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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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Add convenience wrapper for gst_structure_id_empty_new() plus gst_structure_id_set() and use it in a few places. API: gst_structure_id_new()
1353 lines
38 KiB
C
1353 lines
38 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wim.taymans@chello.be>
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* 2005 Wim Taymans <wim@fluendo.com>
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*
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* gstquery.c: GstQueryType registration and Query parsing/creation
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:gstquery
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* @short_description: Dynamically register new query types. Provide functions
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* to create queries, and to set and parse values in them.
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* @see_also: #GstPad, #GstElement
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*
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* GstQuery functions are used to register a new query types to the gstreamer
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* core.
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* Query types can be used to perform queries on pads and elements.
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*
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* Queries can be created using the gst_query_new_xxx() functions.
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* Query values can be set using gst_query_set_xxx(), and parsed using
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* gst_query_parse_xxx() helpers.
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*
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* The following example shows how to query the duration of a pipeline:
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*
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* <example>
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* <title>Query duration on a pipeline</title>
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* <programlisting>
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* GstQuery *query;
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* gboolean res;
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* query = gst_query_new_duration (GST_FORMAT_TIME);
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* res = gst_element_query (pipeline, query);
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* if (res) {
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* gint64 duration;
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* gst_query_parse_duration (query, NULL, &duration);
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* g_print ("duration = %"GST_TIME_FORMAT, GST_TIME_ARGS (duration));
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* }
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* else {
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* g_print ("duration query failed...");
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* }
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* gst_query_unref (query);
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* </programlisting>
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* </example>
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*
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* Last reviewed on 2006-02-14 (0.10.4)
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*/
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#include "gst_private.h"
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#include "gstinfo.h"
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#include "gstquery.h"
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#include "gstvalue.h"
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#include "gstenumtypes.h"
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#include "gstquark.h"
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#include "gsturi.h"
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GST_DEBUG_CATEGORY_STATIC (gst_query_debug);
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#define GST_CAT_DEFAULT gst_query_debug
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static void gst_query_finalize (GstQuery * query);
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static GstQuery *_gst_query_copy (GstQuery * query);
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static GStaticMutex mutex = G_STATIC_MUTEX_INIT;
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static GList *_gst_queries = NULL;
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static GHashTable *_nick_to_query = NULL;
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static GHashTable *_query_type_to_nick = NULL;
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static guint32 _n_values = 1; /* we start from 1 because 0 reserved for NONE */
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static GstMiniObjectClass *parent_class = NULL;
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static GstQueryTypeDefinition standard_definitions[] = {
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{GST_QUERY_POSITION, "position", "Current position", 0},
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{GST_QUERY_DURATION, "duration", "Total duration", 0},
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{GST_QUERY_LATENCY, "latency", "Latency", 0},
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{GST_QUERY_JITTER, "jitter", "Jitter", 0},
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{GST_QUERY_RATE, "rate", "Configured rate 1000000 = 1", 0},
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{GST_QUERY_SEEKING, "seeking", "Seeking capabilities and parameters", 0},
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{GST_QUERY_SEGMENT, "segment", "currently configured segment", 0},
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{GST_QUERY_CONVERT, "convert", "Converting between formats", 0},
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{GST_QUERY_FORMATS, "formats", "Supported formats for conversion", 0},
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{GST_QUERY_BUFFERING, "buffering", "Buffering status", 0},
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{GST_QUERY_CUSTOM, "custom", "Custom query", 0},
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{GST_QUERY_URI, "uri", "URI of the source or sink", 0},
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{0, NULL, NULL, 0}
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};
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void
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_gst_query_initialize (void)
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{
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GstQueryTypeDefinition *standards = standard_definitions;
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GST_CAT_INFO (GST_CAT_GST_INIT, "init queries");
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GST_DEBUG_CATEGORY_INIT (gst_query_debug, "query", 0, "query system");
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g_static_mutex_lock (&mutex);
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if (_nick_to_query == NULL) {
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_nick_to_query = g_hash_table_new (g_str_hash, g_str_equal);
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_query_type_to_nick = g_hash_table_new (NULL, NULL);
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}
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while (standards->nick) {
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standards->quark = g_quark_from_static_string (standards->nick);
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g_hash_table_insert (_nick_to_query, standards->nick, standards);
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g_hash_table_insert (_query_type_to_nick,
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GINT_TO_POINTER (standards->value), standards);
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_gst_queries = g_list_append (_gst_queries, standards);
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standards++;
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_n_values++;
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}
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g_static_mutex_unlock (&mutex);
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g_type_class_ref (gst_query_get_type ());
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}
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/**
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* gst_query_type_get_name:
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* @query: the query type
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*
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* Get a printable name for the given query type. Do not modify or free.
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*
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* Returns: a reference to the static name of the query.
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*/
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const gchar *
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gst_query_type_get_name (GstQueryType query)
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{
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const GstQueryTypeDefinition *def;
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def = gst_query_type_get_details (query);
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return def->nick;
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}
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/**
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* gst_query_type_to_quark:
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* @query: the query type
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*
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* Get the unique quark for the given query type.
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*
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* Returns: the quark associated with the query type
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*/
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GQuark
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gst_query_type_to_quark (GstQueryType query)
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{
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const GstQueryTypeDefinition *def;
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def = gst_query_type_get_details (query);
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return def->quark;
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}
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G_DEFINE_TYPE (GstQuery, gst_query, GST_TYPE_MINI_OBJECT);
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static void
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gst_query_class_init (GstQueryClass * klass)
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{
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parent_class = g_type_class_peek_parent (klass);
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klass->mini_object_class.copy = (GstMiniObjectCopyFunction) _gst_query_copy;
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klass->mini_object_class.finalize =
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(GstMiniObjectFinalizeFunction) gst_query_finalize;
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}
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static void
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gst_query_init (GstQuery * query)
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{
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}
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static void
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gst_query_finalize (GstQuery * query)
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{
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g_return_if_fail (query != NULL);
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if (query->structure) {
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gst_structure_set_parent_refcount (query->structure, NULL);
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gst_structure_free (query->structure);
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}
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GST_MINI_OBJECT_CLASS (parent_class)->finalize (GST_MINI_OBJECT (query));
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}
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static GstQuery *
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_gst_query_copy (GstQuery * query)
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{
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GstQuery *copy;
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copy = (GstQuery *) gst_mini_object_new (GST_TYPE_QUERY);
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copy->type = query->type;
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if (query->structure) {
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copy->structure = gst_structure_copy (query->structure);
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gst_structure_set_parent_refcount (copy->structure,
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&query->mini_object.refcount);
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}
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return copy;
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}
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/**
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* gst_query_type_register:
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* @nick: The nick of the new query
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* @description: The description of the new query
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*
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* Create a new GstQueryType based on the nick or return an
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* already registered query with that nick
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*
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* Returns: A new GstQueryType or an already registered query
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* with the same nick.
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*/
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GstQueryType
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gst_query_type_register (const gchar * nick, const gchar * description)
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{
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GstQueryTypeDefinition *query;
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GstQueryType lookup;
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g_return_val_if_fail (nick != NULL, 0);
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g_return_val_if_fail (description != NULL, 0);
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lookup = gst_query_type_get_by_nick (nick);
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if (lookup != GST_QUERY_NONE)
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return lookup;
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query = g_new0 (GstQueryTypeDefinition, 1);
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query->value = _n_values;
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query->nick = g_strdup (nick);
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query->description = g_strdup (description);
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query->quark = g_quark_from_static_string (query->nick);
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g_static_mutex_lock (&mutex);
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g_hash_table_insert (_nick_to_query, query->nick, query);
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g_hash_table_insert (_query_type_to_nick, GINT_TO_POINTER (query->value),
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query);
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_gst_queries = g_list_append (_gst_queries, query);
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_n_values++;
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g_static_mutex_unlock (&mutex);
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return query->value;
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}
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/**
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* gst_query_type_get_by_nick:
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* @nick: The nick of the query
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*
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* Get the query type registered with @nick.
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*
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* Returns: The query registered with @nick or #GST_QUERY_NONE
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* if the query was not registered.
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*/
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GstQueryType
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gst_query_type_get_by_nick (const gchar * nick)
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{
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GstQueryTypeDefinition *query;
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g_return_val_if_fail (nick != NULL, 0);
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g_static_mutex_lock (&mutex);
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query = g_hash_table_lookup (_nick_to_query, nick);
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g_static_mutex_unlock (&mutex);
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if (query != NULL)
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return query->value;
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else
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return GST_QUERY_NONE;
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}
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/**
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* gst_query_types_contains:
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* @types: The query array to search
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* @type: the #GstQueryType to find
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*
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* See if the given #GstQueryType is inside the @types query types array.
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*
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* Returns: TRUE if the type is found inside the array
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*/
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gboolean
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gst_query_types_contains (const GstQueryType * types, GstQueryType type)
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{
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if (!types)
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return FALSE;
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while (*types) {
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if (*types == type)
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return TRUE;
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types++;
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}
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return FALSE;
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}
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/**
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* gst_query_type_get_details:
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* @type: a #GstQueryType
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*
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* Get details about the given #GstQueryType.
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*
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* Returns: The #GstQueryTypeDefinition for @type or NULL on failure.
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*/
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const GstQueryTypeDefinition *
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gst_query_type_get_details (GstQueryType type)
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{
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const GstQueryTypeDefinition *result;
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g_static_mutex_lock (&mutex);
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result = g_hash_table_lookup (_query_type_to_nick, GINT_TO_POINTER (type));
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g_static_mutex_unlock (&mutex);
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return result;
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}
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/**
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* gst_query_type_iterate_definitions:
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*
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* Get a #GstIterator of all the registered query types. The definitions
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* iterated over are read only.
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*
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* Returns: A #GstIterator of #GstQueryTypeDefinition.
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*/
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GstIterator *
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gst_query_type_iterate_definitions (void)
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{
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GstIterator *result;
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g_static_mutex_lock (&mutex);
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/* FIXME: register a boxed type for GstQueryTypeDefinition */
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result = gst_iterator_new_list (G_TYPE_POINTER,
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g_static_mutex_get_mutex (&mutex), &_n_values, &_gst_queries,
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NULL, NULL, NULL);
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g_static_mutex_unlock (&mutex);
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return result;
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}
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static GstQuery *
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gst_query_new (GstQueryType type, GstStructure * structure)
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{
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GstQuery *query;
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query = (GstQuery *) gst_mini_object_new (GST_TYPE_QUERY);
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GST_DEBUG ("creating new query %p %d", query, type);
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query->type = type;
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if (structure) {
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query->structure = structure;
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gst_structure_set_parent_refcount (query->structure,
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&query->mini_object.refcount);
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} else {
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query->structure = NULL;
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}
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return query;
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}
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/**
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* gst_query_new_position:
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* @format: the default #GstFormat for the new query
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*
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* Constructs a new query stream position query object. Use gst_query_unref()
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* when done with it. A position query is used to query the current position
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* of playback in the streams, in some format.
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*
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* Returns: A #GstQuery
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*/
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GstQuery *
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gst_query_new_position (GstFormat format)
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{
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GstQuery *query;
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GstStructure *structure;
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structure = gst_structure_id_new (GST_QUARK (QUERY_POSITION),
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GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
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GST_QUARK (CURRENT), G_TYPE_INT64, G_GINT64_CONSTANT (-1), NULL);
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query = gst_query_new (GST_QUERY_POSITION, structure);
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return query;
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}
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/**
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* gst_query_set_position:
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* @query: a #GstQuery with query type GST_QUERY_POSITION
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* @format: the requested #GstFormat
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* @cur: the position to set
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*
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* Answer a position query by setting the requested value in the given format.
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*/
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void
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gst_query_set_position (GstQuery * query, GstFormat format, gint64 cur)
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{
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GstStructure *structure;
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g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_POSITION);
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structure = gst_query_get_structure (query);
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gst_structure_id_set (structure,
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GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
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GST_QUARK (CURRENT), G_TYPE_INT64, cur, NULL);
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}
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/**
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* gst_query_parse_position:
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* @query: a #GstQuery
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* @format: the storage for the #GstFormat of the position values (may be NULL)
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* @cur: the storage for the current position (may be NULL)
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*
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* Parse a position query, writing the format into @format, and the position
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* into @cur, if the respective parameters are non-NULL.
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*/
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void
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gst_query_parse_position (GstQuery * query, GstFormat * format, gint64 * cur)
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{
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GstStructure *structure;
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g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_POSITION);
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structure = gst_query_get_structure (query);
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if (format)
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*format = g_value_get_enum (gst_structure_id_get_value (structure,
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GST_QUARK (FORMAT)));
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if (cur)
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*cur = g_value_get_int64 (gst_structure_id_get_value (structure,
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GST_QUARK (CURRENT)));
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}
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/**
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* gst_query_new_duration:
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* @format: the #GstFormat for this duration query
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*
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* Constructs a new stream duration query object to query in the given format.
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* Use gst_query_unref() when done with it. A duration query will give the
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* total length of the stream.
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*
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* Returns: A #GstQuery
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*/
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GstQuery *
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gst_query_new_duration (GstFormat format)
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{
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GstQuery *query;
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GstStructure *structure;
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structure = gst_structure_id_new (GST_QUARK (QUERY_DURATION),
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GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
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GST_QUARK (DURATION), G_TYPE_INT64, G_GINT64_CONSTANT (-1), NULL);
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query = gst_query_new (GST_QUERY_DURATION, structure);
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return query;
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}
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/**
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* gst_query_set_duration:
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* @query: a #GstQuery
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* @format: the #GstFormat for the duration
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* @duration: the duration of the stream
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*
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* Answer a duration query by setting the requested value in the given format.
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*/
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void
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gst_query_set_duration (GstQuery * query, GstFormat format, gint64 duration)
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{
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GstStructure *structure;
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g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_DURATION);
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structure = gst_query_get_structure (query);
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gst_structure_id_set (structure,
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GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
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GST_QUARK (DURATION), G_TYPE_INT64, duration, NULL);
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}
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/**
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* gst_query_parse_duration:
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* @query: a #GstQuery
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* @format: the storage for the #GstFormat of the duration value, or NULL.
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* @duration: the storage for the total duration, or NULL.
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*
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* Parse a duration query answer. Write the format of the duration into @format,
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* and the value into @duration, if the respective variables are non-NULL.
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*/
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void
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gst_query_parse_duration (GstQuery * query, GstFormat * format,
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gint64 * duration)
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{
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GstStructure *structure;
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g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_DURATION);
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structure = gst_query_get_structure (query);
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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
|
|
*/
|
|
GstQuery *
|
|
gst_query_new_latency (void)
|
|
{
|
|
GstQuery *query;
|
|
GstStructure *structure;
|
|
|
|
structure = gst_structure_id_new (GST_QUARK (QUERY_LATENCY),
|
|
GST_QUARK (LIVE), G_TYPE_BOOLEAN, FALSE,
|
|
GST_QUARK (MIN_LATENCY), G_TYPE_UINT64, G_GUINT64_CONSTANT (0),
|
|
GST_QUARK (MAX_LATENCY), G_TYPE_UINT64, G_GUINT64_CONSTANT (-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
|
|
*/
|
|
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_id_set (structure,
|
|
GST_QUARK (LIVE), G_TYPE_BOOLEAN, live,
|
|
GST_QUARK (MIN_LATENCY), G_TYPE_UINT64, min_latency,
|
|
GST_QUARK (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
|
|
*/
|
|
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_id_get_value (structure,
|
|
GST_QUARK (LIVE)));
|
|
if (min_latency)
|
|
*min_latency = g_value_get_uint64 (gst_structure_id_get_value (structure,
|
|
GST_QUARK (MIN_LATENCY)));
|
|
if (max_latency)
|
|
*max_latency = g_value_get_uint64 (gst_structure_id_get_value (structure,
|
|
GST_QUARK (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
|
|
*/
|
|
GstQuery *
|
|
gst_query_new_convert (GstFormat src_format, gint64 value,
|
|
GstFormat dest_format)
|
|
{
|
|
GstQuery *query;
|
|
GstStructure *structure;
|
|
|
|
structure = gst_structure_id_new (GST_QUARK (QUERY_CONVERT),
|
|
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, G_GINT64_CONSTANT (-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.
|
|
*/
|
|
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, 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.
|
|
*/
|
|
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
|
|
*/
|
|
GstQuery *
|
|
gst_query_new_segment (GstFormat format)
|
|
{
|
|
GstQuery *query;
|
|
GstStructure *structure;
|
|
|
|
structure = gst_structure_id_new (GST_QUARK (QUERY_SEGMENT),
|
|
GST_QUARK (RATE), G_TYPE_DOUBLE, (gdouble) 0.0,
|
|
GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
|
|
GST_QUARK (START_VALUE), G_TYPE_INT64, G_GINT64_CONSTANT (-1),
|
|
GST_QUARK (STOP_VALUE), G_TYPE_INT64, G_GINT64_CONSTANT (-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.
|
|
*/
|
|
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.
|
|
*/
|
|
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
|
|
*/
|
|
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.
|
|
*/
|
|
GstStructure *
|
|
gst_query_get_structure (GstQuery * query)
|
|
{
|
|
g_return_val_if_fail (GST_IS_QUERY (query), NULL);
|
|
|
|
return query->structure;
|
|
}
|
|
|
|
/**
|
|
* gst_query_new_seeking:
|
|
* @format: the default #GstFormat for the new query
|
|
*
|
|
* Constructs a new query object for querying seeking properties of
|
|
* the stream.
|
|
*
|
|
* Returns: A #GstQuery
|
|
*/
|
|
GstQuery *
|
|
gst_query_new_seeking (GstFormat format)
|
|
{
|
|
GstQuery *query;
|
|
GstStructure *structure;
|
|
|
|
structure = gst_structure_id_new (GST_QUARK (QUERY_SEEKING),
|
|
GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
|
|
GST_QUARK (SEEKABLE), G_TYPE_BOOLEAN, FALSE,
|
|
GST_QUARK (SEGMENT_START), G_TYPE_INT64, G_GINT64_CONSTANT (-1),
|
|
GST_QUARK (SEGMENT_END), G_TYPE_INT64, G_GINT64_CONSTANT (-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.
|
|
*/
|
|
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
|
|
*/
|
|
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
|
|
*/
|
|
GstQuery *
|
|
gst_query_new_formats (void)
|
|
{
|
|
GstQuery *query;
|
|
GstStructure *structure;
|
|
|
|
structure = gst_structure_id_empty_new (GST_QUARK (QUERY_FORMATS));
|
|
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.
|
|
*/
|
|
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
|
|
*/
|
|
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
|
|
*/
|
|
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
|
|
*/
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_query_new_buffering
|
|
* @format: the default #GstFormat for the new query
|
|
*
|
|
* Constructs a new query object for querying the buffering status of
|
|
* a stream.
|
|
*
|
|
* Returns: A #GstQuery
|
|
*
|
|
* Since: 0.10.20
|
|
*/
|
|
GstQuery *
|
|
gst_query_new_buffering (GstFormat format)
|
|
{
|
|
GstQuery *query;
|
|
GstStructure *structure;
|
|
|
|
/* by default, we configure the answer as no buffering with a 100% buffering
|
|
* progress */
|
|
structure = gst_structure_id_new (GST_QUARK (QUERY_BUFFERING),
|
|
GST_QUARK (BUSY), G_TYPE_BOOLEAN, FALSE,
|
|
GST_QUARK (BUFFER_PERCENT), G_TYPE_INT, 100,
|
|
GST_QUARK (BUFFERING_MODE), GST_TYPE_BUFFERING_MODE, GST_BUFFERING_STREAM,
|
|
GST_QUARK (AVG_IN_RATE), G_TYPE_INT, -1,
|
|
GST_QUARK (AVG_OUT_RATE), G_TYPE_INT, -1,
|
|
GST_QUARK (BUFFERING_LEFT), G_TYPE_INT64, G_GINT64_CONSTANT (0),
|
|
GST_QUARK (ESTIMATED_TOTAL), G_TYPE_INT64, G_GINT64_CONSTANT (-1),
|
|
GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
|
|
GST_QUARK (START_VALUE), G_TYPE_INT64, G_GINT64_CONSTANT (-1),
|
|
GST_QUARK (STOP_VALUE), G_TYPE_INT64, G_GINT64_CONSTANT (-1), NULL);
|
|
|
|
query = gst_query_new (GST_QUERY_BUFFERING, structure);
|
|
|
|
return query;
|
|
}
|
|
|
|
/**
|
|
* gst_query_set_buffering_percent
|
|
* @query: A valid #GstQuery of type GST_QUERY_BUFFERING.
|
|
* @busy: if buffering is busy
|
|
* @percent: a buffering percent
|
|
*
|
|
* Set the percentage of buffered data. This is a value between 0 and 100.
|
|
* The @busy indicator is %TRUE when the buffering is in progress.
|
|
*
|
|
* Since: 0.10.20
|
|
*/
|
|
void
|
|
gst_query_set_buffering_percent (GstQuery * query, gboolean busy, gint percent)
|
|
{
|
|
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_BUFFERING);
|
|
g_return_if_fail (percent >= 0 && percent <= 100);
|
|
|
|
gst_structure_id_set (query->structure,
|
|
GST_QUARK (BUSY), G_TYPE_BOOLEAN, busy,
|
|
GST_QUARK (BUFFER_PERCENT), G_TYPE_INT, percent, NULL);
|
|
}
|
|
|
|
/**
|
|
* gst_query_parse_buffering_percent
|
|
* @query: A valid #GstQuery of type GST_QUERY_BUFFERING.
|
|
* @busy: if buffering is busy
|
|
* @percent: a buffering percent
|
|
*
|
|
* Get the percentage of buffered data. This is a value between 0 and 100.
|
|
* The @busy indicator is %TRUE when the buffering is in progress.
|
|
*
|
|
* Since: 0.10.20
|
|
*/
|
|
void
|
|
gst_query_parse_buffering_percent (GstQuery * query, gboolean * busy,
|
|
gint * percent)
|
|
{
|
|
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_BUFFERING);
|
|
|
|
if (busy)
|
|
*busy = g_value_get_boolean (gst_structure_id_get_value (query->structure,
|
|
GST_QUARK (BUSY)));
|
|
if (percent)
|
|
*percent = g_value_get_int (gst_structure_id_get_value (query->structure,
|
|
GST_QUARK (BUFFER_PERCENT)));
|
|
}
|
|
|
|
/**
|
|
* gst_query_set_buffering_stats:
|
|
* @query: A valid #GstQuery of type GST_QUERY_BUFFERING.
|
|
* @mode: a buffering mode
|
|
* @avg_in: the average input rate
|
|
* @avg_out: the average output rate
|
|
* @buffering_left: amount of buffering time left
|
|
*
|
|
* Configures the buffering stats values in @query.
|
|
*
|
|
* Since: 0.10.20
|
|
*/
|
|
void
|
|
gst_query_set_buffering_stats (GstQuery * query, GstBufferingMode mode,
|
|
gint avg_in, gint avg_out, gint64 buffering_left)
|
|
{
|
|
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_BUFFERING);
|
|
|
|
gst_structure_id_set (query->structure,
|
|
GST_QUARK (BUFFERING_MODE), GST_TYPE_BUFFERING_MODE, mode,
|
|
GST_QUARK (AVG_IN_RATE), G_TYPE_INT, avg_in,
|
|
GST_QUARK (AVG_OUT_RATE), G_TYPE_INT, avg_out,
|
|
GST_QUARK (BUFFERING_LEFT), G_TYPE_INT64, buffering_left, NULL);
|
|
}
|
|
|
|
/**
|
|
* gst_query_parse_buffering_stats:
|
|
* @query: A valid #GstQuery of type GST_QUERY_BUFFERING.
|
|
* @mode: a buffering mode
|
|
* @avg_in: the average input rate
|
|
* @avg_out: the average output rate
|
|
* @buffering_left: amount of buffering time left
|
|
*
|
|
* Extracts the buffering stats values from @query.
|
|
*
|
|
* Since: 0.10.20
|
|
*/
|
|
void
|
|
gst_query_parse_buffering_stats (GstQuery * query,
|
|
GstBufferingMode * mode, gint * avg_in, gint * avg_out,
|
|
gint64 * buffering_left)
|
|
{
|
|
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_BUFFERING);
|
|
|
|
if (mode)
|
|
*mode = g_value_get_enum (gst_structure_id_get_value (query->structure,
|
|
GST_QUARK (BUFFERING_MODE)));
|
|
if (avg_in)
|
|
*avg_in = g_value_get_int (gst_structure_id_get_value (query->structure,
|
|
GST_QUARK (AVG_IN_RATE)));
|
|
if (avg_out)
|
|
*avg_out = g_value_get_int (gst_structure_id_get_value (query->structure,
|
|
GST_QUARK (AVG_OUT_RATE)));
|
|
if (buffering_left)
|
|
*buffering_left =
|
|
g_value_get_int64 (gst_structure_id_get_value (query->structure,
|
|
GST_QUARK (BUFFERING_LEFT)));
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_query_set_buffering_range:
|
|
* @query: a #GstQuery
|
|
* @format: the format to set for the @start and @stop values
|
|
* @start: the start to set
|
|
* @stop: the stop to set
|
|
* @estimated_total: estimated total amount of download time
|
|
*
|
|
* Set the available query result fields in @query.
|
|
*
|
|
* Since: 0.10.20
|
|
*/
|
|
void
|
|
gst_query_set_buffering_range (GstQuery * query, GstFormat format,
|
|
gint64 start, gint64 stop, gint64 estimated_total)
|
|
{
|
|
GstStructure *structure;
|
|
|
|
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_BUFFERING);
|
|
|
|
structure = gst_query_get_structure (query);
|
|
gst_structure_id_set (structure,
|
|
GST_QUARK (FORMAT), GST_TYPE_FORMAT, format,
|
|
GST_QUARK (START_VALUE), G_TYPE_INT64, start,
|
|
GST_QUARK (STOP_VALUE), G_TYPE_INT64, stop,
|
|
GST_QUARK (ESTIMATED_TOTAL), G_TYPE_INT64, estimated_total, NULL);
|
|
}
|
|
|
|
/**
|
|
* gst_query_parse_buffering_range:
|
|
* @query: a GST_QUERY_SEEKING type query #GstQuery
|
|
* @format: the format to set for the @segment_start and @segment_end values
|
|
* @start: the start to set
|
|
* @stop: the stop to set
|
|
* @estimated_total: estimated total amount of download time
|
|
*
|
|
* Parse an available query, writing the format into @format, and
|
|
* other results into the passed parameters, if the respective parameters
|
|
* are non-NULL
|
|
*
|
|
* Since: 0.10.20
|
|
*/
|
|
void
|
|
gst_query_parse_buffering_range (GstQuery * query, GstFormat * format,
|
|
gint64 * start, gint64 * stop, gint64 * estimated_total)
|
|
{
|
|
GstStructure *structure;
|
|
|
|
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_BUFFERING);
|
|
|
|
structure = gst_query_get_structure (query);
|
|
if (format)
|
|
*format = g_value_get_enum (gst_structure_id_get_value (structure,
|
|
GST_QUARK (FORMAT)));
|
|
if (start)
|
|
*start = g_value_get_int64 (gst_structure_id_get_value (structure,
|
|
GST_QUARK (START_VALUE)));
|
|
if (stop)
|
|
*stop = g_value_get_int64 (gst_structure_id_get_value (structure,
|
|
GST_QUARK (STOP_VALUE)));
|
|
if (estimated_total)
|
|
*estimated_total =
|
|
g_value_get_int64 (gst_structure_id_get_value (structure,
|
|
GST_QUARK (ESTIMATED_TOTAL)));
|
|
}
|
|
|
|
/**
|
|
* gst_query_new_uri:
|
|
*
|
|
* Constructs a new query URI query object. Use gst_query_unref()
|
|
* when done with it. An URI query is used to query the current URI
|
|
* that is used by the source or sink.
|
|
*
|
|
* Returns: A #GstQuery
|
|
*
|
|
* Since: 0.10.22
|
|
*/
|
|
GstQuery *
|
|
gst_query_new_uri (void)
|
|
{
|
|
GstQuery *query;
|
|
GstStructure *structure;
|
|
|
|
structure = gst_structure_id_new (GST_QUARK (QUERY_URI),
|
|
GST_QUARK (URI), G_TYPE_STRING, NULL, NULL);
|
|
|
|
query = gst_query_new (GST_QUERY_URI, structure);
|
|
|
|
return query;
|
|
}
|
|
|
|
/**
|
|
* gst_query_set_uri:
|
|
* @query: a #GstQuery with query type GST_QUERY_URI
|
|
* @uri: the URI to set
|
|
*
|
|
* Answer a URI query by setting the requested URI.
|
|
*
|
|
* Since: 0.10.22
|
|
*/
|
|
void
|
|
gst_query_set_uri (GstQuery * query, const gchar * uri)
|
|
{
|
|
GstStructure *structure;
|
|
|
|
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_URI);
|
|
g_return_if_fail (gst_uri_is_valid (uri));
|
|
|
|
structure = gst_query_get_structure (query);
|
|
gst_structure_id_set (structure, GST_QUARK (URI), G_TYPE_STRING, uri, NULL);
|
|
}
|
|
|
|
/**
|
|
* gst_query_parse_uri:
|
|
* @query: a #GstQuery
|
|
* @uri: the storage for the current URI (may be NULL)
|
|
*
|
|
* Parse an URI query, writing the URI into @uri as a newly
|
|
* allocated string, if the respective parameters are non-NULL.
|
|
* Free the string with g_free() after usage.
|
|
*
|
|
* Since: 0.10.22
|
|
*/
|
|
void
|
|
gst_query_parse_uri (GstQuery * query, gchar ** uri)
|
|
{
|
|
GstStructure *structure;
|
|
|
|
g_return_if_fail (GST_QUERY_TYPE (query) == GST_QUERY_URI);
|
|
|
|
structure = gst_query_get_structure (query);
|
|
if (uri)
|
|
*uri = g_value_dup_string (gst_structure_id_get_value (structure,
|
|
GST_QUARK (URI)));
|
|
}
|