Linux-audio-dev April 2009

linux-audio-dev@lists.linuxaudio.org

63 participants
44 discussions

Re: [LAD] audio recording through pipe using mplayer and sox

by Kjetil S. Matheussen

Arnold Obdeijn: > > Hi all, > > I am using mplayer, sox and tee to capture streaming internet radio > and send it both to an audio recognition program and to a file > (recording). > This is how I do it: > > mplayer -playlist {url} -nocache -af volnorm -msglevel all=1 -nolirc > -vc dummy -vo null -ao pcm:file={$fifo1} & > I don't know if it will help or work, but how about using -dumpstream <file> instead of -ao pcm:file=<file> ? I think there's more buffering with -dumpstream than -ao pcm: ...

16 years, 1 month

qt and jack

by Gregorio Canelos

Greetings, I am trying to a connect a bare bones Qt-based client to the JACK audio server , and I am running into a strange run-time error. I recently posted my question on the Qt-Interest list but have had no luck. Maybe someone on this list would be kind enough to help... my Setup is: -Fedora 10 - 2.6.26.8-1.rt16.1.fc10.ccrma.i686.rt #1 SMP PREEMPT RT Tue Feb 17 15:48:24 EST 2009 i686 i686 i386 GNU/Linux -Qt 4.50 (for Linux/X11) -Jack audio connection kit The .cpp files which cause this error are here: ****************** #include <QApplication> #include "MainWindow.h" int main(int argc, char *argv[]) { QApplication app(argc, argv); MainWindow mainWindow; mainWindow.show(); return app.exec(); } ********************* #include "MainWindow.h" MainWindow::MainWindow() { QPushButton * b1 = new QPushButton("HELLO BUTTON",this); audioEngine = new AudioEngine(); audioEngine->run(); } MainWindow::~MainWindow() { } ********************** #include "AudioEngine.h" using namespace std; static int process(jack_nframes_t nframes, void *pvArg) { AudioEngine * pAudioEngine = static_cast<AudioEngine *> (pvArg); return pAudioEngine->audioEngineProcess(nframes); } int AudioEngine::audioEngineProcess(jack_nframes_t nframes) { currFrame = nframes; return 0; } AudioEngine::AudioEngine() { } AudioEngine::~AudioEngine() { } void AudioEngine::run() { const char * client_name = "Template Player"; jack_options_t options = JackNullOption; jack_status_t status; // open a client connection to the JACK server client = jack_client_open(client_name, options, &status); if (client == NULL) { fprintf(stderr, "jack_client_open() failed, status = 0x%2.0x\n", status); if (status & JackServerFailed) { fprintf(stderr, "Unable to connect to JACK server\n"); } exit(1); } if (status & JackServerStarted) fprintf(stderr, "JACK server started\n"); if (status & JackNameNotUnique) { client_name = jack_get_client_name(client); fprintf(stderr, "unique name `%s' assigned\n", client_name); } jack_set_process_callback(client, process, 0); // jack_on_shutdown(client, jack_shutdown, 0); //register the client ports input_port = jack_port_register(client, "input", JACK_DEFAULT_AUDIO_TYPE, JackPortIsInput, 0); output_port = jack_port_register(client, "output", JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0); if ((input_port == NULL) || (output_port == NULL)) { fprintf(stderr, "no more JACK ports available\n"); exit(1); } jack_activate(client); } ************************* Everything compiles , but I am getting the following run-time error: /usr/libexec/<unknown>: No such file or directory. Cannot access memory at address 0x7 Cannot access memory at address 0x7 Not sure what this means... I have registered a callback function with the JACK daemon and whenever I try to access the member variable currFrame from within the callback function I get that error. Has anyone seen this error before? -Thank You!

16 years, 1 month

lv2 sampleRate PortProperty seems not to work

by Renato Fabbri

turtle rdf here: http://svn.assembla.com/svn/audioexperiments/lv2plugs/filtro-notch/filtro-n… if you go like: svn co http://svn.assembla.com/svn/audioexperiments/lv2plugs/filtro-notch make install freq control is displaying only the fractions of the current sample rate, not the fraction times the sample rate, that is, its actual frequency as it is supposed to. tested in ingen and ardour. i found this same problem reported as an ardour bug report ( http://tracker.ardour.org/view.php?id=2611), but since i got the same behavior in Ingen i dont know what to do. any idea?

16 years, 1 month

jack_midi in jackd and jackdmp

by hermann meyer

Hi to all Thats my first post to the dev list, first I wont to say hello, and sorry for my bad english. I try to do my best to make it readable for you. So,. . I try to build a jack_midi output port and I get the stuff working with jackd(1). But my test's with jackdmp end up with crash's (segfaults). I realise that's because the needed buffer recived from jack_port_get_buffer(midi_output_ports, nframes) is == 0 when I run jackdmp-1.9.2. jackd gives me a buffer from 480. I 'am only be able to protect the port for crash's but I can't figure out what I make wrong. I try and I try and I try, but I can't get now . . . It would be realy great if someone from the list here is willing to have a lock at my source and give me a hint to drive me in the right direction. My (uggly) sources are here : http://apps.sourceforge.net/trac/guitarix/browser/trunk/src/main.cpp midi_process callback start's at line 233 regards hermann

16 years, 1 month

basic in-game audio synthesis api?

by james morris

Hi, I'm wanting to use basic synthesis techniques such as ADSRs LFOs hi/lo pass filters, echo, and reverb to generate some kind of ambient sound scape using pre-recorded audio clips, for a game I'm working on. Are there any libraries around to help make this a bit easier than coding it all using SDL_mixer? I'm not keen for a game to have audio, to depend on JACK or LADSPA plugins. Cheers, James

16 years, 1 month

VST and Qt

by David García Garzón

Hi, lads! Some news from the CLAM project. For anyone interested in that subject, we managed to build Qt based VST interfaces (from linux!). Not about integrating existing VST in Qt applications but building brand new plugins using Qt. This is an step to get visual prototyped VST from CLAM as we got from LADSPA and JACK on last releases. I don't think the integration could get into the next CLAM release, but i guess that just the Qt-VST integration could be useful to someone in the community. See more information here: http://vokicodder.blogspot.com/2009/04/vst-plugins-with-qt-user-interface.h… The code is available in the first link to the CLAM developers list. Not the proper distribution but i plan to make it available from clam or other repository in short. Any collaborative hacking to improve it is very welcome. -- David García Garzón (Work) dgarcia at iua dot upf anotherdot es http://www.iua.upf.edu/~dgarcia

16 years, 1 month

Re: [LAD] basic in-game audio synthesis api?

by james morris

Taken a quick look. It looks too low-level DSP for me. I was actually thinking something along the lines of Audiality (but could n't recall its name). Is Audiality dead? Anything else similar? Cheers, James. On 3/4/2009, "Stéphane Letz" <letz(a)grame.fr> wrote: > >Have a look at Faust: http://faust.grame.fr/ > >Stephane

16 years, 1 month

[LAC2009] stream team volunteers wanted!

by Jörn Nettingsmeier

hi everyone! for those among you who will make it to LAC 2009 in parma: we are looking for 1-2 more people to help with the streaming. your job would be to watch the paper sessions, hang out on IRC and relay the questions of remote participants to the local audience. if you're interested, you also get to play with some interesting video gear and the blazing new thusnelda encoder :) please get in touch! volunteers will be fed and watered as required, according to the Marije Baalman StreamTeam Sustenance Plan(tm). unfortunately, stream overlord eric rzewnicki can't be with us this year - i'd like to take the opportunity to offer HUGE (and i mean, like, HUMONGOUS) kudos to edrz for many years (and many more hours) of volunteer work for this community (not to mention shouldering frightening travel expenses year after year to haul himself to old europe). edrz: thanks! i hope we'll see you on IRC. best, jörn

16 years, 1 month

[ANN] Qtractor 0.4.1 (funky dominatrix) unleashed!

by Rui Nuno Capela

Hi There are bugs which are resilient. One is never sure whether squashing one doesn't let a plethora of lurking others get loose, like one's skeleton in the closet falling apart. Paraphrasing Linus' Law, after ESR: given enough eardrums all bugs are shallow. Thanks to all the brave souls who keep harnessing the toy to the bone, some of those nasties could be whipped off. At least for the time being ;) Trivially speaking, this dot-release marks the 4th anniversary of Qtractor as an active/personal project and, putting numerology to the side, it is being released on this April, 4th (04/04). But then, I do confess, this was just reckoned as an accidental after-thought, as everything in numerology, I guess :) Although only one developer is still responsible for 99% of the code (that's me!:), there's some outsourcing (kind of) shaping and already pending in its early stages: MIDI event list editing; Windows native VST plugin support, much in the lines of FST/WINE, as in Ardour, perhaps; a new logo and/or splash-screen design is also under this way. Keep in mind that all translations will be asked only after the end of the current alpha phase, whenever it would be an end to it :P Most importantly, there's serious help being needed on drafting the user manual. The current one available is getting outrageously outdated, ever since the 0.2 situation. It's already getting tough to play catch up. And everyone knows about developer(s) not feeling like doing documentation in the first place. Move on. The more participation the better. In general, if you ever feel like, please pick up your favorite line on the ever still TODO list and do step in. You'll be more than welcome: eardrums, which usually come in pairs, just like eyeballs do, are pretty wanted! So dress up your blacky leather and vinyl, put up the spiky collars and whip it, whip it good B) Here we go: Qtractor 0.4.1 (funky dominatrix) unleashed! Release highlights: * MIDI editor snap grid. (NEW) * Multi-clip selection normalize and quantize (NEW) * Audio export & sample-rate conversion (FIXED) * MIDI & audio playback sync (FIXED) * SSE optimization enabled (FIXED) * and a few more fixes and same lurking bugs ;) Same old intro/description: Qtractor is an audio/MIDI multi-track sequencer application, written in C++ on top of Qt Software's Qt4 framework, having JACK and ALSA as its main infrastructures and Linux as native and exclusive platform. Specially suited to the lone-wolf composer, arranger and (re)creative music-maker personal home-studio, it still hopes to evolve as a fairly featured desktop audio/MIDI workstation or at least, a prototypical part of it ;) Website: http://qtractor.sourceforge.net Project page: http://sourceforge.net/projects/qtractor Downloads: - source tarball http://downloads.sourceforge.net/qtractor/qtractor-0.4.1.tar.gz - user manual (outdated) http://downloads.sourceforge.net/qtractor/qtractor-0.3.0-user-manual.pdf Weblog (upstream support): http://www.rncbc.org License: Qtractor is free, open-source software, distributed under the terms of the GNU General Public License (GPL) version 2 or later. Features: - Multi-track audio and MIDI sequencing and recording. - Developed on pure Qt4 C++ application framework (no Qt3 nor KDE dependencies). - Uses JACK for audio and ALSA sequencer for MIDI as multimedia infrastructures. - Traditional multi-track tape recorder control paradigm. - Audio file formats support: OGG (via libvorbis), MP3 (via libmad, playback only), WAV, FLAC, AIFF and many, many more (via linsndfile). - Standard MIDI files support (SMF format 0 and 1). - Non-destructive, non-linear editing. - Unlimited number of tracks per session/project. - Unlimited number of overlapping clips per track. - XML encoded session/project description file. - Point-and-click, multi-select, drag-and-drop interaction (drag, move, drop, cut, copy, paste, delete, split) - Unlimited undo/redo. - Built-in mixer and monitor controls. - Built-in connection patchbay control and persistence (a-la QjackCtl). - LADSPA, DSSI and native VST plug-ins support. - Unlimited number of plug-ins per track or bus. - Plug-in presets, programs and chunk/configurations support. - Audio/MIDI clip fade-in/out (linear, quadratic, cubic). - Audio/MIDI clip gain/volume, normalize and export. - Audio clip time-stretching (WSOLA-like or via librubberband), pitch-shifting (also via librubberband) and seamless sample-rate conversion (via libsamplerate). - Audio/MIDI track export (mix-down, merge). - Audio/MIDI metronome bar/beat clicks. - Unlimited tempo/time-signature map. - MIDI clip editor (matrix/piano roll). - MIDI instrument definitions (a-la Cakewalk(tm)) - JACK transport sync master. - MMC control surface enabled. - MIDI Song Position cueuing support. - Configurable keyboard shortcuts. Change-log: - MIDI editor command item execution order has been fixed, correcting the redo/undo adjustment of overlapping note events (probably fixing bug #2723861). - MIDI clip editor (aka. piano-roll/matrix editor) sees one of its most wanted features introduced: visual snap grid, now accessible through View/Snap/Grid option toggle. - Actual non-zero session length gets back to status bar of main application window. - One potential buffer-overflow/memory-corruption crash bug has been fixed, long due on most audio (down) sample-rate conversions and affecting audio export in particular. - MIDI track/channel patch information, ie. bank-select and program-change events, are now being properly set on MIDI track/clip export. - SSE optimization is back in town after being mysteriously disabled since its dawn :/ - Looping and punch-recording now actively mutual exclusive states: setting either one unsets the other off and vice-versa. Also, punch-in/out is now made an undoable command. - Moving tracks, any track, up or down, were leaving MIDI playback and meter monitoring completely out-of-sync, now fixed. - Automatic crash-dump reports, debugger stack-traces (gdb), back-traces, whatever, are being introduced as a brand new configure option (--enable-stacktrace) and default enabled on debug build targets (--enable-debug). - Audio/MIDI drift correction is now progressive, taking a least significant differential approach, on every read-ahead cycle and swallowed on loop turn-arounds, as before. - Improved Edit/Clip/Normalize and Quantize commands, now affecting the whole extended multi-clip selection. - Playback is now being temporarily suspended while either transport rewind or fast-forward rolling is engaged. - A bad and shame-on-me bug was fixed: this was hideously affecting any track/clip playback synchronization, most noticeable after toggling solo/mute track states while playback is rolling and skipping the play-head backward over more than one clip under the same track. - A floating-rectangle flip that showed while dragging new files beyond the left of main track view is now gone. - MIDI note event truncation on both track and clip export has been fixed. Cheers && Enjoy! -- rncbc aka Rui Nuno Capela rncbc(a)rncbc.org

16 years, 1 month

Re: [LAD] jack_midi in jackd and jackdmp

by hermann meyer

Am Freitag, den 03.04.2009, 20:57 +0200 schrieb Stéphane Letz: > > Now, it work with jackdmp, great, > > > > So the Question comes in mind, why need I to register the midi port as > > first one ? Anyone experience the same behaviour ? Or is it just a > > effekt from a hidden bug ? mmm > > > > regards hermann > > > > _ > > Maybe, but could you extract the "crashing" code in a simpler test > client? It would help. > > Thanks > > Stephane I will do that, but dont get me wrong, speak about a posible bug in my code, not in your's. Jackdmp is realy nice, fast and light, that why I wont be able to run it with my app. And sorry, it will posible take some day's, my work try to eat me . . . thanks hermann

16 years, 1 month

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Linux-audio-dev April 2009