Linux-audio-dev

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3 participants
7535 discussions

by Thijs van severen

Hi all i'm trying to sync arpage (jack synced arpeggiator) to Hydrogen: in hydrogen i enabled jack transport + set hydrogen as master Arpage gets triggered when i hit play in hydrogen, but it does not do what i expect it to do (the tempo is all 'weird') if i do the same with qtractor, ardour or the jack_transport utility as jack master everything works as expected now i'm trying to find an easy way to see if there is any difference between the way hydrogen and the other apps start/stop/'master' the jack transport, but so far i cant see any difference is there any app/utility that can give me detailed info about jack transport ? i have logged a ticket (including a screen recording @ bottom of the ticket) of this strange behavior : https://github.com/hydrogen-music/hydrogen/issues/81 any tips ? grtz Thijs -- follow me on my Audio & Linux blog <http://audio-and-linux.blogspot.com/> !

12 years, 11 months

[LAD] JACK and CPU stress testing

by Harry van Haaren

Hey all, I'm currently attempting to stress test my setup of -rt kernel, rtirq scripts, and a Jack client program I've been working on. So my idea is to create a script that runs the programs, and also a cpu-load generating program (cpuburn or alternative). Then collecting stats based on Xruns, % DSP load, etc. I intend to show (trough brute force) that an application is RT capable on machine X with a latency of Y ms. Of course this won't be 100% representative, but the stats will show some RT-safe-ness. Has anybody done this kind of profiling / stress testing with JACK before? Hints / tips / advice / etc welcomed! -Harry

12 years, 11 months

Re: [LAD] Floss alternative to red5

by Jonathan Woithe

> On 02/26/2013 11:40 PM, APO33 wrote: > > The idea is that the final user will stream his sound and video with his > > browser and everyone could see/hear him and do the same via their browser. > > Did you already take a look at the possibilities of WebRTC? > http://www.html5rocks.com/en/tutorials/webrtc/basics/ There was also a presentation by Silvia Pfeiffer at linux.conf.au about the use of WebRTC to do non-centralised video conferencing. It was at 10:40 in MCC3 on Wednesday if you are looking at the program at http://lca2013.linux.org.au/programme/schedule At some point the videos and slides will be linked to this, but in the meantime the abstract can be found here: http://lca2013.linux.org.au/schedule/30040/view_talk?day=None The video is currently available at http://mirror.linux.org.au/linux.conf.au/2013/ogv/Code_up_your_own_video_co… or other formats (webm, mp4) at http://mirror.linux.org.au/linux.conf.au/2013/ Regards jonathan

12 years, 11 months

[LAD] [ANN] Vee One Suite 0.3.2 - One third bug-fix release

by Rui Nuno Capela

hi again, as they use to say--'round here at least--there's no second without a third. So there it goes, yet another batch for the Vee One Suite of old-school software instruments being thrown out to the wild. Usual suspects include synthv1 [1], a polyphonic synthesizer, samplv1 [2], a polyphonic sampler and drumkv1 [3], a drum-kit sampler. same as before, they come in a duality of forms: - a pure stand-alone JACK client with JACK-session and both JACK MIDI and ALSA MIDI input support; - a LV2 instrument plugin. now, the (boring) bill of changes follows: - pitch-bend, modwheel and LFO pitch range internal fixes. - LV2 state save flags now forced to be portable POD. - sustain/damper pedal switch (MIDI CC#64) support added. (synthv1, samplv1) - color palette hack on Qt5 dark themes. (TESTING) all free, open-source Linux Audio software, distributed under the terms of the GNU General Public License (GPL) version 2 or later. enjoy && have fun! [1] synthv1 - an old-school polyphonic synthesizer synthv1 is an old-school all-digital 4-oscillator subtractive polyphonic synthesizer with stereo fx. LV2 URI: http://synthv1.sourceforge.net/lv2 website: http://synthv1.sourceforge.net downloads: http://sourceforge.net/projects/synthv1/files - source tarball: http://download.sourceforge.net/synthv1/synthv1-0.3.2.tar.gz - source package: http://download.sourceforge.net/synthv1/synthv1-0.3.2-9.rncbc.suse122.src.r… - binary packages: http://download.sourceforge.net/synthv1/synthv1-0.3.2-9.rncbc.suse122.i586.… http://download.sourceforge.net/synthv1/synthv1-0.3.2-9.rncbc.suse122.x86_8… [2] samplv1 - an old-school polyphonic sampler samplv1 is an(other) old-school all-digital polyphonic sampler synthesizer with stereo fx. LV2 URI: http://samplv1.sourceforge.net/lv2 website: http://samplv1.sourceforge.net downloads: http://sourceforge.net/projects/samplv1/files - source tarball: http://download.sourceforge.net/samplv1/samplv1-0.3.2.tar.gz - source package: http://download.sourceforge.net/samplv1/samplv1-0.3.2-9.rncbc.suse122.src.r… - binary packages: http://download.sourceforge.net/samplv1/samplv1-0.3.2-9.rncbc.suse122.i586.… http://download.sourceforge.net/samplv1/samplv1-0.2.2-9.rncbc.suse122.x86_8… [3] drumkv1 - an old-school drum-kit sampler. drumkv1 is (yet) an(other) s an old-school all-digital drum-kit sampler synthesizer with stereo fx. LV2 URI: http://drumkv1.sourceforge.net/lv2 website: http://drumkv1.sourceforge.net downloads: http://sourceforge.net/projects/drumkv1/files - source tarball: http://download.sourceforge.net/drumkv1/drumkv1-0.3.2.tar.gz - source package: http://download.sourceforge.net/drumkv1/drumkv1-0.3.2-5.rncbc.suse122.src.r… - binary packages: http://download.sourceforge.net/drumkv1/drumkv1-0.3.2-5.rncbc.suse122.i586.… http://download.sourceforge.net/drumkv1/drumkv1-0.3.2-5.rncbc.suse122.x86_8… see also: http://www.rncbc.org/drupal/node/617 cheers! -- rncbc aka Rui Nuno Capela

12 years, 11 months

[LAD] Licensed for Sampled Instrument Example / Suggestion

by Nils Gey

Hello Developers, I have written a short blog post about what I think is the ideal license for open source sampled instrument libraries. It is in fact either a CC license or GPL, I am not so naive to think I am able to write an entire license, but I have added necessary additions and exceptions. I am not a lawyer and I have no education or official background in law and rights. This is a suggestion, based on my experience with existing licenses and the requirements of sample based virtual instrument libraries, a.k.a "Samples" http://www.nilsgey.de/2013/02/28/License_Proposal_for_Sample_Instrument_Lib… I welcome any comments here or in the blog itself since I know that licenses are a serious matter. And I don't want to make a fool of myself. I remember some weird licenses, even in the linux audio community, and I don't want to create one of them :) Greetings, Nils

12 years, 11 months

[LAD] python, gtk, gstreamer

by drew Roberts

Ignorant here. Trying to scrounge around and make something work for a demo purpose. In python I am trying to build this pipeline: pipeline_txt = ( 'jackaudiosrc ! ' 'level name=level interval=1000000000 !' 'jackaudiosink') pipeline = gst.parse_launch(pipeline_txt) I have been trying that a number of ways. So, I basically watch the bus for level info. In a subroutine, I can print the peak info to the terminal. I can't seem to figure out how to pass this info back to the rest of the program so that I can hook it up to a graphical meter. Cna anyone point me to some simple code doing something like this? Give me some clues that might help someone who seems to be being very dense for days now? all the best, drew

12 years, 11 months

[LAD] Floss alternative to red5

by APO33

Hello all, we are working on some development of audio/video web live applications at the moment. We are facing a little problem, maybe some people here already came across. Some people advised us to use red5, an audio/video streaming and multi-user solution to take sound from mic / sound card input + webcam/cam to be streamed online via your browser. The biggest problem we are facing is that is based on adobe closed flash system and it use only proprietary format/codecs such as mp3, flv and h264 :-( We are looking for a way to do the same with floss technologies such as ogg, theora, icecast or others... The idea is that the final user will stream his sound and video with his browser and everyone could see/hear him and do the same via their browser. We are actually testing some solutions with gstreamer but we still need an external client, although we are thinking about using some python script to run on the server to handle gstreamer live stream... but we are not sure... Anyway if any of you have any hints or some floss solutions for that, it would be really highly appreciated :-) thank you cheers Julien -- APO33 space of research and experimentation http://www.apo33.org info(a)apo33.org

12 years, 11 months

Re: [LAD] Puredata slow response

by Ivica Ico Bukvic

Not sure if this is going to help but I did notice with pd-l2ork on a laptop with an AMD video card (fglrx driver) when I have the tearfree (vsync) option enabled pd-l2ork's gui gets very sluggish. Disabling the vsync option makes it fine. On Feb 24, 2013 3:54 PM, "Fons Adriaensen" <fons(a)linuxaudio.org> wrote: Hello all, I'm seeing a strange probelm with Pd. I'm testing a very simple patch (total CPU load < 1.5% with DSP enabled). There are a few message boxes used to set a hslider to some preset values. With DSP enabled they take something like a second to respond to a click. What's wrong here ? Ciao, -- FA A world of exhaustive, reliable metadata would be an utopia. It's also a pipe-dream, founded on self-delusion, nerd hubris and hysterically inflated market opportunities. (Cory Doctorow) _______________________________________________ Linux-audio-dev mailing list Linux-audio-dev(a)lists.linuxaudio.org http://lists.linuxaudio.org/listinfo/linux-audio-dev

12 years, 11 months

[LAD] sound/usb: Add support for Steinberg UR22 audio interface.

by Clemens Koller

This USB-Audio/MIDI-Interface is based on a Yamaha YC706A0 ASIC. Signed-off-by: Clemens Koller <clemens.koller(a)embeon.de> diff --git a/sound/usb/quirks-table.h b/sound/usb/quirks-table.h index c39f898..d18429a 100644 --- a/sound/usb/quirks-table.h +++ b/sound/usb/quirks-table.h @@ -353,6 +353,36 @@ YAMAHA_DEVICE(0x105d, NULL), } } }, +{ /* Support for Yamaha YC706A0 chipset based Steinberg UR22 audio interface */ + USB_DEVICE(0x0499, 0x1509), + .driver_info = (unsigned long) & (const struct snd_usb_audio_quirk) { + /* .vendor_name = "Yamaha", */ + /* .product_name = "Steinberg UR22", */ + .ifnum = QUIRK_ANY_INTERFACE, + .type = QUIRK_COMPOSITE, + .data = (const struct snd_usb_audio_quirk[]) { + { + .ifnum = 1, + .type = QUIRK_AUDIO_STANDARD_INTERFACE + }, + { + .ifnum = 2, + .type = QUIRK_AUDIO_STANDARD_INTERFACE + }, + { + .ifnum = 3, + .type = QUIRK_MIDI_YAMAHA + }, + { + .ifnum = 4, + .type = QUIRK_IGNORE_INTERFACE + }, + { + .ifnum = -1 + } + } + } +}, YAMAHA_DEVICE(0x2000, "DGP-7"), YAMAHA_DEVICE(0x2001, "DGP-5"), YAMAHA_DEVICE(0x2002, NULL),

12 years, 11 months

[LAD] Interoperability between session management systems

by Johannes Kroll

A couple of days ago, I tried out non-session-manager, and thought, this is really nice. It really works in a practical, easy way. Unfortunately the number of apps supporting non-session is quite small (as is the case for *all* session management systems, AFAIK). There may be "a complete audio studio" supporting non-session, from one choice of sequencer to one synth to one sampler, but people like to use their favorite software. You can't just say, "if you want to use a sequencer, use X because it supports non-session". So its usefulness is limited. However, many apps support one session management framework or the other. So the obvious thing to do if you want to give people more choices would be to create some kind of interoperability layer between session management systems. What do you think about this? Is there an effort for something like this already underway? I personally think a good first step might be to create some compatibility between non-session (because I like it) and jack-session (because most people are using jack).

12 years, 11 months

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Linux-audio-dev