Hi

I have a gnome-shell extension that displays artist and title of the current song in the top bar.

This extension gets the information via mpris2 (a d-bus interface) that is currently fed by cantana (a mpd-client) that controls a mpd-player on a remote machine.

This works nicely for local content, but not for streams because then (for whatever reason) cantata does not seem to feed the mpris2-interface.

As the strings that cantata receives from mpd need to be a bit mangled anyway I now want to replace cantanta with a Perl-script of my own.

I have figured out how to receive the information I want to display from mpd, but at the moment I cannot figure out how to feed it into the d-bus.

So my question is this: Given an artist and a title (both are strings), how can I feed this data into the mpris2 interface so that it can be properly displayed?

What I have figured out is how to do the opposite (i.e. retrieving artist/title from mpris2) like this: 

use strict;

use Net::DBus;
use Data::Dumper;

my $bus = Net::DBus->find;

my $service = $bus->get_service("org.mpris.MediaPlayer2.cantata");
my $mpris = $service->get_object("/org/mpris/MediaPlayer2");

my $output = $mpris->Get('org.mpris.MediaPlayer2.Player', "Metadata");

print Dumper($output);

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This prints e.g.: 
$VAR1 = {
          'mpris:length' => 287000000,
          'xesam:title' => 'Giant Steps',
          'xesam:album' => 'Giant Steps',
          'mpris:artUrl' => 'file:///home/mh/.cache/cantata/covers/Joh
+n Coltrane/Giant Steps.png',
          'xesam:artist' => [
                              'John Coltrane'
                            ],
          'xesam:genre' => [
                             'Unknown'
                           ],
          'mpris:trackid' => '/com/googlecode/cantata/Track/11',
          'xesam:trackNumber' => 1
        };

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What I guess I need to do is to implement a d-bus service that implements the proper interfaces and provides a "Metadata"-property where I would then put artist and title information but at the moment I don't know how to do that.

Any help is greatly appreciated.

In reply to How to set mpris2 music data? by morgon

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