Linux-audio-dev February 2012

linux-audio-dev@lists.linuxaudio.org

61 participants
35 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, 8 months

Faust MIDI?

by Carlo Capocasa

Hi, is it possible to send and receive MIDI with a FAUST program? Carlo

12 years, 8 months

AMS LV2 plugins: Version 0.0.6

by Aurélien Leblond

Hello everyone, During this jolly holidays, I worked a bit on the AMS LV2 plugins. The version 0.0.6 can be downloaded here: http://sourceforge.net/projects/avwlv2/files/avw.lv2.0.0.6.tar.gz/download This new version comes with: * Basic GUI for Analog Driver, Envelop and Advanced Envelop * Ported: - CV Source - Delay - Dynamic Waves (4 Osc) The basic GUIs are based on the ones from AMS itself. In addition, the SVN is now fixed: svn checkout svn://svn.code.sf.net/p/avwlv2/code/trunk avwlv2-code Finally, plans for the future are to port more of the AMS plugins (I'm sorry guys, but I'm only gonna port the ones I actually use and might ignore some others). I was thinking as well to: - create a percussive envelop and 'Note Filter' (a plugin that let the Velocity/Gate/Trigger of the Ingen Note Internal go through only when a certain Frequency is hit). I have patches that simulate the TR 808 Kick/Snare/Etc, and I need these to be able to create a Drum Machine in Ingen. - create a beat slicer/repeater plugin (probably will base the code on Tranches). - a LFO synchcronized with Jack (I have always missed that one AMS!). So here you go! Have a happy new year 2012 guys! Aurélien

12 years, 9 months

Tutorial for programming with JACK

by Kris Calabio

I want to learn how to program with JACK. I found this tutorial: http://dis-dot-dat.net/index.cgi?item=/jacktuts/starting/ linked from this page ( http://jackaudio.org/documentation ). I noticed that the tutorial has some broken links. Is this still a good resource to learn from? Or are there any better ones out there? Any suggestions will be much appreciated. Thanks, Kris

12 years, 10 months

Re: [LAD] audio on Raspberry PI

by Victor Lazzarini

Thanks, sounds good, I am thinking here: cheap synthesizer. Victor On 29 Feb 2012, at 10:40, James Harrison wrote: > Comes with a DAC, but no ADC as far as I can see. > > Cheers, > James Harrison > > > On 29/02/2012 10:30, Victor Lazzarini wrote: >> Does anyone know whether the Raspberry PI comes with a DAC/ADC? >> >> Dr Victor Lazzarini >> Senior Lecturer >> Dept. of Music >> NUI Maynooth Ireland >> tel.: +353 1 708 3545 >> Victor dot Lazzarini AT nuim dot ie >> >> >> >> _______________________________________________ >> Linux-audio-dev mailing list >> Linux-audio-dev(a)lists.linuxaudio.org >> http://lists.linuxaudio.org/listinfo/linux-audio-dev Dr Victor Lazzarini Senior Lecturer Dept. of Music NUI Maynooth Ireland tel.: +353 1 708 3545 Victor dot Lazzarini AT nuim dot ie

12 years, 10 months

memory allocation for the real time thread, opinions wanted

by Iain Duncan

Hi everyone, hoping to get opinions from gurus on here, who have been *incredibly* helpful in getting my project to where its at. A million thank yous! Ok, the situation so far, which is working well: - the app uses a generalized 'message' structure, all the different forms of messages fit into this structure by having it act alike a union. ( ie, a message always takes up the same amount of space, no matter the type ) - messages do not container pointers, in order that they be simple to send and receive over network clients, hardware, etc - there are ringbuffers between my audio thread and real time thread What I'm tackling: - I want to add the capability for messages to have deferred execution, so they can be sent with a 'process at 4:3:1' kind of thing - I think the best tradeoff for my app so far will be to use a hybrid of a timeline array and a linked list. there will be coarse time values stored by raw array indexing, speeding up lookup, and fine time values will be stored in the messages themselves - so, when the engine is processing deferred messages, it will go and check timelineArray for all messages at bar 1:beat 1, which will be a linked list of all the messages with start time between bar:1 beat 1 and bar 1: beat 2 ( time resolution may change, this just for example - then the engine iterates on every tick through that list of messages. This way, iteration on every tick is limited to a reasonable sized linked list and I can play with the cpu vs data storage equation by simply changing the resolution of the time line array Issues: - I need to allocate memory for new linked list items in the realtime thread - the timeline array needs to be able to grow in the real time thread Thoughts: - I don't need to get it perfect *right now* but I need to be able to change it to Really Good later - I checked out some resources, like this one the Design Patterns for *Real* -*Time* Computer *Music* Systems<http://www.google.ca/url?sa=t&rct=j&q=audio%20allocating%20memory%20in%20re…> and the supercollider book chapter and see there are a lot of options - I could pre-allocate a giant list of messages and pluck the data off that list when I need to make a new one - I could pre-allocate a block of memory and allocate off that - I could allocate in the non-realtime thread and then pass memory over in queues. Would love to hear opinions on how others would solve these, including tradeoffs of each. thanks! iain

12 years, 10 months

Music made with Linux: Airship - A 16bit Soundtrack Theme

by Nils

Hello list, I would like to share a piece I've just finished. The original blog entry is here, but for your convenience I'll include a copy into this mail. Feel free to use any channel you want if you would like to comment on it. http://www.nilsgey.de/2012/02/29/airship-theme/ Airship - A 16bit Soundtrack Theme direct download: http://www.nilsgey.de/uploads/NilsGey-AirshipTheme.mp3 I have finished my first just-for-fun composition since a very long time ago. It is a game-soundtrack like piece I named “Airship”. I can imagine this in a Japanese 90’s RPG from the SNES or Sega Genesis/MegaDrive era. Software used: Laborejo composition and midi generation, Fluidsynth for midi to wave rendering and Ardour for the fadeout :) . I used an .sf2 called Setzers SPC which I have downloaded here. I am not sure about the soundfonts legal status so I am careful and release the Airship Theme not as a free piece but just as: Listen to it freely, share and redistribute it but don’t use it in any work, derived or original, or as part of a game or video etc. Don’t do anything commercial with it and don’t change the mp3 tags. If you find a named, matching License to this description feel free to use that instead. I would be very happy if you leave a comment or click this blogs “Like” button. Greetings, Nils http://www.nilsgey.de http://www.laborejo.org

12 years, 10 months

Re: [LAD] audio on Raspberry PI

by Victor Lazzarini

If there is Linux and Alsa, we should just be able to cross-compile (or even compile on the Raspberry if there is gcc); I don't see many difficulties. It should be easier than android and iOS. I might see if I can get one to run Csound on. Regards Victor On 29 Feb 2012, at 10:46, James Harrison wrote: > I'm hoping that adding an ADC won't be too tricky, though it has USB so a USB sound card should work. For $25 an end, it'd make a lovely portable IP codec for broadcast with CELT and RTP... > > Cheap synth would be neat, though. Wonder how much stuff in the Linux audio world is ARM-compatible? > > Cheers, > James Harrison > > > On 29/02/2012 10:45, Victor Lazzarini wrote: >> Thanks, sounds good, I am thinking here: cheap synthesizer. >> >> Victor >> On 29 Feb 2012, at 10:40, James Harrison wrote: >> >>> Comes with a DAC, but no ADC as far as I can see. >>> >>> Cheers, >>> James Harrison >>> >>> >>> On 29/02/2012 10:30, Victor Lazzarini wrote: >>>> Does anyone know whether the Raspberry PI comes with a DAC/ADC? >>>> >>>> Dr Victor Lazzarini >>>> Senior Lecturer >>>> Dept. of Music >>>> NUI Maynooth Ireland >>>> tel.: +353 1 708 3545 >>>> Victor dot Lazzarini AT nuim dot ie >>>> >>>> >>>> >>>> _______________________________________________ >>>> Linux-audio-dev mailing list >>>> Linux-audio-dev(a)lists.linuxaudio.org >>>> http://lists.linuxaudio.org/listinfo/linux-audio-dev >> Dr Victor Lazzarini >> Senior Lecturer >> Dept. of Music >> NUI Maynooth Ireland >> tel.: +353 1 708 3545 >> Victor dot Lazzarini AT nuim dot ie >> >> >> >> _______________________________________________ >> Linux-audio-dev mailing list >> Linux-audio-dev(a)lists.linuxaudio.org >> http://lists.linuxaudio.org/listinfo/linux-audio-dev Dr Victor Lazzarini Senior Lecturer Dept. of Music NUI Maynooth Ireland tel.: +353 1 708 3545 Victor dot Lazzarini AT nuim dot ie

12 years, 10 months

audio on Raspberry PI

by Victor Lazzarini

Does anyone know whether the Raspberry PI comes with a DAC/ADC? Dr Victor Lazzarini Senior Lecturer Dept. of Music NUI Maynooth Ireland tel.: +353 1 708 3545 Victor dot Lazzarini AT nuim dot ie

12 years, 10 months

Ardour 3 : How to link automation to region ?

by Fons Adriaensen

See subject - I've been unable to find out ... TIA, -- FA Vor uns liegt ein weites Tal, die Sonne scheint - ein Glitzerstrahl.

12 years, 11 months

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Linux-audio-dev February 2012