Linux-audio-dev November 2012

linux-audio-dev@lists.linuxaudio.org

40 participants
30 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, 7 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, 11 months

CAPS* as LV2

by Aurélien Leblond

Hi all, Quick question: does the CAPS* plugins suite exist in LV2 format (I'm almost sure the answer is no, as I have looked everywhere, but you never know...). If not, could somebody who knows the code of these plugins let me know how hard it would be to port them to LV2? Are there any pitfalls to look for? Background: a few years back, I created a few synths using AlsaModularSynth - I'm trying to recreate them into Ingen. I already ported the AMS internal modules to lv2 (avw.lv2), and a few other ones that I need are now in fomp.lv2. I use the CAPS amp modelling to make the sound of the synth a bit more natural. Obviously, I know I could plug Ingen output into JackRack for example and use CAPS there for example, but where is the fun in that? :) Incidentally, are there other LV2 plugins that would do at Amp Modelling? Aurélien

12 years

Re: [LAD] CAPS* as LV2

by Aurélien Leblond

> I don't know about the caps plugins, however, i had a question on > avw.lv2. I installed those plugin's to work through a tutorial on > synth building in ingen (you may have done the tutorial). That works > fine in ingen. However, if i have that lv2 plugin set installed, > qtractor will not start for me.. if i uninstall the set, qtractor > starts fine. have you seen this behavior? Qtractor doesnt segment > fault or anything.. it just hangs. I tried with both 0.5.6 and current > svn head. > > Have you seen this? No I haven't seen this behaviour, but I haven't been using QTractor that much. What repository did you use for the plugins, LV2 and QTractor?

12 years

Re: [LAD] Optimized device driver to Fast Track Pro (start developing)

by Guillaume Pellerin

On 23/11/2012 20:01, rodrigo(a)angoera.com.br wrote: > > Hi !!!!! > > The Fast Track Pro is USB 1.0, the max bandwidth is 12Mb/s. The TUSB3200 has > the isochronous USB transfer mode, that can occupy about 90% of the USB > bandwidth... Using 4 channel (2 IN and 2 OUT) with right and left, and 24 bits > (3 bytes each, in total 4(channel) * 2(left,right) * 3(data) = 24 bytes ) The > max bandwidth that could communicate is about 12Mbits/s = 1.5 Mbytes/s | 1.5 > Mbytes/s * 0.9 = 1.2 MBytes/s --> 1.2MBytes/s / 24 bytes = 50Khz ... So the > maximum USB 1.0 with 24 bits is 4 chanel in 48KHz... > You're absolutely right, the 24 bits 4 channels mode would be only accessible in 48 kHz samplerate. > I would like to know how it works the interface between USB AUDIO CLASS device > driver and the USB-AUDIO Alsa Device driver. And how does the isochronous > comunication works inside the kernel? Because I am using an RT Kernel and I > would like to set with the high priority this communication. > I don't really know how does the isochronous, but applying usual RT security audio rules seems sufficient to get high priority access and then very low latency (got 3 ms here with few audio realtime processes..). Further info here: http://joegiampaoli.blogspot.fr/2011/06/m-audio-fast-track-pro-for-debian-l… G

12 years

eigenlabs + linux

by Alexandre Prokoudine

Hi, Is anybody interested to help Eigenlabs figure out the USB layer to get their stuff ported to Linux? http://www.eigenlabs.com/forum/threads/id/1148/ They are very free software friendly. Their code is available under GPL, they have a very good understanding of working with community while staying an enterprise (the instruments are not open, as far as I can tell), and, needless to say, the instruments they do are beyond awesome. Alexandre Prokoudine http://libregraphicsworld.org

12 years

Re: [LAD] VSTGUI porting in Linux

by Louis Gorenfeld

>> Hello Louis, >> >> You might want to contact Filipe Coelho (aka falktx). >> >> http://forum.linuxmusicians.**com/viewtopic.php?f=47&t=10231<http://forum.linuxmusicians.com/viewtopic.php?f=47&t=10231> >> >> Regards, >> >> Jeremy >> > >I have some experimental code for VST UIs in Linux (using openGL), it's not >ready for release... >I've uploaded a source tarball with a plugin inside, although the UI seems >to have some little issues right now: >http://kxstudio.sourceforge.net/tmp/3BandEQ-VstTest1.tar.gz > >I'll work more on it soon, so for now it can be a "preview" of how it is >done. >But in short, it uses something I call "DISTRHO Plugin Toolkit", which >similar to Juce can make a single source code compile into different plugin >APIs (At the moment LADSPA, DSSI, LV2, VST and Standalone, some better than >others). >This plugin uses openGL for the UI, but Qt4 can be used alternatively. DISTRHO looks interesting, but I was wondering maybe if my existing VSTGUI code could somehow be used with the least amount of adjustments. I guess since it's just a bunch of x,y offsets and basic widgets it shouldn't be too hard to port to another toolkit, but I don't have the free time I used to. But, I'll definitely consider it. It's free, right? I didn't see a license so I'm guessing it'd be ok to bake into my binary-only application (apologies if I just missed it). I'm wondering if maybe downgrading VSTGUI and making the plugin perfectly WINE-friendly (or winelib) would be an option. Anyone know what the best VSTGUI version might be the best target for that? And any opinions on the VSTGUI port found at jacklab.net? -Louis

12 years

Optimized device driver to Fast Track Pro (start developing)

by rodrigo＠angoera.com.br

Hi every body, I would like to develop an very optimized device driver for the USB soundcard, I am going to use the IC TUSB3200 similar the Fast Track Pro from M-Audio (I would like to optimize this device driver as well) , I am a hardware developer, and now I gonna start in the Linux world... I would like to know if someone could tell me what the better path to learn and develop an USB sound card???

12 years

[ANN] Vee One Suite 0.2.0 - The second public release

by Rui Nuno Capela

Greetings, The new gang-of-three's now barely consolidated into one semi-official 'Vee One Suite'. Of course, as time goes by, inexorably, the still self-described 'old-school', 'proto-toys', just become a little older and mature by the day. Eventually, they will rot. But not today. Same old features, still the norm: * a pure stand-alone JACK client with JACK-session and both JACK MIDI and ALSA MIDI input support; * a LV2 instrument plugin. Here follows the news from the change-log, common to all synthv1, samplv1 and drumkv1, unless specifically stated otherwise: - New Reset (all values to preset default) button. - New parameter A / B comparison toggle buttons. - New element exclusive Group sounding setting. (drumkv1) - New Velocity sensitivity configuration control. - Increased baseline polyphony from 24 to 32 voices. - Mouse-wheel support on combo-dial knob widgets. - New command line options: --help and --version information. (stand-alone JACK client forms only) - Voice re-triggering fast-release fix. - LV2 event buffer recycle fix. - Prepared for relative filesystem paths on preset file references. - Audio sample file browser support for old 8.3 file-name formats. (samplv1, drumkv1) - Audio sample waveform widget context menu added. (samplv1) And here are the (old-school) buddies: * synthv1 - an old-school polyphonic synthesizer synthv1 is an old-school all-digital 4-oscillator subtractive polyphonic synthesizer with stereo fx. LV2 URI: http://synthv1.sourceforge.net/lv2 website: http://synthv1.sourceforge.net downloads: http://sourceforge.net/projects/synthv1/files - source tarball: http://download.sourceforge.net/synthv1/synthv1-0.2.0.tar.gz - source package: http://download.sourceforge.net/synthv1/synthv1-0.2.0-6.rncbc.suse122.src.r… - binary packages: http://download.sourceforge.net/synthv1/synthv1-0.2.0-6.rncbc.suse122.i586.… http://download.sourceforge.net/synthv1/synthv1-0.2.0-6.rncbc.suse122.x86_8… * samplv1 - an old-school polyphonic sampler samplv1 is an(other) old-school all-digital polyphonic sampler synthesizer with stereo fx. LV2 URI: http://samplv1.sourceforge.net/lv2 website: http://samplv1.sourceforge.net downloads: http://sourceforge.net/projects/samplv1/files - source tarball: http://download.sourceforge.net/samplv1/samplv1-0.2.0.tar.gz - source package: http://download.sourceforge.net/samplv1/samplv1-0.2.0-6.rncbc.suse122.src.r… - binary packages: http://download.sourceforge.net/samplv1/samplv1-0.2.0-6.rncbc.suse122.i586.… http://download.sourceforge.net/samplv1/samplv1-0.2.0-6.rncbc.suse122.x86_8… * drumkv1 - an old-school drum-kit sampler. drumkv1 is (yet) an(other) s an old-school all-digital drum-kit sampler synthesizer with stereo fx. LV2 URI: http://drumkv1.sourceforge.net website: http://drumkv1.sourceforge.net downloads: http://sourceforge.net/projects/drumkv1/files - source tarball: http://download.sourceforge.net/drumkv1/drumkv1-0.2.0.tar.gz - source package: http://download.sourceforge.net/drumkv1/drumkv1-0.2.0-2.rncbc.suse122.src.r… - binary packages: http://download.sourceforge.net/drumkv1/drumkv1-0.2.0-2.rncbc.suse122.i586.… http://download.sourceforge.net/drumkv1/drumkv1-0.2.0-2.rncbc.suse122.x86_8… see also: http:/www.rncbc.org/drupal/node/580 enjoy! -- rncbc aka Rui Nuno Capela rncbc(a)rncbc.org

12 years

CAPS Tonestack tone strange behavior

by Lucas Takejame

Hi everyone, I was using CAPS AmpVTS and notice that some tone knobs didn't work well. I end up trying tonestack plugin itself and it seems that the problem (is this a bug or its the way it really works?) is there, the Bass filter apparently stops working about 0.5 to 1.0 , the Mid filter, on the other way, apparently starts working in this zone, Treble seems to work fine. Has anyone noticed something like that or even corrected this problem? Att, Lucas Takejame

12 years

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Linux-audio-dev November 2012