[pulseaudio-discuss] [PATCH v5 0/7] New API for Bluetooth A2DP codecs

[Tanu Kaskinen]

On Mon, 2019-01-28 at 18:01 +0100, Georg Chini wrote:
> On 28.01.19 17:50, Tanu Kaskinen wrote:
> > On Fri, 2019-01-25 at 16:41 +0100, Pali Rohár wrote:
> > > On Friday 25 January 2019 17:11:00 Tanu Kaskinen wrote:
> > > > On Fri, 2019-01-25 at 11:02 +0100, Pali Rohár wrote:
> > > > > With profiles it is simple as it is already supported in desktop
> > > > > environments.
> > > > That's certainly a benefit. The problem is just that forcing the user
> > > > to make a choice between codecs isn't very nice if the user doesn't
> > > > know the practical difference between the provided options.
> > > User is not forced. Bluez and remote device choose codec for him. And if
> > > user is not happy with selection then can change it to something
> > > different which "plays better".
> > > 
> > > We already have module bluetooth policy which switch between HFP and
> > > A2DP profiles based on active VOIP application. So user already has
> > > microphone support when calling. And after hanging call policy module
> > > should switch back to previous A2DP profile (codec) without user
> > > interaction.
> > > 
> > > So I do not think it is such catastrophic that user need to choose
> > > something. User has already pre-selected some A2DP variant. And based on
> > > fact that lot of headsets remember last used codec per device, it is not
> > > such a big problem.
> > Yeah, it seems that the need to choose the card profile isn't very
> > common. But there can be situations where the user wants to just
> > activate the A2DP profile. How do you communicate to the user which
> > codec is currently active if the card profile is "off"?
> > 
> One question: There are codecs which support a voice back channel.
> Would we not need at least two profiles, one for "normal" A2DP and
> one for A2DP with back channel?

Yes, you're right, even if we don't have per-codec profiles, we'll need
a separate bidirectional A2DP profile when that's implemented (IIRC
it's not yet implemented by these patches).

-- 
Tanu

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