looking at this baby: http://www.glomationinc.com/product_9302E.html For 65$ (ca. 50 euros) it looks lie a bargain, but it seems its FPU is supported by gcc only with a patch. And i'm also not sure how much processing power this MaverickCrunch has [FLOP numbers are hard to find].. -- Palimm Palimm! http://tapas.affenbande.org

18 years, 5 months

[LAD] Re: Embedded linux board

by Ben Loftis

The Epia 5000 soundcard works at low latencies, but the sound quality is not very good. The M-series has "decent" onboard sound. I think it has less to do with the digital side than the analog... the M-series has more "oomph". I'd try the 600 MHz fanless version. It should be plenty of horsepower to do stomp box processing. It's been out a long time; everything should work right out of the box with any recent distro. Tell us how it goes, Florian! -Ben Loftis

18 years, 5 months

Re: [LAD] Reverbs (Re: Pluginization example?)

by Juhana Sadeharju

>From: Arnold Krille <arnold(a)arnoldarts.de> > >> Next I will attempt to write a nonlinear reverb. Useful for >> drums and vocals as well. Something new if nobody already has >> written one. > >Like the TAP Reverberator? Which has several different engines/methods... No, I don't think so. TAP Reverberator looks like old comb/allpass reverberator. The reverbs I'm refering to were responsible for the familiar drum reverbs 20 years ago. Juhana -- http://music.columbia.edu/mailman/listinfo/linux-graphics-dev for developers of open source graphics software

18 years, 5 months

[LAD] Reverbs (Re: Pluginization example?)

by Juhana Sadeharju

Hmm... I noticed CAPS plugins already have the Dattorro's plate reverb. It is the vocal reverb I implemented now, as I thought there was an urgent need for one. Does nobody use CAPS plate reverb for vocals? Its design is of Lexicon type!! However, I added early reflections and I'm prepared to write true stereo-to-stereo version (CAPS is simply summing left and right channels to mono). Next I will attempt to write a nonlinear reverb. Useful for drums and vocals as well. Something new if nobody already has written one. Juhana -- http://music.columbia.edu/mailman/listinfo/linux-graphics-dev for developers of open source graphics software

18 years, 5 months

[LAD] Pluginization example?

by Juhana Sadeharju

I have now written a vocal reverb. It needs a pluginization. An example would do fine but the example must be exactly what I need, otherwise it may just confuse me. Latest plugin stuff, of course. Unlike GVerb, the new reverb has a preset structure. The reverb is initialized this way: effect = effect_new(config_ptr,preset_ptr); The preset structure can be modified during the processing by switching the pointer or by modifying the parameters in the structure. The audio is processed by calling effect_do(effect, input_array, count, outleft_array, outright_array); I'm also glueless with the following: 1. Denormalization. Feeding noise at the reverb input would save me trouble of finding all places where the problem occurs, but is this wise? How to generate the proper noise? 2. Effect modulation is done by two extra arrays at effect_do( ..., mod1_array, mod2_array, ...) They should be filled with slowly varying sin() signals, but how to do it efficiently? I have used earlier the sin() call. 3. The audio is divided to blocks of N samples. Apparently I should interpolate the tweaked parameters over the N samples inside the reverb, or I should provide arrays for all parameters and leave the interpolation to the plugin wrapper. Juhana -- http://music.columbia.edu/mailman/listinfo/linux-graphics-dev for developers of open source graphics software

18 years, 5 months

[LAD] new lossless/lossy audio compressor

by Gregory Alan Hildstrom

Hello. I just finished writing and documenting a new lossless and lossy audio codec called j2kaudio. It uses the wavelet compression in JPEG 2000 to transcode audio wav data to and from j2a files. I have not written any sort of media player plugin yet; more testing and file format refinement are necessary first. I tested with 44100Hz, 16-bit, stereo CD-quality wav files, but it also supports other sample rates, precisions, and channel numbers. I tested against flac, lpac, shorten, and monkey's audio for lossless encoding. j2kaudio beat the nearest competition by over 10%. If anyone is motivated to test some additional songs, provide me with additional test data, or suggest another untested codec, please let me know. http://geocities.com/hildstrom/projects/j2kaudio/index.html Let me know what you think. Thanks. -Greg Gregory Alan Hildstrom Secure Systems Engineer - Trusted Computer Solutions trustedcs.com ghildstrom(a)trustedcs.com Software Engineer - Hildstrom Engineering geocities.com/hildstrom hildstrom(a)yahoo.com Mobile:(210)413-6082 Fax:(210)599-0469 Office:(210)340-3151x117

18 years, 5 months

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Linux-audio-dev August 2007