Linux-audio-dev September 2012

linux-audio-dev@lists.linuxaudio.org

30 participants
18 discussions

by Pedro Lopez-Cabanillas

On Friday 06 January 2012, you wrote: > btw: is there a way to list available clients/ports from the api. > I know that aconnect -i / -o does this, but is there a c/c++ function? > > Dave The functions are: snd_seq_query_next_client() and snd_seq_query_next_port(); you need to loop calling these functions while they return a correct answer. For instance, this is the relevant code in "aconnect.c" : static void do_search_port(snd_seq_t *seq, int perm, action_func_t do_action) { snd_seq_client_info_t *cinfo; snd_seq_port_info_t *pinfo; int count; snd_seq_client_info_alloca(&cinfo); snd_seq_port_info_alloca(&pinfo); snd_seq_client_info_set_client(cinfo, -1); while (snd_seq_query_next_client(seq, cinfo) >= 0) { /* reset query info */ snd_seq_port_info_set_client(pinfo, snd_seq_client_info_get_client(cinfo)); snd_seq_port_info_set_port(pinfo, -1); count = 0; while (snd_seq_query_next_port(seq, pinfo) >= 0) { if (check_permission(pinfo, perm)) { do_action(seq, cinfo, pinfo, count); count++; } } } } See: http://git.alsa-project.org/?p=alsa-utils.git;a=blob;f=seq/aconnect/aconnec… I guess you already know the reference documentation site: http://www.alsa-project.org/alsa-doc/alsa-lib/seq.html Just for comparison, a similar enumeration using Drumstick looks like this: QListIterator<PortInfo> it(m_Client->getAvailableOutputs()); while(it.hasNext()) { PortInfo p = it.next(); cout << p.getClientName() << ":" << p.getPort(); } See Drumstick's example "drumgrid": http://drumstick.sourceforge.net/docs/drumgrid.cpp-example.html Regards, Pedro

11 years, 6 months

Four decks audio player for radio stations

by Adrian Knoth

Hi! I was recently helping a small Dutch radio station run by volunteers to set up their new studio. It's a modular system with a 16 I/O firewire card: http://www.d-r.nl/AXUM/AXUM.htm We managed to support it in FFADO. The playback software runs on a virtualised Windows machine that's talking to jackd via netjack (no idea which one, the one with multicast and netmanager), so we can address four individual stereo pairs. This whole netjack thing isn't very stable, so the playback software should be replaced by some native Linux client. Here's a screenshot of the current Windows solution: http://adi.loris.tv/radio.png It is basically a set of four remotely controlled winamps (with ASIO output plugin to talk to jackd) and a directory browser per player. So "Jingles", "Muziek" and "Bladeren" are just shortcuts to directories with media files, the drop-down menu on the left contains a list of even more directories. The filter is used for pattern matching. Questions: Are you aware of any Linux solution that comes close to this? If not, any recommendations if one would want to create such a four-deck player? Leveraging VLC, mplayer, gstreamer? This is surely going to be open source, so whoever is interested, feel free to participate. Cheers

11 years, 10 months

[ANN] Praxis LIVE build:120912

by Neil C Smith

Hi All, Praxis LIVE is an open-source, graphical environment for rapid development of intermedia performance tools, projections and interactive spaces. A new build of Praxis LIVE is now available for download. While this is mainly a bug fix release, it does see the Praxis command line player added to the main installation, and work which paves the way for distributing Praxis projects as standalone applications (coming separately in the next couple of weeks). Website - http://code.google.com/p/praxis Release notes - http://code.google.com/p/praxis/wiki/ReleaseNotes Videos - http://praxisintermedia.wordpress.com/2012/07/30/video-rough-cuts-1/ If any of you who've been playing with Praxis LIVE would be interested in submitting example projects for the next release, please get in touch with me off-list. Thanks and best wishes, Neil -- Neil C Smith Artist : Technologist : Adviser http://neilcsmith.net

12 years, 2 months

meterbridge 0.9.2 IEC-scale bug & fix

by Robin Gareus

Hi there, Does anyone have Steve Harris' new email address? steve(a)plugin.org.uk fails with "550 5.1.2 Bad destination system address". Anyway, some of you who package or copied code from meterbridge may be interested in this as well. -=-=-=-=- Hi Steve, Haven't seen you around much on LAD. I hope this email finds you well. Are you still maintaining meterbridge? I've stumbled over a bug in 0.9.2 The IEC scale is not continuous. Attached patch resolves the issue. I don't have access to the IEC-268-18 specs, so I can't tell if the patch is correct, but it does fix the discontinuity between -60db and -50db. To make it obvious, here's the annotated iec_scale(float db): if (db < -70.0f) { def = 0.0f; } else if (db < -60.0f) { def = (db + 70.0f) * 0.25f; // 0.0 .. 2.5 } else if (db < -50.0f) { // def = (db + 60.0f) * 0.5f + 5.0f; // 5.0 .. 10.0 // bug? v0.9.2 def = (db + 60.0f) * 0.5f + 2.5f; // 2.5 .. 7.5 // fix! } else if (db < -40.0f) { def = (db + 50.0f) * 0.75f + 7.5; // 7.5 .. 15.0 } else if (db < -30.0f) { def = (db + 40.0f) * 1.5f + 15.0f; // 15.0 .. 30.0 } else if (db < -20.0f) { def = (db + 30.0f) * 2.0f + 30.0f; // 30.0 .. 50.0 } else if (db < 0.0f) { def = (db + 20.0f) * 2.5f + 50.0f; // 50.0 .. 100.0 } else { def = 100.0f; } Furthermore, the DPM image has a couple of problems: The markers at -10, -19, -20, -25, -30, -35, -55 are off by one pixel (they need to be moved 1px down), the -45db marker is correct. The marks for -40, and -50 are missing and it's easy to mistake the -45db and -55db marks to correspond to the -40db, -50db annotations. Last but not least, the minus-signs of all annotation does not align with the marks and the font used for the annotation text is somewhat blurry.. All fixed in attached image. Cheers! robin

12 years, 2 months

zretune app added to libzita-resampler

by Fons Adriaensen

Hello all, Release 1.2.0 of libzita-resampler now include the 'zretune' app which resamples an audio file by (the inverse of) a ratio given in cents. The output file will have the same nominal sample rate as the input. The effect is to change the pitch AND the lenght of the original file. For small pitch changes (+/- a semitone) the modified length of a sample probably won't matter much. For example zretune --cent 50 input.wav output.wav will result in a file that sounds a quarter tone higher and is about 1.5 percent shorter. Enjoy ! -- FA A world of exhaustive, reliable metadata would be an utopia. It's also a pipe-dream, founded on self-delusion, nerd hubris and hysterically inflated market opportunities. (Cory Doctorow)

12 years, 2 months

LAO scheduled downtime

by Robin Gareus

Hi all, Ico - director of linuxaudio.org - arranged to quadruple the disk-space for our servers. Amongst other things, this will allow us to host large sample-collections (an endeavor Nils has started) as well as prepare for videos from the upcoming Linux-Audio-Conference. linuxaudio.org services will be offline for 5-10 mins later today (around 45 min from now). 26/Sept - 16:00 UTC thanks for your understanding. robin

12 years, 2 months

[Ann] Folve: Fuse file system that convolves flac files on-the-fly

by Henner Zeller

Hi, Over the week or so, I've build some fuse filesystem filters flac files on-the-fly using the zita convolver. This makes it real easy to play around with files and filters. In particular with systems that otherwise don't support stream convolving, but just can read files. This is in its early stages, but should be already pretty usable. To see what is going on, it includes a little webserver that gives a status page of what files are currently being accessed. (from the README:) This fuse filesystem takes an original path to a directory with flac-files and provides these files at the mount point. Accessing audio files will automatically convolve these on-the-fly using the zita convolver by Fons Adriaensen. You can directly use filter configuration files that you have for jconvolver/fconvolver. https://github.com/hzeller/folve So if this is something you're interested in, check it out, provide feedback patches :) -henner

12 years, 2 months

LCA2013 - Multimedia and Music miniconf call for papers

by Jeremy Jongepier

We are pleased to announce that linux.conf.au 2013 (LCA2013) will once again include the Multimedia and Music miniconf. LCA2013 will be held in Canberra, Australia from 28 January to 2 February 2013, and the Multimedia and Music miniconf provides an opportunity for produces and consumers of multimedia and music content to meet and explore all aspects of production and playback of music, audio and video on open-source platforms. The Multimedia and Music miniconf call for papers is now open. We would love to see wide-ranging proposals from across the FOSS multimedia and music community: - from developers of open-source multimedia and music software, discussing new and upcoming features, clever solutions to problems or interesting ideas they are exploring - from users who have built up a workflow which they want to share - from anyone who is doing awesome things with open-source audio and video software that they want to tell the world about Presentation slots of 20 and 50 minutes (plus 5 minutes question time) will be available, with the number of 50 minute talks being determined by the number of proposals received. Past Multimedia and Music miniconfs have featured both user-focused tutorials and talks aimed at developers; please browse our past miniconf websites to see the diverse range of presentations we have had in the past: * http://www.annodex.org/events/lca2013_mmm/#previous To submit a proposal please email your proposal to one of the organisers as described on our "Call for papers" page at: http://www.annodex.org/events/lca2013_mmm/pmwiki.php/Main/CallForPapers The call for papers is open-ended but priority will be given to those who submit proposals prior to 30 October 2012. For more information about the Multimedia and Music miniconf please contact either Jonathan Woithe (jwoithe(a)atrad.com.au) or Silvia Pfeiffer (silviapfeiffer1(a)gmail.com).

12 years, 2 months

FFADO 2.1.0 released

by Jeremy Jongepier

The FFADO project is pleased to announce the long-awaited version 2.1.0. With improved stability, many bugfixes and a large number of newly supported devices this version represents 2 years work by the small but dedicated FFADO team. All users of FFADO are encouraged to upgrade. This source-only release can be downloaded from http://www.ffado.org/files/libffado-2.1.0.tgz FFADO is brought to you thanks to the work of Daniel Wagner, Pieter Palmers, Philippe Carriere, Adrian Knoth, Arnold Krille, Jonathan Woithe and the many people who have tested FFADO against their devices, provided patches and given suggestions. Changes and additions in FFADO 2.1: * Significantly improved support for the new "juju" firewire stack found in newer kernels * Support for JACK freewheeling mode and set-buffer-size operation * Lower CPU usage * udev rules included in FFADO to give user access to audio device files * More stable streaming * Fix crash when realtime system clock was set * Fix race conditions and invalid memory accesses on shutdown * Fixes for clean compilation on recent gcc versions (up to 4.7) * ffado-diag enhanced to aid debugging efforts * Many bugs fixed New DICE-based devices supported in FFADO 2.1 (up to 96 kHz rate only): * Alesis (no mixer support): io|14 io|26 Multimix16 Firewire * FlexRadio Systems (no mixer support): Flex-5000 * Focusrite: Saffire PRO 40 (44.1 kHz, 48 kHz and 88.2 kHz only) Saffire PRO 24 Saffire PRO 24 DSP (audio streaming and mixer only: no DSP) Saffire PRO 14 (no mixer or router control) Liquid Saffire 56 (experimental: 44.1/48 kHz only, no mixer/router) * Lexicon (generic mixer): I-ONIX_FW810S * DnR (no mixer): Axum Firewire IO card 16x16 * M-Audio (basic audio with generic mixer): ProFire 2626 ProFire 610 * Presonus: Firestudio Project (generic mixer) Firestudio Tube (generic mixer) Firestudio Mobile (no mixer) Studiolive_1642 (no mixer) Studiolive_2442 (no mixer) * TCAT (audio only): DiceII EVM (1) DiceII EVM (2) DiceII EVM (4) * TC Electronic: Konnekt 24D (no mixer support) Konnekt 8 (no mixer support) Studio Konnekt 48 (no mixer support) Konnekt Live (no mixer support) Desktop Konnekt 6 (no mixer support) ImpactTwin (generic mixer only) * Weiss Engineering Ltd. (no mixer support): ADC 2 Vesta Minerva AFI 1 TAG DAC1 INT 202 DAC 202 Other new devices supported by FFADO 2.1: * RME (no MIDI I/O support yet) Fireface 400 Fireface 800 * MOTU 896 mk 3 (audio only, no mixer yet) Traveller mk 3 (experimental) Ultralite mk 3 (experimental) Ultralite hybrid (firewire only, experimental) * FCA-202, and possibly other Oxford FW-92x devices * Mackie Onyx i * M-Audio Ozonic (no mixer) * Phonic HelixBoard 24 Universal (no mixer) * Tascam IF-FW/DM (experimental, incomplete) * Yahama GO46

12 years, 2 months

Projucer - real-time interactive coding with the JUCE library

by Kaspar Bumke

Just spotted on YouTube: http://youtu.be/imkVkRg-geI For those that don't know, JUCE is a monolithic C++ library that helps you write cross-platform audio applications. I am a bit concerned by the time it seems to be taking to do JIT compilation. What do you think? Would you use it? More details and discussion here: http://rawmaterialsoftware.com/viewtopic.php?f=12&t=9793

12 years, 2 months

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Linux-audio-dev September 2012