[clutter-gst] ClutterGstPlayer: Add method to check if the player is using a live media.

[Lionel Landwerlin <llandwerlin src gnome org>]

commit 8d8f0a7512903923e2eb715d9598a636d51ca8b1
Author: Andre Moreira Magalhaes (andrunko) <andre magalhaes collabora co uk>
Date:   Wed Sep 12 20:33:20 2012 -0300

    ClutterGstPlayer: Add method to check if the player is using a live media.

 clutter-gst/clutter-gst-player.c |   60 ++++++++++++++++++++++++++++++++++++++
 clutter-gst/clutter-gst-player.h |    6 ++-
 2 files changed, 64 insertions(+), 2 deletions(-)
---
diff --git a/clutter-gst/clutter-gst-player.c b/clutter-gst/clutter-gst-player.c
index 34aabdb..22358d5 100644
--- a/clutter-gst/clutter-gst-player.c
+++ b/clutter-gst/clutter-gst-player.c
@@ -155,6 +155,7 @@ struct _ClutterGstPlayerPrivate
   gchar *uri;
 
   guint is_idle : 1;
+  guint is_live : 1;
   guint can_seek : 1;
   guint in_seek : 1;
   guint is_changing_uri : 1;
@@ -462,6 +463,31 @@ player_clear_download_buffering (ClutterGstPlayer *player)
   priv->virtual_stream_buffer_signalled = 0;
 }
 
+static gboolean
+is_live_pipeline (GstElement *pipeline)
+{
+  GstState state, pending;
+  GstStateChangeReturn state_change_res;
+  gboolean is_live = FALSE;
+
+  /* get pipeline current state, we need to change the pipeline state to PAUSED to
+   * see if we are dealing with a live source and we want to restore the pipeline
+   * state afterwards */
+  gst_element_get_state (pipeline, &state, &pending, 0);
+
+  /* a pipeline with live source should return NO_PREROLL in PAUSE */
+  state_change_res = gst_element_set_state (pipeline, GST_STATE_PAUSED);
+  is_live = (state_change_res == GST_STATE_CHANGE_NO_PREROLL);
+
+  /* restore pipeline previous state */
+  if (pending == GST_STATE_VOID_PENDING)
+    gst_element_set_state (pipeline, state);
+  else
+    gst_element_set_state (pipeline, pending);
+
+  return is_live;
+}
+
 static void
 set_uri (ClutterGstPlayer *player,
          const gchar      *uri)
@@ -541,6 +567,9 @@ set_uri (ClutterGstPlayer *player,
       gst_element_set_state (priv->pipeline, GST_STATE_NULL);
 
       g_object_set (priv->pipeline, "uri", uri, NULL);
+
+      priv->is_live = is_live_pipeline (priv->pipeline);
+
       set_subtitle_uri (player, NULL);
       autoload_subtitle (player, uri);
 
@@ -551,6 +580,7 @@ set_uri (ClutterGstPlayer *player,
   else
     {
       priv->is_idle = TRUE;
+      priv->is_live = FALSE;
       set_subtitle_uri (player, NULL);
       gst_element_set_state (priv->pipeline, GST_STATE_NULL);
       g_object_notify (G_OBJECT (player), "idle");
@@ -1958,6 +1988,15 @@ clutter_gst_player_get_in_seek_impl (ClutterGstPlayer *player)
   return priv->in_seek;
 }
 
+static gboolean
+clutter_gst_player_is_live_media_impl (ClutterGstPlayer *player)
+{
+  ClutterGstPlayerPrivate *priv;
+
+  priv = PLAYER_GET_PRIVATE (player);
+
+  return priv->is_live;
+}
 
 /**/
 
@@ -2042,6 +2081,7 @@ clutter_gst_player_init (ClutterGstPlayer *player)
   iface->set_subtitle_track = clutter_gst_player_set_subtitle_track_impl;
   iface->get_idle = clutter_gst_player_get_idle_impl;
   iface->get_in_seek = clutter_gst_player_get_in_seek_impl;
+  iface->is_live_media = clutter_gst_player_is_live_media_impl;
 
   priv = g_slice_new0 (ClutterGstPlayerPrivate);
   PLAYER_SET_PRIVATE (player, priv);
@@ -3236,3 +3276,23 @@ clutter_gst_player_get_duration (ClutterGstPlayer *player)
 
   return retval;
 }
+
+/**
+ * clutter_gst_player_is_live_media:
+ * @player: a #ClutterGstPlayer
+ *
+ * Whether the player is using a live media.
+ *
+ * Return value: TRUE if the player is using a live media, FALSE otherwise.
+ */
+gboolean
+clutter_gst_player_is_live_media (ClutterGstPlayer *player)
+{
+  ClutterGstPlayerIface *iface;
+
+  g_return_val_if_fail (CLUTTER_GST_IS_PLAYER (player), FALSE);
+
+  iface = CLUTTER_GST_PLAYER_GET_INTERFACE (player);
+
+  return iface->is_live_media (player);
+}
diff --git a/clutter-gst/clutter-gst-player.h b/clutter-gst/clutter-gst-player.h
index 012210f..3626520 100644
--- a/clutter-gst/clutter-gst-player.h
+++ b/clutter-gst/clutter-gst-player.h
@@ -124,7 +124,8 @@ struct _ClutterGstPlayerIface
   void   (* set_buffer_duration) (ClutterGstPlayer *player,
                                   gint64            duration);
 
-  void (* _iface_reserved20) (void);
+  gboolean (* is_live_media) (ClutterGstPlayer *player);
+
   void (* _iface_reserved21) (void);
   void (* _iface_reserved22) (void);
   void (* _iface_reserved23) (void);
@@ -223,12 +224,13 @@ gboolean                  clutter_gst_player_get_idle            (ClutterGstPlay
 gboolean                  clutter_gst_player_get_can_seek        (ClutterGstPlayer        *player);
 gboolean                  clutter_gst_player_get_in_seek         (ClutterGstPlayer        *player);
 
-
 void                      clutter_gst_player_set_progress        (ClutterGstPlayer        *player,
                                                                   gdouble                  progress);
 gdouble                   clutter_gst_player_get_progress        (ClutterGstPlayer        *player);
 gdouble                   clutter_gst_player_get_duration        (ClutterGstPlayer        *player);
 
+gboolean                  clutter_gst_player_is_live_media       (ClutterGstPlayer        *player);
+
 G_END_DECLS
 
 #endif /* __CLUTTER_GST_PLAYER_H__ */