Linux-audio-user August 2005

linux-audio-user@lists.linuxaudio.org

169 participants
209 discussions

[linux-audio-user] Python & ALSA --- documentation

by Peter Brinkmann

Atte, Iain, Tim, and everyone else who's interested in Python and ALSA: As promised, I've put together some documentation of my Python bindings for the ALSA sequencer API. You can find the new version at http://www.math.tu-berlin.de/~brinkman/software/midikinesis/ The module pyseq.py is the heart and soul of the package. I've added a simple MIDI file player, midiplayer.py, as a tutorial that shows most aspects of the bindings in action. The package also contains a number of other applications built with the bindings. Most of them are pretty straightforward, except possibly MidiKinesis, which I presented at LAC 2005, and the new module leierkasten.py: That one receives control change messages from, say, a MIDI controller keyboard and converts their rate of change into MIDI tempo messages. The MIDI file player, midiplayer.py, pays attention to incoming tempo messages, so that you can plug leierkasten.py into midiplayer.py in order to create a virtual hand organ. Any feedback would be appreciated; questions are always welcome. All the best, Peter

19 years, 3 months

[linux-audio-user] Multimedia kernel debian

by studio-64

Hi Is there a multimedia kernel for debian I can install with apt-get? basicaly I'm building another Audio box from scatch and have a basic gnome system. cheers Bob

19 years, 3 months

[linux-audio-user] Again on sudden and occasional Jack crackling sound

by Salvatore Di Pietro

Aaaargh. It Happened Again(TM). Do you remember http://music.columbia.edu/pipermail/linux-audio-user/2005-March/022049.html ? I have always suffered the same problem, (though much less now) along many jack, alsa and kernel versions and configurations... I got: Slackware 10.1 kernel 2.6.12.2 vanilla (but older versions worked equally well) ALSA 1.0.8 JACK 0.99.0 all compiled from sources AMD Athlon XP 3000+ AsRock K7S8X SB Live! Digital 5.1 (hw:0) SB Live! Player 5.1 (hw:1) ForteMedia FM801 (hw:2) RTL8139 Matrox G450 DualHead AGP every card runs on its own IRQ: root at slack101-sal:/home/salvuz# cat /proc/interrupts CPU0 0: 3067468 IO-APIC-edge timer 1: 4252 IO-APIC-edge i8042 8: 0 IO-APIC-edge rtc 9: 0 IO-APIC-level acpi 12: 68805 IO-APIC-edge i8042 14: 130386 IO-APIC-edge ide0 15: 107823 IO-APIC-edge ide1 16: 0 IO-APIC-level FM801 17: 2080 IO-APIC-level eth0 18: 1138 IO-APIC-level EMU10K1 19: 0 IO-APIC-level EMU10K1 20: 0 IO-APIC-level ohci_hcd:usb2 21: 0 IO-APIC-level ohci_hcd:usb3 23: 0 IO-APIC-level ehci_hcd:usb1 NMI: 0 LOC: 3067418 ERR: 0 MIS: 0 The problem in detail: Sometimes in occurence of a client being closed or added, but sometimes apparently randomly, without xruns and not necessarily under heavy load, I experience sudden corruption of sound, in form of crackling sound coming out of alsa_pcm:playback ports. Capture and client ones are not affected, i.e. I can record cleanly even under crackling sound condition: if I close every client, restart jack and play what I recorded just before, the sound is not corrupted at all, just (software) monitoring is horrible. I use my SB Lives always at 48kHz (but the problem arises at other SR too), I tried on the ForteMedia FM801, on the intel8x0 C-Media builtin soundcard (ugh!), on the PC of a friend of mine with NVidia chipset, nVidia builtin soundcard, SB Live and Agnula 1.2.1, I tried Agnula 1.2.1 along with my Slackware on my system, with various buffer, periods and other settings that jackd accepted. Nothing helped. The show-stopping noise, even if certainly not seldom, came out. Well, I noticed that continuing to open and close clients, or doing something apparently "heavy" such as choosing a PADsynth intsrument (such as ChoirPad 1) in Zynad (upon choosing PADsyn instruments Zynad GUI hangs for a moment, then the instrument is ready), I could screw the sound in the same identical manner (the sound appears distorted in the very same way), but also I could restore (after one, two or little more tries) the clean sound from alsa_pcm:playback ports. To make things easier, I wrote this little script that does the dirty work: itstarts jack_simple_client, than *stops the process* (do you hear the alarm siren?) then CONTinues it, then kills it (quite obvious) #!/bin/bash # Pound on broken TV set sudo jack_simple_client POUND! & sudo kill -STOP `ps -el|grep simple|awk '{print $4}'` sleep 0.2 sudo kill -CONT `ps -el|grep simple|awk '{print $4}'` sleep 0.1 sudo kill -9 `ps -el|grep simple|awk '{print $4}'` I know, with this script I am juggling chainsaws over Jack... sorry about that. But it somewhat works (I must admit sometimes jackd dies after the treatment, but there's a let's say 80% probability it doesn't). A painless,and "100% success cases, no jackd deaths" approach is to use jack_bufsize: I simply re-set jackd buffer size and voila, back to clean sound. Try that if you have the same problem: sudo jack_bufsize `ps aux|grep jack|grep " -p" \ | awk '{print $19}'|sed 's/-p//'|uniq` So I think it's a buffer issue that somewhat involves the hardware output ports... I lived satisfied with this setup...until I discovered that oss2jack 0.21 stops working upon executing jack_bufsize. Aaarghh! Maybe oss2jack 0.21 isn't happy with buffer resizing, whereas 0.15 was ok. Tooooooooo bad, because I had: Gnome Wave Cleaner Avidemux2 ReZound (playback only) Skype sox GNUsound (native JACK supports segfaults) ZynAdSubFX (it gives me rock solid performance even upon loading a PADsynt instrument) all working with jack... :( oss2jack 0.15 doesn't die with jack_bufsize, but doesn't handle capture. I then read this from Jesse Chappell: excerpt from http://music.columbia.edu/pipermail/linux-audio-user/2005-March/022074.html --------------------------------------------------------------------- Anyone who is having this problem, please try a version of JACK from CVS where the version is >= 0.99.52 (after 17 march). I made some fixes to jack's alsa driver that *might* help this problem. I know compiling your own jackd might be a little much to ask, but I'm very curious. --------------------------------------------------------------------- Now that jack 0.100.0 was out, I grabbed the source, ./configure --prefix=/usr --enable-stripped-jackd --disable-portaudio --disable-coreaudio --enable-capabilities --enable-optimize --enable-posix-shm --enable-resize --enable-timestamps --with-default-tmpdir=/mnt/ramfs make && make install and thought the end of my nightmare had finally come, but, unfortunately, that's not the case... As in subject, It Happened Again. And,worst of all, all jack clients (not only oss2jack), even ardour (even via his latency panel), die with cannot open shm segment /jack-1 (No such file or directory) cannot attach port segment shared memory (No such file or directory) Killed upon setting jack buffersize. I prepared two ogg files that will explain the weird sound: http://mio.discoremoto.virgilio.it/salvuz For those who don't speak Italian... - check the "Seleziona tutti" (select all) checkbox - then click on "Scarica" (download) button I had Jack running on hw:0 via qjackctl at 256 frames per buffer: /usr/bin/jackstart -v -R -p512 -t10000 -dalsa -dhw:0 -r48000 -p256 -n2 -s -S I fired up ZynAddSubFX, Hydrogen and two istances of qarecord, one with --jack, connected to Zyn and Hydrogen, the other one on another card (hw:1) with ALSA, capturing via "Line in" what came out of hw:0 "Line out", begin to record something (just a test case, as I am a guitarist that tries to play keyboards) then induced corruption with the "pound" script. Another couple of "pounds", and the sound comes clear again, but you know the story. I hope to have been of any help, and I wonder whan can be done... Thanks for your care! ciao -- salvuz POST FATA RESVRGO Linux registered user #291700 | machine #174619 get counted on ---> http://counter.li.org/ <---

19 years, 3 months

[linux-audio-user] Re: Gnome Wave Cleaner

by Mike Jewell

Thanks for trying, Fernando. If I lived closer (than N. Idaho) I'd come down there and sweep the floors or restore user's files from backup to give you a little time to do more of the great work you've done putting Planet CCRMA together so "Linux challenged" users like me can do more music and less computer. I did CAD application and OS support for 15 years at HP/Agilent and I know how little time there is left over after just keeping the wheels on! Hang in there. 8^) Here's more of a philosophical question. Can someone help me understand why installing an app like Gnome Wave Cleaner on a "standard", clean Linux distribution like my Fedora Core 3 from CCRMA is so d??n difficult? Shouldn't all these libraries, etc just already be there? I can maybe understand the unusual ones like "fftw" (Fastest Fourier Transform in the West) but why all the missing Gnome components? It's probably only me that's missing something but it seems to me that Linux is never going to become even close to mainstream (maybe we don't want it to be mainstream) until it gets a good, consistent across all distros, way of installing apps that just works. I love using Linux and, as always, I'm open to feedback, suggestions, education, etc. (Especially education!) 8^) Thanks, Mike Mike Jewell One-Up Audio On Mon, 2005-08-08 at 18:26 -0700, Fernando Lopez-Lezcano wrote: > On Mon, 2005-08-08 at 18:23, Fernando Lopez-Lezcano wrote: > > Hmmm, he must have gotten it from somewhere else, it is not part of > > Planet CCRMA (not because I don't want it to be, just no time to do it > > so far). Sorry. > > I do have a spec file and just tried to rebuild it to try to remember > why I had not finished packaging it and it stops with some build error: > > checking how to run the C preprocessor > biquad.c: In function `filter_audio': > biquad.c:64: warning: implicit declaration of function > `load_filter_preferences'biquad.c:126: warning: unused variable > `p_first' > biquad.c:59: warning: unused variable `i_left' > biquad.c:59: warning: unused variable `i_right' > biquad.c:61: warning: unused variable `filtered_sample' > biquad.c: At top level: > biquad.c:247: error: conflicting types for 'load_filter_preferences' > biquad.c:64: error: previous implicit declaration of > 'load_filter_preferences' was here > > Hmmm, does not look difficult to fix, apparently a double declaration. > -- Fernando

19 years, 3 months

[linux-audio-user] Re: Again on sudden and occasional Jack crackling sound

by Kjetil Svalastog Matheussen <k.s.matheussen＠notam02.no>

Lee Revell: > > On Tue, 2005-08-09 at 16:49 -0400, Paul Davis wrote: >> On Tue, 2005-08-09 at 22:17 +0000, Salvatore Di Pietro wrote: >> >> > Moreover, using jack_bufsize, or resizing buffer within Ardour, causes >> > complete muting of output sound (bit not clients death, as it was >> > before), until I restart jack. >> > Notice that this "complete muting" only affects the output ports, i.e. >> I >> > can continue recording with qarecord, or ardour, I just cannot hear >> (and >> > monitor) anything anymore until I restart jack and its clients. >> >> as far as we can tell, this is an ALSA (kernel) driver issue. it does >> not affect other backends, and does not affect (we think) every ALSA >> supported piece of h/w. it would be nice for it to be either fixed or at >> least tracked down conclusively. >> > > I suspect it's in the ALSA core (could be alsa-lib or in the kernel) as > it's been reported with everything from ice1712 to emu10k1 to RME > hardware to cheap onboard stuff. > Okey, this might be totally wrong. It might be that I haven't fully understood how the lock/unlock-stuff in the jack engine works. But reading the code for jack_driver_buffer_size in jackd/engine, the following seems to happen: 1. Lock graph 2. Change the buffer sizes integer for all the clients on the server: for-each-client-do: client->control->nframes = nframes; 3. Unlock the graph. 4. Lock the graph 5. Send a message to all clients that the buffersize must be changed. 5. Unlock the graph. So, from what I can see, a process-cycle can happen between point 3 and 4, where the server think the buffersize is the new value, while the clients thing the buffersize is the old value.

19 years, 3 months

[linux-audio-user] missing snd-usb-audio module in Gentoo

by Nigel Henry

Hi. Amazingly after emerging alsa-lib, alsa-utils, and alsa-oss, running alsaconf, and pushing up the master volume in alsamixer, the sounds worked OOTB. I had to add snd-seq-midi to /etc/modules.autoload.d, as it hadn't autoloaded at bootup. The problem is that even though the midi keyboard shows up in /proc/bus/usb/devices, it does not show up in Qjackctl's midi connect bay. Tried modprobe snd-usb-audio, but it complains that there is no such module. As shown below, the kernel config shows snd-usb-audio there, but commented out. All relevant info further down. Nigel. Kernel: Genkernel: Version 2.6.11-gentoo-r9 Alsa version: 1.08 KDE 3.3.2 X11-6.8.2-r1 Audigy2 soundblaster (emu10k1) Part content from /etc/kernels/kernel-config-x8 # # Advanced Linux Sound Architecture # CONFIG_SND=m CONFIG_SND_TIMER=m CONFIG_SND_PCM=m CONFIG_SND_HWDEP=m CONFIG_SND_RAWMIDI=m CONFIG_SND_SEQUENCER=m # CONFIG_SND_SEQ_DUMMY is not set CONFIG_SND_OSSEMUL=y CONFIG_SND_MIXER_OSS=m CONFIG_SND_PCM_OSS=m CONFIG_SND_SEQUENCER_OSS=y # CONFIG_SND_RTCTIMER is not set # CONFIG_SND_VERBOSE_PRINTK is not set # CONFIG_SND_DEBUG is not set USB devices # # CONFIG_SND_USB_AUDIO is not set # CONFIG_SND_USB_USX2Y is not set # # Open Sound System # # CONFIG_SOUND_PRIME is not set # # USB support # CONFIG_USB=m # CONFIG_USB_DEBUG is not set # # Miscellaneous USB options # CONFIG_USB_DEVICEFS=y # CONFIG_USB_BANDWIDTH is not set # CONFIG_USB_DYNAMIC_MINORS is not set # CONFIG_USB_SUSPEND is not set # CONFIG_USB_OTG is not set CONFIG_USB_ARCH_HAS_HCD=y CONFIG_USB_ARCH_HAS_OHCI=y # # USB Host Controller Drivers # CONFIG_USB_EHCI_HCD=m # CONFIG_USB_EHCI_SPLIT_ISO is not set # CONFIG_USB_EHCI_ROOT_HUB_TT is not set CONFIG_USB_OHCI_HCD=m CONFIG_USB_UHCI_HCD=m # CONFIG_USB_SL811_HCD is not set # # USB Device Class drivers # # CONFIG_USB_AUDIO is not set # CONFIG_USB_BLUETOOTH_TTY is not set # CONFIG_USB_MIDI is not set # CONFIG_USB_ACM is not set CONFIG_USB_PRINTER=m /sbin/lsmod bash-2.05b$ /sbin/lsmod Module Size Used by snd_emu10k1 81540 0 snd_ac97_codec 67576 1 snd_emu10k1 snd_util_mem 3328 1 snd_emu10k1 snd_hwdep 6944 1 snd_emu10k1 snd_pcm_oss 46496 0 snd_pcm 76040 3 snd_emu10k1,snd_ac97_codec,snd_pcm_oss snd_page_alloc 7428 2 snd_emu10k1,snd_pcm snd_mixer_oss 16128 1 snd_pcm_oss snd_seq_midi 6432 0 snd_rawmidi 18848 2 snd_emu10k1,snd_seq_midi snd_seq_midi_event 6016 1 snd_seq_midi snd_seq 44944 2 snd_seq_midi,snd_seq_midi_event snd_timer 19460 3 snd_emu10k1,snd_pcm,snd_seq snd_seq_device 6796 4 snd_emu10k1,snd_seq_midi,snd_rawmidi,snd_seq snd 44132 10 snd_emu10k1,snd_ac97_codec,snd_hwdep,snd_pcm_oss,snd_pcm,snd_mixer_oss,snd_rawmidi,snd_seq,snd_timer,snd_seq_device 8139too 19584 0 mii 3968 1 8139too sata_via 5636 0 sata_svw 5252 0 sata_sil 6020 0 sata_promise 7812 0 libata 39172 4 sata_via,sata_svw,sata_sil,sata_promise dm_mod 50812 0 sbp2 20360 0 ohci1394 28676 0 ieee1394 87860 2 sbp2,ohci1394 ohci_hcd 18184 0 uhci_hcd 27664 0 usb_storage 27776 0 usbhid 30016 0 ehci_hcd 27400 0 usbcore 97400 6 ohci_hcd,uhci_hcd,usb_storage,usbhid,ehci_hcd bash-2.05b$ bash-2.05b$ cat /proc/bus/usb/devices T: Bus=02 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2 B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0 D: Ver= 1.10 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=0000 ProdID=0000 Rev= 2.06 S: Manufacturer=Linux 2.6.11-gentoo-r9 uhci_hcd S: Product=VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (#2) S: SerialNumber=0000:00:07.3 C:* #Ifs= 1 Cfg#= 1 Atr=c0 MxPwr= 0mA I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=255ms T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2 B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0 D: Ver= 1.10 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=0000 ProdID=0000 Rev= 2.06 S: Manufacturer=Linux 2.6.11-gentoo-r9 uhci_hcd S: Product=VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller S: SerialNumber=0000:00:07.2 C:* #Ifs= 1 Cfg#= 1 Atr=c0 MxPwr= 0mA I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=255ms T: Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 2 Spd=12 MxCh= 0 D: Ver= 1.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 P: Vendor=0a4d ProdID=0066 Rev= 2.52 S: Manufacturer=Evolution Electronics Ltd. S: Product=MK-225C USB MIDI keyboard C:* #Ifs= 2 Cfg#= 1 Atr=c0 MxPwr= 0mA I: If#= 0 Alt= 0 #EPs= 0 Cls=01(audio) Sub=01 Prot=00 Driver=(none) I: If#= 1 Alt= 0 #EPs= 2 Cls=01(audio) Sub=03 Prot=00 Driver=(none) E: Ad=81(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms E: Ad=02(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms cat /proc/asound/cards 0 [Audigy2 ]: Audigy2 - Sound Blaster Audigy2 Sound Blaster Audigy2 (rev.4, serial:0x10021102) at 0xd800, irq 10 cat /proc/asound/devices 1: : sequencer 4: [0- 0]: hardware dependent 9: [0- 1]: raw midi 8: [0- 0]: raw midi 18: [0- 2]: digital audio playback 26: [0- 2]: digital audio capture 25: [0- 1]: digital audio capture 16: [0- 0]: digital audio playback 24: [0- 0]: digital audio capture 0: [0- 0]: ctl 33: : timer /etc/hotplug/blacklist. But I don't think there's anything here that could cause a problem. # Listing a module here prevents the hotplug scripts from loading it. # Usually that'd be so that some other driver will bind it instead, # no matter which driver happens to get probed first. Sometimes user # mode tools can also control driver binding. # # Syntax: driver name alone (without any spaces) on a line. Other # lines are ignored. # # uhci ... usb-uhci handles the same pci class usb-uhci # usbcore ... module is loaded implicitly, ignore it otherwise usbcore # tulip ... de4x5, xircom_tulip_cb, dmfe (...) handle same devices de4x5 # At least 2.4.3 and later xircom_tulip doesn't have that conflict # xircom_tulip_cb dmfe #evbug is a debug tool and should be loaded explicitly evbug Thats all folks. Any suggestions apart from "Reinstall the OS" welcome.

19 years, 3 months

Re: [linux-audio-user] Book Recommendation

by davidrclark＠earthlink.net

Bob, Thanks for your suggestion; I'll check it out... >For a real esoteric view on Mixing and mastering try 'mixing with your mind' >but I warn you its quite esoteric, will suit the few of us who meditate >when mixing/mastering. Regards, Dave.

19 years, 3 months

[linux-audio-user] Installing Gnome Wave Cleaner

by Mike Jewell

Hi LAUs, I'm trying to install Gnome Wave Cleaner on my FedoraCore3 (CCRMA) box and am (as usual, for me) running into dependency hell. In order of GWC's ./configure complaints: **I first installed libsndfile (which already existed in /usr/bin but apparently some other component was missing.) This fixed that error. **I then installed fftw (which also existed bla, bla, bla.) Fixed. **It then complained about libgnomeui. When I ./configure that one I get: checking for esound >= 0.2.26 audiofile >= 0.2.3... Package esound was not found in the pkg-config search path. Perhaps you should add the directory containing `esound.pc' to the PKG_CONFIG_PATH environment variable No package 'esound' found checking for libgnome-2.0 >= 2.0.0 libgnomecanvas-2.0 >= 2.0.0 libbonoboui-2.0 >= 2.0.0 gconf-2.0 >= 1.1.11... Package libgnome-2.0 was not found in the pkg-config search path. Perhaps you should add the directory containing `libgnome-2.0.pc' to the PKG_CONFIG_PATH environment variable No package 'libgnome-2.0' found configure: error: Library requirements (libgnome-2.0 >= 2.0.0 libgnomecanvas-2.0 >= 2.0.0 libbonoboui-2.0 >= 2.0.0 gconf-2.0 >= 1.1.11) not met; consider adjusting the PKG_CONFIG_PATH environment variable if your libraries are in a nonstandard prefix so pkg-config can find them. Am I totally on the wrong track here? In concept, installing apps on Linux is pretty simple but I can't ever remember having it just work for me using the standard ./configure, make, make install process. Sure wish CCRMA had an apt-get package... Sure wish I understood Linux better. 8^) Thanks for any help on this, Mike Mike Jewell One-Up Audio On Fri, 29 Jul 2005 07:19 , Mike Jewell <mj405(a)oneupaudio.com> sent: >> >>When I go to the gwc site (http://gwc.sourceforge.net\) I'm confused >>as to what to get. >> And Jan Depner wrote: > At the bottom of the page, go to "The GWC project files at >sourceforge.net". > Grab gwc2. Its a tgz so you'll have to do the obligatory ./configure, >make, make install (read the README and/or INSTALL file). >Jan

19 years, 3 months

[linux-audio-user] Book Recommendation

by davidrclark＠earthlink.net

Greetings all, As many of you know, Bob Katz's book on mastering has been recommended over and over. It really is worthwhile. I thank Mark Knecht especially for getting me to buy it. Anyone working in digital audio, even those who think they know it all, can benefit from this book. A new book was recently published, and I just obtained a copy of it: The Art of Digital Music by David Battino and Kelli Richards. Now I've just started reading parts of it, but I've already seen some really good advice. This consists of interviews of 56 people in the industry plus some conferences. There is a DVD consisting of not just a little marketing, but it's OK. The book also has noticeable hype BUT: The interviews are something like what you may have seen in Electronic Musician, but it's nice to see a lot more all in one place. I find myself nodding my head in agreement over and over again... I don't recommend this to anyone just getting started. You need some experience to understand WHY they say the things they do. Without it, you won't find this book very helpful. One of the things I like about this new book is that it provided validation of some of my own conclusions about working with digital audio. It's also good to see differences of opinion. Regards to all, Dave.

19 years, 3 months

[linux-audio-user] Creox / Ecamegapedal routing

by Hans

Hello list, How do I route a signal from line-in (guitar) to either Creox or Ecamegapedal using jackd? I use qjackctl, but the only input/outputs are alsa_pcm. I guess it must be simple, but I simply don't get it :-) Thanks, Hans

19 years, 3 months

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Linux-audio-user August 2005