Linux-audio-dev

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7516 discussions

by Luis Garrido

> What do you mean by "limiter upfront". I am not an audio mixer studio > expert. Is this something for the detection of clipping in the audio > path? If so, I am afraid that I don't know of any sound card hardware > that has that feature. > The Edirol UA-25 has, and so have other Edirol models, I think. Cheers, Luis

20 years, 2 months

[linux-audio-dev] OSX Driver

by Jens M Andreasen

Hi all! As is apparent from my recent posts, I bought into a Behringer product recently ... I asked for feedback here, and how to improve support for linux and I have also actively tried to change their misleading web .. Heh .. They have changed the wording from "not supported by other OS" to "other OS such as win95 ..." Anyways ... After bitching around a bit more regarding implementation of their firmware, I get the question: "Can you program drivers for MAC OS-X, or do you know someone who can? I have answered that developer.apple.com have all the information I need, but also that there are several people around here working in mixed environments ... I promised to ask around. Any takers for a Mac OS X driver? mvh // Jens M Andreasen

20 years, 2 months

[linux-audio-dev] Radio Scanner Recorder

by Guillaume Filion

Hi all, I'm pretty new to the world of audio on linux, so please excuse the "newbeeness" of my question. :-) I'm a in the process of making a police/EMS/fire radio recorder. At first, I tought of doing a program similar to ScanRec(1) from the windows world -- that is not record when the sound is below a certain threshold. This could easily be done with ecasound's -ge parameter. However, I started thinking and found that it would be better to have a different file for each segment. For example, if there is - 45 seconds of speech, followed by - 3 minutes of silence, followed by - 2 minutes of speech I would get two files, one 45 seconds long and one 2 minutes long. Does such a program allready exists, and if not, what would be the best/easiest way of doing it? 1: http://www.davee.com/scanrec/ Thanks a lot, GFK's -- Guillaume Filion, ing. jr Logidac Tech., Beaumont, Québec, Canada - http://logidac.com/ PGP Key and more: http://guillaume.filion.org/

20 years, 2 months

[linux-audio-dev] Alsa Sequencer Raw MIDI Data

by Dirk Jagdmann

Hello Developers, I'm currently developing an application which should be controlled via MIDI. I'd like to use the Alsa Sequencer API, so I can use aconnect and friends to connect my app to other apps and MIDI hardware. However I like to get access and send the raw MIDI stream. So far I only saw code which use the snd_seq_event_input() call which already parsed the MIDI data. Is there another function which lets me access the latest received MIDI bytes? Or does the snd_seq_event_t struct contain the raw bytes? -- ---> doj / cubic ----> http://cubic.org/~doj -----> http://llg.cubic.org

20 years, 2 months

[linux-audio-dev] USB: Is a CLASS_INTERFACE request a kind of control transfer ?

by Jan Holst Jensen

Dear wise members of the list. I am (still) trying to implement a control panel feature for the U2A USB sound card. I (finally!) have the alsa patch from Clemens Ladisch up and running - at least I can compile a small program that when run squirts of a small control transfer URB to the sound card without complaints. Now, half of the URBs sent to the device are CONTROL_TRANSFER blocks, but the other half are marked as CLASS_INTERFACE in the SnoopyPro logs. See a typical example below. I have googled the net and searched the USB specs without getting much wiser as to what a CLASS_INTERFACE request is and does. Can I send it using CONTROL_TRANSFER URBs or is yet another extension of the alsa driver necessary ? Cheers -- Jan Holst 277 out down n/a 710.461 CLASS_INTERFACE 01 URB Header (length: 80) SequenceNumber: 277 Function: 001b (CLASS_INTERFACE) PipeHandle: 00000001 SetupPacket: 0000: 00 01 00 01 00 04 ea 87 bmRequestType: 00 DIR: Host-To-Device TYPE: Standard RECIPIENT: Device bRequest: 01 CLEAR_FEATURE TransferBuffer: 0x00000001 (1) length 0000: 01 277 out up n/a 710.471 CONTROL_TRANSFER - 0x00000000 URB Header (length: 80) SequenceNumber: 277 Function: 0008 (CONTROL_TRANSFER) PipeHandle: 860fee14 SetupPacket: 0000: 21 01 00 01 00 04 01 00 bmRequestType: 21 DIR: Host-To-Device TYPE: Class RECIPIENT: Interface bRequest: 01 No TransferBuffer __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

20 years, 2 months

Re: [linux-audio-dev] Radio Scanner Recorder

by Jonathan Woithe

Hi Guillaume > I'm a in the process of making a police/EMS/fire radio recorder. ... > However, I started thinking and found that it would be better to have a > different file for each segment. For example, if there is > - 45 seconds of speech, followed by > - 3 minutes of silence, followed by > - 2 minutes of speech > I would get two files, one 45 seconds long and one 2 minutes long. > > Does such a program allready exists, and if not, what would be the > best/easiest way of doing it? Although it uses the OSS API, you might like to take a look at batchrec-1.2.0, available in source-form only on my website at http://www.physics.adelaide.edu.au/~jwoithe There's no autoconf support, but it shouldn't be difficult to get going on any modern Linux distro, and is reasonably well documented via the "-h" command line parameter. It's tested and developed under Slackware. >From the sound of your description, batchrec will probably do what you want. The code is a little "quick and dirty" and probably needs tidying up, but it does the job. It's textmode only at this point mainly because I can't be bothered writing a GUI for it at the moment. You also get levelmeters to monitor the level coming in. It's OSS-only because for me it works, does what I need and I've been short of time in recent months. I have been toying with the idea of writing a native ALSA and/or jack backend to it, but that is probably a way off yet. Anyway, have a look and see if it does what you need. Perhaps contact me off-list if you have specific followup questions. Regards jonathan

20 years, 2 months

[linux-audio-dev] [ANN] Linux Audio Conference (LAC2006) dates

by Frank Neumann

Hi all, this is a pre-announcement to inform you that the 4th International Linux Audio Conference (or LAC2006 for short) will take place on Thursday, April 27th - Sunday, April 30th, 2006 at the ZKM in Karlsruhe, Germany It will again be supported by the Institute for Music and Acoustics of the ZKM, and will be (most probably) organized by Goetz Dipper of said institute and myself. We are only starting up the organizational work right now, so this is not the formal Call for Papers/Music/Workshops yet - that will follow in early October (and will look similar to that of last year). This mail is only to allow you to plan for this conference early and think about possible topics that you might want to present. Oh, and we will also need helping hands for all kinds of work - any offers to work with us on planning and running the conference are most welcome. Questions about the conference can already be sent to our "OrgaTeam" list address at lac2006 at zkm dot de. The web page for the conference is again at http://lac.zkm.de - though there is no new content yet. More details, as mentioned, in October. Greetings, Frank and Goetz

20 years, 2 months

Re: [linux-audio-dev] Behringer firmware update

by Pedro Lopez-Cabanillas

> Now, what would an amidi command look like that guarantees to update > each and every midi-device found with said sysex file? amidiall.sh ----CUT---- #!/bin/bash CMD=$(which amidi) PORTLIST=$($CMD -l|awk '/^hw:/ { print $1 }') for P in $PORTLIST; do echo "$CMD --port=$P $*" $CMD --port=$P $* done ----CUT---- Usage: $ amidiall -s myfile.syx Regards, Pedro

20 years, 2 months

[linux-audio-dev] JackMix 0.1.0 released

by Arnold Krille

Yes, after more than a year there is another JackMix release! If you just want to download it: http://dillenburg.dyndns.org/~arnold/node/267 (also has some comments and install-instructions) You don't know what JackMix is? - It aims to be a mixing-console for your computer. It uses Jack, the professional sound server and does pure mixing, no effects or routing (there are other good apps for that). For more info read http://dillenburg.dyndns.org/~arnold/wiki/goto/JackMix:intro This new release includes a dir where I did some first tests with OSC, which I plan to use for communication between the mixer-server and the gui(s). Until now its just a lib and two test-apps in that dir. If you want, you can take a look at it... Some other concepts[*] are about to find their way into JackMix real soon, which implies another phase of heavy rewriting (and not so many releases). Have a nice day, Arnold [*] Reading "Design Patterns" is truly inspiring... -- visit http://dillenburg.dyndns.org/~arnold/ --- Wenn man mit Raubkopien Bands wie Brosis oder Britney Spears wirklich verhindern könnte, würde ich mir noch heute einen Stapel Brenner und einen Sack Rohlinge kaufen.

20 years, 2 months

[linux-audio-dev] Behringer firmware update

by Jens M Andreasen

Hi! So I counted the pennies, scratched my head more than twice, investigated alternatives, slept unruly and finally decided that a BCR2000 is the way to go. phew ... :) I have a firmware update here, looks like a sysex block (F0 ... ... F7) and with the filename extender 'syx' I am pretty sure it is so. In order to improve Behringers support for Linux, I should give some feedback, right? They have a failproof update.exe solution for Windows (but none for Mac nor Linux.) As far as I can see, this is the kind of job 'amidi' was designed to do. Now, what would an amidi command look like that guarantees to update each and every midi-device found with said sysex file? mvh // Jens M andreasen

20 years, 2 months

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Linux-audio-dev