diff -r 000000000000 -r 0e761a78d257 gstreamer_core/gst/gstquery.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gstreamer_core/gst/gstquery.c	Thu Dec 17 08:53:32 2009 +0200
@@ -0,0 +1,1237 @@
+/* GStreamer
+ * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
+ *                    2000 Wim Taymans <wim.taymans@chello.be>
+ *                    2005 Wim Taymans <wim@fluendo.com>
+ *
+ * gstquery.c: GstQueryType registration and Query parsing/creation
+ *
+ * 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:gstquery
+ * @short_description: Dynamically register new query types. Provide functions
+ *                     to create queries, and to set and parse values in them.
+ * @see_also: #GstPad, #GstElement
+ *
+ * GstQuery functions are used to register a new query types to the gstreamer
+ * core.
+ * Query types can be used to perform queries on pads and elements.
+ *
+ * Queries can be created using the gst_query_new_xxx() functions.  
+ * Query values can be set using gst_query_set_xxx(), and parsed using 
+ * gst_query_parse_xxx() helpers.
+ *
+ * The following example shows how to query the duration of a pipeline:
+ * 
+ * <example>
+ *  <title>Query duration on a pipeline</title>
+ *  <programlisting>
+ *  GstQuery *query;
+ *  gboolean res;
+ *  query = gst_query_new_duration (GST_FORMAT_TIME);
+ *  res = gst_element_query (pipeline, query);
+ *  if (res) {
+ *    gint64 duration;
+ *    gst_query_parse_duration (query, NULL, &amp;duration);
+ *    g_print ("duration = %"GST_TIME_FORMAT, GST_TIME_ARGS (duration));
+ *  }
+ *  else {
+ *    g_print ("duration query failed...");
+ *  }
+ *  gst_query_unref (query);
+ *  </programlisting>
+ * </example>
+ *
+ * Last reviewed on 2006-02-14 (0.10.4)
+ */
+
+#include "gst_private.h"
+#include "gstinfo.h"
+#include "gstquery.h"
+#include "gstvalue.h"
+#include "gstenumtypes.h"
+#include "gstquark.h"
+
+#ifdef __SYMBIAN32__
+#include <glib_global.h>
+#endif
+
+GST_DEBUG_CATEGORY_STATIC (gst_query_debug);
+#define GST_CAT_DEFAULT gst_query_debug
+
+static void gst_query_class_init (gpointer g_class, gpointer class_data);
+static void gst_query_finalize (GstQuery * query);
+static GstQuery *_gst_query_copy (GstQuery * query);
+
+static GStaticMutex mutex = G_STATIC_MUTEX_INIT;
+static GList *_gst_queries = NULL;
+static GHashTable *_nick_to_query = NULL;
+static GHashTable *_query_type_to_nick = NULL;
+static guint32 _n_values = 1;   /* we start from 1 because 0 reserved for NONE */
+
+static GstMiniObjectClass *parent_class = NULL;
+
+static GstQueryTypeDefinition standard_definitions[] = {
+  {GST_QUERY_POSITION, "position", "Current position", 0},
+  {GST_QUERY_DURATION, "duration", "Total duration", 0},
+  {GST_QUERY_LATENCY, "latency", "Latency", 0},
+  {GST_QUERY_JITTER, "jitter", "Jitter", 0},
+  {GST_QUERY_RATE, "rate", "Configured rate 1000000 = 1", 0},
+  {GST_QUERY_SEEKING, "seeking", "Seeking capabilities and parameters", 0},
+  {GST_QUERY_SEGMENT, "segment", "currently configured segment", 0},
+  {GST_QUERY_CONVERT, "convert", "Converting between formats", 0},
+  {GST_QUERY_FORMATS, "formats", "Supported formats for conversion", 0},
+  {0, NULL, NULL, 0}
+};
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+
+void
+_gst_query_initialize (void)
+{
+  GstQueryTypeDefinition *standards = standard_definitions;
+
+  GST_CAT_INFO (GST_CAT_GST_INIT, "init queries");
+
+  GST_DEBUG_CATEGORY_INIT (gst_query_debug, "query", 0, "query system");
+
+  g_static_mutex_lock (&mutex);
+  if (_nick_to_query == NULL) {
+    _nick_to_query = g_hash_table_new (g_str_hash, g_str_equal);
+    _query_type_to_nick = g_hash_table_new (NULL, NULL);
+  }
+
+  while (standards->nick) {
+    standards->quark = g_quark_from_static_string (standards->nick);
+    g_hash_table_insert (_nick_to_query, standards->nick, standards);
+    g_hash_table_insert (_query_type_to_nick,
+        GINT_TO_POINTER (standards->value), standards);
+
+    _gst_queries = g_list_append (_gst_queries, standards);
+    standards++;
+    _n_values++;
+  }
+  g_static_mutex_unlock (&mutex);
+
+  g_type_class_ref (gst_query_get_type ());
+}
+
+/**
+ * gst_query_type_get_name:
+ * @query: the query type
+ *
+ * Get a printable name for the given query type. Do not modify or free.
+ *
+ * Returns: a reference to the static name of the query.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+const gchar *
+gst_query_type_get_name (GstQueryType query)
+{
+  const GstQueryTypeDefinition *def;
+
+  def = gst_query_type_get_details (query);
+
+  return def->nick;
+}
+
+/**
+ * gst_query_type_to_quark:
+ * @query: the query type
+ *
+ * Get the unique quark for the given query type.
+ *
+ * Returns: the quark associated with the query type
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GQuark
+gst_query_type_to_quark (GstQueryType query)
+{
+  const GstQueryTypeDefinition *def;
+
+  def = gst_query_type_get_details (query);
+
+  return def->quark;
+}
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+
+GType
+gst_query_get_type (void)
+{
+  static GType _gst_query_type;
+
+  if (G_UNLIKELY (_gst_query_type == 0)) {
+    static const GTypeInfo query_info = {
+      sizeof (GstQueryClass),
+      NULL,
+      NULL,
+      gst_query_class_init,
+      NULL,
+      NULL,
+      sizeof (GstQuery),
+      0,
+      NULL,
+      NULL
+    };
+
+    _gst_query_type = g_type_register_static (GST_TYPE_MINI_OBJECT,
+        "GstQuery", &query_info, 0);
+  }
+  return _gst_query_type;
+}
+
+static void
+gst_query_class_init (gpointer g_class, gpointer class_data)
+{
+  GstQueryClass *query_class = GST_QUERY_CLASS (g_class);
+
+  parent_class = g_type_class_peek_parent (g_class);
+
+  query_class->mini_object_class.copy =
+      (GstMiniObjectCopyFunction) _gst_query_copy;
+  query_class->mini_object_class.finalize =
+      (GstMiniObjectFinalizeFunction) gst_query_finalize;
+
+}
+
+static void
+gst_query_finalize (GstQuery * query)
+{
+  g_return_if_fail (query != NULL);
+
+  if (query->structure) {
+    gst_structure_set_parent_refcount (query->structure, NULL);
+    gst_structure_free (query->structure);
+  }
+
+  GST_MINI_OBJECT_CLASS (parent_class)->finalize (GST_MINI_OBJECT (query));
+}
+
+static GstQuery *
+_gst_query_copy (GstQuery * query)
+{
+  GstQuery *copy;
+
+  copy = (GstQuery *) gst_mini_object_new (GST_TYPE_QUERY);
+
+  copy->type = query->type;
+
+  if (query->structure) {
+    copy->structure = gst_structure_copy (query->structure);
+    gst_structure_set_parent_refcount (copy->structure,
+        &query->mini_object.refcount);
+  }
+
+  return copy;
+}
+
+
+
+/**
+ * gst_query_type_register:
+ * @nick: The nick of the new query
+ * @description: The description of the new query
+ *
+ * Create a new GstQueryType based on the nick or return an
+ * already registered query with that nick
+ *
+ * Returns: A new GstQueryType or an already registered query
+ * with the same nick.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstQueryType
+gst_query_type_register (const gchar * nick, const gchar * description)
+{
+  GstQueryTypeDefinition *query;
+  GstQueryType lookup;
+
+  g_return_val_if_fail (nick != NULL, 0);
+  g_return_val_if_fail (description != NULL, 0);
+
+  lookup = gst_query_type_get_by_nick (nick);
+  if (lookup != GST_QUERY_NONE)
+    return lookup;
+
+  query = g_new0 (GstQueryTypeDefinition, 1);
+  query->value = _n_values;
+  query->nick = g_strdup (nick);
+  query->description = g_strdup (description);
+  query->quark = g_quark_from_static_string (query->nick);
+
+  g_static_mutex_lock (&mutex);
+  g_hash_table_insert (_nick_to_query, query->nick, query);
+  g_hash_table_insert (_query_type_to_nick, GINT_TO_POINTER (query->value),
+      query);
+  _gst_queries = g_list_append (_gst_queries, query);
+  _n_values++;
+  g_static_mutex_unlock (&mutex);
+
+  return query->value;
+}
+
+/**
+ * gst_query_type_get_by_nick:
+ * @nick: The nick of the query
+ *
+ * Get the query type registered with @nick.
+ *
+ * Returns: The query registered with @nick or #GST_QUERY_NONE
+ * if the query was not registered.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstQueryType
+gst_query_type_get_by_nick (const gchar * nick)
+{
+  GstQueryTypeDefinition *query;
+
+  g_return_val_if_fail (nick != NULL, 0);
+
+  g_static_mutex_lock (&mutex);
+  query = g_hash_table_lookup (_nick_to_query, nick);
+  g_static_mutex_unlock (&mutex);
+
+  if (query != NULL)
+    return query->value;
+  else
+    return GST_QUERY_NONE;
+}
+
+/**
+ * gst_query_types_contains:
+ * @types: The query array to search
+ * @type: the #GstQueryType to find
+ *
+ * See if the given #GstQueryType is inside the @types query types array.
+ *
+ * Returns: TRUE if the type is found inside the array
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+gboolean
+gst_query_types_contains (const GstQueryType * types, GstQueryType type)
+{
+  if (!types)
+    return FALSE;
+
+  while (*types) {
+    if (*types == type)
+      return TRUE;
+
+    types++;
+  }
+  return FALSE;
+}
+
+
+/**
+ * gst_query_type_get_details:
+ * @type: a #GstQueryType
+ *
+ * Get details about the given #GstQueryType.
+ *
+ * Returns: The #GstQueryTypeDefinition for @type or NULL on failure.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+const GstQueryTypeDefinition *
+gst_query_type_get_details (GstQueryType type)
+{
+  const GstQueryTypeDefinition *result;
+
+  g_static_mutex_lock (&mutex);
+  result = g_hash_table_lookup (_query_type_to_nick, GINT_TO_POINTER (type));
+  g_static_mutex_unlock (&mutex);
+
+  return result;
+}
+
+/**
+ * gst_query_type_iterate_definitions:
+ *
+ * Get a #GstIterator of all the registered query types. The definitions 
+ * iterated over are read only.
+ *
+ * Returns: A #GstIterator of #GstQueryTypeDefinition.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstIterator *
+gst_query_type_iterate_definitions (void)
+{
+  GstIterator *result;
+
+  g_static_mutex_lock (&mutex);
+  /* FIXME: register a boxed type for GstQueryTypeDefinition */
+  result = gst_iterator_new_list (G_TYPE_POINTER,
+      g_static_mutex_get_mutex (&mutex), &_n_values, &_gst_queries,
+      NULL, NULL, NULL);
+  g_static_mutex_unlock (&mutex);
+
+  return result;
+}
+
+static GstQuery *
+gst_query_new (GstQueryType type, GstStructure * structure)
+{
+  GstQuery *query;
+
+  query = (GstQuery *) gst_mini_object_new (GST_TYPE_QUERY);
+
+  GST_DEBUG ("creating new query %p %d", query, type);
+
+  query->type = type;
+
+  if (structure) {
+    query->structure = structure;
+    gst_structure_set_parent_refcount (query->structure,
+        &query->mini_object.refcount);
+  } else {
+    query->structure = NULL;
+  }
+
+  return query;
+}
+
+/**
+ * gst_query_new_position:
+ * @format: the default #GstFormat for the new query
+ *
+ * Constructs a new query stream position query object. Use gst_query_unref()
+ * when done with it. A position query is used to query the current position
+ * of playback in the streams, in some format.
+ *
+ * Returns: A #GstQuery
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstQuery *
+gst_query_new_position (GstFormat format)
+{
+  GstQuery *query;
+  GstStructure *structure;
+
+  structure = gst_structure_empty_new ("GstQueryPosition");
+  gst_structure_id_set (structure,
+      GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
+      GST_QUARK (CURRENT), G_TYPE_INT64, (gint64) - 1, NULL);
+
+  query = gst_query_new (GST_QUERY_POSITION, structure);
+
+  return query;
+}
+
+/**
+ * gst_query_set_position:
+ * @query: a #GstQuery with query type GST_QUERY_POSITION
+ * @format: the requested #GstFormat
+ * @cur: the position to set
+ *
+ * Answer a position query by setting the requested value in the given format.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_query_set_position (GstQuery * query, GstFormat format, gint64 cur)
+{
+  GstStructure *structure;
+
+  g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_POSITION);
+
+  structure = gst_query_get_structure (query);
+  gst_structure_id_set (structure,
+      GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
+      GST_QUARK (CURRENT), G_TYPE_INT64, cur, NULL);
+}
+
+/**
+ * gst_query_parse_position:
+ * @query: a #GstQuery
+ * @format: the storage for the #GstFormat of the position values (may be NULL)
+ * @cur: the storage for the current position (may be NULL)
+ *
+ * Parse a position query, writing the format into @format, and the position
+ * into @cur, if the respective parameters are non-NULL.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_query_parse_position (GstQuery * query, GstFormat * format, gint64 * cur)
+{
+  GstStructure *structure;
+
+  g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_POSITION);
+
+  structure = gst_query_get_structure (query);
+  if (format)
+    *format = g_value_get_enum (gst_structure_id_get_value (structure,
+            GST_QUARK (FORMAT)));
+  if (cur)
+    *cur = g_value_get_int64 (gst_structure_id_get_value (structure,
+            GST_QUARK (CURRENT)));
+}
+
+
+/**
+ * gst_query_new_duration:
+ * @format: the #GstFormat for this duration query
+ *
+ * Constructs a new stream duration query object to query in the given format. 
+ * Use gst_query_unref() when done with it. A duration query will give the
+ * total length of the stream.
+ *
+ * Returns: A #GstQuery
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstQuery *
+gst_query_new_duration (GstFormat format)
+{
+  GstQuery *query;
+  GstStructure *structure;
+
+  structure = gst_structure_empty_new ("GstQueryDuration");
+  gst_structure_id_set (structure,
+      GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
+      GST_QUARK (DURATION), G_TYPE_INT64, (gint64) - 1, NULL);
+
+  query = gst_query_new (GST_QUERY_DURATION, structure);
+
+  return query;
+}
+
+/**
+ * gst_query_set_duration:
+ * @query: a #GstQuery
+ * @format: the #GstFormat for the duration
+ * @duration: the duration of the stream
+ *
+ * Answer a duration query by setting the requested value in the given format.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_query_set_duration (GstQuery * query, GstFormat format, gint64 duration)
+{
+  GstStructure *structure;
+
+  g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_DURATION);
+
+  structure = gst_query_get_structure (query);
+  gst_structure_id_set (structure,
+      GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
+      GST_QUARK (DURATION), G_TYPE_INT64, duration, NULL);
+}
+
+/**
+ * gst_query_parse_duration:
+ * @query: a #GstQuery
+ * @format: the storage for the #GstFormat of the duration value, or NULL.
+ * @duration: the storage for the total duration, or NULL.
+ *
+ * Parse a duration query answer. Write the format of the duration into @format,
+ * and the value into @duration, if the respective variables are non-NULL.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_query_parse_duration (GstQuery * query, GstFormat * format,
+    gint64 * duration)
+{
+  GstStructure *structure;
+
+  g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_DURATION);
+
+  structure = gst_query_get_structure (query);
+  if (format)
+    *format = g_value_get_enum (gst_structure_id_get_value (structure,
+            GST_QUARK (FORMAT)));
+  if (duration)
+    *duration = g_value_get_int64 (gst_structure_id_get_value (structure,
+            GST_QUARK (DURATION)));
+}
+
+/**
+ * gst_query_new_latency:
+ *
+ * Constructs a new latency query object. 
+ * Use gst_query_unref() when done with it. A latency query is usually performed
+ * by sinks to compensate for additional latency introduced by elements in the
+ * pipeline.
+ *
+ * Returns: A #GstQuery
+ *
+ * Since: 0.10.12
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstQuery *
+gst_query_new_latency (void)
+{
+  GstQuery *query;
+  GstStructure *structure;
+
+  structure = gst_structure_empty_new ("GstQueryLatency");
+  gst_structure_set (structure,
+      "live", G_TYPE_BOOLEAN, FALSE,
+      "min-latency", G_TYPE_UINT64, (gint64) 0,
+      "max-latency", G_TYPE_UINT64, (gint64) - 1, NULL);
+
+  query = gst_query_new (GST_QUERY_LATENCY, structure);
+
+  return query;
+}
+
+/**
+ * gst_query_set_latency:
+ * @query: a #GstQuery
+ * @live: if there is a live element upstream
+ * @min_latency: the minimal latency of the live element
+ * @max_latency: the maximal latency of the live element
+ *
+ * Answer a latency query by setting the requested values in the given format.
+ *
+ * Since: 0.10.12
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_query_set_latency (GstQuery * query, gboolean live,
+    GstClockTime min_latency, GstClockTime max_latency)
+{
+  GstStructure *structure;
+
+  g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_LATENCY);
+
+  structure = gst_query_get_structure (query);
+  gst_structure_set (structure,
+      "live", G_TYPE_BOOLEAN, live,
+      "min-latency", G_TYPE_UINT64, min_latency,
+      "max-latency", G_TYPE_UINT64, max_latency, NULL);
+}
+
+/**
+ * gst_query_parse_latency:
+ * @query: a #GstQuery
+ * @live: storage for live or NULL 
+ * @min_latency: the storage for the min latency or NULL
+ * @max_latency: the storage for the max latency or NULL
+ *
+ * Parse a latency query answer. 
+ *
+ * Since: 0.10.12
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_query_parse_latency (GstQuery * query, gboolean * live,
+    GstClockTime * min_latency, GstClockTime * max_latency)
+{
+  GstStructure *structure;
+
+  g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_LATENCY);
+
+  structure = gst_query_get_structure (query);
+  if (live)
+    *live = g_value_get_boolean (gst_structure_get_value (structure, "live"));
+  if (min_latency)
+    *min_latency = g_value_get_uint64 (gst_structure_get_value (structure,
+            "min-latency"));
+  if (max_latency)
+    *max_latency = g_value_get_uint64 (gst_structure_get_value (structure,
+            "max-latency"));
+}
+
+/**
+ * gst_query_new_convert:
+ * @src_format: the source #GstFormat for the new query
+ * @value: the value to convert
+ * @dest_format: the target #GstFormat
+ *
+ * Constructs a new convert query object. Use gst_query_unref()
+ * when done with it. A convert query is used to ask for a conversion between
+ * one format and another.
+ *
+ * Returns: A #GstQuery
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstQuery *
+gst_query_new_convert (GstFormat src_format, gint64 value,
+    GstFormat dest_format)
+{
+  GstQuery *query;
+  GstStructure *structure;
+
+  g_return_val_if_fail (value >= 0, NULL);
+
+  structure = gst_structure_empty_new ("GstQueryConvert");
+  gst_structure_id_set (structure,
+      GST_QUARK (SRC_FORMAT), GST_TYPE_FORMAT, src_format,
+      GST_QUARK (SRC_VALUE), G_TYPE_INT64, value,
+      GST_QUARK (DEST_FORMAT), GST_TYPE_FORMAT, dest_format,
+      GST_QUARK (DEST_VALUE), G_TYPE_INT64, (gint64) - 1, NULL);
+
+  query = gst_query_new (GST_QUERY_CONVERT, structure);
+
+  return query;
+}
+
+/**
+ * gst_query_set_convert:
+ * @query: a #GstQuery
+ * @src_format: the source #GstFormat
+ * @src_value: the source value
+ * @dest_format: the destination #GstFormat
+ * @dest_value: the destination value
+ *
+ * Answer a convert query by setting the requested values.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_query_set_convert (GstQuery * query, GstFormat src_format, gint64 src_value,
+    GstFormat dest_format, gint64 dest_value)
+{
+  GstStructure *structure;
+
+  g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_CONVERT);
+
+  structure = gst_query_get_structure (query);
+  gst_structure_id_set (structure,
+      GST_QUARK (SRC_FORMAT), GST_TYPE_FORMAT, src_format,
+      GST_QUARK (SRC_VALUE), G_TYPE_INT64, src_value,
+      GST_QUARK (DEST_FORMAT), GST_TYPE_FORMAT, dest_format,
+      GST_QUARK (DEST_VALUE), G_TYPE_INT64, (gint64) dest_value, NULL);
+}
+
+/**
+ * gst_query_parse_convert:
+ * @query: a #GstQuery
+ * @src_format: the storage for the #GstFormat of the source value, or NULL
+ * @src_value: the storage for the source value, or NULL
+ * @dest_format: the storage for the #GstFormat of the destination value, or NULL
+ * @dest_value: the storage for the destination value, or NULL
+ *
+ * Parse a convert query answer. Any of @src_format, @src_value, @dest_format,
+ * and @dest_value may be NULL, in which case that value is omitted.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_query_parse_convert (GstQuery * query, GstFormat * src_format,
+    gint64 * src_value, GstFormat * dest_format, gint64 * dest_value)
+{
+  GstStructure *structure;
+
+  g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_CONVERT);
+
+  structure = gst_query_get_structure (query);
+  if (src_format)
+    *src_format = g_value_get_enum (gst_structure_id_get_value (structure,
+            GST_QUARK (SRC_FORMAT)));
+  if (src_value)
+    *src_value = g_value_get_int64 (gst_structure_id_get_value (structure,
+            GST_QUARK (SRC_VALUE)));
+  if (dest_format)
+    *dest_format = g_value_get_enum (gst_structure_id_get_value (structure,
+            GST_QUARK (DEST_FORMAT)));
+  if (dest_value)
+    *dest_value = g_value_get_int64 (gst_structure_id_get_value (structure,
+            GST_QUARK (DEST_VALUE)));
+}
+
+/**
+ * gst_query_new_segment:
+ * @format: the #GstFormat for the new query
+ *
+ * Constructs a new segment query object. Use gst_query_unref()
+ * when done with it. A segment query is used to discover information about the
+ * currently configured segment for playback.
+ *
+ * Returns: a #GstQuery
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstQuery *
+gst_query_new_segment (GstFormat format)
+{
+  GstQuery *query;
+  GstStructure *structure;
+
+  structure = gst_structure_empty_new ("GstQuerySegment");
+  gst_structure_id_set (structure,
+      GST_QUARK (RATE), G_TYPE_DOUBLE, (gdouble) 0.0,
+      GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
+      GST_QUARK (START_VALUE), G_TYPE_INT64, (gint64) - 1,
+      GST_QUARK (STOP_VALUE), G_TYPE_INT64, (gint64) - 1, NULL);
+
+  query = gst_query_new (GST_QUERY_SEGMENT, structure);
+
+  return query;
+}
+
+/**
+ * gst_query_set_segment:
+ * @query: a #GstQuery
+ * @rate: the rate of the segment
+ * @format: the #GstFormat of the segment values (@start_value and @stop_value)
+ * @start_value: the start value
+ * @stop_value: the stop value
+ *
+ * Answer a segment query by setting the requested values. The normal
+ * playback segment of a pipeline is 0 to duration at the default rate of
+ * 1.0. If a seek was performed on the pipeline to play a different
+ * segment, this query will return the range specified in the last seek.
+ *
+ * @start_value and @stop_value will respectively contain the configured 
+ * playback range start and stop values expressed in @format. 
+ * The values are always between 0 and the duration of the media and 
+ * @start_value <= @stop_value. @rate will contain the playback rate. For
+ * negative rates, playback will actually happen from @stop_value to
+ * @start_value.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_query_set_segment (GstQuery * query, gdouble rate, GstFormat format,
+    gint64 start_value, gint64 stop_value)
+{
+  GstStructure *structure;
+
+  g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_SEGMENT);
+
+  structure = gst_query_get_structure (query);
+  gst_structure_id_set (structure,
+      GST_QUARK (RATE), G_TYPE_DOUBLE, rate,
+      GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
+      GST_QUARK (START_VALUE), G_TYPE_INT64, start_value,
+      GST_QUARK (STOP_VALUE), G_TYPE_INT64, stop_value, NULL);
+}
+
+/**
+ * gst_query_parse_segment:
+ * @query: a #GstQuery
+ * @rate: the storage for the rate of the segment, or NULL
+ * @format: the storage for the #GstFormat of the values, or NULL
+ * @start_value: the storage for the start value, or NULL
+ * @stop_value: the storage for the stop value, or NULL
+ *
+ * Parse a segment query answer. Any of @rate, @format, @start_value, and 
+ * @stop_value may be NULL, which will cause this value to be omitted.
+ *
+ * See gst_query_set_segment() for an explanation of the function arguments.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_query_parse_segment (GstQuery * query, gdouble * rate, GstFormat * format,
+    gint64 * start_value, gint64 * stop_value)
+{
+  GstStructure *structure;
+
+  g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_SEGMENT);
+
+  structure = gst_query_get_structure (query);
+  if (rate)
+    *rate = g_value_get_double (gst_structure_id_get_value (structure,
+            GST_QUARK (RATE)));
+  if (format)
+    *format = g_value_get_enum (gst_structure_id_get_value (structure,
+            GST_QUARK (FORMAT)));
+  if (start_value)
+    *start_value = g_value_get_int64 (gst_structure_id_get_value (structure,
+            GST_QUARK (START_VALUE)));
+  if (stop_value)
+    *stop_value = g_value_get_int64 (gst_structure_id_get_value (structure,
+            GST_QUARK (STOP_VALUE)));
+}
+
+/**
+ * gst_query_new_application:
+ * @type: the query type
+ * @structure: a structure for the query
+ *
+ * Constructs a new custom application query object. Use gst_query_unref()
+ * when done with it.
+ *
+ * Returns: a #GstQuery
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstQuery *
+gst_query_new_application (GstQueryType type, GstStructure * structure)
+{
+  g_return_val_if_fail (gst_query_type_get_details (type) != NULL, NULL);
+  g_return_val_if_fail (structure != NULL, NULL);
+
+  return gst_query_new (type, structure);
+}
+
+/**
+ * gst_query_get_structure:
+ * @query: a #GstQuery
+ *
+ * Get the structure of a query.
+ *
+ * Returns: The #GstStructure of the query. The structure is still owned
+ * by the query and will therefore be freed when the query is unreffed.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstStructure *
+gst_query_get_structure (GstQuery * query)
+{
+  g_return_val_if_fail (GST_IS_QUERY (query), NULL);
+
+  return query->structure;
+}
+
+/**
+ * gst_query_new_seeking (GstFormat *format)
+ * @format: the default #GstFormat for the new query
+ *
+ * Constructs a new query object for querying seeking properties of
+ * the stream. 
+ *
+ * Returns: A #GstQuery
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif 
+GstQuery *
+gst_query_new_seeking (GstFormat format)
+{
+  GstQuery *query;
+  GstStructure *structure;
+
+  structure = gst_structure_empty_new ("GstQuerySeeking");
+  gst_structure_id_set (structure,
+      GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
+      GST_QUARK (SEEKABLE), G_TYPE_BOOLEAN, FALSE,
+      GST_QUARK (SEGMENT_START), G_TYPE_INT64, (gint64) - 1,
+      GST_QUARK (SEGMENT_END), G_TYPE_INT64, (gint64) - 1, NULL);
+
+  query = gst_query_new (GST_QUERY_SEEKING, structure);
+
+  return query;
+}
+
+/**
+ * gst_query_set_seeking:
+ * @query: a #GstQuery
+ * @format: the format to set for the @segment_start and @segment_end values
+ * @seekable: the seekable flag to set
+ * @segment_start: the segment_start to set
+ * @segment_end: the segment_end to set
+ *
+ * Set the seeking query result fields in @query.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_query_set_seeking (GstQuery * query, GstFormat format,
+    gboolean seekable, gint64 segment_start, gint64 segment_end)
+{
+  GstStructure *structure;
+
+  g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_SEEKING);
+
+  structure = gst_query_get_structure (query);
+  gst_structure_id_set (structure,
+      GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
+      GST_QUARK (SEEKABLE), G_TYPE_BOOLEAN, seekable,
+      GST_QUARK (SEGMENT_START), G_TYPE_INT64, segment_start,
+      GST_QUARK (SEGMENT_END), G_TYPE_INT64, segment_end, NULL);
+}
+
+/**
+ * gst_query_parse_seeking:
+ * @query: a GST_QUERY_SEEKING type query #GstQuery
+ * @format: the format to set for the @segment_start and @segment_end values
+ * @seekable: the seekable flag to set
+ * @segment_start: the segment_start to set
+ * @segment_end: the segment_end to set
+ *
+ * Parse a seeking query, writing the format into @format, and 
+ * other results into the passed parameters, if the respective parameters
+ * are non-NULL
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_query_parse_seeking (GstQuery * query, GstFormat * format,
+    gboolean * seekable, gint64 * segment_start, gint64 * segment_end)
+{
+  GstStructure *structure;
+
+  g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_SEEKING);
+
+  structure = gst_query_get_structure (query);
+  if (format)
+    *format = g_value_get_enum (gst_structure_id_get_value (structure,
+            GST_QUARK (FORMAT)));
+  if (seekable)
+    *seekable = g_value_get_boolean (gst_structure_id_get_value (structure,
+            GST_QUARK (SEEKABLE)));
+  if (segment_start)
+    *segment_start = g_value_get_int64 (gst_structure_id_get_value (structure,
+            GST_QUARK (SEGMENT_START)));
+  if (segment_end)
+    *segment_end = g_value_get_int64 (gst_structure_id_get_value (structure,
+            GST_QUARK (SEGMENT_END)));
+}
+
+/**
+ * gst_query_new_formats:
+ *
+ * Constructs a new query object for querying formats of
+ * the stream. 
+ *
+ * Returns: A #GstQuery
+ *
+ * Since: 0.10.4
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GstQuery *
+gst_query_new_formats (void)
+{
+  GstQuery *query;
+  GstStructure *structure;
+
+  structure = gst_structure_new ("GstQueryFormats", NULL);
+  query = gst_query_new (GST_QUERY_FORMATS, structure);
+
+  return query;
+}
+
+static void
+gst_query_list_add_format (GValue * list, GstFormat format)
+{
+  GValue item = { 0, };
+
+  g_value_init (&item, GST_TYPE_FORMAT);
+  g_value_set_enum (&item, format);
+  gst_value_list_append_value (list, &item);
+  g_value_unset (&item);
+}
+
+/**
+ * gst_query_set_formats:
+ * @query: a #GstQuery
+ * @n_formats: the number of formats to set.
+ * @...: A number of @GstFormats equal to @n_formats.
+ *
+ * Set the formats query result fields in @query. The number of formats passed
+ * must be equal to @n_formats.
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_query_set_formats (GstQuery * query, gint n_formats, ...)
+{
+  va_list ap;
+  GValue list = { 0, };
+  GstStructure *structure;
+  gint i;
+
+  g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_FORMATS);
+
+  g_value_init (&list, GST_TYPE_LIST);
+
+  va_start (ap, n_formats);
+  for (i = 0; i < n_formats; i++) {
+    gst_query_list_add_format (&list, va_arg (ap, GstFormat));
+  }
+  va_end (ap);
+
+  structure = gst_query_get_structure (query);
+  gst_structure_set_value (structure, "formats", &list);
+
+  g_value_unset (&list);
+
+}
+
+/**
+ * gst_query_set_formatsv:
+ * @query: a #GstQuery
+ * @n_formats: the number of formats to set.
+ * @formats: An array containing @n_formats @GstFormat values.
+ *
+ * Set the formats query result fields in @query. The number of formats passed
+ * in the @formats array must be equal to @n_formats.
+ *
+ * Since: 0.10.4
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_query_set_formatsv (GstQuery * query, gint n_formats, GstFormat * formats)
+{
+  GValue list = { 0, };
+  GstStructure *structure;
+  gint i;
+
+  g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_FORMATS);
+
+  g_value_init (&list, GST_TYPE_LIST);
+  for (i = 0; i < n_formats; i++) {
+    gst_query_list_add_format (&list, formats[i]);
+  }
+  structure = gst_query_get_structure (query);
+  gst_structure_set_value (structure, "formats", &list);
+
+  g_value_unset (&list);
+}
+
+/**
+ * gst_query_parse_formats_length:
+ * @query: a #GstQuery
+ * @n_formats: the number of formats in this query.
+ *
+ * Parse the number of formats in the formats @query. 
+ *
+ * Since: 0.10.4
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_query_parse_formats_length (GstQuery * query, guint * n_formats)
+{
+  GstStructure *structure;
+
+  g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_FORMATS);
+
+  if (n_formats) {
+    const GValue *list;
+
+    structure = gst_query_get_structure (query);
+    list = gst_structure_get_value (structure, "formats");
+    if (list == NULL)
+      *n_formats = 0;
+    else
+      *n_formats = gst_value_list_get_size (list);
+  }
+}
+
+/**
+ * gst_query_parse_formats_nth:
+ * @query: a #GstQuery
+ * @nth: the nth format to retrieve.
+ * @format: a pointer to store the nth format
+ *
+ * Parse the format query and retrieve the @nth format from it into 
+ * @format. If the list contains less elements than @nth, @format will be
+ * set to GST_FORMAT_UNDEFINED.
+ *
+ * Since: 0.10.4
+ */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+void
+gst_query_parse_formats_nth (GstQuery * query, guint nth, GstFormat * format)
+{
+  GstStructure *structure;
+
+  g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_FORMATS);
+
+  if (format) {
+    const GValue *list;
+
+    structure = gst_query_get_structure (query);
+    list = gst_structure_get_value (structure, "formats");
+    if (list == NULL) {
+      *format = GST_FORMAT_UNDEFINED;
+    } else {
+      if (nth < gst_value_list_get_size (list)) {
+        *format = g_value_get_enum (gst_value_list_get_value (list, nth));
+      } else
+        *format = GST_FORMAT_UNDEFINED;
+    }
+  }
+}