Linux-audio-dev

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7513 discussions

by dave＠661.org

Building upon what I learned back in April about mixing, I've managed to get all my inputs into the same formats for output. I've made some developments in getting stuff to correctly play individually, but mixing is still beyond me. playaiff() Waits for semaphore audio_empty, then gets mutex. Then fills bleepbuffer with 2-channel, 16-bit, 44100Hz float audio data from an AIFF chunk. When the buffer is full, it puts up the audio_full semaphore and releases the mutex. While there are still data to process, the global bleep_playing is true. A thread is spawned for this whenever an AIFF chunk must be played. It terminates when the chunk is done playing. playmusic() Calls either playmod() or playogg() depending on what kind of chunk has been passed to it. Those two functions are the same as playaiff() except they handle MODs or OGGs. While there are still data to process, the global music_playing is true. A thread is spawned for this whenever a MOD or OGG chunk must be played. It terminates when the chunk is done playing. mixer() Waits for the audio_full semaphore, then gets mutex. If bleep_playing is true and music_playing is false, convert bleepbuffer (floats) to shortbuffer (shorts) and play shortbuffer with ao_play(). If bleep_playing is false and music_playing is true, convert musicbuffer (floats) to shortbuffer (shorts) and play shortbuffer with ao_play(). If both bleep_playing and music_playing are true, then step through bleepbuffer[i] and add musicbuffer[i]. Convert bleepbuffer to shorts and play shortbuffer. A thread is spawned for this on startup and runs until the main thread terminates. Now, the trouble. If I start music in the form of a MOD chunk, then play an AIFF, I get a distorted mix and then the music keeps going on cleanly. Subsequent AIFF plays perform the same whether or not the MOD is playing. If I start music in the form of an OGG chunk, then play an AIFF, I get a distorted mix, then a harsh screech for a few more seconds, and then maybe a segfault. What is wrong with my mixer? Here's the latest code: https://github.com/DavidGriffith/frotz/blob/ao-curses/src/curses/ux_audio.c These libraries are necessary: install libao, libvorbis, libncurses, libmodplug, and libsamplerate. Test program is at http://661.org/if/story.zblorb There are three buttons: red, green, and blue. Pressing these will cause an AIFF to play. There is a Commodore 64 that plays an OGG. The Amiga will play a MOD. Pressing the "off" button will turn off all sounds. Just turning off the music maker won't work. That's another problem for which I do not need assistance. Red button: 2-channel, 16-bit, 44100Hz Green button: 1-channel, 8-bit, 11025Hz Blue button: 1-channel, 8-bit, 11025Hz Tests are as follows: ! Pressing red, green, or blue buttons results in different noises. > PRESS RED BUTTON You press the red button. ! quit and restart > TURN ON COMMODORE 64 You turn on the Commodore 64 and it immediately begins playing the tune from the game Sanxion. ! At this point, pressing one of the colored buttons will cause a ! distorted mix and usually a segfault. ! quit and restart > TURN ON AMIGA You turn on the Commodore Amiga and it immedately begins playing an old time MOD file. > PRESS BLUE BUTTON You press the blue button. ! Here there is a distorted mix that runs a bit slower than it should. ! When the noise produced by the colored button completes, the MOD file ! music continues with no more distortion. Pressing a colored button ! again will result in the same distortion and then the MOD continues as ! before. -- David Griffith dave(a)661.org A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail?

9 years, 11 months

Offering my software skills in London - ZynAddSubFX and Paulstretch creator

by Paul Nasca

Hi. As I live in London, I would like to offer my skills and abilities as a software developer to a company nearby. What companies/start-ups would you recomand? Please email me for details. P.S. No recruitment agencies, please. Thank you. Paul Nasca, creator of ZynAddSubFX and Paulstretch http://www.paulnasca.com

9 years, 11 months

[ANN] Qtractor 0.7.1 - The Meson Dope beta release

by Rui Nuno Capela

Hey, Here's to all southerners for whom the so called Summer'15 didn't made much sense... Beg your pardon yet and again, but it's that time of year when grapefruit is about ripening, pretty fast and maybe late, at least on the northern hemisphere. No worries: harvesting has already been carried away. So it's your call now, wether it makes for ugly bad wine or, pretty good vinegar... "Quickly, bring me a beaker of wine so that I may wet my mind and say something clever." --Aristophanes never mind, Qtractor 0.7.1 (meson dope beta) is released! Now, for the clueless: Qtractor [1] is an audio/MIDI multi-track sequencer application written in C++ with the Qt framework [2]. Target platform is Linux, where the Jack Audio Connection Kit (JACK [3]) for audio and the Advanced Linux Sound Architecture (ALSA [4]) for MIDI are the main infrastructures to evolve as a fairly-featured Linux desktop audio workstation GUI, specially dedicated to the personal home-studio. And for the ones who can aptly tell a TL;DR apart from a hangover: Besides the incidental bug-fixes and proverbial business-as-usual stance for this dot release, the most probable and hopefully significant news about it, is that this will the last to build against Qt4 by default. The time has come to move on up to Qt5. Remember that a Qt5 build is and has been possible already for ages now but somewhat relegated on a subpar status due to the once lack of support for all non-Qt5 LV2 plug-ins GUIs out there. Not anymore! Starting from this very release onwards there's this so called <em>native</em> LV2 GTK2 and X11 UI support on Qt5. Also thriving, drobilla's libsuil is being updated to par just that as well. So things are all aligning up nigh. A special note to the voluntary packager: if you choose, for any reason you may find commendable, to build, package and distribute a Qt5 build (via ./configure --enable-qt5 ...) please be sure that every LV2 plug-ins around that take Qt as its UI framework are also build, packaged and distributed on the same premises, otherwise they might just fail and crash Qtractor [1] on show. Among those are of course the one comprised by the 'Vee One Suite', namely synthv1 [9], samplv1 [10] and drumkv1 [11], of course. Also as a(nother) side note: It has been for quite some time there's an alternate github.com [7] repository which is kept in sync with the sf.net one [8]. However, this doesn't mean that the Qtractor [1] project is about to migrate to brand new hosting whatsoever: the original upstream source code repository is, will be, as ever was, always kept somewhere else still in this world and universe. It's a Git [12] world out nowadays and as the mottos says, --everything-is-local, --distributed-is-the-new-centralized ;) Enjoy. Website: http://qtractor.sourceforge.net Project page: http://sourceforge.net/projects/qtractor Downloads: http://sourceforge.net/projects/qtractor/files - source tarball: http://www.rncbc.org/archive/qtractor-0.7.1.tar.gz - source package (openSUSE 13.2): http://www.rncbc.org/archive/qtractor-0.7.1-19.rncbc.suse132.src.rpm - binary packages (openSUSE 13.2): http://www.rncbc.org/archive/qtractor-0.7.1-19.rncbc.suse132.i586.rpm http://www.rncbc.org/archive/qtractor-0.7.1-19.rncbc.suse132.x86_84.rpm - wiki (help wanted!): http://sourceforge.net/p/qtractor/wiki/ Weblog (upstream support): http://www.rncbc.org License: Qtractor [1] is free, open-source Linux Audio [5] software, distributed under the terms of the GNU General Public License (GPL [6]) version 2 or later. Change-log: - Fixed an ages old MIDI track/channel instrument mapping (bank, program) issue that prevented normal all-shut-up messages from being sent to MIDI output buses/ports on playback stop. - Messages standard output capture has been improved again, now in both ways a non-blocking pipe may get. - Fixed port on MIDI 14-bit controllers input caching. - Fixed false value readings on the MIDI clip editor (aka. piano-roll) tool-tips, when dragging a note velocity or controller value outside the acceptable nominal range (eg. 0-127). - Added LV2_BUF_SIZE__nominalBlockLength option support (patch by falktx aka. Filipe Coelho, thanks). - Fixed wrong initial tempo/time-signature display when session is loaded from command line. - LV2 plug-in UI GTK2 and X11 in Qt5 host native support added. - Transport/Auto Backward feature now honoring (auto return) to same current location precedence as Transport/Backward. - Single/unique application instance control adapted to Qt5/X11 (cf. configure --enable-xunique). - MIDI Tools/Transpose, Resize duration display format (frames, time or BBT) have been fixed. - Build fix for Qt5.5 (patch by KaOS, thanks). - MIDI Tools/Quantize et al. are tentatively being corrected to take event times as relative to THE beginning of session, instead of MIDI clip start location. References: [1] Qtractor - An audio/MIDI multi-track sequencer http://qtractor.sourceforge.net [2] Qt framework, C++ class library and tools for cross-platform application and UI development http://qt.io/ [3] JACK Audio Connection Kit http://jackaudio.org [4] ALSA, Advanced Linux Sound Architecture http://www.alsa-project.org/ [5] Linux Audio consortium of libre software for audio-related work http://linuxaudio.org [6] GPL - GNU General Public License http://www.gnu.org/copyleft/gpl.html [7] Qtractor Git repository on github.com http://github.com/rncbc/qtractor [8] Qtractor Git repository on sourceforge.net http://git.code.sf.net/p/qtractor/code [9] synthv1 - an old-school polyphonic synthesizer http://synthv1.sourceforge.net/ [10] samplv1 - an old-school polyphonic sampler http://samplv1.sourceforge.net/ [11] drumkv1 - an old-school drum-kit sampler http://drumkv1.sourceforge.net/ [12] Git distributed version control system http://git-scm.com See also: http://www.rncbc.org/drupal/node/960 Enjoy && have fun. -- rncbc aka. Rui Nuno Capela

9 years, 11 months

QMidiArp-0.6.2 released

by Frank Kober

Hello all, This qmidiarp release dares to come about a year after the last one...and yet again: not much new stuff, but some more bugs squeeeezed, thanks to some courageous reporters. And, after all, it's a lifesign isn't it? In other words, updating is of course highly recommended. Have fun with QMidiArp 0.6.2, below are the list of changes and links Frank ----- qmidiarp-0.6.2 (2015-10-06) Fixed Bugs o Arp: Regression: Latch mode caused the first note playing on forever and other annoyances (Bug #12 reported by Alois Cochard) o Seq: Small position error of the helper tick line relative to the notes placed o Seq: Note length values saved to file were not correct and had no correct default (Bug #14 reported by Steve Grace) o LV2 Seq and Lfo: Display was not correct when diminishing resolution or length in plugin UI Minor improvement o LV2 Seq: Vertical zoom values are part of the controls and therefore saved in presets as well ----- QMidiArp is a MIDI arpeggiator, phrase generator and controller LFO for JACK and ALSA. It can run multiple synchronized arpeggiators, LFOs and step sequencers. The modules are also available as LV2 plugins with Qt user interface. All in all it is a handy live tool. Website http://qmidiarp.sourceforge.net/ Download http://sourceforge.net/projects/qmidiarp/files/qmidiarp/0.6.2/qmidiarp-0.6.… There is now also a github repo that will be kept in sync with the sf repo for the time being https://github.com/emuse/qmidiarp

9 years, 11 months

click on connection graph change

by Andrew Yates

Hi all, When I change the track routing in ardour I get a small click in the main audio. Examples would be when routing drum tracks through a sub-group, or changing the side chain input to a compressor. Is this expected behaviour or is this due to a configuration problem with jack? Thanks Andy

9 years, 11 months

[OT] Coursera: Audio Signal Processing for Music Applications

by Dave Phillips

Saw this announced on the Linux Musicians site, thought it may be of interest to some folks here. (Sorry if it's a repost). https://www.coursera.org/course/audio Instructors are professors Xavier Serra and Julius O. Smith III, two very well-known DSP worthies. Course syllabus : Week 1: Introduction; basic mathematics Week 2: Discrete Fourier transform Week 3: Fourier transform properties Week 4: Short-time Fourier transform Week 5: Sinusoidal model Week 6: Harmonic model Week 7: Sinusoidal plus residual modeling Week 8: Sound transformations Week 9: Sound/music description Week 10: Concluding topics; beyond audio signal processing Best, dp

9 years, 11 months

Three academic job openings at soundjack.eu

by Adrian Knoth

Hi! Alexander Carot contacted me to spread the news: Starting in April 2016, three research assistant positions (PhD candidates welcome) will be available within the Soundjack project. If interested, please contact Prof. Carôt (a.carot(a)inf.hs-anhalt.de). (copy-pasted from <http://www.soundjack.eu/jobs.html>) I've been told one is TV-L13, the other is 75% and the third is 50% (money equivalent can be found here [0]) The project will be about making music in a distributed environment, contract will last three years (no idea if extendible). Working from home is negotiable and even considered part of the project. Candidates are expected to speak English, German is explicitly NOT required. Feel free to forward to interested parties. Cheers [0] https://de.wikipedia.org/wiki/Tarifvertrag_f%C3%BCr_den_%C3%B6ffentlichen_D…

9 years, 11 months

Segfault with liblrdf if raptor is compiled with curl support

by Tito Latini

Hello, I want to propose the follow flag for raptor in liblrdf library: #if RAPTOR_VERSION >= 20000 raptor_world_set_flag(world, RAPTOR_WORLD_FLAG_WWW_SKIP_INIT_FINISH, 1); #endif before raptor_world_open() is called (explicitly or implicitly), for example after raptor_new_world() in lrdf_init(). That flag avoids to call curl_global_init() (not thread-safe) in raptor_www_init() and curl_global_cleanup() in raptor_www_finish(). Rare but possible (I'm lucky), if raptor is compiled with curl support, I have experienced the follow crash during Rosegarden startup: #0 0x00007ffff0a84f39 in lh_insert () from /lib64/libcrypto.so.1 #1 0x00007ffff0a087ba in OBJ_NAME_add () from /lib64/libcrypto.so.1 #2 0x00007ffff0a94cf8 in OpenSSL_add_all_ciphers () from /lib64/libcrypto.so.1 #3 0x00007ffff0a94cae in OPENSSL_add_all_algorithms_noconf () from /lib64/libcrypto.so.1 #4 0x00007ffff1acf20c in ?? () from /usr/lib64/libcurl.so.4 #5 0x00007ffff1ad605a in curl_global_init () from /usr/lib64/libcurl.so.4 #6 0x00007ffff22cc0fa in raptor_www_init () from /usr/lib64/libraptor2.so.0 #7 0x00007ffff22c9ef0 in raptor_world_open () from /usr/lib64/libraptor2.so.0 #8 0x00007ffff22c63f1 in raptor_new_uri () from /usr/lib64/libraptor2.so.0 #9 0x00007ffff5d26701 in lrdf_read_file_intl () from /usr/lib64/liblrdf.so.2 #10 0x00007ffff5d27626 in lrdf_read_file () from /usr/lib64/liblrdf.so.2 #11 0x00000000004d8d79 in Rosegarden::LADSPAPluginFactory::discoverPlugins() () The code is a simple lrdf_init, for-loop of lrdf_read_file, lrdf_cleanup, and curl seems useless to read/manipulate rdf files for LADSPA plugins. I have recompiled raptor without curl support --with-www=xml to use libxml, so the only work in raptor_www_init() is to set world->www_initialized = 1; without the call for curl_global_init().

9 years, 11 months

[ANN] Summer'15 release frenzy wrap up!

by Rui Nuno Capela

Hello? Summer'15 release frenzy is not over yet!... well, it's only over on the 'equinox' anyway... * QmidiNet - A MIDI Network Gateway via UDP/IP Multicast * QmidiNet [1] 0.3.0 has been released! QmidiNet [1] is a MIDI network gateway application that sends and receives MIDI data (ALSA-MIDI and JACK-MIDI) over the network, using UDP/IP multicast. Inspired by multimidicast [4] and designed to be compatible with ipMIDI [5] for Windows. Website: http://qmidinet.sourceforge.net Project page: http://sourceforge.net/projects/qmidinet Downloads: http://sourceforge.net/projects/qmidinet/files - source tarball: http://download.sourceforge.net/qmidinet/qmidinet-0.3.0.tar.gz - source package: http://download.sourceforge.net/qmidinet/qmidinet-0.3.0-8.rncbc.suse132.src… - binary packages: http://download.sourceforge.net/qmidinet/qmidinet-0.3.0-8.rncbc.suse132.i58… http://download.sourceforge.net/qmidinet/qmidinet-0.3.0-8.rncbc.suse132.x86… Change-log: - System tray icon now blinks on network send/receive activity. - Prefer Qt5 over Qt4 by default with configure script. - Complete rewrite of Qt4 vs. Qt5 configure builds. - Fixed for some strict tests for Qt4 vs. Qt5 configure builds. * QmidiCtl - A MIDI Remote Controller via UDP/IP Multicast * QmidiCtl [2] 0.3.0 has been released! QmidiCtl [2] is a MIDI remote controller application that sends MIDI data over the network, using UDP/IP multicast. Inspired by multimidicast [4] and designed to be compatible with ipMIDI [5] for Windows. QmidiCtl [2] has been primarily designed for the Maemo [6] enabled handheld devices, namely the Nokia N900 [7] and also being promoted to the Maemo Package [8] repositories. Nevertheless, QmidiCtl may still be found effective as a regular desktop application as well. Website: http://qmidictl.sourceforge.net Project page: http://sourceforge.net/projects/qmidictl Downloads: http://sourceforge.net/projects/qmidictl/files - source tarball: http://download.sourceforge.net/qmidictl/qmidictl-0.3.0.tar.gz - source package: http://download.sourceforge.net/qmidictl/qmidictl-0.3.0-7.rncbc.suse132.src… - binary packages: http://download.sourceforge.net/qmidictl/qmidictl-0.3.0-7.rncbc.suse132.i58… http://download.sourceforge.net/qmidictl/qmidictl-0.3.0-7.rncbc.suse132.x86… Change-log: - Prefer Qt5 over Qt4 by default with configure script. - Complete rewrite of Qt4 vs. Qt5 configure builds. - Fixed for some strict tests for Qt4 vs. Qt5 configure builds. * QXGEdit - A Qt XG Editor * QXGEdit [3] 0.3.0 has been released! QXGEdit [3] is a live XG instrument editor, specialized on editing MIDI System Exclusive files (.syx) for the Yamaha DB50XG [9] and thus probably a baseline for many other XG devices. Website: http://qxgedit.sourceforge.net Project page: http://sourceforge.net/projects/qxgedit Downloads: http://sourceforge.net/projects/qxgedit/files - source tarball: http://download.sourceforge.net/qxgedit/qxgedit-0.3.0.tar.gz - source package: http://download.sourceforge.net/qxgedit/qxgedit-0.3.0-6.rncbc.suse132.src.r… - binary packages: http://download.sourceforge.net/qxgedit/qxgedit-0.3.0-6.rncbc.suse132.i586.… http://download.sourceforge.net/qxgedit/qxgedit-0.3.0-6.rncbc.suse132.x86_6… Change-log: - Single/unique application instance control adapted to Qt5/X11. - Prefer Qt5 over Qt4 by default with configure script. - Complete rewrite of Qt4 vs. Qt5 configure builds. - A new top-level widget window geometry state save and restore sub-routine is now in effect. - Added "Keywords" to desktop file; fix passing debian flags on configure (patches by Jaromír Mikeš, thanks). - Fixed for some strict tests for Qt4 vs. Qt5 configure builds. - Added application description as freedesktop.org's AppData. License: QmidiNet [1], QmidiCtl [2] and QXGEdit [3] are free, open-source Linux Audio [10] software, distributed under the terms of the GNU General Public License (GPL) version 2 or later [11]. See also: http://www.rncbc.org/drupal/node/950 References: [1] QmidiNet, a MIDI Network Gateway via UDP/IP Multicast http://qmidinet.sourceforge.net [2] QmidiCtl, a MIDI Remote Controller via UDP/IP Multicast http://qmidictl.sourceforge.net [3] QXGEdit, a Qt XG Editor http://qmidictl.sourceforge.net [4] multimidicast, ends and receives MIDI from Alsa sequencers over your network http://llg.cubic.org/tools/multimidicast [5] ipMIDI, MIDI over Ethernet ports - send MIDI over your LAN http://nerds.de [6] Maemo Community http://www.maemo.org [7] Nokia N900, the first Maemo device which may also be used as a phone http://wiki.maemo.org/Nokia_N900 [8] Maemo package overview for QmidiCtl http://maemo.org/packages/view/qmidictl/ [9] Yamaha DB50XG, PC Soundcard Daughter Board http://www.soundonsound.com/sos/1996_articles/may96/yamahadb50xg.html [10] Linux Audio consortium of libre software for audio-related work http://linuxaudio.org [11] GNU General Public License (GPL) http://www.gnu.org/copyleft/gpl.html Have (lots of) fun, always! -- rncbc aka. Rui Nuno Capela

9 years, 12 months

mcpdisp-0.0.4 is released (fwd)

by Len Ovens

To: linux-audio-announce(a)lists.linuxaudio.org Subject: mcpdisp-0.0.4 is released The Mackie Control Protocol display emulator has a new release. http://www.ovenwerks.net/software/mcpdisp.html The code has be redone in c++ so that I could take it out of the terminal age into the GUI age. If you are using a BCF2000 or two this will add the Mackie scribble strips and channel LED indicators to your setup. Source can be downloaded from: https://github.com/ovenwerks/mcpdisp/archive/mcpdisp-0.0.4.tar.gz or the latest can be cloned from: git clone https://github.com/ovenwerks/mcpdisp.git -- Len Ovens www.ovenwerks.net

9 years, 12 months

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Linux-audio-dev