Linux-audio-dev

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3 participants
7535 discussions

[LAD] DSSI, OSC and Ladspa UUID vs MIDI channel

by Joël Krähemann

Hi all Could someone explain me why the MIDI channel is used to identify DSSI instances? You could use the URL instead. Bests, Joël

9 years, 8 months

[LAD] Advanced Gtk+ Sequencer v0.7.20

by Joël Krähemann

Hi all libags_audio-1.0 is here and is provided by GSequencer v0.7.20. http://gsequencer.org/gsequencer/announcements/2016/05/26/libags-1_0.html cheers, Joël Krähemann

9 years, 8 months

[LAD] student job linux C (driver) development

by Giso Grimm

Hi, we have an open position for a student assistant for linux audio driver development in our group "digital hearing devices" at the university of Oldenburg, Germany: http://www.careerservice.uni-oldenburg.de/admin/public/_jobboerse/jobs/1907… Unfortunately this document is in German only, therefore please find a google translation below. German language skills are not required, and remote collaboration could be possible. Best regards, Giso Student assistant for programming Linux audio driver searched To connect a multi-channel sound card ( development of the Uni Hannover ) on the processor board BEAGLEBONE black with Linux Operating system using standard libraries examined the AG Auditory signal processing a student assistant ( with or without bachelor's degree , but without master's degree ) . The scope is initially 120h (3 months a 40h / month). Candidate / candidates should programming skills in C and bring knowledge of Linux . Previous experience with Linux Kernel development is helpful but not required. If interested, please contact Prof. Dr. V. Hohmann (volker.hohmann(a)uni-oldenburg.de).

9 years, 8 months

Re: [LAD] mixing while using libao and libsndfile

by Andrea Del Signore

> I've been knocking my head against a wall for more than a year trying to > figure out how to correctly mix two streams of audio while using > libsndfile for input and libao for output. My main requirement is that > I cannot assume anything about the output drivers -- that is, I cannot > depend on the output driver (ALSA, OSS, Sun, etc) being able to do the > mixing for me. Many of my target platforms lack any sort of mixing > services. I need to do this myself. I tried starting a mixer/player > thread that would work in a producer/consumer relationship with one or > two audio file decoder threads. I can play one sound at a time just > fine. When I try to do both, I get distortion followed by a segfault. Hi, not sure if I understood correctly: do you just want to mix N files? Like you I'm learning libsndfile and libao so this is my attempt to mix some audio files: http://pastebin.com/dm7z8b3Z HTH, Andrea P.S. Can someone explain line 88 (I already read the sndfile FAQ)? On Mon, May 16, 2016 at 11:30 PM, < linux-audio-dev-owner(a)lists.linuxaudio.org> wrote: > You are not allowed to post to this mailing list, and your message has > been automatically rejected. If you think that your messages are > being rejected in error, contact the mailing list owner at > linux-audio-dev-owner(a)lists.linuxaudio.org. > > > > ---------- Forwarded message ---------- > From: Andrea Del Signore <sejerpz(a)gmail.com> > To: linux-audio-dev(a)lists.linuxaudio.org > Cc: > Date: Mon, 16 May 2016 21:26:40 +0000 (UTC) > Subject: Re: [LAD] mixing while using libao and libsndfile > On Sun, 15 May 2016 16:34:34 +0000, David Griffith wrote: > > > I've been knocking my head against a wall for more than a year trying to > > figure out how to correctly mix two streams of audio while using > > libsndfile for input and libao for output. My main requirement is that > > I cannot assume anything about the output drivers -- that is, I cannot > > depend on the output driver (ALSA, OSS, Sun, etc) being able to do the > > mixing for me. Many of my target platforms lack any sort of mixing > > services. I need to do this myself. I tried starting a mixer/player > > thread that would work in a producer/consumer relationship with one or > > two audio file decoder threads. I can play one sound at a time just > > fine. When I try to do both, I get distortion followed by a segfault. > > > > So, I'm back to a demo program. What must I do to this program to cause > > it to start playing one audio file, then play another N seconds later? > > > > David Griffith dave(a)661.org > > > > Hi, > > not sure if I understood correctly: do you just want to mix N files? > > I'm a noob with both libsndfile and libao :) > > Here my code: http://pastebin.com/dm7z8b3Z > > HTH, > Andrea > > P.S. > Can someone explain line 88 (I already read the sndfile FAQ)? > > >

9 years, 9 months

[LAD] mixing while using libao and libsndfile

by David Griffith

I've been knocking my head against a wall for more than a year trying to figure out how to correctly mix two streams of audio while using libsndfile for input and libao for output. My main requirement is that I cannot assume anything about the output drivers -- that is, I cannot depend on the output driver (ALSA, OSS, Sun, etc) being able to do the mixing for me. Many of my target platforms lack any sort of mixing services. I need to do this myself. I tried starting a mixer/player thread that would work in a producer/consumer relationship with one or two audio file decoder threads. I can play one sound at a time just fine. When I try to do both, I get distortion followed by a segfault. So, I'm back to a demo program. What must I do to this program to cause it to start playing one audio file, then play another N seconds later? David Griffith dave(a)661.org ===begin code=== /* * gcc -o mixer mixer.c -lao -lsndfile * */ #include <stdio.h> #include <stdlib.h> #include <stdint.h> #include <string.h> #include <ao/ao.h> #include <sndfile.h> #define BUFFSIZE 512 int playfile(FILE *); int main(int argc, char *argv[]) { FILE *fp1, *fp2; if (argc < 2) { printf("usage: %s <filename>.ogg <filename>.aiff\n", argv[0]); exit(1); } fp1 = fopen(argv[1], "rb"); if (fp1 == NULL) { printf("Cannot open %s.\n", argv[1]); exit(2); } fp2 = fopen(argv[1], "rb"); if (fp2 == NULL) { printf("Cannot open %s.\n", argv[1]); exit(3); } ao_initialize(); playfile(fp1); playfile(fp2); ao_shutdown(); return 0; } int playfile(FILE *fp) { int default_driver; ao_device *device; ao_sample_format format; SNDFILE *sndfile; SF_INFO sf_info; short *shortbuffer; int64_t toread; int64_t frames_read; int64_t count; sndfile = sf_open_fd(fileno(fp), SFM_READ, &sf_info, 1); memset(&format, 0, sizeof(ao_sample_format)); shortbuffer = malloc(BUFFSIZE * sf_info.channels * sizeof(short)); frames_read = 0; toread = sf_info.frames * sf_info.channels; count = 0; default_driver = ao_default_driver_id(); memset(&format, 0, sizeof(ao_sample_format)); format.byte_format = AO_FMT_NATIVE; format.bits = 16; format.channels = sf_info.channels; format.rate = sf_info.samplerate; device = ao_open_live(default_driver, &format, NULL); if (device == NULL) { printf("Error opening sound device.\n"); exit(4); } while (count < toread) { frames_read = sf_read_short(sndfile, shortbuffer, BUFFSIZE); count += frames_read; ao_play(device, (char *)shortbuffer, frames_read * sizeof(short)); } ao_close(device); sf_close(sndfile); } ===end code=== -- David Griffith dave(a)661.org

9 years, 9 months

[LAD] Jack ring buffer (again)

by Will Godfrey

I'm not sure if this has been covered before... While I understand that generally you can't be certain of writing or reading all bytes in a block of data in one call, what about the specific case where you *always* read and write the same number of bytes and the buffer is an exact multiple of this size. e.g data block is 5 bytes & buffer size is 75 bytes. No I'm not intending to use such an example, I just want to cover worst case :) If that doesn't work, what about the case when you are always working in powers of 2? e.g data block is 16 bytes & buffer size is 1024 bytes. -- Will J Godfrey http://www.musically.me.uk Say you have a poem and I have a tune. Exchange them and we can both have a poem, a tune, and a song.

9 years, 9 months

[LAD] [LAU] [LAA] Guitarix 0.35.0 released

by Hermann Meyer

The Guitarix developers proudly present Guitarix release 0.35.0 Guitarix is a tube amplifier simulation for jack (Linux), with an additional mono and a stereo effect rack. Guitarix includes a large list of plugins[*] and support LADSPA / LV2 plugs as well. The guitarix engine is designed for LIVE usage, and feature ultra fast, glitch and click free, preset switching, full Midi and/or remote controllable (Web UI not included in the distributed tar ball). This release introduce the new GUI design by Markus Schmidt aka. boomshop Beside that, it comes with a couple of fixes and some new plugins. Also included be the MOD UI's for the LV2 plugins used by the MOD[*] For all changes, please check out the changelog. Please refer to our project page for more information: http://guitarix.sourceforge.net/ Download Site: http://sourceforge.net/projects/guitarix/ Forum: http://guitarix.sourceforge.net/forum/ Please consider visiting our forum or leaving a message on guitarix-developer(a)lists.sourceforge.net <mailto:guitarix-developer@lists.sourceforge.net> regards hermann [*] http://moddevices.com/

9 years, 9 months

Re: [LAD] [FFADO-devel] [PATCH ffado] tests: fix build error due to wrong errno initialization

by Jonathan Woithe

On Fri, Apr 29, 2016 at 09:08:40AM +0200, Jano Svitok wrote: > I tried to compile ffado trunk now (ubuntu 14.04 trusty) and the > compilation failed with undefined errno. > The attached patch fixed that. Thanks. Patch applied as r2607. > I didn't look why the others work and these two files not. The others either don't reference errno directly or include other headers which apparently pull it in. Regards jonathan

9 years, 9 months

[LAD] After LAC is before LAC

by David Runge

Folks! it has been our pleasure having some of you at c-base the past weekend! It trully was an awesome event. Thank you! Some notes about the event: * all videos here: https://media.ccc.de/c/minilac16 * github association here: https://github.com/linuxaudio * update your information and files for content freeze prior to wiki move before 20160430! http://minilac.linuxaudio.org/ Please watch https://media.ccc.de/v/minilac16-lacisdeadlongliveminilac to get an update on a possible location for next year. The video also serves as explanatory for our proposal of a collective redesign, managed through github. For this to happen, please let me know about your github name, so I can add you! All the best from c-base, David -- David Runge Schreinerstraße 11 10247 Berlin http://sleepmap.de

9 years, 9 months

[LAD] [ANN] Qtractor 0.7.7 - The Haziest Photon is out!

by Rui Nuno Capela

Hi everybody, On the wrap of the late miniLAC2016(a)c-base.org Berlin (April 8-10) [7][8], where this Yet Same Old Qstuff* (continued) workshop [9] babbling of yours truly (slides, videos[10]) was taken place. There's really one (big) thing to keep in mind, as always: Qtractor [1] is not, never was, meant to be a 'do-it-all' monolith DAW. Quite frankly it isn't a 'pure' modular model either. Maybe we can agree on calling it a 'hybrid' perhaps? And still, all this time, it has been just truthful to its original mission statement--modulo some Qt [2] major version numbers--nb. it started on Qt3 (2005-2007), then Qt4 (2008-2014), it is now Qt5 full throttle. It must have been like start saying uh. this is probably the best dot or rather beta release of them all! Now, Qtractor 0.7.7 (haziest photon) is out! Everybody is here compelled to update. Leave no excuses behind. As for the 'mission statement' coined above, you know it's the same as ever was (and it now goes to eleven years in the making [11]): Qtractor [1] is an audio/MIDI multi-track sequencer application written in C++ with the Qt framework [2]. Target platform is Linux, where the Jack Audio Connection Kit (JACK [3]) for audio and the Advanced Linux Sound Architecture (ALSA [4]) for MIDI are the main infrastructures to evolve as a fairly-featured Linux desktop audio workstation GUI, specially dedicated to the personal home-studio. Website: http://qtractor.sourceforge.net Project page: http://sourceforge.net/projects/qtractor Downloads: http://sourceforge.net/projects/qtractor/files - source tarball: http://download.sf.net/qtractor/qtractor-0.7.7.tar.gz - source package: http://download.sf.net/qtractor/qtractor-0.7.7-25.rncbc.suse.src.rpm - binary packages: http://download.sf.net/qtractor/qtractor-0.7.7-25.rncbc.suse.i586.rpm http://download.sf.net/qtractor/qtractor-0.7.7-25.rncbc.suse.x86_84.rpm Git repos: http://git.code.sf.net/p/qtractor/code https://github.com/rncbc/qtractor.git https://gitlab.com/rncbc/qtractor.git https://bitbucket.org/rncbc/qtractor.git Change-log: - LV2 UI Touch feature/interface support added. - MIDI aware plug-ins are now void from multiple or parallel instantiation. - MIDI tracks and buses plug-in chains now honor the number of effective audio channels from the assigned audio output bus; dedicated audio output ports will keep default to the stereo two channels. - Plug-in rescan option has been added to plug-ins selection dialog (yet another suggestion by Frank Neumann, thanks). - Dropped the --enable-qt5 from configure as found redundant given that's the build default anyway (suggestion by Guido Scholz, thanks). - Immediate visual sync has been added to main and MIDI clip editor thumb-views (a request by Frank Neumann, thanks). - Fixed an old MIDI clip editor contents disappearing bug, which manifested when drawing free-hand (ie. Edit/Select Mode/Edit Draw is on) over and behind its start/beginning position (while in the lower view pane). License: Qtractor [1] is free, open-source Linux Audio [5] software, distributed under the terms of the GNU General Public License (GPL [6]) version 2 or later. References: [1] Qtractor - An audio/MIDI multi-track sequencer http://qtractor.sourceforge.net [2] Qt framework, C++ class library and tools for cross-platform application and UI development http://qt.io/ [3] JACK Audio Connection Kit http://jackaudio.org [4] ALSA, Advanced Linux Sound Architecture http://www.alsa-project.org/ [5] Linux Audio consortium of libre software for audio-related work http://linuxaudio.org [6] GPL - GNU General Public License http://www.gnu.org/copyleft/gpl.html [7] miniLAC, a more compact, community-driven version of the yearly Linux Audio Conference http://minilac.linuxaudio.org [8] c-base.org, Berlin http://c-base.org [9] Yet Same Old Qstuff* (continued) workshop http://minilac.linuxaudio.org/index.php/Workshop#Yet_Same_Old_Qstuff.2A_.28… [10] slides: http://minilac.linuxaudio.org/index.php/File:Lac2016_qstuff_slides.pdf videos: http://media.ccc.de/v/minilac16-yetsameoldqstuff [11] Siskel & Ebert - "This Is Spinal Tap" http://www.youtube.com/watch?v=4xgx4k83zzc See also: http://www.rncbc.org/drupal/node/1033 Enjoy && Have fun. -- rncbc aka Rui Nuno Capela

9 years, 9 months

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Linux-audio-dev