At Wed, 23 Aug 2006 17:31:10 +0200, I wrote: > > > So, 0 dB is when (volume - rec->min) / (max - min) == 1 > > So, for +6 dB gain, the volume will need to be higher than max? > > Does this sound right? In that case, maybe "max" is not a good name for > > it because volume can be greater than max. > > Hm, right, I didn't think of overload case with a linear volume > codec. By min and max, I thought of a "segment" between mute and > 0dB (although not implemented rightly in alsa-lib). > > Maybe min and max should be in (0.01) dB expressions since the min and > max "values" are known from snd_ctl_elem_info. The only problem is > that we have no standard definition of "mute" in dB expression. > In alsa-lib, -9999999 indicates mute. But it should be defined as a > constant in a public header. It turned out that minimal dB makes the computation too complicated, and chips are very likely from mute to a certain dB. So, I decided to drop the min dB there. The below are the revised patches. Takashi
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