On Sun, 27 Apr 2008 13:48:16 +0100 Oliver Lupton <oliverlupton@xxxxxxxxx> wrote: > Sergei Steshenko wrote: > > On Sun, 27 Apr 2008 13:29:11 +0100 > > Oliver Lupton <oliverlupton@xxxxxxxxx> wrote: > > > >> Sergei Steshenko wrote: > >>> On Sun, 27 Apr 2008 02:19:34 +0200 > >>> Rene Herman <rene.herman@xxxxxxxxxxxx> wrote: > >>> > >>>> mplayer/vlc will just set the rate itself when opening the device, to the > >>>> sampling rate of whatever PCM data it wants to play (as does aplay, if you > >>>> feed it a wav file which announces the sampling rate of the file in its > >>>> header). For recording, if those program can record, you'll be able to > >>>> specify the rate in some program-specific way. > >>> > >>> Doesn't make sense to me. > >>> > >>> Suppose in one console I'm playing something using 'mplayer' (a CD), so > >>> 'mplayer' wants to set sample rate to 44100Hz. > >>> > >>> At the same time in another console I'm playing something with 'vlc' (a DVD), > >>> so 'vlc' wants to set sample rate to 48000Hz. > >>> > >>> Obviously, the two are mutually exclusive. > >>> > >>> My understanding is that I as end user mandate the sample rate, and applications > >>> not liking my choice have to use resampling - I guess/hope ALSA will take care > >>> of this automatically. > >>> > >>> Regards, > >>> Sergei. > >> As I understand it, one of two cases applies: > >> > >> 1) Your card supports hardware mixing, and internally resamples > >> everything you throw at it to some common sample rate. Both mplayer and > >> vlc open the device at different rates, and the card mangles audio from > >> both of them to it's internal rate. > >> > >> I think the M-Audio control is allowing you to specify the internal rate > >> mentioned above, other cards (such as my Audigy 4) do not allow you to > >> configure the rate and always use 48000Hz (I believe). > >> > >> 2) Your card does not support hardware mixing, and you're using dmix to > >> supply software mixing. dmix/alsa resamples everything to a common > >> sample rate (specified somewhere in the alsa config) and outputs a > >> single mixed stream to the DAC. > >> > >> Disclaimer: I've not used any M-Audio hardware, and I'm not an ALSA expert. > >> > >> Hope this is vaugely helpful to someone. > >> > >> Cheers, > >> -ol > >> > > > > I still have the M-Audio, though not using it at the time. > > > > It does not support HW mixing, but allows me to set sample rate. > > > > Is there a way to lock sample rate ? I.e. to set it once and not to allow > > applications to change it, thus forcing them to use 'dmix' ? > > > > This is the behavior I want. > > > > Thanks, > > Sergei. > > I believe that is possible, yes. I think that you just have to configure > your dmix as the default device ( http://alsa.opensrc.org/index.php/Dmix > ) and specify the dmix rate as your chosen global rate. Set the M-audio > control to that rate as well, and I think you should have what you want. > > Usual disclaimer applies I'm afraid (and I'll send it to the right > address this time) > > Cheers, > -ol > Should I also consider "asym": http://alsa.opensrc.org/index.php/Asym ? ... Is this: http://gentoo-wiki.com/HOWTO_ALSA_sound_mixer_aka_dmix#cmedia_8738_and_Analog_Devices_AD1980 about right for my laptop with AD1981 ? Thanks, Sergei. ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
