Linux-audio-dev

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7501 discussions

[EPAMP] an effect plugin API for media players: anyone interested?

by Stefano D'Angelo

Hello, First of all, I'm sorry for the worst cross-posting ever. My name's Stefano D'Angelo and I'm the author of NASPRO (http://naspro.atheme.org), a project whose main aim is to build up a system to make all sound processing APIs interoperable. Since my project was recently accepted to become part of the Atheme community (http://www.atheme.org) and began working close to the audacious (http://audacious-media-player.org) developers, I could see there actually were serious reasons behind the lack of standardization for sound processing in the arena of media players. Now, I wrote a first draft of a new sound processing API called EPAMP especially targetted at media players; you can find it here: http://naspro.atheme.org/content/epamp-draft-1 With this mail, I'm trying to get some feedback (possibly in the Talk page on the NASPRO wiki) about it and possibly to involve anyone who is interested in its development. Anyway, notice that the user interface part of the API is still missing and that my project (NASPRO) will support this new API, giving applications using it the possibility to access non-EPAMP plugins without touching a single line of code (currently supported APIs are audacious' and LADSPA, while DSSI, LV2, GStreamer and possibly VST are more or less planned for the near future). In case you're not interested and want to start a flame, please just ignore me. This message is being sent to the communities/developers behind the following projects: - Amarok - Aqualung - Audio Overload - BMPx - Banshee - cmus - Decibel Audio Player - Exaile - FALF Player - Freevo - GStreamer - Helix Player - Herrie - JaJuk - JuK (KDE multimedia) - Linux Audio Developers - KPlayer - Kaffeine - lamip - The LAMP - MPlayer - Miro - mpg123 - mpg321 - Muine - MPD - music on console - Noatun - ogg123 (vorbis-tools) - Ogle - Quod Libet - Rhythmbox - Sipie - SnackAmp - Sonata - Songbird - UADE - SMPlayer - VLC - wxMusik - XMMS2 - Xfmedia - Xine - Zinf If you know someone else who could be interested, feel free to forward this. Best regards, Stefano D'Angelo zanga.mail(a)gmail.com

17 years

alsa sequencer and sysex editing

by rdxesy＠yahoo.de

hello ") Ok, I am writing a remote and SysEx-editor for e-mu synthesizers (http://ppcontrol.sf.net). I am asking for help on how to use the alsa sequencer the way it was intended to be used for this kind of application. You know, there are so many options and flags and stuff to be used and I feel a little lost. Basically I send a lot of SysEx messages and need to make sure to catch all the answers. My current implementation is as following: I have a single sequencer (duplex, nonblocking), a queue and two ports: one with read and one with write caps. To send a SysEx command I just queue an event with that message. (So far so good?). Now I just wait for an constant time (usleep) before I check the input queue. Problem: if the time is too short, i would have missed the answer, if I wait to long I waste time. My question is: how would I make sure to catch all answers from the device without using a thread and without just waiting for an constant time before I check if there is an answer( which is alo not very fail save, a message might take a little longer if there is traffic on the midibus)? Thank you. Jan

17 years

LADSPA latency port, was Re: Let's kill EPAMP???

by Chris Cannam

On 03/06/2008, Steve Harris <steve(a)plugin.org.uk> wrote: > In LADSPA there's a "magic" control out port called "_latency" or > something, that should apply to LV2 aswell, but I'm not sure if the > spec says so. For the record -- since this is something I've tried to search for in the past and have had trouble finding a definitive answer to -- the conventional LADSPA port name is apparently "latency", with no underscore. Some hosts (such as Rosegarden) will accept either "latency" or "_latency"; in RG's case that's because I wasn't sure which was supposed to be correct when I coded it. But others (such as Ardour) will only accept "latency", as I discovered when I released a plugin that used "_latency" and forgot to test it in Ardour first. Chris

17 years, 1 month

[EPAMP] an effect plugin API for media players: anyone interested?

by Stefano D'Angelo

17 years, 1 month

Re: [LAD] [EPAMP] an effect plugin API for media players: anyone interested?

by Sampo Savolainen

Quoting Stefano D'Angelo <zanga.mail(a)gmail.com>: > It would work like this: > > stereo input -> hosts converts to 5.1 (the effect states it needs 6 > channels) -> apply effect with 6 in channels and 6 out channels -> 5.1 > output How would the host convert the stereo input to 5.1? In my view, that is the whole purpose of the effect. Sampo

17 years, 1 month

LAC on German radio

by Frank Barknecht

Radio Recommendation For those interested in Linux Audio, Pd, SuperCollider, .... It's in German, though. Streaming info: http://www.dradio.de/streaming/ The HQ-Ogg-stream is the best: http://www.dradio.de/streaming/dkultur_hq_ogg.m3u Deutschlandradio Kultur - Neue Musik - 03.06.2008 - 00:05 CEST(!) Musik aus dem digitalen Baukasten Die Linux Audio Conference 2008 in Köln Von Hubert Steins Computer sind erschwingliche, universelle Musikmaschinen. Doch die vermeintliche Freiheit trügt, denn Softwaregiganten wie Microsoft und Apple dominieren das Innenleben auch der Musikrechner. Künstlerische Autonomie erfordert aber Kontrolle über die Produktionsmittel, sagen viele Musiker und Medienkünstler, die deshalb das quelloffene Linux-Betriebssystem einsetzen. Einmal im Jahr treffen sich die Linuxmusiker zur Linux Audio Conference, zuletzt im Frühjahr 2008 an der Kunsthochschule für Medien in Köln. Die Szene ist bunt: Die Präferenz für Linux als Betriebssystem ist der gemeinsame Nenner, der hier Komponisten akademischer Neuer Musik mit Technomusikern oder den Programmierern von Aufnahmesoftware an einen Tisch, auf eine Bühne bringt. Für Deutschlandradio Kultur hat Hubert Steins die Protagonisten der Szene wie den Musiker und Mathematiker Miller Puckette getroffen http://www.dradio.de/dkultur/programmtipp/vorschau/793304/ Ciao -- Frank Barknecht _ ______footils.org__

17 years, 1 month

lo_server_thread_new pause

by Dave Griffiths

Hi all, I think this is a network setup user error rather than anything complicated, but anyone know why I get long pauses (5-10secs) when calling lo_server_thread_new for the first time in a process? Is it likely to be some timeout I can adjust? cheers, dave

17 years, 1 month

[ANN] set_rlimits 1.3.0

by Jonathan Woithe

Set_rlimits 1.3.0 has been released. This release integrates a Makefile patch by Lucas C. Villa Real and adds an option to specify non-standard library locations (which must be secured directories) via LD_LIBRARY_PATH to the called executable. It is available from http://www.physics.adelaide.edu.au/~jwoithe/set_rlimits-1.3.0.tgz Regards jonathan

17 years, 1 month

[ANN] DRC 2.7.0

by Denis Sbragion

Hello, DRC 2.7.0 is out and is available at: http://drc-fir.sourceforge.net/ Here are the release notes: A new method for the computation of the excess phase component inverse, based on a simple time reversal, has been introduced. The sample configuration files have been rewritten to take advantage of the new inversion procedure. Sample configuration files for 48 KHz, 88.2 KHz, 96 KHz sample rates have been added. The homomorphic deconvolution procedure has been improved to avoid any numerical instability. A new Piecewiswe Cubic Hemite Interpolating Polynomial (PCHIP) interpolation method, providing monotonic behaviour, has been introduced in the target response computation. All the interpolation and approximation procedures have been rewritten from scratch to provide better performances and accuracy. Bye, -- Denis Sbragion InfoTecna Tel: +39 0362 805396, Fax: +39 0362 805404 URL: http://www.infotecna.it

17 years, 1 month

vectorization

by Malte Steiner

Hello, I try to squeeze as much performance as possible out of my upcomming Linux synthesizer and try manual vectorization with following construct in c, mainly to vectorize away multiplications : typedef float v4sf __attribute__ ((vector_size(16))); union f4vector { v4sf v __attribute__((aligned (16))); float f[4] __attribute__((aligned (16))); }; On AMD 64bit Turion (single core) on 64 Studio in 64bit mode this doesnt improve performance at all, actually it even get worse. Is GCC that good at optimizing on its own? I have no access to Intel processors at the moment but would love to know how to benefit from SIMD optimizations of float operations. Sources on the web are rather thin... Cheers, Malte -- Malte Steiner media art + development -www.block4.com-

17 years, 1 month

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Linux-audio-dev