playbin2: Have playbin recognise PGS subpicture streams

Recognise PGS subpicture streams and connect them to the SPU pad
in playsink. Unfortunately this fails badly with negotiation errors
if the SPU is not recent enough to support the stream. I'm not sure
how to add format negotiation in yet.

gst/playback/gstplaybin2.c

@@ -115,7 +115,7 @@
  * GNOME-based applications, for example, will usually want to create
  * gconfaudiosink and gconfvideosink elements and make playbin use those,
  * so that output happens to whatever the user has configured in the GNOME
- * Multimedia System Selector confinguration dialog.
+ * Multimedia System Selector configuration dialog.
  *
  * The sink elements do not necessarily need to be ready-made sinks. It is
  * possible to create container elements that look like a sink to playbin,
@@ -251,7 +251,7 @@ typedef struct _GstSourceSelect GstSourceSelect;
 /* has the info for a selector and provides the link to the sink */
 struct _GstSourceSelect
 {
-  const gchar *media;           /* the media type of the selector */
+  const gchar *media_list[3];   /* the media types for the selector */
   GstPlaySinkType type;         /* the sink pad type of the selector */
 
   GstElement *selector;         /* the selector */
@@ -968,22 +968,26 @@ init_group (GstPlayBin * playbin, GstSourceGroup * group)
   /* init selectors. The selector is found by finding the first prefix that
    * matches the media. */
   group->playbin = playbin;
-  group->selector[0].media = "audio/x-raw-";
+  /* If you add any items to these lists, check that media_list[] is defined
+   * above to be large enough to hold MAX(items)+1, so as to accomodate a
+   * NULL terminator (set when the memory is zeroed on allocation) */
+  group->selector[0].media_list[0] = "audio/x-raw-";
   group->selector[0].type = GST_PLAY_SINK_TYPE_AUDIO_RAW;
   group->selector[0].channels = group->audio_channels;
-  group->selector[1].media = "audio/";
+  group->selector[1].media_list[0] = "audio/";
   group->selector[1].type = GST_PLAY_SINK_TYPE_AUDIO;
   group->selector[1].channels = group->audio_channels;
-  group->selector[2].media = "video/x-raw-";
+  group->selector[2].media_list[0] = "video/x-raw-";
   group->selector[2].type = GST_PLAY_SINK_TYPE_VIDEO_RAW;
   group->selector[2].channels = group->video_channels;
-  group->selector[3].media = "video/x-dvd-subpicture";
+  group->selector[3].media_list[0] = "video/x-dvd-subpicture";
+  group->selector[3].media_list[1] = "subpicture/x-pgs";
   group->selector[3].type = GST_PLAY_SINK_TYPE_SUBPIC;
   group->selector[3].channels = group->subp_channels;
-  group->selector[4].media = "video/";
+  group->selector[4].media_list[0] = "video/";
   group->selector[4].type = GST_PLAY_SINK_TYPE_VIDEO;
   group->selector[4].channels = group->video_channels;
-  group->selector[5].media = "text/";
+  group->selector[5].media_list[0] = "text/";
   group->selector[5].type = GST_PLAY_SINK_TYPE_TEXT;
   group->selector[5].channels = group->text_channels;
 }
@@ -1703,7 +1707,7 @@ gst_play_bin_get_property (GObject * object, guint prop_id, GValue * value,
 /* mime types we are not handling on purpose right now, don't post a
  * missing-plugin message for these */
 static const gchar *blacklisted_mimes[] = {
-  "video/x-dvd-subpicture", NULL
+  "video/x-dvd-subpicture", "subpicture/x-pgs", NULL
 };
 
 static void
@@ -1785,6 +1789,19 @@ selector_blocked (GstPad * pad, gboolean blocked, gpointer user_data)
   GST_DEBUG_OBJECT (pad, "blocked callback, blocked: %d", blocked);
 }
 
+/* helper function to lookup stuff in lists */
+static gboolean
+array_has_value (const gchar * values[], const gchar * value)
+{
+  gint i;
+
+  for (i = 0; values[i]; i++) {
+    if (g_str_has_prefix (value, values[i]))
+      return TRUE;
+  }
+  return FALSE;
+}
+
 /* this function is called when a new pad is added to decodebin. We check the
  * type of the pad and add it to the selector element of the group. 
  */
@@ -1813,7 +1830,7 @@ pad_added_cb (GstElement * decodebin, GstPad * pad, GstSourceGroup * group)
 
   /* major type of the pad, this determines the selector to use */
   for (i = 0; i < GST_PLAY_SINK_TYPE_LAST; i++) {
-    if (g_str_has_prefix (name, group->selector[i].media)) {
+    if (array_has_value (group->selector[i].media_list, name)) {
       select = &group->selector[i];
       break;
     }
@@ -2040,8 +2057,8 @@ no_more_pads_cb (GstElement * decodebin, GstSourceGroup * group)
       select->sinkpad =
           gst_play_sink_request_pad (playbin->playsink, select->type);
       res = gst_pad_link (select->srcpad, select->sinkpad);
-      GST_DEBUG_OBJECT (playbin, "linked type %s, result: %d", select->media,
+      GST_DEBUG_OBJECT (playbin, "linked type %s, result: %d",
-          res);
+          select->media_list[0], res);
       if (res != GST_PAD_LINK_OK) {
         GST_ELEMENT_ERROR (playbin, CORE, PAD,
             ("Internal playbin error."),
@@ -2509,7 +2526,7 @@ deactivate_group (GstPlayBin * playbin, GstSourceGroup * group)
   for (i = 0; i < GST_PLAY_SINK_TYPE_LAST; i++) {
     GstSourceSelect *select = &group->selector[i];
 
-    GST_DEBUG_OBJECT (playbin, "unlinking selector %s", select->media);
+    GST_DEBUG_OBJECT (playbin, "unlinking selector %s", select->media_list[0]);
 
     if (select->srcpad) {
       if (select->sinkpad) {