Linux-audio-dev

linux-audio-dev@lists.linuxaudio.org

7516 discussions

by arisstotle.52613058＠bloglines.com

--- joq(a)io.com wrote: On 7/20/07, Paul Davis <paul(a)linuxaudiosystems.com> wrote: > > On Fri, 2007-07-20 at 15:31 +0000, arisstotle.52613058(a)bloglines.com > > wrote: > > > I've been working with the 2.6 series kernel now for some time with satisfactory > > > results ie (about 24 msec of latency and solid stability). I chose the 2.6 > > > series because its the latest, and I wouldn't have to patch as much to get > > > support for my hardware (firewire alsa realtime etc...). But I've been reading > > > more and more about how the 2.4 kernels can outperform 2.6 when patched properly, > > > any truth to this? > > > > no truth. its an old data point, no longer valid. that is, assuming we > > are talking about RT-patched 2.6 vs. RT-patched 2.4. if you mean vanilla > > 2.6 vs. RT-patched 2.4, the latter is still better. > > I'm not sure that is even true any more. No recent data, but I tested jackd > extensively in about the 2.6.7 to 2.6.11 time-frame, and found those vanilla > 2.6 kernels quite competitive with RT-patched 2.4 ones, at least on the > machines I was running at the time (all uniprocessors). > > The very early 2.6.x kernels were another story. :-) > -- > joq > _______________________________________________ > Linux-audio-dev mailing list > Linux-audio-dev(a)lists.linuxaudio.org > http://lists.linuxaudio.org/mailman/listinfo.cgi/linux-audio-dev > when you all say RT Patched you mean realtime module built, loaded configured and used by jack correct?

18 years, 3 months

APIC, IRQ's, and realtime

by arisstotle.52613058＠bloglines.com

I've been trying to get a kernel built that will run smoothly, but this is the problem I keep running into, I compile the kernel with SMP processor support, because my processor is a dual core (duh right?) but as some may know, this automatically builds in APIC support. This then leads to unruly IRQ assignments, in my case, a quick cat /proc/interrupts will almost allways show my soundcard being shared with a usb port. of of course, to tease me even more, no assignment on irq 5, i've tried the whole hop-scotch game with the pci slots, nothing works. Help? -Thanks again

18 years, 3 months

FULL audio-signal path

by Andrew Gaydenko

Hi, All! Say, we have such audio-chain: 1. analogue source (say, mic-amp), 2. sound card's line input (let sound card be rme hdsp9632), 3. JackRack (or some other JACKified LADSPA host) with the only LADSPA plugin, let last one be a simple aplifier, 4.1. sound card SPDIF output. 4.2. sound card analogue output, OK, ALSA-driver, HdspMixer, JACK-server and something else are somewhere inside this "user' POV" list. The questions are: - what is full strict list of "audio-entities" steps in such roughly-presented chain? - which formats (float/integer, bitdepth) are used on each step? - which format convertions between steps may be treated as lossless and whcih as "lossness"? And more generally: are there common rules for keeping sound quality intact? I mean only format-related probable issues rather hardware issues like jitter and such. Andrew

18 years, 3 months

2.4 vs 2.6

by arisstotle.52613058＠bloglines.com

I've been working with the 2.6 series kernel now for some time with satisfactory results ie (about 24 msec of latency and solid stability). I chose the 2.6 series because its the latest, and I wouldn't have to patch as much to get support for my hardware (firewire alsa realtime etc...). But I've been reading more and more about how the 2.4 kernels can outperform 2.6 when patched properly, any truth to this?

18 years, 3 months

comments on (sparse) matrix libraries

by Georg Holzmann

Hallo list! I am searching for a sparse matrix library (prefered for C++, otherwise C) for an audio project. However, I found really many libraries and am a little bit confused which one I should take - so I wanted to ask here if someone can give me comments/suggestions to libraries they use ? Many thanks for any comment, LG Georg

18 years, 3 months

[ANN] QjackCtl 0.3.1a (unstable-qt4) crash-fix released!

by Rui Nuno Capela

Hi again, QjackCtl 0.3.1a (unstable-qt4) crash-fix released! This is an emergency crash-fix release and everyone is envited to ditch yesterdays one. The change-log just says it all: - An immediate showstopper crash upon client start was irradicated, which was affecting those with the system-tray icon disabled, as is the default (thanks to Ken Ellinwood for first reporting this sloppy one). Again, the fix source tarball is made available from: http://qjackctl.sourceforge.net http://sourceforge.net/projects/qjackctl Cheers && Enjoy, -- rncbc aka Rui Nuno Capela rncbc(a)rncbc.org

18 years, 3 months

audio conversion functions

by Craig Hoedebeck

I am relatively new to audio programming, but I have a task that requires converting between various audio formats: unsigned 16 bit linear to signed 16 bit linear u_law to signed 16 bit linear a_law to signed 16 bit linear unsigned 8 bit linear to signed 16 bit signed 8 bit linear to signed 16 bit Anyone know what the conversion functions for these would look like? Or even what a good reference is where I can find these? I have been googling around for about an hour and I have come up empty. ____________________________________________________________________________________ Be a better Globetrotter. Get better travel answers from someone who knows. Yahoo! Answers - Check it out. http://answers.yahoo.com/dir/?link=list&sid=396545469

18 years, 3 months

[ANN] QjackCtl 0.3.1 (unstable-qt4) is out!

by Rui Nuno Capela

Greetings y'all, Just one week after a no-regrets migration, here comes this second iteration over the Qt4 framework for the JACK Audio Connection Kit "cutie" GUI front-end that everybody loves or at least ought to :) QjackCtl 0.3.1 (unstable-qt4) is out! The main feature on this release, besides for the bug-fixes, is that it's the very first time ever QjackCtl is made available to build and run on all major desktop platforms: X11/Linux, Windows and Mac OS X. Yes you read it right, Windows, and it is thought to behave consistently on all those. One just have to take advantage from the Qt4 open-source edition and license which in fact is the same as QjackCtl's: GPL2. Yes, there's no turning back. QjackCtl is definitely a Qt4 application, this release marking the departure from the old, aged Qt3 code base, despite this one being tagged as "stable-qt3" anyway. The current branch has "unstable-qt4" on its middle name still, but not for long ;) Being a so-called shallowed bug-fix release, the change-log says some thingies that were shoved out, and nothing about the ones that still are creepin': - The current DSP load percentage activity is now also displayed on the system-tray icon tooltip. - An illusive but nasty Connections/Patchbay item tooltip crash bug has been hopefully fixed (Qt >= 4.3). - Now using QSystemTrayIcon class facility if available (Qt4 >= 4.2) making the system-tray option available on most platforms, notably on Windows and Mac OS X (EXPERIMENTAL). - Usage of QProcess class has been severely refactored, now using QProcess::start() instead of QProcess::startDetached(), giving much tighter control over the started jackd(mp) process. Downside is that QjackCtl lost its ability and option to leave the process detached upon quitting the application. Too bad. - A new eye-candy bit has sneaked in: server mode display, that is the RT indicator, now blinks when server/client is started/active. - Combo-box setup history has been corrected on restore, which was discarding the very initial default (factory) contents. - Now that Qt4 is accessible to open-source Windows appplications, there's some experimental stuff sneaking in for jackdmp support on win32 (http://www.grame.fr/~letz/jackdmp.html). - Connections list items were initially sorted in descending order by default. Fixed. Client items are now naturally sorted, again. As usual, the source tarball might be found here: http://qjackctl.sourceforge.net http://sourceforge.net/projects/qjackctl Cheers && Enjoy, -- rncbc aka Rui Nuno Capela rncbc(a)rncbc.org

18 years, 3 months

again [ot] programming c++ problem (functions adresses)

by Julien Claassen

Hi! Sorry to bother again. But I have the following problem I can't solve. I need to wrap some readline-code in my c++-class. Readline has some function-pointers you can set to a function you wrote yourself. So I did. The sinature of my function ALMOST matches that expected by readline, but it complains about the class part of my signature: my function: char** (Midish_rl::*)(const char*, int, int); Readline expects: char8* (*)(const char*, int, int); I tired writing a wrapper function, but for that I need some object, I just tried: char** wrapper(const char *text, int start, int end) { return my_ui.real_function(text,start,end); } The code is divided between a few files, so I couldn't just a a global object 'my_ui', which was known at all times. Does anyone have an idea how to solve it? Note: I don't want to use any external class-libraries, which might perform the task, because of dependencies. Anyway, there are no standard lib, that do that, not that I'm aware of at least. 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

18 years, 3 months

[ANN] Qsynth 0.3.1 (unstable-qt4) released!

by Rui Nuno Capela

Greetings, So after the great Qt4 migration, which was almost couple of weeks ago already, here comes the so-called shallowed bug-fix release of this "cutie" FluidSynth GUI: Qsynth 0.3.1 (unstable-qt4) has been released! As said, some bug-fixes have popped in and others are still hidden in the closet. Notable changes were: - Now using QSystemTrayIcon class facility if available (Qt4 >= 4.2) making the system-tray option available on most platforms, notably on Windows and Mac OS X (EXPERIMENTAL). - Combo-box setup history has been corrected on restore, which was discarding the very initial default (factory) contents. - One programming error has been corrected, which was affecting the editable preset combo-boxes usability. - Soundfont context menu is now available again even when the setup dialog soundfont list is empty. - About form link is now browseable externally. - Updated README-OSX (thanks to Ebrahim Mayat again). Grab it while it's hot: http://qsynth.sourceforge.net http://sourceforge.net/projects/qsynth Enjoy && Cheers, -- rncbc aka Rui Nuno Capela rncbc(a)rncbc.org

18 years, 3 months

Jump to page:

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

2003

2002

Linux-audio-dev