Linux-audio-dev December 2010

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Faust MIDI?

by Carlo Capocasa

Hi, is it possible to send and receive MIDI with a FAUST program? Carlo

12 years, 9 months

Re: [LAD] Meego pulseaudio "compliance" and "enforcement" (was Re: [Meego-handset] Enabling Speakerphone)

by Niels Mayer

FYI, here's an example of the kind of app that needs to have good audio performance on a handset: http://www.youtube.com/watch?v=bwqflVX5oNo http://www.warmplace.ru/soft/sunvox/ ( http://lists.linuxaudio.org/pipermail/linux-audio-user/2010-December/074828… ) It has decent performance on maemo and appears to use pulseaudio, which eats 1/3 of the CPU of the 'sunvox' process. The sunvox application appears to have a UI thread and a worker thread each consuming about 1/2 of the 35% CPU load of the app. Mem: 238432K used, 7108K free, 0K shrd, 3396K buff, 67580K cached CPU: 52.2% usr 7.8% sys 0.0% nice 39.8% idle 0.0% io 0.0% irq 0.0% softirq Load average: 0.99 0.45 0.16 PID PPID USER STAT RSS %MEM %CPU COMMAND 1916 1162 user S 6388 2.5 35.1 /usr/bin/sunvox 825 1 pulse R < 3812 1.5 12.1 /usr/bin/pulseaudio --system --high-priority 897 730 root S < 16524 6.7 9.6 /usr/bin/Xorg -logfile /tmp/Xorg.0.log -logverbose 1 -nolisten tcp -noreset -s 0 -core Doing an "ls -lR /" in a remote xterm (over SSH) results in some audio glitching, but no "desynchronization" where the audio just stops playing. -- Niels.

14 years

Re: [LAD] tapiir website/source

by Philipp

Excerpts from Philipp's message of 2010-03-06 18:30:58 +0100: > I noticed a while ago that the tapiir website is gone or at least > non-functional. Do you guys know more about it? > > http://www.iua.upf.es/~mdeboer/tapiir/ links to: > http://www.iua.upf.es/~mdeboer/projects/tapiir/ links to: > http://www.resorama.com/maarten/projects/tapiir which returns 404 > > I do have a tarball however, version 0.7.2 and still compiling with > recent gcc versions: > http://aur.archlinux.org/packages/tapiir/tapiir/tapiir-0.7.2.tar.gz > > If there is a new website or a newer tarball, please let me know. > > Regards, > Philipp Hi, it seems the source is still not up or gone again. Any advice? I still have db3059abc56a59e9beaed4a8ea693e6b tapiir-0.7.2.tar.gz and could host it somewhere if that helps anything.. Regards, Philipp

14 years, 1 month

ALSA multi plugin and JACK xrun callbacks

by Lee Azzarello

Hello, I'm looking for some advice for an interesting symptom of putting my M-Audio Fast Track Pro USB sound card into ALSA multi mode. This sound card has four physical outputs which are mapped to two 2 channel ALSA streams rather than one four channel stream. I used the ALSA multi plugin to combine these two streams into a single pcm device so JACK can interface with all four outputs. It is working nicely. Despite no perceptible problems in sound quality or latency, jackd is printing hundreds of XRUN callback warnings to the message console each second! I can operate the system perfectly fine, run multiple applications, connect them to the four virtual outputs with no audible timing issues. What is the meaning of this many XRUN callbacks per second? What kind of performance will this impact if not sound playback? Thanks for your help, Lee Azzarello

14 years, 1 month

usb tools ?

by Dave Phillips

Greetings, A fellow Fender Mustang 1 user is working on native Linux software that can be used with the amplifier. Apparently he needs some tools like usbsnoop to find out what's happening to & from the amp's USB port. He wrote that usbsnoop and snoopyusb weren't able to do the job, so I thought I'd ask if there are other similar tools that might be more up-to-date. Suggestions ? Best, dp

14 years, 1 month

On the last eve of the year

by Jens M Andreasen

It was so terribly cold. Snow was falling, and it was almost dark. Evening came on, the last evening of the year. In the cold and gloom a poor little girl, bareheaded and barefoot, was walking through the streets. Of course when she had left her house she'd had slippers on, but what good had they been? ... The Little Match Girl http://mx44.linux.dk/~jens/unpublished/mtchgirl.mp3 ... "She wanted to warm herself," the people said. No one imagined what beautiful things she had seen, and how happily she had gone with her old grandmother into the bright New Year.

14 years, 1 month

PD L2Ork 20101229 snapshot now available

by Ivica Ico Bukvic

Please excuse cross-posting. Dear friends and fellow FOSS enthusiasts, It is my great pleasure to share with the community a belated Holiday present :-) in a form of latest snapshot of L2Ork iteration of Pure-Data. Better than ever, the latest version comes with the following improvements: *implemented apply undo for array properties and partially implemented apply undo for graph-on-parent object properties (does not apply to abstractions or top-level windows currently until I figure out how to address the indexing of toplevel windows inside the glist as well as how to address to which window such an undo belongs). *properties are disabled when right-clicking on an abstraction as modifying its settings externally does not make sense when one does not see the actual contents inside it. So, to edit the properties of an abstraction, one has to open the actual abstraction. *fixed how new arrays are created so that they always fit within the specified boundaries. Please note arrays that have been already created in prior patches remain untouched in terms of graph auto-resizing (legacy code is provided in g_editor.c canvas_vis that deals with this if anyone wishes to convert their arrays but is incomplete in that it assumes all arrays require resizing--this is however unnecessary as simple recreation of said arrays or manual readjustment of their settings ought to do the trick. -This feature needs further testing--feedback is most appreciated. *fixed how arrays deal with moving array points via mouse by restricting them within the array bounds--this should work for all gui-driven array operations, while array alterations via snapshots and other external ways of manipulating arrays remain unbound so as to allow for traditional data-flow debugging--this may change down the road in part due to introduction of the magicGlass option and in part due to belief that data monitoring should only report ranges specified by the graph. -This feature needs further testing--feedback is most appreciated. *added new feature for arrays where they report a bang through the <arrayname>_changed send (if one is provided) whenever they have been altered by a mouse click'n'drag--this in conjunction with array graph auto-resizing makes arrays formidable alternatives for multisliders. -This feature needs further testing--feedback is most appreciated. *when an array subpatch is opened and resized, the array automatically now resizes to properly fill the window. -This feature needs further testing--feedback is most appreciated. *fixed where array was not visible after reopening the patch if any of its points touched upon y graph limits. *fixed couple of segfaults caused by gridflow incompatibility--more problems remain with gridflow library compatibility, likely due to widgetbehavior and possibly also magicGlass incompatibility. Further investigation is necessary. *fixed memory leak in the disis_phasor~ external where the destructor was never properly called and updated its documentation (available in the l2ork_addons package). *fixed highlighting of signal nlets where nlet would revert to non-signal appearance after being highlighted/connected. *reintroduced array listview (this was a regression in respect to pd-extended). *improved appearance of the array listview. *fixed a few broken links in the pddp documentation and added new l2ork-specific array features to the pddp documentation. Latest snapshot is available from the usual place: http://l2ork.music.vt.edu/main/?page_id=56 Complete changelog since 11/25/2010 is available here: http://l2ork.music.vt.edu/data/pd/Changelog Happy belated Holidays! Best wishes, Ico

14 years, 1 month

[ANN] MusE 2.0alpha

by Robert Jonsson

Hello everybody, We have a present for you, a new release of MusE. The alpha indicates this is an early version so it's mainly - a teaser to spread the word. - an early adopters build. - to welcome developers who want to port MusE to other platforms. MusE has now been completely ported to the Qt4 architecture and we (mainly Tim and Orcan) are busy to make it even better than before, lots of gui stuff being reworked. MusE now also sports a new version of the DeicsOnze, DX11 emulating softsynth, up from version 0.2 to 1.0. The homepage has received a new look that we hope will give a better indication of what MusE is and does. Do visit http://muse-sequencer.org. The full changelog is available at: http://lmuse.svn.sourceforge.net/viewvc/lmuse/trunk/muse2/ChangeLog?revisio… Find the download at: https://sourceforge.net/projects/lmuse/files/ Happy Holidays! The MusE Team

14 years, 1 month

LV2 Beat reporting?

by Jeremy

Hi all, So I'm writing some LV2 plugins to wrap up the Aubio audio analysis library<http://aubio.org/>, and I'm not sure exactly how to handle functions like "onset" detection. Currently, it just outputs clicks to an audio port (0 when no beat, 1 when beat is detected). However, this doesn't take advantage of the power of LV2. It is unclear to hosts and other plugins exactly what sort of data is coming out. I was thinking that maybe it would output MIDI, as midi matches the "event based" aspect of beat detection. Perhaps sending out MIDI beat clock signals <http://en.wikipedia.org/wiki/MIDI_beat_clock>? However, that doesn't really match the sort of data that the Aubio functions detect. Maybe it could just send a midi note on event? It seems like maybe some sort of LV2 specific extension might be in order? The Event Port <http://lv2plug.in/ns/ext/event/#EventPort> extension seems to define everything I need: sending timestamped events with no extra information attached. The question is: does it require some sort of further extension to define what a beat port is in the way the MidiEvent extension does? Of course, this raises the question: Is a port specific for "beats" even necessary? I can think of a few cases: - DAW uses beat signals to set up markers on a track - DAW uses beat signals to break a percussive track up into beats. - Delay effect uses beat signals to have a timed delay - Automatic drummer adds on a percussion part to audio with varying tempo - ? other beat-synchronous effects? Anyway, I'm wondering what you all think would be the best option, or whether you think functionality like this is even warranted in an LV2 plugin (should analysis plugins stick to VAMP?). So let me know what you think. Jeremy Salwen

14 years, 1 month

[ANN] tschack-0.120.1 and PyJackd-0.1.0

by torbenh

hi... since jack1 release is taking pretty long, i decided to stop waiting with a tschack release. tschack is an SMP aware fork of jack1. its a dropin replacement like jack2. features: - jack1 mlocking - controlapi which works even when libjackserver.so is loaded RTLD_LOCAL - smp aware - backendswitching - strictly synchronous like jack1. (-> no latency penalty) - clickless connections. - shuts down audio processing when cpu is overloaded for too long. i also released PyJackd which is a wrapper around libjackserver. features: - commandline for backendswitching - pulseaudio dbus reservation. get it here: http://hochstrom.endofinternet.org/files/tschack-0.120.1.tar.gz http://hochstrom.endofinternet.org/files/PyJackd-0.1.0.tar.gz -- torben Hohn

14 years, 1 month

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Linux-audio-dev December 2010