aboutsummaryrefslogtreecommitdiff
path: root/src/media-player-mpris.vala
blob: 8bc2884b002935d662b3d4815fd89e3c0fd0ba49 (plain)
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
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
/*
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Authors:
 *      Lars Uebernickel <lars.uebernickel@canonical.com>
 */

/**
 * MediaPlayerMpris represents an MRPIS-capable media player.
 */
public class MediaPlayerMpris: MediaPlayer {

	public MediaPlayerMpris (DesktopAppInfo appinfo) {
		this.appinfo = appinfo;
	}

	/** Desktop id of the player */
	public override string id {
		get {
			return this.appinfo.get_id ();
		}
	}

	/** Display name of the player */
	public override string name {
		get {
			return this.appinfo.get_name ();
		}
	}

	/** Application icon of the player */
	public override Icon? icon {
		get {
			return this.appinfo.get_icon ();
		}
	}

	/**
	 * True if an instance of the player is currently running.
	 *
	 * See also: attach(), detach()
	 */
	public override bool is_running {
		get {
			return this.proxy != null;
		}
	}

	/** Name of the player on the bus, if an instance is currently running */
	public override string dbus_name {
		get {
			return this._dbus_name;
		}
	}

	public override string state {
		get; private set; default = "Paused";
	}

	public override MediaPlayer.Track? current_track {
		get; set;
	}

	public override bool can_raise {
		get {
			return this.root != null ? this.root.CanRaise : true;
		}
	}

	public override bool can_do_play {
		get {
			return this.proxy.CanPlay;
		}
	}
	
	public override bool can_do_prev {
		get {
			return this.proxy.CanGoPrevious;
		}
	}

	public override bool can_do_next {
		get {
			return this.proxy.CanGoNext;
		}
	}

	/**
	 * 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 (MprisRoot root, string dbus_name) {
		return_if_fail (this._dbus_name == null && this.proxy == null);

		this.root = root;
		this.notify_property ("can-raise");

		this._dbus_name = dbus_name;
		Bus.get_proxy.begin<MprisPlayer> (BusType.SESSION, dbus_name, "/org/mpris/MediaPlayer2",
										  DBusProxyFlags.GET_INVALIDATED_PROPERTIES, null, got_proxy);
		Bus.get_proxy.begin<MprisPlaylists> (BusType.SESSION, dbus_name, "/org/mpris/MediaPlayer2",
											 DBusProxyFlags.GET_INVALIDATED_PROPERTIES, null, got_playlists_proxy);
	}

	/**
	 * Detach this object from a process running the associated media player.
	 *
	 * See also: attach()
	 */
	public void detach () {
		this.root = null;
		this.proxy = null;
		this._dbus_name = null;
		this.notify_property ("is-running");
		this.notify_property ("can-raise");
		this.state = "Paused";
		this.current_track = null;
	}

	/**
	 * Activate 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 override void activate () {
		try {
			if (this.proxy == null) {
				this.appinfo.launch (null, null);
				this.state = "Launching";
			}
			else if (this.root != null && this.root.CanRaise) {
				this.root.Raise ();
			}
		}
		catch (Error e) {
			warning ("unable to activate %s: %s", appinfo.get_name (), e.message);
		}
	}

	/**
	 * Toggles playing status.
	 */
	public override void play_pause () {
		if (this.proxy != null) {
			this.proxy.PlayPause.begin ();
		}
		else if (this.state != "Launching") {
			this.play_when_attached = true;
			this.activate ();
		}
	}

	/**
	 * Skips to the next track.
	 */
	public override void next () {
		if (this.proxy != null)
			this.proxy.Next.begin ();
	}

	/**
	 * Skips to the previous track.
	 */
	public override void previous () {
		if (this.proxy != null)
			this.proxy.Previous.begin ();
	}

	public override uint get_n_playlists () {
		return this.playlists != null ? this.playlists.length : 0;
	}

	public override string get_playlist_id (int index) {
		return_val_if_fail (index < this.playlists.length, "");
		return this.playlists[index].path;
	}

	public override string get_playlist_name (int index) {
		return_val_if_fail (index < this.playlists.length, "");
		return this.playlists[index].name;
	}

	public override void activate_playlist_by_name (string name) {
		if (this.playlists_proxy != null)
			this.playlists_proxy.ActivatePlaylist.begin (new ObjectPath (name));
	}

	DesktopAppInfo appinfo;
	MprisPlayer? proxy;
	MprisPlaylists ?playlists_proxy;
	string _dbus_name;
	bool play_when_attached = false;
	MprisRoot root;
	PlaylistDetails[] playlists = null;

	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.state = this.proxy.PlaybackStatus != null ? this.proxy.PlaybackStatus : "Unknown";
			this.update_current_track (gproxy.get_cached_property ("Metadata"));

			if (this.play_when_attached) {
				/* wait a little before calling PlayPause, some players need some time to
				   set themselves up */
				Timeout.add (1000, () => { proxy.PlayPause.begin (); return false; } );
				this.play_when_attached = false;
			}
		}
		catch (Error e) {
			this._dbus_name = null;
			warning ("unable to attach to media player: %s", e.message);
		}
	}

	void fetch_playlists () {
		/* The proxy is created even when the interface is not supported. GDBusProxy will
		   return 0 for the PlaylistCount property in that case. */
		if (this.playlists_proxy != null && this.playlists_proxy.PlaylistCount > 0) {
			this.playlists_proxy.GetPlaylists.begin (0, 100, "Alphabetical", false, (obj, res) => {
				try {
					this.playlists = playlists_proxy.GetPlaylists.end (res);
					this.playlists_changed ();
				}
				catch (Error e) {
					warning ("could not fetch playlists: %s", e.message);
					this.playlists = null;
				}
			});
		}
		else {
			this.playlists = null;
			this.playlists_changed ();
		}
	}

	void got_playlists_proxy (Object? obj, AsyncResult res) {
		try {
			this.playlists_proxy = Bus.get_proxy.end (res);

			var gproxy = this.proxy as DBusProxy;
			gproxy.g_properties_changed.connect (this.playlists_proxy_properties_changed);
		}
		catch (Error e) {
			warning ("unable to create mpris plalists proxy: %s", e.message);
			return;
		}

		Timeout.add (500, () => { this.fetch_playlists (); return false; } );
	}

	/* 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.state = this.proxy.PlaybackStatus != null ? this.proxy.PlaybackStatus : "Unknown";
		}
		if (changed_properties.lookup ("CanGoNext", "b", null) || changed_properties.lookup ("CanGoPrev", "b", null)) {
			this.playbackstatus_changed ();
		}

		var metadata = changed_properties.lookup_value ("Metadata", new VariantType ("a{sv}"));
		if (metadata != null)
			this.update_current_track (metadata);
	}

	void playlists_proxy_properties_changed (DBusProxy proxy, Variant changed_properties, string[] invalidated_properties) {
		if (changed_properties.lookup ("PlaylistCount", "u", null))
			this.fetch_playlists ();
	}

	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;
		}
	}
}