Linux-audio-user

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20661 discussions

[linux-audio-user] alsa sequencer filter client

by Garett Shulman

Hello, I am trying to create a very simple midi filter client for the alsa sequencer based on aseqview-0.1.4. I have alsa 0.9.8. This code shows the input and the output port in aconnect when executed. And, when the raw_midi client is connected The callback does get called when I play keys on my piano. However, Its as though the message is getting sent back to this client and not on to the next client. The process_event function keeps getting called over and over again with the same message when I hit one piano key. It's as though it is sending itself the message. Any Ideas are greatly appreciated. -Garett #include "portlib.h" int process_event(port_t *p, int type, snd_seq_event_t *ev, int *priate_data) { port_write_event(p, ev, 0); } int main() { unsigned int caps = SND_SEQ_PORT_CAP_WRITE | SND_SEQ_PORT_CAP_SUBS_WRITE | SND_SEQ_PORT_CAP_READ | SND_SEQ_PORT_CAP_SUBS_READ; port_client_t *client = port_client_new("MIDI filter", SND_SEQ_OPEN_DUPLEX); port_t *port = port_attach(client, "FILTER port", caps, SND_SEQ_PORT_TYPE_MIDI_GENERIC); int *priv_data; /* add callback */ port_add_callback(port, PORT_MIDI_EVENT_CB, (port_callback_t)process_event, priv_data); port_client_do_loop(client); return port_detach(port); }

21 years, 9 months

[linux-audio-user] ecasound ???'s

by derek holzer

Hi all, I will be setting up an audio Linux box this spring for a museum exhibition that will run for about 4 weeks. It will probably run without an xserver and use Pure Data in --nogui mode since a GUI is not needed, and may turn itself on and off with a chronjob function. My question is this: since I want to document the sound of the exhibition, I would like ecasound to record from all four outputs periodically [also as a chronjob]. I am not too familiar with ecasound, but it seems like exactly the kind of low-overhead tool to do the job. So can anyone tell me how to capture from *outputs* and not inputs? thanks, Derek -- derek holzer ::: http://www.umatic.nl ---Oblique Strategy # 4: "Abandon desire"

21 years, 9 months

[linux-audio-user] Can't install a noteedit dependency

by Glenn McCord

One of the dependencies for noteedit is tse3 but during 'make' it cans out with this error: /usr/include/bits/stdio.h: In function `__ssize_t getline(char**, size_t*, FILE*)': /usr/include/bits/stdio.h:103: declaration of `__ssize_t getline(char**, size_t*, FILE*) throw ()' throws different exceptions /usr/lib/gcc-lib/i686-pc-linux-gnu/3.2.3/include/stdio.h:583: than previous declaration `__ssize_t getline(char**, size_t*, FILE*)' make[4]: *** [Demidify.lo] Error 1 make[4]: Leaving directory `/home/glenn/apps/tse3-0.2.7/src/tse3/util' make[3]: *** [all-recursive] Error 1 make[3]: Leaving directory `/home/glenn/apps/tse3-0.2.7/src/tse3' make[2]: *** [all-recursive] Error 1 make[2]: Leaving directory `/home/glenn/apps/tse3-0.2.7/src' make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory `/home/glenn/apps/tse3-0.2.7' make: *** [all] Error 2 Does anyone hava an ideas or should I just dig up a binary.

21 years, 9 months

[linux-audio-user] jack compiling problems with kernel 2.6

by Alexander Klosch

hi, I'm running gentoo/ppc on ibook rev 2.2 kernel 2.6.1_rc3 [including snd-powermac] and alsa-lib 1.0.1 when i compile jack I get following errors: [snip] checking for gethostent... yes checking for setsockopt... yes checking for connect... yes checking for on_exit... yes checking for atexit... yes JACK will use System V shm API (shmget() and friends) checking for capgetp in -lcap... no configure: WARNING: *** no libcap present configure: WARNING: *** required program md5sum not found configure: error: *** Capabilities support not present. Run configure again without --enable-capabilities. . but alsa is there and gives sound, no problems there. how to solve this? regards alex

21 years, 9 months

[linux-audio-user] Jack and SHM

by Christophe Vescovi

Since there has been a lot of post concerning jack usage and optimisation recently it has remind me a problem I got that I never been able to understand. I have never been able to run jackstart with -R option when compiling jack with Sys V shm support. jackd -R as root work with SysV shm but if I want to use jackstart I have to use POSIX shm. The error message I am getting with SysV shm is the classical "cannot lock down memory for RT thread (Cannot allocate memory)". I am running a Mandrake 9.2 multimedia kernel (2.4.22, low latency, preemption and capability patches). Since most of jack users seem to use SysV shm I don't understand why I cannot (I am the only exception ....) Christophe

21 years, 9 months

[linux-audio-user] 2nd LAD conference

by Matthias Nagorni

Hello, as announced earlier, the 2nd Linux Audio Developers conference will take place from 29. April to 2. May 2004 at ZKM (Center for Art and Media), Karlsruhe, Germany. In addition to the "Call for Papers" there is also a "Call for Music". Both are open until 29. February. We are looking for music that has been done with Linux Audio software and intend to present it in a concert at the "Kubus" concert hall of ZKM. "Live" performance with Linux Audio software is welcome as well. More information on the conference, registration, accomodation and the "Call for Music" is available from www.zkm.de/lad The current list of speakers (in alphabetical order) and talks is as follows: Fons Adriaensen, 1) AEOLUS - a church organ in your PC 2) Using JAAA for audio measurements Frank Barknecht, Rapid and Reuseable Audio Development With Pd Julien P. Claassen, Linux console - a textbased studio Paul Davis, Adding MIDI to a Digital Audio Workstation Orm Finnendahl, 1) Linux as a Workstation for Composers 2) PD Workshop Bob Ham, LADCCA Steve W. Harris and Jörn Nettingsmeier, Audio Engineering in a Nutshell Steve W. Harris, JACK, JAMin, Mastering Takashi Iwai, ALSA Sucks? - Trouble Shooting for Your Healthy Music Life Jaroslav Kysela, ALSA project - the last year Victor Lazzarini, Developing Spectral Signal Processing Applications Matthias Nagorni, Introduction to Modular Synthesis Han-Wen Nienhuys, LilyPond, a modular, extensible and programmable compiler for high-quality music notation Dave Phillips, 1) Keynote: One Year After: Notable Linux Audio Development in 2003 2) Still Nailing Jelly: An Update on Linux Audio Documentation Projects Abstracts and links to the respective projects are available at www.zkm.de/lad Matthias -- Dr. Matthias Nagorni SuSE Linux AG Maxfeldstr. 5 phone: +49 911 74053375 D - 90409 Nuernberg fax : +49 911 74053483

21 years, 9 months

[linux-audio-user] alsa mixer apps

by Florian Schmidt

Hi, i heard on the #alsa irc channel, that some graphical mixer apps don't treat the alsa mixer [ctl] devices not right. For example on a cs46xx alsamixergui does not allow toggling capture on the "Capture" channel. This would be required and is no problem with alsamixergui. I wonder if other mixers have problems like this. This can be confusing like Hell to newbies.. -- http://www.soundclick.com/bands/9/florianschmidt.htm http://www.arted.biz/mista.tapas

21 years, 9 months

[linux-audio-user] [ANN] Visecas 0.3.5

by Jan Weil

Announcing Visecas version 0.3.5. This is an interim release which fixes several serious bugs. Hacking Gtk::Fileselection from Ruby on a Debian system (which currently comes with a patched GtkFileselection) turned out to be a very bad idea regarding portability. New screenshots can be found on the web. Thanks to all those who reported their problems with version 0.3.1. Visecas is a graphical user interface (GTK+) for Ecasound [http://eca.cx/ecasound], a software package written by Kai Vehmanen which is designed for multitrack audio processing. It aims to provide full access to all Ecasound's object by preserving Ecasound's semantic (which means you do not edit tracks and regions but chains and audio objects). Please visit Visecas' webpage at http://visecas.sourceforge.net This release fixes: * broken audio objects' dialog * malformed preferences file crashes * silly behaviour with open/save as * crash once one of several chainsetups was closed * timeout problem (hopefully) * minor bugs Jan

21 years, 9 months

Re: [linux-audio-user] Audio 3-D Demo --- Any Interest in Software?

by davidrclark＠earthlink.net

Hi Andreas, Thanks for your query, but I was unable to send email to your location from mine due to email restrictions on your end --- so I'm hoping you'll see this. Please let me know if you do. I hope it's OK to reply through the mailing list because I don't have any other way of contacting you. (BTW: Do other LAU people have the problem wherein they are contacted by a reader only to find that they cannot respond? What should we do in this situation? Is use of this list OK?) I'm developing this software as a research product into computational acoustics. I haven't decided what type of licenses to offer, but I'm leaning towards GPL or similar. Regards, Dave. Replying to: >Hello David, > >is that software available under an Open Source license or is it a >commercial product ? > >Cheers, >Andreas

21 years, 9 months

[linux-audio-user] Re: linux-audio-user Digest, Vol 4, Issue 55

by David Baron

How does one do this? On Thursday 22 January 2004 10:54, linux-audio-user-request(a)music.columbia.edu wrote: > On Thu, Jan 22, 2004 at 09:46:31AM +0100, David Baron wrote: > > Seen references to problems with audio. What is the issue here? > > If your jack fifos are stored in a journaled filesystem (eg. reiser or > etx3) it can cause latency problems. > > The fix is to mount a filesystem as tmpfs and tell jack to put its fifos > there. > > - Steve

21 years, 9 months

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Linux-audio-user