Linux-audio-user August 2005

linux-audio-user@lists.linuxaudio.org

169 participants
209 discussions

[linux-audio-user] [ANN] Snd-ls V0.9.5.3 and Mammut V0.21

by Kjetil Svalastog Matheussen

http://www.notam02.no/arkiv/src/ http://www.notam02.no/arkiv/src/snd/ Snd-ls ****** Snd-ls is a distribution of the sound editor 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. 0.9.5.1 -> 0.9.5.3 ------------------ -Reduced the startup-time radically. -Reduced memory usage. -Realtime priority when playing when using jack. -Fixed window auto-sizing. -Turned off off-turning of mlockall(MCL_FUTURE) to avoid being zombified from jack. -Fixed some things in rt-compiler.scm and snd_conffile.scm Mammut ****** Mammut will FFT your sound in one single gigantic analysis (no windows). These spectral data, where the development in time is incorporated in mysterious ways, may then be transformed by different algorithms prior to resynthesis. An interesting aspect of Mammut is its completely non-intuitive sound transformation approach. 0.20 -> 0.21 ------------ -Set realtime priority for the player thread to ensure clickless playing. -Fixed some trouble when exiting. --

18 years, 8 months

[linux-audio-user] CD-Text confusion

by Mike Jewell

Hi LAUs, I've been trying to understand how to get my burned audio CDs to have the "Artist", "Album" and "Song" titles show up in my CD Player. If I put a commercial CD in my drive it does, indeed, show the artist name, album title and track names in "CD Player". I'm running Fedora Core 3 (CCRMA) and have a ASUS CRW-5232AS CD Burner. I'm using XCDROAST to burn my CDs and it does a fine job burning. In xcdroast, I enter the CD Text I want and pick Disk-At-Once (DAO) mode and the CD gets burned fine but the CD TEXT apparently does not get written. Does my burner not support this? It is an inexpensive burner but the specs on ASUS's site say it supports the following "Disk Formats": CD-DA, CD-ROM, CD-ROM/XA, Photo CD, Mixed Mode CD-ROM, CD-I, CD-Extra, CD-Text, Video CD, DVCD, Bootable CD Any help understanding this issue would sure be appreciated. Thanks, Mike Mike Jewell One-Up Audio

18 years, 8 months

Re: [linux-audio-user] Re: Resampling Audio Libraries & Sinc

by davidrclark＠earthlink.net

Paul Davis, Before sounding off like you did, I suggest you *do your homework*. Regards, Dave.

18 years, 8 months

Re: [linux-audio-user] Re: Resampling Audio Libraries & Sinc Resamplers

by davidrclark＠earthlink.net

Part 3 of (probably) 3 If you still don't accept the inadequacies of sinc resamplers for bulk conversions at fixed rates, try this: Download the file abstraction-1_for_piano.ogg which was posted a while ago. (I chose it because it's not that big and isn't my file.) Use oggdec to change it into a WAV file: $ oggdec abstraction-1_for_piano.ogg -o abstraction-1_for_piano.wav OggDec 1.0 Decoding "abstraction-1_for_piano.ogg" to "abstraction- 1_for_piano.wav" [100.0%] Resample it at the *same rate* which should ideally give you the same thing back --- a very complicated "cp" or copy command: $ file abstraction-1_for_piano.wav abstraction-1_for_piano.wav: RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, stereo 44100 Hz $ sndfile-resample -to 44100 abstraction-1_for_piano.wav abstraction- 1_for_piano_sndfile.wav Input File : abstraction-1_for_piano.wav Sample Rate : 44100 Input Frames : 6288384 SRC Ratio : 1.000000 Converter : Best Sinc Interpolator <<< Best! Output file : abstraction-1_for_piano_sndfile.wav Sample Rate : 44100 Now diff them: $ diff abstraction-1_for_piano.wav abstraction-1_for_piano_sndfile.wav Binary files abstraction-1_for_piano.wav and abstraction- 1_for_piano_sndfile.wav differ OUCH!! This file, a very gentle audio file, has been corrupted by sndfile- resample at its optimum setting, assuming I invoked it correctly. Audio files which are not so gentle will produce even worse results. With the very little cursory examination I've done on sndfile-resample, I've already measured up to 2.5% errors in resampling to the *same rate*. That's huge. Something that should be at -90 db or so at 16 bit resolution could be at -30 db --- who knows what that might cause with further processing. Ideally, you should get back exactly the same thing. Here is what should have happened: $ resample_simple abstraction-1_for_piano.wav 44100 16 abstraction- 1_for_piano_fft.wav 1.0 1.0 1.0 Using pad size: 176400 $ diff abstraction-1_for_piano.wav abstraction-1_for_piano_fft.wav $ This is not by mere trickery; resampling was done. (The program did not simply check the original and target sampling rates, then quit, but instead spent about 20 seconds processing on my machine in double precision.) ------------------------ When reading about sinc resamplers, you may see some statements about why a file won't be the same if you resample it to the same rate. These statements, none of which appear individually to be false, as a whole misrepresent what can actually be achieved and misrepresent the true origin of inaccuracy, namely the method itself as it is implemented. For bulk conversions to constant rates, sinc resamplers will necessarily be either slow, inaccurate, or both of these because of the way the method works. ------------------------ ********************************************************************* To be very clear : This is NOT about comparing particular programs (specifically, I am not claiming that anything I wrote is of production quality), nor is it about ideal theoretical conditions; this is about comparing implemented methods and about the widespread misuse of Smith's algorithm in Linux audio, and probably elsewhere as well. It is a special-purpose algorithm that is very localized in the time domain. ********************************************************************* This is also about being skeptical. In audio, it pays to be skeptical, even in Linux audio where all the source code is available. A lot of the code is defective, packaged in a way to allow you to install it without problems. (In other words, the installation procedure works great, but the actual application is not really useful or misapplied, etc., my stuff included.) Last, but not least, there is an object lesson here in "rolling your own" rather than expecting other people to do it.

18 years, 8 months

[linux-audio-user] specimen loop editor with stereo samples

by Hector Centeno

hi, I'm just starting to use specimen and I find that it could be the answer to my search for a useful sampler in Linux. I was trying to edit the loop points in a stereo sample and because the loop editor only shows the left channel is it almost impossible to find the right points at both channels (zero crossing points). I don't know if I'm missing a feature or if maybe this would be a request: to be able to see both channels at the same time in the loop editor or at least to have a way for switching the view. thanks! hector

18 years, 8 months

[linux-audio-user] chkconfig command

by Dirk Ouellette

Why,on my RH9 ccrma, can I not use the chkconfig command. Its doesn't appear on my system I guess. chaz May I suggest # /sbin/chkconfig or /usr/bin/chkconfig. "/sbin/chkconfig alsasound on" worked for me in FC3

18 years, 8 months

[linux-audio-user] 100 % OPen source Music

by Bob

Hi Try this Link. All done in ardour and Jamin. http://www.soundclick.com/bands/pagemusic.cfm?bandID=390090 Try the Ballad Hold back the Tide Cheers Bob

18 years, 8 months

[linux-audio-user] mono synth, note allocation scheme

by Atte André Jensen

Hi I find that most soft synths (supercollider, pd, ams, zynaddsubfx, amsynth, om) unser linux work in a "wrong" or at least unintuitive and non-standard way. I'm wondering if a) it's something wrong with my setup/keyboards or a general problem, b) if nobody else feels this is an issue and c) if we should lobby the developers to change this behaviour. The problem is in monomode. If one note is held and another played, released, played, releaset, etc. there should always be sound as long as at least one note is depressed. Here's a graphical description of what I'm trying to say: http://www.atte.dk/mono_synth.pdf Any thoughts? -- peace, love & harmony Atte http://www.atte.dk

18 years, 8 months

[linux-audio-user] sWONDER update and news

by Marije Baalman

Hi all, after quite some time, I now released a new version of WONDER, version 2.0.8. This version features the GUI updates that were announced at the LAD this year, as well as a lot of restructuring in the code behind, making the framework more robust (less crashes!), and more easily extendible. For example, it should be much easier now to create a text based interface to WONDER. However, one little bug, which I still have to work on in the score creation of the composition tool, kind of renders that part of the program not very useful right now, but I didn't want to wait for another month with this release (I'll be away for the next couple of weeks)... Grid definition and playing should work fine. Details in the NEWS and KNOWNBUGS files in the tarball. I made a separate package for the manual/help files, as these update less often, and are quite big. Furthermore, there is now a CVS version at sourceforge as well, and I created a mailinglist there for those who wish to get updates on WONDER, and as a forum for questions about using WONDER in general, and bug-reporting. As this list gets archived, this might save me from answering some questions more than once :) Subscription at: http://lists.sourceforge.net/lists/listinfo/swonder-list More information: http://gigant.kgw.tu-berlin.de/~baalman/ Download from: https://sourceforge.net/projects/swonder/ Yours sincerely, Marije Baalman

18 years, 8 months

[linux-audio-user] kernel 2.6.12 and hotplugging

by conrad berhörster

Hello yesterday i updated my suse 9.3 system with the "new" kernel 2.6.12 from scratch with copying the .config file with zcat /proc/config.gz > .config now, there is no hotpluggung via usb neither pcmcia . On the old system, evrythink worked perfect. On the USB side, there are no control light shining, while booting or system running. Do i miss a script ?? ahhh system : fujutsu siemens lifebook e series any hints are welcome c~

18 years, 8 months

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Linux-audio-user August 2005