Linux-audio-dev October 2007

linux-audio-dev@lists.linuxaudio.org

46 participants
27 discussions

by Avadhoot Punde

Hi all As part of a bigger project, I need to develop a module which reads PCM data from a file and feeds it to sound driver. Is it possible to develop such a module without actually writing device driver, I mean just by using existing functions such as snd_pcm_open and all that ? Can someone throw more light on this ? Regards, Avadhoot

17 years

[OT] F7 security

by Fons Adriaensen

Somehat off-topic, but at least it's about systems to be used for audio exclusively... Help ! I'm struggling to get 5 computers running F7 configured. In the Gnome destop there's the app that lets you configure the firewall and selinux. It asks for the root password so I assume that when that's given I can do what I like. But everything I modify there (adding allowed ports for some networked audio apps) is silently ignored. Same if I try to disable the firewall. I must be ignoring something very simple... -- FA Laboratorio di Acustica ed Elettroacustica Parma, Italia Lascia la spina, cogli la rosa.

17 years

Re: [LAD] [LAU] [ANN] a2jmidid version 2 released

by Nedko Arnaudov

Ken Restivo <ken(a)restivo.org> writes: > On Sat, Oct 27, > 2007 at 04:40:59PM +0300, Nedko Arnaudov wrote: >> a2jmidid is daemon for exposing legacy ALSA sequencer applications >> in JACK MIDI system. It is based on jack-alsamidi-0.5 (jackd alsa >> seq midi backend) by Dmitry Baikov. The main purpose is to ease >> usage of legacy, not JACK-ified apps, in JACK MIDI enabled systems. [snip] > Now, just to make sure I understand: this is for people who are using > released versions of jackd that *do* suppport JACK MIDI (i.e 0.103.0), > but aren't using the lastest jackd from SVN which has suport for the > -X option to do this functionality within jackd, correct? It will help them, but not with hardware ALSA seq MIDI ports, because currently a2jmidid ignores them. This can be fixed easily in code until a2jmidid gets more configurable. > Once there's a new jackd release, with the -X option, will this too be > needed anymore? It will still be needed for users that want using raw ALSA MIDI backend (and skipping additional ALSA sequencer layer). This is setup I have here, I use -X raw but I still need connecting legacy ALSA MIDI apps to JACK MIDI apps. Althrough not intentional, it may help for JACK drivers that don't support JACK MIDI nativily yet. IIRC JACK MIDI ffado driver support is not ready yet. -- Nedko Arnaudov <GnuPG KeyID: DE1716B0>

17 years

[ANN] a2jmidid version 2 released

by Nedko Arnaudov

a2jmidid is daemon for exposing legacy ALSA sequencer applications in JACK MIDI system. It is based on jack-alsamidi-0.5 (jackd alsa seq midi backend) by Dmitry Baikov. The main purpose is to ease usage of legacy, not JACK-ified apps, in JACK MIDI enabled systems. New in this release is addition of configure script (autotools) that enables compatibility with different JACK MIDI API variants. Planned features/improvements: * One JACK client per ALSA sequencer client * More control on what ports to bridge (currently bridging is fixed to non-hardware ports). * Real daemonization with log file, init.d script, etc. If someone wants to contribute please, contact me, or send patches, or request inclusion (Gna! a2jmidid project). As usual, packagers are more than welcome too. Homepage with screenshots: http://home.gna.org/a2jmidid/ Tarball download: http://download.gna.org/a2jmidid/ -- Nedko Arnaudov <GnuPG KeyID: DE1716B0>

17 years

[PATCH] japa-0.2.1 colors customizability improvement

by Nedko Arnaudov

Here is a tiny patch to improve japa-0.2.1 colors customizability. I created it to achieve outlook that can be seen here: http://nedko.arnaudov.name/soft/japa-0.2.1-colors.png I'm also attaching configuration file I use to achieve the outlook. FYI, example conf file is missing from 0.2.x tarballs, despite of what is said in the README. -- Nedko Arnaudov <GnuPG KeyID: DE1716B0>

17 years

ICE1712 [Envy24] and Master volume

by Stefan Kost

hi, sorry for off-topic post. I have a Hoontech DSP 2000 (Envy24) based soundcard. It works fine with the Envy24 control utility and also to some extend with the gnome-volume-control (gnome-mixer). One annoyance is that there is no master volume. I've routed PCM1/2 to the digital mixer but fail to find any control for digital mixers master volume. Did anyone had more luck with this? Stefan

17 years

Vamp plugin SDK v1.1b now available

by Chris Cannam

Version 1.1b of the Vamp plugin SDK is now available. http://www.vamp-plugins.org/ Vamp is a plugin API for audio analysis and feature extraction plugins written in C or C++. Its SDK features an easy-to-use set of C++ classes for plugin and host developers, a reference host implementation, example plugins, and documentation. It is supported across Linux, OS/X and Windows. Version 1.1b is a minor update with a small number of build and bug fixes. The prior version 1.1 of the SDK introduced a new set of classes designed to make it very simple for an application to use Vamp plugins, without needing to do complicated plugin lookup or audio processing themselves. Plugins and hosts remain 100% binary compatible with those built using the 1.0 version of the SDK. Chris

17 years

Linux Audio Conference #6 (LAC2008): Reminder: Call for Installations ends tonight!

by Martin Rumori

Dear all, we would like to remind you that the submission deadline for installation proposals for the exhibition at Linux Audio Conference 2008, 28.2.-2.3.2008 at Cologne, ends tonight. Please find the full call for installations below and on the web at http://lac.linuxaudio.org This site also contains all the other calls, which remain open until 1st of december. On behalf of the LAC2008 organisation team, sincerely, Frank Barknecht and Martin Rumori

17 years, 1 month

Develop a virtual sound card driver.

by Luis Agustín Nieto

Hello Everyone, We wish to undertake a new project for college (we are students of Computer Science at University of Buenos Aires) and the idea is to develop a virtual sound card driver which is capable of capturing the sound output generated by any standard Linux application, in order to do something with these data (for example dumping them to a file). We are not sure about which level this driver should be implemented at. We would like to avoid, when possible, any low level or hardware related dealing. One approach that we've been considering is to write something at the same level of ALSA or OSS (i.e. with the same API), which somehow could be registered in the system and made available to the "client" app's as another selectable sound system. We are a little confused about the Linux's sound architecture and would like to have some starting point to begin dealing with this project. We would appreciate any help. Thanks in advance.

17 years, 1 month

Q 7.8 released

by Albert Graef

Hi all, I've just released Q 7.8 which sports some important bugfixes and some nice new features. The most important addition probably is that Q now has a complete Qt interface. You can find the sources and a ready-made RPM for Linux (which contains almost everything surrounding Q, including the interfaces to Faust, MidiShare, Pd and SuperCollider and the multimedia examples) on the Q download page: http://q-lang.sourceforge.net/download.html For those of you who haven't heard about Q yet: It is a GPLed, modern-style functional programming language with good library support for multimedia and computer music applications. (Somewhat like Haskell, but interpreted and dynamically typed, and with much better system and multimedia libraries.) More information about Q can be found on the Q website at: http://q-lang.sourceforge.net Enjoy. :) Albert -- Dr. Albert Gr"af Dept. of Music-Informatics, University of Mainz, Germany Email: Dr.Graef(a)t-online.de, ag(a)muwiinfa.geschichte.uni-mainz.de WWW: http://www.musikinformatik.uni-mainz.de/ag

17 years, 1 month

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Linux-audio-dev October 2007