Add save property to Profile and Route params to notify the session
manager that they should be saved. Let the session manager only save
the Profile and Routes with the save flag.
Make pulse-server set the save flag on Profile and Route changes.
The result is that we can make a difference between user requested
changes and automatical changes and only remember the user preferences.
When a port changes availability, first check if we need to perform
a profile switch, if not select the new best port.
The Pro Audio profile exposes all devices and subdevices with maximum
channel count and no channel layout. It also have no hardware volume
and is more suited for Pro Audio usage.
See #731#704#57
Disable automatic port configuration in acp and move the logic
to the session manager.
Implement initial port selection and restore on profile activation.
Implement route switch when unavailable
Implement port settings save.
UCM profiles can use the same ports, but with different priorities. One
good example is a phone, having an earpiece and a speaker:
- the default profile will put a higher priority on the speaker
- the "voice call" profile will put a higher priority on the earpiece
When switching to the "voice call" profile, we want pipewire to take
into account the priority change, so that the earpiece gets the highest
priority and is selected by default.
As the ports have the same name in both profiles, we have a single
instance of each port in memory, and therefore need to trigger a port
update when the profile is changed, so that the priority set by the new
profile is used.
Moreover, the UCM code updates only the priority inside the
`pa_device_port` structure, so this commit also makes sure we reflect
this value into the `acp_port` structure when enabling a device.
The codepath `pa_alsa_ucm_add_ports` -> `probe_volumes` ->
`pa_alsa_path_probe` was never called leading to no HW volume being set
up when loading a card through UCM. PulseAudio calls this from
`card_set_profile` -> `pa_alsa_{sink,source}_new`.
data->path (current path for selected profile) is not set yet here
resulting in segfaults. We are not interested in printing that anyway
but instead care about the iterated `path` from data->paths.
This is needed for example for Clang compiler which uses different
annotations than GCC. It will make WebRTC to happily use PipeWire
since the spa library is header-only and WebRTC defaults to use
Clang with -Wimplicit-fallthrough.
When a port is plugged/unplugged, first update all the profile states
and then emit a profile change only for the current profile. This way
the device can look at all the updated profiles to select the best one.
When we have accurate enough hardware volume, set the software volume to
1.0. Also fixes the issue of going to 0 volume and then staying silent
until we raise the volume above 1.0.
It is not clear if the port index is in the card or device port array
and it doesn't work when many ports are active. So simply iterate the
device ports and find the ones with the active flag set.
