Linux-audio-dev

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7516 discussions

[linux-audio-dev] OSS, Line in directly to Line out?

by Tobias Scharnberg

Hello List, this might really be a dumb question, but anyway: When I have an Audio-Source on Line-In or MIC, what do I have to do to directly output it to LineOut? Is it possible to directly put it through by using /dev/mixer ? Or do I have to record the Line-In audiostream in a buffer and then read from the buffer for output? At least duplex capability is given in my device! And: I really can't use ALSA for that device, which is a shame. Any hints or suggestions are highly welcome. Tobias

19 years, 7 months

[linux-audio-dev] OSS, Sound playback too fast

by Tobias Scharnberg

Hello list, before someone tells me to use ALSA - the AC97 codec on my Arm-Board does not work wit ALSA according to the distributor... so it seems I have to stick with OSS. I opened a 16 bit 44100 wav-file with libsndfile and wrote the PCM to a buffer. Then I configure the card with 16 bit NE, 44100 and with 5 fragments of the size of 2048 bytes. According to the readback values, all data was set by OSS. In my main loop I use SNDCTL_DSP_GETOSPACE to poll the buffer. Whenever it shows free fragments, I write more data to the card. What I experience is that playback is too fast. I can make it slower by reducing the buffer-size or by setting a very high usleep value so that all fragments practically stay free. There is a precompiled madplayer on the device and it plays perfectly... can someone give me a hint what went wrong? Thanks! Tobias

19 years, 7 months

[linux-audio-dev] Call for help for LinuxTag2006

by Arnold Krille

Hi all, as every year the famous german LinuxTag is taking place. This year in Wiesbaden from 3. to 6. May. Yes, this is just one week after LAC2006, which has several advantages and disadvantages: + It is a good chance to come to Germany for LAC, have one or two days of holiday and then join the LA-Group at LinuxTag! + Maybe even repeat your LAC-Talk at LinuxTag? (see www.linuxtag.org for details on the Call-for-Papers but be aware that it ends January 15...) + Wiesbaden is more in the center of germany so perhaps some LA-folks from the north of germany can join us? - The new place for LinuxTag together with LAC being a week before enforce two of the main-booth-members of the last years (Christoph Eckert and Frank Neumann) to be only a visitor at LinuxTag or even less... That leaves a hole in the organisational part. :-( So here is my call: I am willing to do some work organizing a booth and a group of staff but I need YOUR help! If you are a german LA[DU]-member and have some spare time, join in! A booth at LinuxTag is a good opportunity to present Linux Audio to the people, not only to developers but more to users. The crowd is mostly industry (producers, technicians, musicians) at the weekdays and home-recording-users at the weekend. Don't be afraid, there won't be much questions about setting up drivers for consumer-cards (and If there are, we usually send them to their distributions booth :-) ). But there will be a lot people thinking about using your app in studio! So you definitly don't want to miss this chance! If I get positive answers from at least two other people by weekend, I will apply for a booth and things start rolling, so don't hesitate, check your calendar, plan for another week of holiday and join me (us?). So long and thanks for all the fish, Arnold -- visit http://dillenburg.dyndns.org/~arnold/ --- Wenn man mit Raubkopien Bands wie Brosis oder Britney Spears wirklich verhindern könnte, würde ich mir noch heute einen Stapel Brenner und einen Sack Rohlinge kaufen.

19 years, 7 months

[linux-audio-dev] [ANN] netjack-0.8

by torbenh＠gmx.de

netjack-0.8 is released. netjack links jackds together via a network. build your linux-audio cluster. work on a remote ardour, or even 2 ardours at once. netjack is also great for jamming with a friend. - one period roundtrip latency. - transport sync supporting slow-sync clients. see: http://netjack.sourceforge.net -- torben Hohn http://galan.sourceforge.net -- The graphical Audio language

19 years, 7 months

[linux-audio-dev] flashing a rom

by Patrick Shirkey

Hi, I'm not sure about the title of this post but maybe someone here can point me in the right direction. First a little background: A friend and I are investing some time and money into a new project over the next few months. The aim is to custom build a hardware device for DJ's using linux software. The device will be similar to a hercules PC DJ or a pioneer mixing desk except it will have onboard usb slots for flash cards. It will be an all in one DJing console which we hope will make life easier for the increasing number of DJ''s who use mp3 or digital files directly from their computers. At the moment we have an old controller which we want to run some tests with. We also would like to modify it to have usb support. However it has a proprietry OS. My question is does anyone here have experience with flashing a rom and advice that might otherwise take me a few bad experiences to learn? Thanks in advance. -- Patrick Shirkey - Boost Hardware Ltd. Http://www.boosthardware.com Http://www.djcj.org/LAU/guide/ - The Linux Audio Users guide ======================================== Apparently upon the beginning of the barrage, the donkey broke discipline and panicked, toppling the cart. At that point, the rockets disconnected from the timer, leaving them strewn around the street. Tethered to the now toppled cart, the donkey was unable to escape before the arrival of U.S. troops. United Press International Rockets on donkeys hit major Baghdad sites By P. MITCHELL PROTHERO Published 11/21/2003 11:13 AM

19 years, 7 months

[linux-audio-dev] Letter to kernel developers?

by Lee Revell

Can someone please help me find a link to the open letter to kernel developers regarding horrible latency with kernel 2.6 that Paul Davis, Benno Sennoner and others posted to LKML in early 2004 (NOT the one from 2000) - the one that led Ingo to develop the voluntary preemption patches. I cannot find it with any amount of googling, and my local LKML archive only starts in July 2004. There was such a letter right? Am I crazy or just making this up? Lee

19 years, 7 months

[linux-audio-dev] liboggz 0.9.5 Release

by Conrad Parker

Oggz 0.9.5 Release ------------------ Oggz comprises liboggz and the command-line tools oggzinfo, oggzdump, oggzdiff, oggzmerge, oggzrip, oggz-scan and oggz-validate. liboggz is a C library providing a simple programming interface for reading and writing Ogg files and streams. Ogg is an interleaving data container developed by Monty at Xiph.Org, originally to support the Ogg Vorbis audio format. This release is available as a source tarball at: http://www.annodex.net/software/liboggz/download/liboggz-0.9.5.tar.gz New in this release: * Fixed and updated Windows (Visual Studio) support - added missing exported symbols, projects for oggz tools. (Alex Krumm-Heller, Silvia Pfeiffer) * Support for OggPCM (Draft 2, Main header) OggPCM is an experimental specification for storing uncompressed PCM audio in Ogg bitstreams. - liboggz: Recognition of OggPCM timestamps, and support for seeking in files that contain OggPCM logical bitstreams. - oggzinfo: Display OggPCM header details - oggzdump, oggzrip: New [--content-type pcm, -c pcm] option to filter on OggPCM - oggz-validate: Validate framing of OggPCM logical bitstreams This version is installed on http://validator.annodex.org/ for online validation of OggPCM files. For more information about OggPCM, see: http://wiki.xiph.org/index.php/OggPCM * ./configure support for large (>2GB) files This version adds build configuration support for large files, allowing liboggz to operate on files >2GB. This version does not introduce any API changes; interfaces such as oggz_tell() continue to use off_t externally. However, sequential reading and validation of large files is now possible. * bug fixes and cleanups: - oggz-validate, oggzmerge, oggzdump, oggz-scan, oggzinfo: handle unknown content types (Ian Malone) - remove deprecated oggzed example - various code and documentation build cleanups About Oggz ---------- Oggz comprises liboggz and the command-line tools oggzinfo, oggzdump, oggzdiff, oggzmerge, oggzrip, oggz-scan and oggz-validate. liboggz supports the flexibility afforded by the Ogg file format while presenting the following API niceties: * Full API documentation * Comprehensive test suite of read, write and seeking behavior. The entire test suite can be run under valgrind if available. * Developed and tested on GNU/Linux, Darwin/MacOSX, Win32 and Symbian OS. May work on other Unix-like systems via GNU autoconf. For Win32: nmake Makefiles, Visual Studio .NET 2003 solution files and Visual C++ 6.0 workspace files are provided in the source distribution. * Strict adherence to the formatting requirements of Ogg bitstreams, to ensure that only valid bitstreams are generated; writes can fail if you try to write illegally structured packets. * A simple, callback based open/read/close or open/write/close interface to raw Ogg files. * Writing automatically interleaves with packet queuing, and provides callback based notification when this queue is empty * A customisable seeking abstraction for seeking on multitrack Ogg data. Seeking works easily and reliably on multitrack and multi-codec streams, and can transparently parse Theora, Speex, Vorbis, FLAC, CMML and Ogg Skeleton headers without requiring linking to those libraries. This allows efficient use on servers and other devices that need to parse and seek within Ogg files, but do not need to do a full media decode. Full documentation of the liboggz API, customization and installation, and mux and demux examples can be read online at: http://www.annodex.net/software/liboggz/html/ Tools ----- The Oggz source tarball also contains the following command-line tools, which are useful for debugging and testing Ogg bitstreams: * oggzinfo: Display information about one or more Ogg files and their bitstreams. * oggzdump: Hexdump packets of an Ogg file, or revert an Ogg file from such a hexdump. * oggzdiff: Hexdump the packets of two Ogg files and output differences. * oggzmerge: Merge Ogg files together, interleaving pages in order of presentation time. * oggzrip: Extract one or more logical bitstreams from an Ogg file. * oggz-scan: Scan an Ogg file and output characteristic landmarks. * oggz-validate: Validate the Ogg framing of one or more files. License ------- Oggz is Free Software, available under a BSD style license. More information is available online at the Oggz homepage: http://www.annodex.net/software/liboggz/ enjoy :) -- Conrad Parker Senior Software Engineer, Continuous Media Web, CSIRO Australia http://www.annodex.net/ http://www.ict.csiro.au/cmweb/

19 years, 7 months

[linux-audio-dev] Old Specimen mockups

by Thorsten Wilms

Hi! Specimen might be dead or in keep-functioning-maintainance only, and work based on these mockups had been canceled before due to them being too time consuming to implement and doubts on extendability, anyway :( BUT, instead of them just bit-rotting on my hd, I rather present them here, since they could still be an inspiration to someone :) 1. Keys and Main: http://xs71.xs.to/pics/06102/specimen_18_keys_main_i.png 2. Mixer and Pitch: http://xs71.xs.to/pics/06102/specimen_18_mixer_pitch_i.png Like in the actual Specimen, all sliders are fan-sliders. (http://leute.uni-wuppertal.de/~ka0394/en/fan-sliders/index.html) On the left there are 16 MIDI channels down. The numbers also act as MIDI activity indicator (3 is receiving something). They're followed by volume slider, mono, solo and name. The selected channel (1) is connected to the Keys/Mixer area. This works a bit like tabs, but allows that section to come up from the sunken field, resulting in cleaner look. It's all meant to be GTK theming friendly. On the keys area, Patches are assigned to keyboard ranges. They can be put in columns to allow layering. The base note is marked (D here, could have made that more obvious). The selected Patch is shown in inverted colour. The Mixer area is a bit redundant as it is shown here. Initialy it was meant to not just allow access to panning over what the channels section on the left offers, but also Cut/Cut by (a more versatile, but not exactly self explaining system than exclusion groups, used for cutting off a open hi-hat on a closed one and similar things). Every selection of Parameters could be shown in that table, though. The right section shows the selected Patch. It was a goal to keep the Specimen window rather small to make using it with other apps more handable, so a number of tabs were needed. The not shown Volume, Panning, Cutoff and Resonance tabs would be much like the Pitch one. Contents of that tab should be pretty selfexplainatory, or it's no good anyway :) The 3 sections layout and the Keys area where all my own idea, but Pete Bessman's influence and decisons are all over the place. Cheers, Thorsten Wilms --- http://xs.to - Free Image Hosting

19 years, 7 months

[linux-audio-dev] Roland CG-8: another Linux product

by Artemiy Pavlov

Hey all, just noticed that Roland's CG-8 Visual Synthesizer (http://www.edirol.net/products/en/CG-8/) is yet another product based on Linux. You can get their sources at: http://www.roland.com/support/gpl/ - there in the first download you'll see ALSA and GTK sources. Now when will they release a Linux-based workstation that doesn't cost like OASYS? ;-) Artemiy.

19 years, 8 months

[linux-audio-dev] Writing PCM to left and right channel sperately?

by Tobias Scharnberg

Hello List, I'm new to audio programming and have problems finding the right solutions for the development I work on right now: I need to use the left and the right audio channel seperately. The device is an ARM based board with a AC97 soundchip. It seems to work with OSS so far and I did choose libsdnfile to open Soundfiles and get the PCM. As far as I learned the audio data is coded in one stream, one sample left, one sample right. Is there a way to separately fill the soundcard buffers with ALSA? The only solution I can think of right now is to recode the audio data to left only or right only and to use a library like esound to mix them together. Is this the right way to do such a thing? Any suggestions, pointers, hints are highly welcome. Greetings, Tobias

19 years, 8 months

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Linux-audio-dev