Linux-audio-dev July 2003

linux-audio-dev@lists.linuxaudio.org

84 participants
89 discussions

Re: [linux-audio-dev] It's been more than a year... Have things improved?

by jacob robbins

>1- GUI programming, and interface/audio syncronization. As well as I can >Is it accepted to lock in cases where a destructive operation is being >performed? As far as I am concerned it is never acceptable for a regular thread to lock an rt thread for exactly the reason you mention: priority inversion deadlock. You forgot to mention one other method for achieving this communication; System V ipc messages, which i prefer because they don't lock (if used right) and they are simple. See the man pages for msgget, msgsnd, msgrcv. >3-Host instruments. I remember some discussion on XAP a while ago,... I think that LADSPA plugins can be used as softsynths to good effect. LADSPA hint # 0x2C0 (LADSPA_HINT_DEFAULT_440) allows for a plugin to be pitch controlled. This is not as fancy as other plugin api's but it works and I think we will see more and more use of it. Using a LADSPA plugin as a softsynth requires a decent amount of work on the part of the host: each LADSPA plugin instance is only one voice and polyphony must be handled by the host. However, there are now hosts out there that have the framework to handle this. >4-Interface abstraction for plugins.: We all know how our lovely X11.. >Steve Harris proposed the use of (rdf was it?), Steve Harris' lib-rdf is available: http://plugin.org.uk//lrdf/ but i have not used it and can not say anything useful about it. It is used by ardour though. -jacob robbins.....

21 years, 8 months

Re: [linux-audio-dev] cheesetracker 0.8: unable to build

by nikodimka

Well okay I did it. It works! And looks perfect. And more usable. And I have seen channel numbers 0., 0/(M) and 00 and coredump in 10 seconds after that. anyways thanks for making such a cool program! nikodimka. __________________________________ Do you Yahoo!? SBC Yahoo! DSL - Now only $29.95 per month! http://sbc.yahoo.com

21 years, 8 months

Re: [linux-audio-dev] cheesetracker 0.8: unable to build

by nikodimka

Correct. bad moc. I have already figured this out. "just send compiler error to google and you know whats wrong". maybe you should not use plain moc command in SConstruct, but with full path prefix. 10x, nikodimka PS: I am still unable to compile, but I keep moving in that direction. __________________________________ Do you Yahoo!? The New Yahoo! Search - Faster. Easier. Bingo. http://search.yahoo.com

21 years, 8 months

[linux-audio-dev] cheesetracker 0.8: unable to build

by nikodimka

Hello LADs! I am trying to build cheestracker 0.8.0 on debian-stable, g++-2.95, with custom installed qt3 and getting trouble. here's how the make log looks like: =================================8<================= scons . scons: Reading SConscript files ... Detecting if PKG-CONFIG is installed... 0.11.0 pkg-config found! Checking for libsigc++-1.2... 1.2.5 libsigc++-1.2 found! QT Check: $QTDIR exists at, using QTDIR instead of harcdoded pathlist /export/qt3/ Looking for QT 3.x Includes: /export/qt3//include/qt Checking QT version.. #define QT_VERSION_STR "3.0.3" Looking for QT 3.x Libraries: using: -lqt-L/export/qt3//lib Looking for QT 3.x 'moc' Binary: moc command: /export/qt3//bin/moc QT was found! Detecting if OSS exists on the system.. OSS was found. Dependency check successful, writing cache MOC check: property_bridge_edit.h MOC check: cspinbutton.h MOC check: ccolor_bridge.h MOC check: ccolor_list.h MOC check: font_bridge.h MOC check: keyboard_input_config.h MOC check: audio_config.h MOC check: sample_editor.h MOC check: sample_editor_format.h MOC check: sample_viewer.h MOC check: sample_viewer_zoom.h MOC check: envelope_point_editor.h MOC check: envelope_editor.h MOC check: resampler_config.h MOC check: note_bridge.h MOC check: sample_editor_clipboard.h MOC check: sample_editor_effects.h MOC check: pattern_edit.h MOC check: pattern_edit_widget.h MOC check: sample_edit.h MOC check: instrument_edit.h MOC check: interface.h MOC check: order_and_defaults_editor.h MOC check: variables_edit.h MOC check: mdi_main_window.h mdi_main_window.h:201: Warning: Variable as signal or slot. ['sigc-1.2'] scons: done reading SConscript files. scons: Building targets ... c++ -I/export/local/lib/sigc++-1.2/include -I/export/local/include/sigc++-1.2 -D POSIX_ENABLED -O3 -ffast-math -DOSS_ENABLED -Icommon/ -Icommon/defines/ -Icommon /components/data -I/export/qt3//include/qt -Icommon -I. -Icommon/defines -c -o c ommon/interface__QT/audio/moc__audio_config.o common/interface__QT/audio/moc__au dio_config.cpp common/interface__QT/audio/moc__audio_config.cpp:30: no `void Audio_Config::init MetaObject()' member function declared in class `Audio_Config' common/interface__QT/audio/moc__audio_config.cpp: In method `void Audio_Config:: initMetaObject()': common/interface__QT/audio/moc__audio_config.cpp:34: implicit declaration of fun ction `int badSuperclassWarning(...)' common/interface__QT/audio/moc__audio_config.cpp: At top level: common/interface__QT/audio/moc__audio_config.cpp:41: prototype for `class QStrin g Audio_Config::tr(const char *)' does not match any in class `Audio_Config' common/interface__QT/audio/audio_config.h:41: candidate is: static class QString Audio_Config::tr(const char *, const char * = 0) common/interface__QT/audio/moc__audio_config.cpp: In function `static class QMet aObject * Audio_Config::staticMetaObject()': common/interface__QT/audio/moc__audio_config.cpp:95: no method `QMetaObject::new _metadata' common/interface__QT/audio/moc__audio_config.cpp:96: no method `QMetaObject::new _metaaccess' common/interface__QT/audio/moc__audio_config.cpp:98: `struct QMetaData' has no m ember named `ptr' common/interface__QT/audio/moc__audio_config.cpp:98: `QMember' undeclared (first use this function) common/interface__QT/audio/moc__audio_config.cpp:98: (Each undeclared identifier is reported only once common/interface__QT/audio/moc__audio_config.cpp:98: for each function it appear s in.) common/interface__QT/audio/moc__audio_config.cpp:98: parse error before `;' common/interface__QT/audio/moc__audio_config.cpp:101: `struct QMetaData' has no member named `ptr' multiple parse errors follow. nikodimka __________________________________ Do you Yahoo!? SBC Yahoo! DSL - Now only $29.95 per month! http://sbc.yahoo.com

21 years, 8 months

[linux-audio-dev] OpenAFS and preemptible patch

by Maarten De Boer

Hello, I have been doing some tests with OpenAFS, and it hangs on me frequently. On the OpenAFS I found out that this is very likely caused by the preemptible patch. Knowing that a lot of people around here are using that patch, I'd like to ask if any of you have experienced the same, and know of a solution, or an alter- native that NFS which would work well with low latency kernels. Maarten

21 years, 8 months

[linux-audio-dev] Re:%20[linux-audio-dev]%20Echo%20Darla/Gina/Layla/...%20on%20Linux&replyto=200212060226.gB62QY48020703_AT_mail.space2u.com

by Shred Master

HELL YEAH!! - Shred. <a href="http://www.shred.ath.cx/">http://www.shred.ath.cx/</a> <a href="http://www.mp3.com.au/obsidian">http://www.mp3.com.au/obsidian - Obsidian - Original Hard Rock at its BEST!</a>

21 years, 8 months

[linux-audio-dev] Re:%20[linux-audio-dev]%20Echo%20Darla/Gina/Layla/...%20on%20Linux&replyto=200212060226.gB62QY48020703_AT_mail.space2u.com

by Shred Master

21 years, 8 months

[linux-audio-dev] gmorgan-0.01

by holborn

Hi! First Release. gmorgan is a .. Rhythm Station, an organ with auto-accompaniment. Uses MIDI and the ALSA sequencer for play the rhythm patterns. Styles, patterns and sounds, the mixer settings, can be edited and saved. Tested on Gentoo, debian PIII 933 and PII 300 REQUERIMENTS -------------------------- Linux ALSA Fltk Take a look at http://personal.telefonica.terra.es/web/soudfontcombi/ And please ... if you enjoy this prog and wants to share patterns, send me, and i will include in future versions, i have a large TODO, and i need some help. Josep

21 years, 8 months

Re: [linux-audio-dev] Shared memory?

by Juhana Sadeharju

Could anyone check the shmserver.tar.gz, compile it, and test if you have the same problem? Additional instructions below. I have though about why the shared memory freezes. It could be that Linux copies the shared memory pages for each client: one shared memory segment, multiple copies. Would locking the memory help? Maybe, maybe not. I know there are high performance applications using the shared memory well (at least their authors may think so). But so does my own alsashmrec works well too (so I thought). If there indeed is a severe (a minor?) problem in the kernel, then in all these application it may cause very short freezes (until read, write, sleep, suspend, etc. call releases it). A jitter in updating lock-free FIFOs on shared memory. If you don't get it or otherwise cannot find out what is going on, then where I should post this? Is there a list where the kernel and shared memory experts are reading? And hey, why shmget did not work? See shmalloc_named_get(). Best regards, Juhana Additional instructions and the previous mail. 1. Compile it without sleep(1) [ as in code below ] and without fprintf with ggg's [ one could change that to "g" so that screen does not go too fast ]. Then compile and test with sleep, and then test with fprintf with "g". 2. First run shmserver in a terminal. Copy the mid value (second value printed). 3. Then run shmclient in another terminal. Paste the mid value: % shmclient <midvalue> >From: Juhana Sadeharju <kouhia(a)nic.funet.fi> >To: linux-audio-dev(a)music.columbia.edu >Subject: >Date: Fri, 4 Jul 2003 16:46:25 +0300 >Reply-To: linux-audio-dev(a)music.columbia.edu > >>From: Ralfs Kurmis <kurmisk(a)inbox.lv> >> >>Try out this example >>Split it in seperate files >>( Needs x ) > >Hello. Thanks for the example, but I see some problems there: >if the second process does not find the segment given by the key, >you example makes two distinct segments. That is what happen with >me. Because I don't have IPC_CREAT in the second process, my >program simply fails instead of creating second segment. > >I got it working otherway, but there are severe problems. >In client, I simply skipped the shmget() and queried >immediately the segment with shmat() with the mid value >printed by the server. > >The example mailed here used shmget() with IPC_CREAT. >When I used IPC_CREAT for both server and client, as I expected, >I got two separate shared memories. In fact, as I make the shared >memory in shmserver which is run first, the shmclient should not use >IPC_CREAT at all. > >It works, but while the server seems to fill the shared memory >with increasing integer numbers, the client behaves strangely. >I have this code in shmclient now: > > k = -1; > for (;;) { > if (k != nums[1]) { > k = nums[1]; > fprintf(stderr,"%i\n",k); > } > // sleep(1); > // fprintf(stderr,"ggggg\n"); > } > >What should it do? It should ideally print the increasing numbers: >5435, 5436, 5437, etc. With sleep(1) it prints a new value once per >second. However, without sleep(1), it prints only one number and then >does not print anything anymore. It looks like Linux does not update >the shared memory, why? > >When the "ggggg" is printed (without sleep), the shmclient prints only >one number and repeatedly the "ggggg". Why the shared memory is not >updated in this? I remember I had a similar problem with old XWave >software at 1998 with much earlier kernel version (now I have 2.4.18 of >RedHat 7.3). > >This looks serious problem. It may be that nobody has noticed >it because either one uses sleep() or read()/write() in an >audio system. That is, your software may work, but the problem >may degrage the performance (as it certainly did freeze the >printing in my shmclient). Perhaps the problem may cause an audio >engine never work as fully as possible. > >If you get the shmclient work while the sleep(1) is commented out, >please let me know :-) > >http://www.funet.fi/~kouhia/shmserver.tar.gz

21 years, 8 months

[linux-audio-dev] [ANN] VLevel 0.5

by Tom Felker

Hello all, I've been working on VLevel, a LADSPA plugin to keep me from having to fiddle with the volume, and it's now in a useful state, so I'm looking for some feedback. Basically, VLevel keeps track of the peak amplitudes, and adjusts the volume smoothly to make the quiet parts louder. Since it looks ahead a few seconds, the gain change is always smooth. <http://vlevel.sourceforge.net> VLevel is written in C++. I have two questions. First, why do most other plugins allocate and free copies of their strings and structures, instead of just passing the literal (as I do)? The declarations in ladspa.h don't allow the host to modify what the pointers reference. Second, I keep a buffer of length n in my code, so the first n seconds of data I return is useless, and after the audio is sent, I need n more seconds of input before all the audio is returned. Is there any way of informing the host about this? In the future I plan to make some performance improvements, and perhaps a nice cross-platform GUI for applying VLevel to files. I may also try to get XMMS-LADSPA to save its state, which would be very useful to me. I suppose VLevel could use RMS or a psychoacoustic model to estimate volume, but that would make it very complex, and more difficult to avoid clipping. Despite that, it serves my purpose, to play classical music on the road, quite well. Have fun, -- Tom Felker <tcfelker(a)mtco.com>

21 years, 8 months

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Linux-audio-dev July 2003