https://bugs.freedesktop.org/show_bug.cgi?id=45858
Bug #: 45858
Summary: module-zeroconf-discover gets highly confused when two
network interfaces are in the same network segment
Classification: Unclassified
Product: PulseAudio
Version: unspecified
Platform: x86-64 (AMD64)
OS/Version: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: modules
AssignedTo: [email protected]
ReportedBy: [email protected]
QAContact: [email protected]
CC: [email protected]
When two network interfaces are in the same network segment, and a remote
server is available, avahi reports this:
[email protected] α:
avahi-browse -a | grep pulse
+ wlan0 IPv4 [email protected] PulseAudio Sound
Server local
+ wlan0 IPv4 [email protected]: Internal Audio PulseAudio Sound
Sink local
+ p5p1 IPv4 [email protected]: Internal Audio PulseAudio Sound
Sink local
+ p5p1 IPv4 [email protected] PulseAudio Sound
Server local
And the sink appears in the local server as a remote sink.
When one network interface is disconnected, this happens in avahi:
- p5p1 IPv4 [email protected] PulseAudio Sound
Server local
- p5p1 IPv4 [email protected]: Internal Audio PulseAudio Sound
Sink local
The sink DISAPPEARS from pulseaudio volume control. However both sink and
server CONTINUE to be available in wlan0:
+ wlan0 IPv4 [email protected] PulseAudio Sound
Server local
+ wlan0 IPv4 [email protected]: Internal Audio PulseAudio Sound
Sink local
Note that, at this point, connecting p5p1 again makes the sink reappear in
pulseaudio volume control.
This points to a bug in module-zeroconf-discover, where it does the simpleton
thing of adding a sink by name when it sees the sink appear, and removes it
when it sees the sink disappear.
What it should do instead, is keep a reference count to the sink, and increment
the count when it appears on a network interface in avahi, decrement the count
when it disappears on a network interface, and only display it as an available
sink when the reference count is >0. Alternatively, PA zeroconf-discover could
consult avahi to see if a sink with the same name continues to be available in
another network interface.
Thanks in advance for the fix! :-)
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