Linux-audio-user August 2005

linux-audio-user@lists.linuxaudio.org

169 participants
209 discussions

[linux-audio-user] Multi-channel voice actuated recording

by Kent Tenney

Howdy, (origonally posted to gmane.linux.agnula.general, it was suggested to try this list as well) I need to monitor and record a number of radio and telephone inputs. When the conversation is finished, I need to compress the audio and log the time and source of the recording. I installed Agnula DeMuDi on a spare machine, it seems to know all about the M-Audio Delta 1010lt card which is in there. That's about all I know. Questions; - am I asking these questions on the correct list? if not, please give directions. - does a project exist which seeks to do multi-channel voice actuated recording? - if not, is this a reasonable task to attempt for a low/mid level Python programmer? Thanks, Kent

18 years, 9 months

[linux-audio-user] xmms-jack 0.14

by joke＠apo33.org

Hi friends, I prepare an installation with 10 xmms playing soundfiles through jackd & ardour. I use the last xmms-jack 0.14 plugin but it seems to have a problem with the biojack, each time I launch a second xmms, biojack want to re-number as the first one and not give it a new biojack number... So I can't use different xmms at the same time. Did some of you used the plugin recently? I am trying to patch the bio2jack source to allow xmms to play multiple session at the same time and give a new biojack number... but I can't contact the programmer "Chris Morgan" (his email is protected from spam abuse, and it rejected my email...). So if someone has an idea, thanks for your help!! cheers julien APODIO : http://www.apodio.org

18 years, 9 months

[linux-audio-user] snd-mpu401 will not load in 2.6.12

by David Baron

Problem in -1, -2 and Demudi kernels. Is this going to fixed?

18 years, 9 months

[linux-audio-user] Some remarks about USB audio and low latency

by Clemens Ladisch

Playback and capture streams can never be exactly synchronized -- even if both use the same sample rate, packet sizes are not guaranteed to be the same. This means that it's possible to use smaller buffers with Jack by using only one direction (-P or -C instead of -d), if only one direction is needed. Due to synchronization issues with the host controller, stopping and restarting a stream will take several milliseconds. This means that it is often preferrable to use Jack's --softmode option to reduce the length of the gap when an underrun happens. The snd-usb-audio driver in CVS, or in ALSA 1.0.10rc1 (to be released Real Soon Now(TM)) has several improvements: - Maximum additional latency of captured data reduced to 1 ms (this was a bug in the earlier version). - Consistent handling of USB packets that go over the buffer boundary. Sample rates that aren't a multiple of 1000 now work just as well as sample rates that are. This affects programs (like Jack) that don't use a buffer size that is a multiple of rate/1000, too. - The nr_packs parameter can now be changed after the module has been loaded, e.g.: echo 1 > /sys/module/snd_usb_audio/parameters/nr_packs This change will take effect when a stream is started the next time. Regards, Clemens

18 years, 9 months

[linux-audio-user] Jack/LADSPA/RT-mixer-software?

by Aleksandr Koltsoff

Hello And very many thanks for all the c-port2000 answers, it's been some time that I've encountered this friendly mailing list :-). I'm looking for some simple software to accomplish the following: - do realtime monitoring(VU) and mixing - output mixed data for headphones-monitoring (using same card, I have the infamous st-audio rig, on which I didn't manage to get _any_ of the MIDI ports to work) - optionally route some of the input channels trough LADSPA plugins A Gtk+2 GUI would be much preferred to anything else. Has anyone seen such a beast? If not, how does this sound: - a jack client that will get the input data - will do the mixing and drive the stuff trough ladspa - output result using jack (this should be possible, only I skimmed trough some jack-related docs, difficult to get handle on it) - display VU/implement GUI for levels using GTK+ (2.x). Does anyone see any architectural problems with this approach? I'd guess that implementing mixing using a jackd plugin would be more efficient, but is it worth it and how to connect the controls to the GUI? ak.

18 years, 9 months

[linux-audio-user] midi and ecasound

by Dubphil

Hello folks, I have two midi controller connected to my UM-2 usb midi interface And I have a lot of trouble to figure out how to configure ecasound to use them. here is the aseqdump outputs : $ aseqdump -l Port Client name Port name 0:0 System Timer 0:1 System Announce 72:0 PHASE 26 USB(16/48) PHASE 26 USB(16/48) MIDI 1 80:0 UM-2 UM-2 MIDI 1 80:1 UM-2 UM-2 MIDI 2 if I want to monitor the first device (connected on the in 1 of the UM-2) this is what I mostly get : $ aseqdump -p 80:0 Cannot connect from port 80:0 - Resource temporarily unavailable sometimes it works, but it is absolutely not reproductible on the other hand, the second device (connected on the in 2 of the UM-2) is always working : $ aseqdump -p 80:1 Waiting for data. Press Ctrl+C to end. Source_ Event_________________ Ch _Data__ 80:1 Control change 0 1 69 80:1 Control change 0 1 70 but this information is useless to set up ecasound so I have tested with gmidimon. The approach is not the same as it uses /dev/midix or /dev/snd/midiCXDX the only device I can monitor is /dev/midi2 and /dev/snd/midiC2D0 (same device) and it gives me this information : Status Chan Data1 Data2 time Control(176) 0 1 54 1123881037 I suspect I can use this information in ecasound so when I run ecasound like that : # ecasound \ > -G:jack,ecasound,notransport \ > -Md:rawmidi,/dev/snd/midiC2D0 \ > -a:6 -i:jack \ > -ea:1000 -km:1,0,1000,176,0 -o:jack I hear no sound even if I tweek the channel 0 of the suitable device. If I remove the midi control : # ecasound \ > -G:jack,ecasound,notransport \ > -Md:rawmidi,/dev/snd/midiC2D0 \ > -a:6 -i:jack \ > -ea:1000 -o:jack I hear the sound I'm sure that the midi devices are all working because when I connect them to AMS or om-synth with qjackctl I can control everything with both devices. What am I doing wrong ? And why the midi monitoring is so erratic ? Thanks in advance for your help. Philippe

18 years, 9 months

[linux-audio-user] Multiple soundcard with Jack

by Jody Noury

Hi, I'm discovering Demudi live, I have setup a box with two differents sound cards (pci), both are working. I'm not familiar with jack, I believed that it could handle several sound output but can't see where to add the second card, It seems that I can switch between the two cards but not to have twice in jack patch bay. Is someone could light my mind ? :) Thanks, Jody

18 years, 9 months

[linux-audio-user] Re: [linux-audio-announce] [ANN] Mondrian Project

by Dave Griffiths

> > > All: > I would like to announce the Mondrian Project. Mondrian is an attempt > to create a text-based setting for writing and performing music. actually, the way we do pushing/popping note state with [] is exactly the same :) more up to date docs are here (long url alert): http://savannah.nongnu.org/cgi-bin/viewcvs/livenoisetools/livenoisetools/no… cheers, dave

18 years, 9 months

[linux-audio-user] open & free soundcard

by joke

Hi friends, for some days I was looking for some open & free hardware and specially soundcards. I find some informations about openhardware... but not really on the question of soundcard (some dac to build yourself). I would like to know if some of you guys using open & free soundcard and if not at least a way to do it yourself... or even if you know people who had a project to release some prototypes or have similar projects. I could be really great to use a gnu/linux plateform with so much & good free audio software and to use an open & free soundcard to record & play this sounds!! thanks for the help Julien

18 years, 9 months

[linux-audio-user] Test please ignore

by Bob

ignore bob

18 years, 9 months

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Linux-audio-user August 2005