78a44afc22
There are cases (in the gst-python bindings for example) where it is interesting to know that the structure is not writable Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/9027>
594 lines
31 KiB
C
594 lines
31 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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, 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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#include <gst/gstidstr.h>
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G_BEGIN_DECLS
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GST_API GType _gst_structure_type;
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typedef struct _GstStructure GstStructure;
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/**
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* GST_SERIALIZE_FLAG_STRICT:
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*
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* Serialization fails if a value cannot be serialized instead of using
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* placeholder "NULL" value (e.g. pointers, objects).
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*
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* Since: 1.24
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*/
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/**
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* GstSerializeFlags:
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* @GST_SERIALIZE_FLAG_NONE: No special flags specified.
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* @GST_SERIALIZE_FLAG_BACKWARD_COMPAT: Serialize using the old format for
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* nested structures.
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* @GST_SERIALIZE_FLAG_STRICT: Serialization fails if a value cannot be
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* serialized instead of using placeholder "NULL" value (e.g. pointers,
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* objects). (Since 1.24)
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*
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* Since: 1.20
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*/
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typedef enum
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{
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GST_SERIALIZE_FLAG_NONE = 0,
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GST_SERIALIZE_FLAG_BACKWARD_COMPAT = (1 << 0),
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GST_SERIALIZE_FLAG_STRICT = (1 << 1),
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} GstSerializeFlags;
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#define GST_TYPE_STRUCTURE (_gst_structure_type)
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#define GST_IS_STRUCTURE(object) ((object) && (GST_STRUCTURE(object)->type == GST_TYPE_STRUCTURE))
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#define GST_STRUCTURE_CAST(object) ((GstStructure *)(object))
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#define GST_STRUCTURE(object) (GST_STRUCTURE_CAST(object))
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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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* GstStructureFilterMapFunc:
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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_filter_and_map_in_place().
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* The function may modify @value, and the value will be removed from
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* the structure if %FALSE is returned.
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*
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* Returns: %TRUE if the field should be preserved, %FALSE if it
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* should be removed.
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*/
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typedef gboolean (*GstStructureFilterMapFunc) (GQuark field_id,
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GValue * value,
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gpointer user_data);
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/**
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* GstStructureForeachIdStrFunc:
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* @fieldname: the #GstIdStr 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_id_str(). The
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* function may 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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* Since: 1.26
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*/
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typedef gboolean (*GstStructureForeachIdStrFunc) (const GstIdStr * fieldname,
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const GValue * value,
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gpointer user_data);
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/**
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* GstStructureMapIdStrFunc:
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* @fieldname: the #GstIdStr 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_id_str(). The
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* function 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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* Since: 1.26
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*/
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typedef gboolean (*GstStructureMapIdStrFunc) (const GstIdStr * fieldname,
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GValue * value,
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gpointer user_data);
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/**
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* GstStructureFilterMapIdStrFunc:
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* @fieldname: the #GstIdStr 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_filter_and_map_in_place_id_str().
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* The function may modify @value, and the value will be removed from the
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* structure if %FALSE is returned.
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*
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* Returns: %TRUE if the field should be preserved, %FALSE if it
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* should be removed.
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*
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* Since: 1.26
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*/
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typedef gboolean (*GstStructureFilterMapIdStrFunc) (const GstIdStr * fieldname,
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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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};
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GST_API
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GType gst_structure_get_type (void);
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GST_API
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GstStructure * gst_structure_new_empty (const gchar * name) G_GNUC_MALLOC;
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GST_API
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GstStructure * gst_structure_new_static_str_empty (const gchar * name) G_GNUC_MALLOC;
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GST_DEPRECATED_FOR(gst_structure_new_id_str_empty)
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GstStructure * gst_structure_new_id_empty (GQuark quark) G_GNUC_MALLOC;
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GST_API
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GstStructure * gst_structure_new_id_str_empty (const GstIdStr *name) G_GNUC_MALLOC;
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GST_API
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GstStructure * gst_structure_new (const gchar * name,
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const gchar * firstfield,
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...) G_GNUC_NULL_TERMINATED G_GNUC_MALLOC;
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GST_API
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GstStructure * gst_structure_new_static_str (const gchar * name,
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const gchar * firstfield,
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...) G_GNUC_NULL_TERMINATED G_GNUC_MALLOC;
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GST_API
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GstStructure * gst_structure_new_id_str_valist (const GstIdStr * name,
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const GstIdStr * firstfield,
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va_list varargs) G_GNUC_MALLOC;
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GST_API
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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) G_GNUC_MALLOC;
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GST_API
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GstStructure * gst_structure_new_static_str_valist(const gchar * name,
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const gchar * firstfield,
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va_list varargs) G_GNUC_MALLOC;
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GST_DEPRECATED_FOR(gst_structure_new_id_str)
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GstStructure * gst_structure_new_id (GQuark name_quark,
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GQuark field_quark,
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...) G_GNUC_MALLOC;
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GST_API
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GstStructure * gst_structure_new_id_str (const GstIdStr *name,
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const GstIdStr *fieldname,
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...) G_GNUC_NULL_TERMINATED G_GNUC_MALLOC;
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GST_API
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GstStructure * gst_structure_new_from_string (const gchar * string);
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GST_API
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GstStructure * gst_structure_copy (const GstStructure * structure) G_GNUC_MALLOC;
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GST_API
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gboolean gst_structure_set_parent_refcount (GstStructure * structure,
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gint * refcount);
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GST_API
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void gst_structure_free (GstStructure * structure);
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GST_API
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void gst_clear_structure (GstStructure **structure_ptr);
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#define gst_clear_structure(structure_ptr) g_clear_pointer ((structure_ptr), gst_structure_free)
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GST_API
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gboolean gst_structure_take (GstStructure ** oldstr_ptr,
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GstStructure * newstr);
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GST_API
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const gchar * gst_structure_get_name (const GstStructure * structure);
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GST_DEPRECATED_FOR(gst_structure_get_name_id_str)
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GQuark gst_structure_get_name_id (const GstStructure * structure);
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GST_API
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const GstIdStr * gst_structure_get_name_id_str (const GstStructure * structure);
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GST_API
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gboolean gst_structure_has_name (const GstStructure * structure,
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const gchar * name);
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GST_API
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void gst_structure_set_name_id_str (GstStructure * structure,
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const GstIdStr * name);
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GST_API
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void gst_structure_set_name (GstStructure * structure,
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const gchar * name);
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GST_API
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void gst_structure_set_name_static_str (GstStructure * structure,
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const gchar * name);
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GST_DEPRECATED_FOR(gst_structure_id_str_set_value)
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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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GST_API
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void gst_structure_id_str_set_value (GstStructure * structure,
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const GstIdStr * fieldname,
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const GValue * value);
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GST_API
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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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GST_API
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void gst_structure_set_value_static_str (GstStructure * structure,
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const gchar * fieldname,
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const GValue * value);
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GST_API
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void gst_structure_set_array (GstStructure * structure,
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const gchar * fieldname,
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const GValueArray * array);
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GST_API
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void gst_structure_set_list (GstStructure * structure,
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const gchar * fieldname,
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const GValueArray * array);
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GST_DEPRECATED_FOR(gst_structure_id_str_take_value)
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void gst_structure_id_take_value (GstStructure * structure,
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GQuark field,
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GValue * value);
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GST_API
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void gst_structure_id_str_take_value (GstStructure * structure,
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const GstIdStr * fieldname,
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GValue * value);
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GST_API
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void gst_structure_take_value (GstStructure * structure,
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const gchar * fieldname,
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GValue * value);
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GST_API
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void gst_structure_take_value_static_str(GstStructure * structure,
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const gchar * fieldname,
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GValue * value);
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GST_API
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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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GST_API
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void gst_structure_set_static_str (GstStructure * structure,
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const gchar * fieldname,
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...) G_GNUC_NULL_TERMINATED;
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GST_API
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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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GST_API
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void gst_structure_set_static_str_valist(GstStructure * structure,
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const gchar * fieldname,
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va_list varargs);
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GST_DEPRECATED_FOR(gst_structure_id_str_set)
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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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GST_API
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void gst_structure_id_str_set (GstStructure * structure,
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const GstIdStr * fieldname,
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...) G_GNUC_NULL_TERMINATED;
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GST_DEPRECATED_FOR(gst_structure_id_str_set_valist)
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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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GST_API
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void gst_structure_id_str_set_valist (GstStructure * structure,
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const GstIdStr * fieldname,
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va_list varargs);
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GST_API
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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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GST_API
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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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GST_API
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gboolean gst_structure_id_str_get_valist (const GstStructure * structure,
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const GstIdStr * first_fieldname,
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va_list args);
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GST_API
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gboolean gst_structure_id_str_get (const GstStructure * structure,
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const GstIdStr * first_fieldname,
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...) G_GNUC_NULL_TERMINATED;
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GST_DEPRECATED_FOR(gst_structure_id_str_get_valist)
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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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GST_DEPRECATED_FOR(gst_structure_id_str_get)
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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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GST_DEPRECATED_FOR(gst_structure_id_str_get_value)
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const GValue * gst_structure_id_get_value (const GstStructure * structure,
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GQuark field);
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GST_API
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const GValue * gst_structure_id_str_get_value (const GstStructure * structure,
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const GstIdStr * fieldname);
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GST_API
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const GValue * gst_structure_get_value (const GstStructure * structure,
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const gchar * fieldname);
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GST_API
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void gst_structure_remove_field (GstStructure * structure,
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const gchar * fieldname);
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GST_API
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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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GST_API
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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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GST_API
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void gst_structure_id_str_remove_field (GstStructure * structure,
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const GstIdStr * fieldname);
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GST_API
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void gst_structure_id_str_remove_fields (GstStructure * structure,
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const GstIdStr * fieldname,
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...) G_GNUC_NULL_TERMINATED;
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GST_API
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void gst_structure_id_str_remove_fields_valist(GstStructure * structure,
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const GstIdStr * fieldname,
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va_list varargs);
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GST_API
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void gst_structure_remove_all_fields (GstStructure * structure);
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GST_API
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GType gst_structure_get_field_type (const GstStructure * structure,
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const gchar * fieldname);
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GST_API
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GType gst_structure_id_str_get_field_type(const GstStructure * structure,
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const GstIdStr * fieldname);
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GST_DEPRECATED_FOR(gst_structure_foreach_id_str)
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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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GST_DEPRECATED_FOR(gst_structure_map_in_place_id_str)
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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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GST_DEPRECATED_FOR(gst_structure_filter_and_map_in_place_id_str)
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void gst_structure_filter_and_map_in_place (GstStructure * structure,
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GstStructureFilterMapFunc func,
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gpointer user_data);
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GST_API
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gboolean gst_structure_foreach_id_str (const GstStructure * structure,
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GstStructureForeachIdStrFunc func,
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gpointer user_data);
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GST_API
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gboolean gst_structure_map_in_place_id_str (GstStructure * structure,
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GstStructureMapIdStrFunc func,
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gpointer user_data);
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GST_API
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void gst_structure_filter_and_map_in_place_id_str (GstStructure * structure,
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GstStructureFilterMapIdStrFunc func,
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gpointer user_data);
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GST_API
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gint gst_structure_n_fields (const GstStructure * structure);
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GST_API
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const gchar * gst_structure_nth_field_name (const GstStructure * structure,
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guint index);
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GST_API
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const GstIdStr * gst_structure_id_str_nth_field_name(const GstStructure * structure,
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guint index);
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GST_DEPRECATED_FOR(gst_structure_id_str_has_field)
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gboolean gst_structure_id_has_field (const GstStructure * structure,
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GQuark field);
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GST_DEPRECATED_FOR(gst_structure_id_str_has_field_typed)
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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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GST_API
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gboolean gst_structure_has_field (const GstStructure * structure,
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const gchar * fieldname);
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GST_API
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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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GST_API
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gboolean gst_structure_id_str_has_field (const GstStructure * structure,
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const GstIdStr * fieldname);
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GST_API
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gboolean gst_structure_id_str_has_field_typed(const GstStructure * structure,
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const GstIdStr * fieldname,
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GType type);
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/* utility functions */
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GST_API
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gboolean gst_structure_get_boolean (const GstStructure * structure,
|
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const gchar * fieldname,
|
|
gboolean * value);
|
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GST_API
|
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gboolean gst_structure_get_int (const GstStructure * structure,
|
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const gchar * fieldname,
|
|
gint * value);
|
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GST_API
|
|
gboolean gst_structure_get_uint (const GstStructure * structure,
|
|
const gchar * fieldname,
|
|
guint * value);
|
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GST_API
|
|
gboolean gst_structure_get_int64 (const GstStructure * structure,
|
|
const gchar * fieldname,
|
|
gint64 * value);
|
|
GST_API
|
|
gboolean gst_structure_get_uint64 (const GstStructure * structure,
|
|
const gchar * fieldname,
|
|
guint64 * value);
|
|
GST_API
|
|
gboolean gst_structure_get_double (const GstStructure * structure,
|
|
const gchar * fieldname,
|
|
gdouble * value);
|
|
GST_API
|
|
gboolean gst_structure_get_date (const GstStructure * structure,
|
|
const gchar * fieldname,
|
|
GDate ** value);
|
|
GST_API
|
|
gboolean gst_structure_get_date_time (const GstStructure * structure,
|
|
const gchar * fieldname,
|
|
GstDateTime ** value);
|
|
GST_API
|
|
gboolean gst_structure_get_clock_time (const GstStructure * structure,
|
|
const gchar * fieldname,
|
|
GstClockTime * value);
|
|
GST_API
|
|
const gchar * gst_structure_get_string (const GstStructure * structure,
|
|
const gchar * fieldname);
|
|
GST_API
|
|
gboolean gst_structure_get_enum (const GstStructure * structure,
|
|
const gchar * fieldname,
|
|
GType enumtype,
|
|
gint * value);
|
|
GST_API
|
|
gboolean gst_structure_get_fraction (const GstStructure * structure,
|
|
const gchar * fieldname,
|
|
gint * value_numerator,
|
|
gint * value_denominator);
|
|
GST_API
|
|
gboolean gst_structure_get_flagset (const GstStructure * structure,
|
|
const gchar * fieldname,
|
|
guint * value_flags,
|
|
guint * value_mask);
|
|
GST_API
|
|
gboolean gst_structure_get_array (GstStructure * structure,
|
|
const gchar * fieldname,
|
|
GValueArray ** array);
|
|
GST_API
|
|
gboolean gst_structure_get_list (GstStructure * structure,
|
|
const gchar * fieldname,
|
|
GValueArray ** array);
|
|
|
|
GST_API
|
|
gboolean gst_structure_get_flags (const GstStructure * structure,
|
|
const gchar * fieldname,
|
|
GType flags_type,
|
|
guint * value);
|
|
|
|
GST_API
|
|
gchar * gst_structure_to_string (const GstStructure * structure) G_GNUC_MALLOC;
|
|
GST_DEPRECATED_FOR(gst_structure_serialize_full)
|
|
gchar * gst_structure_serialize (const GstStructure * structure,
|
|
GstSerializeFlags flags) G_GNUC_MALLOC;
|
|
GST_API
|
|
gchar * gst_structure_serialize_full (const GstStructure * structure,
|
|
GstSerializeFlags flags) G_GNUC_MALLOC;
|
|
|
|
GST_API
|
|
GstStructure * gst_structure_from_string (const gchar * string,
|
|
gchar ** end) G_GNUC_MALLOC;
|
|
GST_API
|
|
gboolean gst_structure_fixate_field_nearest_int (GstStructure * structure,
|
|
const char * field_name,
|
|
int target);
|
|
GST_API
|
|
gboolean gst_structure_fixate_field_nearest_double (GstStructure * structure,
|
|
const char * field_name,
|
|
double target);
|
|
GST_API
|
|
gboolean gst_structure_fixate_field_boolean (GstStructure * structure,
|
|
const char * field_name,
|
|
gboolean target);
|
|
GST_API
|
|
gboolean gst_structure_fixate_field_string (GstStructure * structure,
|
|
const char * field_name,
|
|
const gchar * target);
|
|
GST_API
|
|
gboolean gst_structure_fixate_field_nearest_fraction (GstStructure * structure,
|
|
const char * field_name,
|
|
const gint target_numerator,
|
|
const gint target_denominator);
|
|
GST_API
|
|
gboolean gst_structure_fixate_field (GstStructure * structure,
|
|
const char * field_name);
|
|
GST_API
|
|
void gst_structure_fixate (GstStructure * structure);
|
|
|
|
GST_API
|
|
gboolean gst_structure_is_equal (const GstStructure * structure1,
|
|
const GstStructure * structure2);
|
|
GST_API
|
|
gboolean gst_structure_is_subset (const GstStructure * subset,
|
|
const GstStructure * superset);
|
|
GST_API
|
|
gboolean gst_structure_can_intersect (const GstStructure * struct1,
|
|
const GstStructure * struct2);
|
|
GST_API
|
|
GstStructure * gst_structure_intersect (const GstStructure * struct1,
|
|
const GstStructure * struct2) G_GNUC_MALLOC;
|
|
|
|
GST_API
|
|
gboolean gst_structure_is_writable (const GstStructure * structure);
|
|
|
|
G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstStructure, gst_structure_free)
|
|
|
|
G_END_DECLS
|
|
|
|
#endif
|
|
|