Linux-audio-dev

linux-audio-dev@lists.linuxaudio.org

7516 discussions

by james morris

Hi, I'm trying to build AMS, but ./configure can't find clalsadrv and I can't find where to download the source for it. I've already built from source: alsa-driver-1.0.20 alsa-tools-1.0.20 alsa-plugins-1.0.20 alsa-lib-1.0.20 can anyone tell me where clalsadrv is? Cheers, James.

16 years, 1 month

Tracing malloc() and mutex usage in realt-time software

by Lennart Poettering

Heya! Not sure if anyone of you already read this announcement about my mutex profiler "mutrace" I wrote a couple of days back: http://0pointer.de/blog/projects/mutrace.html Since I wrote that blog story I have added a couple of features to mutrace that are particularly relevant when developing real-time applications. I'd like to draw your attention to these, since this might be of some interest for the audio community. "mutrace -r" can be used to track down any mutex usage in real-time threads. As everyone probably knows it's a good idea to abstain from mutex usage entirely in RT threads. However, actually doing that is not always realistic, and sometimes the more complex your project gets the harder it becomes actually making sure that no hidden mutex usage creeps into your program. Too verify lock-freeness or track down the culprits you may use "mutrace -r". It will tell you not only if am RT thread used a mutex, it will also tell you how often it was contended and how often it changed ownership (i.e. how big the risk of contention is even if it didn't contend in the specific run.) In addition it will show you the mutex protocol, so if you are using a mutex from an RT thread and really cannot do without it, you can at least make sure it is a PRIO_INHERIT mutex, And there's also now a second tool called "matrace" in the tarball that tracks down malloc() usage from RT threads. It's a very simple tool, which just catches the memory allocations/frees, checks the scheduling and complains if necessary. With these two tools two of the biggest donts in RT programming may be tracked down: use of mutexes and use of malloc. How does the output look like? As an example I simply ran jackd through mutrace -r and matrace, for 10s without doing anything else. The result for mutrace you may find here: http://0pointer.de/public/mutrace-jackd.txt (The interesting table is at the end, so scroll down) Not sure what to make of this, as I don't know the Jack internals too well. However mutrace reveals that at least one mutex was used from an RT thread and even contended. Moreover that mutex was not PRIO_INHERIT. And here's matrace: http://0pointer.de/public/matrace-jackd.txt Seems free() is called a couple of times from an RT thread. These might, or might not be problems. The tools can just inform you what is done. If there's something to fix is up to the eye of the beholder. Get the tool here: http://git.0pointer.de/?p=mutrace.git Have fun, Lennart -- Lennart Poettering Red Hat, Inc. lennart [at] poettering [dot] net http://0pointer.net/lennart/ GnuPG 0x1A015CC4

16 years, 1 month

alsa deprecated code

by Victor Lazzarini

Does anyone know anything about this change in alsa: warning: snd_pcm_sw_params_set_xfer_align is deprecated (declared at /usr/include/alsa/pcm.h:1115) I just wanted to check background before fixing the code. Regards Victor

16 years, 1 month

[ANN] LADI Session Handler - Preview 1

by Nedko Arnaudov

The first milestone is reached and result is a tarball that brave souls may want to download and try. It contains implementation of JACK multiconfig functionality. JACK server settings can be saved as part of a studio. Then, loading studio will cause JACK settings stored as part of the studio to be restored. Build will produce three operational components: * ladishd - The daemon, a D-Bus service * gladish - GTK GUI interface * ladish_control - Command-line interface In the tarball you will also find bundled suitable (latest and gratest) flowcanvas and LADI Tools. Download: http://ladish.org/download/ladish-0.1.tar.bz2 http://ladish.org/download/ladish-0.1.tar.bz2.sig Homepage: http://ladish.org/ Roadmap: http://ladish.org/roadmap --------------------------------------------------------------------- LADI Session Handler or simply ladish is a session management system for JACK applications on GNU/Linux. Its aim is to allow you to have many different audio programs running at once, to save their setup, close them down and then easily reload the setup at some other time. ladish doesn't deal with any kind of audio or MIDI data itself; it just runs programs, deals with saving/loading (arbitrary) data and connects JACK ports together. It can also be used to move entire sessions between computers, or post sessions on the Internet for download. ladish has GUI frontend, gladish, based on lpatchage (LADI Patchage) and the ladish_control command line app for headless operation. LADI Tools is set of apps that interface with ladish, JACK server and a2jmidid ladish requires D-Bus and JACK compiled with D-Bus support. LADI Session Handler is rewrite of LASH. Project goals: * Save and restore sets of JACK (audio and MIDI) enabled applications. * Provide JACK clients with virtual hardware ports, so projects can be transfered (or backups restored) between computers running different hardware and backups. * Don't require session handling library to be used. There is no need of such library for restoring connections between JACK clients. * Flow canvas based GUI. Positions of elements on the canvas are saved/restored. * Allow clients to use external storage to save its state. This includes storing internal state to non-filesystem place like memory of a hardware synth. This also includes storing client internal state (client project data) in a way that is not directly bound to ladish project. * Import/export operations, as opposed to save/load. Save/load operate in current system and may cause saving data outside of project itself (external storage). Import/export uses/produces "tarball" suitable for transferring session data over network to other computer or storing it in a backup archive. * Hierarchical or tag-based organization of projects. * List of JACK applications. Applications are always started through ladish to have restored runtime environment closer to one existed before project save. * Distributed studio - network connected computers. Netjack configuration is part of the studio and thus is saved/restored. * Collaborate with the X11 window manager so window properties like window position, virtual desktop and screen (multimonitor) are saved/restored. -- Nedko Arnaudov <GnuPG KeyID: DE1716B0>

16 years, 1 month

[ANN] QXGEdit 0.0.1 released!

by Rui Nuno Capela

Ten years after, nothing to do with Alvin Lee's but one by-product of this über-procrastinator of yours truly :) here goes one more strike to the Linux Audio ecosystem. Rather an almost forgotten niche nowadays, I cannot let this rot in my hard disk. There it is, a XG Editor for the masses, at least the ones who love gems like the Yamaha DB50XG [3], a precious old piece of hardware that I do strive and joy (pun intended). If, by this time you don't have the slightest idea of what I'm talking about [4], move on, there's nothing to see here. This is strictly pure nineties memorabilia but one of the finest pieces of junk you could rig into a PC and turn it on a full-fledged rave machine. Do you remember the days? Awe my 8) Now that you're following in tune (probably you already googled around) you may reckon that XGEdit95 and XG-Gold are two fine examples of the same subject. More than fine, both do excel in their purpose. There were the high times of shareware (I've told you before, this is memorabilia:) ... yeah right. Enter QXGEdit. While both of the former may drink the young wine [5] just fine, it has been my prerogative doing things my own way. Linux straight. How could it be any other way? Truth is, this bastard has been slugging on my attic far too long, but this late summer it has revived to a new life. Time to bring it down and share. Provided theres still enough interest on the scene ;) QXGEdit 0.0.1 released! Website: http://qxgedit.sourceforge.net Project page: http://sourceforge.net/projects/qxgedit Downloads: - source tarball: http://downloads.sourceforge.net/qxgedit/qxgedit-0.0.1.tar.gz - source package (openSUSE 11.1): http://downloads.sourceforge.net/qxgedit/qxgedit-0.0.1-1.rncbc.suse111.src.… - binary package (openSUSE 11.1): http://downloads.sourceforge.net/qxgedit/qxgedit-0.0.1-1.rncbc.suse111.i586… http://downloads.sourceforge.net/qxgedit/qxgedit-0.0.1-1.rncbc.suse111.x86_… - binary package (Ubuntu 8.04 LTS): http://downloads.sourceforge.net/qxgedit/qxgedit_0.0.1-1.rncbc.ubuntu804_i3… - binary package (Ubuntu 9.04): http://downloads.sourceforge.net/qxgedit/qxgedit_0.0.1-1.rncbc.ubuntu904_i3… Weblog (upstream support): http://www.rncbc.org License: QXGEdit is free, open-source software, distributed under the terms of the GNU General Public License [6] (GPL) version 2 or later. Requirements The software requirements for build and runtime are listed as follows: Mandatory: [1] Qt4 (core, gui), C++ class library and tools for crossplatform development and internationalization http://www.qtsoftware.com/qt/ [2] ALSA, Advanced Linux Sound Architecture http://www.alsa-project.org/ References: [3] http://www.yamaha.com/yamahavgn/CDA/ContentDetail/ModelSeriesDetail.html?CN… [4] http://www.soundonsound.com/sos/1996_articles/may96/yamahadb50xg.html [5] http://www.winehq.org [6] http://www.gnu.org/copyleft/gpl.html Enjoy. -- rncbc aka Rui Nuno Capela rncbc at rncbc dot org http://www.rncbc.org

16 years, 1 month

phasex-0.12.0-beta4

by William Weston

Greetings, Thank you for all your great feedback on the last two betas! phasex-0.12.0-beta4 addresses all of the concerns brought up so far: Velocity: Many of you have noticed that velocity and aftertouch were completely unsupported. Now, velocity (with aftertouch) can be mapped to directly to oscillators and LFOs (by setting the source), used as a modulation source (adjust volume w/ AM or pitch w/ FM), or mapped to the filter in the filter-lfo section. GUI: Some of you mentioned that the colors were too dark with too little contrast, so now there are four GTK theme options: Dark (original purple background), Light (orange background), System (use the system GTK theme), and Custom (choose any gtkrc file for your theme). There have also been issues with getting phasex to fit on small screens (usually netbooks). The knob images have been trimmed down vertically (just blank pixels), and the padding between widgets has been almost completely cut out. The font can be selected in the preferences. Additionally, a true fullscreen mode has been added. It is now possible to fit phasex into an 800x600 desktop. Atom processors: Compiler optimization flags for the Intel Atom processors have been added to the build system. Run './configure --enable-arch=atom' to build for the Atom. To force 32- or 64-bit builds, use 'atom32' or 'atom64'. The rest is just small tweaks and bugfixes, such as fixing the segfault on quit issue, fixing all the compiler warnings, minor updates to the build system, new menu items, etc. As I don't have access to a netbook right now, please let me know how it works out with the Atom or other low-power CPU, or on any machine with a screen smaller than 1024x768. Of course, feedback from the rest of you is highly welcome, too ;-} Visit http://sysex.net/phasex/beta for source tarball, Fedora 11 RPMS, or Fedora 8 RPMS. Cheers, --ww

16 years, 1 month

Any serious user base in France ?

by Maurizio De Cecco

Hallo, This is a serious question for Linux Audio and in general multi media applications developers. I am in the program committee of the conference part of a Linux related even in france (called Salon Linux), and we are discussing about the 2010 conference program. I may be in the condition to have a Audio or multi media subject added, but i can do that only if i have serious evidence of a user base or a developer base in france. Most of the subjects are around enterprise and industrial development. The conference is strictly french-speaking, and the access is not for free (even if the organisation is stricly on a volunteer base). So, any French developers here, and any evidence of a French user base ? Maurizio De Cecco -- Music: http://www.myspace.com/mauriziodececco Blog: http://maurizio.dececco.name/ Software: http://www.jmax-phoenix.org/

16 years, 1 month

Real time Audio Analysis similar to sonic visualizer

by Nathanael Anderson

I'm looking for some real time audio analysis software similar to the melodic range spectrogram in sonic visualizer. Instead of visual output though, I'm looking for midi output (this can be rough, i'm not going to be generating audio from it, just trying to check if said notes were played). I'm not sure if this is possible with clam, I've used it a little, but not much. The ideal solution will be multiplatform. Thanks for any leads, Nathanael

16 years, 2 months

pyqt vs wxpython for audio apps?

by Iain Duncan

Hi everyone, I'm wondering what most linux audio developers think about pyqt vs wxpy for writing audio app guis now that qt is gpl'd. Specifically I'm interested in tightly controlling the timing of event loop ( ie making some accurate external clock source like the csound engine be the time boss ) and making decent faders widgets. thanks! iain

16 years, 2 months

Thanks: sooperlooper + JACK

by Gabriel M. Beddingfield

Hey guys, I had a performance the other day with a nicely underpowered PC (500 MHz). One man show. Everything being run through JACK (guitar + vocals), using sooperlooper, and jack rack plus some nice TAP effects (for vocals). Set up for 10ms latencies. Not long into it I looked at the computer and saw the hard drive light was very bright. Great. My computer is running updatedb... _now_??? This is bad. Since I was doing something slightly different... I really couldn't afford any glitches. So, I was a little nervous. But I trudged along. No crashes. No xruns. No clicks. No problems. So, I'm taking a moment to say: Thanks, everybody. Peace, Gabriel

16 years, 2 months

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Linux-audio-dev