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GstFlagSet is a new type designed for negotiating sets of boolean capabilities flags, consisting of a 32-bit flags bitfield and 32-bit mask field. The mask field indicates which of the flags bits an element needs to have as specific values, and which it doesn't care about. This allows efficient negotiation of arrays of boolean capabilities. The standard serialisation format is FLAGS:MASK, with flags and mask fields expressed in hexadecimal, however GstFlagSet has a gst_register_flagset() function, which associates a new GstFlagSet derived type with an existing GFlags gtype. When serializing a GstFlagSet with an associated set of GFlags, it also serializes a human-readable form of the flags for easier debugging. It is possible to parse a GFlags style serialisation of a flagset, without the hex portion on the front. ie, +flag1/flag2/flag3+flag4, to indicate that flag1 & flag4 must be set, and flag2/flag3 must be unset, and any other flags are don't-care. https://bugzilla.gnome.org/show_bug.cgi?id=746373
343 lines
18 KiB
C
343 lines
18 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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G_BEGIN_DECLS
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GST_EXPORT GType _gst_structure_type;
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typedef struct _GstStructure GstStructure;
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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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* 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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GType gst_structure_get_type (void);
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GstStructure * gst_structure_new_empty (const gchar * name) G_GNUC_MALLOC;
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GstStructure * gst_structure_new_id_empty (GQuark quark) G_GNUC_MALLOC;
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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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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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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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GstStructure * gst_structure_new_from_string (const gchar * string);
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GstStructure * gst_structure_copy (const GstStructure * structure) G_GNUC_MALLOC;
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gboolean 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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const 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_id_take_value (GstStructure * structure,
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GQuark field,
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GValue * value);
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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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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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const GValue * gst_structure_id_get_value (const GstStructure * structure,
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GQuark field);
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const 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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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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gint gst_structure_n_fields (const GstStructure * structure);
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const gchar * gst_structure_nth_field_name (const GstStructure * structure,
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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_int64 (const GstStructure * structure,
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const gchar * fieldname,
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gint64 * value);
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gboolean gst_structure_get_uint64 (const GstStructure * structure,
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const gchar * fieldname,
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guint64 * 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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const 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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gboolean gst_structure_get_flagset (const GstStructure * structure,
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const gchar * fieldname,
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guint * value_flags,
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guint * value_mask);
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gchar * gst_structure_to_string (const GstStructure * structure) G_GNUC_MALLOC;
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GstStructure * gst_structure_from_string (const gchar * string,
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gchar ** end) G_GNUC_MALLOC;
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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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gboolean gst_structure_fixate_field (GstStructure * structure,
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const char * field_name);
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void gst_structure_fixate (GstStructure * structure);
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gboolean gst_structure_is_equal (const GstStructure * structure1,
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const GstStructure * structure2);
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gboolean gst_structure_is_subset (const GstStructure * subset,
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const GstStructure * superset);
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gboolean gst_structure_can_intersect (const GstStructure * struct1,
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const GstStructure * struct2);
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GstStructure * gst_structure_intersect (const GstStructure * struct1,
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const GstStructure * struct2) G_GNUC_MALLOC;
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G_END_DECLS
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#endif
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