Linux-audio-user November 2011

linux-audio-user@lists.linuxaudio.org

84 participants
73 discussions

by Frank Kober

Here it is, a new QMidiArp version has arrived! The main new features are JACK MIDI, which is the default backend now, JACK Session support, and a new in-sequence loop marker that can be used to bounce the play direction or to loop at a mouse-clicked position in the sequence. Note that you can still get the alsa backend by starting with qmidiarp -a . The full list of noticeable changes is below. Thanks again to all having reported ideas and bugs and given their support. Masters of the step sequencer, Enjoy! ----------- Feedback as usual to qmidiarp-devel(a)lists.sourceforge.net or on the IRC #qmidiarp Website with documentation: http://qmidiarp.sourceforge.net ----------- New Features o Groove functions now work for all modules, not only Arps o Effect of groove settings is displayed in the Arp/LFO/Seq screen o LFOs can be triggered and restarted by the keyboard o When reducing the size of LFO waves or Sequences, the original data is kept in memory and is also saved to the session file as a whole o LFO and Seq play direction can now be chosen, and bouncing loops are possible o New user positionable loop marker in Seq module. The marker is placed by left or right mouse click on the bottom cursor line of the sequencer and represents an additional return/loop point. It can be removed again by clicking in the bottom left or right area of the Seq screen. o Triggered one-shot play of LFO and Seqs improved o JACK MIDI backend available. This is now default, use the -a option for getting the ALSA backend o JACK Session support when using JACK MIDI backend Fixed Bugs o A rounding error led to desync when Arps were used with groove shift o MIDI controls for Groove did not initialize upon "New..." o MIDI Controllers assigned to multiple destinations stopped at the first one encountered and ignored all others General Changes o JACK MIDI is now the default backend, -a option enables ALSA backend o Obsolete .qma text file import removed

14 years

Re: [LAU] Simple, easy multithreaded circular buffer library for Linux?

by Kjetil S. Matheussen

Olivier Guilyardi: > > Ken Restivo wrote: >> It has been over 7 years since I last messed around with writing Pthreads applications. >> >> I recall it as a painful, ugly, brain-numbing task. I located an exercise I did back then to address the consumer/producer problem in Pthreads, and just the sight of it is giving me a headache. >> >> I'm being lazy, so instead of researching everything that's out there, I'll ask here: can anyone recommend a relatively simple and painless abstraction library (GPL or LGPL of course) that will give me functions to create a thread in which I can stuff things into a ring buffer, and another thread in which I can pull stuff out of it? >> >> By the way, I know that JACK has a very nice event buffer which is insanely easy to use (and I have), and makes multithreading almost transparent, but this isn't a JACK app. > > I don't know of any abstraction library, but creating/terminating a normal > thread with pthread is really an easy task IMO. It's about 10 lines in C. > > For inter-thread communication there's Portaudio's ring buffer: > http://portaudio.com/trac/browser/portaudio/trunk/src/common/pa_ringbuffer.h > > It can easily be used out of Portaudio (I'm currently doing that), and it > features memory barriers [1] which AFAIK Jack's ringbuffer doesn't. > > One problem with everything Portaudio is this heavy naming scheme. For a simpler > API, you might like my little wrapper: > http://jackbeat.samalyse.org/browser/jackbeat/trunk/src/core/ringbuffer.h > Nice. It's probably quicker to copy the jack_ringbuffer.c file out of jack though. > Portaudio actually also offers a callback mechanism (with hidden thread > creation), so if you're coding an non-JACK audio app, you might want to check it > out. > > For thread synchronization, semaphores (man semaphore.h) are really easy to use. > However, if you need a lock-free equivalent (for realtime, ...) phtread mutex > and especially pthread_mutex_trylock are your friends. > Those friends can be really cranky sometimes though. By using atomic operations instead, it's possible to avoid a lot of headache by not having to synchronize at all. Performance might be better too. Midishare has lockfree atomic functions for lifo and fifi queues: http://midishare.cvs.sourceforge.net/viewvc/midishare/midishare/src/common/…

14 years

[LAU] New Avantgarde Music - or just more Prog?

by Julien Claassen

Hello everyone! I've just completed my latest piece and it has reached its intended audience, so I'm ready to post it here. It's called Raw Magic: http://juliencoder.de/nama/raw_magic.ogg http://juliencoder.de/nama/raw_magic.mp3 And you can find lyrics here: http://juliencoder.de/nama/raw_magic.html Or of course visit the music page at: http://juliencoder.de/nama/music.html This time I'd like to utter my heartfelt thanks to Joy Bausch, for guitars. A nice job! I'd like to thank S. Massy, Gabbe Nord and the mysterious Mr. Bennett for being my second pair (and third and fourth :-) - though not necessarily in that order) of ears. Without you I'd still suffer from some of my mixing difficulties. And I'd like to thank Silvia. The beginning of that song the first four notes or so came to me in a small bar in Paris almost two months ago now. I thought of some more notes there, but they didn't sound right. :-) The other main idea followed later that day, after having attended a concert by Goran Bregovic. So this piece again stretches the boundaries of my usual influences. You'll find some light asian influence, the balkaniser, simple piano music, light jazz, metal, glam-rock, synth-pop and a bit of the good old prog all bundled into this. And it's not because I didn't know, whereelse to put them. It's actually a study of some rather personal experiences, seeing them from very different angles. I hope I succeeded. :-) I know, that my singing leaves somethig to be desired (better intonation for a start :-) ), but I suspect, that it could have been worse. As ever any feedback is welcome and a beer to those, who find the fun and games in the lyrics. :-) Kindest regards Julien =-=-=-=-=-=-=-=-=-=-=-=- Such Is Life: Very Intensely Adorable; Free And Jubilating Amazement Revels, Dancing On - FLOWERS! ====== Find my music at ====== http://juliencoder.de/nama/music.html ..................................... "If you live to be 100, I hope I live to be 100 minus 1 day, so I never have to live without you." (Winnie the Pooh)

14 years, 1 month

[LAU] Music: The Divorcees Waltz

by Josh Lawrence

A cover of a tune written by the great guitar player Adrian Legg, posted here for your enjoyment and suggestions. Link to blogspam: http://devio.us/~jhl/blog/?p=9 Direct link to the song: http://devio.us/~jhl/blog/wp-content/uploads/2011/11/divorcees-waltz.ogg Hope you all enjoy! (For Leigh - yea, that's all finger drumming in there :) -- Josh Lawrence 903-490-3700

14 years, 1 month

[LAU] New Experimental Track

by Folderol

This is a three part multi-layer improvisation, that hopefully pushes out my boundaries a bit more. I hope you like it. http://www.musically.me.uk/music/Stranger.ogg -- Will J Godfrey http://www.musically.me.uk Say you have a poem and I have a tune. Exchange them and we can both have a poem, a tune, and a song.

14 years, 1 month

[LAU] A new Bach 3-part Invention in C minor

by Julien Claassen

Hello everyone! OK, just recorded: http://juliencoder.de/nama/bach-c_minor_sinfonia.ogg http://juliencoder.de/nama/bach-c_minor_sinfonia.mp3 It's played on a piano and processed by a reverb from the concertgebouwe (Amsterdam). Nothing fancy. :-) I know, there are one or two problems in there, which shouldn't be, but overall it was the best I could do tonight and I feel rather impatient. :-) Enjoy, anycomments welcome! Warmly yours Julien =-=-=-=-=-=-=-=-=-=-=-=- Such Is Life: Very Intensely Adorable; Free And Jubilating Amazement Revels, Dancing On - FLOWERS! ====== Find my music at ====== http://juliencoder.de/nama/music.html ..................................... "If you live to be 100, I hope I live to be 100 minus 1 day, so I never have to live without you." (Winnie the Pooh)

14 years, 1 month

[LAU] Bathyal - a simple Csound composition

by Dave Phillips

Greetings, http://linux-sound.org/audio/bathyal.mp3 http://linux-sound.org/audio/bathyal.ogg A very simple ambient study created with Jean-Pierre Lemoine's AVSynthesis (sound by Csound) and edited with mhWaveEdit. Best, dp

14 years, 1 month

[LAU] pulseaudio in realtime mode

by Emanuel Rumpf

I can't start pulseaudio in realtime mode: I: module-jack-sink.c: JACK buffer size changed. I: module-jack-sink.c: JACK thread starting up. I: core-util.c: Successfully enabled SCHED_RR scheduling for thread, with priority 9. I: core-util.c: Successfully enabled SCHED_RR scheduling for thread, with priority 13. W: module-jack-sink.c: JACK error >Cannot use real-time scheduling (RR/67)(1: Operation not permited)< W: module-jack-sink.c: JACK error >JackClient::AcquireSelfRealTime error< But /etc/secuity/limits.conf @audio - rtprio 99 @audio - nice -20 @audio - memlock 6000000 @pulse-rt - rtprio 99 @pulse-rt - nice -20 @pulse-rt - memlock 6000000 groups user user dialout cdrom audio plugdev lpadmin pulse admin sambashare pulse-rt -- E.R.

14 years, 1 month

[LAU] [Music] Periri - Säkert sant

by Robert Jonsson

Hello everybody, It seems I'm working on lots of songs but never complete any of it ;) So to break with tradition, here's a new tune that popped out during beta testing of MusE. :) Link and player on this page: http://spamatica.se/periri/ I think it may be somekind of progressive electronica... if it matters ;) Feedback is very welcome, Robert

14 years, 2 months

[LAU] A different direction in music - Whisper

by Julien Claassen

Hello everyone! Today I've made up and recorded a new piece. Just piano. It's no Bach and it's no prog rock. No fancy overboard processing either. The piece is called "whisper - Since In Love, Verity Is Altering". It's a piece about decisions and changing and importance of a human being. http://juliencoder.de/nama/whisper.ogg http://juliencoder.de/nama/whisper.mp3 Or go to the website: http://juliencoder.de/nama/music.html Equipment used: LinuxSampler and my Sampletekk black Grand piano library, the new Nama version for recording and finalising, fons' FIL plugin for some light EQing and jconvolver for the reverb. I do'nt know, which reverb that is. It was the one I last used for Shout. I'm not sure, if I made a note on that. It sounded good though. :-) I hope you enjoy it and as ever; Comments are welcome, the good and the bad. Warm regards Julien =-=-=-=-=-=-=-=-=-=-=-=- Such Is Life: Very Intensely Adorable; Free And Jubilating Amazement Revels, Dancing On - FLOWERS! ====== Find my music at ====== http://juliencoder.de/nama/music.html ..................................... "If you live to be 100, I hope I live to be 100 minus 1 day, so I never have to live without you." (Winnie the Pooh)

14 years, 2 months

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Linux-audio-user November 2011