2010/5/20 James Courtier-Dutton <james.dutton@xxxxxxxxx> > On 19 May 2010 17:34, Sebastian H. <vand2@xxxxxx> wrote: > > > > Hello everyone > > > > I'm working on an ALSA-Mixer application for C++/Qt4 and stumbled over > > volume and decibel mapping for sliders. > > My question: Is there always an 1 to 1 mapping from volume to decibel and > vice > > versa or can there be decibel values in between two volume steps? > > > > There should be a one to one mapping. > If the hardware has 200 steps on the volume scale, and those 200 steps > are published to the user. > With the dB scale, there will still be the same 200 steps in the dB scale. > The dB information simply helps the user interface convert each step > into a dB value. > a stepping function is not continuous and this is why snd_mixer_selem_set_playback_dB() cannot set decibel values in between two volume steps _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
