gstreamer/gst/gstquery.h
Wim Taymans 8df6cd7243 Remove old query functions. Ported old code.
Original commit message from CVS:
Remove old query functions. Ported old code.
Added position/convert helper functions to gstutils.
Reordered gstpad.c code, grouping relevant things.
Remove gst_message_new(), always need to speficy a specific
message.
2005-05-09 10:53:13 +00:00

160 lines
5.6 KiB
C

/* 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.h: GstQuery API declaration
*
* 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.
*/
#ifndef __GST_QUERY_H__
#define __GST_QUERY_H__
#include <glib.h>
#include <gst/gstiterator.h>
#include <gst/gstdata.h>
#include <gst/gststructure.h>
#include <gst/gstformat.h>
G_BEGIN_DECLS
typedef enum {
GST_QUERY_NONE = 0,
GST_QUERY_TOTAL, /* deprecated, use POSITION */
GST_QUERY_POSITION,
GST_QUERY_LATENCY,
GST_QUERY_JITTER, /* not in draft-query, necessary? */
GST_QUERY_START, /* deprecated, use SEEKING */
GST_QUERY_SEGMENT_END, /* deprecated, use SEEKING */
GST_QUERY_RATE, /* not in draft-query, necessary? */
GST_QUERY_SEEKING,
GST_QUERY_CONVERT,
GST_QUERY_FORMATS
} GstQueryType;
/* rate is relative to 1000000 */
#define GST_QUERY_TYPE_RATE_DEN G_GINT64_CONSTANT (1000000)
typedef struct _GstQueryTypeDefinition GstQueryTypeDefinition;
typedef struct _GstQuery GstQuery;
struct _GstQueryTypeDefinition
{
GstQueryType value;
gchar *nick;
gchar *description;
};
#ifdef G_HAVE_ISO_VARARGS
#define GST_QUERY_TYPE_FUNCTION(type, functionname, ...) \
static const GstQueryType* \
functionname (type object) \
{ \
static const GstQueryType types[] = { \
__VA_ARGS__, \
0 \
}; \
return types; \
}
#elif defined(G_HAVE_GNUC_VARARGS)
#define GST_QUERY_TYPE_FUNCTION(type, functionname, a...) \
static const GstQueryType* \
functionname (type object) \
{ \
static const GstQueryType types[] = { \
a, \
0 \
}; \
return types; \
}
#endif
GST_EXPORT GType _gst_query_type;
#define GST_TYPE_QUERY (_gst_query_type)
#define GST_QUERY(query) ((GstQuery*)(query))
#define GST_IS_QUERY(query) (GST_DATA_TYPE(query) == GST_TYPE_QUERY)
#define GST_QUERY_TYPE(query) (((GstQuery*)(query))->type)
struct _GstQuery
{
GstData data;
/*< public > */
GstQueryType type;
GstStructure *structure;
/*< private > */
gpointer _gst_reserved[GST_PADDING];
};
void _gst_query_initialize (void);
GType gst_query_get_type (void);
/* register a new query */
GstQueryType gst_query_type_register (const gchar *nick,
const gchar *description);
GstQueryType gst_query_type_get_by_nick (const gchar *nick);
/* check if a query is in an array of querys */
gboolean gst_query_types_contains (const GstQueryType *types,
GstQueryType type);
/* query for query details */
G_CONST_RETURN GstQueryTypeDefinition*
gst_query_type_get_details (GstQueryType type);
GstIterator* gst_query_type_iterate_definitions (void);
/* refcounting */
#define gst_query_ref(msg) GST_QUERY (gst_data_ref (GST_DATA (msg)))
#define gst_query_ref_by_count(msg,c) GST_QUERY (gst_data_ref_by_count (GST_DATA (msg), (c)))
#define gst_query_unref(msg) gst_data_unref (GST_DATA (msg))
/* copy query */
#define gst_query_copy(msg) GST_QUERY (gst_data_copy (GST_DATA (msg)))
#define gst_query_copy_on_write(msg) GST_QUERY (gst_data_copy_on_write (GST_DATA (msg)))
/* position query */
GstQuery* gst_query_new_position (GstFormat format);
void gst_query_set_position (GstQuery *query, GstFormat format,
gint64 cur, gint64 end);
void gst_query_parse_position (GstQuery *query, GstFormat *format,
gint64 *cur, gint64 *end);
/* convert query */
GstQuery* gst_query_new_convert (GstFormat src_fmt, gint64 value, GstFormat dest_fmt);
void gst_query_set_convert (GstQuery *query, GstFormat src_format, gint64 src_value,
GstFormat dest_format, gint64 dest_value);
void gst_query_parse_convert (GstQuery *query, GstFormat *src_format, gint64 *src_value,
GstFormat *dest_format, gint64 *dest_value);
/* application specific query */
GstQuery * gst_query_new_application (GstQueryType type,
GstStructure *structure);
GstStructure * gst_query_get_structure (GstQuery *query);
/* hmm */
#define GST_QUERY_POSITION_GET_FORMAT(q) \
(gst_structure_get_int ((q)->structure, "format"))
G_END_DECLS
#endif /* __GST_QUERY_H__ */