Linux-audio-dev

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4 participants
7502 discussions

by Patrick Shirkey

Hi, Moving this to the LAD list as it seems to be getting to a more technical and challenging stage now. This may be a simple answer and if so that is great but suspect it is a bit more complex than that so might require the brain power of the LAD list rather than just my capabilities. To recap I am trying to get hard data on the best case latency while running a combination of JACK + PA. There are various reasons for and against doing this but discussing them is not the purpose of this thread. - I am using jack_delay to measure the round trip latency between jack -> PA -> JACK - I also have been testing a complete loop including system i/o but for the purposes of this thread we can ignore those results. - I have seen some interesting numbers come up today. If I run the following command: pactl list sink-inputs I get numbers similar to this: Buffer Latency: 8000 usec Sink Latency: 3166 usec The combination of the two shows the actual PA Stream Buffer latency (approx 10 - 11ms). This number stays approximately static while polling with this command. To be clear there is also the additional latency that occurs as the data is transferred from PA to the output but I am told it is negligible although it might turn out to be a key player. The results from jack_delay are somewhat different. I have included a snapshot below*. For reference sake it was also suggested that I open /dev/cpu_dma_latency and give it a value of 0. /dev/cpu_dma_latency allows to write the latency you can tolerate (in ms). The kernel will translate this to the deepest C-state the processor can enter. I have been running my tests with this value at zero in case it helps. I have checked with powertop and turbostat but it doesn't appear to make any difference on this machine. Possibly because it is an older cpu. Armed with that preliminary information there are a couple of issues that I am interested in at this juncture. 1: Why PA is reporting 10ms for the stream buffer but jack_delay is giving the results below. 2: Why PA is reporting 10ms for the stream buffer when I am running jack at 64 frames/period and ecasound too. 3: Where the fluctuating measurements from jack_delay are coming from in the graph as PA Stream Buffer is static at 10ms and ecasound is basically in pass through with a 64/48k buffer same as JACK. A back of the envelop estimation suggests latency should be stable well under 20ms including the 10ms set aside for the PA Stream buffer. --------- RESULTS --------- jack_delay -> pa -> ecasound -> pa -> jack_delay hda_intel driver dual core Intel(R) Core(TM)2 CPU T5600 @ 1.83GHz jack is run at 64/48000/2 ecasound has a period size of 64 PA is configured to run at 48khz too [*] Here's the snapshot from jack_delay: 62784.000 frames 1308.000 ms total roundtrip latency extra loopback latency: 62784 frames use 31392 for the backend arguments -I and -O 62784.000 frames 1308.000 ms total roundtrip latency extra loopback latency: 62784 frames use 31392 for the backend arguments -I and -O ?? Inv 63168.000 frames 1316.000 ms total roundtrip latency extra loopback latency: 63168 frames use 31584 for the backend arguments -I and -O 63743.999 frames 1328.000 ms total roundtrip latency extra loopback latency: 63743 frames use 31871 for the backend arguments -I and -O 64639.999 frames 1346.667 ms total roundtrip latency extra loopback latency: 64639 frames use 32319 for the backend arguments -I and -O 64640.000 frames 1346.667 ms total roundtrip latency extra loopback latency: 64639 frames use 32319 for the backend arguments -I and -O 64639.999 frames 1346.667 ms total roundtrip latency extra loopback latency: 64639 frames use 32319 for the backend arguments -I and -O 64640.000 frames 1346.667 ms total roundtrip latency extra loopback latency: 64639 frames use 32319 for the backend arguments -I and -O 64640.000 frames 1346.667 ms total roundtrip latency extra loopback latency: 64639 frames use 32319 for the backend arguments -I and -O 64639.999 frames 1346.667 ms total roundtrip latency extra loopback latency: 64639 frames use 32319 for the backend arguments -I and -O 64640.000 frames 1346.667 ms total roundtrip latency extra loopback latency: 64639 frames use 32319 for the backend arguments -I and -O 64640.000 frames 1346.667 ms total roundtrip latency extra loopback latency: 64639 frames use 32319 for the backend arguments -I and -O 64640.000 frames 1346.667 ms total roundtrip latency extra loopback latency: 64639 frames use 32319 for the backend arguments -I and -O 65088.000 frames 1356.000 ms total roundtrip latency extra loopback latency: 65088 frames use 32544 for the backend arguments -I and -O 65088.000 frames 1356.000 ms total roundtrip latency extra loopback latency: 65088 frames use 32544 for the backend arguments -I and -O 65087.999 frames 1356.000 ms total roundtrip latency extra loopback latency: 65087 frames use 32543 for the backend arguments -I and -O 65152.000 frames 1357.333 ms total roundtrip latency extra loopback latency: 65151 frames use 32575 for the backend arguments -I and -O 65152.000 frames 1357.333 ms total roundtrip latency extra loopback latency: 65151 frames use 32575 for the backend arguments -I and -O 65152.000 frames 1357.333 ms total roundtrip latency extra loopback latency: 65152 frames use 32576 for the backend arguments -I and -O 65152.000 frames 1357.333 ms total roundtrip latency extra loopback latency: 65151 frames use 32575 for the backend arguments -I and -O 65216.000 frames 1358.667 ms total roundtrip latency extra loopback latency: 65216 frames use 32608 for the backend arguments -I and -O 64.000 frames 1.333 ms total roundtrip latency extra loopback latency: 63 frames use 31 for the backend arguments -I and -O 64.000 frames 1.333 ms total roundtrip latency extra loopback latency: 63 frames use 31 for the backend arguments -I and -O ?? Inv 256.000 frames 5.333 ms total roundtrip latency extra loopback latency: 256 frames use 128 for the backend arguments -I and -O 256.000 frames 5.333 ms total roundtrip latency extra loopback latency: 256 frames use 128 for the backend arguments -I and -O 640.000 frames 13.333 ms total roundtrip latency extra loopback latency: 640 frames use 320 for the backend arguments -I and -O 640.000 frames 13.333 ms total roundtrip latency extra loopback latency: 640 frames use 320 for the backend arguments -I and -O 640.000 frames 13.333 ms total roundtrip latency extra loopback latency: 639 frames use 319 for the backend arguments -I and -O 640.000 frames 13.333 ms total roundtrip latency extra loopback latency: 640 frames use 320 for the backend arguments -I and -O 640.000 frames 13.333 ms total roundtrip latency extra loopback latency: 640 frames use 320 for the backend arguments -I and -O 640.000 frames 13.333 ms total roundtrip latency extra loopback latency: 639 frames use 319 for the backend arguments -I and -O 640.000 frames 13.333 ms total roundtrip latency extra loopback latency: 639 frames use 319 for the backend arguments -I and -O 640.000 frames 13.333 ms total roundtrip latency extra loopback latency: 639 frames use 319 for the backend arguments -I and -O 640.000 frames 13.333 ms total roundtrip latency extra loopback latency: 640 frames use 320 for the backend arguments -I and -O 640.000 frames 13.333 ms total roundtrip latency extra loopback latency: 640 frames use 320 for the backend arguments -I and -O 768.001 frames 16.000 ms total roundtrip latency extra loopback latency: 768 frames use 384 for the backend arguments -I and -O 832.000 frames 17.333 ms total roundtrip latency extra loopback latency: 832 frames use 416 for the backend arguments -I and -O 832.000 frames 17.333 ms total roundtrip latency extra loopback latency: 832 frames use 416 for the backend arguments -I and -O 832.000 frames 17.333 ms total roundtrip latency extra loopback latency: 831 frames use 415 for the backend arguments -I and -O 832.000 frames 17.333 ms total roundtrip latency extra loopback latency: 832 frames use 416 for the backend arguments -I and -O 1024.000 frames 21.333 ms total roundtrip latency extra loopback latency: 1024 frames use 512 for the backend arguments -I and -O ?? 1024.000 frames 21.333 ms total roundtrip latency extra loopback latency: 1024 frames use 512 for the backend arguments -I and -O 1024.000 frames 21.333 ms total roundtrip latency extra loopback latency: 1023 frames use 511 for the backend arguments -I and -O 1024.000 frames 21.333 ms total roundtrip latency extra loopback latency: 1023 frames use 511 for the backend arguments -I and -O 1344.000 frames 28.000 ms total roundtrip latency extra loopback latency: 1344 frames use 672 for the backend arguments -I and -O -- Patrick Shirkey Boost Hardware Ltd

11 years, 9 months

Build error in Guitarix

by Gianfranco Ceccolini

Hi Hermann I've been trying to build the latest versions of Guitarix - both the git latest version (29 I believe) as the 28-2 - and both yield the same error when I try to use the -optimization flag package libcloog-ppl0 not found : optimization is disabled I'm using an Arch Linux on an Intel Atom N2800 and I have the AUR cloog-ppl 0.16.1-1 package installed. Is there something else to be done in order to get the optimization flag to work? Iǘe browsed the LAD archives and noticed there is already a tread with this error in topic for version 27. Can I discard the optimization flag and add the "march=native" instead? If yes, how should I do it? Can't wait to try the gx-fuzz on the MOD! Kind regards and congratulations for the effort on Guitarix. Here at the MOD Team we have it as on of our favourite plugins pack. Gianfranco

11 years, 9 months

[ANN] Vee One Suite 0.3.5 - Fall greetings released!

by Rui Nuno Capela

yet again, a new batch the Vee One Suite of old-school software instruments is out: synthv1 [1] polyphonic synthesizer, samplv1 [2] polyphonic sampler and drumkv1 [3] drum-kit sampler. as usual, all three are made available in dual form: - a pure stand-alone JACK client with JACK-session, NSM (Non Session management) and both JACK MIDI and ALSA MIDI input support; - a LV2 instrument plugin. as for this release changes: - First attempt on separating the DSP code from UI as runtime objects, effective for the LV2 plugin deploy. - MIDI channel filter switch is now introduced. - Fixed uninstall target make rule. - Mono(phonic) mode switch is now being introduced. - Another minor fix to note-off fast-release. all free and open-source Linux Audio software, distributed under the terms of the GNU General Public License (GPL) version 2 or later. so, here they go again: [1] 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/synthv1-0.3.5.tar.gz - source package: http://download.sourceforge.net/synthv1/synthv1-0.3.5-12.rncbc.suse123.src.… - binary packages: http://download.sourceforge.net/synthv1/synthv1-0.3.5-12.rncbc.suse123.i586… http://download.sourceforge.net/synthv1/synthv1-0.3.5-12.rncbc.suse123.x86_… [2] 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/samplv1-0.3.5.tar.gz - source package: http://download.sourceforge.net/samplv1/samplv1-0.3.5-12.rncbc.suse123.src.… - binary packages: http://download.sourceforge.net/samplv1/samplv1-0.3.5-12.rncbc.suse123.i586… http://download.sourceforge.net/samplv1/samplv1-0.3.5-12.rncbc.suse123.x86_… [3] drumkv1 - an old-school drum-kit sampler drumkv1 is (yet) an(other) old-school all-digital drum-kit sampler synthesizer with stereo fx. LV2 URI: http://drumkv1.sourceforge.net/lv2 website: http://drumkv1.sourceforge.net downloads: http://sourceforge.net/projects/drumkv1/files - source tarball: http://download.sourceforge.net/drumkv1/drumkv1-0.3.5.tar.gz - source package: http://download.sourceforge.net/drumkv1/drumkv1-0.3.5-8.rncbc.suse123.src.r… - binary packages: http://download.sourceforge.net/drumkv1/drumkv1-0.3.5-8.rncbc.suse123.i586.… http://download.sourceforge.net/drumkv1/drumkv1-0.3.5-8.rncbc.suse123.x86_8… see also: http://www.rncbc.org/drupal/node/709 enjoy && have fun! -- rncbc aka Rui Nuno Capela rncbc(a)rncbc.org

11 years, 9 months

Creative Music Coding Lab #6 - October 1st at STEIM

by Marije Baalman

Hi all, tomorrow it is time again for Creative Music Coding at STEIM, please join us! First episode of the new season! Calling all ChucK’ers, SuperColliders, Max and PureData patchers, CSounders, Fluxites, Overtoners, and all other tongues of creative coders. We welcome you to attend the fifth edition of the Creative Music Coding lab at STEIM. The CMC lab is an autonomous zone to try out sonic experiments as a group. And an opportunity to leverage the expertise of the group in realizing new artistic tools and processes through the medium of code. Many of the founding members of the group are indeed experts in their favorite languages, but we come from all technical levels of proficiency and enjoy helping one-another out. http://steim.org/event/creative-music-coding-lab-6/ Date: Tuesday, October 1st Time: 19:00 h Venue: Steim, Utrechtsedwarsstraat 134, Amsterdam Entry: Free There will be free coffee and tea to fuel the creativity. Let me know if you plan to attend! sincerely, Marije

11 years, 9 months

Screencasting with JACK [SOLVED!]

by J. Liles

As some of you may recall, every time I've posted a demo video to LAD, I've had to include a disclaimer excusing the poor quality due to a lack of functional screencasting tools. Well, it took a couple of weeks of hair pulling and many, many hours of testing, but I finally arrived at a solution. Anyone who wants to create a screencast and record audio via JACK *in perfect sync* must do the following: Get ffmpeg. Apply this patch to it: https://github.com/original-male/FFmpeg/commit/d02509d04d396a98646ca81e9ba3… Build it with vorbis and h264 support. Then, start your favorite desktop environment. I use Xephyr for this. Have jack running (at -r 48000) Then run the following command: ffmpeg -fflags +genpts+igndts -f x11grab -vsync 0 -r 30 -s 1920x1080 -i :${DISPLAY}.+0,0 -vcodec h264 -f jack -ac 2 -r:a 48000 -i screencast -acodec pcm_s16le -r:v 30 -vsync 2 -async 1 -map 0:0,1,0 -map 1:0 -preset ultrafast -qp 0 "$FILE" Where DISPLAY is the number of your X11 display and FILE is the filename for the screencast. I use a .mkv extension for the matroska container. Remember to connect the streams you want recorded to the 'screencast' JACK inputs! With this setup I'm able to record a full 30 FPS @ 1080P with audio in perfect sync. Please share your results too. With some more evidence I might have a good case to get ffmpeg to accept my patch. Enjoy!

11 years, 9 months

ARM audio coder

by Jean-Baptiste Thiebaut

Hi there, Apologies for cross-posting. We're looking for a Linux embedded coder, preferably in London, for a short-term optimisation gig on an ARM 8. To start immediately. Salary depending on experience / delivery. http://weareroli.com Let me know if you're interested! Goal: - Optimisation of C++ code to match the target accelerator engine NEON - Development of a custom shared DSP library based on the NEON instruction set Skills: - Excellent understanding of the low level ARM architecture (Vector floating point unit, SIMD, NEON) - High proficiency with C/C++, ASM, Unit Testing - Experience in audio DSP algorithm embedded integration - High efficiency audio coding experience - Excellent knowledge of the standard tools such as gcc, gbd Best regards, Jean-Baptiste

11 years, 9 months

Re: [LAD] [off-list] who wants contribute to Advanced Gtk+ Sequencer

by Joël Krähemann

Am Dienstag, den 24.09.2013, 20:11 +0200 schrieb Ralf Mardorf: > Hi :) > > I used the new tar, but next time I can checkout from svn. > > It failed to build again. > > checking for XMLRPC... no > configure: error: Package requirements (xmlrpc >= 1.32.5) were not met: > > No package 'xmlrpc' found > > Consider adjusting the PKG_CONFIG_PATH environment variable if you > installed software in a non-standard prefix. > > Alternatively, you may set the environment variables XMLRPC_CFLAGS > and XMLRPC_LIBS to avoid the need to call pkg-config. > See the pkg-config man page for more details. > [rocketmouse@archlinux ags_0.3.99]$ sudo pacman -Q xmlrpc-c > xmlrpc-c 1:1.33.03-1 > > Regards, > Ralf > https://apps.fedoraproject.org/packages/xmlrpc-c-client alien the package if using debian or derivates. Is without xmlrpc but has missing bugfixes ... https://github.com/weedlight/ags/tree/master/0.4.0/src/ags I'll update github.com repo excluding xmlrpc. The server isn't started by default and is only a collection of ideas whereas many skelletons for a XML based scripting client. See for further details: https://sourceforge.net/p/ags/code/HEAD/tree/src/ags-client/scripting/ags_s… regards Joël

11 years, 9 months

who wants contribute to Advanced Gtk+ Sequencer

by Joël Krähemann

Hi, I'm writing a software synth/sequencer called Advanced Gtk+ Sequencer. It won't take much time till first pre-release 0.4.0 I got basic functions working. Now I'm pleased to ask if someone wants to contribute. Note pulseaudio interferes with Advanced Gtk+ Sequencer to achieve best results I even recommend WindowMaker as desktop or any minimal window manager of your choice. http://sourceforge.net/projects/ags/ If your asking yourself how to use Advanced Gtk+ Sequencer please take a look at a screencast I just made this morning on Google+ The project features a wiki with some programming howtos and explanation of internals. bye Joël

11 years, 9 months

Re: [LAD] Forking JackMix

by Thijs van severen

Behold the beauty of FOSS ! (A fine example of how it can also be done) Op 20-sep.-2013 23:46 schreef "Arnold Krille" <arnold(a)arnoldarts.de> het volgende: On Fri, 20 Sep 2013 12:45:45 +0100 Dr Nicholas J Bailey <nicholas.bailey(a)glasgow.ac.uk> wrote: > Ha, it seems I submitted news about a fork right into a firestorm! > > Well, I've done it, take it or leave it. > > For the record, I did email Arnold Krille several times without > getting a reply, which is fine because there isn't a law which says > he has to answer emails from me. Mostly due to the fact that I don't answer when there is no time. And then tend to forget these mails when they drop below the fold... > Also, the (C) on that software says > -2007, so I went ahead. It probably wasn't a good time in retrospect. It was at the best of times! And its not the first fork of JackMix, but probably the first on github... > I didn't intend to upset Arnold or anybody else, but the only way I'm > taking my "fork" off github is if Arnold thinks it's good enough to > make it mainstream, which would be an honour and a privilege. The main concern for me is that (if I understand git correctly) its now not possible for me to import my private subversion history of JackMix into github and then officially mark yours as the fork... As my vcs was private all the past time, thats not a big concern. You could also have given your project a new name. Which is hard when the good names are all taken... But seeing as I don't really have time for audio-programming since quite some years, please continue! > I still really hope Arnold is going to let me ask him some > questions about his code! I don't know if I can answer your questions. As you rightly noticed, its been some time since I wrote that code. I would write it differently today (test-driven, gui in python and only the mixing-engine in C++). I kind of started parts for a rewrite, there's a mixing-matrix-gui in ffado-mixer thats similar and I have some local beginnings of a crossbar-router for jack (patchage with rows and cols instead of a free canvas) with network-transparent separation of gui and core. But that never really hit of with me due to a lack of time and need... Anyway, please remind me to look at your project, create a nice page on github for it and remind me to set a link to that page on my domain. I hereby proclaim you the new lead for JackMix! Have fun, Arnold _______________________________________________ Linux-audio-dev mailing list Linux-audio-dev(a)lists.linuxaudio.org http://lists.linuxaudio.org/listinfo/linux-audio-dev

11 years, 9 months

Re: [LAD] Aeolus

by geoff

I agree with Nils 100%. Fons mentions the second fork seems to be changing the license. Both situations are ignorant of the spirit of FOSS in my opinion. If you go commercial let me know. I'll buy everything you make ! g Sent from my smartphone. -------- Original message -------- From: Fons Adriaensen <fons(a)linuxaudio.org> Date: 19/09/2013 7:16 AM (GMT+10:00) To: Linux Audio Users <linux-audio-user(a)lists.linuxaudio.org>,Linux Audio Developers <linux-audio-dev(a)lists.linuxaudio.org> Subject: [LAD] Aeolus Hello all, It has come to my attention that there are ATM at least two 'forks' of Aeolus. The first by the MuseScore team, the second by one Maurizio Gavioli. Neither of them even had the decency to let me know of their work, and both are taking Aeolus in a direction I do not approve of. Gavioli has even added his 'copyright' to the sources of the libraries that Aeolus depends on but which are not part of its source distribution. Apparently the intention is to release incompatible versions of those as well. If this is typical for the attitude taken by the Linux Audio community then my motivation to contribute to it will take a serious blow. As announced previously, there will be a fully reworked release of Aeolus next year (on the occasion of its 10th birthday). Apart from major improvements to the audio code it will be completely OSC controlled. None of this will be compatible with the forks of course, they'll find themselves instantly obsolete. And I will make sure that this sort of thing won't happen again, even if that means a more restrictive license. Ciao, -- 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) _______________________________________________ Linux-audio-dev mailing list Linux-audio-dev(a)lists.linuxaudio.org http://lists.linuxaudio.org/listinfo/linux-audio-dev

11 years, 9 months

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Linux-audio-dev