Linux-audio-dev October 2008

linux-audio-dev@lists.linuxaudio.org

52 participants
38 discussions

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).

17 years

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.

17 years

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.

17 years

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

17 years

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!

17 years

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>

17 years

[ANN] lash-0.6.0 release candidate 1

by Nedko Arnaudov

I would like to ask LASH beleivers and other interested parties to test the first release candidate for 0.6.0. Juuso Alasuutari and me have been doing some major changes to the lash code. We have done lot of work, we've fixed several big implementation issues and we need stable point before doing more changes (0.6.1 and 1.0 milestones). In the tarball there is simple lash_control script. One can also control LASH through patchage-0.4.2 and through lpatchage (availabe through git). User visible changes since 0.5.4: * Use jack D-Bus interface instead of libjack, enabled by default, can be disabled. Ticket #1 * Allow controlling LASH through D-Bus. Ticket #2 * Use D-Bus autolaunching instead of old mechanism. Ticket #3 * Log file (~/.log/lash/lash.log) for LASH daemon. Ticket #4 * Client stdout/stderr are logged to lash.log, when clients are launched by LASH daemon (project restore). Ticket #5 * Improved handling of misbehaved clients. Ticket #45 * Projects now can have comment and notes associated. Ticket #13 Download: http://download.savannah.gnu.org/releases/lash/lash-0.6.0~rc1.tar.bz2 http://download.savannah.gnu.org/releases/lash/lash-0.6.0~rc1.tar.bz2.sig -- Nedko Arnaudov <GnuPG KeyID: DE1716B0>

17 years

[IDEA] Amp and effects modeling software for guitar

by almbfsek＠turk.net

Hello, Few days ago I came up with an idea about an open source guitar modeling software. But because of my lack of knowledge on both electronics and audio engineering I couldn't decide if it worths something. Here it is directly quoted from linuxmusicians.com **QUOTE** Okay! My idea is to use GNUCAP or SPICE to process the guitar signal. These are the top open source analog circuit simulators that are also widely used in the industry for general purpose circuit simulation (not audio specific). You basically feed them the schematics of a circuit and wait for magic to happen. I believe they may be hacked to accept a guitar signal as a varying voltage source. Now there are 3 questions: Is that even possible? If yes, is it possible in real-time? If yes, would results be satisfying (quality and accuracy wise) **END_QUOTE** thanks very much, and sorry in advance if I missed something obvious and this is a completely useless idea

17 years

Re: [LAD] [IDEA] Amp and effects modeling software for guitar

by almbfsek＠turk.net

It would be great though since it would take a minimal amount of effort to make it work with a guitar signal but no real-time means the end of this idea thanks very much for the quick answers

17 years

SMDITools with ESI4000 (Ubuntu Studio 8.04)

by Dan Richert

I'm trying to set up an E-Mu ESI4000 sampler for SMDI sample transfers on Ubuntu Studio 8.04, but I'm having some trouble figuring out how to communicate with the sampler. OpenSMDI relies on SCSI devices being listed as /dev/sga[a-n] and the SMDITools docs suggest setting up a symlink if SCSI devices aren't listed that way on the system you're using. The problem is that it appears that the ESI4000 is not being associated with a device file. Here's the output from lsscsi: [0:0:0:0] disk ATA WDC WD800JB-00FM 13.0 /dev/sda [1:0:0:0] cd/dvd HL-DT-ST RW/DVD GCC-4521B 1.00 /dev/scd0 [1:0:1:0] cd/dvd SONY CD-RW CRX230EE 2YS3 /dev/scd1 [2:0:4:0] process E-mu ESi-4000 Sampler 3.02 - [2:0:4:1] process E-mu ESi-4000 Sampler 3.02 - [2:0:4:2] process E-mu ESi-4000 Sampler 3.02 - [2:0:4:3] process E-mu ESi-4000 Sampler 3.02 - [2:0:4:4] process E-mu ESi-4000 Sampler 3.02 - [2:0:4:5] process E-mu ESi-4000 Sampler 3.02 - [2:0:4:6] process E-mu ESi-4000 Sampler 3.02 - [2:0:4:7] process E-mu ESi-4000 Sampler 3.02 - [2:0:5:0] disk IOMEGA ZIP 100 K.05 /dev/sdb The SCSI ID setting on the ESI4000 itself is set to 4. There is an Iomega Zip 100 drive (SCSI ID 5) between the sampler and the computer. SMDITools/OpenSMDI can be found at http://nolv.free.fr/SMDITools/ Thanks, Dan

17 years

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Linux-audio-dev October 2008