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Date:   Fri, 13 Dec 2019 00:03:14 +0100
From:   Pali =?utf-8?B?Um9ow6Fy?= <pali.rohar@gmail.com>
To:     Luiz Augusto von Dentz <luiz.dentz@gmail.com>
Cc:     "linux-bluetooth@vger.kernel.org" <linux-bluetooth@vger.kernel.org>
Subject: Re: bluez: Export SDP "Remote audio volume control" item for HSP
 profile
Message-ID: <20191212230314.g5gt6rxkphzpwucd@pali>
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On Thursday 12 December 2019 21:42:27 Luiz Augusto von Dentz wrote:
> Hi Pali,
>=20
> On Thu, Dec 12, 2019 at 7:31 PM Pali Roh=C3=A1r <pali.rohar@gmail.com> wr=
ote:
> >
> > 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.
>=20
> 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.

--=20
Pali Roh=C3=A1r
pali.rohar@gmail.com

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