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gstquery.h
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/* 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/gstminiobject.h>
#include <gst/gststructure.h>
#include <gst/gstformat.h>
G_BEGIN_DECLS
/**
* GstQueryType:
* @GST_QUERY_NONE: invalid query type
* @GST_QUERY_POSITION: current position in stream
* @GST_QUERY_DURATION: total duration of the stream
* @GST_QUERY_LATENCY: latency of stream
* @GST_QUERY_JITTER: current jitter of stream
* @GST_QUERY_RATE: current rate of the stream
* @GST_QUERY_SEEKING: seeking capabilities
* @GST_QUERY_SEGMENT: segment start/stop positions
* @GST_QUERY_CONVERT: convert values
* @GST_QUERY_FORMATS: query supported formats for convert
*
* Standard predefined Query types
*/
typedef enum {
GST_QUERY_NONE = 0,
GST_QUERY_POSITION,
GST_QUERY_DURATION,
GST_QUERY_LATENCY,
GST_QUERY_JITTER, /* not in draft-query, necessary? */
GST_QUERY_RATE,
GST_QUERY_SEEKING,
GST_QUERY_SEGMENT,
GST_QUERY_CONVERT,
GST_QUERY_FORMATS
} GstQueryType;
/**
* GST_QUERY_TYPE_RATE_DEN:
*
* Rates are relative to this value
*/
#define GST_QUERY_TYPE_RATE_DEN G_GINT64_CONSTANT (1000000)
typedef struct _GstQueryTypeDefinition GstQueryTypeDefinition;
typedef struct _GstQuery GstQuery;
typedef struct _GstQueryClass GstQueryClass;
/**
* GstQueryTypeDefinition:
* @value: the unique id of the Query type
* @nick: a short nick
* @description: a longer description of the query type
*
* A Query Type definition
*/
struct _GstQueryTypeDefinition
{
GstQueryType value;
gchar *nick;
gchar *description;
};
#define GST_TYPE_QUERY (gst_query_get_type())
#define GST_IS_QUERY(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_QUERY))
#define GST_IS_QUERY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_QUERY))
#define GST_QUERY_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_QUERY, GstQueryClass))
#define GST_QUERY(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_QUERY, GstQuery))
#define GST_QUERY_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_QUERY, GstQueryClass))
#define GST_QUERY_TYPE(query) (((GstQuery*)(query))->type)
struct _GstQuery
{
GstMiniObject mini_object;
/*< public > */
GstQueryType type;
GstStructure *structure;
/*< private > */
gpointer _gst_reserved[GST_PADDING];
};
struct _GstQueryClass {
GstMiniObjectClass mini_object_class;
/*< 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 */
/**
* gst_query_ref:
* @q: a #GstQuery to increase the refcount of.
*
* Increases the refcount of the given query by one.
*/
#define gst_query_ref(q) GST_QUERY (gst_mini_object_ref (GST_MINI_OBJECT (q)))
/**
* gst_query_unref:
* @q: a #GstQuery to decrease the refcount of.
*
* Decreases the refcount of the query. If the refcount reaches 0, the query
* will be freed.
*/
#define gst_query_unref(q) gst_mini_object_unref (GST_MINI_OBJECT (q))
/* copy query */
/**
* gst_query_copy:
* @q: a #GstQuery to copy.
*
* Copies the given query using the copy function of the parent #GstData
* structure.
*/
#define gst_query_copy(q) GST_QUERY (gst_mini_object_copy (GST_MINI_OBJECT (q)))
/**
* gst_query_make_writable:
* @q: a #GstQuery to make writable
*
* Makes a writable query from the given query.
*/
#define gst_query_make_writable(q) GST_QUERY (gst_mini_object_make_writable (GST_MINI_OBJECT (q)))
/* position query */
GstQuery* gst_query_new_position (GstFormat format);
void gst_query_set_position (GstQuery *query, GstFormat format, gint64 cur);
void gst_query_parse_position (GstQuery *query, GstFormat *format, gint64 *cur);
/* duration query */
GstQuery* gst_query_new_duration (GstFormat format);
void gst_query_set_duration (GstQuery *query, GstFormat format, gint64 duration);
void gst_query_parse_duration (GstQuery *query, GstFormat *format, gint64 *duration);
/* convert query */
GstQuery* gst_query_new_convert (GstFormat src_format, gint64 value, GstFormat dest_format);
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);
/* segment query */
GstQuery* gst_query_new_segment (GstFormat format);
void gst_query_set_segment (GstQuery *query, gdouble rate, GstFormat format,
gint64 start_value, gint64 stop_value);
void gst_query_parse_segment (GstQuery *query, gdouble *rate, GstFormat *format,
gint64 *start_value, gint64 *stop_value);
/* application specific query */
GstQuery * gst_query_new_application (GstQueryType type,
GstStructure *structure);
GstStructure * gst_query_get_structure (GstQuery *query);
/* moved from old gstqueryutils.h */
void gst_query_set_seeking (GstQuery *query, GstFormat format,
gboolean seekable,
gint64 segment_start,
gint64 segment_end);
void gst_query_set_formats (GstQuery *query, gint n_formats, ...);
G_END_DECLS
#endif /* __GST_QUERY_H__ */