discoverer: query seekability

Besides the duration we can also query the seekability of a stream. Use the new
API in the gst-discoverer tool.

API: gst_discoverer_info_get_seekable

gst-libs/gst/pbutils/gstdiscoverer-types.c

@@ -897,6 +897,17 @@ gst_discoverer_info_get_stream_list (GstDiscovererInfo * info)
 
 DISCOVERER_INFO_ACCESSOR_CODE (duration, GstClockTime, GST_CLOCK_TIME_NONE);
 
+/**
+ * gst_discoverer_info_get_seekable:
+ * @info: a #GstDiscovererInfo
+ *
+ * Returns: the wheter the URI is seekable.
+ *
+ * Since: 0.10.32
+ */
+
+DISCOVERER_INFO_ACCESSOR_CODE (seekable, gboolean, FALSE);
+
 /**
  * gst_discoverer_info_get_misc:
  * @info: a #GstDiscovererInfo

gst-libs/gst/pbutils/gstdiscoverer.c

@@ -105,6 +105,9 @@ struct _GstDiscovererPrivate
   GMainContext *ctx;
   guint sourceid;
   guint timeoutid;
+
+  /* reusable queries */
+  GstQuery *seeking_query;
 };
 
 #define DISCO_LOCK(dc) g_mutex_lock (dc->priv->lock);
@@ -242,6 +245,7 @@ static void
 gst_discoverer_init (GstDiscoverer * dc)
 {
   GstElement *tmp;
+  GstFormat format = GST_FORMAT_TIME;
 
   dc->priv = G_TYPE_INSTANCE_GET_PRIVATE (dc, GST_TYPE_DISCOVERER,
       GstDiscovererPrivate);
@@ -284,6 +288,9 @@ gst_discoverer_init (GstDiscoverer * dc)
   tmp = gst_element_factory_make ("decodebin2", NULL);
   dc->priv->decodebin2_type = G_OBJECT_TYPE (tmp);
   gst_object_unref (tmp);
+
+  /* create queries */
+  dc->priv->seeking_query = gst_query_new_seeking (format);
 }
 
 static void
@@ -322,6 +329,11 @@ gst_discoverer_dispose (GObject * obj)
     g_mutex_free (dc->priv->lock);
     dc->priv->lock = NULL;
   }
+
+  if (dc->priv->seeking_query) {
+    gst_query_unref (dc->priv->seeking_query);
+    dc->priv->seeking_query = NULL;
+  }
 }
 
 static void
@@ -859,18 +871,31 @@ discoverer_collect (GstDiscoverer * dc)
   if (dc->priv->streams) {
     /* FIXME : Make this querying optional */
     if (TRUE) {
+      GstElement *pipeline = (GstElement *) dc->priv->pipeline;
       GstFormat format = GST_FORMAT_TIME;
       gint64 dur;
 
       GST_DEBUG ("Attempting to query duration");
 
-      if (gst_element_query_duration ((GstElement *) dc->priv->pipeline,
-              &format, &dur)) {
+      if (gst_element_query_duration (pipeline, &format, &dur)) {
         if (format == GST_FORMAT_TIME) {
           GST_DEBUG ("Got duration %" GST_TIME_FORMAT, GST_TIME_ARGS (dur));
           dc->priv->current_info->duration = (guint64) dur;
         }
       }
+
+      if (dc->priv->seeking_query) {
+        if (gst_element_query (pipeline, dc->priv->seeking_query)) {
+          gboolean seekable;
+
+          gst_query_parse_seeking (dc->priv->seeking_query, &format,
+              &seekable, NULL, NULL);
+          if (format == GST_FORMAT_TIME) {
+            GST_DEBUG ("Got seekable %d", seekable);
+            dc->priv->current_info->seekable = seekable;
+          }
+        }
+      }
     }
 
     if (dc->priv->current_topology)
@@ -894,8 +919,8 @@ discoverer_collect (GstDiscoverer * dc)
           gst_caps_get_structure (dc->priv->current_info->stream_info->caps, 0);
 
       if (g_str_has_prefix (gst_structure_get_name (st), "image/"))
-        ((GstDiscovererVideoInfo *) dc->priv->current_info->
-            stream_info)->is_image = TRUE;
+        ((GstDiscovererVideoInfo *) dc->priv->current_info->stream_info)->
+            is_image = TRUE;
     }
   }
 

gst-libs/gst/pbutils/gstdiscoverer.h

@@ -179,6 +179,7 @@ GstDiscovererResult       gst_discoverer_info_get_result(const GstDiscovererInfo
 GstDiscovererStreamInfo*  gst_discoverer_info_get_stream_info(GstDiscovererInfo* info);
 GList*                    gst_discoverer_info_get_stream_list(GstDiscovererInfo* info);
 GstClockTime              gst_discoverer_info_get_duration(const GstDiscovererInfo* info);
+gboolean                  gst_discoverer_info_get_seekable(const GstDiscovererInfo* info);
 const GstStructure*       gst_discoverer_info_get_misc(const GstDiscovererInfo* info);
 const GstTagList*         gst_discoverer_info_get_tags(const GstDiscovererInfo* info);
 

gst-libs/gst/pbutils/pbutils-private.h

@@ -78,6 +78,7 @@ struct _GstDiscovererInfo {
   GstClockTime duration;
   GstStructure *misc;
   GstTagList *tags;
+  gboolean seekable;
 };
 
 /* missing-plugins.c */

tools/gst-discoverer.c

@@ -241,10 +241,12 @@ print_topology (GstDiscovererStreamInfo * info, gint depth)
 }
 
 static void
-print_duration (GstDiscovererInfo * info, gint tab)
+print_properties (GstDiscovererInfo * info, gint tab)
 {
-  g_print ("%*s%" GST_TIME_FORMAT "\n", tab + 1, " ",
+  g_print ("%*sDuration: %" GST_TIME_FORMAT "\n", tab + 1, " ",
       GST_TIME_ARGS (gst_discoverer_info_get_duration (info)));
+  g_print ("%*sSeekable: %s\n", tab + 1, " ",
+      (gst_discoverer_info_get_seekable (info) ? "yes" : "no"));
 }
 
 static void
@@ -296,8 +298,8 @@ print_info (GstDiscovererInfo * info, GError * err)
   if ((sinfo = gst_discoverer_info_get_stream_info (info))) {
     g_print ("\nTopology:\n");
     print_topology (sinfo, 1);
-    g_print ("\nDuration:\n");
-    print_duration (info, 1);
+    g_print ("\nProperties:\n");
+    print_properties (info, 1);
     gst_discoverer_stream_info_unref (sinfo);
   }
 

win32/common/libgstpbutils.def

@@ -26,6 +26,7 @@ EXPORTS
 	gst_discoverer_info_get_duration
 	gst_discoverer_info_get_misc
 	gst_discoverer_info_get_result
+	gst_discoverer_info_get_seekable
 	gst_discoverer_info_get_stream_info
 	gst_discoverer_info_get_stream_list
 	gst_discoverer_info_get_streams