Linux-audio-dev July 2012

linux-audio-dev@lists.linuxaudio.org

40 participants
33 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

12 years, 1 month

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, 9 months

LV2 Achievement of GMPI Requirements

by David Robillard

I have adapted the GMPI requirements final draft document to a comparison with the current state of LV2: http://lv2plug.in/gmpi.html A couple of nonsense baroque ideas aside, most of the requirements are met, though there are still important gaps. I mention it here in case anyone has an interest, please feel free to address any of the points made in this document. It may also be useful to augment this document with additional requirements, particularly since there's several knowledgeable folks who may not grok the *how* of LV2 but know *what* they need in terms of general requirements. I will add a section for this if anybody has any input. Perhaps this will serve as a good road map that is not too bogged down with details. Cheers, -dr

12 years, 11 months

The Influence of the Actor Model (Praxis architecture 101)

by Neil C Smith

Hi All, I know I've posted an announcement about Praxis / Praxis LIVE here before. Thought a few people might be interested in this blog entry about Praxis' underlying architecture and the influence of the Actor Model. Be really interested in any comments with thoughts, insights, corrections, stupid mistakes, similar models in use elsewhere, etc., etc. http://praxisintermedia.wordpress.com/2012/07/26/the-influence-of-the-actor… Thanks in advance. Best wishes, Neil -- Neil C Smith Artist : Technologist : Adviser http://neilcsmith.net Praxis - open-source intermedia system for live creative play - http://code.google.com/p/praxis OpenEye - specialist web solutions for the cultural, education, charitable and local government sectors - http://openeye.info

12 years, 11 months

Re: [LAD] [LAU] [ann] out now petri-foo 0.1.85

by rosea.grammostola

On 07/30/2012 03:12 AM, James Morris wrote: > (1.0) Non Session Management support Nice to see a dev who's taking this up. Session management a 'must have' for jack standalone applications and imho NSM is the best option for this. Best regards, \r

12 years, 11 months

[ann] out now petri-foo 0.1.85

by James Morris

Petri-Foo, the fork of the soft-sampler known as Specimen, has a new release, 0.1.85, available: http://sourceforge.net/projects/petri-foo/files/Source/petri-foo-0.1.85.tar… This new release brings two and a half new features with it: (1.0) Non Session Management support (2.0) 'Full Save' functionality (2.5) Import (1.0) NSM support can only be built if the system has liblo installed. If liblo (the lightweight OSC implementation) is _not_ installed petri-foo will be built _without_ NSM support. (2.0) "Full Save" functionality increases the portability of Petri-Foo's 'dish files'. A dir is created (the bank dir) containing the dish file along with symlinks to external samples used. the bank dir can then be archived using `tar -h`. To use full save, just select 'full save as' instead of 'save as' from the file menu. Selecting 'save' will do the right thing after doing so. (2.5) The import function is very self explanatory: it loads a dish file without deleting the existing patches. http://sourceforge.net/projects/petri-foo/files/Source/petri-foo-0.1.85.tar… Further resources: http://petri-foo.sourceforge.net https://sourceforge.net/tracker/?group_id=404816 http://lists.sourceforge.net/lists/listinfo/petri-foo-devel http://github.com/jwm-art-net/Petri-Foo Cheers, James.

12 years, 11 months

Praxis LIVE screencasts / good screencast software for audio?

by Neil C Smith

Hi All, Firstly, finally got around to some screencasts of Praxis LIVE in action - http://praxisintermedia.wordpress.com/2012/07/30/video-rough-cuts-1/ These are just 'rough cuts', unedited except titles and no voiceover. Only first 2 have audio, and the audio on the second is a little off in places (see below!) Secondly, anyone got a suggestion for screencast software that's good at glitch free audio? These are done with Kazam. First is mostly OK, but the second is a little glitchy. Finding only about 1 in 4 captures is any good - all sorts of weird glitches and sometimes speed issues, though the audio playback while recording is fine. Thanks and best wishes, Neil -- Neil C Smith Artist : Technologist : Adviser http://neilcsmith.net Praxis - open-source intermedia system for live creative play - http://code.google.com/p/praxis OpenEye - specialist web solutions for the cultural, education, charitable and local government sectors - http://openeye.info

12 years, 11 months

[Android|OT?] CamSynth - Just an experiment

by Florian Paul Schmidt

Hi, I don't know if this is on-topic or off-topic - technically it runs on a linux, but then, maybe, just, no, no Android on LAD?? :D But anyways: I played a little with Android Development and hacked up a little experimental Synthesizer app. https://github.com/fps/android_camsynth https://play.google.com/store/apps/details?id=io.fps.camsynth It's free and open source and renders 8 voices (on my LG-P500) with a trivial (and wrong :D) synthesis method where the voice gains are determined by the camera image at a 8 x 8 px resolution.. I guess it's somewhat a minimal project which can be instructive to some (the synthesis part is implemented in C via JNI). And the code is very small.. Have fun, Flo

12 years, 11 months

The guitarix project release version 0.23.3

by hermann meyer

We are proud to announce the release of guitarix2-0.23.3. Guitarix is a modular tube amplifier simulation for jack, with additional Effect-Racks, inbuilt effects as well as support for LADSPA plug-ins. This is a Bug-fix release witch fix the ladspa_guitarix.so module guitarix-fx [UniqueID 4070] to avoid segfault when loading into a host. Please refer to our project page for more information: http://guitarix.sourceforge.net/ download site: http://sourceforge.net/projects/guitarix/ have fun guitarix development team

12 years, 11 months

Leslie and convolution

by Julien Claassen

Hello everyone! I have just asked myself, if it is a good idea to use an IR of a Leslie for simulating a Leslie. Correct me, if I'm bloody stupid, but working on the basics of convolution, it doesn't look promising. Since you take the IR of the Leslie and then apply the full IR to each sample, meaning, that you might get more of a whirling reverb? Or is there another technique, to apply an IR and cycles. Just one "sample" of the IR to one sample of the input signal. If I am completely wrong, a simple no will suffice. My knowledge of this is basic. I've only got some knowledge from a lecture called "signal theory' to back me up and it should probably be called "an introduction to" or "basics of" at that. :-) Warm regards Julien =-=-=-=-=-=-=-=-=-=-=-=- Such Is Life: Very Intensely Adorable; Free And Jubilating Amazement Revels, Dancing On - FLOWERS! ====== Find my music at ====== http://juliencoder.de/nama/music.html ..................................... "If you live to be 100, I hope I live to be 100 minus 1 day, so I never have to live without you." (Winnie the Pooh)

12 years, 11 months

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Linux-audio-dev July 2012