/usr/share/dbus-1/interfaces/org.kde.Phonon4Qt5.AudioOutput.xml is in libphonon4qt5-dev 4:4.10.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 | <!DOCTYPE node PUBLIC "-//freedesktop//DTD D-BUS Object Introspection 1.0//EN" "http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd">
<node>
<interface name="org.kde.Phonon.AudioOutput">
<property name="volume" type="d" access="readwrite"/>
<property name="muted" type="b" access="readwrite"/>
<property name="outputDeviceIndex" type="i" access="readwrite"/>
<signal name="volumeChanged">
<arg type="d" direction="out"/>
</signal>
<signal name="mutedChanged">
<arg type="b" direction="out"/>
</signal>
<signal name="outputDeviceIndexChanged">
<arg type="i" direction="out"/>
</signal>
<signal name="nameChanged">
<arg name="newName" type="s" direction="out"/>
</signal>
<signal name="newOutputAvailable">
<arg name="service" type="s" direction="out"/>
<arg name="path" type="s" direction="out"/>
</signal>
<signal name="outputDestroyed">
</signal>
<method name="category">
<arg type="s" direction="out"/>
</method>
<method name="name">
<arg type="s" direction="out"/>
</method>
</interface>
</node>
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