diff options
Diffstat (limited to 'plugins/media-keys/mpris-controller.c')
| -rw-r--r-- | plugins/media-keys/mpris-controller.c | 326 |
1 files changed, 326 insertions, 0 deletions
diff --git a/plugins/media-keys/mpris-controller.c b/plugins/media-keys/mpris-controller.c new file mode 100644 index 0000000..c70f0bc --- /dev/null +++ b/plugins/media-keys/mpris-controller.c @@ -0,0 +1,326 @@ +/* + * Copyright © 2013 Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU Lesser General Public License, + * version 2.1, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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 Lesser General Public License + * along with this program; if not, see <http://www.gnu.org/licenses> + * + * Author: Michael Wood <michael.g.wood@intel.com> + */ + +#include "mpris-controller.h" +#include "bus-watch-namespace.h" +#include <gio/gio.h> + +enum { + PROP_0, + PROP_HAS_ACTIVE_PLAYER +}; + +struct _MprisController +{ + GObject parent; + + GCancellable *cancellable; + GDBusProxy *mpris_client_proxy; + guint namespace_watcher_id; + GSList *other_proxies; +}; + +G_DEFINE_TYPE (MprisController, mpris_controller, G_TYPE_OBJECT) + +static void +mpris_controller_dispose (GObject *object) +{ + MprisController *self = MPRIS_CONTROLLER (object); + + g_clear_object (&self->cancellable); + g_clear_object (&self->mpris_client_proxy); + + if (self->namespace_watcher_id) + { + bus_unwatch_namespace (self->namespace_watcher_id); + self->namespace_watcher_id = 0; + } + + g_slist_free_full (g_steal_pointer (&self->other_proxies), g_object_unref); + + G_OBJECT_CLASS (mpris_controller_parent_class)->dispose (object); +} + +static void +mpris_proxy_call_done (GObject *object, + GAsyncResult *res, + gpointer user_data) +{ + GError *error = NULL; + GVariant *ret; + + if (!(ret = g_dbus_proxy_call_finish (G_DBUS_PROXY (object), res, &error))) + { + if (!g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED)) + g_warning ("Error calling method %s", error->message); + g_clear_error (&error); + return; + } + g_variant_unref (ret); +} + +gboolean +mpris_controller_key (MprisController *self, const gchar *key) +{ + if (!self->mpris_client_proxy) + return FALSE; + + if (g_strcmp0 (key, "Play") == 0) + key = "PlayPause"; + + g_debug ("calling %s over dbus to mpris client %s", + key, g_dbus_proxy_get_name (self->mpris_client_proxy)); + g_dbus_proxy_call (self->mpris_client_proxy, + key, NULL, 0, -1, self->cancellable, + mpris_proxy_call_done, + NULL); + return TRUE; +} + +static gboolean +mpris_client_is_playing (GDBusProxy *proxy) +{ + g_autoptr(GVariant) playback_status; + const gchar *status_str; + + playback_status = g_dbus_proxy_get_cached_property (proxy, "PlaybackStatus"); + if (!playback_status) + return FALSE; + + if (!g_variant_is_of_type (playback_status, G_VARIANT_TYPE_STRING)) + return FALSE; + + status_str = g_variant_get_string (playback_status, NULL); + return g_strcmp0 (status_str, "Playing") == 0; +} + +static void +mpris_client_notify_name_owner_cb (GDBusProxy *proxy, + GParamSpec *pspec, + MprisController *self) +{ + g_autofree gchar *name_owner = NULL; + GSList *first; + + /* Owner changed, but the proxy is still valid. */ + name_owner = g_dbus_proxy_get_name_owner (proxy); + if (name_owner) + return; + + if (proxy == self->mpris_client_proxy) + { + g_debug ("Clearing the current MPRIS client proxy"); + g_clear_object (&self->mpris_client_proxy); + + if ((first = self->other_proxies)) + { + self->mpris_client_proxy = first->data; + self->other_proxies = first->next; + g_slist_free_1 (first); + + g_debug ("Falling back to MPRIS client %s", + g_dbus_proxy_get_name (self->mpris_client_proxy)); + } + else + { + g_object_notify (G_OBJECT (self), "has-active-player"); + } + } + else + { + g_debug ("Forgetting MPRIS client %s", g_dbus_proxy_get_name (proxy)); + self->other_proxies = g_slist_remove (self->other_proxies, proxy); + g_object_unref (proxy); + } +} + +static void +mpris_client_properties_changed_cb (GDBusProxy *proxy, + GVariant *changed_properties, + GStrv invalidated_properties, + gpointer user_data) +{ + MprisController *self = MPRIS_CONTROLLER (user_data); + GDBusProxy *current_proxy; + + current_proxy = self->mpris_client_proxy; + if (current_proxy == proxy) + return; + + if (current_proxy && mpris_client_is_playing (current_proxy)) + return; + + if (mpris_client_is_playing (proxy)) + { + g_debug ("Switching to MPRIS client %s because it is playing", + g_dbus_proxy_get_name (proxy)); + + self->other_proxies = g_slist_remove (self->other_proxies, proxy); + + if (current_proxy) + self->other_proxies = g_slist_prepend (self->other_proxies, current_proxy); + + self->mpris_client_proxy = proxy; + + if (!current_proxy) + g_object_notify (user_data, "has-active-player"); + } +} + +static void +mpris_proxy_ready_cb (GObject *object, + GAsyncResult *res, + gpointer user_data) +{ + MprisController *self = MPRIS_CONTROLLER (user_data); + GError *error = NULL; + GDBusProxy *proxy; + const gchar *name; + + proxy = g_dbus_proxy_new_for_bus_finish (res, &error); + + if (!proxy) + { + if (!g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED)) + g_warning ("Error connecting to MPRIS interface: %s", error->message); + g_clear_error (&error); + return; + } + + g_signal_connect (proxy, "notify::g-name-owner", + G_CALLBACK (mpris_client_notify_name_owner_cb), user_data); + + g_signal_connect (proxy, "g-properties-changed", + G_CALLBACK (mpris_client_properties_changed_cb), user_data); + + name = g_dbus_proxy_get_name (proxy); + + if (self->mpris_client_proxy) + { + if (mpris_client_is_playing (self->mpris_client_proxy)) + { + g_debug ("Remembering %s for later because the current MPRIS client is playing", + name); + self->other_proxies = g_slist_prepend (self->other_proxies, proxy); + return; + } + + g_debug ("Remembering the current MPRIS client for later"); + self->other_proxies = + g_slist_prepend (self->other_proxies, self->mpris_client_proxy); + } + + g_debug ("Switching to MPRIS client %s because it just appeared", name); + + self->mpris_client_proxy = proxy; + + g_object_notify (user_data, "has-active-player"); +} + +static void +start_mpris_proxy (MprisController *self, const gchar *name) +{ + g_debug ("Creating proxy for %s", name); + g_dbus_proxy_new_for_bus (G_BUS_TYPE_SESSION, + 0, + NULL, + name, + "/org/mpris/MediaPlayer2", + "org.mpris.MediaPlayer2.Player", + self->cancellable, + mpris_proxy_ready_cb, + self); +} + +static void +mpris_player_appeared (GDBusConnection *connection, + const gchar *name, + const gchar *name_owner, + gpointer user_data) +{ + start_mpris_proxy (MPRIS_CONTROLLER (user_data), name); +} + +static void +mpris_controller_constructed (GObject *object) +{ + MprisController *self = MPRIS_CONTROLLER (object); + + self->namespace_watcher_id = bus_watch_namespace (G_BUS_TYPE_SESSION, + "org.mpris.MediaPlayer2", + mpris_player_appeared, + NULL, + MPRIS_CONTROLLER (object), + NULL); +} + +static void +mpris_controller_get_property (GObject *object, + guint prop_id, + GValue *value, + GParamSpec *pspec) +{ + MprisController *self = MPRIS_CONTROLLER (object); + + switch (prop_id) { + case PROP_HAS_ACTIVE_PLAYER: + g_value_set_boolean (value, + mpris_controller_get_has_active_player (self)); + break; + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); + break; + } +} + +static void +mpris_controller_class_init (MprisControllerClass *klass) +{ + GObjectClass *object_class = G_OBJECT_CLASS (klass); + + object_class->constructed = mpris_controller_constructed; + object_class->dispose = mpris_controller_dispose; + object_class->get_property = mpris_controller_get_property; + + g_object_class_install_property (object_class, + PROP_HAS_ACTIVE_PLAYER, + g_param_spec_boolean ("has-active-player", + NULL, + NULL, + FALSE, + G_PARAM_READABLE)); +} + +static void +mpris_controller_init (MprisController *self) +{ +} + +gboolean +mpris_controller_get_has_active_player (MprisController *controller) +{ + g_return_val_if_fail (MPRIS_IS_CONTROLLER (controller), FALSE); + + return (controller->mpris_client_proxy != NULL); +} + +MprisController * +mpris_controller_new (void) +{ + return g_object_new (MPRIS_TYPE_CONTROLLER, NULL); +} |