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229 lines
7.6 KiB
C
229 lines
7.6 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.h: GstQuery API declaration
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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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#ifndef __GST_QUERY_H__
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#define __GST_QUERY_H__
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#include <glib.h>
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#include <gst/gstiterator.h>
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#include <gst/gstminiobject.h>
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#include <gst/gststructure.h>
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#include <gst/gstformat.h>
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G_BEGIN_DECLS
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/**
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* GstQueryType:
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* @GST_QUERY_NONE: invalid query type
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* @GST_QUERY_POSITION: current position in stream
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* @GST_QUERY_DURATION: total duration of the stream
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* @GST_QUERY_LATENCY: latency of stream
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* @GST_QUERY_JITTER: current jitter of stream
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* @GST_QUERY_RATE: current rate of the stream
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* @GST_QUERY_SEEKING: seeking capabilities
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* @GST_QUERY_SEGMENT: segment start/stop positions
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* @GST_QUERY_CONVERT: convert values between formats
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* @GST_QUERY_FORMATS: query supported formats for convert
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*
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* Standard predefined Query types
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*/
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/* NOTE: don't forget to update the table in gstquery.c when changing
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* this enum */
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typedef enum {
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GST_QUERY_NONE = 0,
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GST_QUERY_POSITION,
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GST_QUERY_DURATION,
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GST_QUERY_LATENCY,
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GST_QUERY_JITTER, /* not in draft-query, necessary? */
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GST_QUERY_RATE,
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GST_QUERY_SEEKING,
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GST_QUERY_SEGMENT,
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GST_QUERY_CONVERT,
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GST_QUERY_FORMATS
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} GstQueryType;
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/**
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* GST_QUERY_TYPE_RATE_DEN:
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*
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* Rates are relative to this value
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*/
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#define GST_QUERY_TYPE_RATE_DEN G_GINT64_CONSTANT (1000000)
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typedef struct _GstQueryTypeDefinition GstQueryTypeDefinition;
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typedef struct _GstQuery GstQuery;
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typedef struct _GstQueryClass GstQueryClass;
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/**
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* GstQueryTypeDefinition:
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* @value: the unique id of the Query type
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* @nick: a short nick
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* @description: a longer description of the query type
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* @quark: the quark for the nick
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*
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* A Query Type definition
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*/
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struct _GstQueryTypeDefinition
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{
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GstQueryType value;
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gchar *nick;
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gchar *description;
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GQuark quark;
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};
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#define GST_TYPE_QUERY (gst_query_get_type())
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#define GST_IS_QUERY(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_QUERY))
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#define GST_IS_QUERY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_QUERY))
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#define GST_QUERY_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_QUERY, GstQueryClass))
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#define GST_QUERY(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_QUERY, GstQuery))
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#define GST_QUERY_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_QUERY, GstQueryClass))
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#define GST_QUERY_TYPE(query) (((GstQuery*)(query))->type)
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/**
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* GstQuery:
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* @mini_object: The parent #GstMiniObject type
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* @type: the #GstQueryType
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* @structure: the #GstStructure containing the query details.
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*
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* The #GstQuery structure.
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*/
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struct _GstQuery
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{
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GstMiniObject mini_object;
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/*< public > *//* with COW */
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GstQueryType type;
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GstStructure *structure;
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/*< private > */
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gpointer _gst_reserved[GST_PADDING];
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};
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struct _GstQueryClass {
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GstMiniObjectClass mini_object_class;
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/*< private > */
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gpointer _gst_reserved[GST_PADDING];
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};
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void _gst_query_initialize (void);
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const gchar* gst_query_type_get_name (GstQueryType query);
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GQuark gst_query_type_to_quark (GstQueryType query);
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GType gst_query_get_type (void);
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/* register a new query */
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GstQueryType gst_query_type_register (const gchar *nick,
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const gchar *description);
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GstQueryType gst_query_type_get_by_nick (const gchar *nick);
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/* check if a query is in an array of querys */
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gboolean gst_query_types_contains (const GstQueryType *types,
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GstQueryType type);
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/* query for query details */
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G_CONST_RETURN GstQueryTypeDefinition*
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gst_query_type_get_details (GstQueryType type);
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GstIterator* gst_query_type_iterate_definitions (void);
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/* refcounting */
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/**
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* gst_query_ref:
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* @q: a #GstQuery to increase the refcount of.
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*
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* Increases the refcount of the given query by one.
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*/
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#define gst_query_ref(q) GST_QUERY (gst_mini_object_ref (GST_MINI_OBJECT (q)))
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/**
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* gst_query_unref:
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* @q: a #GstQuery to decrease the refcount of.
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*
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* Decreases the refcount of the query. If the refcount reaches 0, the query
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* will be freed.
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*/
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#define gst_query_unref(q) gst_mini_object_unref (GST_MINI_OBJECT (q))
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/* copy query */
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/**
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* gst_query_copy:
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* @q: a #GstQuery to copy.
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*
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* Copies the given query using the copy function of the parent #GstData
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* structure.
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*/
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#define gst_query_copy(q) GST_QUERY (gst_mini_object_copy (GST_MINI_OBJECT (q)))
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/**
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* gst_query_make_writable:
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* @q: a #GstQuery to make writable
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*
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* Makes a writable query from the given query.
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*/
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#define gst_query_make_writable(q) GST_QUERY (gst_mini_object_make_writable (GST_MINI_OBJECT (q)))
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/* position query */
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GstQuery* gst_query_new_position (GstFormat format);
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void gst_query_set_position (GstQuery *query, GstFormat format, gint64 cur);
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void gst_query_parse_position (GstQuery *query, GstFormat *format, gint64 *cur);
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/* duration query */
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GstQuery* gst_query_new_duration (GstFormat format);
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void gst_query_set_duration (GstQuery *query, GstFormat format, gint64 duration);
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void gst_query_parse_duration (GstQuery *query, GstFormat *format, gint64 *duration);
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/* convert query */
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GstQuery* gst_query_new_convert (GstFormat src_format, gint64 value, GstFormat dest_format);
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void gst_query_set_convert (GstQuery *query, GstFormat src_format, gint64 src_value,
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GstFormat dest_format, gint64 dest_value);
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void gst_query_parse_convert (GstQuery *query, GstFormat *src_format, gint64 *src_value,
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GstFormat *dest_format, gint64 *dest_value);
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/* segment query */
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GstQuery* gst_query_new_segment (GstFormat format);
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void gst_query_set_segment (GstQuery *query, gdouble rate, GstFormat format,
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gint64 start_value, gint64 stop_value);
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void gst_query_parse_segment (GstQuery *query, gdouble *rate, GstFormat *format,
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gint64 *start_value, gint64 *stop_value);
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/* application specific query */
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GstQuery * gst_query_new_application (GstQueryType type,
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GstStructure *structure);
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GstStructure * gst_query_get_structure (GstQuery *query);
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/* moved from old gstqueryutils.h */
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void gst_query_set_seeking (GstQuery *query, GstFormat format,
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gboolean seekable,
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gint64 segment_start,
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gint64 segment_end);
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void gst_query_set_formats (GstQuery *query, gint n_formats, ...);
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G_END_DECLS
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#endif /* __GST_QUERY_H__ */
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