Linux-audio-user December 2008

linux-audio-user@lists.linuxaudio.org

144 participants
133 discussions

Re: [LAU] [FFADO-devel] [ANN] FFADO 2.0 Release Candidate 1 (1.999.40) available

by Pieter Palmers

Jack O'Quin wrote: >> On Sun, 23 Nov 2008, Pieter Palmers wrote: > >>> The FFADO team is proud to announce the first release candidate for >>> FFADO 2.0. > > I just tried the new libffado-2.0-rc1 with jack 0.113.3 (SVN) with my > PreSonus FireBox on Ubuntu Hardy with the 2.6.24-21-rt kernel. The > ffado-diag script says I have the old 1394 stack. Is that a problem? > If so, how do I get the new one? The old stack is exactly what you need. > > The libffado.so got built and installed, but the JACK firewire backend > could not find it, because ldconfig was apparently not run. So, I ran > ldconfig by hand. Also, I notice there is no library versioning, yet. > Is that intentional? Good question. Do you have any suggestions on how we should be doing it? I remember that someone tried to do it, but didn't succeed. > > After fixing that, I am still unable to start JACK. I tried resetting > the bus via gscanbus, but it still does not come up. I am attaching > the ffado-diag output and the ffado-jack.log. You are suffering from hostcontrolleritis. The O2 micro controller has some issues that cause it to stall under certain conditions. There are few things that can help: 1) applying the cycle skip patch to the 1394 kernel sources: http://subversion.ffado.org/wiki/TxSkipPatched 2) decreasing the amount of kernel space buffering will result in this being less likely to occur. You can specify a config file: http://subversion.ffado.org/wiki/ConfigFile Setting the max_nb_buffers_xmit to 32 (or lower) should help. Note however that this will result in a higher sensitivity to xruns since this means that userspace has to refill the buffers every 32/2*8 frames. Probably the best solution is to get a better host controller. Greets, Pieter > > $ jackd -Rv -P70 -d firewire -v6 -r48000 -p1024 -n3 2> ffado-jack.log > > getting driver descriptor from /usr/lib/jack/jack_freebob.so > getting driver descriptor from /usr/lib/jack/jack_oss.so > getting driver descriptor from /usr/lib/jack/jack_firewire.so > getting driver descriptor from /usr/lib/jack/jack_net.so > getting driver descriptor from /usr/lib/jack/jack_alsa.so > getting driver descriptor from /usr/lib/jack/jack_dummy.so > jackd 0.115.3 > Copyright 2001-2005 Paul Davis and others. > jackd comes with ABSOLUTELY NO WARRANTY > This is free software, and you are welcome to redistribute it > under certain conditions; see the file COPYING for details > > JACK compiled with System V SHM support. > registered builtin port type 32 bit float mono audio > registered builtin port type 8 bit raw midi > clock source = system clock via clock_gettime > start poll on 3 fd's > loading driver .. > new client: firewire_pcm, id = 1 type 1 @ 0x806ea80 fd = -1 > new buffer size 1024 > registered port system:capture_1, offset = 4096 > registered port system:capture_2, offset = 8192 > registered port system:capture_3, offset = 12288 > registered port system:capture_4, offset = 16384 > registered port system:capture_5, offset = 20480 > registered port system:capture_6, offset = 24576 > registered port firewire_pcm:C6_dev0_MidiIn, offset = 4096 > registered port system:playback_1, offset = 0 > registered port system:playback_2, offset = 0 > registered port system:playback_3, offset = 0 > registered port system:playback_4, offset = 0 > registered port system:playback_5, offset = 0 > registered port system:playback_6, offset = 0 > registered port system:playback_7, offset = 0 > registered port system:playback_8, offset = 0 > registered port firewire_pcm:P8_dev0_MidiOut, offset = 0 > ++ jack_sort_graph > ++ jack_rechain_graph(): > +++ client is now firewire_pcm active ? 1 > client firewire_pcm: internal client, execution_order=0. > -- jack_rechain_graph() > -- jack_sort_graph > starting server engine shutdown > stopping driver > server thread back from poll > unloading driver > freeing shared port segments > stopping server thread > stopping watchdog thread > last xrun delay: 0.000 usecs > max delay reported by backend: 0.000 usecs > freeing engine shared memory > max usecs: 0.000, engine deleted

17 years

[LAU] [FFADO-devel] [ANN] FFADO 2.0 Release Candidate 1 (1.999.40) available

by Pieter Palmers

Hi, The FFADO team is proud to announce the first release candidate for FFADO 2.0. This release candidate is intended to collect feedback about the library under wide-spread usage. The code should be free of major bugs. We are looking for packagers that are interested in creating packages for their favorite distribution. Please contact us if you can help us out with this. Release and download information: http://www.ffado.org/?q=release/rc1 Currently, the installation options are: * manual build from source [http://www.ffado.org/?q=release/rc1] * semi-automatic build from source into a 'sandbox' [http://subversion.ffado.org/wiki/SandboxInstalls] * APT repository for Ubuntu Gutsy and Hardy (possibly others) [http://www.ffado.org/?q=release/apt] Please test and report issues at our TRAC at http://subversion.ffado.org/ or at the mailing list (ffado-devel(a)lists.sourceforge.net). Please take note of http://subversion.ffado.org/wiki/WritingGoodTickets when reporting bugs. We ask all users of FreeBoB that are not yet testing FFADO to try this release candidate. Note that FFADO can co-exist with FreeBoB without any problems, so you can revert back to your original setup very easily. Enjoy, Pieter Palmers ffado.org

17 years

[LAU] Cowboy composing

by Leslie P. Polzer

Hi folks, I'm looking for hints that will help me get started in composing a piece all of my own. I'm just a hobby musician with modest guitar and keyboard skills and just enough drum knowledge to get something acceptable in Hydrogen. How do you start? Percussion, Bass, Lead? How do you continue? How do you actually get something together? :) I find I can do nice separate pieces but have trouble to come up with something coherent... Thanks for any hints! Leslie -- LinkedIn Profile: http://www.linkedin.com/in/polzer Xing Profile: https://www.xing.com/profile/LeslieP_Polzer Blog: http://blog.viridian-project.de/

17 years

Re: [LAU] best reverb...

by Kjetil S. Matheussen

Kevin Cosgrove: >> Ray Rashif wrote: >>> I like the C* Plate 2x2 - it sounds close to the quality of Pro Tools' >>> reverb. >> I wouldn't know if it's comparable to PT's verb, but I do like that one. >> I use it on almost everything I record. It's especially nice for vocals. > > Nobody's mentioned Gverb yet? I really like the flexibility I get > with it and it sounds really good on everything I've used it on to > date, that would be vox, drums & guitars. All the other instruments I second that. For me, at least, it has been easier to get a natural sounding reverb out of gverb than freeverb. Also check out Fons' version of gverb: "This reverb is based on gverb by Juhana Sadeharju, but the code (now C++) is entirely original. I added a second input for stereo operation, and some code to prevent FP denormalisation. This is a preliminary release, and this plugin will probably change a lot in future versions."

17 years

[LAU] HDMI ?

by Dave Phillips

Greetings, I looked up some information regarding HDMI. The new notebook has an HDMI port, I wondered if anyone here has any experience using such a port. Best, dp

17 years

[LAU] Digital bit perfect ouptut with ALSA

by Paulo Moura Guedes

Hi, I'm trying to get bit perfect output out of my linux box, but I can't find much info on the web. I'm using ALSA. Some questions: - does Linux/ALSA features dynamic sample rates? - is it possible to set the bit-depth? (in my case to 24 bit) - what other variables do i have to consider to get bit transparent ouput, i.e., no resampling at all? Thanks in advance, Paulo

17 years

[LAU] Ubuntu Hard real time kernel (2.6.24-21) poor performance.

by John Tomlinson

After a number of years of making successful music recordings using a combination of rosegarden and ardour on my Ubuntu Dapper Drake system, and my home grown real-time kernels, I thought it was time to upgrade to Hardy Heron and use the proper real time kernel that the experts had built. What a disappointment! I have an internal pci sound blaster live card (emu10k1 chip set) and a M-audio audiophile USB sound module. On my dapper installation, which happened to have 2.6.22.1 real time patched kernel (the default ubuntu kernel was 2.6.15), I could get latencies as low as 1.5ms (32 frames/period) on the sound blaster and 2.7ms ( 64 frames/period) on the USB Audiophile with very few xruns; so few xruns that I used to wonder why people posted to mailing lists/forums about the problem. With the stock Ubuntu 2.6.24-21rt kernel the sound blaster gives xruns every few seconds with no load (no recording and no playing back) at 23ms latency (512 frames/period) and the Audiophile struggles at 43ms ( 1024 frames/period); I am getting xruns every 10-20 seconds. Infact the rt kernel gives little, if any, improvement over the generic kernel. I have the following settings in my limits.conf @audio - rtprio 95 @audio - memlock 512000 @audio - nice -19 And I have a script to set the real-time priorities for the interrupts for the interrupts that the sound system use - usually IRQ17 and IRQ19. My user is also a member of the audio group. I have tried the nohz=no on the kernel start up command line as discussed in numerous fora with no change. I did not expect one: johnt@TOMO001:/boot$ grep NO_HZ config-2.6.24-21-* config-2.6.24-21-generic:CONFIG_NO_HZ=y config-2.6.24-21-rt:# CONFIG_NO_HZ is not set I have also tried the changes described in: http://alsa.opensrc.org/index.php/Usb-audio which also made no difference. Any ideas what to try next? Have I got to go back and start build my own kernels again (which always involved a battle between me and the nvidia graphics card)? John Tomlinson

17 years

[LAU] MIDI Routing/Mixing (Korg X50)

by Simon Williams

Hello everyone. (Are there any other Korg X50 users on the list?) I have an X50, and an Evolution MK-461C MIDI controller board. What I'm trying to do is use the knobs on the MK (and the X50, actually) to control the parameters on the X50, but I've got a major problem. It seems that the only way of getting either of the two keyboards (that is, the actual white and black keys) to control more than one sound is to assign all the sounds to the same channel. The problem with this is: Say I assign a synth pad and a piano sound to channel 1. Then I try to change the volume of the synth pad (using MIDI control 7), using the knobs on either the X50, or the MK (it doesn't matter which). What I find is that the piano, being on the same channel, also has its volume adjusted. Sure, I can use the MIDI filter feature on the X50 to say that the piano ignores volume changes, but then I can't fade out the piano if I want to. Anyone got any suggestions on how to overcome this? Currently the only way I can think of is to send all MIDI events via my laptop and get it to duplicate the note on/off events and send them to all the relevant channels. Is this my only option? Surely the X50 has a better way than this? Also, how well would MIDI cope with this? I have heard people mention that MIDI doesn't work so well if you send lots of data down it (like 8 duplicates of the each note on/off message?). If this is my only option, does anyone know of any better MIDI router/mixer software? Currently the only one I know of is soundfontcombi, but it's not very flexible, and doesn't work so well with JACK's auto patchbay connections. Thanks in advance. Simon

17 years

[LAU] The Drummer's "Gigsaw"

by Philippe Hezaine

Hi all, Except from the fact that drums samples are always short ( no need of sustain, only a triggering), is there some reasons why the drums are always writing with very short durations? Especially I mean CPU's ressources and others. And more especially from the CC7, do they interact with the duration of the notes? ( Because for an easier reading i'm writing the patterns from sixty-fourth note up to eighth note.) -- Phil. Superbonus-Project (Site principal) <http://superbonus.project.free.fr> Superbonus-Project (Plate-forme d'échange): <http://philippe.hezaine.free.fr>

17 years

[LAU] Are there any apps that do shaped notes?

by Christopher Stamper

I'm looking for a application like Rosegarden that supports shaped notes<http://en.wikipedia.org/wiki/Shape_note>. Actually, I'd really like to use shaped notes in Rosegarden. I want to be able to easily print rg and midi files with shaped notes. Note display doesn't matter that much, as long as they print shaped. I don't want to have to buy Finale just for this... Any suggestions? Thanks! -- Christopher Stamper Email: christopherstamper(a)gmail.com Web: http://tinyurl.com/2ooncg gTalk: http://tinyurl.com/6e359r Skype: cdstamper

17 years

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Linux-audio-user December 2008