/dbus-audio-controller

Primary LanguageC

Setup on ubuntu

sudo apt install -y cmake
sudo apt install -y libglib2.0-dev
sudo apt install -y pkg-config
sudo apt-get -y install dbus libdbus-1-dev libdbus-glib-1-2 libdbus-glib-1-dev
sudo apt-get install libboost-all-dev
sudo apt-get install -y libboost-all-dev

Get XML of interface

  • Install d-feet by running sudo apt install -y d-feet
  • Start your media application, in my case, spotify.
  • Start d-feet
  • Go to the Session bus tab search for MediaPlayer2
  • Expand Interfaces-> org.freedesktop.DBus.Introspectable -> Methods
  • Double click on Introspect(), then click Execute
  • In the ouput you should get the following: 
    ('<!DOCTYPE node PUBLIC "-//freedesktop//DTD D-BUS Object Introspection '
'1.0//EN"\n'
'                      '
'"http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd">\n'
'<!-- GDBus 2.56.4 -->\n'
'<node>\n'
'  <interface name="org.freedesktop.DBus.Properties">\n'
'    <method name="Get">\n'
'      <arg type="s" name="interface_name" direction="in"/>\n'
'      <arg type="s" name="property_name" direction="in"/>\n'
'      <arg type="v" name="value" direction="out"/>\n'
'    </method>\n'
'    <method name="GetAll">\n'
'      <arg type="s" name="interface_name" direction="in"/>\n'
'      <arg type="a{sv}" name="properties" direction="out"/>\n'
'    </method>\n'
'    <method name="Set">\n'
'      <arg type="s" name="interface_name" direction="in"/>\n'
'      <arg type="s" name="property_name" direction="in"/>\n'
'      <arg type="v" name="value" direction="in"/>\n'
'    </method>\n'
'    <signal name="PropertiesChanged">\n'
'      <arg type="s" name="interface_name"/>\n'
'      <arg type="a{sv}" name="changed_properties"/>\n'
'      <arg type="as" name="invalidated_properties"/>\n'
'    </signal>\n'
'  </interface>\n'
'  <interface name="org.freedesktop.DBus.Introspectable">\n'
'    <method name="Introspect">\n'
'      <arg type="s" name="xml_data" direction="out"/>\n'
'    </method>\n'
'  </interface>\n'
'  <interface name="org.freedesktop.DBus.Peer">\n'
'    <method name="Ping"/>\n'
'    <method name="GetMachineId">\n'
'      <arg type="s" name="machine_uuid" direction="out"/>\n'
'    </method>\n'
'  </interface>\n'
'  <interface name="org.mpris.MediaPlayer2">\n'
'    <method name="Raise"/>\n'
'    <method name="Quit"/>\n'
'    <property type="b" name="CanQuit" access="read"/>\n'
'    <property type="b" name="CanRaise" access="read"/>\n'
'    <property type="b" name="HasTrackList" access="read"/>\n'
'    <property type="s" name="Identity" access="read"/>\n'
'    <property type="s" name="DesktopEntry" access="read"/>\n'
'    <property type="as" name="SupportedUriSchemes" access="read"/>\n'
'    <property type="as" name="SupportedMimeTypes" access="read"/>\n'
'  </interface>\n'
'  <interface name="org.mpris.MediaPlayer2.Player">\n'
'    <method name="Next"/>\n'
'    <method name="Previous"/>\n'
'    <method name="Pause"/>\n'
'    <method name="PlayPause"/>\n'
'    <method name="Stop"/>\n'
'    <method name="Play"/>\n'
'    <method name="Seek">\n'
'      <arg type="x" name="Offset" direction="in"/>\n'
'    </method>\n'
'    <method name="SetPosition">\n'
'      <arg type="o" name="TrackId" direction="in"/>\n'
'      <arg type="x" name="Position" direction="in"/>\n'
'    </method>\n'
'    <method name="OpenUri">\n'
'      <arg type="s" name="Uri" direction="in"/>\n'
'    </method>\n'
'    <signal name="Seeked">\n'
'      <arg type="x" name="Position"/>\n'
'    </signal>\n'
'    <property type="s" name="PlaybackStatus" access="read"/>\n'
'    <property type="s" name="LoopStatus" access="readwrite"/>\n'
'    <property type="d" name="Rate" access="readwrite"/>\n'
'    <property type="b" name="Shuffle" access="readwrite"/>\n'
'    <property type="a{sv}" name="Metadata" access="read"/>\n'
'    <property type="d" name="Volume" access="readwrite"/>\n'
'    <property type="x" name="Position" access="read"/>\n'
'    <property type="d" name="MinimumRate" access="read"/>\n'
'    <property type="d" name="MaximumRate" access="read"/>\n'
'    <property type="b" name="CanGoNext" access="read"/>\n'
'    <property type="b" name="CanGoPrevious" access="read"/>\n'
'    <property type="b" name="CanPlay" access="read"/>\n'
'    <property type="b" name="CanPause" access="read"/>\n'
'    <property type="b" name="CanSeek" access="read"/>\n'
'    <property type="b" name="CanControl" access="read"/>\n'
'  </interface>\n'
'</node>\n')
  • After some cleanup we get: 
    <!DOCTYPE node PUBLIC "-//freedesktop//DTD D-BUS Object Introspection 1.0//EN"
                    "http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd">
<!-- GDBus 2.56.4 -->
<node>
<interface name="org.freedesktop.DBus.Properties">
    <method name="Get">
    <arg type="s" name="interface_name" direction="in"/>
    <arg type="s" name="property_name" direction="in"/>
    <arg type="v" name="value" direction="out"/>
    </method>
    <method name="GetAll">
    <arg type="s" name="interface_name" direction="in"/>
    <arg type="a{sv}" name="properties" direction="out"/>
    </method>
    <method name="Set">
    <arg type="s" name="interface_name" direction="in"/>
    <arg type="s" name="property_name" direction="in"/>
    <arg type="v" name="value" direction="in"/>
    </method>
    <signal name="PropertiesChanged">
    <arg type="s" name="interface_name"/>
    <arg type="a{sv}" name="changed_properties"/>
    <arg type="as" name="invalidated_properties"/>
    </signal>
</interface>
<interface name="org.freedesktop.DBus.Introspectable">
    <method name="Introspect">
    <arg type="s" name="xml_data" direction="out"/>
    </method>
</interface>
<interface name="org.freedesktop.DBus.Peer">
    <method name="Ping"/>
    <method name="GetMachineId">
    <arg type="s" name="machine_uuid" direction="out"/>
    </method>
</interface>
<interface name="org.mpris.MediaPlayer2">
    <method name="Raise"/>
    <method name="Quit"/>
    <property type="b" name="CanQuit" access="read"/>
    <property type="b" name="CanRaise" access="read"/>
    <property type="b" name="HasTrackList" access="read"/>
    <property type="s" name="Identity" access="read"/>
    <property type="s" name="DesktopEntry" access="read"/>
    <property type="as" name="SupportedUriSchemes" access="read"/>
    <property type="as" name="SupportedMimeTypes" access="read"/>
</interface>
<interface name="org.mpris.MediaPlayer2.Player">
    <method name="Next"/>
    <method name="Previous"/>
    <method name="Pause"/>
    <method name="PlayPause"/>
    <method name="Stop"/>
    <method name="Play"/>
    <method name="Seek">
    <arg type="x" name="Offset" direction="in"/>
    </method>
    <method name="SetPosition">
    <arg type="o" name="TrackId" direction="in"/>
    <arg type="x" name="Position" direction="in"/>
    </method>
    <method name="OpenUri">
    <arg type="s" name="Uri" direction="in"/>
    </method>
    <signal name="Seeked">
    <arg type="x" name="Position"/>
    </signal>
    <property type="s" name="PlaybackStatus" access="read"/>
    <property type="s" name="LoopStatus" access="readwrite"/>
    <property type="d" name="Rate" access="readwrite"/>
    <property type="b" name="Shuffle" access="readwrite"/>
    <property type="a{sv}" name="Metadata" access="read"/>
    <property type="d" name="Volume" access="readwrite"/>
    <property type="x" name="Position" access="read"/>
    <property type="d" name="MinimumRate" access="read"/>
    <property type="d" name="MaximumRate" access="read"/>
    <property type="b" name="CanGoNext" access="read"/>
    <property type="b" name="CanGoPrevious" access="read"/>
    <property type="b" name="CanPlay" access="read"/>
    <property type="b" name="CanPause" access="read"/>
    <property type="b" name="CanSeek" access="read"/>
    <property type="b" name="CanControl" access="read"/>
</interface>
</node>
  • generate the header and source file for this xml using the command: gdbus-codegen --generate-c-code generated_mediaplayer2 ./org_mpris_mediaplayer2.xml

References