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/*
* Copyright 2013 Canonical Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 3.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Authors:
* Lars Uebernickel <lars.uebernickel@canonical.com>
*/
/**
* MediaPlayer represents an MRPIS-capable media player.
*/
public class MediaPlayer: Object {
public MediaPlayer (DesktopAppInfo appinfo) {
this.appinfo = appinfo;
}
/** Desktop id of the player */
public string id {
get {
return this.appinfo.get_id ();
}
}
/** Display name of the player */
public string name {
get {
return this.appinfo.get_name ();
}
}
/** Application icon of the player */
public Icon icon {
get {
return this.appinfo.get_icon ();
}
}
/**
* True if an instance of the player is currently running.
*
* See also: attach(), detach()
*/
public bool is_running {
get {
return this.proxy != null;
}
}
/** Name of the player on the bus, if an instance is currently running */
public string dbus_name {
get {
return this._dbus_name;
}
}
public string state {
get {
if (this.proxy != null && this.proxy.PlaybackStatus == "Playing")
return "Playing";
else
return "Paused";
}
}
public class Track : Object {
public string artist { get; construct; }
public string title { get; construct; }
public string album { get; construct; }
public string art_url { get; construct; }
public Track (string artist, string title, string album, string art_url) {
Object (artist: artist, title: title, album: album, art_url: art_url);
}
}
public Track current_track {
get; set;
}
/**
* Attach this object to a process of the associated media player. The player must own @dbus_name and
* implement the org.mpris.MediaPlayer2.Player interface.
*
* Only one player can be attached at any given time. Use detach() to detach a player.
*
* This method does not block. If it is successful, "is-running" will be set to %TRUE.
*/
public void attach (string dbus_name) {
return_if_fail (this._dbus_name == null && this.proxy == null);
this._dbus_name = dbus_name;
Bus.get_proxy.begin<MprisPlayer> (BusType.SESSION, dbus_name, "/org/mpris/MediaPlayer2",
DBusProxyFlags.GET_INVALIDATED_PROPERTIES, null, got_proxy);
}
/**
* Detach this object from a process running the associated media player.
*
* See also: attach()
*/
public void detach () {
this.proxy = null;
this._dbus_name = null;
this.notify_property ("is-running");
}
/**
* Launch the associated media player.
*
* Note: this will _not_ call attach(), because it doesn't know on which dbus-name the player will appear.
* Use attach() to attach this object to a running instance of the player.
*/
public void launch () {
try {
this.appinfo.launch (null, null);
}
catch (Error e) {
warning ("unable to launch %s: %s", appinfo.get_name (), e.message);
}
}
DesktopAppInfo appinfo;
MprisPlayer? proxy;
string _dbus_name;
void got_proxy (Object? obj, AsyncResult res) {
try {
this.proxy = Bus.get_proxy.end (res);
/* Connecting to GDBusProxy's "g-properties-changed" signal here, because vala's dbus objects don't
* emit notify signals */
var gproxy = this.proxy as DBusProxy;
gproxy.g_properties_changed.connect (this.proxy_properties_changed);
this.notify_property ("is-running");
this.notify_property ("state");
this.update_current_track (gproxy.get_cached_property ("Metadata"));
}
catch (Error e) {
this._dbus_name = null;
warning ("unable to attach to media player: %s", e.message);
}
}
/* some players (e.g. Spotify) don't follow the spec closely and pass single strings in metadata fields
* where an array of string is expected */
static string sanitize_metadata_value (Variant? v) {
if (v == null)
return "";
else if (v.is_of_type (VariantType.STRING))
return v.get_string ();
else if (v.is_of_type (VariantType.STRING_ARRAY))
return string.joinv (",", v.get_strv ());
warn_if_reached ();
return "";
}
void proxy_properties_changed (DBusProxy proxy, Variant changed_properties, string[] invalidated_properties) {
if (changed_properties.lookup ("PlaybackStatus", "s", null))
this.notify_property ("state");
var metadata = changed_properties.lookup_value ("Metadata", new VariantType ("a{sv}"));
if (metadata != null)
this.update_current_track (metadata);
}
void update_current_track (Variant metadata) {
if (metadata != null) {
this.current_track = new Track (
sanitize_metadata_value (metadata.lookup_value ("xesam:artist", null)),
sanitize_metadata_value (metadata.lookup_value ("xesam:title", null)),
sanitize_metadata_value (metadata.lookup_value ("xesam:album", null)),
sanitize_metadata_value (metadata.lookup_value ("mpris:artUrl", null))
);
}
else {
this.current_track = null;
}
}
}
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