Linux-audio-dev

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7513 discussions

by Julien Claassen

Hello everyone! I have a couple of questions regarding this. 1. Does every soundcard have a clock? 2. Do other architectures than ALSA offer access to this clock? 3. Can the soundcard clock probably be accessed via simple device file access? I have looked into OSS, but didn't find anything there, directly reffering to clocks. If OSS or other unix sound drivers don't offer access to this resource, how would they take care of accuracy? Kindest regards and thanks in advance for any good advise Julien -------- Music was my first love and it will be my last (John Miles) ======== FIND MY WEB-PROJECT AT: ======== http://ltsb.sourceforge.net the Linux TextBased Studio guide ======= AND MY PERSONAL PAGES AT: ======= http://www.juliencoder.de

16 years, 11 months

JACK transport timebase and its callback

by Julien Claassen

Hello! I just read through the JACK transport section in the JACK reference again. If you want to be timebase-master you can (or must) supply a callback function to update the time-info. Does my program need audio thread (a process function?) Which timing source is used to update the time? Does my program provide it or does JACK provide it and my program only really kicks in when I want to relocate (jump to another position)? I am correct in assuming, that my code doesn't have to be multithreaded (at least not look multithreaded) if I want to use the JACK transport interface (control and timebase)? Kindest regards Julien -------- Music was my first love and it will be my last (John Miles) ======== FIND MY WEB-PROJECT AT: ======== http://ltsb.sourceforge.net the Linux TextBased Studio guide ======= AND MY PERSONAL PAGES AT: ======= http://www.juliencoder.de

16 years, 11 months

Denemo 0.8 Release -

by Nils Gey

Dear linux audio users and developers, Short version: ================== Denemo 0.8 is fresh, hot and avaible now! Grab your tarball @ http://download.savannah.gnu.org/releases/denemo/ (Windows binaries will join in later) and have a look at our newest features including full scripting support! If you are a programmer please help us to give Denemo JACKmidi/JACKtransport support so that its capable of blending with the rest of Linux-pro-audio. For contact, feature requests, bug reports and further information please visit http://www.denemo.org Interesting version: ================== Denemo is a music notation program for Linux and Windows (and MacOS some time ago) that lets you rapidly enter notation for typesetting via the LilyPond music engraver (because Lilypond is the reference and there is no sense in coding your own WYSIWYG notation apps). Its mainly controlled via your pc-keyboard with several edit-modes and shortcuts. Please note that we need help! Denemo has already many notation features build-in and if anything is not avaible you can enter Lilypond commandos and save them with your denemo file so that you can use the whole range of lilypond features. This means that Denemo is already capable of writing full, professional scores. But it lacks sequencer-features like advanced playback and routing via JACKmidi and support for JACKtransport. To really become the first usefull Linux notation-editor and notation-sequencer this is the last piece of the puzzle. Version 0.8 changelog: 1. A scripting interface to the Denemo commands has been created. 2. Example script-based commands are provided with the Denemo installation. 3. New scripts can be hand-written or "recorded" from a sequence of menu item clicks or by editing another script or a mixture of these. 4. New commands (scripts) can be installed in the menu system, given keyboard shortcuts, and generally used as other commands are. 5. The example scripts provided include a script showing the potential of Denemo for use in music education. In this example, random notes are generated and the user has to name the note. 6. Other examples include scripts for commands useful when generating scores with percussion, guitar fingerings, orchestral markings etc. 7. Various bugfixes and improvements to midi import have been made. greetings, Nils Gey www.denemo.org

16 years, 11 months

Any introductory material for sound programming?

by Carl-Erik Kopseng

Having searched the net for hours, I still cannot find any tutorials or intro-material for someone new to sound programming in Linux. Can anyone tip me of such a place? Things that would be valuable for a newbie: - Introduction to various ways of storing audio; float vs integer representation, bit depth issues, etc. - Introduction to using standard libraries such as libsndfile and libsamplerate. - How to programatically convert 24 bit sound files to 16 bit files The *only* audio programming introductions I could find was about ALSA and OSS. Trying to directly use the APIs is very frustrating when one doesn't have a high-level understanding of what goes on ... -- Carl-Erik Kopseng

16 years, 11 months

[OT] DIY Trigger - Piezo to MIDI to PC

by Ray Rashif

Sorry for the very random subject, but I figured I'd need all the help I can get. I've read about this for a _little_ while (time constraints..arghhh) on the WWW, and I've posted on www.edrum.info too. In case anyone here has better/fast/helpful suggestions/advice/shizznit, I'm sort of cross-posting: I just want one trigger, which I'll use for the kick drum. As such, I'm interested to know if there are premade boards for the MIDI conversion. Basically all I need is something which can take the vibrations and convert them to electrical signals (piezo), and then fed to something else that will convert that electrical signal to a MIDI-ON message, after which I can plug it into the MIDI input of an audio interface or use a MIDI-USB adapter to plug in to a USB port. And regarding MIDI, if I want to take into consideration dynamics, and let the piezo trigger MIDI messages with varying attack information, how would it be done? So depending on the voltage generated, it'd be a MIDI-ON but the final message to the computer (audio interface) would be a "MIDI-ON && ATTACK == 75" sort of logic. Sorry for the noobish description, have just started to dabble into (audio/midi) electronics. I understand the concept and design roughly and I can move on by reading the construction manual (refering to edrum's DIY guide), but at the moment I'm looking for a quick way to build a trigger as I need it asap (and no $$ for a real trigger kit/module).

16 years, 11 months

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

by Joern Nettingsmeier

Olivier Guilyardi wrote: > Here's how to run the test: > > svn co http://svn.samalyse.com/misc/rbtest > cd rbtest > make test on a pentium-m 32bit notebook: nettings@hoppetosse:/local/rbtest> make test gcc -Wall -I. -I./jack -lpthread -o test-int-array-jack \ test-int-array.c jack/ringbuffer.c gcc -Wall -I. -I./portaudio -lpthread -o test-int-array-portaudio \ test-int-array.c portaudio/ringbuffer.c portaudio/pa_ringbuffer.c gcc -Wall -I. -I./portaudio -lpthread -o test-int-array-portaudio-nobarrier \ -DNO_MEMORY_BARRIER \ test-int-array.c portaudio/ringbuffer.c portaudio/pa_ringbuffer.c ./alltests.sh Starting ringbuffer tests (buffer size: 512) === Jack ringbuffer test === starting ringbuffer stress test (2 minutes max) buffer size (bytes): 512 array size (bytes): 256 reader started on cpu 0 writer started on cpu: 0 Success === Portaudio ringbuffer test === starting ringbuffer stress test (2 minutes max) buffer size (bytes): 512 array size (bytes): 256 reader started on cpu 0 writer started on cpu: 0 Success === Portaudio ringbuffer test (without memory barriers) === starting ringbuffer stress test (2 minutes max) buffer size (bytes): 512 array size (bytes): 256 reader started on cpu 0 writer started on cpu: 0 Success nettings@hoppetosse:/local/rbtest> -- jörn nettingsmeier home://germany/45128 essen/lortzingstr. 11/ http://spunk.dnsalias.org phone://+49/201/491621 Kurt is up in Heaven now.

16 years, 11 months

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

by Joern Nettingsmeier

Olivier Guilyardi wrote: > To figure whether memory barriers are needed or not, we need to run the test on > various architectures. > > For this purpose, I've set up a small svn repo with everything to run the test > easily. There's no dependency, you just need pthread, gcc and sh. > > Here's how to run the test: > > svn co http://svn.samalyse.com/misc/rbtest > cd rbtest > make test i don't really understand the finer points of this discussion, but hey it's always great to join a technical thread. my favourite bikeshed color is yellow :-D ok, here comes the result for a single-cpu athlon64 4000+ in 64bit mode. nettings@kleineronkel:/build/rbtest> make test gcc -Wall -I. -I./jack -lpthread -o test-int-array-jack \ test-int-array.c jack/ringbuffer.c test-int-array.c: In function ‘main’: test-int-array.c:101: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘long unsigned int’ gcc -Wall -I. -I./portaudio -lpthread -o test-int-array-portaudio \ test-int-array.c portaudio/ringbuffer.c portaudio/pa_ringbuffer.c test-int-array.c: In function ‘main’: test-int-array.c:101: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘long unsigned int’ gcc -Wall -I. -I./portaudio -lpthread -o test-int-array-portaudio-nobarrier \ -DNO_MEMORY_BARRIER \ test-int-array.c portaudio/ringbuffer.c portaudio/pa_ringbuffer.c test-int-array.c: In function ‘main’: test-int-array.c:101: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘long unsigned int’ ./alltests.sh Starting ringbuffer tests (buffer size: 512) === Jack ringbuffer test === starting ringbuffer stress test (2 minutes max) buffer size (bytes): 512 array size (bytes): 256 reader started on cpu 0 writer started on cpu: 0 49536 != 49408 at offset 0 failure in chunk 330502 === Portaudio ringbuffer test === starting ringbuffer stress test (2 minutes max) buffer size (bytes): 512 array size (bytes): 256 reader started on cpu 0 writer started on cpu: 0 Success === Portaudio ringbuffer test (without memory barriers) === starting ringbuffer stress test (2 minutes max) buffer size (bytes): 512 array size (bytes): 256 reader started on cpu 0 writer started on cpu: 0 Success -- jörn nettingsmeier home://germany/45128 essen/lortzingstr. 11/ http://spunk.dnsalias.org phone://+49/201/491621 Kurt is up in Heaven now.

16 years, 11 months

ALSA sequencer question

by Julien Claassen

Hello! If I want to output a MIDI note to all channels, what do I have to assign to snd_seq_event_t *ev; ev->data.note.channel Is there a possibility to do so in one strike, or do I ave to iterate through all 16 channels? Kindest regards Julien -------- Music was my first love and it will be my last (John Miles) ======== FIND MY WEB-PROJECT AT: ======== http://ltsb.sourceforge.net the Linux TextBased Studio guide ======= AND MY PERSONAL PAGES AT: ======= http://www.juliencoder.de

16 years, 11 months

RME PCI Express card drivers

by Fons Adriaensen

Hello all, Could someone confirm / deny the availability of fully working drivers for the following: http://www.rme-audio.de/en_products_hdspe_madiface.php http://www.rme-audio.de/en_products_hdspe_expresscard.php I hear rumours that these are / may be available but would like to be 100% sure before planning to use them in a future project. TIA, -- FA Follie! Follie! Delirio vano e' questo!

16 years, 11 months

Re: [LAD] [Lash-dev] Re: LASH - some questions & comments

by Nedko Arnaudov

schoappied <schoappied(a)gmail.com> writes: > There is posted a message for testers here: > http://linuxmusicians.com/viewtopic.php?f=24&t=622 > and a discussion about lash here: > http://linuxmusicians.com/viewtopic.php?f=28&t=609 > > If you need testers in the future maybe good to left a message there > or/ and on the LAU mailinglist? Thank you for your forum post about rc1. Posting announce of rc1 to dev-only lists only was intetional. The reason is to avoid user frustration that can be caused by "unpolished" software. Also devs are supposed to be able to give better feedback for crashing software. If everything goes as I expect, rc2 announce will probably be posted in laa and lau mailing lists too. -- Nedko Arnaudov <GnuPG KeyID: DE1716B0>

16 years, 11 months

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Linux-audio-dev