--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gstreamer_core/gst/gsttypefind.c	Thu Dec 17 08:53:32 2009 +0200
@@ -0,0 +1,193 @@
+/* GStreamer
+ * Copyright (C) 2003 Benjamin Otte <in7y118@public.uni-hamburg.de>
+ *
+ * gsttypefind.c: typefinding subsystem
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/**
+ * SECTION:gsttypefind
+ * @short_description: Stream type detection
+ *
+ * The following functions allow you to detect the media type of an unknown
+ * stream.
+ *
+ * Last reviewed on 2005-11-09 (0.9.4)
+ */
+
+#include "gst_private.h"
+#include "gstinfo.h"
+#include "gsttypefind.h"
+#include "gstregistry.h"
+#include "gsttypefindfactory.h"
+
+GST_DEBUG_CATEGORY_EXTERN (type_find_debug);
+#define GST_CAT_DEFAULT type_find_debug
+
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+GType
+gst_type_find_get_type (void)
+{
+  static GType typefind_type = 0;
+
+  if (G_UNLIKELY (typefind_type == 0)) {
+    typefind_type = g_pointer_type_register_static ("GstTypeFind");
+  }
+  return typefind_type;
+}
+
+/**
+ * gst_type_find_register:
+ * @plugin: A #GstPlugin, or NULL for a static typefind function (note that
+ *    passing NULL only works in GStreamer 0.10.16 and later)
+ * @name: The name for registering
+ * @rank: The rank (or importance) of this typefind function
+ * @func: The #GstTypeFindFunction to use
+ * @extensions: Optional extensions that could belong to this type
+ * @possible_caps: Optionally the caps that could be returned when typefinding
+ *                 succeeds
+ * @data: Optional user data. This user data must be available until the plugin
+ *        is unloaded.
+ * @data_notify: a #GDestroyNotify that will be called on @data when the plugin
+ *        is unloaded.
+ *
+ * Registers a new typefind function to be used for typefinding. After
+ * registering this function will be available for typefinding.
+ * This function is typically called during an element's plugin initialization.
+ *
+ * Returns: TRUE on success, FALSE otherwise
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_type_find_register (GstPlugin * plugin, const gchar * name, guint rank,
+    GstTypeFindFunction func, gchar ** extensions,
+    const GstCaps * possible_caps, gpointer data, GDestroyNotify data_notify)
+{
+  GstTypeFindFactory *factory;
+
+  g_return_val_if_fail (name != NULL, FALSE);
+  g_return_val_if_fail (func != NULL, FALSE);
+
+  GST_INFO ("registering typefind function for %s", name);
+
+  factory = g_object_new (GST_TYPE_TYPE_FIND_FACTORY, NULL);
+  GST_DEBUG_OBJECT (factory, "using new typefind factory for %s", name);
+  g_assert (GST_IS_TYPE_FIND_FACTORY (factory));
+  gst_plugin_feature_set_name (GST_PLUGIN_FEATURE (factory), name);
+
+  gst_plugin_feature_set_rank (GST_PLUGIN_FEATURE (factory), rank);
+  if (factory->extensions)
+    g_strfreev (factory->extensions);
+
+  factory->extensions = g_strdupv (extensions);
+  gst_caps_replace (&factory->caps, (GstCaps *) possible_caps);
+  factory->function = func;
+  factory->user_data = data;
+  factory->user_data_notify = data_notify;
+  if (plugin && plugin->desc.name) {
+    GST_PLUGIN_FEATURE (factory)->plugin_name = plugin->desc.name;      /* interned string */
+  } else {
+    GST_PLUGIN_FEATURE (factory)->plugin_name = "NULL";
+  }
+  GST_PLUGIN_FEATURE (factory)->loaded = TRUE;
+
+  gst_registry_add_feature (gst_registry_get_default (),
+      GST_PLUGIN_FEATURE (factory));
+
+  return TRUE;
+}
+
+/*** typefind function interface **********************************************/
+
+/**
+ * gst_type_find_peek:
+ * @find: The #GstTypeFind object the function was called with
+ * @offset: The offset
+ * @size: The number of bytes to return
+ *
+ * Returns the @size bytes of the stream to identify beginning at offset. If
+ * offset is a positive number, the offset is relative to the beginning of the
+ * stream, if offset is a negative number the offset is relative to the end of
+ * the stream. The returned memory is valid until the typefinding function
+ * returns and must not be freed.
+ *
+ * Returns: the requested data, or NULL if that data is not available.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+guint8 *
+gst_type_find_peek (GstTypeFind * find, gint64 offset, guint size)
+{
+  g_return_val_if_fail (find->peek != NULL, NULL);
+
+  return find->peek (find->data, offset, size);
+}
+
+/**
+ * gst_type_find_suggest:
+ * @find: The #GstTypeFind object the function was called with
+ * @probability: The probability in percent that the suggestion is right
+ * @caps: The fixed #GstCaps to suggest
+ *
+ * If a #GstTypeFindFunction calls this function it suggests the caps with the
+ * given probability. A #GstTypeFindFunction may supply different suggestions
+ * in one call.
+ * It is up to the caller of the #GstTypeFindFunction to interpret these values.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_type_find_suggest (GstTypeFind * find, guint probability,
+    const GstCaps * caps)
+{
+  g_return_if_fail (find->suggest != NULL);
+  g_return_if_fail (probability <= 100);
+  g_return_if_fail (caps != NULL);
+  g_return_if_fail (gst_caps_is_fixed (caps));
+
+  find->suggest (find->data, probability, caps);
+}
+
+/**
+ * gst_type_find_get_length:
+ * @find: The #GstTypeFind the function was called with
+ *
+ * Get the length of the data stream.
+ *
+ * Returns: The length of the data stream, or 0 if it is not available.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+guint64
+gst_type_find_get_length (GstTypeFind * find)
+{
+  if (find->get_length == NULL)
+    return 0;
+
+  return find->get_length (find->data);
+}