On 11/22/21 5:38 AM, Tim wrote:
Thanks Alan - I do agree it isn't a custom feature. The subsystem has "Feature Units"
which includes "AUDIO_FU_EQUALIZER" as a control. This doesn't seem to be implemented for
any processors or boards that I can see, nor is there any generic code for this; just the #define
in include/audio.h.
My thinking now is perhaps to add some sub-feature #defines (e.g.
AUDIO_FU_SUBEQUALIZER_BASS_BOOST_PLUS6) to be used as subtypes when capabilities are
queried for AUDIO_TYPE_FEATURE and for the audio_configure function to make use of. As
far as I see no drivers or apps currently support AUDIO_FU_EQUALIZER so it's unlikely
anything will get broken doing this, but it will allow me to make use it
"properly".
Something like that, anyway!
Hey Tim,
You are correct that AUDIO_FU_EQUALIZER feature is not implemented
anywhere. There are probably several other "features" that are also not
implmented. When I added the audio subsystem circa 2014, I defined the
header files and structures to be extensible even before implementing
the first actual audio device. That way I could determine if I had the
needed control in the structures for expandability. In creating those
headers, I included audio features present in USB type audio devices
(which I was using as a reference), and that is why the feature is
present but not implemented.
Ken
