Linux-audio-dev

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7520 discussions

[linux-audio-dev] Re: [linux-audio-user] hydrogen crashes / extract waves from .mid-files of ddrum

by Lee Revell

On Mon, 2005-02-21 at 15:42 +0100, CC-Band wrote: > hi, > > i tried out the agnula demudi project. > > jack & hydrogen works fine but sometimes hydrogen crashes immediately. > what can i do to get information, why? I am having the exact same problem with Hydrogen. Most of the time it crashes immediately. If I start it repeatedly it will eventually succeed. I have found it's a lot more likely to segfault immediately on startup if JACK is run in verbose mode, and the crashes are more likely with lower latencies. 32 frames almost always crashes. 128 almost always succeeds. 64 is hit or miss. Lower latencies are less likely to crash on a faster machine. I have reproduced this across several versions of JACK and Hydrogen on multiple machines. I got a backtrace from gdb and this is where it crashes (from src/lib/Hydrogen.cpp): inline void audioEngine_process_clearAudioBuffers(uint32_t nFrames) { *---> memset( m_pMainBuffer_L, 0, nFrames * sizeof( float ) ); // clear main out Left memset( m_pMainBuffer_R, 0, nFrames * sizeof( float ) ); // clear main out Right As soon as it goes to clear the audio buffers, boom. As the problem is timing sensitive it's certainly a race condition. I cannot determine whether the bug is in JACK or hydrogen though. I have reported the problem on hydrogen-devel and got no response whatsoever. It's getting to be frustrating as the bug is 100% reproducible, but I can't even get the Hydrogen developers to ACK my bug report. Here is the backtrace. Lee (gdb) bt full #0 0xb759949b in memset (dstpp=0x0, c=0, len=512) at ../sysdeps/i386/memset.c:65 d0 = 128 dstp = 0 x = 0 #1 0x0807da0f in audioEngine_process_clearAudioBuffers (nFrames=128) at src/lib/Hydrogen.cpp:702 No locals. #2 0x08074381 in audioEngine_process (nframes=128, arg=0x0) at src/lib/Hydrogen.cpp:746 res = 0 startTimeval = {tv_sec = 1107297223, tv_usec = 403047} sendPatternChange = 183 res2 = -1218109252 renderTime_start = {tv_sec = -1217118338, tv_usec = -1208618368} i = 3086349340 pNote = (class Note *) 0x1 renderTime_end = {tv_sec = 91845001, tv_usec = -1084229004} ladspaTime_start = {tv_sec = 52302212, tv_usec = 0} ladspaTime_end = {tv_sec = -1208836712, tv_usec = 0} val_L = -0.87490797 val_R = 1.40129846e-45 fRenderTime = 0 fLadspaTime = 1.821688e-44 finishTimeval = {tv_sec = -1208834440, tv_usec = -1084229128} sampleRate = 1.17287768e-35 #3 0xb7f2e9f9 in jack_client_thread (arg=0x82f59d0) at client.c:1264 control = (volatile struct {...} *) 0xb73a3000 event = {type = GraphReordered, x = {n = 0, port_id = 0, self_id = 0}, y = {n = 1, ptid = 1, other_id = 1}} status = 0 '\0' c = 0 '\0' err = 0 #4 0xb773fe51 in pthread_start_thread (arg=0xbf5ffbe0) at manager.c:309 default_params = {__sched_priority = 0} request = {req_thread = 0x0, req_kind = REQ_CREATE, req_args = {create = {attr = 0x0, fn = 0, arg = 0x0, mask = {__val = { 0 <repeats 32 times>}}}, free = {thread_id = 0}, exit = {code = 0}, post = 0x0, for_each = {fn = 0, arg = 0x0}}} outcome = (void *) 0x0 #5 0xb75f96ea in clone () from /usr/lib/debug/libc.so.6 fstab_state = {fs_fp = 0x0, fs_buffer = 0x0, fs_mntres = {mnt_fsname = 0x0, mnt_dir = 0x0, mnt_type = 0x0, mnt_opts = 0x0, mnt_freq = 0, mnt_passno = 0}, fs_ret = {fs_spec = 0x0, fs_file = 0x0, fs_vfstype = 0x0, fs_mntops = 0x0, fs_type = 0x0, fs_freq = 0, fs_passno = 0}} __elf_set___libc_subfreeres_element_fstab_free__ = (const void *) 0xb762dce0

20 years, 9 months

[linux-audio-dev] University of Lueneburg audio workshop

by Florian Grote

Call for Participation When searching for the determinant factors of digital audio production, its forms and compositional strategies, mere technological criteria become less important in the light of the pervasion of information technology into audio media. "Computer als Klangmedien" (Computers as Sound Media), the topic of the 1993 Hyperkult III, have become omnipresent. Even the traditional domain of digital music, the "Computer Music" with its core elements, algorithmic composition and sound synthesis, can be found in a broad practice of digital production within mainstream pop music. Compositional as well as sound-aesthetical traditions of "Elektronische Musik" and "musique concrète" become base elements of a popular or less popular avantgarde that is positioned beyond historic dogmas. At the same time, artistic as well as scientific discourses discover electronic sound as a central area of present-time culture. Apparently, the abstract soundworlds of electronica do not only represent the digital lifestyle but also come to be the projection space of techno-cultural change. Phenomena of hybridism, as they were described in the 90s caused by the disbandment of familiar boundaries between technology, nature and culture , between plugged and unplugged and also between Art and Pop Music, now gain new actuality with the reintegration of analog sound synthesis, tube amplifiers, and manually operated instruments into the digital environment. On one hand, hybrid technology corresponds with a hybrid culture of merging established oppositions, however does it also often aim at creating fotorealistic simulations of its predecessors. Against this background, how are methods, contents, traditions and creative strategies changed? Which relations exist between digital audio media and auditive forms and processes? Do distribution and collaborative production in digital networks call for a new definition of the musically interested public? Which technological innovations will give direction to future practices? HyperKult 14 wants to debate these and other questions in an interdisciplinary dialogue and take the chance to reach an up-to-date positioning of digital audio media. Contributions from diverse scientific and artistic plateaus in the field of audio compression methods, sound synthesis, sampling, software-tools, Creative Commons, avantgarde-pop, sound art, sound culture, informatics, cultural and media sciences are welcome. The HyperKult will have an extended exhibition area with the topic communications . The goal is to advance the practice-related exchange between projects, organisations, labels, and musicians (etc.). Interested parties are hereby called upon to participate with presentations. A registration is obligatory due to limited space. Dates Please send 1-2 page abstracts of your contribution to the workshop HyperKult 14 (scientific lectures, technical or artistic demontrations) as well as registrations for communications -presentations (no fees) until March 31 2005 to: Universität Lüneburg Rechenzentrum HyperKult 21332 Lüneburg Germany mailto:hyperkult@uni-lueneburg.de Organizational committee Rolf Großmann Martin Schreiber Martin Warnke Program committee Rolf Großmann (Universität Lüneburg) Michael Harenberg (Hochschule der Künste Bern) Robert Henke (aka Monolake, Ableton, Berlin, angefragt) Jochen Koubek (Humboldt-Universität zu Berlin) Claus Pias (Ruhr-Universität Bochum) Martin Schreiber (Universität Lüneburg) Georg Christoph Tholen (Universität Basel) Georg Trogemann (Kunsthochschule für Medien Köln Martin Warnke (Universität Lüneburg) Section »Computer als Medium« In line with the HyperKult 14, the annual general meeting of the section will take place on July 16 2005. What is HyperKult? »HyperKult - Computer as Medium« takes place as an annual (non-profit and no-budget) symposium since 1990. Hyper(media)Kult(ur) was an at this time an upcoming field of research across the borderline of technical and cultural disciplines. HyperKult has broadened over the years to examine more general questions of the relationship between cultural, especially aesthetic development and information technology. HyperKult is organized by the department "Kulturinformatik" of the University of Lueneburg in Kooperation with researchers from Humboldt University Berlin and the University of Basel (Switzerland).

20 years, 9 months

[linux-audio-dev] Multichannel sound ?

by robinud＠volja.net

Hi! How does one use the extra channels on a six channel card ? I can only hear the 2 front speakers. I remember on a es1370 card, that I had an extra /dev/dsp1 for the rear speaker pair, but with an on board VIA audio there is only one /dev/dsp. I also tried playing a 6 channel sound file with sox, but still only the front speakers make sound. Any clues ? HW is VIA 8235 + Realtek ALC650 kernel 2.6.8-debian driver is OSS via82xxxx ( I'm willing to switch to ALSA, but a quick look says it is the same there ). Ideally I would want a second stereo /dev/dsp1, that would produce sound on the rear speakers. Thanks for any help, David ---------------------------------------------------------------- Varno. Enostavno. Vredno. Internet dodatne storitve. http://www.voljatel.si/storitve/

20 years, 9 months

[linux-audio-dev] addy change

by Dave Phillips

Greetings: My ancient bright.net address is finally closed, as of now. I'll receive no more email at that address (current addy is in this mail's header). If you've sent any mail to me over the past two days it's probably been lost: I inadvertently cleared my Inbox for the older account, so please resend if you've sent anything directly to me recently. All my bright.net pages will be revived at another location, I'll send a note to this list at that time to say where & when. Best, dp

20 years, 9 months

[linux-audio-dev] Linux DSP Hardware?

by jipi

Hi folks, currently, all signal processing algos are being done in software for Linux Audio. are there any hardware accelerated support for audio hardware when doing these sort of algos? what I mean is, graphics card manufacturers have hardware acceleration where the X servers can support those acceleration. do we have it in audio? for now, RME cards do not have DSPs in them yet. (as far as i know) they only have audio signal routings and high quality audio paths. what if we want to experiment with h/w dsp? (e.g. the 1820m from creative professional aka emu) jipi

20 years, 9 months

[linux-audio-dev] Re: [linux-audio-user] emu10k1 multichannel support

by Lee Revell

On Sun, 2005-01-30 at 20:21 -0500, Lee Revell wrote: > I posted a newer version. This connects the > external inputs to the multichannel capture device. The JACK capture > ports should correspond exactly to the default kX ASIO capture channels > (1,2 is Line/Mic, 9,10 is Line2/Mic2, etc), You can record from all > inputs at once, so with a LiveDrive you can record 4 or 6 analog inputs. > > http://www.alsa-project.org/~rlrevell/emu10k1-multichannel-v008.patch > I have posted the latest version: http://www.alsa-project.org/~rlrevell/emu10k1-multichannel-v009.patch - The multiple input capture feature described above was merged into ALSA CVS, so this is no longer included in the patch. If you only need the multichannel capture feature and not the playback, you can just use ALSA CVS. I can't be certain of the mappings from inputs to JACK ports on every possible card model, though it should be similar to the kX driver. If in doubt, you can use meterbridge to monitor all 16 capture channels. - Split the snd_emu10k1_trigger_voice function into prepare_voice and trigger_voice. This should improve the sync between multiple playback channels. This behavior was derived from the opensource.creative.com driver. These improvements to the emu10k1 driver were made possible by a donation from Mark Constable. If you find these patches useful, I accept donations via my PayPal account. Lee

20 years, 9 months

[linux-audio-dev] LAC 2005: Conference programme online, register now!

by Frank Neumann

Hi all, the conference programme of the International Linux Audio Conference 2005 (LAC2005) in Karlsruhe, Germany, on April 21st-24th, 2005, is now online at http://lac.zkm.de. Small changes are still possible, though. Also, registration (free) for the conference is now possible, too, at http://lac.zkm.de/registration.shtml Quote from that page: "Admission to this year's conference requires a registration. This helps us to estimate how many visitors we may expect, what individuals the audience is made of, and allows to produce name tags for all attendees so that it becomes easier to identify each other. The registration is free - and so is the conference (except for the concerts). The data you enter here is purely for our own informational purposes, and will never be given away or sold to anyone. If you register, no confirmation of any kind will be sent to you. You can even completely omit the E-Mail address, but providing it makes it easier for us to tell if there's a real human behind a registered identity or rather a robot/spambot." So, there you have it. Go ahead, read, register and come :-) Thanks for reading, The LAC05 organization team: Götz Dipper (ZKM) Frank Neumann

20 years, 9 months

[linux-audio-dev] forget rosegarden, muse, softwerk, seq24 ...

by Paul Davis

http://musicthing.blogspot.com/2005/02/hamster-powered-midi-sequencer.html

20 years, 9 months

[linux-audio-dev] [PATCH] jack.plumbing should not die

by Martin Habets

Sometimes jack fails to make a connection. jack.plumbing dies when this happens. Quite inconvenient as I usually don't notice for a while, have to figure out what happened and restart jack.plumbing. There is no reason for jack.plumbing to die because of this. It can try to connect again later, when hopefully it is allowed. Patch #1 attached fixes this issue. While I'm at it: I was getting sick and tired of seeing Rule file not modified: '/etc/jack.plumbing'. Rule file not modified: '/home/mhabets/.jack.plumbing'. all the time in my logging window. So patch #2 removes this info. It seems totally useless info to me anyway. Hopefully you find these usefull. Below is some before and after data. Thanks, Martin Habets --------------------------------------------------------------------------- Before: Rule file not modified: '/etc/jack.plumbing'. Rule file not modified: '/home/mhabets/.jack.plumbing'. Rule file not modified: '/etc/jack.plumbing'. Rule file not modified: '/home/mhabets/.jack.plumbing'. Rule file not modified: '/etc/jack.plumbing'. Rule file not modified: '/home/mhabets/.jack.plumbing'. Rule file not modified: '/etc/jack.plumbing'. Rule file not modified: '/home/mhabets/.jack.plumbing'. Connect: 'sooperlooper_1:loop0_out_1' -> 'alsa_pcm:playback_1'. cannot connect ports owned by inactive clients; "sooperlooper_1" is not active jack_connect() failed: 'sooperlooper_1:loop0_out_1' -> 'alsa_pcm:playback_1' jack.plumbing dies After: cannot connect ports owned by inactive clients; "jack_rack_5735" is not active cannot connect ports owned by inactive clients; "jack_rack_5735" is not active cannot connect ports owned by inactive clients; "jack_rack_5735" is not active Connect: 'jack_rack_5735:out_1' -> 'alsa_pcm:playback_1'. cannot connect ports owned by inactive clients; "jack_rack_5735" is not active jack_connect() failed: 'jack_rack_5735:out_1' -> 'alsa_pcm:playback_1' Connect: 'jack_rack_5735:out_2' -> 'alsa_pcm:playback_2'. cannot connect ports owned by inactive clients; "jack_rack_5735" is not active jack_connect() failed: 'jack_rack_5735:out_2' -> 'alsa_pcm:playback_2' **** alsa_pcm: xrun of at least 18.475 msecs **** alsa_pcm: xrun of at least 0.257 msecs Connect: 'jack_rack_5735:out_1' -> 'alsa_pcm:playback_1'. Connect: 'jack_rack_5735:out_2' -> 'alsa_pcm:playback_2'.

20 years, 9 months

[linux-audio-dev] ICMC2005 Paper Deadline less than 10 days away!

by Pau Arumi

Please note that the ICMC 2005 ( September / Barcelona ) paper submission is less than 10 days away! We urge everyone to post their papers to the suvisoft system as soon as possible to prevent any last minute problems. For details on submissions see http://www.icmc2005.org/ You can also contact Bram de Jong <bdejong(a)iua.upf.es> if you need more details or extra information. kindest regards, The ICMC 2005 team

20 years, 9 months

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