[pulseaudio-tickets] [Bug 95202] New: module-device-manager reroutes streams too eagerly

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95202

            Bug ID: 95202
           Summary: module-device-manager reroutes streams too eagerly
           Product: PulseAudio
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: modules
          Assignee: pulseaudio-bugs at lists.freedesktop.org
          Reporter: tanuk at iki.fi
        QA Contact: pulseaudio-bugs at lists.freedesktop.org
                CC: lennart at poettering.net

Whenever something changes on a stream, module-device-manager (with
do_routing=true) will re-evaluate the stream's routing to react to stream role
changes. module-device-manager will not reroute streams that have
pa_sink_input.save_sink set, which avoids rerouting of manually routed streams
most of the time.

When an application creates a new playback stream, it may set the sink for the
new stream. That counts as manual routing, so device-manager should not reroute
the stream as long as the requested sink stays available, but such streams
don't have save_sink set, so rerouting does happen.

An example:

    paplay --device=foo somefile.ogg

That will play the audio to sink "foo", which in this example is not what
device-manager would prefer to use. Now let's change the volume:

    pactl set-sink-input-volume 42 +5%

That volume change will trigger rerouting in device-manager, so the stream gets
moved to a different sink!

We should make it possible to distinguish between all three cases:

* manually routed streams with persistent device configuration (can be done
currently by checking save_sink == true)

* manually routed streams with ephemeral device configuration (can't be done
currently, except during stream creation)

* automatically routed streams (can be done currently by checking save_sink ==
false)

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