Linux-audio-dev

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7518 discussions

Re: [LAD] Searching information about: denomals HUGE NaN Inf

by Sampo Savolainen

Quoting Steven Chamberlain <steven(a)pyro.eu.org>: > audio-mobster wrote: > > can someone tell me where I get infomation about: denomals HUGE NaN > Inf? > > Description of denormals etc., and how they're represented in memory: > http://en.wikipedia.org/wiki/IEEE_754#Single-precision_32_bit > > As for tackling denormal issues: > http://music.columbia.edu/pipermail/linux-audio-dev/2003-August/004581.html > http://music.columbia.edu/pipermail/linux-audio-dev/2004-June/008739.html > > The FLUSH_TO_ZERO(x) macro can be seen used in TAP's tap_utils.h The DAZ bit in the processor is often more efficient. See: http://www.intel.com/cd/ids/developer/asmo-na/eng/microprocessors/ia32/pent… For a basic introduction to what denormals are and how they affect the life of music production: http://ardour.org/node/139 Sampo

18 years, 7 months

Searching information about: denomals HUGE NaN Inf

by audio-mobster

Hello, can someone tell me where I get infomation about: denomals HUGE NaN Inf? Thanks in advance Uli

18 years, 7 months

freehand notation system

by Christian Schoenebeck

Hi! Does anybody know a freehand notation system (no matter if free or commercial) beside this one: http://www.freehandsystems.com ? Or do you probably know open source software system(s) that could reach the same features with a *reasonable* low amount of work? CU Christian

18 years, 7 months

[ANN] jack_mixer version 3

by Nedko Arnaudov

jack_mixer version 3 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 2: * Detect NaNs * Dont mix nan sample and next samples in current jack frame (only messed channel) * Show NaNs to user (abspeak goes red and shows NaN) * Reset channel NaN status on abspeak reset * Switch to autotools (prepare for JACK MIDI support) Homepage with screenshots: http://home.gna.org/jackmixer/ Download: http://download.gna.org/jackmixer/ -- Nedko Arnaudov <GnuPG KeyID: DE1716B0>

18 years, 7 months

New Post or what ...

by Jens M Andreasen

Rejected, OK ... Sorry but; Really, this worked the first week after migration, what's up now? Is it that it took me this long to respond to the Berlin-TU event? please, I am an old man and can't move my braincells - let along my email accounts - that fast anymore .. :-D /jens m --

18 years, 7 months

ANN: buzztard-0.2.0 released

by Stefan Kost

hi, The buzztard team has release version 0.2 "sunrise" of its buzz-alike music composer. This version has lots of UI usability improvements, bug fixes, more instant apply settings and introduces some interactivity features (interaction controller and upnp playback controller). The gstreamer extension modules got two new interfaces for presets and help. A Fluidsynth generator plugin has been started. project-page: http://www.buzztard.org screenshots: http://www.buzztard.org/index.php/Screenshots downloads : http://sourceforge.net/project/showfiles.php?group_id=55124 buzztard core developer team -- http://www.buzztard.org

18 years, 7 months

Libraries for simple audio programming, libao, other options?

by Stephen Cameron

Hi, About a week ago, out of boredom, I started working on little retro-styled '80s kind of video game, written in a pretty simple-minded way with gnome, and the graphics done just by using line drawing primitives. It was just something to do, I didn't imagine it would amount to anything. Well, it's turning out surprisingly well (not great, but better than I was expecting.) So now I'm thinking to add sound, but apart from some MIDI programming, I really haven't done any audio programming before (unless you count some Extended BASIC code on a ti99/4a back in the '80s -- and nobody would count that.) So, I found libao ( http://xiph.org/ao/doc/ ) which looks nice and simple, and the sample program I tried ( http://xiph.org/ao/doc/ao_example.c ) worked right off the bat, and the idea of synthesizing my own sounds by constructing waveforms using sine waves is appealing for a retro styled app like mine (though I have no experience doing that and only a vague memory of trigonometry), but I wonder about how to mix sound (add the waveforms, I guess) and construct them on the fly (or trigger pre-computed chunks of audio). In the example code, it plays a one second chunk of audio with one library call initiating the playback. So, I imagine that for a game, in order to satisfy the real-time-ish requirements, I'd instead construct maybe 1/10th or 1/20th second chunks, which would be queued up in my program for playback, and whenever some event happens which demands some sound be produced _right now_ (like the user presses the "fire" button, and so needs some bleeping laser gun sounds to be produced) I would then start adding (arithmetic addition) laser-gun-waveform-data into whatever chunks were already in the queue, and so out would come the sound... Does that seem like a reasonable approach? By chopping the sound up into 1/10t or 1/20th second chunks, am I apt to cause distortion of some kind? Is there some other library I might be better off with? (I looked at SDL, but it seems heavily tilted towards graphics, and I already have the graphics stuff going alright under just regular old gnome.) I might also want to playback some ogg encoded files for maybe prerecorded sound effects and music to be mixed in with the synthesized sound effects. libao won't do that by itself, but I think there are some other libs on xiph.org that do that, but I'm not sure how well they'd accomodate mixing random bits of sound in with them. Saw this: http://www.underbit.com/products/mad/ fixed point mpeg decoder library... Not sure how easy it'd be to mix in other sounds with its output. Maybe just decode into memory buffer. Anyway, just looking for suggestions, esp. if what I've described so far seems wrong. -- steve __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

18 years, 7 months

KeyboardMag

by Jens M Andreasen

Keyboard Magazine carries an article this month about Linux Audio: http://www.keyboardmag.com/story.asp?sectioncode=29&storycode=17973 -8<-------------------------------- You might think there’s no way a free operating system written by volunteers could compete when it comes to music production. But in the past couple of years, all the tools you need to make music have arrived on Linux. [...]

18 years, 7 months

discussing HZ (kernel timer frequency) and midi timing

by Mulyadi Santosa

hello everyone One thing that draws my attention is MIDI playing. So far, by using Timidity and ALSA, I tried to play several MIDI files and it is hard for me to notice any lag. I only noticed delayed notes when system is under busy load (I run CPU bound program with nice level above -9). Things I'd like to discuss are (I am sorry if they sound dumps because I still study all these stuffs): 1. Is it me just who is not professional enough to notice any difference when using various kernel HZ setting (smooth playing on HZ=x, not so smooth when HZ=y and so on)? Or, does the delay fall in non-human-perceptible range thus normal human being can not see the difference? 2. Is it correct that recent ALSA sequencer use RTC as source timer thus kernel HZ is no longer relevant in the sequencer's point of view? 3. Related to the system load I mentioned above, I think I was seeing scheduling latency and not really a timing latency. If that's correct, could you kindly suggest what I must do to show that MIDI timing does have any relation with HZ? 4. I am also thinking about MIDI recording as a way to show HZ effect. Since I don't have any MIDI devices (but I plan to buy one if it's really neccessary), I'd like to explore the correctness of this idea first. Do you think it is really a proper experiment in HZ test context? Thank you in advance for your help and attention and I am looking forward to read your feedback. Sorry if it has been discussed before, but I fail to completely research it until today. regards, Mulyadi

18 years, 7 months

PHASEX-0.10.1

by William Weston

PHASEX-0.10.1 is a buildfix and bugfix release, highly recommended for anyone who currently has 0.10.0. Here's the changelog: * Fixed delay buffer size crash bug. * Rebuilt config.h from configure.ac (fixes undefined PHASEX_DIR). * Added engine thread cancellation point. * Changed order of setting up JACK callbacks (might help jackdmp?) * Moved main sample rate init code from samplerate callback to jack thread. * Fixed oversampling mode. * Fixed typo on bank.c. * Disabled debug output in help.c. * Added --enable-debug= option to configure. * Fixed volume of bassy-plucked-lead and zeroed input boost on all patches. I'm still looking into issues with older versions of GTK-2.x. It looks like the current minimum GTK version is somewhere around 2.6 or 2.8. Most of the non-FC6 build issues appear to be related to this. Reports for SMP, non-FC6, and jackdmp systems would be very helpful, as these are the things I can't test right now. Thank you all for the valuable feedback! I'm already getting a good sense of what's needed most and where things should go in the project roadmap. Based on responses so far, the roadmap up to 0.20.0 should look something like this: 0.11.0 Bugfixes, buildfixes, code cleanups, GUI aesthetic issues. 0.12.0 Rework patch bank system to support alternate patch dirs and include a patch chooser. 0.13.0 LASH support. 0.14.0 Fine-tune threads (remove locks), optimize dsp code more. 0.15.0 New small features and simple GUI enhancements. 0.16.0 Implement LFO clock-sync for MIDI clock and JACK transport. 0.17.0 JACK MIDI support. 0.18.0 Multitimbral or multiple instance support. 0.19.0 Overhaul parameters to add generic ctlr-float conversions and add mod-matrix (w/ velocity and aftertouch handling). 0.20.0 OSC and DSSI support. Cheers, --ww -- /* William Weston <weston(a)sysex.net> */

18 years, 7 months

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Linux-audio-dev