On Thursday 12 December 2019 21:42:27 Luiz Augusto von Dentz wrote:
> Hi Pali,
> 
> On Thu, Dec 12, 2019 at 7:31 PM Pali Rohár <pali.rohar@gmail.com> wrote:
> >
> > Hello!
> >
> > According to HSP 1.2 specification, section 4.7 Remote Audio Volume
> > Control, Support for remote audio volume control is optional, so an
> > implementation may support none, either, or both of the controls for
> > microphone volume and speaker volume.
> >
> > According to HSP 1.2 specification, section 5.3 SDP Interoperability
> > Requirements, bluetooth device with HSP profile announce via SDP "Remote
> > audio volume control" field information if device itself supports volume
> > control.
> >
> > But currently I did not found any way how to access "Remote audio volume
> > control" SDP field in (pulseaudio) application as bluez does not export
> > it.
> >
> > Can you please export this field? E.g. for HFP profile all optional
> > features from SDP are passed to NewConnection() DBus method via
> > fd_properties dictionary under Features key. Could you export that
> > "Remote audio volume control" bit for HSP profile in Features key?
> >
> > And in same way, this needs to be handled also in RegisterProfile() DBus
> > method.
> 
> Do you have a use case in mind?

Yes, checking in pulseaudio if remote side announce that supports remote
volume control or not. And based on this switch to software volume
level.

-- 
Pali Rohár
pali.rohar@gmail.com