Linux-audio-dev

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7516 discussions

by Sebastian H.

QasMixer version 0.13.0 is now available. QasMixer is an ALSA mixer with a customized Qt GUI. Changes: * Minimize to tray removed - fixes disappearing issue in Gnome * Balloon style tweaks * Balloon closes on click * Balloon icon recognizes wheel events (changes the volume) * Mouse over tray icon raises the balloon * View type toolbar changed to tab selection * Playback/capture toolbar buttons moved to the bottom switches area * Improved widget focus restoring after a channel join/split * Device selection reflects the actual ALSA tree * Simplified settings dialog * Mixer window restores its former size on startup * Overhauled widget painting now uses Cairo (http://cairographics.org) * Multithreaded widget painting (if cairo version supports it) * More graphics reuse for a smaller memory footprint Homepage with more information http://xwmw.org/qasmixer Project page http://sourceforge.net/projects/qasmixer/ Happy volume changing! -- Sebastian Holtermann

14 years, 1 month

Gtk Multilayerd Custom Canvas

by Harry van Haaren

Hey All, I've began redesigning the UI of the project, and I've come up with something that I think is quite nice, using namespaces for the widget drawing fuctions. I'm a touch confused on how to handle things like mouse input (clicks & movement) though. AFAIK Ardour has a custom Gtk::DrawingArea based custom canvas, and I'm intrested in how things like mouse click location & movement propogates trough "layers" of the canvas to the "widget" that needs it... Info appreciated :) -Harry

14 years, 1 month

New ambdec release

by Fons Adriaensen

Hello all, A long due update of ambdec is available at the usual place: <http://kokkinizita.linuxaudio.org/linuxaudio/downloads>. >From the README: * This release supports any format up to full 3rd order, including mixed order schemes such as e.g. 3h1v (W, X, Y, Z, S, T, U, V, N, O, P, Q) and not just 3h1p (W, X, Y, Z, U, V, P, Q). The 'hv' forms are really superior as they preserve azimuth resolution at any elevation, while the 'hp' form is just the sum of a higher order horizontal decoder and a lower order periphonic one. * The matrix and speaker views in the config window have gone. There is really no point in editing high order matrices manually. You can still edit the preset file which uses a textual form of OSC. * The config window shows a graphical representation of the input signals expected by a preset. At least these signal must be provided for correct results. * Spaces in jack port names are accepted. Use either single or double quotes, or escape the spaces as '\ '. * Some new presets, e.g. for a 'cube+faces' (14 speakers) which works great for full 2nd order. Some others have gone. If you need anything specific just ask. * The manual has not yet been updated, but if you used ambdec before you won't need it. Make sure to read the complete README which contains some info on using existing preset files with this release. Enjoy ! -- FA

14 years, 1 month

Fwd: NYT Science: Sound, the Way the Brain Prefers to Hear It

by Niels Mayer

http://www.nytimes.com/2011/09/06/science/06sound.html?_r=1&pagewanted=print --> Dr. Chris Kyriakakis’s audio lab at the University of Southern California --> http://www.audyssey.com/audio-technology/multeq --> http://en.wikipedia.org/wiki/Audyssey_Laboratories Niels http://nielsmayer.com

14 years, 1 month

someone can smash this seq24 bug?

by Renato

Hello, seq24 is affected by this bug: https://bugs.edge.launchpad.net/seq24/+bug/803385 basically with recent versions of jack, when jack transport is enabled, seq24 doesn't start playing. This makes it practically unusable, which is a real pity :( any brave dev want to give him some love? eternal glory will ensue :) cheers renato

14 years, 2 months

jack_session over network

by thijs van severen

hi all are there any plans to extend jack_session support so that it can save a session that spans over 2 (or more) PC's that are connected via the 'net' backend ? grtz Thijs -- follow me on my Audio & Linux blog <http://audio-and-linux.blogspot.com/> !

14 years, 2 months

[LAA] [ANNOUNCE] aj-snapshot-0.9.5 has been released

by Lieven Moors

Hi all, I'm proud to announce another release of aj-snapshot. aj-snapshot is a command line utility to store/restore ALSA and/or JACK connections to/from an XML file This release adds one major feature, which is that aj-snapshot can now run in daemon mode. In this mode, aj-snapshot will restore ALSA and/or JACK connections automatically when clients become available. You can find more info on this feature in the README file, and on the website (sorry, no manpage yet). The addition of this functionality was mostly done by Jari Suominen, and I am very grateful for his help on improving aj-snapshot. As always, there must be bugs, and I would be very glad if you would report them on the sourceforge site. direct download: http://sourceforge.net/projects/aj-snapshot/files/aj-snapshot-0.9.5.tar.bz2… aj-snapshot website: http://aj-snapshot.sourceforge.net/ bug tracker: http://sourceforge.net/tracker/?group_id=311291&atid=1310488 feature requests: http://sourceforge.net/tracker/?group_id=311291&atid=1310491 to clone the git repository: git clone git://gitorious.org/aj-snapshot/aj-snapshot.git

14 years, 2 months

Inter thread Communication: Design Approach

by Harry van Haaren

Hey All, I'm looking to improve a program's design with regards to how it communicates between the "jack" thread and its "main/gui" thread. Please note I'm *not* looking for implementation details like what ringbuffer to use, this has been discussed here before. Conditions: Gui needs to feed data trough to the jack thread (data = parameter moves etc) Jack thread needs to push data (buffers for waveforms & "playhead" info) The real question: What is a neat solution to passing various data trough a ringbuffer? My (hacky?) solution: Create a class, call it "Event". Runtime now looks like so: 1. Create a EventType enum, set the details 2. Write those "Events" into the ringbuffer 3. Switch based on EventType, and handle the event. While not terribly ugly, that Event class starts to get bigger & nastier, so I concidered sub-classing it... but I'm not sure this is going in the right direction. I'm very intrested how the "big" programs around have approached this problem... Cheers, -Harry

14 years, 2 months

IR: Lv2 reverb (without the GUI..?)

by Harry van Haaren

Hey All, I'm faced with a problem that I can't see an easy way around regarding the use of the IR reverb plugin. I'm running the GUI in a seperate *process*, and doing all lv2 communication over OSC. For the most part this is easy, the problem rears its head when one want's to use a plugin whose UI requires "instance-access". Basically, the IR plugin GUI needs access to the Lv2_Handle. But I can't provide that due to the OSC communication. So I've concidered "spoofing" a plugin on the UI side, and keeping it up to date with what the "real" one is doing in the Engine. Bit ugly, and if the UI has instance access, will it still call the normal "port" events..? Because otherwise I'm lost with trying to get at the UI data. The other problem is that loading a "sample" into the IR convolution happens in a pretty strange way: there's 3 Control Input ports, and together they make up a 64bit file hash. I understand the reasons behind this decision, and I'm not trying to criticise the implementation, I'm just not sure how I can send a certain file to these ports to make it work... -Harry

14 years, 2 months

Re: [LAD] Inter thread Communication: Design Approach

by Florian Paul Schmidt

On 09/02/2011 12:54 PM, Pedro Alves wrote: > boost::function<void(void)> serves this purpose for me in jass. To >> create and pass a functor that assigns a new auditor generator to the >> one in the engine, and then tells it to play i do for example: >> >> write_blocking_command(assign(engine_.auditor_gen, p)); >> write_blocking_command(boost::bind(&engine::play_auditor, >> boost::ref(engine_))); assign() is just a utility template to make >> creating functors that do assignments easier.. boost::bind is used to >> make all passed functors 0-ary (e.g for binding member functions to >> their instance or binding arguments to the functor.. and >> write_blocking_command is just a utility function that disables the GUI >> until the acknowledgement from the engine has come back to the GUI,, The >> command ringbuffer is just a ringbuffer holding >> boost::fucntion<void(void)> objects.. >> >> typedef ringbuffer<boost::function<void(void)> > command_ringbuffer; >> >> Examples from here: >> https://github.com/fps/jass/blob/master/main_window.h >> https://github.com/fps/jass/blob/master/assign.h >> https://github.com/fps/jass/blob/master/engine.h Regards, Flo > There are alternatives (even predecessors) to boost.function that > are much faster and avoid the heap/new. See > <http://www.codeproject.com/KB/cpp/fastdelegate2.aspx> for example. > (I used Don's original "Fastest Possible C++ Delegates" on an embedded > project years ago -- worked great). > Oh, thanks for the interesting read :D Flo

14 years, 2 months

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Linux-audio-dev