--- /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, &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;
+ }
+ }
+}