Native Development

[hjt]

The audiomixer.h listed a set of input channel related functions:

   audiomixer_set_input_level()

   audiomixer_adjust_input_level()

   ...

But   'Speaker' , "Headphone', and 'A2DP' channels all reported t not to  have INPUT support (from the audiodevice_detailed_t ).   Are those input related functions are real?   If yes,  then they apply to which audio channel(s)?     

Also,  in the system setting for Sounds and Notification,   there is a on/off toggle for  the Headphone Audio Boost.  Does anyone know how it this done using any of the published ndk API?   Thanks.

[jhoffmann · Accepted solution]

The audiomixer input functions apply to those channels for which audiodevice_details_t.input is true, e.g. HEADSET, HANDSET, BTSCO (bluetooth headset), etc.

There is no way to adjust the Headphone Audio Boost from the NDK.  It is a user option only.

[hjt]

Thanks for your insider information!