Linux-audio-user March 2007

linux-audio-user@lists.linuxaudio.org

183 participants
203 discussions

[linux-audio-user] ordering usb sound cards

by Eric Dantan Rzewnicki

I've read some of Christoph Eckert's posts from 2005 about passing index options to snd-usb-audio when it gets loaded, but I haven't been able to get it to work. There is a builtin mic with the non-functional camera that is apparantly on the usb bus, the internal SiS AC'97 device and sometimes an edirol ua-25. Any one of them can end up in any position. I've tried messing with options in modprobe.d, but haven't figured out how to make the cards stick to their card numbers on each boot. Anyone here have some pointers? It'll make the LAC streaming go much more smoothly if I don't have to hunt down which cardnumber is the edirol for the audio streams and which cardnumber is internal for monitoring. Thanks for any help, ERic Rz.

17 years, 2 months

[linux-audio-user] Alsamixer not storing levels...

by Mike Lyon

So while running Ubuntu Edgy, I bring up alsamixer as root to adjust my levels. I set them accordingly and then esc out. All is good, right? No. So I bring up alsamixer again as root and it defaulted back to it's original values. It won't save any of my values. What am I doing wrong here? Thanks, Mike

17 years, 2 months

[linux-audio-user] Re: writing a realtime app in python

by Kjetil Svalastog Matheussen

Eric Dantan Rzewnicki: > > On Mon, Mar 19, 2007 at 06:55:53PM -0500, Jack O'Quin wrote: > > On 3/19/07, Atte André Jensen <atte.jensen(a)gmail.com> wrote: > > You could code those parts of the program in C or C++ to avoid > > memory management in the "harder" realtime portions of your > > application. With sufficiently large ringbuffers (or the like), the > > other parts can probably be written in python with some higher > > latency. Well, Python is not so bad for realtime use, since the garbage collector is referencial. Its not optimal or realtime safe in any way, but in practice it works a lot better than other languages. > > An option to consider is controlling ecasound from python. I've had a > good deal of fun building things this way in the past and hope to get > back to it this year. > > It works fairly well. The logic and configuration of your program is > fine in python ... it just sends control information to ecasound while > ecasound handles all the details of communicating with jackd. > Other python alternatives are RTcmix: http://music.columbia.edu/cmc/RTcmix/use/python.html Or SuperCollider: (Couldn't find link, but I think I remember hearing about some stuff somewhere) Or PD: http://grrrr.org/ext/py/ I'm sure there are other ways too. CSound for example.

17 years, 2 months

[linux-audio-user] writing a realtime app in python

by Atte André Jensen

Hi I just installed csound5 with the python bindings, and now I'm eager to explore the possibilities with audio/python. I've done a fair amount of python programming, but so far my experiences with audio has been with PySeq (which I found pretty straight-forward). I hope someone here can answer a few initial questions: 1) How do I spawn a thread that has realtime priorities (like with "chrt -f -v 70 csound some.csd")? 2) I'd like to have several csnd's running, each in its own thread, but "collecting" the audio produced into one stream that should be output'able to both alsa and jack (obviously not at the same time, so maybe "either/or would be more descriptive). Is that possible and which python library should I look into? 3) I need to "investigate" a bit from my python app. Stuff like finding out which alsa midi clients are available, weather jack is running, etc. How is that done? 4) I also need to filter out stuff from the midi stream in order to send certain midi events to different csnd threads. I did this already with PySeq, but in light of what else I want to do, is there another alternative I should look into? 5) Besides *only* runnining the csnd instances in seperate rt threads, are there other things I need to be aware of or avoid for the application to perform well under jack and/or alsa? Also considering I'm gonna make it gui driven (been looking at WxWidgets, and although I'm totally new to gui programming it looks nice). Answers and/or pointers to relevant online info is greatly appreciated, thanks in advance! -- peace, love & harmony Atte http://www.atte.dk | quintet: http://www.anagrammer.dk | compositions: http://www.atte.dk/compositions

17 years, 2 months

Re: [linux-audio-user] Extracting/Ripping tracks from DVD-Audio discs

by D. Sen

So, it turns out that tcextract extracts the 5.1 channel AC3 file (when used with -a 0). If I use -a [1/2/3/etc], I get a 0 size file. When I use tcdecode on the AC3 file, it downmixes to two channels and produces a stereo file. However, I can use the -s [c,f,r] to weight mixing of the centre, front and rear to extract 3 different stereo files....(running tcdecode 3 different times with 3 different weights of [1,0,0], [0,1,0] and [0,0,1]. Its something I can use for now. It would be nice to be able to extract the DTS channels - tcdecode does not decode DTS. Thanks for your help, D Robin Gareus wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > > D. Sen wrote: >> The problem with all of these applications is that they downmix the >> audio down to stereo when storing to a wav file. > > are you sure about that? - `man tcdecode` says in line 48: > > - -A flag > > audio flag for AC3/A52 decoder [none]. This flag determines the > down-mixing configuration. Valid choices for flag are determined by the > following bits set: > drc off 1 > demux 2 > dolby off 4 > > Add those numbers to turn multiple options on. > > maybe you want tcextract (not decode the audio) ? > from `man tcextract`: > > The command tcextract -i foo.avi -x mp3 -a 3 extracts MPEG audio track 3 > from the AVI-file foo.avi and prints the bitstream to stdout. > >> Do you know if the tccat/tcdecode/tcextract command will save the >> individual tracks (interleaved or otherwise)? > > interleaved, but it depends on the codec or how many audio tracks you > select.. > > cheers, > robin > > PS. please don't top-post! > >> Thanks, >> >> Robin Gareus wrote: >>> D. Sen wrote: >>>> Robin Gareus wrote: >>>>> D. Sen wrote: >>>>>> Anyone know of a way to extract the multichannel audio from a >>>>>> DVD-Audio >>>>>> disc? Xine plays the multichannel files - so I assume there has to >>>>>> be a >>>>>> way to extract them... >>>>>> >>>>> there's `tcdemux` and `tcdecode` from the transcode package >>>>> - dvdrip provides is a GUI. >>>>> >>>>> (you can copy/paste dvdrip's LOG window for the commands it uses to do >>>>> the job. You only want the first part of the pipe: tcdemux | >>>>> tcdecode..) >>>>> >>>>> >>>> dvdrip refuses to work on my distribution. >>> mmh then there's the chance that tcdemux & tcdecode won't work either. - >>> usually you get those as dependency to dvd::rip. - see. >>> http://www.theorie.physik.uni-goettingen.de/~ostreich/transcode >>> >>> I'm sure that you can also use mplayer/mencoder or some ffmpeg command >>> line to do the same job.. gstreamer too.. >>> >>>> Is there a chance you could >>>> tell me what the tcdemux | tcdecode scripts would be to extract the >>>> audio? >>> sorry, I did not have my dvd drive with me.. now I do. >>> >>> how are your command line skills? dvd::rip does a lot of fancy piping ( >>> `man tee` -> man dvdrip-multitee ? :) ) - the command that does ripping >>> & demux is several pages long (includes 100 subtitle commands)... >>> >>> It boils down to sth like this: >>> >>> tccat -t dvd -T 1,-1,1 -i \/dev\/scsi\/host8\/bus0\/target0\/lun0\/cd | >>> tcextract -a 0 -x ac3 -t vob | tcdecode -x ac3 | tcscan -x pcm >>> >>> adjust the device to match your DVD-ROM. and replace the last step " | >>> tcscan -x pcm" with " > ripped-audio.pcm" to write the audio into a >>> file; or use " | tee ripped-audio.pcm | tcscan -x pcm" to write to a >>> file and scan for peak values.. >>> >>> use sox or rezound or ... to convert the pcm into your favorite format! >>> >>> good luck, >>> robin >>> >>> > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.6 (GNU/Linux) > > iD8DBQFF/ymleVUk8U+VK0IRAv/oAJ9Up2Mx/7QhwJzgbVwwuQb9dVWCnwCgu4bt > +2q8W6C45eWk3Exsxx2fkc4= > =gTLP > -----END PGP SIGNATURE----- > >

17 years, 2 months

Re: [linux-audio-user] Extracting/Ripping tracks from DVD-Audio discs

by Robin Gareus

D. Sen wrote: > Robin Gareus wrote: >> >> D. Sen wrote: >>> Anyone know of a way to extract the multichannel audio from a DVD-Audio >>> disc? Xine plays the multichannel files - so I assume there has to be a >>> way to extract them... >>> >> >> there's `tcdemux` and `tcdecode` from the transcode package >> - dvdrip provides is a GUI. >> >> (you can copy/paste dvdrip's LOG window for the commands it uses to do >> the job. You only want the first part of the pipe: tcdemux | tcdecode..) >> >> > dvdrip refuses to work on my distribution. mmh then there's the chance that tcdemux & tcdecode won't work either. - usually you get those as dependency to dvd::rip. - see. http://www.theorie.physik.uni-goettingen.de/~ostreich/transcode I'm sure that you can also use mplayer/mencoder or some ffmpeg command line to do the same job.. gstreamer too.. > Is there a chance you could > tell me what the tcdemux | tcdecode scripts would be to extract the audio? sorry, I did not have my dvd drive with me.. now I do. how are your command line skills? dvd::rip does a lot of fancy piping ( `man tee` -> man dvdrip-multitee ? :) ) - the command that does ripping & demux is several pages long (includes 100 subtitle commands)... It boils down to sth like this: tccat -t dvd -T 1,-1,1 -i \/dev\/scsi\/host8\/bus0\/target0\/lun0\/cd | tcextract -a 0 -x ac3 -t vob | tcdecode -x ac3 | tcscan -x pcm adjust the device to match your DVD-ROM. and replace the last step " | tcscan -x pcm" with " > ripped-audio.pcm" to write the audio into a file; or use " | tee ripped-audio.pcm | tcscan -x pcm" to write to a file and scan for peak values.. use sox or rezound or ... to convert the pcm into your favorite format! good luck, robin

17 years, 2 months

[linux-audio-user] Extracting tracks from DVDs

by ram

On Debian based Linux distributions, e.g. Debian Sarge, Fervent-STG, and so forth, I find the following two command line programs very useful for extracting and manipulating DVD contents: dvdbackup (to get the info on the hard drive) ffmpeg (for audio and/or video transcoding/format conversion) They are usually supplied with the distribution itself. You may need to add deCSS depending on your region. Otherwise the dependency issues are not too bad, unlike dvd::rip The manual (man) pages are also reasonably complete and clear. Good luck, A Nonny Mous > 4. Re: Extracting/Ripping tracks from DVD-Audio discs (D. Sen) > > Message: 4 > Date: Tue, 20 Mar 2007 09:56:12 +1100 > From: "D. Sen" <dsen(a)homemail.com> > Subject: Re: [linux-audio-user] Extracting/Ripping tracks from > DVD-Audio discs > To: Robin Gareus <robin(a)gareus.org> > Cc: A list for linux audio users <linux-audio-user(a)music.columbia.edu> > Message-ID: <45FF150C.5090106(a)homemail.com> > Content-Type: text/plain; charset=UTF-8; format=flowed > > The problem with all of these applications is that they downmix the > audio down to stereo when storing to a wav file. > > Do you know if the tccat/tcdecode/tcextract command will save the > individual tracks (interleaved or otherwise)? > > Thanks, > > Robin Gareus wrote: > > D. Sen wrote: > >> Robin Gareus wrote: > >>> D. Sen wrote: > >>>> Anyone know of a way to extract the multichannel audio from a DVD-Audio > >>>> disc? Xine plays the multichannel files - so I assume there has to be a > >>>> way to extract them... > >>>> > >>> there's `tcdemux` and `tcdecode` from the transcode package > >>> - dvdrip provides is a GUI. > >>> > >>> (you can copy/paste dvdrip's LOG window for the commands it uses to do > >>> the job. You only want the first part of the pipe: tcdemux | tcdecode..) > >>> > >>> > > > >> dvdrip refuses to work on my distribution. > > > > mmh then there's the chance that tcdemux & tcdecode won't work either. - > > usually you get those as dependency to dvd::rip. - see. > > http://www.theorie.physik.uni-goettingen.de/~ostreich/transcode > > > > I'm sure that you can also use mplayer/mencoder or some ffmpeg command > > line to do the same job.. gstreamer too.. > > > >> Is there a chance you could > >> tell me what the tcdemux | tcdecode scripts would be to extract the audio? > > > > sorry, I did not have my dvd drive with me.. now I do. > > > > how are your command line skills? dvd::rip does a lot of fancy piping ( > > `man tee` -> man dvdrip-multitee ? :) ) - the command that does ripping > > & demux is several pages long (includes 100 subtitle commands)... > > > > It boils down to sth like this: > > > > tccat -t dvd -T 1,-1,1 -i \/dev\/scsi\/host8\/bus0\/target0\/lun0\/cd | > > tcextract -a 0 -x ac3 -t vob | tcdecode -x ac3 | tcscan -x pcm > > > > adjust the device to match your DVD-ROM. and replace the last step " | > > tcscan -x pcm" with " > ripped-audio.pcm" to write the audio into a > > file; or use " | tee ripped-audio.pcm | tcscan -x pcm" to write to a > > file and scan for peak values.. > > > > use sox or rezound or ... to convert the pcm into your favorite format! > > > > good luck, > > robin > > >

17 years, 2 months

[linux-audio-user] USB Audio Interfaces

by Jim Steed

I am running Fedora Core 5 on the Playstation 3 (PPC build, kernel 2.6.16). I'd like to do some audio processing on it using 4 microphone channels. The channels have to be synchronous and all I have is USB 2.0 inputs, so I've been looking at USB audio interfaces. Does anyone have a recommendation that will work with no/few hassles on FC5 PPC 2.6.16? Here are 3 I've looked at * M-Audio Quattro (used on EBay) * M-Audio Torq/Conectiv * Roland/Edirol US-101 Thanks, Jim Steed

17 years, 2 months

[linux-audio-user] [ANN] GMIDImonitor 3.1 released

by Nedko Arnaudov

GMIDImonitor is GTK+ application that shows MIDI events. New in this release: * Fix build against old jackmidi (0.102.20) * Fix bug (not showing channel for note off messages) Project site: https://gmidimonitor.bountysource.com/ Screenshot: https://gmidimonitor.bountysource.com/FileDownload?file_id=50&inline=yes Source tarball can be downloaded from project site, "Downloads" section -- Nedko Arnaudov <GnuPG KeyID: DE1716B0>

17 years, 2 months

[linux-audio-user] Wiki for Linux Sound & MIDI Software

by Robin Gareus

With ongoing preparation to "Integrate End User and Developer Resources at linuxaudio.org" (workshop @ LAC2007) we are proud to announce a first version of Dave's linux-sound application index as public-wiki: http://apps.linuxaudio.org/ this is by far no cute end-user resource portal yet, but a first step in merging data and setting up a prototype back-end! We are looking for interested people to contribute at various levels and suggest to use the mailing list for general discussion while keeping dokuwiki and style related requests at http://apps.linuxaudio.org/wiki:open_discussion Further [major] back-end development on http://apps.linuxaudio.org/ will probably not happen until LAC2007, but we are interested to tweak the look and feel, fix bugs, and collect feedback. We're also looking for qualified LAU's and LAD's to verify and maintain the current content with editor privileges, responsibilities and deeds. next up: docs.linuxaudio.org: - static documentation (docbook, LateX, [x]html) - slides and presentations (PDF, ps, png jpg,..??) - music (collaborate with or outsource to freesound et al.) - include (external?) video presentations, movies, etc - source code (coding examples: wiki-page; svn-mirror/server ??) for each hosted documentation there will be an option for user annotation(s). eg. wiki-discussion page, blog-comments, email-notify[-mailing-list]? - some of it will be merged with apps.linuxaudio.org which will provide automatic indexing; details remain to be discussed. some of the intended supported formats imply moderation / maintained upload or installation of static documentation. - the ring of maintainers could evolve with key-signatures, and parts of the system may become completely open. - suggestions: http://apps-devel.linuxaudio.org/wiki:suggest_doc ico & robin

17 years, 2 months

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Linux-audio-user March 2007