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248 lines
12 KiB
C
248 lines
12 KiB
C
/* GStreamer
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* Copyright (C) 2003 David A. Schleef <ds@schleef.org>
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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_STRUCTURE_H__
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#define __GST_STRUCTURE_H__
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#include <gst/gstconfig.h>
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#include <glib-object.h>
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#include <gst/gstclock.h>
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#include <gst/gstdatetime.h>
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#include <gst/glib-compat.h>
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G_BEGIN_DECLS
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#define GST_TYPE_STRUCTURE (gst_structure_get_type ())
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#define GST_STRUCTURE(object) ((GstStructure *)(object))
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#define GST_IS_STRUCTURE(object) ((object) && (GST_STRUCTURE(object)->type == GST_TYPE_STRUCTURE))
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typedef struct _GstStructure GstStructure;
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/**
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* GstStructureForeachFunc:
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* @field_id: the #GQuark of the field name
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* @value: the #GValue of the field
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* @user_data: user data
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*
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* A function that will be called in gst_structure_foreach(). The function may
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* not modify @value.
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*
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* Returns: TRUE if the foreach operation should continue, FALSE if
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* the foreach operation should stop with FALSE.
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*/
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typedef gboolean (*GstStructureForeachFunc) (GQuark field_id,
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const GValue * value,
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gpointer user_data);
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/**
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* GstStructureMapFunc:
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* @field_id: the #GQuark of the field name
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* @value: the #GValue of the field
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* @user_data: user data
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*
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* A function that will be called in gst_structure_map_in_place(). The function
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* may modify @value.
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*
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* Returns: TRUE if the map operation should continue, FALSE if
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* the map operation should stop with FALSE.
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*/
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typedef gboolean (*GstStructureMapFunc) (GQuark field_id,
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GValue * value,
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gpointer user_data);
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/**
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* GstStructure:
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* @type: the GType of a structure
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*
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* The GstStructure object. Most fields are private.
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*/
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struct _GstStructure {
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GType type;
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/*< private >*/
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GQuark name;
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/* owned by parent structure, NULL if no parent */
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gint *parent_refcount;
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GArray *fields;
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gpointer _gst_reserved;
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};
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GType gst_structure_get_type (void);
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GstStructure * gst_structure_empty_new (const gchar * name);
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GstStructure * gst_structure_id_empty_new (GQuark quark);
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GstStructure * gst_structure_new (const gchar * name,
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const gchar * firstfield,
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...);
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GstStructure * gst_structure_new_valist (const gchar * name,
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const gchar * firstfield,
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va_list varargs);
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GstStructure * gst_structure_id_new (GQuark name_quark,
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GQuark field_quark,
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...);
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GstStructure * gst_structure_copy (const GstStructure *structure);
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void gst_structure_set_parent_refcount (GstStructure *structure,
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gint *refcount);
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void gst_structure_free (GstStructure *structure);
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G_CONST_RETURN gchar * gst_structure_get_name (const GstStructure *structure);
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GQuark gst_structure_get_name_id (const GstStructure *structure);
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gboolean gst_structure_has_name (const GstStructure *structure,
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const gchar *name);
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void gst_structure_set_name (GstStructure *structure,
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const gchar *name);
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void gst_structure_id_set_value (GstStructure *structure,
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GQuark field,
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const GValue *value);
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void gst_structure_set_value (GstStructure *structure,
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const gchar *fieldname,
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const GValue *value);
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void gst_structure_set (GstStructure *structure,
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const gchar *fieldname,
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...) G_GNUC_NULL_TERMINATED;
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void gst_structure_set_valist (GstStructure *structure,
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const gchar *fieldname,
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va_list varargs);
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void gst_structure_id_set (GstStructure *structure,
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GQuark fieldname,
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...) G_GNUC_NULL_TERMINATED;
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void gst_structure_id_set_valist (GstStructure *structure,
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GQuark fieldname,
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va_list varargs);
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gboolean gst_structure_get_valist (const GstStructure *structure,
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const char *first_fieldname,
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va_list args);
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gboolean gst_structure_get (const GstStructure *structure,
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const char *first_fieldname,
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...) G_GNUC_NULL_TERMINATED;
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gboolean gst_structure_id_get_valist (const GstStructure *structure,
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GQuark first_field_id,
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va_list args);
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gboolean gst_structure_id_get (const GstStructure *structure,
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GQuark first_field_id,
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...) G_GNUC_NULL_TERMINATED;
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G_CONST_RETURN GValue * gst_structure_id_get_value (const GstStructure *structure,
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GQuark field);
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G_CONST_RETURN GValue * gst_structure_get_value (const GstStructure *structure,
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const gchar *fieldname);
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void gst_structure_remove_field (GstStructure *structure,
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const gchar *fieldname);
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void gst_structure_remove_fields (GstStructure *structure,
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const gchar *fieldname,
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...) G_GNUC_NULL_TERMINATED;
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void gst_structure_remove_fields_valist (GstStructure *structure,
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const gchar *fieldname,
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va_list varargs);
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void gst_structure_remove_all_fields (GstStructure *structure);
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GType gst_structure_get_field_type (const GstStructure *structure,
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const gchar *fieldname);
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gboolean gst_structure_foreach (const GstStructure *structure,
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GstStructureForeachFunc func,
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gpointer user_data);
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gboolean gst_structure_map_in_place (GstStructure *structure,
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GstStructureMapFunc func,
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gpointer user_data);
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gint gst_structure_n_fields (const GstStructure *structure);
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const gchar * gst_structure_nth_field_name (const GstStructure *structure, guint index);
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gboolean gst_structure_id_has_field (const GstStructure *structure,
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GQuark field);
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gboolean gst_structure_id_has_field_typed (const GstStructure *structure,
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GQuark field,
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GType type);
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gboolean gst_structure_has_field (const GstStructure *structure,
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const gchar *fieldname);
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gboolean gst_structure_has_field_typed (const GstStructure *structure,
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const gchar *fieldname,
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GType type);
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/* utility functions */
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gboolean gst_structure_get_boolean (const GstStructure *structure,
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const gchar *fieldname,
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gboolean *value);
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gboolean gst_structure_get_int (const GstStructure *structure,
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const gchar *fieldname,
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gint *value);
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gboolean gst_structure_get_uint (const GstStructure *structure,
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const gchar *fieldname,
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guint *value);
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gboolean gst_structure_get_fourcc (const GstStructure *structure,
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const gchar *fieldname,
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guint32 *value);
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gboolean gst_structure_get_double (const GstStructure *structure,
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const gchar *fieldname,
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gdouble *value);
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gboolean gst_structure_get_date (const GstStructure *structure,
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const gchar *fieldname,
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GDate **value);
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gboolean gst_structure_get_date_time (const GstStructure *structure,
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const gchar *fieldname,
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GstDateTime **value);
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gboolean gst_structure_get_clock_time (const GstStructure *structure,
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const gchar *fieldname,
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GstClockTime *value);
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G_CONST_RETURN gchar * gst_structure_get_string (const GstStructure *structure,
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const gchar *fieldname);
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gboolean gst_structure_get_enum (const GstStructure *structure,
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const gchar *fieldname,
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GType enumtype,
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gint *value);
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gboolean gst_structure_get_fraction (const GstStructure *structure,
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const gchar *fieldname,
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gint *value_numerator,
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gint *value_denominator);
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gchar * gst_structure_to_string (const GstStructure *structure);
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GstStructure * gst_structure_from_string (const gchar *string,
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gchar **end);
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gboolean gst_structure_fixate_field_nearest_int (GstStructure *structure,
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const char *field_name,
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int target);
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gboolean gst_structure_fixate_field_nearest_double (GstStructure *structure,
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const char *field_name,
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double target);
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gboolean gst_structure_fixate_field_boolean (GstStructure *structure,
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const char *field_name,
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gboolean target);
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gboolean gst_structure_fixate_field_string (GstStructure *structure,
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const char *field_name,
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const gchar *target);
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gboolean gst_structure_fixate_field_nearest_fraction (GstStructure *structure,
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const char *field_name,
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const gint target_numerator,
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const gint target_denominator);
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G_END_DECLS
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#endif
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