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by anwe79
Sat Jun 15, 2013 12:56 pm
Forum: Graphics, sound and multimedia
Topic: RPi and real-time, low-latency audio
Replies: 189
Views: 74109

Re: RPi and real-time, low-latency audio

Thanks for the help AutoStatic and others. I'd given up on Jackd on the Pi for a while, but now I'm up and running. I got the source of jackd from debian experimental, (which contains a patch to disable the problematic code), disabled dbus in the config and built it with dpkg-buildpackage. It was qu...
by anwe79
Tue Jul 31, 2012 7:45 pm
Forum: Raspbian
Topic: raspbian kernel alpha
Replies: 16
Views: 6215

Re: raspbian kernel alpha

Just to let you know (not sure if this is the right place for it), I'm getting errors when installing: Setting up linux-image-3.2.0-3-rpi (3.2.21-1+rpi1) ... Running depmod. Error setting debconf substitutions in linux-image-3.2.0-3-rpi/postinst/missing-firmware-3.2.0-3-rpi: Unsupported command "rem...
by anwe79
Tue Jul 03, 2012 11:04 pm
Forum: Other projects
Topic: Rassberry Pi and Jack audio
Replies: 70
Views: 54550

Re: Rassberry Pi and Jack audio

Well, i just wanted to let you know that i'm having trouble starting jackd even with a standard usb device. I bought this cheap little sound dongle, and it works well with alsa, but not with jackd. With jack2 i get: Cannot lock down 82274202 byte memory area (Cannot allocate memory) Bus error I do h...
by anwe79
Sat Jun 30, 2012 8:50 am
Forum: Other projects
Topic: Rassberry Pi and Jack audio
Replies: 70
Views: 54550

Re: Rassberry Pi and Jack audio

Ok, yeah i guess one of those would need special drivers to work, not a bog standard class-compliant device that one. There is hope though, according to the link below, there is a working linux driver: http://old.nabble.com/State-of-Edirol-UA-101---td28483748.html I have no clue if that module is av...
by anwe79
Fri Jun 29, 2012 9:20 pm
Forum: Graphics, sound and multimedia
Topic: jackd ?
Replies: 2
Views: 1993

Re: jackd ?

If you have a usb sound card, you may want to try jackd1 (jackd2 is installed by default, at least on debian, if you install the jackd pseudo-package).

Regarding the built in sound it's sadly a no go, see this topic.
by anwe79
Fri Jun 29, 2012 9:15 pm
Forum: Other projects
Topic: Rassberry Pi and Jack audio
Replies: 70
Views: 54550

Re: Rassberry Pi and Jack audio

Yep, i just learnt that the hard way :). Tonight i set up a raspbian install and tried both jackd2 (which complains about not being able to lock memory) and jackd1 which gave me a more useful error about not being able to use mmap access. So this is a no go with the built in sound and current driver...
by anwe79
Thu Jun 28, 2012 9:40 pm
Forum: Linux Kernel
Topic: does the wheezy beta kernel have PREEMPT??
Replies: 16
Views: 7148

Re: does the wheezy beta kernel have PREEMPT??

Hi, i have a similar interest, partly for audio work (which doesn't require hard RT) and partly because i want to try to use a Pi for controlling a reprap. I haven't tried the wheezy image yet, but just downloaded it, and will have a look tonight. I am running an audio-"RT" 3.2 kernel on my desktop ...
by anwe79
Thu Jun 28, 2012 9:11 pm
Forum: Debian
Topic: sudo apt-get destroy?
Replies: 8
Views: 3222

Re: sudo apt-get destroy?

I had another look at the output and it seems very strange. Why does it want to install a bunch of exim4 packages? Something is definitely wrong, don't go ahead with those changes... Use aptitude to reset the "pending changes" (i forget the exact words, it's in the menu , F10). That clears any pendi...
by anwe79
Thu Jun 28, 2012 8:55 pm
Forum: Debian
Topic: sudo apt-get destroy?
Replies: 8
Views: 3222

Re: sudo apt-get destroy?

I haven't looked at the details, but knowing apt, this is a dependency problem. Something you are installing ( or some of the depencies) is causing a conflict. It could be some package foo needs package bar version >= x, while package baz needs the same package bar but version < x. Or some packages ...
by anwe79
Thu Jun 28, 2012 10:59 am
Forum: Graphics, sound and multimedia
Topic: Noise at front of audio playback
Replies: 49
Views: 31888

Re: Noise at front of audio playback

Dito, I tried alsaplayer which works (with some minor pops, but i don't hink i have that latest update), aplay seems to be broken.
by anwe79
Thu Jun 28, 2012 10:44 am
Forum: Other projects
Topic: Rassberry Pi and Jack audio
Replies: 70
Views: 54550

Re: Rassberry Pi and Jack audio

I just got my pi yesterday and have started trying some audio stuff. Alsa seems to work, although is still a bit glitchy (aplay is very noisy, alsaplayer works better but with some pops). I've tried getting jackd to run, but haven't got all the way yet. It starts, but doesn't seem to initialize prop...
by anwe79
Fri Dec 23, 2011 12:20 am
Forum: General discussion
Topic: There are some VERY INTERESTING pics on the front page right now...
Replies: 34
Views: 5449

Re: There are some VERY INTERESTING pics on the front page right now...

<t>I may well be wrong about the connectors (hope so), that\'s just from what I\'ve read around the forum and wiki. From what I understand the camera module won\'t be shipped initially, but that may well have changed, I haven\'t got any inside info.<br/> <br/> Ps I just posted this to slashdot. Alth...
by anwe79
Thu Dec 22, 2011 11:24 pm
Forum: General discussion
Topic: There are some VERY INTERESTING pics on the front page right now...
Replies: 34
Views: 5449

Re: There are some VERY INTERESTING pics on the front page right now...

<t>Nice, seems like the release date is just round the corner!<br/> <br/> @matt_heyes: I may be wrong, but i think those flat cable connectors will be omitted from the final boards, for cost reasons. Very few people would have practical use for them (you couldn\'t plug a normal laptop display/camera...
by anwe79
Sun Dec 18, 2011 11:49 pm
Forum: Other projects
Topic: Risc OS / Beginner OS
Replies: 32
Views: 4768

Re: Risc OS / Beginner OS

<t>As long as you teach the kids that all computer UI's are abstractions i don't think it really matters exactly how many layers of abstraction there are. I'd say it matters more whether you could easily find help online when you get stuck.<br/> <br/> I'm not British, but I'm not from that far away ...
by anwe79
Wed Dec 14, 2011 11:46 pm
Forum: Staffroom, classroom and projects
Topic: Learning computer fundamentals
Replies: 4
Views: 1755

Re: Learning computer fundamentals

<r>I don't know about this Gibson fella, or if he's controversial or not, but being taught how a computer works from the ground up is very, very enlightening.<br/> <br/> I studied a course at uni that taught exactly this, and it was hands down the most interesting one i've taken so far. We never del...
by anwe79
Fri Dec 09, 2011 11:24 pm
Forum: General discussion
Topic: Adobe discontinuing Flash for mobile
Replies: 46
Views: 8104

Re: Adobe discontinuing Flash for mobile

<t>The only thing nice about flash was the drawing tool (in the ide), that would smooth my utter inept atempts at waveing the mouse around in an artistic fashion. Very happy it\'s going away. Video is about the only thing it\'s useful for, and that seemed to be a bit of kluge anyway.<br/> <br/> Btw ...
by anwe79
Fri Dec 09, 2011 6:13 pm
Forum: General discussion
Topic: Clustering
Replies: 25
Views: 7187

Re: Clustering

<t>This is probably a stupid idea, and i know next to nothing about the interfaces, but could we not abuse the CSI/DSI ports to connect Pis together?<br/> <br/> From what little i've gathered these are basically unidirectional, point to point, high speed, serial buses for cameras/displays. I'm not s...
by anwe79
Wed Dec 07, 2011 12:29 am
Forum: Staffroom, classroom and projects
Topic: Bash - Programming
Replies: 30
Views: 7402

Re: Bash - Programming

<t>Yep, i think this may be a good idea, if only to spark some interest in what you can actually do with a computer (other than web browsing and play games:)). Although i wish there were a better option than bash (i'm not very familiar with the other shells, but i supect they are not that much bette...
by anwe79
Tue Dec 06, 2011 11:57 pm
Forum: Staffroom, classroom and projects
Topic: RasPi as a basic school desktop replacement
Replies: 104
Views: 28595

Re: RasPi as a basic school desktop replacement

<r>Sorry for OT but; I have to disagree with this: "Yes there are a lot less malcode variants in existence for Linux but that does not mean that Linux machines do not very commonly become infected as unfortunately they do". This depends alot on how you define "very commonly".<br/> <br/> I don't have...
by anwe79
Tue Oct 25, 2011 10:45 pm
Forum: Other projects
Topic: Guitar amp modelling
Replies: 25
Views: 14099

Re: Guitar amp modelling

<r>An el-cheapo USB-card is definitely the easiest way to get an input and I'll use one for starters, but i want to explore the possibilties of adding an ADC module, for the challenge if nothing else <E>:)</E>.<br/> There is an I2S-bus, so adding an ADC seems straightforward, at least hardware-wise....
by anwe79
Mon Oct 17, 2011 9:59 pm
Forum: General discussion
Topic: Why not VGA port on the Rpi ?
Replies: 25
Views: 4676

Re: Why not VGA port on the Rpi ?

<t>If a cheap display is all you\'re after, pick up an old crt-tv with composite in. Around here (sweden) you could get one of those for next to nothing, people are throwing them away.<br/> <br/> If you have a flatscreen with no composite input, get an old vcr with one. That would most likely be fre...
by anwe79
Thu Oct 13, 2011 5:31 pm
Forum: Other projects
Topic: Guitar amp modelling
Replies: 25
Views: 14099

Re: Guitar amp modelling

<r>@jzu: Cool project! I don't know much about USB-audio on linux, but i'll give it a stab anyway...<br/> I know there are quite a few "semipro" or pro audio interfaces that use USB with reasonable latencies. According to <URL url="http://alsa.opensrc.org/Usb-au....._latencies">http://alsa.opensrc.o...
by anwe79
Tue Oct 11, 2011 10:06 pm
Forum: Other projects
Topic: Guitar amp modelling
Replies: 25
Views: 14099

Re: Guitar amp modelling

<t>Oh, btw, that might all beside the point anyway... Many "pro"-audio sound programs on linux (guitarix for one) depend solely on jackd for input/output. Using them on bare-metal alsa would probably mean the input/output parts would need to be rewritten or overhauled, which is probably a bit beyond...
by anwe79
Tue Oct 11, 2011 9:34 pm
Forum: Other projects
Topic: Guitar amp modelling
Replies: 25
Views: 14099

Re: Guitar amp modelling

<t>Not sure how good alsa is with latency, thats where jack really shines, but since its dedicated the story might be different here... Low latency is critical for this though, more than say 10 ms is definitely noticable and affects your playing.<br/> <br/> Although since jack would run on top of al...
by anwe79
Sun Oct 09, 2011 1:39 pm
Forum: Other projects
Topic: Guitar amp modelling
Replies: 25
Views: 14099

Re: Guitar amp modelling

<r>I'm glad you like the idea <E>:)</E><br/> Sorry, I have no idea what kind of fp performance is needed.<br/> From "top" i can see that guitarix standalone consumes about 12-15 % cpu on a core i5-2405S (running all cores at 1,6Ghz, ondemand scheduler). What proportion of that is fpu i can't tell wi...

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