Adding support for bluetooth headsets that only have HFP

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On Thu, 2016-08-18 at 07:51 -0700, James Bottomley wrote:
> I recently switched from a JBL Flip 2 which supports both HSP and HFP
> to an Ultimate Ears Boom 2 which is HFP only.  Needless to say this
> currently means that the Ultimate Ears fails to work with pulseaudio
> because we only support HSP via the native backend.  The first thing to
> note is that we can easily get HFP running in pulseaudio via a quick
> hack to switch support from HSP to HFP (see patch below) because if you
> don't negotiate protocols on HFP it looks pretty much like HSP for the
> audio stream.  Unfortunately, doing this would break half the headsets
> out there which only support HSP, so the hack is for demo purposes
> only.
> 
> I think the fix is to expose HFP and HSP separately as different
> pulseaudio profiles.  This would also allow negotiating useful HFP
> features, like wideband audio, which HSP doesn't support.  It would
> also mean that people currently using HSP would continue, even if they
> had HFP and that headsets which support both will show both in the PA
> configuration possibilities.  If people are OK with this approach, I
> can produce a patch set.

I was under the impression that supporting HFP would have to be much
more complex than that. If that one-line hack really is sufficient for
getting audio moving, I think it makes sense to add HFP support to the
native backend. I see you already went ahead and produced a more
complete patch :) I'll have a look shortly.

-- 
Tanu


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