[pulseaudio-discuss] Software for switching/managing ports and profiles

[Tanu Kaskinen]

On Mon, 2019-12-09 at 11:17 +0000, Bob Ham wrote:
> Hi there,
> 
> I'm working on the Librem 5 phone and we need to be able to manage
> PulseAudio ports and profiles, mapped from UCM devices and verbs.  So
> for example we need to switch from a Handset port to a SpeakerPhone port
> when the "Speakerphone" button in the dialer is toggled.  Ideally we
> also need to do more complex things like prohibit notification sounds
> playing when a phone call is active.
> 
> Does anyone know of any existing software for managing PulseAudio ports
> and profiles?

People certainly have written such software, but I'm not aware of
anything that would be easy to adopt. People have generally opted for
creating a policy module that interfaces with some external policy
daemon. In practice they have forked PulseAudio, becaues there's no
stable module API, so the modules need to be built together with
PulseAudio (or at least PulseAudio needs to be patched to install the
internal headers). Nokia used a policy module + policy daemon with the
Maemo and Meego phones, and Sailfish OS inherited that (I don't know if
they're still using the same system). Intel created the Murphy policy
daemon for automotive IVI systems and that too had an associated
PulseAudio module. I think I've seen a custom policy module also in
Ubuntu (I don't know if it's used outside their phone distro).

-- 
Tanu

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