On Fri, 22 Feb 2013, Daniel Mack wrote: > Hi Chard, > > On 22.02.2013 11:48, Chard wrote: >> I need to specify an arbitrary sampling rate via the tlv320aix3x codec. >> However, on examination of the driver code, it appears that the code is >> hard-wired to only accept rates of 44.1kHz and 48kHz - or >> multiples/divisors of those 'standard' rates. The fs(ref) is snapped to >> one of those rates. What is your sound card? Are you sure that your card actually supports those other rates in hardware? Other rates might be supported by resampling the signal rather than the hardware actually running the A/D or D/A at those other rates. In that case, doing software resampling might give better results for you (Ie, record or play at the set hardware rates, and use say sox to resample. See my comments on resampling in www.theory.physics.ubc.ca/www.theory.physics.ubc.ca/soundcard/resample.html You can get pretty bad results by bad resampling and soundcards want to be quick, not accurate in their resampling. ) >> >> As a work-around, I've rebuilt the driver by hard-coding register values >> that achieve my desired sampling rate. >> >> I'd be interested to know if there is a particular reason why the driver >> has been limited in this way. Is it just that there has not been a >> requirement for anything else to date? > > I think the reason is just that - as usual - drivers are written for a > particular use case, and if someone needs to have it differently, > patches are always welcome. > > Can you come up with an algorithm that produces the same register values > that the current code for all the currently supported standard rates and > which also works for your special case? > > If so, please cook a git patch and send it to the alsa-devel list. Also > make sure to Cc: the maintainers, contributors and original authors of > the drivers (use scripts/get_maintainer.pl to get a list of relevant > people) and please read Documentation/SubmittingPatches in case there's > anything in there that's new to you :) > > > Thanks, > Daniel > > > ------------------------------------------------------------------------------ > Everyone hates slow websites. So do we. > Make your web apps faster with AppDynamics > Download AppDynamics Lite for free today: > http://p.sf.net/sfu/appdyn_d2d_feb > _______________________________________________ > Alsa-user mailing list > Alsa-user@xxxxxxxxxxxxxxxxxxxxx > https://lists.sourceforge.net/lists/listinfo/alsa-user > -- William G. Unruh | Canadian Institute for| Tel: +1(604)822-3273 Physics&Astronomy | Advanced Research | Fax: +1(604)822-5324 UBC, Vancouver,BC | Program in Cosmology | unruh@xxxxxxxxxxxxxx Canada V6T 1Z1 | and Gravity | www.theory.physics.ubc.ca/ ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_feb _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
