Linux-audio-dev

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7501 discussions

by James Courtier-Dutton

Hi, Is there a recognized method for calibrating a sound card? e.g. For Playback, one sends a sample .wav PCM file to the sound card, then measure the analog output from the line-out. If the sound card itself provides 0dB of Gain, what should be the measured figure? Can this be done with a simple AC volt meter? There seems to be some debate, with regards to ALSA, as to whether the line-out is at the correct level if one sets all the ALSA mixer controls to 0dB. James

17 years, 2 months

audio meters nostalgia

by Fons Adriaensen

The first (beta) release of Jmeters is available at <http://www.kokkinizita.net/linuxaudio/downloads> Jmeters is a Jack multichannel audio level meter app. It looks very similar to meterbridge since it uses the same pixmaps. This first release offers VU, PPM and stereo versions of the same. The stereo versions have two indicator needles on the same scale. I've never seen a twin VU, but stereo (or M/S) PPMs *do* exist. Later releases will add bargraph meters, digital peak indicators for the analog ones, and a stereo correlation meter. The main difference to meterbridge is that Jmeters has the correct ballistics for both the VU and the PPM. The VU meter measures the average of the absolute value of the signal, 'average' meaning a second order filter that reaches 99% in 300ms and overshoots between 1.0 and 1.5%. It is calibrated to indicate 0dB for a sine wave at -10dB w.r.t. digital full scale (which is +/-1 peak in this case). The particular VU scale used is not entirely linear and starts at -20dB (it's one designed for a passive VU meter with a diode bridge), so the meter will not move at all for inputs below that level. Later versions may use a VU scale designed for an active meter which doesn't have this threshold. The PPM is a pseudo-peak meter. It will indicate 80% of the steady-state value for a 10ms burst, and fall by 24db in 2.8s. Each scale division (1..7) represents 4dB. It is calibrated to indicate '7' (+12 dB on the EBU scale) for 0dB FS. For speech and music with distinct short peaks the PPM will usually indicate higher. For music with continuous long notes, and for heavily compressed signals the VU indicates higher. Both meters require some 'getting used to' in order to read them correctly. You can modify the calibration by using the -g(ain) option, but it should normally not be necessary. Enjoy ! -- FA Laboratorio di Acustica ed Elettroacustica Parma, Italia Lascia la spina, cogli la rosa.

17 years, 2 months

FreeBoB 1.0.11 released (package fix)

by Pieter Palmers

The 1.0.10 package released a few weeks ago seems to have some packaging issues (missing files etc...). Therefore a new package has been uploaded that should fix these issues. Available at sourceforge: https://sourceforge.net/project/showfiles.php?group_id=117802 Greets, Pieter

17 years, 2 months

Re: [LAD] [ANN] jack_capture V0.9.10 and Snd-ls V0.9.8.16

by Jonathan Woithe

> jack_capture > : > *Added the --meterbridge / -mb option, which automatically > starts Steve Harris' meterbridge (http://plugin.org.uk/meterbridge/) > and constantly connects them to the same ports as jack_capture > is connected to. Nice - this will save me the hassle of starting meterbridge manually when setting up for recording and having to make sure that meterbridge's channels actually match jack_capture's channels. Thanks for the update! jonathan

17 years, 2 months

Re: [LAD] [LAU] new! linuxmusicians.com

by Ivica Ico Bukvic

> I'm just playing devil's advocate here, but the Linux audio community > hasn't exactly been lacking in this area: > > http://www.linuxaudio.org/ > > Is a portal to all kinds of things related to Linux audio (including > this mailing list). > > Not to mention the http://linux-sound.org/ site also. Let me take this one step further and state that the entire linux-sound.org database has been ported over into apps.linuxaudio.org with full user access to maintaining/altering the content which makes linux-sound maintenance unnecessary (esp. since Dave has effectively decided not to keep it up to date as often as he would like to). I think it would be nice if we all put efforts towards a common goal, especially since linuxaudio.org is all about the community. If there is an aspect of the lao domain you don't like, you are more than welcome to contribute... That being said, as always, we continue to be in dire need of assistance/support in making linuxaudio.org better. This is why I perceive the fragmentation of community resources to be moving us farther away from the place where we ought to be and where the consolidated online presence would be truly useful and meaningful to a community as small as ours. Best wishes, Ivica Ico Bukvic, D.M.A. Director, Linuxaudio.org Virginia Tech Dept. of Music - 0240 Blacksburg, VA 24061 (540) 231-6139 (540) 231-5034 (fax) ico(a)linuxaudio.org www.linuxadio.org

17 years, 2 months

[ANN] jack_capture V0.9.10 and Snd-ls V0.9.8.16

by Kjetil S. Matheussen

jack_capture ============ jack_capture is a program for recording soundfiles with jack. Its default operation is to capture whatever sound is going out to your speakers into a file. (But it can do a number of other operations as well...) Screenshot: http://www.notam02.no/arkiv/src/jack_capture.png http://www.notam02.no/arkiv/src/?M=D 0.9.7 -> 0.9.10: *Fixed segfault in case the --channels / -c argument is higher than the number of ports which is possible to connect to. *Added a terminal vu meter by default. It'll also display red in case the recorded jack value is equal to or higher than 1.0. Use "-dv" to disable. *Added the --meterbridge / -mb option, which automatically starts Steve Harris' meterbridge (http://plugin.org.uk/meterbridge/) and constantly connects them to the same ports as jack_capture is connected to. *Added the --write-to-stdout / -ws option which writes 16 bit little endian sound to stdout. Code made by looking at jack-stdout.c by Robin Gareus. *Added the --print-formats / -pf option. *Replaced jack_client_new() with jack_client_open() Snd-ls V0.9.8.16 ================ Snd-ls is a distribution of Bill Schottstaedt's sound editor SND. (http://ccrma.stanford.edu/software/snd/) Its target is people that don't know scheme very well, and don't want to spend too much time configuring Snd. It can also serve as a quick introduction to Snd and how it can be set up. Snd-ls also serves as base code for the San-Dysth softsynth (http://www.notam02.no/~kjetism/sandysth/) and the Snd-rt music programming language (http://www.notam02.no/arkiv/doc/snd-rt) http://www.notam02.no/arkiv/src/snd/ 0.9.8.13 -> 0.9.8.16: *Fixed definstrument and faust. *Removed deprecated CAIRO_FONT_TYPE_ATSUI *Updated <slider> in snd-rt, <slider> in gui. (bugs reported by "border") *Fixed definstrument. *Replaced jack_client_new with jack_client_open

17 years, 2 months

[ANNOUNCE] pytagsfs version 0.6.0

by Forest Bond

Hi, [I've sent this message to several large mailing lists. Please be sure any replies don't get sent to all of them, i.e. don't use the Reply-to-all feature of your mail client.] I'm pleased to announce the release of pytagsfs version 0.6.0. This release includes significant enhancements as well as critical bug fixes: * Support for mkdir/rmdir. * Improved performance for readdir. This makes directory listings faster. * Fix for broken stat result caching. This bug would have caused significant performance problems. * Fix for incorrect directory timestamps. * Fix for bad handling of updates to previously unrepresentable source files. This bug would cause files to not appear under the mount tree when tagged. * Fix for incompatibility with version 0.2 of the Python FUSE bindings. Thanks to Chris Pickel and Jeremy Jones for reporting bugs and testing fixes. The full set of changes for this release is available: http://www.pytagsfs.org/Changelogs/0.6.0 To download this release: http://www.pytagsfs.org/Download pytagsfs is a FUSE filesystem that arranges media files in a virtual directory structure based on the file tags. For instance, a set of audio files could be mapped to a new directory structure organizing them hierarchically by album, genre, release date, etc. File tags can be changed by moving and renaming virtual files and directories. The virtual files can also be modified directly, and, of course, can be opened and played just like regular files. For a more thorough introduction, see: http://www.pytagsfs.org/Introduction Please visit http://www.pytagsfs.org to obtain more information. Feel free to contact me with any questions. Feedback is appreciated. Thanks, Forest -- Forest Bond http://www.alittletooquiet.net http://www.pytagsfs.org

17 years, 2 months

FreeBoB 1.0.10 released

by Pieter Palmers

Not an April's fool, but for real: libfreebob 1.0.10 has been released. This maintenance release addresses the following: - Add a configure option to disable the samplerate setting at startup. This enables the use of e.g. the Focusrite Saffire Pro with FreeBoB. - implement clipping - generate an xrun when a dropped packet has been detected Available at sourceforge: https://sourceforge.net/project/showfiles.php?group_id=117802 Upgrade if you feel like doing so. If all is fine, don't. Greets, Pieter

17 years, 3 months

The NASPRO project is looking for students for GSoC 2008

by Stefano D'Angelo

Hello, The NASPRO project (http://naspro.atheme.org) is partecipating to the Google Summer of Code 2008 as part of the atheme.org project and is looking for students who might be interested in doing some coding. Here are a couple of project ideas: http://wiki.atheme.org/SummerOfCode2008Ideas, but feel free to purpose your own. The deadline for application is quite near, so, if you want to contribute, don't loose time. Good luck, Stefano D'Angelo zanga.mail(a)gmail.com

17 years, 3 months

Re: [LAD] [Consortium] OpenExpo 2008 in Karlsruhe

by Ivica Ico Bukvic

I think this is a very good opportunity to showcase some of the latest milestones in the linux audio realm. Do we have anyone in the vicinity who might be able to help in manning the booth? Best wishes, Ivica Ico Bukvic, D.M.A. Director, Linuxaudio.org Virginia Tech Dept. of Music - 0240 Blacksburg, VA 24061 (540) 231-6139 (540) 231-5034 (fax) ico(a)linuxaudio.org www.linuxadio.org > -----Original Message----- > From: consortium-bounces(a)lists.linuxaudio.org [mailto:consortium- > bounces(a)lists.linuxaudio.org] On Behalf Of Reinhard > Sent: Saturday, March 29, 2008 3:23 PM > To: consortium(a)lists.linuxaudio.org > Subject: [Consortium] OpenExpo 2008 in Karlsruhe > > Hi, > > A friend of mine just showed me that there will be a german > open source expo. I already wrote on the german linux audio > board in case somebody wants to take part as a project (probably > a booth). > > Unfortunately it is really close to the Berlin Linuxtag 2008, > so it is probably mainly interesting for those living in the > south of germany. > > As many audio developers and users live in south germany I hope that > someone is willing to make an LinuxAudio/JackLab/Studio64 or whatever > project booth. > > Kind regards, > > Reinhard Katzmann > -- > Software-Engineer, Developer of User Interfaces > Project: Canorus - the next generation music score editor - > http://canorus.berlios.de > GnuPG Public Key available on request > _______________________________________________ > Consortium mailing list > Consortium(a)lists.linuxaudio.org > http://lists.linuxaudio.org/mailman/listinfo/consortium

17 years, 3 months

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Linux-audio-dev