At Tue, 04 Mar 2008 17:57:15 +0000, James Courtier-Dutton wrote: > > Takashi Iwai wrote: > > At Tue, 4 Mar 2008 15:03:15 +0000, > > James Courtier-Dutton wrote: > >>> > Now that we have these dB gain levels, we could potentially set all > >>> > mixer controls to 0dB, i.e. not gain and not attenuation, with only > >>> > the master output control being set to a lower value so as to avoid > >>> > ears breaking. > >>> > >>> > >>> I don't know where the master output control is. Do you see it in the > >>> outputs of 'amixer' or 'amixer contents' I provided in one of my > >>> previous messages? > >>> > >> version 1.0.16 of amixer will have the dB values. > >> You also have to have version 1.0.16 of alsa-driver and alsa-lib. > > > > hdspm driver still doesn't support TLV dB information. > > In addition, rme9652/hdsp/hdspm drivers use control elements in a > > non-standard way for indirect accessing, so each mixer value isn't > > visible in amixer or alsactl. > > > So, in that case mapping values from 0 to 65536 to gain values is not > yet done for you. You will have to find some other method to convert > them to gain values, and as the driver does not document the mapping, > you probably have to use trial and error or look at a datasheet if they > exist. 32768 = unity gain is found in hdspm.txt. But the actual dB level to be applied for other values isn't mentioned there. Takashi ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
