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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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2797299404
Original commit message from CVS: small fixes before release
1532 lines
36 KiB
C
1532 lines
36 KiB
C
/* GStreamer
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* Copyright (C) 2003 David A. Schleef <ds@schleef.org>
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*
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* gststructure.c: lists of { GQuark, GValue } tuples
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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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <string.h>
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#include "gst_private.h"
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#include <gst/gst.h>
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#include <gobject/gvaluecollector.h>
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typedef struct _GstStructureField GstStructureField;
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struct _GstStructureField
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{
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GQuark name;
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GValue value;
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};
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#define GST_STRUCTURE_FIELD(structure, index) \
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&g_array_index((structure)->fields, GstStructureField, (index))
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static void gst_structure_set_field (GstStructure * structure,
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GstStructureField * field);
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static GstStructureField *gst_structure_get_field (const GstStructure *
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structure, const gchar * fieldname);
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static GstStructureField *gst_structure_id_get_field (const GstStructure *
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structure, GQuark field);
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static void gst_structure_transform_to_string (const GValue * src_value,
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GValue * dest_value);
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static GstStructure *gst_structure_copy_conditional (const GstStructure *
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structure);
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static gboolean gst_structure_parse_value (gchar * str, gchar ** after,
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GValue * value, GType default_type);
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static gboolean gst_structure_parse_simple_string (gchar * s, gchar ** end);
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GType
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gst_structure_get_type (void)
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{
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static GType gst_structure_type;
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if (!gst_structure_type) {
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gst_structure_type = g_boxed_type_register_static ("GstStructure",
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(GBoxedCopyFunc) gst_structure_copy_conditional,
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(GBoxedFreeFunc) gst_structure_free);
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g_value_register_transform_func (gst_structure_type, G_TYPE_STRING,
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gst_structure_transform_to_string);
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}
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return gst_structure_type;
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}
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static GstStructure *
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gst_structure_id_empty_new_with_size (GQuark quark, guint prealloc)
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{
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GstStructure *structure;
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structure = g_new0 (GstStructure, 1);
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structure->type = gst_structure_get_type ();
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structure->name = quark;
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structure->fields =
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g_array_sized_new (FALSE, TRUE, sizeof (GstStructureField), prealloc);
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return structure;
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}
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/**
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* gst_structure_id_empty_new:
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* @quark: name of new structure
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*
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* Creates a new, empty #GstStructure with the given name.
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*
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* Returns: a new, empty #GstStructure
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*/
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GstStructure *
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gst_structure_id_empty_new (GQuark quark)
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{
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g_return_val_if_fail (quark != 0, NULL);
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return gst_structure_id_empty_new_with_size (quark, 0);
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}
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/**
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* gst_structure_empty_new:
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* @name: name of new structure
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*
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* Creates a new, empty #GstStructure with the given name.
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*
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* Returns: a new, empty #GstStructure
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*/
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GstStructure *
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gst_structure_empty_new (const gchar * name)
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{
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g_return_val_if_fail (name != NULL, NULL);
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return gst_structure_id_empty_new_with_size (g_quark_from_string (name), 0);
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}
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/**
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* gst_structure_new:
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* @name: name of new structure
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* @firstfield: name of first field to set
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* @...: additional arguments
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*
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* Creates a new #GstStructure with the given name. Parses the
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* list of variable arguments and sets fields to the values listed.
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* Variable arguments should be passed as field name, field type,
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* and value. Last variable argument should be NULL.
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*
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* Returns: a new #GstStructure
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*/
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GstStructure *
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gst_structure_new (const gchar * name, const gchar * firstfield, ...)
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{
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GstStructure *structure;
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va_list varargs;
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g_return_val_if_fail (name != NULL, NULL);
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va_start (varargs, firstfield);
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structure = gst_structure_new_valist (name, firstfield, varargs);
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va_end (varargs);
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return structure;
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}
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/**
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* gst_structure_new_valist:
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* @name: name of new structure
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* @firstfield: name of first field to set
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* @varargs: variable argument list
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*
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* Creates a new #GstStructure with the given name. Structure fields
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* are set according to the varargs in a manner similar to
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* @gst_structure_new.
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*
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* Returns: a new #GstStructure
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*/
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GstStructure *
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gst_structure_new_valist (const gchar * name,
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const gchar * firstfield, va_list varargs)
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{
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GstStructure *structure;
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g_return_val_if_fail (name != NULL, NULL);
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structure = gst_structure_empty_new (name);
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gst_structure_set_valist (structure, firstfield, varargs);
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return structure;
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}
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/**
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* gst_structure_copy:
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* @structure: a #GstStructure to duplicate
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*
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* Duplicates a #GstStructure and all its fields and values.
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*
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* Returns: a new #GstStructure.
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*/
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GstStructure *
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gst_structure_copy (const GstStructure * structure)
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{
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GstStructure *new_structure;
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GstStructureField *field;
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int i;
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g_return_val_if_fail (structure != NULL, NULL);
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new_structure =
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gst_structure_id_empty_new_with_size (structure->name,
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structure->fields->len);
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for (i = 0; i < structure->fields->len; i++) {
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GstStructureField new_field = { 0 };
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field = GST_STRUCTURE_FIELD (structure, i);
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new_field.name = field->name;
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gst_value_init_and_copy (&new_field.value, &field->value);
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g_array_append_val (new_structure->fields, new_field);
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}
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return new_structure;
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}
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/**
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* gst_structure_free:
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* @structure: the #GstStructure to free
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*
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* Frees a #GstStructure and all its fields and values.
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*/
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void
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gst_structure_free (GstStructure * structure)
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{
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GstStructureField *field;
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int i;
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g_return_if_fail (structure != NULL);
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for (i = 0; i < structure->fields->len; i++) {
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field = GST_STRUCTURE_FIELD (structure, i);
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if (G_IS_VALUE (&field->value)) {
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g_value_unset (&field->value);
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}
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}
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g_array_free (structure->fields, TRUE);
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#ifdef USE_POISONING
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memset (structure, 0xff, sizeof (GstStructure));
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#endif
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g_free (structure);
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}
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/**
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* gst_structure_get_name:
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* @structure: a #GstStructure
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*
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* Accessor fuction.
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*
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* Returns: the name of the structure.
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*/
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const gchar *
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gst_structure_get_name (const GstStructure * structure)
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{
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g_return_val_if_fail (structure != NULL, NULL);
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return g_quark_to_string (structure->name);
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}
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/**
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* gst_structure_get_name:
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* @structure: a #GstStructure
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*
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* Accessor fuction.
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*
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* Returns: the quark representing the name of the structure.
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*/
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GQuark
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gst_structure_get_name_id (const GstStructure * structure)
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{
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g_return_val_if_fail (structure != NULL, 0);
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return structure->name;
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}
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/**
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* gst_structure_set_name:
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* @structure: a #GstStructure
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* @name: the new name of the structure
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*
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* Sets the name of the structure to the given name. The string
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* provided is copied before being used.
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*/
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void
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gst_structure_set_name (GstStructure * structure, const gchar * name)
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{
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g_return_if_fail (structure != NULL);
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g_return_if_fail (name != NULL);
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structure->name = g_quark_from_string (name);
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}
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/**
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* gst_structure_id_set_value:
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* @structure: a #GstStructure
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* @field: a #GQuark representing a field
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* @value: the new value of the field
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*
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* Sets the field with the given ID to the provided value. If the field
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* does not exist, it is created. If the field exists, the previous
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* value is freed.
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*/
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void
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gst_structure_id_set_value (GstStructure * structure,
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GQuark field, const GValue * value)
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{
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GstStructureField gsfield = { 0, {0,} };
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g_return_if_fail (structure != NULL);
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g_return_if_fail (G_IS_VALUE (value));
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gsfield.name = field;
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gst_value_init_and_copy (&gsfield.value, value);
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gst_structure_set_field (structure, &gsfield);
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}
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/**
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* gst_structure_set_value:
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* @structure: a #GstStructure
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* @fieldname: the name of the field to set
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* @value: the new value of the field
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*
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* Sets the field with the given name to the provided value. If the field
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* does not exist, it is created. If the field exists, the previous
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* value is freed.
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*/
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void
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gst_structure_set_value (GstStructure * structure,
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const gchar * fieldname, const GValue * value)
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{
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g_return_if_fail (structure != NULL);
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g_return_if_fail (fieldname != NULL);
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g_return_if_fail (G_IS_VALUE (value));
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gst_structure_id_set_value (structure, g_quark_from_string (fieldname),
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value);
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}
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/**
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* gst_structure_set:
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* @structure: a #GstStructure
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* @fieldname: the name of the field to set
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* @...: variable arguments
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*
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* Parses the variable arguments and sets fields accordingly.
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* Variable arguments should be in the form field name, field type
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* (as a GType), value. The last variable argument should be NULL.
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*/
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void
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gst_structure_set (GstStructure * structure, const gchar * field, ...)
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{
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va_list varargs;
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g_return_if_fail (structure != NULL);
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va_start (varargs, field);
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gst_structure_set_valist (structure, field, varargs);
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va_end (varargs);
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}
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/**
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* gst_structure_set_valist:
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* @structure: a #GstStructure
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* @fieldname: the name of the field to set
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* @varargs: variable arguments
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*
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* va_list form of #gst_structure_set.
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*/
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void
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gst_structure_set_valist (GstStructure * structure,
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const gchar * fieldname, va_list varargs)
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{
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GType type;
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int i;
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double d;
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char *s;
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g_return_if_fail (structure != NULL);
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while (fieldname) {
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GstStructureField field = { 0 };
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field.name = g_quark_from_string (fieldname);
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type = va_arg (varargs, GType);
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switch (type) {
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case G_TYPE_INT:
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i = va_arg (varargs, int);
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g_value_init (&field.value, G_TYPE_INT);
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g_value_set_int (&field.value, i);
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break;
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case G_TYPE_DOUBLE:
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d = va_arg (varargs, double);
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g_value_init (&field.value, G_TYPE_DOUBLE);
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g_value_set_double (&field.value, d);
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break;
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case G_TYPE_BOOLEAN:
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i = va_arg (varargs, int);
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g_value_init (&field.value, G_TYPE_BOOLEAN);
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g_value_set_boolean (&field.value, i);
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break;
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case G_TYPE_STRING:
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s = va_arg (varargs, char *);
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g_value_init (&field.value, G_TYPE_STRING);
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g_value_set_string (&field.value, s);
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break;
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default:
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if (type == GST_TYPE_FOURCC) {
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i = va_arg (varargs, int);
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g_value_init (&field.value, GST_TYPE_FOURCC);
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gst_value_set_fourcc (&field.value, i);
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} else if (type == GST_TYPE_INT_RANGE) {
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int min, max;
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min = va_arg (varargs, int);
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max = va_arg (varargs, int);
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g_value_init (&field.value, GST_TYPE_INT_RANGE);
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gst_value_set_int_range (&field.value, min, max);
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} else if (type == GST_TYPE_DOUBLE_RANGE) {
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double min, max;
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min = va_arg (varargs, double);
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max = va_arg (varargs, double);
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g_value_init (&field.value, GST_TYPE_DOUBLE_RANGE);
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gst_value_set_double_range (&field.value, min, max);
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} else if (type == GST_TYPE_BUFFER) {
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GstBuffer *buffer = va_arg (varargs, GstBuffer *);
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g_value_init (&field.value, GST_TYPE_BUFFER);
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g_value_set_boxed (&field.value, buffer);
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} else if (type == GST_TYPE_FRACTION) {
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gint n, d;
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n = va_arg (varargs, int);
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d = va_arg (varargs, int);
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g_value_init (&field.value, GST_TYPE_FRACTION);
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gst_value_set_fraction (&field.value, n, d);
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} else {
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g_critical ("unimplemented vararg field type %d\n", (int) type);
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return;
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}
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break;
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}
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gst_structure_set_field (structure, &field);
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fieldname = va_arg (varargs, gchar *);
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}
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}
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/**
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* gst_structure_set_field:
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* @structure: a #GstStructure
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* @field: the #GstStructureField to set
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*
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* Sets a field in the structure. If the structure currently contains
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* a field with the same name, it is replaced with the provided field.
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* Otherwise, the field is added to the structure. The field's value
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* is not deeply copied.
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*
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* This function is intended mainly for internal use. The function
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* #gst_structure_set() is recommended instead of this one.
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*/
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static void
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gst_structure_set_field (GstStructure * structure, GstStructureField * field)
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{
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GstStructureField *f;
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int i;
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for (i = 0; i < structure->fields->len; i++) {
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f = GST_STRUCTURE_FIELD (structure, i);
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if (f->name == field->name) {
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g_value_unset (&f->value);
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memcpy (f, field, sizeof (GstStructureField));
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return;
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}
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}
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g_array_append_val (structure->fields, *field);
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}
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/* FIXME: is this private ? if so remove gtk-doc
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* gst_structure_id_get_field:
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* @structure: a #GstStructure
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* @field_id: the GQuark of the field to get
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*
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* Gets the specified field from the structure. If there is no
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* field with the given ID, NULL is returned.
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*
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* Returns: the #GstStructureField with the given ID
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*/
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static GstStructureField *
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gst_structure_id_get_field (const GstStructure * structure, GQuark field_id)
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{
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GstStructureField *field;
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int i;
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g_return_val_if_fail (structure != NULL, NULL);
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for (i = 0; i < structure->fields->len; i++) {
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field = GST_STRUCTURE_FIELD (structure, i);
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if (field->name == field_id)
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return field;
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}
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return NULL;
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}
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/**
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* gst_structure_get_field:
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* @structure: a #GstStructure
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* @fieldname: the name of the field to get
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*
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* Gets the specified field from the structure. If there is no
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* field with the given ID, NULL is returned.
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*
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* Returns: the #GstStructureField with the given name
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*/
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static GstStructureField *
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gst_structure_get_field (const GstStructure * structure,
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const gchar * fieldname)
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{
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g_return_val_if_fail (structure != NULL, NULL);
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g_return_val_if_fail (fieldname != NULL, NULL);
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return gst_structure_id_get_field (structure,
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g_quark_from_string (fieldname));
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}
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/**
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* gst_structure_get_value:
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* @structure: a #GstStructure
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|
* @fieldname: the name of the field to get
|
|
*
|
|
* Accessor function.
|
|
*
|
|
* Returns: the #GValue corresponding to the field with the given name.
|
|
*/
|
|
const GValue *
|
|
gst_structure_get_value (const GstStructure * structure,
|
|
const gchar * fieldname)
|
|
{
|
|
GstStructureField *field;
|
|
|
|
g_return_val_if_fail (structure != NULL, NULL);
|
|
g_return_val_if_fail (fieldname != NULL, NULL);
|
|
|
|
field = gst_structure_get_field (structure, fieldname);
|
|
if (field == NULL)
|
|
return NULL;
|
|
|
|
return &field->value;
|
|
}
|
|
|
|
/**
|
|
* gst_structure_id_get_value:
|
|
* @structure: a #GstStructure
|
|
* @field: the #GQuark of the field to get
|
|
*
|
|
* Accessor function.
|
|
*
|
|
* Returns: the #GValue corresponding to the field with the given name
|
|
* identifier.
|
|
*/
|
|
const GValue *
|
|
gst_structure_id_get_value (const GstStructure * structure, GQuark field)
|
|
{
|
|
GstStructureField *gsfield;
|
|
|
|
g_return_val_if_fail (structure != NULL, NULL);
|
|
|
|
gsfield = gst_structure_id_get_field (structure, field);
|
|
if (gsfield == NULL)
|
|
return NULL;
|
|
|
|
return &gsfield->value;
|
|
}
|
|
|
|
/**
|
|
* gst_structure_remove_field:
|
|
* @structure: a #GstStructure
|
|
* @fieldname: the name of the field to remove
|
|
*
|
|
* Removes the field with the given name. If the field with the given
|
|
* name does not exist, the structure is unchanged.
|
|
*/
|
|
void
|
|
gst_structure_remove_field (GstStructure * structure, const gchar * fieldname)
|
|
{
|
|
GstStructureField *field;
|
|
GQuark id;
|
|
int i;
|
|
|
|
g_return_if_fail (structure != NULL);
|
|
g_return_if_fail (fieldname != NULL);
|
|
|
|
id = g_quark_from_string (fieldname);
|
|
|
|
for (i = 0; i < structure->fields->len; i++) {
|
|
field = GST_STRUCTURE_FIELD (structure, i);
|
|
|
|
if (field->name == id) {
|
|
if (G_IS_VALUE (&field->value)) {
|
|
g_value_unset (&field->value);
|
|
}
|
|
structure->fields = g_array_remove_index (structure->fields, i);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_structure_remove_fields:
|
|
* @structure: a #GstStructure
|
|
* @fieldname: the name of the field to remove
|
|
* @...: NULL-terminated list of more fieldnames to remove
|
|
*
|
|
* Removes the field with the given names. If a field does not exist, the
|
|
* argument is ignored.
|
|
*/
|
|
void
|
|
gst_structure_remove_fields (GstStructure * structure,
|
|
const gchar * fieldname, ...)
|
|
{
|
|
va_list varargs;
|
|
|
|
g_return_if_fail (structure != NULL);
|
|
g_return_if_fail (fieldname != NULL);
|
|
|
|
va_start (varargs, fieldname);
|
|
|
|
gst_structure_remove_fields_valist (structure, fieldname, varargs);
|
|
|
|
va_end (varargs);
|
|
}
|
|
|
|
/**
|
|
* gst_structure_remove_fields_valist:
|
|
* @structure: a #GstStructure
|
|
* @fieldname: the name of the field to remove
|
|
* @varargs: NULL-terminated list of more fieldnames to remove
|
|
*
|
|
* Removes the field with the given names. If a field does not exist, the
|
|
* argument is ignored.
|
|
*/
|
|
void
|
|
gst_structure_remove_fields_valist (GstStructure * structure,
|
|
const gchar * fieldname, va_list varargs)
|
|
{
|
|
gchar *field = (gchar *) fieldname;
|
|
|
|
g_return_if_fail (structure != NULL);
|
|
g_return_if_fail (fieldname != NULL);
|
|
|
|
while (field) {
|
|
gst_structure_remove_field (structure, field);
|
|
field = va_arg (varargs, char *);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_structure_remove_all_fields:
|
|
* @structure: a #GstStructure
|
|
*
|
|
* Removes all fields in a GstStructure.
|
|
*/
|
|
void
|
|
gst_structure_remove_all_fields (GstStructure * structure)
|
|
{
|
|
GstStructureField *field;
|
|
int i;
|
|
|
|
g_return_if_fail (structure != NULL);
|
|
|
|
for (i = structure->fields->len - 1; i >= 0; i--) {
|
|
field = GST_STRUCTURE_FIELD (structure, i);
|
|
|
|
if (G_IS_VALUE (&field->value)) {
|
|
g_value_unset (&field->value);
|
|
}
|
|
structure->fields = g_array_remove_index (structure->fields, i);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_structure_get_field_type:
|
|
* @structure: a #GstStructure
|
|
* @fieldname: the name of the field
|
|
*
|
|
* Finds the field with the given name, and returns the type of the
|
|
* value it contains. If the field is not found, G_TYPE_INVALID is
|
|
* returned.
|
|
*
|
|
* Returns: the #GValue of the field
|
|
*/
|
|
GType
|
|
gst_structure_get_field_type (const GstStructure * structure,
|
|
const gchar * fieldname)
|
|
{
|
|
GstStructureField *field;
|
|
|
|
g_return_val_if_fail (structure != NULL, G_TYPE_INVALID);
|
|
g_return_val_if_fail (fieldname != NULL, G_TYPE_INVALID);
|
|
|
|
field = gst_structure_get_field (structure, fieldname);
|
|
if (field == NULL)
|
|
return G_TYPE_INVALID;
|
|
|
|
return G_VALUE_TYPE (&field->value);
|
|
}
|
|
|
|
/**
|
|
* gst_structure_n_fields:
|
|
* @structure: a #GstStructure
|
|
*
|
|
* Accessor function.
|
|
*
|
|
* Returns: the number of fields in the structure
|
|
*/
|
|
gint
|
|
gst_structure_n_fields (const GstStructure * structure)
|
|
{
|
|
g_return_val_if_fail (structure != NULL, 0);
|
|
|
|
return structure->fields->len;
|
|
}
|
|
|
|
/**
|
|
* gst_structure_foreach:
|
|
* @structure: a #GstStructure
|
|
* @func: a function to call for each field
|
|
* @user_data: private data
|
|
*
|
|
* Calls the provided function once for each field in the #GstStructure.
|
|
*
|
|
* Returns: TRUE if the supplied function returns TRUE For each of the fields,
|
|
* FALSE otherwise.
|
|
*/
|
|
gboolean
|
|
gst_structure_foreach (GstStructure * structure,
|
|
GstStructureForeachFunc func, gpointer user_data)
|
|
{
|
|
int i;
|
|
GstStructureField *field;
|
|
gboolean ret;
|
|
|
|
for (i = 0; i < structure->fields->len; i++) {
|
|
field = GST_STRUCTURE_FIELD (structure, i);
|
|
|
|
ret = func (field->name, &field->value, user_data);
|
|
if (!ret)
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* gst_structure_has_field:
|
|
* @structure: a #GstStructure
|
|
* @fieldname: the name of a field
|
|
*
|
|
* Accessor function.
|
|
*
|
|
* Returns: TRUE if the structure contains a field with the given name
|
|
*/
|
|
gboolean
|
|
gst_structure_has_field (const GstStructure * structure,
|
|
const gchar * fieldname)
|
|
{
|
|
GstStructureField *field;
|
|
|
|
g_return_val_if_fail (structure != NULL, 0);
|
|
g_return_val_if_fail (fieldname != NULL, 0);
|
|
|
|
field = gst_structure_get_field (structure, fieldname);
|
|
|
|
return (field != NULL);
|
|
}
|
|
|
|
/**
|
|
* gst_structure_has_field_typed:
|
|
* @structure: a #GstStructure
|
|
* @fieldname: the name of a field
|
|
* @type: the type of a value
|
|
*
|
|
* Accessor function.
|
|
*
|
|
* Returns: TRUE if the structure contains a field with the given name and type
|
|
*/
|
|
gboolean
|
|
gst_structure_has_field_typed (const GstStructure * structure,
|
|
const gchar * fieldname, GType type)
|
|
{
|
|
GstStructureField *field;
|
|
|
|
g_return_val_if_fail (structure != NULL, 0);
|
|
g_return_val_if_fail (fieldname != NULL, 0);
|
|
|
|
field = gst_structure_get_field (structure, fieldname);
|
|
if (field == NULL)
|
|
return FALSE;
|
|
|
|
return (G_VALUE_TYPE (&field->value) == type);
|
|
}
|
|
|
|
|
|
/* utility functions */
|
|
|
|
/**
|
|
* gst_structure_get_boolean:
|
|
* @structure: a #GstStructure
|
|
* @fieldname: the name of a field
|
|
* @value: a pointer to a #gboolean to set
|
|
*
|
|
* Sets the boolean pointed to by @value corresponding to the value of the
|
|
* given field. Caller is responsible for making sure the field exists
|
|
* and has the correct type.
|
|
*
|
|
* Returns: TRUE if the value could be set correctly
|
|
*/
|
|
gboolean
|
|
gst_structure_get_boolean (const GstStructure * structure,
|
|
const gchar * fieldname, gboolean * value)
|
|
{
|
|
GstStructureField *field;
|
|
|
|
g_return_val_if_fail (structure != NULL, FALSE);
|
|
g_return_val_if_fail (fieldname != NULL, FALSE);
|
|
|
|
field = gst_structure_get_field (structure, fieldname);
|
|
|
|
if (field == NULL)
|
|
return FALSE;
|
|
if (!G_VALUE_HOLDS_BOOLEAN (&field->value))
|
|
return FALSE;
|
|
|
|
*value = g_value_get_boolean (&field->value);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* gst_structure_get_int:
|
|
* @structure: a #GstStructure
|
|
* @fieldname: the name of a field
|
|
* @value: a pointer to an int to set
|
|
*
|
|
* Sets the int pointed to by @value corresponding to the value of the
|
|
* given field. Caller is responsible for making sure the field exists
|
|
* and has the correct type.
|
|
*
|
|
* Returns: TRUE if the value could be set correctly
|
|
*/
|
|
gboolean
|
|
gst_structure_get_int (const GstStructure * structure,
|
|
const gchar * fieldname, gint * value)
|
|
{
|
|
GstStructureField *field;
|
|
|
|
g_return_val_if_fail (structure != NULL, FALSE);
|
|
g_return_val_if_fail (fieldname != NULL, FALSE);
|
|
g_return_val_if_fail (value != NULL, FALSE);
|
|
|
|
field = gst_structure_get_field (structure, fieldname);
|
|
|
|
if (field == NULL)
|
|
return FALSE;
|
|
if (!G_VALUE_HOLDS_INT (&field->value))
|
|
return FALSE;
|
|
|
|
*value = g_value_get_int (&field->value);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* gst_structure_get_fourcc:
|
|
* @structure: a #GstStructure
|
|
* @fieldname: the name of a field
|
|
* @value: a pointer to a #GstFourcc to set
|
|
*
|
|
* Sets the #GstFourcc pointed to by @value corresponding to the value of the
|
|
* given field. Caller is responsible for making sure the field exists
|
|
* and has the correct type.
|
|
*
|
|
* Returns: TRUE if the value could be set correctly
|
|
*/
|
|
gboolean
|
|
gst_structure_get_fourcc (const GstStructure * structure,
|
|
const gchar * fieldname, guint32 * value)
|
|
{
|
|
GstStructureField *field;
|
|
|
|
g_return_val_if_fail (structure != NULL, FALSE);
|
|
g_return_val_if_fail (fieldname != NULL, FALSE);
|
|
g_return_val_if_fail (value != NULL, FALSE);
|
|
|
|
field = gst_structure_get_field (structure, fieldname);
|
|
|
|
if (field == NULL)
|
|
return FALSE;
|
|
if (!GST_VALUE_HOLDS_FOURCC (&field->value))
|
|
return FALSE;
|
|
|
|
*value = gst_value_get_fourcc (&field->value);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* gst_structure_get_double:
|
|
* @structure: a #GstStructure
|
|
* @fieldname: the name of a field
|
|
* @value: a pointer to a #GstFourcc to set
|
|
*
|
|
* Sets the double pointed to by @value corresponding to the value of the
|
|
* given field. Caller is responsible for making sure the field exists
|
|
* and has the correct type.
|
|
*
|
|
* Returns: TRUE if the value could be set correctly
|
|
*/
|
|
gboolean
|
|
gst_structure_get_double (const GstStructure * structure,
|
|
const gchar * fieldname, gdouble * value)
|
|
{
|
|
GstStructureField *field;
|
|
|
|
g_return_val_if_fail (structure != NULL, FALSE);
|
|
g_return_val_if_fail (fieldname != NULL, FALSE);
|
|
g_return_val_if_fail (value != NULL, FALSE);
|
|
|
|
field = gst_structure_get_field (structure, fieldname);
|
|
|
|
if (field == NULL)
|
|
return FALSE;
|
|
if (!G_VALUE_HOLDS_DOUBLE (&field->value))
|
|
return FALSE;
|
|
|
|
*value = g_value_get_double (&field->value);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* gst_structure_get_string:
|
|
* @structure: a #GstStructure
|
|
* @fieldname: the name of a field
|
|
*
|
|
* Finds the field corresponding to @fieldname, and returns the string
|
|
* contained in the field's value. Caller is responsible for making
|
|
* sure the field exists and has the correct type.
|
|
*
|
|
* The string should not be modified, and remains valid until the next
|
|
* call to a gst_structure_*() function with the given structure.
|
|
*
|
|
* Returns: a pointer to the string
|
|
*/
|
|
const gchar *
|
|
gst_structure_get_string (const GstStructure * structure,
|
|
const gchar * fieldname)
|
|
{
|
|
GstStructureField *field;
|
|
|
|
g_return_val_if_fail (structure != NULL, NULL);
|
|
g_return_val_if_fail (fieldname != NULL, NULL);
|
|
|
|
field = gst_structure_get_field (structure, fieldname);
|
|
|
|
if (field == NULL)
|
|
return FALSE;
|
|
if (!G_VALUE_HOLDS_STRING (&field->value))
|
|
return FALSE;
|
|
|
|
return g_value_get_string (&field->value);
|
|
}
|
|
|
|
typedef struct _GstStructureAbbreviation
|
|
{
|
|
char *type_name;
|
|
GType type;
|
|
}
|
|
GstStructureAbbreviation;
|
|
|
|
static GstStructureAbbreviation gst_structure_abbrs[] = {
|
|
{"int", G_TYPE_INT},
|
|
{"i", G_TYPE_INT},
|
|
{"float", G_TYPE_FLOAT},
|
|
{"f", G_TYPE_FLOAT},
|
|
{"double", G_TYPE_DOUBLE},
|
|
{"d", G_TYPE_DOUBLE},
|
|
/* these are implemented with strcmp below */
|
|
//{ "buffer", GST_TYPE_BUFFER },
|
|
//{ "fourcc", GST_TYPE_FOURCC },
|
|
//{ "4", GST_TYPE_FOURCC },
|
|
//{ "fraction", GST_TYPE_FRACTION },
|
|
{"boolean", G_TYPE_BOOLEAN},
|
|
{"bool", G_TYPE_BOOLEAN},
|
|
{"b", G_TYPE_BOOLEAN},
|
|
{"string", G_TYPE_STRING},
|
|
{"str", G_TYPE_STRING},
|
|
{"s", G_TYPE_STRING}
|
|
};
|
|
|
|
static GType
|
|
gst_structure_from_abbr (const char *type_name)
|
|
{
|
|
int i;
|
|
|
|
g_return_val_if_fail (type_name != NULL, G_TYPE_INVALID);
|
|
|
|
for (i = 0; i < G_N_ELEMENTS (gst_structure_abbrs); i++) {
|
|
if (strcmp (type_name, gst_structure_abbrs[i].type_name) == 0) {
|
|
return gst_structure_abbrs[i].type;
|
|
}
|
|
}
|
|
|
|
/* FIXME shouldn't be a special case */
|
|
if (strcmp (type_name, "fourcc") == 0 || strcmp (type_name, "4") == 0) {
|
|
return GST_TYPE_FOURCC;
|
|
}
|
|
if (strcmp (type_name, "buffer") == 0) {
|
|
return GST_TYPE_BUFFER;
|
|
}
|
|
if (strcmp (type_name, "fraction") == 0) {
|
|
return GST_TYPE_FRACTION;
|
|
}
|
|
|
|
return g_type_from_name (type_name);
|
|
}
|
|
|
|
static const char *
|
|
gst_structure_to_abbr (GType type)
|
|
{
|
|
int i;
|
|
|
|
g_return_val_if_fail (type != G_TYPE_INVALID, NULL);
|
|
|
|
for (i = 0; i < G_N_ELEMENTS (gst_structure_abbrs); i++) {
|
|
if (type == gst_structure_abbrs[i].type) {
|
|
return gst_structure_abbrs[i].type_name;
|
|
}
|
|
}
|
|
|
|
/* FIXME shouldn't be a special case */
|
|
if (type == GST_TYPE_FOURCC) {
|
|
return "fourcc";
|
|
}
|
|
if (type == GST_TYPE_BUFFER) {
|
|
return "buffer";
|
|
}
|
|
if (type == GST_TYPE_FRACTION) {
|
|
return "fraction";
|
|
}
|
|
|
|
return g_type_name (type);
|
|
}
|
|
|
|
static GType
|
|
gst_structure_value_get_generic_type (GValue * val)
|
|
{
|
|
if (G_VALUE_TYPE (val) == GST_TYPE_LIST
|
|
|| G_VALUE_TYPE (val) == GST_TYPE_FIXED_LIST) {
|
|
GArray *array = g_value_peek_pointer (val);
|
|
|
|
if (array->len > 0) {
|
|
GValue *value = &g_array_index (array, GValue, 0);
|
|
|
|
return gst_structure_value_get_generic_type (value);
|
|
} else {
|
|
return G_TYPE_INT;
|
|
}
|
|
} else if (G_VALUE_TYPE (val) == GST_TYPE_INT_RANGE) {
|
|
return G_TYPE_INT;
|
|
} else if (G_VALUE_TYPE (val) == GST_TYPE_DOUBLE_RANGE) {
|
|
return G_TYPE_DOUBLE;
|
|
}
|
|
return G_VALUE_TYPE (val);
|
|
}
|
|
|
|
#define GST_ASCII_IS_STRING(c) (g_ascii_isalnum((c)) || ((c) == '_') || \
|
|
((c) == '-') || ((c) == '+') || ((c) == '/') || ((c) == ':') || \
|
|
((c) == '.'))
|
|
|
|
/**
|
|
* gst_structure_to_string:
|
|
* @structure: a #GstStructure
|
|
*
|
|
* Converts @structure to a human-readable representation.
|
|
*
|
|
* Returns: a pointer to string allocated by g_malloc()
|
|
*/
|
|
gchar *
|
|
gst_structure_to_string (const GstStructure * structure)
|
|
{
|
|
GstStructureField *field;
|
|
GString *s;
|
|
int i;
|
|
|
|
/* NOTE: This function is potentially called by the debug system,
|
|
* so any calls to gst_log() (and GST_DEBUG(), GST_LOG(), etc.)
|
|
* should be careful to avoid recursion. This includes any functions
|
|
* called by gst_structure_to_string. In particular, calls should
|
|
* not use the GST_PTR_FORMAT extension. */
|
|
|
|
g_return_val_if_fail (structure != NULL, NULL);
|
|
|
|
s = g_string_new ("");
|
|
/* FIXME this string may need to be escaped */
|
|
g_string_append_printf (s, "%s", g_quark_to_string (structure->name));
|
|
for (i = 0; i < structure->fields->len; i++) {
|
|
char *t;
|
|
GType type;
|
|
|
|
field = GST_STRUCTURE_FIELD (structure, i);
|
|
|
|
t = gst_value_serialize (&field->value);
|
|
type = gst_structure_value_get_generic_type (&field->value);
|
|
|
|
g_string_append_printf (s, ", %s=(%s)%s", g_quark_to_string (field->name),
|
|
gst_structure_to_abbr (type), t);
|
|
g_free (t);
|
|
}
|
|
return g_string_free (s, FALSE);
|
|
}
|
|
|
|
/*
|
|
* r will still point to the string. if end == next, the string will not be
|
|
* null-terminated. In all other cases it will be.
|
|
* end = pointer to char behind end of string, next = pointer to start of
|
|
* unread data.
|
|
* THIS FUNCTION MODIFIES THE STRING AND DETECTS INSIDE A NONTERMINATED STRING
|
|
*/
|
|
static gboolean
|
|
gst_structure_parse_string (gchar * s, gchar ** end, gchar ** next)
|
|
{
|
|
gchar *w;
|
|
|
|
if (*s == 0)
|
|
return FALSE;
|
|
|
|
if (*s != '"') {
|
|
int ret;
|
|
|
|
ret = gst_structure_parse_simple_string (s, end);
|
|
*next = *end;
|
|
|
|
return ret;
|
|
}
|
|
|
|
w = s;
|
|
s++;
|
|
while (*s != '"') {
|
|
if (*s == 0)
|
|
return FALSE;
|
|
|
|
if (*s == '\\') {
|
|
s++;
|
|
}
|
|
|
|
*w = *s;
|
|
w++;
|
|
s++;
|
|
}
|
|
s++;
|
|
|
|
*end = w;
|
|
*next = s;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static gboolean
|
|
gst_structure_parse_range (gchar * s, gchar ** after, GValue * value,
|
|
GType type)
|
|
{
|
|
GValue value1 = { 0 };
|
|
GValue value2 = { 0 };
|
|
GType range_type;
|
|
gboolean ret;
|
|
|
|
|
|
if (*s != '[')
|
|
return FALSE;
|
|
s++;
|
|
|
|
ret = gst_structure_parse_value (s, &s, &value1, type);
|
|
if (ret == FALSE)
|
|
return FALSE;
|
|
|
|
while (g_ascii_isspace (*s))
|
|
s++;
|
|
|
|
if (*s != ',')
|
|
return FALSE;
|
|
s++;
|
|
|
|
while (g_ascii_isspace (*s))
|
|
s++;
|
|
|
|
ret = gst_structure_parse_value (s, &s, &value2, type);
|
|
if (ret == FALSE)
|
|
return FALSE;
|
|
|
|
while (g_ascii_isspace (*s))
|
|
s++;
|
|
|
|
if (*s != ']')
|
|
return FALSE;
|
|
s++;
|
|
|
|
if (G_VALUE_TYPE (&value1) != G_VALUE_TYPE (&value2))
|
|
return FALSE;
|
|
|
|
if (G_VALUE_TYPE (&value1) == G_TYPE_DOUBLE) {
|
|
range_type = GST_TYPE_DOUBLE_RANGE;
|
|
} else if (G_VALUE_TYPE (&value1) == G_TYPE_INT) {
|
|
range_type = GST_TYPE_INT_RANGE;
|
|
} else {
|
|
return FALSE;
|
|
}
|
|
|
|
g_value_init (value, range_type);
|
|
if (range_type == GST_TYPE_DOUBLE_RANGE) {
|
|
gst_value_set_double_range (value, g_value_get_double (&value1),
|
|
g_value_get_double (&value2));
|
|
} else {
|
|
gst_value_set_int_range (value, g_value_get_int (&value1),
|
|
g_value_get_int (&value2));
|
|
}
|
|
|
|
*after = s;
|
|
return TRUE;
|
|
}
|
|
|
|
static gboolean
|
|
gst_structure_parse_any_list (gchar * s, gchar ** after, GValue * value,
|
|
GType type, GType list_type, char begin, char end)
|
|
{
|
|
GValue list_value = { 0 };
|
|
gboolean ret;
|
|
GArray *array;
|
|
|
|
g_value_init (value, list_type);
|
|
array = g_value_peek_pointer (value);
|
|
|
|
if (*s != begin)
|
|
return FALSE;
|
|
s++;
|
|
|
|
while (g_ascii_isspace (*s))
|
|
s++;
|
|
if (*s == end) {
|
|
s++;
|
|
*after = s;
|
|
return TRUE;
|
|
}
|
|
|
|
ret = gst_structure_parse_value (s, &s, &list_value, type);
|
|
if (ret == FALSE)
|
|
return FALSE;
|
|
|
|
g_array_append_val (array, list_value);
|
|
|
|
while (g_ascii_isspace (*s))
|
|
s++;
|
|
|
|
while (*s != end) {
|
|
if (*s != ',')
|
|
return FALSE;
|
|
s++;
|
|
|
|
while (g_ascii_isspace (*s))
|
|
s++;
|
|
|
|
memset (&list_value, 0, sizeof (list_value));
|
|
ret = gst_structure_parse_value (s, &s, &list_value, type);
|
|
if (ret == FALSE)
|
|
return FALSE;
|
|
|
|
g_array_append_val (array, list_value);
|
|
while (g_ascii_isspace (*s))
|
|
s++;
|
|
}
|
|
|
|
s++;
|
|
|
|
*after = s;
|
|
return TRUE;
|
|
}
|
|
|
|
static gboolean
|
|
gst_structure_parse_list (gchar * s, gchar ** after, GValue * value, GType type)
|
|
{
|
|
return gst_structure_parse_any_list (s, after, value, type, GST_TYPE_LIST,
|
|
'{', '}');
|
|
}
|
|
|
|
static gboolean
|
|
gst_structure_parse_fixed_list (gchar * s, gchar ** after, GValue * value,
|
|
GType type)
|
|
{
|
|
return gst_structure_parse_any_list (s, after, value, type,
|
|
GST_TYPE_FIXED_LIST, '<', '>');
|
|
}
|
|
|
|
static gboolean
|
|
gst_structure_parse_simple_string (gchar * str, gchar ** end)
|
|
{
|
|
char *s = str;
|
|
|
|
while (GST_ASCII_IS_STRING (*s)) {
|
|
s++;
|
|
}
|
|
|
|
*end = s;
|
|
|
|
return (s != str);
|
|
}
|
|
|
|
static gboolean
|
|
gst_structure_parse_field (gchar * str,
|
|
gchar ** after, GstStructureField * field)
|
|
{
|
|
gchar *name;
|
|
gchar *name_end;
|
|
gchar *s;
|
|
gchar c;
|
|
|
|
s = str;
|
|
|
|
while (g_ascii_isspace (*s))
|
|
s++;
|
|
name = s;
|
|
if (!gst_structure_parse_simple_string (s, &name_end))
|
|
return FALSE;
|
|
|
|
s = name_end;
|
|
while (g_ascii_isspace (*s))
|
|
s++;
|
|
|
|
if (*s != '=')
|
|
return FALSE;
|
|
s++;
|
|
|
|
c = *name_end;
|
|
*name_end = 0;
|
|
field->name = g_quark_from_string (name);
|
|
*name_end = c;
|
|
|
|
if (!gst_structure_parse_value (s, &s, &field->value, G_TYPE_INVALID))
|
|
return FALSE;
|
|
|
|
*after = s;
|
|
return TRUE;
|
|
}
|
|
|
|
static gboolean
|
|
gst_structure_parse_value (gchar * str,
|
|
gchar ** after, GValue * value, GType default_type)
|
|
{
|
|
gchar *type_name;
|
|
gchar *type_end;
|
|
gchar *value_s;
|
|
gchar *value_end;
|
|
gchar *s;
|
|
gchar c;
|
|
int ret = 0;
|
|
GType type = default_type;
|
|
|
|
|
|
s = str;
|
|
while (g_ascii_isspace (*s))
|
|
s++;
|
|
|
|
type_name = NULL;
|
|
if (*s == '(') {
|
|
type = G_TYPE_INVALID;
|
|
|
|
s++;
|
|
while (g_ascii_isspace (*s))
|
|
s++;
|
|
type_name = s;
|
|
if (!gst_structure_parse_simple_string (s, &type_end))
|
|
return FALSE;
|
|
s = type_end;
|
|
while (g_ascii_isspace (*s))
|
|
s++;
|
|
if (*s != ')')
|
|
return FALSE;
|
|
s++;
|
|
while (g_ascii_isspace (*s))
|
|
s++;
|
|
|
|
c = *type_end;
|
|
*type_end = 0;
|
|
type = gst_structure_from_abbr (type_name);
|
|
*type_end = c;
|
|
|
|
if (type == G_TYPE_INVALID)
|
|
return FALSE;
|
|
}
|
|
|
|
while (g_ascii_isspace (*s))
|
|
s++;
|
|
if (*s == '[') {
|
|
ret = gst_structure_parse_range (s, &s, value, type);
|
|
} else if (*s == '{') {
|
|
ret = gst_structure_parse_list (s, &s, value, type);
|
|
} else if (*s == '<') {
|
|
ret = gst_structure_parse_fixed_list (s, &s, value, type);
|
|
} else {
|
|
value_s = s;
|
|
if (!gst_structure_parse_string (s, &value_end, &s))
|
|
return FALSE;
|
|
|
|
c = *value_end;
|
|
*value_end = 0;
|
|
if (type == G_TYPE_INVALID) {
|
|
GType try_types[] = { G_TYPE_INT, G_TYPE_DOUBLE, G_TYPE_STRING };
|
|
int i;
|
|
|
|
for (i = 0; i < 3; i++) {
|
|
g_value_init (value, try_types[i]);
|
|
ret = gst_value_deserialize (value, value_s);
|
|
if (ret)
|
|
break;
|
|
g_value_unset (value);
|
|
}
|
|
} else {
|
|
g_value_init (value, type);
|
|
|
|
ret = gst_value_deserialize (value, value_s);
|
|
}
|
|
*value_end = c;
|
|
}
|
|
|
|
*after = s;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* gst_structure_from_string:
|
|
* @string: a string representation of a #GstStructure.
|
|
* @end: FIXME, deduce from code
|
|
*
|
|
* Creates a #GstStructure from a string representation.
|
|
*
|
|
* Returns: a new #GstStructure
|
|
*/
|
|
GstStructure *
|
|
gst_structure_from_string (const gchar * string, gchar ** end)
|
|
{
|
|
char *name;
|
|
char *copy;
|
|
char *w;
|
|
char *r;
|
|
char save;
|
|
GstStructure *structure = NULL;
|
|
GstStructureField field = { 0 };
|
|
|
|
g_return_val_if_fail (string != NULL, NULL);
|
|
|
|
copy = g_strdup (string);
|
|
r = copy;
|
|
|
|
name = r;
|
|
if (!gst_structure_parse_string (r, &w, &r))
|
|
goto error;
|
|
|
|
while (g_ascii_isspace (*r))
|
|
r++;
|
|
if (*r != 0 && *r != ';' && *r != ',')
|
|
goto error;
|
|
|
|
save = *w;
|
|
*w = 0;
|
|
structure = gst_structure_empty_new (name);
|
|
*w = save;
|
|
|
|
while (*r && (*r != ';')) {
|
|
if (*r != ',')
|
|
goto error;
|
|
r++;
|
|
while (*r && g_ascii_isspace (*r))
|
|
r++;
|
|
|
|
memset (&field, 0, sizeof (field));
|
|
if (!gst_structure_parse_field (r, &r, &field))
|
|
goto error;
|
|
gst_structure_set_field (structure, &field);
|
|
while (*r && g_ascii_isspace (*r))
|
|
r++;
|
|
}
|
|
|
|
if (end)
|
|
*end = (char *) string + (r - copy);
|
|
|
|
g_free (copy);
|
|
return structure;
|
|
|
|
error:
|
|
if (structure)
|
|
gst_structure_free (structure);
|
|
g_free (copy);
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
gst_structure_transform_to_string (const GValue * src_value,
|
|
GValue * dest_value)
|
|
{
|
|
g_return_if_fail (src_value != NULL);
|
|
g_return_if_fail (dest_value != NULL);
|
|
|
|
dest_value->data[0].v_pointer =
|
|
gst_structure_to_string (src_value->data[0].v_pointer);
|
|
}
|
|
|
|
static GstStructure *
|
|
gst_structure_copy_conditional (const GstStructure * structure)
|
|
{
|
|
if (structure)
|
|
return gst_structure_copy (structure);
|
|
return NULL;
|
|
}
|