Hey Pilo, I do everything from the gui, so while we /should/ be having the same results that doesn't mean we /will/, you know? I use qjackctl for jack and envy24control (from alsa-tools) for setting the card params. Just another random thing that might inexplicably solve it (happens all the time.) Apparently, qjackctl is doing this for me: /usr/bin/jackd -R -P27 -p128 -dalsa -r48000 -p256 -n4 -D -Chw:M2496 -Phw:M2496 -R is for realtime, -P sets priority, -p is port max; alsa driver options -p period -n #periods -D duplex, then card names... I can't see anything that should be making mine do the sample rate right and yours not... Doing my usual shotgun debugging I'd try jackd -d alsa -r 44100 -C hw:M2496 -P hw:M2496 with wherever yours is at for M2496. Seriously I'm just guessing though. Also, are you sure you're not resampling during export in ardour? I made that mistake once, but I'd hope the default is what the project is in... Good luck, Walker On Tue, 23 Feb 2010 10:24:59 +0100 Pierre-Laurent CHAMBERT <pierrelaurent.chambert@xxxxxxxxx> wrote: > Hi Walker, > > Thanks for your answer! > > Maybe I'm doing something wrong? > I run jack using : > jackd -d alsa -r 44100 > > then > > pilo@pilo:~/schematic$ cat /proc/asound/card0/pcm0p/sub0/hw_params > access: MMAP_INTERLEAVED > format: S32_LE > subformat: STD > channels: 10 > rate: 44100 (44100/1) > (...) > > So when I run ardour, it uses 44100Hz for project sample rate. But, > most of the time, alsa seems to assume that the output freq is > 44.1Khz, but "requested" freq is 48Khz, and so resample the sound > (which is then faster and higher in pitch as it would be). > > Sometimes it works (for example when jack is the first one to use the > sound card). The same trouble when I use a software which use oss > emulation.... > > I really don't know what to do, I would prefer that alsa does no > resampling at all! > Last time a friend send me drum tracks @44.1Khz, I play bass on > those, and when I sent them back to him he told me "ouaw! you are > tuned very low!", and I was not, that's how I discover there was a > trouble with SR. > > I try to play with .asounrc, by forcing Sample rate, but this doesn't > work. And I wonder what would happen if I use the spdif in and out > with this frequency trouble.... > > Anyway, thank you! > > Pilo. > > > > Hey, > I'm using that card (with jack and ardour even), but I'm not an > alsa-expert. Just guessing, but do you have jack set to run at 44100? > Jack seems to override whatever other ways you've set the sample rate. > > Bigger problems with that card and alsa seem to be that you need to > set .asoundrc for it to work with certain apps, and even then it seems > to have problems if you're running pulse to alsa to it, or even > without it sometimes crashes. Not with any jack app, of course, just > other apps, I mean. > > Walker > > On Sun, 21 Feb 2010 12:02:31 +0100 > Pierre-Laurent CHAMBERT <pierrelaurent.chambert@xxxxxxxxx> wrote: > > > Hi everyone! > > > > I'm using an audiophile 2496 with alsa to do some pro audio working, > > mainly with ardour and jack. > > Unfortunately, I have a big problem with alsa : (automatic) > > resampling! > > > > Most of the time I can't work on 44100Hz project, even if I run > > jackd with a 44.1Khz freq, the card internal clock is at 44.1Khz > > (accord to /proc/asound info), but the sound is resampled just like > > if the card run @ 48Khz... and so the sound is faster and higher > > (impossible to work with). I don't understand how the resampling > > works in alsa, is there anyway to turn it off? > > When working at 48Khz it seems to always be fine... > > It is a real issue, and I can't really find useful info about it. > > > > By the way, in alsa 1.0.22 driver, ice1712 module (used for > > Audiophile 2496) is missing! (the source code is here, but no module > > is not compiled, whatever options is turned on during compiling). > > > > Thank you very much! > > > > Pilo ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
