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2284 lines
58 KiB
C
2284 lines
58 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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/**
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* SECTION:gststructure
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* @short_description: Generic structure containing fields of names and values
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* @see_also: #GstCaps, #GstMessage, #GstEvent, #GstQuery
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*
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* A #GstStructure is a collection of key/value pairs. The keys are expressed
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* as GQuarks and the values can be of any GType.
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*
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* In addition to the key/value pairs, a #GstStructure also has a name. The name
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* starts with a letter and can be folled by letters, numbers and any of "/-_.:".
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*
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* #GstStructure is used by various GStreamer subsystems to store information
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* in a flexible and extensible way. A #GstStructure does not have a refcount
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* because it usually is part of a higher level object such as #GstCaps. It
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* provides a means to enforce mutability using the refcount of the parent
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* with the gst_structure_set_parent_refcount() method.
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*
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* A #GstStructure can be created with gst_structure_empty_new() or
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* gst_structure_new(), which both take a name and an optional set of
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* key/value pairs along with the types of the values.
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*
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* Field values can be changed with gst_structure_set_value() or
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* gst_structure_set().
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*
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* Field values can be retrieved with gst_structure_get_value() or the more
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* convenient gst_structure_get_*() functions.
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*
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* Fields can be removed with gst_structure_remove_field() or
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* gst_structure_remove_fields().
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*
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* Last reviewed on 2007-10-16 (0.10.15)
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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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#define IS_MUTABLE(structure) \
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(!(structure)->parent_refcount || \
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g_atomic_int_get ((structure)->parent_refcount) == 1)
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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 = 0;
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if (G_UNLIKELY (gst_structure_type == 0)) {
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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_slice_new (GstStructure);
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structure->type = gst_structure_get_type ();
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structure->name = quark;
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structure->parent_refcount = NULL;
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structure->fields =
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g_array_sized_new (FALSE, FALSE, 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 as a GQuark.
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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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#ifndef G_DISABLE_CHECKS
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static gboolean
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gst_structure_validate_name (const gchar * name)
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{
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const gchar *s;
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g_return_val_if_fail (name != NULL, FALSE);
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/* FIXME 0.11: use g_ascii_isalpha() */
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if (!g_ascii_isalnum (*name)) {
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GST_WARNING ("Invalid character '%c' at offset 0 in structure name: %s",
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*name, name);
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return FALSE;
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}
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/* FIXME 0.11: don't allow spaces */
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/* FIXME: test name string more */
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s = &name[1];
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while (*s && (g_ascii_isalnum (*s) || strchr ("/-_.:+ ", *s) != NULL))
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s++;
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if (*s != '\0') {
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GST_WARNING ("Invalid character '%c' at offset %lu in structure name: %s",
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*s, ((gulong) s - (gulong) name), name);
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return FALSE;
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}
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return TRUE;
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}
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#endif
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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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* See gst_structure_set_name() for constraints on the @name parameter.
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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 (gst_structure_validate_name (name), 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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* See gst_structure_set_name() for constraints on the @name parameter.
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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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if (structure)
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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_set_parent_refcount:
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* @structure: a #GstStructure
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* @refcount: a pointer to the parent's refcount
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*
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* Sets the parent_refcount field of #GstStructure. This field is used to
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* determine whether a structure is mutable or not. This function should only be
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* called by code implementing parent objects of #GstStructure, as described in
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* the MT Refcounting section of the design documents.
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*/
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void
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gst_structure_set_parent_refcount (GstStructure * structure, int *refcount)
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{
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g_return_if_fail (structure != NULL);
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/* if we have a parent_refcount already, we can only clear
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* if with a NULL refcount */
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if (structure->parent_refcount)
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g_return_if_fail (refcount == NULL);
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else
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g_return_if_fail (refcount != NULL);
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structure->parent_refcount = refcount;
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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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guint 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. The structure must not
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* have a parent when this function is called.
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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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guint i;
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g_return_if_fail (structure != NULL);
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g_return_if_fail (structure->parent_refcount == 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_slice_free (GstStructure, 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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* Get the name of @structure as a string.
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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_has_name:
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* @structure: a #GstStructure
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* @name: structure name to check for
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*
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* Checks if the structure has the given name
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*
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* Returns: TRUE if @name matches the name of the structure.
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*/
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gboolean
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gst_structure_has_name (const GstStructure * structure, const gchar * name)
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{
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const gchar *structure_name;
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g_return_val_if_fail (structure != NULL, FALSE);
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g_return_val_if_fail (name != NULL, FALSE);
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/* getting the string is cheap and comparing short strings is too
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* should be faster than getting the quark for name and comparing the quarks
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*/
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structure_name = g_quark_to_string (structure->name);
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return (structure_name && strcmp (structure_name, name) == 0);
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}
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/**
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* gst_structure_get_name_id:
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* @structure: a #GstStructure
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*
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* Get the name of @structure as a GQuark.
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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. It must not be empty, start with a
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* letter and can be followed by letters, numbers and any of "/-_.:".
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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 (IS_MUTABLE (structure));
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g_return_if_fail (gst_structure_validate_name (name));
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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 GQuark @field to @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 replaced and 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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g_return_if_fail (IS_MUTABLE (structure));
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if (G_VALUE_HOLDS_STRING (value)) {
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const gchar *s;
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s = g_value_get_string (value);
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if (G_UNLIKELY (s != NULL && !g_utf8_validate (s, -1, NULL))) {
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g_warning ("Trying to set string field '%s' on structure, but string is "
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"not valid UTF-8. Please file a bug.", g_quark_to_string (field));
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return;
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}
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}
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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 @field to @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 replaced and 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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g_return_if_fail (IS_MUTABLE (structure));
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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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/**
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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(s). 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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/**
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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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|
{
|
|
gchar *err = NULL;
|
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GType type;
|
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|
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g_return_if_fail (structure != NULL);
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g_return_if_fail (IS_MUTABLE (structure));
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|
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while (fieldname) {
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GstStructureField field = { 0 };
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|
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field.name = g_quark_from_string (fieldname);
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|
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type = va_arg (varargs, GType);
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|
|
if (type == G_TYPE_DATE) {
|
|
g_warning ("Don't use G_TYPE_DATE, use GST_TYPE_DATE instead\n");
|
|
type = GST_TYPE_DATE;
|
|
}
|
|
|
|
g_value_init (&field.value, type);
|
|
G_VALUE_COLLECT (&field.value, varargs, 0, &err);
|
|
if (err) {
|
|
g_critical ("%s", err);
|
|
return;
|
|
}
|
|
gst_structure_set_field (structure, &field);
|
|
|
|
fieldname = va_arg (varargs, gchar *);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* gst_structure_id_set:
|
|
* @structure: a #GstStructure
|
|
* @fieldname: the GQuark for the name of the field to set
|
|
* @...: variable arguments
|
|
*
|
|
* Identical to gst_structure_set, except that field names are
|
|
* passed using the GQuark for the field name. This allows more efficient
|
|
* setting of the structure if the caller already knows the associated
|
|
* quark values.
|
|
* The last variable argument must be NULL.
|
|
*
|
|
* Since: 0.10.10
|
|
*/
|
|
void
|
|
gst_structure_id_set (GstStructure * structure, GQuark field, ...)
|
|
{
|
|
va_list varargs;
|
|
|
|
g_return_if_fail (structure != NULL);
|
|
|
|
va_start (varargs, field);
|
|
gst_structure_id_set_valist (structure, field, varargs);
|
|
va_end (varargs);
|
|
}
|
|
|
|
/**
|
|
* gst_structure_id_set_valist:
|
|
* @structure: a #GstStructure
|
|
* @fieldname: the name of the field to set
|
|
* @varargs: variable arguments
|
|
*
|
|
* va_list form of gst_structure_id_set().
|
|
*
|
|
* Since: 0.10.10
|
|
*/
|
|
void
|
|
gst_structure_id_set_valist (GstStructure * structure,
|
|
GQuark fieldname, va_list varargs)
|
|
{
|
|
gchar *err = NULL;
|
|
GType type;
|
|
|
|
g_return_if_fail (structure != NULL);
|
|
g_return_if_fail (IS_MUTABLE (structure));
|
|
|
|
while (fieldname) {
|
|
GstStructureField field = { 0 };
|
|
|
|
field.name = fieldname;
|
|
|
|
type = va_arg (varargs, GType);
|
|
|
|
if (type == G_TYPE_DATE) {
|
|
g_warning ("Don't use G_TYPE_DATE, use GST_TYPE_DATE instead\n");
|
|
type = GST_TYPE_DATE;
|
|
}
|
|
|
|
g_value_init (&field.value, type);
|
|
G_VALUE_COLLECT (&field.value, varargs, 0, &err);
|
|
if (err) {
|
|
g_critical ("%s", err);
|
|
return;
|
|
}
|
|
gst_structure_set_field (structure, &field);
|
|
|
|
fieldname = va_arg (varargs, GQuark);
|
|
}
|
|
}
|
|
|
|
/* If the structure currently contains a field with the same name, it is
|
|
* replaced with the provided field. Otherwise, the field is added to the
|
|
* structure. The field's value is not deeply copied.
|
|
*/
|
|
static void
|
|
gst_structure_set_field (GstStructure * structure, GstStructureField * field)
|
|
{
|
|
GstStructureField *f;
|
|
guint i;
|
|
|
|
for (i = 0; i < structure->fields->len; i++) {
|
|
f = GST_STRUCTURE_FIELD (structure, i);
|
|
|
|
if (f->name == field->name) {
|
|
g_value_unset (&f->value);
|
|
memcpy (f, field, sizeof (GstStructureField));
|
|
return;
|
|
}
|
|
}
|
|
|
|
g_array_append_val (structure->fields, *field);
|
|
}
|
|
|
|
/* If there is no field with the given ID, NULL is returned.
|
|
*/
|
|
static GstStructureField *
|
|
gst_structure_id_get_field (const GstStructure * structure, GQuark field_id)
|
|
{
|
|
GstStructureField *field;
|
|
guint i;
|
|
|
|
g_return_val_if_fail (structure != NULL, NULL);
|
|
|
|
for (i = 0; i < structure->fields->len; i++) {
|
|
field = GST_STRUCTURE_FIELD (structure, i);
|
|
|
|
if (field->name == field_id)
|
|
return field;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* If there is no field with the given ID, NULL is returned.
|
|
*/
|
|
static GstStructureField *
|
|
gst_structure_get_field (const GstStructure * structure,
|
|
const gchar * fieldname)
|
|
{
|
|
g_return_val_if_fail (structure != NULL, NULL);
|
|
g_return_val_if_fail (fieldname != NULL, NULL);
|
|
|
|
return gst_structure_id_get_field (structure,
|
|
g_quark_from_string (fieldname));
|
|
}
|
|
|
|
/**
|
|
* gst_structure_get_value:
|
|
* @structure: a #GstStructure
|
|
* @fieldname: the name of the field to get
|
|
*
|
|
* Get the value of the field with name @fieldname.
|
|
*
|
|
* 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
|
|
*
|
|
* Get the value of the field with GQuark @field.
|
|
*
|
|
* 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;
|
|
guint i;
|
|
|
|
g_return_if_fail (structure != NULL);
|
|
g_return_if_fail (fieldname != NULL);
|
|
g_return_if_fail (IS_MUTABLE (structure));
|
|
|
|
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 fields 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);
|
|
/* mutability checked in remove_field */
|
|
|
|
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
|
|
*
|
|
* va_list form of gst_structure_remove_fields().
|
|
*/
|
|
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);
|
|
/* mutability checked in remove_field */
|
|
|
|
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);
|
|
g_return_if_fail (IS_MUTABLE (structure));
|
|
|
|
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
|
|
*
|
|
* Get the number of fields in the structure.
|
|
*
|
|
* 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_nth_field_name:
|
|
* @structure: a #GstStructure
|
|
* @index: the index to get the name of
|
|
*
|
|
* Get the name of the given field number, counting from 0 onwards.
|
|
*
|
|
* Returns: the name of the given field number
|
|
*/
|
|
const gchar *
|
|
gst_structure_nth_field_name (const GstStructure * structure, guint index)
|
|
{
|
|
GstStructureField *field;
|
|
|
|
g_return_val_if_fail (structure != NULL, NULL);
|
|
g_return_val_if_fail (index < structure->fields->len, NULL);
|
|
|
|
field = GST_STRUCTURE_FIELD (structure, index);
|
|
|
|
return g_quark_to_string (field->name);
|
|
}
|
|
|
|
/**
|
|
* 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. The
|
|
* function must not modify the fields. Also see gst_structure_map_in_place().
|
|
*
|
|
* Returns: TRUE if the supplied function returns TRUE For each of the fields,
|
|
* FALSE otherwise.
|
|
*/
|
|
gboolean
|
|
gst_structure_foreach (const GstStructure * structure,
|
|
GstStructureForeachFunc func, gpointer user_data)
|
|
{
|
|
guint i;
|
|
GstStructureField *field;
|
|
gboolean ret;
|
|
|
|
g_return_val_if_fail (structure != NULL, FALSE);
|
|
g_return_val_if_fail (func != NULL, FALSE);
|
|
|
|
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_map_in_place:
|
|
* @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. In
|
|
* contrast to gst_structure_foreach(), the function may modify but not delete the
|
|
* fields. The structure must be mutable.
|
|
*
|
|
* Returns: TRUE if the supplied function returns TRUE For each of the fields,
|
|
* FALSE otherwise.
|
|
*/
|
|
gboolean
|
|
gst_structure_map_in_place (GstStructure * structure,
|
|
GstStructureMapFunc func, gpointer user_data)
|
|
{
|
|
guint i;
|
|
GstStructureField *field;
|
|
gboolean ret;
|
|
|
|
g_return_val_if_fail (structure != NULL, FALSE);
|
|
g_return_val_if_fail (IS_MUTABLE (structure), FALSE);
|
|
g_return_val_if_fail (func != NULL, FALSE);
|
|
|
|
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
|
|
*
|
|
* Check if @structure contains a field named @fieldname.
|
|
*
|
|
* 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
|
|
*
|
|
* Check if @structure contains a field named @fieldname and with GType @type.
|
|
*
|
|
* 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. If there was no field
|
|
* with @fieldname or the existing field did not contain a boolean, this
|
|
* function returns FALSE.
|
|
*/
|
|
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. If there was no field
|
|
* with @fieldname or the existing field did not contain an int, this function
|
|
* returns %FALSE.
|
|
*/
|
|
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_uint:
|
|
* @structure: a #GstStructure
|
|
* @fieldname: the name of a field
|
|
* @value: a pointer to a uint to set
|
|
*
|
|
* Sets the uint 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. If there was no field
|
|
* with @fieldname or the existing field did not contain a uint, this function
|
|
* returns %FALSE.
|
|
*
|
|
* Since: 0.10.15
|
|
*/
|
|
gboolean
|
|
gst_structure_get_uint (const GstStructure * structure,
|
|
const gchar * fieldname, guint * 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_UINT (&field->value))
|
|
return FALSE;
|
|
|
|
*value = g_value_get_uint (&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. If there was no field
|
|
* with @fieldname or the existing field did not contain a fourcc, this function
|
|
* returns FALSE.
|
|
*/
|
|
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_date:
|
|
* @structure: a #GstStructure
|
|
* @fieldname: the name of a field
|
|
* @value: a pointer to a #GDate to set
|
|
*
|
|
* Sets the date pointed to by @value corresponding to the date 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. If there was no field
|
|
* with @fieldname or the existing field did not contain a data, this function
|
|
* returns FALSE.
|
|
*/
|
|
gboolean
|
|
gst_structure_get_date (const GstStructure * structure, const gchar * fieldname,
|
|
GDate ** 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_DATE (&field->value))
|
|
return FALSE;
|
|
|
|
*value = g_value_dup_boxed (&field->value);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* gst_structure_get_clock_time:
|
|
* @structure: a #GstStructure
|
|
* @fieldname: the name of a field
|
|
* @value: a pointer to a #GstClockTime to set
|
|
*
|
|
* Sets the clock time pointed to by @value corresponding to the clock time
|
|
* 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. If there was no field
|
|
* with @fieldname or the existing field did not contain a #GstClockTime, this
|
|
* function returns FALSE.
|
|
*/
|
|
gboolean
|
|
gst_structure_get_clock_time (const GstStructure * structure,
|
|
const gchar * fieldname, GstClockTime * 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_UINT64 (&field->value))
|
|
return FALSE;
|
|
|
|
*value = g_value_get_uint64 (&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. If there was no field
|
|
* with @fieldname or the existing field did not contain a double, this
|
|
* function returns FALSE.
|
|
*/
|
|
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 or NULL when the field did not exist
|
|
* or did not contain a 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 NULL;
|
|
if (!G_VALUE_HOLDS_STRING (&field->value))
|
|
return NULL;
|
|
|
|
return g_value_get_string (&field->value);
|
|
}
|
|
|
|
/**
|
|
* gst_structure_get_enum:
|
|
* @structure: a #GstStructure
|
|
* @fieldname: the name of a field
|
|
* @enumtype: the enum type 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,
|
|
* has the correct type and that the enumtype is correct.
|
|
*
|
|
* Returns: TRUE if the value could be set correctly. If there was no field
|
|
* with @fieldname or the existing field did not contain an enum of the given
|
|
* type, this function returns FALSE.
|
|
*/
|
|
gboolean
|
|
gst_structure_get_enum (const GstStructure * structure,
|
|
const gchar * fieldname, GType enumtype, 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 (enumtype != G_TYPE_INVALID, 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_ENUM (&field->value))
|
|
return FALSE;
|
|
if (!G_TYPE_CHECK_VALUE_TYPE (&field->value, enumtype))
|
|
return FALSE;
|
|
|
|
*value = g_value_get_enum (&field->value);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* gst_structure_get_fraction:
|
|
* @structure: a #GstStructure
|
|
* @fieldname: the name of a field
|
|
* @value_numerator: a pointer to an int to set
|
|
* @value_denominator: a pointer to an int to set
|
|
*
|
|
* Sets the integers pointed to by @value_numerator and @value_denominator
|
|
* 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 values could be set correctly. If there was no field
|
|
* with @fieldname or the existing field did not contain a GstFraction, this
|
|
* function returns FALSE.
|
|
*/
|
|
gboolean
|
|
gst_structure_get_fraction (const GstStructure * structure,
|
|
const gchar * fieldname, gint * value_numerator, gint * value_denominator)
|
|
{
|
|
GstStructureField *field;
|
|
|
|
g_return_val_if_fail (structure != NULL, FALSE);
|
|
g_return_val_if_fail (fieldname != NULL, FALSE);
|
|
g_return_val_if_fail (value_numerator != NULL, FALSE);
|
|
g_return_val_if_fail (value_denominator != NULL, FALSE);
|
|
|
|
field = gst_structure_get_field (structure, fieldname);
|
|
|
|
if (field == NULL)
|
|
return FALSE;
|
|
if (!GST_VALUE_HOLDS_FRACTION (&field->value))
|
|
return FALSE;
|
|
|
|
*value_numerator = gst_value_get_fraction_numerator (&field->value);
|
|
*value_denominator = gst_value_get_fraction_denominator (&field->value);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
typedef struct _GstStructureAbbreviation
|
|
{
|
|
gchar *type_name;
|
|
GType type;
|
|
}
|
|
GstStructureAbbreviation;
|
|
|
|
/* return a copy of an array of GstStructureAbbreviation containing all the
|
|
* known type_string, GType maps, including abbreviations for common types */
|
|
static GstStructureAbbreviation *
|
|
gst_structure_get_abbrs (gint * n_abbrs)
|
|
{
|
|
static GstStructureAbbreviation *abbrs = NULL;
|
|
static gint num = 0;
|
|
|
|
if (abbrs == NULL) {
|
|
/* dynamically generate the array */
|
|
GstStructureAbbreviation dyn_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}
|
|
,
|
|
{"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}
|
|
,
|
|
{"structure", GST_TYPE_STRUCTURE}
|
|
};
|
|
num = G_N_ELEMENTS (dyn_abbrs);
|
|
/* permanently allocate and copy the array now */
|
|
abbrs = g_new0 (GstStructureAbbreviation, num);
|
|
memcpy (abbrs, dyn_abbrs, sizeof (GstStructureAbbreviation) * num);
|
|
}
|
|
*n_abbrs = num;
|
|
|
|
return abbrs;
|
|
}
|
|
|
|
/* given a type_name that could be a type abbreviation or a registered GType,
|
|
* return a matching GType */
|
|
static GType
|
|
gst_structure_gtype_from_abbr (const char *type_name)
|
|
{
|
|
int i;
|
|
GstStructureAbbreviation *abbrs;
|
|
gint n_abbrs;
|
|
|
|
g_return_val_if_fail (type_name != NULL, G_TYPE_INVALID);
|
|
|
|
abbrs = gst_structure_get_abbrs (&n_abbrs);
|
|
|
|
for (i = 0; i < n_abbrs; i++) {
|
|
if (strcmp (type_name, abbrs[i].type_name) == 0) {
|
|
return abbrs[i].type;
|
|
}
|
|
}
|
|
|
|
/* this is the fallback */
|
|
return g_type_from_name (type_name);
|
|
}
|
|
|
|
static const char *
|
|
gst_structure_to_abbr (GType type)
|
|
{
|
|
int i;
|
|
GstStructureAbbreviation *abbrs;
|
|
gint n_abbrs;
|
|
|
|
g_return_val_if_fail (type != G_TYPE_INVALID, NULL);
|
|
|
|
abbrs = gst_structure_get_abbrs (&n_abbrs);
|
|
|
|
for (i = 0; i < n_abbrs; i++) {
|
|
if (type == abbrs[i].type) {
|
|
return abbrs[i].type_name;
|
|
}
|
|
}
|
|
|
|
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_ARRAY) {
|
|
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;
|
|
} else if (G_VALUE_TYPE (val) == GST_TYPE_FRACTION_RANGE) {
|
|
return GST_TYPE_FRACTION;
|
|
}
|
|
return G_VALUE_TYPE (val);
|
|
}
|
|
|
|
/* keep in sync with gstvalue.c */
|
|
#define GST_ASCII_IS_STRING(c) (g_ascii_isalnum((c)) || ((c) == '_') || \
|
|
((c) == '-') || ((c) == '+') || ((c) == '/') || ((c) == ':') || \
|
|
((c) == '.'))
|
|
|
|
gboolean
|
|
priv_gst_structure_append_to_gstring (const GstStructure * structure,
|
|
GString * s)
|
|
{
|
|
GstStructureField *field;
|
|
guint i;
|
|
|
|
g_return_val_if_fail (s != NULL, FALSE);
|
|
|
|
g_string_append (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_len (s, ", ", 2);
|
|
/* FIXME: do we need to escape fieldnames? */
|
|
g_string_append (s, g_quark_to_string (field->name));
|
|
g_string_append_len (s, "=(", 2);
|
|
g_string_append (s, gst_structure_to_abbr (type));
|
|
g_string_append_c (s, ')');
|
|
g_string_append (s, GST_STR_NULL (t));
|
|
g_free (t);
|
|
}
|
|
|
|
g_string_append_c (s, ';');
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* gst_structure_to_string:
|
|
* @structure: a #GstStructure
|
|
*
|
|
* Converts @structure to a human-readable string representation.
|
|
*
|
|
* For debugging purposes its easier to do something like this:
|
|
* |[
|
|
* GST_LOG ("structure is %" GST_PTR_FORMAT, structure);
|
|
* ]|
|
|
* This prints the structure in human readble form.
|
|
*
|
|
* Returns: a pointer to string allocated by g_malloc(). g_free() after
|
|
* usage.
|
|
*/
|
|
gchar *
|
|
gst_structure_to_string (const GstStructure * structure)
|
|
{
|
|
GString *s;
|
|
|
|
/* 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);
|
|
|
|
/* we estimate a minimum size based on the number of fields in order to
|
|
* avoid unnecessary reallocs within GString */
|
|
s = g_string_sized_new (STRUCTURE_ESTIMATED_STRING_LEN (structure));
|
|
priv_gst_structure_append_to_gstring (structure, s);
|
|
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;
|
|
g_value_init (value, range_type);
|
|
gst_value_set_double_range (value, g_value_get_double (&value1),
|
|
g_value_get_double (&value2));
|
|
} else if (G_VALUE_TYPE (&value1) == G_TYPE_INT) {
|
|
range_type = GST_TYPE_INT_RANGE;
|
|
g_value_init (value, range_type);
|
|
gst_value_set_int_range (value, g_value_get_int (&value1),
|
|
g_value_get_int (&value2));
|
|
} else if (G_VALUE_TYPE (&value1) == GST_TYPE_FRACTION) {
|
|
range_type = GST_TYPE_FRACTION_RANGE;
|
|
g_value_init (value, range_type);
|
|
gst_value_set_fraction_range (value, &value1, &value2);
|
|
} else {
|
|
return FALSE;
|
|
}
|
|
|
|
*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_array (gchar * s, gchar ** after, GValue * value,
|
|
GType type)
|
|
{
|
|
return gst_structure_parse_any_list (s, after, value, type,
|
|
GST_TYPE_ARRAY, '<', '>');
|
|
}
|
|
|
|
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[0] == '\\' && g_ascii_isspace (s[1])))
|
|
s++;
|
|
name = s;
|
|
if (!gst_structure_parse_simple_string (s, &name_end))
|
|
return FALSE;
|
|
|
|
s = name_end;
|
|
while (g_ascii_isspace (*s) || (s[0] == '\\' && g_ascii_isspace (s[1])))
|
|
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++;
|
|
|
|
/* check if there's a (type_name) 'cast' */
|
|
type_name = NULL;
|
|
if (*s == '(') {
|
|
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_gtype_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_array (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, GST_TYPE_FRACTION, G_TYPE_BOOLEAN,
|
|
G_TYPE_STRING
|
|
};
|
|
int i;
|
|
|
|
for (i = 0; i < G_N_ELEMENTS (try_types); 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: pointer to store the end of the string in.
|
|
*
|
|
* Creates a #GstStructure from a string representation.
|
|
* If end is not NULL, a pointer to the place inside the given string
|
|
* where parsing ended will be returned.
|
|
*
|
|
* Returns: a new #GstStructure or NULL when the string could not
|
|
* be parsed. Free with gst_structure_free() after use.
|
|
*/
|
|
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;
|
|
|
|
/* skip spaces (FIXME: _isspace treats tabs and newlines as space!) */
|
|
while (*r && (g_ascii_isspace (*r) || (r[0] == '\\'
|
|
&& g_ascii_isspace (r[1]))))
|
|
r++;
|
|
|
|
name = r;
|
|
if (!gst_structure_parse_string (r, &w, &r)) {
|
|
GST_WARNING ("Failed to parse structure string");
|
|
goto error;
|
|
}
|
|
|
|
save = *w;
|
|
*w = 0;
|
|
structure = gst_structure_empty_new (name);
|
|
*w = save;
|
|
|
|
if (structure == NULL)
|
|
goto error;
|
|
|
|
do {
|
|
while (*r && (g_ascii_isspace (*r) || (r[0] == '\\'
|
|
&& g_ascii_isspace (r[1]))))
|
|
r++;
|
|
if (*r == ';') {
|
|
/* end of structure, get the next char and finish */
|
|
r++;
|
|
break;
|
|
}
|
|
if (*r == '\0') {
|
|
/* accept \0 as end delimiter */
|
|
break;
|
|
}
|
|
if (*r != ',') {
|
|
GST_WARNING ("Failed to find delimiter, r=%s", r);
|
|
goto error;
|
|
}
|
|
r++;
|
|
while (*r && (g_ascii_isspace (*r) || (r[0] == '\\'
|
|
&& g_ascii_isspace (r[1]))))
|
|
r++;
|
|
|
|
memset (&field, 0, sizeof (field));
|
|
if (!gst_structure_parse_field (r, &r, &field))
|
|
goto error;
|
|
gst_structure_set_field (structure, &field);
|
|
|
|
} while (TRUE);
|
|
|
|
if (end)
|
|
*end = (char *) string + (r - copy);
|
|
else if (*r)
|
|
g_warning ("gst_structure_from_string did not consume whole string,"
|
|
" but caller did not provide end pointer (\"%s\")", string);
|
|
|
|
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;
|
|
}
|
|
|
|
/* fixate utility functions */
|
|
|
|
/**
|
|
* gst_structure_fixate_field_nearest_int:
|
|
* @structure: a #GstStructure
|
|
* @field_name: a field in @structure
|
|
* @target: the target value of the fixation
|
|
*
|
|
* Fixates a #GstStructure by changing the given field to the nearest
|
|
* integer to @target that is a subset of the existing field.
|
|
*
|
|
* Returns: TRUE if the structure could be fixated
|
|
*/
|
|
gboolean
|
|
gst_structure_fixate_field_nearest_int (GstStructure * structure,
|
|
const char *field_name, int target)
|
|
{
|
|
const GValue *value;
|
|
|
|
g_return_val_if_fail (gst_structure_has_field (structure, field_name), FALSE);
|
|
g_return_val_if_fail (IS_MUTABLE (structure), FALSE);
|
|
|
|
value = gst_structure_get_value (structure, field_name);
|
|
|
|
if (G_VALUE_TYPE (value) == G_TYPE_INT) {
|
|
/* already fixed */
|
|
return FALSE;
|
|
} else if (G_VALUE_TYPE (value) == GST_TYPE_INT_RANGE) {
|
|
int x;
|
|
|
|
x = gst_value_get_int_range_min (value);
|
|
if (target < x)
|
|
target = x;
|
|
x = gst_value_get_int_range_max (value);
|
|
if (target > x)
|
|
target = x;
|
|
gst_structure_set (structure, field_name, G_TYPE_INT, target, NULL);
|
|
return TRUE;
|
|
} else if (G_VALUE_TYPE (value) == GST_TYPE_LIST) {
|
|
const GValue *list_value;
|
|
int i, n;
|
|
int best = 0;
|
|
int best_index = -1;
|
|
|
|
n = gst_value_list_get_size (value);
|
|
for (i = 0; i < n; i++) {
|
|
list_value = gst_value_list_get_value (value, i);
|
|
if (G_VALUE_TYPE (list_value) == G_TYPE_INT) {
|
|
int x = g_value_get_int (list_value);
|
|
|
|
if (best_index == -1 || (ABS (target - x) < ABS (target - best))) {
|
|
best_index = i;
|
|
best = x;
|
|
}
|
|
}
|
|
}
|
|
if (best_index != -1) {
|
|
gst_structure_set (structure, field_name, G_TYPE_INT, best, NULL);
|
|
return TRUE;
|
|
}
|
|
return FALSE;
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
/**
|
|
* gst_structure_fixate_field_nearest_double:
|
|
* @structure: a #GstStructure
|
|
* @field_name: a field in @structure
|
|
* @target: the target value of the fixation
|
|
*
|
|
* Fixates a #GstStructure by changing the given field to the nearest
|
|
* double to @target that is a subset of the existing field.
|
|
*
|
|
* Returns: TRUE if the structure could be fixated
|
|
*/
|
|
gboolean
|
|
gst_structure_fixate_field_nearest_double (GstStructure * structure,
|
|
const char *field_name, double target)
|
|
{
|
|
const GValue *value;
|
|
|
|
g_return_val_if_fail (gst_structure_has_field (structure, field_name), FALSE);
|
|
g_return_val_if_fail (IS_MUTABLE (structure), FALSE);
|
|
|
|
value = gst_structure_get_value (structure, field_name);
|
|
|
|
if (G_VALUE_TYPE (value) == G_TYPE_DOUBLE) {
|
|
/* already fixed */
|
|
return FALSE;
|
|
} else if (G_VALUE_TYPE (value) == GST_TYPE_DOUBLE_RANGE) {
|
|
double x;
|
|
|
|
x = gst_value_get_double_range_min (value);
|
|
if (target < x)
|
|
target = x;
|
|
x = gst_value_get_double_range_max (value);
|
|
if (target > x)
|
|
target = x;
|
|
gst_structure_set (structure, field_name, G_TYPE_DOUBLE, target, NULL);
|
|
return TRUE;
|
|
} else if (G_VALUE_TYPE (value) == GST_TYPE_LIST) {
|
|
const GValue *list_value;
|
|
int i, n;
|
|
double best = 0;
|
|
int best_index = -1;
|
|
|
|
n = gst_value_list_get_size (value);
|
|
for (i = 0; i < n; i++) {
|
|
list_value = gst_value_list_get_value (value, i);
|
|
if (G_VALUE_TYPE (list_value) == G_TYPE_DOUBLE) {
|
|
double x = g_value_get_double (list_value);
|
|
|
|
if (best_index == -1 || (ABS (target - x) < ABS (target - best))) {
|
|
best_index = i;
|
|
best = x;
|
|
}
|
|
}
|
|
}
|
|
if (best_index != -1) {
|
|
gst_structure_set (structure, field_name, G_TYPE_DOUBLE, best, NULL);
|
|
return TRUE;
|
|
}
|
|
return FALSE;
|
|
}
|
|
|
|
return FALSE;
|
|
|
|
}
|
|
|
|
/**
|
|
* gst_structure_fixate_field_boolean:
|
|
* @structure: a #GstStructure
|
|
* @field_name: a field in @structure
|
|
* @target: the target value of the fixation
|
|
*
|
|
* Fixates a #GstStructure by changing the given @field_name field to the given
|
|
* @target boolean if that field is not fixed yet.
|
|
*
|
|
* Returns: TRUE if the structure could be fixated
|
|
*/
|
|
gboolean
|
|
gst_structure_fixate_field_boolean (GstStructure * structure,
|
|
const char *field_name, gboolean target)
|
|
{
|
|
const GValue *value;
|
|
|
|
g_return_val_if_fail (gst_structure_has_field (structure, field_name), FALSE);
|
|
g_return_val_if_fail (IS_MUTABLE (structure), FALSE);
|
|
|
|
value = gst_structure_get_value (structure, field_name);
|
|
|
|
if (G_VALUE_TYPE (value) == G_TYPE_BOOLEAN) {
|
|
/* already fixed */
|
|
return FALSE;
|
|
} else if (G_VALUE_TYPE (value) == GST_TYPE_LIST) {
|
|
const GValue *list_value;
|
|
int i, n;
|
|
int best = 0;
|
|
int best_index = -1;
|
|
|
|
n = gst_value_list_get_size (value);
|
|
for (i = 0; i < n; i++) {
|
|
list_value = gst_value_list_get_value (value, i);
|
|
if (G_VALUE_TYPE (list_value) == G_TYPE_BOOLEAN) {
|
|
gboolean x = g_value_get_boolean (list_value);
|
|
|
|
if (best_index == -1 || x == target) {
|
|
best_index = i;
|
|
best = x;
|
|
}
|
|
}
|
|
}
|
|
if (best_index != -1) {
|
|
gst_structure_set (structure, field_name, G_TYPE_BOOLEAN, best, NULL);
|
|
return TRUE;
|
|
}
|
|
return FALSE;
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
/**
|
|
* gst_structure_fixate_field_nearest_fraction:
|
|
* @structure: a #GstStructure
|
|
* @field_name: a field in @structure
|
|
* @target_numerator: The numerator of the target value of the fixation
|
|
* @target_denominator: The denominator of the target value of the fixation
|
|
*
|
|
* Fixates a #GstStructure by changing the given field to the nearest
|
|
* fraction to @target_numerator/@target_denominator that is a subset
|
|
* of the existing field.
|
|
*
|
|
* Returns: TRUE if the structure could be fixated
|
|
*/
|
|
gboolean
|
|
gst_structure_fixate_field_nearest_fraction (GstStructure * structure,
|
|
const char *field_name, const gint target_numerator,
|
|
const gint target_denominator)
|
|
{
|
|
const GValue *value;
|
|
|
|
g_return_val_if_fail (gst_structure_has_field (structure, field_name), FALSE);
|
|
g_return_val_if_fail (IS_MUTABLE (structure), FALSE);
|
|
|
|
value = gst_structure_get_value (structure, field_name);
|
|
|
|
if (G_VALUE_TYPE (value) == GST_TYPE_FRACTION) {
|
|
/* already fixed */
|
|
return FALSE;
|
|
} else if (G_VALUE_TYPE (value) == GST_TYPE_FRACTION_RANGE) {
|
|
const GValue *x, *new_value;
|
|
GValue target = { 0 };
|
|
g_value_init (&target, GST_TYPE_FRACTION);
|
|
gst_value_set_fraction (&target, target_numerator, target_denominator);
|
|
|
|
new_value = ⌖
|
|
x = gst_value_get_fraction_range_min (value);
|
|
if (gst_value_compare (&target, x) == GST_VALUE_LESS_THAN)
|
|
new_value = x;
|
|
x = gst_value_get_fraction_range_max (value);
|
|
if (gst_value_compare (&target, x) == GST_VALUE_GREATER_THAN)
|
|
new_value = x;
|
|
|
|
gst_structure_set_value (structure, field_name, new_value);
|
|
g_value_unset (&target);
|
|
return TRUE;
|
|
} else if (G_VALUE_TYPE (value) == GST_TYPE_LIST) {
|
|
const GValue *list_value;
|
|
int i, n;
|
|
const GValue *best = NULL;
|
|
gdouble target;
|
|
gdouble cur_diff;
|
|
gdouble best_diff = G_MAXDOUBLE;
|
|
|
|
target = (gdouble) target_numerator / (gdouble) target_denominator;
|
|
|
|
GST_DEBUG ("target %g, best %g", target, best_diff);
|
|
|
|
best = NULL;
|
|
|
|
n = gst_value_list_get_size (value);
|
|
for (i = 0; i < n; i++) {
|
|
list_value = gst_value_list_get_value (value, i);
|
|
if (G_VALUE_TYPE (list_value) == GST_TYPE_FRACTION) {
|
|
gint num, denom;
|
|
gdouble list_double;
|
|
|
|
num = gst_value_get_fraction_numerator (list_value);
|
|
denom = gst_value_get_fraction_denominator (list_value);
|
|
|
|
list_double = ((gdouble) num / (gdouble) denom);
|
|
cur_diff = target - list_double;
|
|
|
|
GST_DEBUG ("curr diff %g, list %g", cur_diff, list_double);
|
|
|
|
if (cur_diff < 0)
|
|
cur_diff = -cur_diff;
|
|
|
|
if (!best || cur_diff < best_diff) {
|
|
GST_DEBUG ("new best %g", list_double);
|
|
best = list_value;
|
|
best_diff = cur_diff;
|
|
}
|
|
}
|
|
}
|
|
if (best != NULL) {
|
|
gst_structure_set_value (structure, field_name, best);
|
|
return TRUE;
|
|
}
|
|
}
|
|
|
|
return FALSE;
|
|
}
|