2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2000 Wim Taymans <wim.taymans@chello.be>
4 * 2005 Wim Taymans <wim@fluendo.com>
6 * gstquery.h: GstQuery API declaration
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, USA.
25 #ifndef __GST_QUERY_H__
26 #define __GST_QUERY_H__
30 #include <gst/gstiterator.h>
31 #include <gst/gstminiobject.h>
32 #include <gst/gststructure.h>
33 #include <gst/gstformat.h>
39 GST_QUERY_POSITION, /* get current/end position */
40 GST_QUERY_LATENCY, /* get current latency */
41 GST_QUERY_JITTER, /* not in draft-query, necessary? */
42 GST_QUERY_RATE, /* get current playback rate */
43 GST_QUERY_SEEKING, /* get seeking start/stop positions */
44 GST_QUERY_CONVERT, /* convert values */
45 GST_QUERY_FORMATS /* query supported formats for convert */
48 /* rate is relative to 1000000 */
49 #define GST_QUERY_TYPE_RATE_DEN G_GINT64_CONSTANT (1000000)
51 typedef struct _GstQueryTypeDefinition GstQueryTypeDefinition;
52 typedef struct _GstQuery GstQuery;
53 typedef struct _GstQueryClass GstQueryClass;
55 struct _GstQueryTypeDefinition
62 #ifdef G_HAVE_ISO_VARARGS
63 #define GST_QUERY_TYPE_FUNCTION(type, functionname, ...) \
64 static const GstQueryType* \
65 functionname (type object) \
67 static const GstQueryType types[] = { \
73 #elif defined(G_HAVE_GNUC_VARARGS)
74 #define GST_QUERY_TYPE_FUNCTION(type, functionname, a...) \
75 static const GstQueryType* \
76 functionname (type object) \
78 static const GstQueryType types[] = { \
86 #define GST_TYPE_QUERY (gst_query_get_type())
87 #define GST_IS_QUERY(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_QUERY))
88 #define GST_IS_QUERY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_QUERY))
89 #define GST_QUERY_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_QUERY, GstQueryClass))
90 #define GST_QUERY(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_QUERY, GstQuery))
91 #define GST_QUERY_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_QUERY, GstQueryClass))
93 #define GST_QUERY_TYPE(query) (((GstQuery*)(query))->type)
97 GstMiniObject mini_object;
102 GstStructure *structure;
105 gpointer _gst_reserved[GST_PADDING];
108 struct _GstQueryClass {
109 GstMiniObjectClass mini_object_class;
112 gpointer _gst_reserved[GST_PADDING];
115 void _gst_query_initialize (void);
116 GType gst_query_get_type (void);
118 /* register a new query */
119 GstQueryType gst_query_type_register (const gchar *nick,
120 const gchar *description);
121 GstQueryType gst_query_type_get_by_nick (const gchar *nick);
123 /* check if a query is in an array of querys */
124 gboolean gst_query_types_contains (const GstQueryType *types,
127 /* query for query details */
128 G_CONST_RETURN GstQueryTypeDefinition*
129 gst_query_type_get_details (GstQueryType type);
130 GstIterator* gst_query_type_iterate_definitions (void);
133 #define gst_query_ref(msg) GST_QUERY (gst_mini_object_ref (GST_MINI_OBJECT (msg)))
134 #define gst_query_unref(msg) gst_mini_object_unref (GST_MINI_OBJECT (msg))
136 #define gst_query_copy(msg) GST_QUERY (gst_mini_object_copy (GST_MINI_OBJECT (msg)))
137 #define gst_query_make_writable(msg) GST_QUERY (gst_mini_object_make_writable (GST_MINI_OBJECT (msg)))
140 GstQuery* gst_query_new_position (GstFormat format);
141 void gst_query_set_position (GstQuery *query, GstFormat format,
142 gint64 cur, gint64 end);
143 void gst_query_parse_position (GstQuery *query, GstFormat *format,
144 gint64 *cur, gint64 *end);
146 GstQuery* gst_query_new_convert (GstFormat src_fmt, gint64 value, GstFormat dest_fmt);
147 void gst_query_set_convert (GstQuery *query, GstFormat src_format, gint64 src_value,
148 GstFormat dest_format, gint64 dest_value);
149 void gst_query_parse_convert (GstQuery *query, GstFormat *src_format, gint64 *src_value,
150 GstFormat *dest_format, gint64 *dest_value);
152 /* application specific query */
153 GstQuery * gst_query_new_application (GstQueryType type,
154 GstStructure *structure);
157 GstStructure * gst_query_get_structure (GstQuery *query);
161 #endif /* __GST_QUERY_H__ */