Public bug reported:
Binary package hint: totem
Hello,
I have an application that needs to interact with various media players. This
application uses DBus to watch signals that media players send.
Many good media players (like Amarok and Guayadeque player) now
implement the DBus API and standard well, but Totem seems to lag behind
development. AFAIK, Totem does not use DBus to inform other applications
about its doings.
My application wants to track the media players' "TrackChange"
signal/message on the DBus.
Dbus-monitor is a nice tool to peek what messages applications send to/via
DBus.
Start dbus-monitor
$ dbus-monitor
Here is a typical output of a standards following media player.
The output shows a "TrackChange" signal on the DBus. It is sent when media
player changes to a new song/radio-channel or track.
Signal sender=:1.477 -> dest=(null destination) serial=65 path=/Player;
interface=org.freedesktop.MediaPlayer; member=TrackChange
array [
dict entry(
string "location"
variant string "file://http://38.108.111.24:8002";
)
dict entry(
string "title"
variant string "There s a kind of hush"
)
dict entry(
string "artist"
variant string "HERMANS HERMITS"
)
dict entry(
string "album"
variant string "Flower Power Oldies - We play the
groovy tunes you love from the 50s, 60s and 70s"
)
dict entry(
string "tracknumber"
variant int32 1819045746
)
dict entry(
string "genre"
variant string "50s 60s 70s oldies"
)
]
Other applications can catch and react to this message.
Important links:
http://www.mpris.org/1.0/spec.html
http://wiki.videolan.org/DBus-spec (the spec)
http://dbus.freedesktop.org
BTW: RhythmBox does use DBus but the interface and signal names are totally
different from standard.
I think its interface name is "org.gnome.Rhythmbox.Player" instead of
standard's "org.freedesktop.MediaPlayer"
and eg. it calls "TrackChange" signal for "playingUriChanged". Anyhow, you can
easily check these things with dbus-monitor.
ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: totem 2.30.2-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.32-24.43-generic-pae 2.6.32.15+drm33.5
Uname: Linux 2.6.32-24-generic-pae i686
NonfreeKernelModules: nvidia
Architecture: i386
Date: Sat Sep 18 17:48:30 2010
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
ProcEnviron:
LANG=en_US.utf8
SHELL=/bin/bash
SourcePackage: totem
** Affects: totem (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug i386 lucid
--
Totem does not implement DBus standrad for MediaPlayer.
https://bugs.launchpad.net/bugs/642172
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