Linux-audio-dev

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7516 discussions

Re: [LAD] [OT] CD-R masters, block error rate and dvd-r mystery...

by Joern Nettingsmeier

hi anthony! thanks for your reply. i'm cc:ing the list so that others can benefit from it as well... Anthony Kozar wrote: > Hi Joern, > > This is just a shot in the dark, but most audio CD tracks have a "lead-in" > time of 2 or more seconds. CD players will typically count down using > negative numbers for this time and the track is considered to begin after > the lead-in. Perhaps one of your drives (the DVD drive?) is reading the > lead-in as part of the track? > > (2 seconds x 44100 samples/sec. x 2 channels x 2 bytes/sample = 352,000 > bytes) i can rule this out, because although i used both a dvdr and cdr drive for burning, both cds were read back in using the cdr drive. any differences must have occured during burning. but since i used the same toc file and disk-at-once mode, it's unlikely that the lead-in got interpreted differently in both drives... but you are right, this being a live cd, i used pre-gaps and non-silent gaps extensively - i'll investigate some more along those lines. best, jörn -- jörn nettingsmeier home://germany/45128 essen/lortzingstr. 11/ http://spunk.dnsalias.org phone://+49/201/491621 Kurt is up in Heaven now.

17 years, 3 months

Towards a truely realtime capable FOSS audio distribution | A guide to the Jack Source Code

by micu

Hello everybody, my name is micu and I study computer science at the Dresden University of Technology. During an internship at the operating systems chair of the university, I ported ALSA to the chairs operating system DROPS aka TUD:OS [1,2]. To let ALSA talk to the hardware and provide to it the usual linux kernel environment DDEKit / DDELinux [3] were used. As a kernel-userland interface I wrote a very small emulation layer, which makes it possible to link SALSA-lib [4] against the ALSA "kernel" part. So right now, we have a somewhat stable ALSA server running in userland on top of DROPS without changing ALSA or the SALSA-lib source code. I have been continuing this project within my diploma thesis. The remit of the thesis can be found here [5]. It is the goal of the thesis to take some steps towards a truly realtime capable (meaning with time constraints to be guaranteed) FOSS audio distribution. Here [6] you can see a raw version of my requirements definition. The architecture we are going to use is --- how could it be different :) --- Jack or Jackdmp (with a strong bias towards Jackdmp). To get the mess out of my head, I wrote a short guide [7] to the Jack source code. It is a pretty raw version and it isn't finished in any way yet; but I won't work on it any longer. Nevertheless, it might be helpful to other developers new to Jack. Therefore, if you will, you may get it under any license you wish (attribution of the author is appreciated :) to publish and improve it. Of course, the long term goal of the project won't be met to any extent during my thesis and I have no idea, if this project will be continued here at the university. Neither do I know, whether I will have time to work on it afterwards. To make a long story short: I would like to ask my first three questions.... so far :) 1.) Do you agree on having a truly real-time capable architecture in the FOSS audio world would be a really great thing --- and would you say, getting such a thing maybe could get a (major) goal of the pro audio FOSS community? 2.) Concerning our Jack vs. Jackdmp decision: http://jackaudio.org/ says, Jackdmp is going to be Jack 2.0. How likely and how soon do you think is this going to happen? 3.) I guess, there is a very minor bug in the lines 236, 237 of libjack/driver.c, svn revision 2734: The type castings should be switched. Thanks a lot in advance and please excuse my bad english :(. Regards, micu BTW: I love Jack and I love ardour --- and therefore I love you :). ========================================== [1]http://www.realtimelinuxfoundation.org/variants/variants.html#VARIANTS_DR… [2]http://www.osnews.com/story.php/15814/Introduction-to-TUD-OS/ [3]http://demo.tudos.org/dsweeper_tutorial.html [4]http://www.alsa-project.org/main/index.php/SALSA-Library [5]http://www1.inf.tu-dresden.de/~s3418892/task.txt [6]http://www1.inf.tu-dresden.de/~s3418892/Require.pdf [7]http://www1.inf.tu-dresden.de/~s3418892/AgttJSC.txt -- GnuPG: https://www1.inf.tu-dresden.de/~s3418892/micuintus.asc Fingerprint: 1A15 A480 1F8B 07F6 9D12 3426 CEFE 7455 E4CB 4E80

17 years, 3 months

[OT] CD-R masters, block error rate and dvd-r mystery...

by Jörn Nettingsmeier

hi everyone! for the first time ever, i have to prepare a cd-r master that will go into production without verification by the plant (yeah, i know, but my client got a *really* cheap deal ;) so i will have to make sure the data is ok and the block error rate is low. * how do i measure BLER on CD-Rs with free software tools? * how on earth can the same content burned via cdrdao to a CD-R on a cdrw drive (Plextor) and a dvdrw drive (LG) differ in several hundred thousand bytes when read back in with cdparanoia? both drives seem ok, i frequently use them to burn data cds and dvds which perform ok. any hints welcome, tia, jörn

17 years, 3 months

Linux Plumbers Conference CFP Extended!

by Lennart Poettering

Heya! The Call For Papers for the Linux Plumbers Conference has been extended until *July 31st*! Anyone doing (audio) infrastructure work on Linux? If so, please make sure to join us at the Linux Plumbers Conference in Portland/Oregon in September. I will be doing a track about "Audio" there and would like to make sure that everyone who does audio infrastructure work will submit a paper, or at least attend, or maybe just knows about this conference! It's a conference about the kernel-userspace interfacing, about the lower levels in our software stack. For further details, checkout the conference website: http://www.linuxplumbersconf.org/ (Sorry for this spam!) Lennart -- Lennart Poettering Red Hat, Inc. lennart [at] poettering [dot] net ICQ# 11060553 http://0pointer.net/lennart/ GnuPG 0x1A015CC4

17 years, 3 months

Searching for USB Sound-Chip

by Michelle Konzack

Hello *, I am developing a new Hardware and I am searching for an Ausio/Soundchip which support natively USB. And of course, it should be supported by ALSA and posible OSS (for embedded systems). All I need is to capture the ouput of a GSM-Chip and of course, output Sound/Voice to the GSM-Input. Volume control and muting is neccesary too. Can anyone recommend a Low-Cost chip which is suitable? The chip can be any SMD/QFN/DFN package since I have SMS and Infra-Red Welding Systems available Thanks, Greetings and nice Day/Evening Michelle Konzack Systemadministrator 24V Electronic Engineer Tamay Dogan Network Debian GNU/Linux Consultant -- Linux-User #280138 with the Linux Counter, http://counter.li.org/ ##################### Debian GNU/Linux Consultant ##################### Michelle Konzack Apt. 917 ICQ #328449886 +49/177/9351947 50, rue de Soultz MSN LinuxMichi +33/6/61925193 67100 Strasbourg/France IRC #Debian (irc.icq.com)

17 years, 3 months

LV2 dynamic manifest extension preview

by Stefano D'Angelo

Hi, This should be almost definitive: http://naspro.atheme.org/content/dynamic-manifest-extension-lv2 You have one day left to complain :-P (and please, someone check my English). What about supporting that in SLV2? (yes Dave R., I'm talking to you ;-) Stefano

17 years, 3 months

[ANN] Qtractor 0.2.0 (frolic demoiselle) is out!

by Rui Nuno Capela

Qtractor 0.2.0 (frolic demoiselle) is out! ------------------------------------------ Qtractor is an audio/MIDI multi-track sequencer application written in C++ with the Qt4 framework [1]. Target platform is Linux, where the a Jack Audio Connection Kit (JACK) for audio [2] and the Advanced Linux Sound Architecture (ALSA) for MIDI [3] are the main infrastructures to evolve as a fairly-featured Linux desktop audio workstation GUI, specially dedicated to the personal home-studio. Qtractor is free open-source software, distributed under the GNU General Public License (GPL) [15]. Author: Rui Nuno Capela <rncbc at rncbc dot org> Weblog: http://wwww.rncbc.org Website: http://qtractor.sourceforge.net Project page: http://sourceforge.net/projects/qtractor Download: http://downloads.sourceforge.net/qtractor/qtractor-0.2.0.tar.gz Executive summary: - Multi-track audio and MIDI sequencing and recording. - Developed on pure Qt4 C++ application framework [1] (no Qt3 nor KDE dependency). - Uses JACK [2] for audio and ALSA [3] sequencer for MIDI as infrastructure. - Traditional multi-track tape recorder control paradigm. - Audio file formats support: OGG (via libvorbis [6]), MP3 (via libmad [7], playback only), WAV, FLAC, AIFF and many, many more (via linsndfile [4]). - Standard MIDI files support (format 0 and 1). - Non-destructive, non-linear editing. - Unlimited number of tracks per session/project. - Unlimited number of overlapping clips per track. - XML encoded session/project description files (SDI). - Point-and-click, multi-select, drag-and-drop interaction (drag, move, drop, cut, copy, paste, delete, split) - Unlimited undo/redo. - Built-in mixer and monitor controls. - Buil-in connection patchbay control and persistence (a-la QjackCtl [13]). - LADSPA [5], DSSI [11] and native VSTi [12] plug-in support. - Unlimited number of plug-ins per track or bus. - Plug-in presets, programs and chunk/configurations support. - Audio/MIDI clip fade-in/out (linear, quadratic, cubic). - Audio clip time-stretching (WSOLA-like or via librubberband [9]), pitch-shifting (vib librubberband [9]) and samplerate conversion (via libsamplerate [8]). - Audio/MIDI track export (mix-down, merge). - Audio/MIDI metronome bar/beat clicks. - MIDI clip editor (piano roll). - MIDI instrument definitions (a-la Cakewalk(tm) [15]) - JACK transport sync master. - MMC control surface enabled. - Configurable keyboard shortcuts. Requirements: Mandatory: libqt4 [1], libjack [2], libasound [3], libsndfile [4], LADSPA [5]. Optional: libvorbis [6], libmad [7], libsamplerate [8], librubberband [9], liblo [10], DSSI [11], VST-SDK [12]. Disclaimer: Qtractor is still in some alpha stage of development, although already functional it surely has a plenty of lurking bugs. It also lacks some features that some might find critical in the application field. All is not lost, as the following are among the ones planned to be worked on in the times to come (not in any particular order): - Automation and MIDI controller mapping. - Session/project templates. - Puch-in/out and loop recording (takes). - Audio clip cross-fading. - Audio effect send/return aux. inserts. - Clip locking, muting, normalize (gain). - LV2 plug-in support. - JACK MIDI support. - Tempo and key signature map. - Paste-repeat command. - MIDI SysEx manager. - MIDI event list editor. - MIDI editor (piano roll) draw mode. - MIDI groove/swing quantize. - OSC interface. - Scripting. - Etc. etc. Change-log: 2009-07-18 0.2.0 The Frolic Demoiselle - MIDI clip filename revision logic is now introduced, thus avoiding the proliferation of several numbered SMF's on each edit/save; some lurking bugs were exposed in the MIDI clip externalization method but promptly squashed. - Fixed a mouse release event glitch while in drag-and-drop items in the Files tree list widget. - A dummy plugin type option has been devised, just to bear with some troubled behavior of the lovely JUCETICE plugins (View/Options.../Plugins/Experimental/Dummy VST plugin scan). Bad news are that all, yes all as in every native VST plugins, are indistinguishable from being just pure audio effects, either mono or stereo, whatever, and thus all being considered full-blown stereo VSTi instruments (which are the vast mainstream and rather interesting majority, nevertheless:). - The plugin selection dialog (Add Plugin...) now features the option whether the selected plugins should be activated on insert. - Mixer strip titles now have distinguishable type icons, either for audio or MIDI, and shown on all buses and track strips. - Major optimization breakthrough: muted audio tracks aren't streamed any longer, saving precious CPU cycles from decoding, resampling, pitch-shifting, time-stretching, plugin effects, whatever. - Incredible as it might be, audio/MIDI track record monitoring is now mixed (or merged) with rolling playback content, thus not as mutually exclusive between record and playback states anymore; also, track mute/solo states doesn't apply to recording material anymore. - Main form timer slot gets corrected and now independent of current process buffer-size in regard to JACK transport synchronization. - All file references in session state file are now stored as relative paths to main session directory. - DSSI/VSTi plugin presets can now be explicitly recalled from file (ie. Open/load preset) through this new tool button whether visible while in the generic plugin form. - Due to some trouble with newer Qt >= 4.4 applications regarding font size configuration, a new global user option is now available to the rescue: View/Options... /Display/Base font size (default is no-op). - Logarithmic scale is now taken into effect by control parameter sliders, in the generic plugin editor dialog as provided by LADSPA and DSSI plugin types. - MIDI track bank/program does not default to zero (PC#0) anymore. - Second attempt for Qt4.4 build support, regarding the bundled atomic primitives, now corrected and way more seriously :). - Long due DSSI/VSTi plugin host implementation has taken shape for MIDI instruments (eg. soft-synth plugins); DSSI reached its full host implementation and VSTi is already kicking as well (HIGHLY EXPERIMENTAL). - DSSI/VSTi plugin presets may now be stored to external XML files, which should include all parameter values and configuration data chunks, taken as proper state snapshot and subject for recall. - Dedicated audio output bus option is now also accessible for all MIDI instrument plugins, either set globally as a default mode in View/Options.../Plugins/Instruments or in the plugin context menu for MIDI tracks, as an undoable command. - Fixed a potential crash-exception due to freeing a null-pointer, raised on some ever stringent platforms and while adding tracks to empty sessions, which is the same to say this was crashing more than always:). - Loop turn-around is now taken care of, as this has been found missing and causing noticeable gapping when un-muting or changing MIDI track events while in playback. - An off-by-one bug was fixed while inside MIDI cursor backward seek method, which was missing all other events that have the same exact onset timing. - Attempt to load Qt's own translation support and get rid of the ever warning startup message, unless built in debug mode. (transaction by Guido Scholz, while on qsynth-devel, thanks). - Only one application instance is now allowed to be up and running, with immediate but graceful termination upon startup iif an already running instance is detected, which will see its main widget shown up automatically (Qt/X11 platform only). - Clip fades have now a slight transparency. - Avoid loop read-ahead on initial audio clip loading. - Messages file logging makes its first long overdue appearance, with user configurable settings in View/Options.../Logging; options dialog was slightly rearranged and moved the Plugins section into a new tab page. - Audio/MIDI drifting correction was missing its own correct and due (re)initialization whenever playback is (re)started; also, MIDI metering synchronization has been fixed once again. - Fixed session cursor backward seeking, specially applicable when playback passes the end of overlapped clips. - Fixed potential crash when opening bogus audio files. - Time-stretch FIFO buffer implementation is now made generic, as template, fixing a destructor memory leak in the process. - Include legacy headers, stdlib.h and string.h, where necessary to build with stricter gcc/g++ >= 4.3. References: [1] Qt4 (core, gui, xml), C++ class library and tools for crossplatform development and internationalization http://www.trolltech.org/products/qt/ [2] JACK Audio Connection Kit http://jackaudio.org/ [3] ALSA, Advanced Linux Sound Architecture http://www.alsa-project.org/ [4] libsndfile, C library for reading and writing files containing sampled sound http://www.mega-nerd.com/libsndfile/ [5] LADSPA, Linux Audio Developer's Simple Plugin API http://www.ladspa.org/ [6] libvorbis (enc, file), Ogg Vorbis audio compression http://xiph.org/vorbis/ [7] libmad, High-quality MPEG audio decoder http://www.underbit.com/products/mad/ [8] libsamplerate, The secret rabbit code, C library for audio sample rate conversion http://www.mega-nerd.com/SRC/ [9] librubberband, Rubber Band Audio Time Stretcher, an audio time-stretching and pitch-shifting library http://breakfastquay.com/rubberband/ [10] liblo, Lightweight OSC implementation (needed for DSSI GUI support) http://liblo.sourceforge.net/ [11] DSSI, an API for soft synth plugins with custom user interfaces http://dssi.sourceforge.net/ [12] VST SDK, Steinberg's Virtual Studio Technology (see README.VST) http://www.steinberg.net/ [13] QjackCtl - JACK Qt GUI Interface http://qjackctl.sourceforge.net [14] GNU General Public License http://www.gnu.org/copyleft/gpl.html [15] Cakewalk (by Roland), powerful and easy-to-use tools for Windows-based music and sound production http://www.cakewalk.com/ Cheers && Enjoy.

17 years, 3 months

[ot] anyone firm in readline

by Julien Claassen

Hello everyone! I'm looking for someone knowing readline and its pitfalls. I'm working with readline and have my troubles: Namely application specific completion of file- and directory names and the treating of names with spaces. Please can someone help me here? Off list would be best I guess. My mail-address can be ssen by any member. Please folks I'm absolutely stuck here. Kindest regards Julien -------- Music was my first love and it will be my last (John Miles) ======== FIND MY WEB-PROJECT AT: ======== http://ltsb.sourceforge.net the Linux TextBased Studio guide ======= AND MY PERSONAL PAGES AT: ======= http://www.juliencoder.de

17 years, 3 months

USB Sound Chip

by Michelle Konzack

Hello *, For a project with selfmade hardware (prototype and will be selled over my Website if it is working as I want), I am searching for a very Low-Cost soundchip since I need only Line-IN/OUT and it is only connected to the Line-IN/OUT of a GSM-Chip. Can someone tell me, which Low-Cost USB-Soundchip is perfectly supported under Linux 2.4 from scratch? Linux 2.4 must be, since there are to many embedded systems where size mather. Thanks, Greetings and nice Day/Evening Michelle Konzack Systemadministrator 24V Electronic Engineer Tamay Dogan Network Debian GNU/Linux Consultant -- Linux-User #280138 with the Linux Counter, http://counter.li.org/ ##################### Debian GNU/Linux Consultant ##################### Michelle Konzack Apt. 917 ICQ #328449886 +49/177/9351947 50, rue de Soultz MSN LinuxMichi +33/6/61925193 67100 Strasbourg/France IRC #Debian (irc.icq.com)

17 years, 3 months

[ANN] Qsynth 0.3.3 Knobs Galore!

by Rui Nuno Capela

Greetings, Thanks to Pedro Lopez-Cabanillas and Guido Scholz, this Qsynth release is now a reality. Main new features are a the new rotating knob style options, first full translations, German and Spanish and last but not least, there's this Windows(TM) all-in-one package available (includes FluidSynth port) for your (sick:) pleasure only. Please read below the brilliant notes from Pedro about this breakthrouth release. Yes, before's too late: Qsynth 0.3.3 (unstable-qt4) is out! For the clueless, Qsynth is a Qt GUI frontend application to the excellent FluidSynth (http://www.fluidsynth.org) soft-synth library implementation for the SoundFont 2 specifications. Available from the usual place: http://qsynth.sourceforge.net http://sourceforge.net/projects/qsynth There's the change log for this point release: - Due to some trouble with newer Qt >= 4.4 applications regarding font size configuration, a new global user option is now available to the rescue: Options.../Other/Base font size (default is no-op). - Knobs: graphic styles are now QStyle derived classes, which are assigned to the knobs using QWidget::setStyle(). Three styles are implemented in this way, supporting also the legacy QDial: * Our former look, tweaked and ported from Sonic Visualizer. * A port of the new look implemented by David Garcia. * Another ported widget style, designed by Giuseppe Cigala. - Spanish translation added. - Attempt to load Qt's own translation support and get rid of the ever warning startup message, unless built in debug moderr; also introducing the very first and complete German translation (patching transaction by Guido Scholz, thanks). - Messages file logging makes its first long overdue appearance, with user configurable settings in Options/Logging. - Only one application instance is now allowed to be up and running, with immediate but graceful termination upon startup iif an already running instance is detected, which will see its main widget shown up and all engines started automatically (Qt/X11 platform only).</li> Notes about the Windows(TM) package: (http://downloads.sourceforge.net/qsynth/qsynth-0.3.3-setup.exe) * It is a bundle of Fluidsynth 1.0.8 (patched) and QSynth 0.3.3, compiled in Windows with MinGW 3.4.2 and Qt 4.4.0. The package includes all the required libraries except DirectX-9, which should be installed before. The setup program itself was created with NSIS 2.37 (http://nsis.sf.net) * The patch for Fluidsynth (attached) was needed to allow QSynth to specify the name of a MIDI port to be opened other than the first one. The patch was sent to the Fluid-dev mailing list, but maybe we could offer it also in the QSynth web site? Link to the mailing list message: http://www.mail-archive.com/fluid-dev@nongnu.org/msg00816.html * Users should not expect the same functionality level in Windows compared to the Linux version. In windows it is not possible to connect the MIDI out from one program to the MIDI input of another application. QSynth/Fluidsynth needs to read MIDI events from a real MIDI device, as a keyboard. For something similar to the ALSA sequencer routing capabilities, you can try MIDIOX/MIDIYoke (http://midiox.com) Cheers && Enjoy -- rncbc aka Rui Nuno Capela

17 years, 3 months

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Linux-audio-dev