Linux-audio-user January 2005

linux-audio-user@lists.linuxaudio.org

207 participants
246 discussions

Re: [linux-audio-user] xmms-jack and 44100/48000 resampling

by mchristoph.eckert＠t-online.de

> as documented, xmms-jack should automatically resample a > stream if an MP3 file has a sampling rate different from > what jackit requests. On my system (SUSE 9.2 professional > w/ jack-0.98.1-5, xmms-jack-0.9-4 and xmms-1.2.10-56) this > appears to work only when the MP3 is 48k and jack runs at > 44100, not the other way. So, what about a bug report? The project page of the jack plugin for xmms is: http://sourceforge.net/projects/xmms-jack/ I once filed a feature request on the project page, and it has been done in a very short time, thanks to the maintainers :) . Best regards ce

20 years, 2 months

[linux-audio-user] Re: FreeWheeling live looper prerelease

by JP Mercury

Folks, Thank you, Philippe, Wolfgang, Spencer, for your kind words. > it works great for me with my TB303. I find this soft amazing and > very intuitive, already adopted and will stand a big place in my > music toolset :) > > Philippe When you have a chance, send me some music. I like hearing what people make with Linux. > jp, the energy and thought you have put into this are truly > glamorous. Much in the same way that Fons Adriaensen's unique work > (http://users.skynet.be/solaris/linuxaudio) inspires gleeful things > you've added a beautiful instrument to the band. Oh, what am I > telling you, you know this. Yes, I played pipe organ for my family on New Years with Fons' amazing Aeolus. What an amazing instrument that is. Another round of questions- > > Not sure what you mean by trim loops. Do you mean how to sync up many > > loops together? > > Yes. I wondered if you could get rid of parts of a loop or change > start/end of a loop -- in order to sync up. I read the "loops with > different lengths can be captured and triggered at once" on your > website so I fiddled with "pulses" but got nowhere. > fweelin_core_dsp.cc says there is a metronome. How do you get to > hear it? OK, here's the scoop. Record a loop. Press F1 and a new pulse is created based on that loop. The timing and downbeat of the pulse, and all subsequently recorded loops, will match the original loop. So you'll want to press F1 after you record a loop that has an important beat. I often start with drifting loops and then when the timing comes to me I create a pulse. Now that you have a pulse, you should see a piegraph '1' on the upper right part of the screen. If you record another loop, you'll see that the timing fits into the pulse. Your record will start at the nearest downbeat and will last for a whole number of pulses. Currently, you can't subdivide pulses, so you'll have to record at multiple lengths of your original loop. > fweelin_core_dsp.cc says there is a metronome. How do you get to > hear it? It's currently undocumented and unconfigurable. Record a pulse and press F11. > > There is no way to pan loops right now. Freewheeling currently runs > > all loops mono. I recognize the limitation- it's a good idea for a > > future release. > > There's more to panning than balancing between 2 channels though. > There might be n jack channels to pan to. Yup. Multi channel loops and outputs are on the table for an upcoming release-- the framework is there but I'd like to collect more user feedback first. > > > MEM: HiPri Thread 0 > > > fweelin: pthread_mutex_lock.c:78: __pthread_mutex_lock: Assertion > > > `mutex->__data.__owner == 0' failed. Aborted > > owner "0" would be root so maybe Spencer runs jackd as root and > fweelin can't connect being run with Spencer's user rights. If so he > would have to run fweelin as root too -- which is bad -- or go > 2.6/lsm or > 2.4/capabilities/jackstart respectively. > > Wolfgang Spencer writes- > I'm running 2.6 with the realtime LSM module, with my user in the > audio group. I'm running qjackconnect and fweelin both with my > non-root user. If I remember my c++, an assertion intentionally > causes an error in the program when a condition isn't met, right? > So maybe the program thinks I should be root? Thanks for the response. > > -spencer That is baffling. It seems to be when initializing the memory allocation thread mutex: pthread_mutex_init(&inst->mgr_thread_lock,0); pthread_cond_init(&inst->mgr_go,0); pthread_mutex_lock(&inst->mgr_thread_lock); Though I confess that I usually run as root, I tested fweelin as non-root and it worked on this machine. Spencer, I know it's horrifying, but have you tried running as root? One other thing you might try, go to fweelin_core.cc and find: // Memory manager mmg = new MemoryManager(); Add directly after: sleep(5); It should pause noticeably when loading, but if this fixes the error, then my guess is it's a threading issue- are you running an SMP machine? Good luck! -- Michal- > ok, now I'm getting this: > > OKIE DOKIE, KIDDO! > VIDEO: SetVideoMode: Using 16-bit color > Xlib: unexpected async reply (sequence 0x36)! > > and nothing happens afterwards. On a couple of tries am empty window > actually poped up but that was it. > > ./MiS This seems to be a video threading issue, and I've already had some headaches with threading in my startup and exit code. Here are some suggestions-- go to src/fweelin_videoio.cc and find: videoflags = SDL_HWSURFACE; replace with: videoflags = SDL_SWSURFACE; Also in fweelin_videoio.cc, try replacing: inst->SetVideoMode(0); with: sleep(1); inst->SetVideoMode(0); sleep(1); Good luck! Thanks for all your feedback, -JP Mercury

20 years, 2 months

[linux-audio-user] getting linux music on Satellite TV

by Brian Redfern

Hi guys, here's an exciting news flash, I just recently got hooked up to do the soundtracks for a show called 'Street Fury', and just completed my first all-linux soundtrack for the show. Its just gotten purchased by TechTV, so soon you'll start to be able to hear regular linux audio on the show, I use csound and terminatorX (and will soon use muse and ardour as well, when I upgrade to my new machine). I'll let you guys know when the DVD is out, and where you can get it. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

20 years, 2 months

[linux-audio-user] Pushing emu10k1 performance

by Antonio

I Guys, I'd like to see what are the best latency performance now obtainable with an audigy oem with a recent system. I run Demudi, and I can run out-of-the-box jack 2x512 at 48000 very well with very rare xruns only when I open or close pd. On the contrary running jack 2x256 at 48000 (which would be optimal for the latency) gives me an xrun each some minutes, and is indeed not suitable for recording. To the one among you who have a such card, what performance do you have? I have to use a particular alsa-jack-kernel combination? Is there any work in progress to improve the latency of the emu10k1? As other said is very cheap entry-level card, suitable for amateurs, would be nice running it at hardware-limited latencies. Thanks and regards, - Antonio

20 years, 2 months

[linux-audio-user] Evolution UC-33

by Aengus Martin

Hi, is the evolution UC-33 MIDI controller supported by ALSA? The UC-16 is but....? thanks, Aengus _________________ Aengus Martin

20 years, 2 months

Re: [linux-audio-user] recommended music

by Brian Redfern

Gerald Wenzel does some very cool csound/linux music: http://apspec.com/pages/gerald.shtml __________________________________ Do you Yahoo!? The all-new My Yahoo! - Get yours free! http://my.yahoo.com

20 years, 2 months

Re: [linux-audio-user] Audio interface recommendations

by JP Mercury

On Thu, 13 Jan 2005 19:57:41 -0500, Jon B wrote > Recommendations so far: > > 1. Echo Indigo I/O > > Looks good. Only thing I'm worried about is the converters being > inside the computer. Is it really well-shielded and flat noise > floor? I guess if there's some whine but it's *much* lower than a typical > sound card, I could live with that. They look pretty inexpensive, > regardless. $180 or so. Maybe I should just get one and try it. The converters in the Indigo sit just outside the computer. The card plugs in and the converters/amplifiers/jacks stick out about an inch from the CardBus slot. Here's a picture: http://www.stereophile.com/images/archivesart/1104indigo.1.jpg The sound quality I have found to be very quiet, even at high gain- definitely a cut above any internal PCI sound cards I have heard. Here's an article that talks about Indigo's sound quality: http://www.extremetech.com/article2/0,1558,1325716,00.asp > > They deliver real-time performance at 96kHz, 24 bit > > down to 32 samples. > > By "down to 32 samples" are you talking buffer size? Is this what > JACK calls "frames/period"? Yup. Your latency is "frames per period" / sampling rate. > So PCMCIA is definitely capable of low latency, comparable to an > internal sound card? (Comparable to PCI, I guess?) It seems to be less an issue of the bus (PCI vs PCMCIA) and more an issue of how the hardware is configured-- IRQ assignments, DMA on disks, kernel tweaking, etc. For me, portable low latency was the deciding factor for going with the Indigo IO and it has paid off. > I am looking for something in between these in price range. $300 or > so. The Indigo would probably be ok, but maybe better than that... > Is there anything with MIDI, too? I haven't learned enough about > MIDI interfaces to understand the kind of latency involved, or used > it very much with ALSA, but something that could handle both at low latencies > would be great. (Or two separate things, but I only have one PCMCIA > slot.) I have a Midisport 1x1, but it has bad latency in windows, > and I haven't bothered to figure out how to get it working in Linux. Your latencies in MIDI are going to come mostly from the transmission protocol itself. It uses a slow data rate, so it'll always have millisecond latency. Good Luck, -JP Mercury

20 years, 2 months

Re: [linux-audio-user] Audio interface recommendations

by Jon B

>>I use an M-Audio Delta 1010 at home: 8 inputs and outputs for 1/4" balanced TRS or unbalanced TS plugs, __and__ MIDI in/out. The digital-to-audio and audio-to-digital converters are in the rack-mounted breakout box, as well as all of the inputs and outputs except for the S/PDIF input/output which is on the PCI card. Don't forget this is for a laptop. Should have said it in the subject line, I guess...

20 years, 2 months

Re: [linux-audio-user] Audio interface recommendations

by Jon B

Recommendations so far: 1. Echo Indigo I/O Looks good. Only thing I'm worried about is the converters being inside the computer. Is it really well-shielded and flat noise floor? I guess if there's some whine but it's *much* lower than a typical sound card, I could live with that. They look pretty inexpensive, regardless. $180 or so. Maybe I should just get one and try it. > They deliver real-time performance at 96kHz, 24 bit > down to 32 samples. By "down to 32 samples" are you talking buffer size? Is this what JACK calls "frames/period"? > USB works well, but most people have to really coax it to get it working with > lower latencies. That may change with USB 2.0 support coming for new cards, > but I'd hold off for now. Yeah, that is the experience I had with the Edirol and M-Audio I tried. Usable, but I can do better... I was looking at FireWire devices, but if they aren't supported in Linux yet, I'll hold off on that, too. So PCMCIA is definitely capable of low latency, comparable to an internal sound card? (Comparable to PCI, I guess?) 2. Echo Mona/Layla/Gina/Darla/other girl names Looks good, but a little overkill. The newer smaller ones would be great, but don't have the PC card interface. Layla24 $550 Mona $650? PC card $200 If the Gina 3G had a PC card (that didn't cost 10 times its components) and was well-supported, I would get that. Or something like M audio's Firewire 410 or Firewire Audiophile. That is the range I am looking at. 3. > RME HDSP Multiface - you won't ever look back. Linux support is superb. Looks good, but overkill. I can't imagine I would need all those ins and outs. Maybe in 5 years I will, but I will also be able to afford it more easily then. $650 for the multiface and $300(!) for the PC card. I am looking for something in between these in price range. $300 or so. The Indigo would probably be ok, but maybe better than that... Is there anything with MIDI, too? I haven't learned enough about MIDI interfaces to understand the kind of latency involved, or used it very much with ALSA, but something that could handle both at low latencies would be great. (Or two separate things, but I only have one PCMCIA slot.) I have a Midisport 1x1, but it has bad latency in windows, and I haven't bothered to figure out how to get it working in Linux. Why do they make things that go up to 96 kHz but with frequency response cut off at 20? I don't get it. I would love to be able to record ultrasound for like science experiments or for maintaining all audible frequencies when slowing sounds down. And audiophiles think they can hear it. Sounds like the manufacturers would want to have it go up to at least 35 or so in their interfaces, but nooo... Maybe I should just make my own...

20 years, 2 months

[linux-audio-user] [OT] DIY Racks

by Spencer Russell

So, I'm the proud new owner of a rackmount computer, with rackmount LCD monitor purchased off of eBay. I'm hopefully soon to be the owner of an equally snazzy rackmount multichannel I/O. I am not, however, in posession of a rack in which to mount my new toys. So I'm thinking of building one myself. Especially because I'd like to have one that accomodates the monitor as well as the gear, and an eventual rackmount mixer, and I haven't seen one that would organize things in a usable way. Has anyone built their own racks before? It doesn't seem too complicated, but I thought I'd see if there are any common pitfalls I might miss. The hard part is going to be trying to make a roadworthy rack, but I might leave that as a separate project, once I get this under my belt. If anyone has any ideas on a DIY road rack, they'd be appreciated. Thanks! -spencer

20 years, 2 months

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Linux-audio-user January 2005