2 * Copyright (C) 2003 David A. Schleef <ds@schleef.org>
4 * gststructure.c: lists of { GQuark, GValue } tuples
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
19 * Boston, MA 02110-1301, USA.
23 * SECTION:gststructure
24 * @short_description: Generic structure containing fields of names and values
25 * @see_also: #GstCaps, #GstMessage, #GstEvent, #GstQuery
27 * A #GstStructure is a collection of key/value pairs. The keys are expressed
28 * as GQuarks and the values can be of any GType.
30 * In addition to the key/value pairs, a #GstStructure also has a name. The name
31 * starts with a letter and can be filled by letters, numbers and any of "/-_.:".
33 * #GstStructure is used by various GStreamer subsystems to store information
34 * in a flexible and extensible way. A #GstStructure does not have a refcount
35 * because it usually is part of a higher level object such as #GstCaps,
36 * #GstMessage, #GstEvent, #GstQuery. It provides a means to enforce mutability
37 * using the refcount of the parent with the gst_structure_set_parent_refcount()
40 * A #GstStructure can be created with gst_structure_new_empty() or
41 * gst_structure_new(), which both take a name and an optional set of
42 * key/value pairs along with the types of the values.
44 * Field values can be changed with gst_structure_set_value() or
45 * gst_structure_set().
47 * Field values can be retrieved with gst_structure_get_value() or the more
48 * convenient gst_structure_get_*() functions.
50 * Fields can be removed with gst_structure_remove_field() or
51 * gst_structure_remove_fields().
53 * Strings in structures must be ASCII or UTF-8 encoded. Other encodings are
54 * not allowed. Strings may be NULL however.
56 * Be aware that the current #GstCaps / #GstStructure serialization into string
57 * has limited support for nested #GstCaps / #GstStructure fields. It can only
58 * support one level of nesting. Using more levels will lead to unexpected
59 * behavior when using serialization features, such as gst_caps_to_string() or
60 * gst_value_serialize() and their counterparts.
62 * Last reviewed on 2012-03-29 (0.11.3)
71 #include "gst_private.h"
74 #include <gobject/gvaluecollector.h>
76 GST_DEBUG_CATEGORY_STATIC (gst_structure_debug);
77 #define GST_CAT_DEFAULT gst_structure_debug
79 typedef struct _GstStructureField GstStructureField;
81 struct _GstStructureField
91 /* owned by parent structure, NULL if no parent */
92 gint *parent_refcount;
97 #define GST_STRUCTURE_REFCOUNT(s) (((GstStructureImpl*)(s))->parent_refcount)
98 #define GST_STRUCTURE_FIELDS(s) (((GstStructureImpl*)(s))->fields)
100 #define GST_STRUCTURE_FIELD(structure, index) \
101 &g_array_index(GST_STRUCTURE_FIELDS(structure), GstStructureField, (index))
103 #define IS_MUTABLE(structure) \
104 (!GST_STRUCTURE_REFCOUNT(structure) || \
105 g_atomic_int_get (GST_STRUCTURE_REFCOUNT(structure)) == 1)
107 #define IS_TAGLIST(structure) \
108 (structure->name == GST_QUARK (TAGLIST))
110 static void gst_structure_set_field (GstStructure * structure,
111 GstStructureField * field);
112 static GstStructureField *gst_structure_get_field (const GstStructure *
113 structure, const gchar * fieldname);
114 static GstStructureField *gst_structure_id_get_field (const GstStructure *
115 structure, GQuark field);
116 static void gst_structure_transform_to_string (const GValue * src_value,
117 GValue * dest_value);
118 static GstStructure *gst_structure_copy_conditional (const GstStructure *
120 static gboolean gst_structure_parse_value (gchar * str, gchar ** after,
121 GValue * value, GType default_type);
122 static gboolean gst_structure_parse_simple_string (gchar * s, gchar ** end);
124 GType _gst_structure_type = 0;
127 G_DEFINE_BOXED_TYPE (GstStructure, gst_structure,
128 gst_structure_copy_conditional, gst_structure_free);
131 _priv_gst_structure_initialize (void)
133 _gst_structure_type = gst_structure_get_type ();
135 g_value_register_transform_func (_gst_structure_type, G_TYPE_STRING,
136 gst_structure_transform_to_string);
138 GST_DEBUG_CATEGORY_INIT (gst_structure_debug, "structure", 0,
139 "GstStructure debug");
142 static GstStructure *
143 gst_structure_new_id_empty_with_size (GQuark quark, guint prealloc)
145 GstStructureImpl *structure;
147 structure = g_slice_new (GstStructureImpl);
148 ((GstStructure *) structure)->type = _gst_structure_type;
149 ((GstStructure *) structure)->name = quark;
150 GST_STRUCTURE_REFCOUNT (structure) = NULL;
151 GST_STRUCTURE_FIELDS (structure) =
152 g_array_sized_new (FALSE, FALSE, sizeof (GstStructureField), prealloc);
154 GST_TRACE ("created structure %p", structure);
156 return GST_STRUCTURE_CAST (structure);
160 * gst_structure_new_id_empty:
161 * @quark: name of new structure
163 * Creates a new, empty #GstStructure with the given name as a GQuark.
165 * Free-function: gst_structure_free
167 * Returns: (transfer full): a new, empty #GstStructure
170 gst_structure_new_id_empty (GQuark quark)
172 g_return_val_if_fail (quark != 0, NULL);
174 return gst_structure_new_id_empty_with_size (quark, 0);
177 #ifndef G_DISABLE_CHECKS
179 gst_structure_validate_name (const gchar * name)
183 g_return_val_if_fail (name != NULL, FALSE);
185 if (G_UNLIKELY (!g_ascii_isalpha (*name))) {
186 GST_WARNING ("Invalid character '%c' at offset 0 in structure name: %s",
191 /* FIXME: test name string more */
193 while (*s && (g_ascii_isalnum (*s) || strchr ("/-_.:+", *s) != NULL))
195 if (G_UNLIKELY (*s != '\0')) {
196 GST_WARNING ("Invalid character '%c' at offset %" G_GUINTPTR_FORMAT " in"
197 " structure name: %s", *s, ((guintptr) s - (guintptr) name), name);
201 if (strncmp (name, "video/x-raw-", 12) == 0) {
202 g_warning ("0.10-style raw video caps are being created. Should be "
203 "video/x-raw,format=(string).. now.");
204 } else if (strncmp (name, "audio/x-raw-", 12) == 0) {
205 g_warning ("0.10-style raw audio caps are being created. Should be "
206 "audio/x-raw,format=(string).. now.");
214 * gst_structure_new_empty:
215 * @name: name of new structure
217 * Creates a new, empty #GstStructure with the given @name.
219 * See gst_structure_set_name() for constraints on the @name parameter.
221 * Free-function: gst_structure_free
223 * Returns: (transfer full): a new, empty #GstStructure
226 gst_structure_new_empty (const gchar * name)
228 g_return_val_if_fail (gst_structure_validate_name (name), NULL);
230 return gst_structure_new_id_empty_with_size (g_quark_from_string (name), 0);
235 * @name: name of new structure
236 * @firstfield: name of first field to set
237 * @...: additional arguments
239 * Creates a new #GstStructure with the given name. Parses the
240 * list of variable arguments and sets fields to the values listed.
241 * Variable arguments should be passed as field name, field type,
242 * and value. Last variable argument should be NULL.
244 * Free-function: gst_structure_free
246 * Returns: (transfer full): a new #GstStructure
249 gst_structure_new (const gchar * name, const gchar * firstfield, ...)
251 GstStructure *structure;
254 va_start (varargs, firstfield);
255 structure = gst_structure_new_valist (name, firstfield, varargs);
262 * gst_structure_new_valist:
263 * @name: name of new structure
264 * @firstfield: name of first field to set
265 * @varargs: variable argument list
267 * Creates a new #GstStructure with the given @name. Structure fields
268 * are set according to the varargs in a manner similar to
269 * gst_structure_new().
271 * See gst_structure_set_name() for constraints on the @name parameter.
273 * Free-function: gst_structure_free
275 * Returns: (transfer full): a new #GstStructure
278 gst_structure_new_valist (const gchar * name,
279 const gchar * firstfield, va_list varargs)
281 GstStructure *structure;
283 structure = gst_structure_new_empty (name);
286 gst_structure_set_valist (structure, firstfield, varargs);
292 * gst_structure_set_parent_refcount:
293 * @structure: a #GstStructure
294 * @refcount: (in): a pointer to the parent's refcount
296 * Sets the parent_refcount field of #GstStructure. This field is used to
297 * determine whether a structure is mutable or not. This function should only be
298 * called by code implementing parent objects of #GstStructure, as described in
299 * the MT Refcounting section of the design documents.
301 * Returns: %TRUE if the parent refcount could be set.
304 gst_structure_set_parent_refcount (GstStructure * structure, gint * refcount)
306 g_return_val_if_fail (structure != NULL, FALSE);
308 /* if we have a parent_refcount already, we can only clear
309 * if with a NULL refcount */
310 if (GST_STRUCTURE_REFCOUNT (structure)) {
311 if (refcount != NULL) {
312 g_return_val_if_fail (refcount == NULL, FALSE);
316 if (refcount == NULL) {
317 g_return_val_if_fail (refcount != NULL, FALSE);
322 GST_STRUCTURE_REFCOUNT (structure) = refcount;
328 * gst_structure_copy:
329 * @structure: a #GstStructure to duplicate
331 * Duplicates a #GstStructure and all its fields and values.
333 * Free-function: gst_structure_free
335 * Returns: (transfer full): a new #GstStructure.
338 gst_structure_copy (const GstStructure * structure)
340 GstStructure *new_structure;
341 GstStructureField *field;
344 g_return_val_if_fail (structure != NULL, NULL);
346 len = GST_STRUCTURE_FIELDS (structure)->len;
347 new_structure = gst_structure_new_id_empty_with_size (structure->name, len);
349 for (i = 0; i < len; i++) {
350 GstStructureField new_field = { 0 };
352 field = GST_STRUCTURE_FIELD (structure, i);
354 new_field.name = field->name;
355 gst_value_init_and_copy (&new_field.value, &field->value);
356 g_array_append_val (GST_STRUCTURE_FIELDS (new_structure), new_field);
358 GST_CAT_TRACE (GST_CAT_PERFORMANCE, "doing copy %p -> %p",
359 structure, new_structure);
361 return new_structure;
365 * gst_structure_free:
366 * @structure: (in) (transfer full): the #GstStructure to free
368 * Frees a #GstStructure and all its fields and values. The structure must not
369 * have a parent when this function is called.
372 gst_structure_free (GstStructure * structure)
374 GstStructureField *field;
377 g_return_if_fail (structure != NULL);
378 g_return_if_fail (GST_STRUCTURE_REFCOUNT (structure) == NULL);
380 len = GST_STRUCTURE_FIELDS (structure)->len;
381 for (i = 0; i < len; i++) {
382 field = GST_STRUCTURE_FIELD (structure, i);
384 if (G_IS_VALUE (&field->value)) {
385 g_value_unset (&field->value);
388 g_array_free (GST_STRUCTURE_FIELDS (structure), TRUE);
390 memset (structure, 0xff, sizeof (GstStructure));
392 GST_TRACE ("free structure %p", structure);
394 g_slice_free1 (sizeof (GstStructureImpl), structure);
398 * gst_structure_get_name:
399 * @structure: a #GstStructure
401 * Get the name of @structure as a string.
403 * Returns: the name of the structure.
406 gst_structure_get_name (const GstStructure * structure)
408 g_return_val_if_fail (structure != NULL, NULL);
410 return g_quark_to_string (structure->name);
414 * gst_structure_has_name:
415 * @structure: a #GstStructure
416 * @name: structure name to check for
418 * Checks if the structure has the given name
420 * Returns: TRUE if @name matches the name of the structure.
423 gst_structure_has_name (const GstStructure * structure, const gchar * name)
425 const gchar *structure_name;
427 g_return_val_if_fail (structure != NULL, FALSE);
428 g_return_val_if_fail (name != NULL, FALSE);
430 /* getting the string is cheap and comparing short strings is too
431 * should be faster than getting the quark for name and comparing the quarks
433 structure_name = g_quark_to_string (structure->name);
435 return (structure_name && strcmp (structure_name, name) == 0);
439 * gst_structure_get_name_id:
440 * @structure: a #GstStructure
442 * Get the name of @structure as a GQuark.
444 * Returns: the quark representing the name of the structure.
447 gst_structure_get_name_id (const GstStructure * structure)
449 g_return_val_if_fail (structure != NULL, 0);
451 return structure->name;
455 * gst_structure_set_name:
456 * @structure: a #GstStructure
457 * @name: the new name of the structure
459 * Sets the name of the structure to the given @name. The string
460 * provided is copied before being used. It must not be empty, start with a
461 * letter and can be followed by letters, numbers and any of "/-_.:".
464 gst_structure_set_name (GstStructure * structure, const gchar * name)
466 g_return_if_fail (structure != NULL);
467 g_return_if_fail (IS_MUTABLE (structure));
468 g_return_if_fail (gst_structure_validate_name (name));
470 structure->name = g_quark_from_string (name);
474 gst_structure_id_set_value_internal (GstStructure * structure, GQuark field,
475 const GValue * value)
477 GstStructureField gsfield = { 0, {0,} };
479 gsfield.name = field;
480 gst_value_init_and_copy (&gsfield.value, value);
482 gst_structure_set_field (structure, &gsfield);
486 * gst_structure_id_set_value:
487 * @structure: a #GstStructure
488 * @field: a #GQuark representing a field
489 * @value: the new value of the field
491 * Sets the field with the given GQuark @field to @value. If the field
492 * does not exist, it is created. If the field exists, the previous
493 * value is replaced and freed.
496 gst_structure_id_set_value (GstStructure * structure,
497 GQuark field, const GValue * value)
500 g_return_if_fail (structure != NULL);
501 g_return_if_fail (G_IS_VALUE (value));
502 g_return_if_fail (IS_MUTABLE (structure));
504 gst_structure_id_set_value_internal (structure, field, value);
508 * gst_structure_set_value:
509 * @structure: a #GstStructure
510 * @fieldname: the name of the field to set
511 * @value: the new value of the field
513 * Sets the field with the given name @field to @value. If the field
514 * does not exist, it is created. If the field exists, the previous
515 * value is replaced and freed.
518 gst_structure_set_value (GstStructure * structure,
519 const gchar * fieldname, const GValue * value)
521 g_return_if_fail (structure != NULL);
522 g_return_if_fail (fieldname != NULL);
523 g_return_if_fail (G_IS_VALUE (value));
524 g_return_if_fail (IS_MUTABLE (structure));
526 gst_structure_id_set_value_internal (structure,
527 g_quark_from_string (fieldname), value);
531 gst_structure_id_take_value_internal (GstStructure * structure, GQuark field,
534 GstStructureField gsfield = { 0, {0,} };
536 gsfield.name = field;
537 gsfield.value = *value;
539 gst_structure_set_field (structure, &gsfield);
541 /* we took ownership */
543 memset (value, 0, sizeof (GValue));
545 value->g_type = G_TYPE_INVALID;
550 * gst_structure_id_take_value:
551 * @structure: a #GstStructure
552 * @field: a #GQuark representing a field
553 * @value: (transfer full): the new value of the field
555 * Sets the field with the given GQuark @field to @value. If the field
556 * does not exist, it is created. If the field exists, the previous
557 * value is replaced and freed.
560 gst_structure_id_take_value (GstStructure * structure, GQuark field,
563 g_return_if_fail (structure != NULL);
564 g_return_if_fail (G_IS_VALUE (value));
565 g_return_if_fail (IS_MUTABLE (structure));
567 gst_structure_id_take_value_internal (structure, field, value);
571 * gst_structure_take_value:
572 * @structure: a #GstStructure
573 * @fieldname: the name of the field to set
574 * @value: (transfer full): the new value of the field
576 * Sets the field with the given name @field to @value. If the field
577 * does not exist, it is created. If the field exists, the previous
578 * value is replaced and freed. The function will take ownership of @value.
581 gst_structure_take_value (GstStructure * structure, const gchar * fieldname,
584 g_return_if_fail (structure != NULL);
585 g_return_if_fail (fieldname != NULL);
586 g_return_if_fail (G_IS_VALUE (value));
587 g_return_if_fail (IS_MUTABLE (structure));
589 gst_structure_id_take_value_internal (structure,
590 g_quark_from_string (fieldname), value);
594 gst_structure_set_valist_internal (GstStructure * structure,
595 const gchar * fieldname, va_list varargs)
601 GstStructureField field = { 0 };
603 field.name = g_quark_from_string (fieldname);
605 type = va_arg (varargs, GType);
607 G_VALUE_COLLECT_INIT (&field.value, type, varargs, 0, &err);
608 if (G_UNLIKELY (err)) {
609 g_critical ("%s", err);
612 gst_structure_set_field (structure, &field);
614 fieldname = va_arg (varargs, gchar *);
620 * @structure: a #GstStructure
621 * @fieldname: the name of the field to set
622 * @...: variable arguments
624 * Parses the variable arguments and sets fields accordingly.
625 * Variable arguments should be in the form field name, field type
626 * (as a GType), value(s). The last variable argument should be NULL.
629 gst_structure_set (GstStructure * structure, const gchar * field, ...)
633 g_return_if_fail (structure != NULL);
634 g_return_if_fail (IS_MUTABLE (structure) || field == NULL);
636 va_start (varargs, field);
637 gst_structure_set_valist_internal (structure, field, varargs);
642 * gst_structure_set_valist:
643 * @structure: a #GstStructure
644 * @fieldname: the name of the field to set
645 * @varargs: variable arguments
647 * va_list form of gst_structure_set().
650 gst_structure_set_valist (GstStructure * structure,
651 const gchar * fieldname, va_list varargs)
653 g_return_if_fail (structure != NULL);
654 g_return_if_fail (IS_MUTABLE (structure));
656 gst_structure_set_valist_internal (structure, fieldname, varargs);
660 gst_structure_id_set_valist_internal (GstStructure * structure,
661 GQuark fieldname, va_list varargs)
667 GstStructureField field = { 0 };
669 field.name = fieldname;
671 type = va_arg (varargs, GType);
673 #ifndef G_VALUE_COLLECT_INIT
674 g_value_init (&field.value, type);
675 G_VALUE_COLLECT (&field.value, varargs, 0, &err);
677 G_VALUE_COLLECT_INIT (&field.value, type, varargs, 0, &err);
679 if (G_UNLIKELY (err)) {
680 g_critical ("%s", err);
683 gst_structure_set_field (structure, &field);
685 fieldname = va_arg (varargs, GQuark);
690 * gst_structure_id_set:
691 * @structure: a #GstStructure
692 * @fieldname: the GQuark for the name of the field to set
693 * @...: variable arguments
695 * Identical to gst_structure_set, except that field names are
696 * passed using the GQuark for the field name. This allows more efficient
697 * setting of the structure if the caller already knows the associated
699 * The last variable argument must be NULL.
702 gst_structure_id_set (GstStructure * structure, GQuark field, ...)
706 g_return_if_fail (structure != NULL);
708 va_start (varargs, field);
709 gst_structure_id_set_valist_internal (structure, field, varargs);
714 * gst_structure_id_set_valist:
715 * @structure: a #GstStructure
716 * @fieldname: the name of the field to set
717 * @varargs: variable arguments
719 * va_list form of gst_structure_id_set().
722 gst_structure_id_set_valist (GstStructure * structure,
723 GQuark fieldname, va_list varargs)
725 g_return_if_fail (structure != NULL);
726 g_return_if_fail (IS_MUTABLE (structure));
728 gst_structure_id_set_valist_internal (structure, fieldname, varargs);
732 * gst_structure_new_id:
733 * @name_quark: name of new structure
734 * @field_quark: the GQuark for the name of the field to set
735 * @...: variable arguments
737 * Creates a new #GstStructure with the given name as a GQuark, followed by
738 * fieldname quark, GType, argument(s) "triplets" in the same format as
739 * gst_structure_id_set(). Basically a convenience wrapper around
740 * gst_structure_new_id_empty() and gst_structure_id_set().
742 * The last variable argument must be NULL (or 0).
744 * Free-function: gst_structure_free
746 * Returns: (transfer full): a new #GstStructure
749 gst_structure_new_id (GQuark name_quark, GQuark field_quark, ...)
754 g_return_val_if_fail (name_quark != 0, NULL);
755 g_return_val_if_fail (field_quark != 0, NULL);
757 s = gst_structure_new_id_empty (name_quark);
759 va_start (varargs, field_quark);
760 gst_structure_id_set_valist_internal (s, field_quark, varargs);
766 #if GST_VERSION_NANO == 1
767 #define GIT_G_WARNING g_warning
769 #define GIT_G_WARNING GST_WARNING
772 /* If the structure currently contains a field with the same name, it is
773 * replaced with the provided field. Otherwise, the field is added to the
774 * structure. The field's value is not deeply copied.
777 gst_structure_set_field (GstStructure * structure, GstStructureField * field)
779 GstStructureField *f;
780 guint i, len = GST_STRUCTURE_FIELDS (structure)->len;
782 if (G_UNLIKELY (G_VALUE_HOLDS_STRING (&field->value))) {
785 s = g_value_get_string (&field->value);
786 /* only check for NULL strings in taglists, as they are allowed in message
787 * structs, e.g. error message debug strings */
788 if (G_UNLIKELY (IS_TAGLIST (structure) && (s == NULL || *s == '\0'))) {
790 GIT_G_WARNING ("Trying to set NULL string on field '%s' on taglist. "
791 "Please file a bug.", g_quark_to_string (field->name));
792 g_value_unset (&field->value);
795 /* empty strings never make sense */
796 GIT_G_WARNING ("Trying to set empty string on taglist field '%s'. "
797 "Please file a bug.", g_quark_to_string (field->name));
798 g_value_unset (&field->value);
801 } else if (G_UNLIKELY (s != NULL && !g_utf8_validate (s, -1, NULL))) {
802 g_warning ("Trying to set string on %s field '%s', but string is not "
803 "valid UTF-8. Please file a bug.",
804 IS_TAGLIST (structure) ? "taglist" : "structure",
805 g_quark_to_string (field->name));
806 g_value_unset (&field->value);
809 } else if (G_UNLIKELY (G_VALUE_HOLDS (&field->value, G_TYPE_DATE))) {
812 d = g_value_get_boxed (&field->value);
813 /* only check for NULL GDates in taglists, as they might make sense
814 * in other, generic structs */
815 if (G_UNLIKELY ((IS_TAGLIST (structure) && d == NULL))) {
816 GIT_G_WARNING ("Trying to set NULL GDate on field '%s' on taglist. "
817 "Please file a bug.", g_quark_to_string (field->name));
818 g_value_unset (&field->value);
820 } else if (G_UNLIKELY (d != NULL && !g_date_valid (d))) {
822 ("Trying to set invalid GDate on %s field '%s'. Please file a bug.",
823 IS_TAGLIST (structure) ? "taglist" : "structure",
824 g_quark_to_string (field->name));
825 g_value_unset (&field->value);
830 for (i = 0; i < len; i++) {
831 f = GST_STRUCTURE_FIELD (structure, i);
833 if (G_UNLIKELY (f->name == field->name)) {
834 g_value_unset (&f->value);
835 memcpy (f, field, sizeof (GstStructureField));
840 g_array_append_val (GST_STRUCTURE_FIELDS (structure), *field);
843 /* If there is no field with the given ID, NULL is returned.
845 static GstStructureField *
846 gst_structure_id_get_field (const GstStructure * structure, GQuark field_id)
848 GstStructureField *field;
851 len = GST_STRUCTURE_FIELDS (structure)->len;
853 for (i = 0; i < len; i++) {
854 field = GST_STRUCTURE_FIELD (structure, i);
856 if (G_UNLIKELY (field->name == field_id))
863 /* If there is no field with the given ID, NULL is returned.
865 static GstStructureField *
866 gst_structure_get_field (const GstStructure * structure,
867 const gchar * fieldname)
869 g_return_val_if_fail (structure != NULL, NULL);
870 g_return_val_if_fail (fieldname != NULL, NULL);
872 return gst_structure_id_get_field (structure,
873 g_quark_from_string (fieldname));
877 * gst_structure_get_value:
878 * @structure: a #GstStructure
879 * @fieldname: the name of the field to get
881 * Get the value of the field with name @fieldname.
883 * Returns: the #GValue corresponding to the field with the given name.
886 gst_structure_get_value (const GstStructure * structure,
887 const gchar * fieldname)
889 GstStructureField *field;
891 g_return_val_if_fail (structure != NULL, NULL);
892 g_return_val_if_fail (fieldname != NULL, NULL);
894 field = gst_structure_get_field (structure, fieldname);
898 return &field->value;
902 * gst_structure_id_get_value:
903 * @structure: a #GstStructure
904 * @field: the #GQuark of the field to get
906 * Get the value of the field with GQuark @field.
908 * Returns: the #GValue corresponding to the field with the given name
912 gst_structure_id_get_value (const GstStructure * structure, GQuark field)
914 GstStructureField *gsfield;
916 g_return_val_if_fail (structure != NULL, NULL);
918 gsfield = gst_structure_id_get_field (structure, field);
922 return &gsfield->value;
926 * gst_structure_remove_field:
927 * @structure: a #GstStructure
928 * @fieldname: the name of the field to remove
930 * Removes the field with the given name. If the field with the given
931 * name does not exist, the structure is unchanged.
934 gst_structure_remove_field (GstStructure * structure, const gchar * fieldname)
936 GstStructureField *field;
940 g_return_if_fail (structure != NULL);
941 g_return_if_fail (fieldname != NULL);
942 g_return_if_fail (IS_MUTABLE (structure));
944 id = g_quark_from_string (fieldname);
945 len = GST_STRUCTURE_FIELDS (structure)->len;
947 for (i = 0; i < len; i++) {
948 field = GST_STRUCTURE_FIELD (structure, i);
950 if (field->name == id) {
951 if (G_IS_VALUE (&field->value)) {
952 g_value_unset (&field->value);
954 GST_STRUCTURE_FIELDS (structure) =
955 g_array_remove_index (GST_STRUCTURE_FIELDS (structure), i);
962 * gst_structure_remove_fields:
963 * @structure: a #GstStructure
964 * @fieldname: the name of the field to remove
965 * @...: NULL-terminated list of more fieldnames to remove
967 * Removes the fields with the given names. If a field does not exist, the
968 * argument is ignored.
971 gst_structure_remove_fields (GstStructure * structure,
972 const gchar * fieldname, ...)
976 g_return_if_fail (structure != NULL);
977 g_return_if_fail (fieldname != NULL);
978 /* mutability checked in remove_field */
980 va_start (varargs, fieldname);
981 gst_structure_remove_fields_valist (structure, fieldname, varargs);
986 * gst_structure_remove_fields_valist:
987 * @structure: a #GstStructure
988 * @fieldname: the name of the field to remove
989 * @varargs: NULL-terminated list of more fieldnames to remove
991 * va_list form of gst_structure_remove_fields().
994 gst_structure_remove_fields_valist (GstStructure * structure,
995 const gchar * fieldname, va_list varargs)
997 gchar *field = (gchar *) fieldname;
999 g_return_if_fail (structure != NULL);
1000 g_return_if_fail (fieldname != NULL);
1001 /* mutability checked in remove_field */
1004 gst_structure_remove_field (structure, field);
1005 field = va_arg (varargs, char *);
1010 * gst_structure_remove_all_fields:
1011 * @structure: a #GstStructure
1013 * Removes all fields in a GstStructure.
1016 gst_structure_remove_all_fields (GstStructure * structure)
1018 GstStructureField *field;
1021 g_return_if_fail (structure != NULL);
1022 g_return_if_fail (IS_MUTABLE (structure));
1024 for (i = GST_STRUCTURE_FIELDS (structure)->len - 1; i >= 0; i--) {
1025 field = GST_STRUCTURE_FIELD (structure, i);
1027 if (G_IS_VALUE (&field->value)) {
1028 g_value_unset (&field->value);
1030 GST_STRUCTURE_FIELDS (structure) =
1031 g_array_remove_index (GST_STRUCTURE_FIELDS (structure), i);
1036 * gst_structure_get_field_type:
1037 * @structure: a #GstStructure
1038 * @fieldname: the name of the field
1040 * Finds the field with the given name, and returns the type of the
1041 * value it contains. If the field is not found, G_TYPE_INVALID is
1044 * Returns: the #GValue of the field
1047 gst_structure_get_field_type (const GstStructure * structure,
1048 const gchar * fieldname)
1050 GstStructureField *field;
1052 g_return_val_if_fail (structure != NULL, G_TYPE_INVALID);
1053 g_return_val_if_fail (fieldname != NULL, G_TYPE_INVALID);
1055 field = gst_structure_get_field (structure, fieldname);
1057 return G_TYPE_INVALID;
1059 return G_VALUE_TYPE (&field->value);
1063 * gst_structure_n_fields:
1064 * @structure: a #GstStructure
1066 * Get the number of fields in the structure.
1068 * Returns: the number of fields in the structure
1071 gst_structure_n_fields (const GstStructure * structure)
1073 g_return_val_if_fail (structure != NULL, 0);
1075 return GST_STRUCTURE_FIELDS (structure)->len;
1079 * gst_structure_nth_field_name:
1080 * @structure: a #GstStructure
1081 * @index: the index to get the name of
1083 * Get the name of the given field number, counting from 0 onwards.
1085 * Returns: the name of the given field number
1088 gst_structure_nth_field_name (const GstStructure * structure, guint index)
1090 GstStructureField *field;
1092 g_return_val_if_fail (structure != NULL, NULL);
1093 g_return_val_if_fail (index < GST_STRUCTURE_FIELDS (structure)->len, NULL);
1095 field = GST_STRUCTURE_FIELD (structure, index);
1097 return g_quark_to_string (field->name);
1101 * gst_structure_foreach:
1102 * @structure: a #GstStructure
1103 * @func: (scope call): a function to call for each field
1104 * @user_data: (closure): private data
1106 * Calls the provided function once for each field in the #GstStructure. The
1107 * function must not modify the fields. Also see gst_structure_map_in_place().
1109 * Returns: TRUE if the supplied function returns TRUE For each of the fields,
1113 gst_structure_foreach (const GstStructure * structure,
1114 GstStructureForeachFunc func, gpointer user_data)
1117 GstStructureField *field;
1120 g_return_val_if_fail (structure != NULL, FALSE);
1121 g_return_val_if_fail (func != NULL, FALSE);
1123 len = GST_STRUCTURE_FIELDS (structure)->len;
1125 for (i = 0; i < len; i++) {
1126 field = GST_STRUCTURE_FIELD (structure, i);
1128 ret = func (field->name, &field->value, user_data);
1129 if (G_UNLIKELY (!ret))
1137 * gst_structure_map_in_place:
1138 * @structure: a #GstStructure
1139 * @func: (scope call): a function to call for each field
1140 * @user_data: (closure): private data
1142 * Calls the provided function once for each field in the #GstStructure. In
1143 * contrast to gst_structure_foreach(), the function may modify but not delete the
1144 * fields. The structure must be mutable.
1146 * Returns: TRUE if the supplied function returns TRUE For each of the fields,
1150 gst_structure_map_in_place (GstStructure * structure,
1151 GstStructureMapFunc func, gpointer user_data)
1154 GstStructureField *field;
1157 g_return_val_if_fail (structure != NULL, FALSE);
1158 g_return_val_if_fail (IS_MUTABLE (structure), FALSE);
1159 g_return_val_if_fail (func != NULL, FALSE);
1160 len = GST_STRUCTURE_FIELDS (structure)->len;
1162 for (i = 0; i < len; i++) {
1163 field = GST_STRUCTURE_FIELD (structure, i);
1165 ret = func (field->name, &field->value, user_data);
1174 * gst_structure_id_has_field:
1175 * @structure: a #GstStructure
1176 * @field: #GQuark of the field name
1178 * Check if @structure contains a field named @field.
1180 * Returns: TRUE if the structure contains a field with the given name
1183 gst_structure_id_has_field (const GstStructure * structure, GQuark field)
1185 GstStructureField *f;
1187 g_return_val_if_fail (structure != NULL, FALSE);
1188 g_return_val_if_fail (field != 0, FALSE);
1190 f = gst_structure_id_get_field (structure, field);
1196 * gst_structure_has_field:
1197 * @structure: a #GstStructure
1198 * @fieldname: the name of a field
1200 * Check if @structure contains a field named @fieldname.
1202 * Returns: TRUE if the structure contains a field with the given name
1205 gst_structure_has_field (const GstStructure * structure,
1206 const gchar * fieldname)
1208 g_return_val_if_fail (structure != NULL, FALSE);
1209 g_return_val_if_fail (fieldname != NULL, FALSE);
1211 return gst_structure_id_has_field (structure,
1212 g_quark_from_string (fieldname));
1216 * gst_structure_id_has_field_typed:
1217 * @structure: a #GstStructure
1218 * @field: #GQuark of the field name
1219 * @type: the type of a value
1221 * Check if @structure contains a field named @field and with GType @type.
1223 * Returns: TRUE if the structure contains a field with the given name and type
1226 gst_structure_id_has_field_typed (const GstStructure * structure,
1227 GQuark field, GType type)
1229 GstStructureField *f;
1231 g_return_val_if_fail (structure != NULL, FALSE);
1232 g_return_val_if_fail (field != 0, FALSE);
1234 f = gst_structure_id_get_field (structure, field);
1238 return (G_VALUE_TYPE (&f->value) == type);
1242 * gst_structure_has_field_typed:
1243 * @structure: a #GstStructure
1244 * @fieldname: the name of a field
1245 * @type: the type of a value
1247 * Check if @structure contains a field named @fieldname and with GType @type.
1249 * Returns: TRUE if the structure contains a field with the given name and type
1252 gst_structure_has_field_typed (const GstStructure * structure,
1253 const gchar * fieldname, GType type)
1255 g_return_val_if_fail (structure != NULL, FALSE);
1256 g_return_val_if_fail (fieldname != NULL, FALSE);
1258 return gst_structure_id_has_field_typed (structure,
1259 g_quark_from_string (fieldname), type);
1262 /* utility functions */
1265 * gst_structure_get_boolean:
1266 * @structure: a #GstStructure
1267 * @fieldname: the name of a field
1268 * @value: (out): a pointer to a #gboolean to set
1270 * Sets the boolean pointed to by @value corresponding to the value of the
1271 * given field. Caller is responsible for making sure the field exists
1272 * and has the correct type.
1274 * Returns: TRUE if the value could be set correctly. If there was no field
1275 * with @fieldname or the existing field did not contain a boolean, this
1276 * function returns FALSE.
1279 gst_structure_get_boolean (const GstStructure * structure,
1280 const gchar * fieldname, gboolean * value)
1282 GstStructureField *field;
1284 g_return_val_if_fail (structure != NULL, FALSE);
1285 g_return_val_if_fail (fieldname != NULL, FALSE);
1287 field = gst_structure_get_field (structure, fieldname);
1291 if (!G_VALUE_HOLDS_BOOLEAN (&field->value))
1294 *value = gst_g_value_get_boolean_unchecked (&field->value);
1300 * gst_structure_get_int:
1301 * @structure: a #GstStructure
1302 * @fieldname: the name of a field
1303 * @value: (out): a pointer to an int to set
1305 * Sets the int pointed to by @value corresponding to the value of the
1306 * given field. Caller is responsible for making sure the field exists
1307 * and has the correct type.
1309 * Returns: %TRUE if the value could be set correctly. If there was no field
1310 * with @fieldname or the existing field did not contain an int, this function
1314 gst_structure_get_int (const GstStructure * structure,
1315 const gchar * fieldname, gint * value)
1317 GstStructureField *field;
1319 g_return_val_if_fail (structure != NULL, FALSE);
1320 g_return_val_if_fail (fieldname != NULL, FALSE);
1321 g_return_val_if_fail (value != NULL, FALSE);
1323 field = gst_structure_get_field (structure, fieldname);
1327 if (!G_VALUE_HOLDS_INT (&field->value))
1330 *value = gst_g_value_get_int_unchecked (&field->value);
1336 * gst_structure_get_uint:
1337 * @structure: a #GstStructure
1338 * @fieldname: the name of a field
1339 * @value: (out): a pointer to a uint to set
1341 * Sets the uint pointed to by @value corresponding to the value of the
1342 * given field. Caller is responsible for making sure the field exists
1343 * and has the correct type.
1345 * Returns: %TRUE if the value could be set correctly. If there was no field
1346 * with @fieldname or the existing field did not contain a uint, this function
1350 gst_structure_get_uint (const GstStructure * structure,
1351 const gchar * fieldname, guint * value)
1353 GstStructureField *field;
1355 g_return_val_if_fail (structure != NULL, FALSE);
1356 g_return_val_if_fail (fieldname != NULL, FALSE);
1357 g_return_val_if_fail (value != NULL, FALSE);
1359 field = gst_structure_get_field (structure, fieldname);
1363 if (!G_VALUE_HOLDS_UINT (&field->value))
1366 *value = gst_g_value_get_uint_unchecked (&field->value);
1372 * gst_structure_get_int64:
1373 * @structure: a #GstStructure
1374 * @fieldname: the name of a field
1375 * @value: (out): a pointer to an int64 to set
1377 * Sets the int64 pointed to by @value corresponding to the value of the
1378 * given field. Caller is responsible for making sure the field exists
1379 * and has the correct type.
1381 * Returns: %TRUE if the value could be set correctly. If there was no field
1382 * with @fieldname or the existing field did not contain an int64, this function
1388 gst_structure_get_int64 (const GstStructure * structure,
1389 const gchar * fieldname, gint64 * value)
1391 GstStructureField *field;
1393 g_return_val_if_fail (structure != NULL, FALSE);
1394 g_return_val_if_fail (fieldname != NULL, FALSE);
1395 g_return_val_if_fail (value != NULL, FALSE);
1397 field = gst_structure_get_field (structure, fieldname);
1401 if (!G_VALUE_HOLDS_INT64 (&field->value))
1404 *value = gst_g_value_get_int64_unchecked (&field->value);
1410 * gst_structure_get_uint64:
1411 * @structure: a #GstStructure
1412 * @fieldname: the name of a field
1413 * @value: (out): a pointer to a uint64 to set
1415 * Sets the uint64 pointed to by @value corresponding to the value of the
1416 * given field. Caller is responsible for making sure the field exists
1417 * and has the correct type.
1419 * Returns: %TRUE if the value could be set correctly. If there was no field
1420 * with @fieldname or the existing field did not contain a uint64, this function
1426 gst_structure_get_uint64 (const GstStructure * structure,
1427 const gchar * fieldname, guint64 * value)
1429 GstStructureField *field;
1431 g_return_val_if_fail (structure != NULL, FALSE);
1432 g_return_val_if_fail (fieldname != NULL, FALSE);
1433 g_return_val_if_fail (value != NULL, FALSE);
1435 field = gst_structure_get_field (structure, fieldname);
1439 if (!G_VALUE_HOLDS_UINT64 (&field->value))
1442 *value = gst_g_value_get_uint64_unchecked (&field->value);
1448 * gst_structure_get_date:
1449 * @structure: a #GstStructure
1450 * @fieldname: the name of a field
1451 * @value: (out callee-allocates): a pointer to a #GDate to set
1453 * Sets the date pointed to by @value corresponding to the date of the
1454 * given field. Caller is responsible for making sure the field exists
1455 * and has the correct type.
1457 * On success @value will point to a newly-allocated copy of the date which
1458 * should be freed with g_date_free() when no longer needed (note: this is
1459 * inconsistent with e.g. gst_structure_get_string() which doesn't return a
1460 * copy of the string).
1462 * Returns: TRUE if the value could be set correctly. If there was no field
1463 * with @fieldname or the existing field did not contain a data, this function
1467 gst_structure_get_date (const GstStructure * structure, const gchar * fieldname,
1470 GstStructureField *field;
1472 g_return_val_if_fail (structure != NULL, FALSE);
1473 g_return_val_if_fail (fieldname != NULL, FALSE);
1474 g_return_val_if_fail (value != NULL, FALSE);
1476 field = gst_structure_get_field (structure, fieldname);
1480 if (!G_VALUE_HOLDS (&field->value, G_TYPE_DATE))
1483 /* FIXME: 0.11 g_value_dup_boxed() -> g_value_get_boxed() */
1484 *value = g_value_dup_boxed (&field->value);
1490 * gst_structure_get_date_time:
1491 * @structure: a #GstStructure
1492 * @fieldname: the name of a field
1493 * @value: (out callee-allocates): a pointer to a #GstDateTime to set
1495 * Sets the datetime pointed to by @value corresponding to the datetime of the
1496 * given field. Caller is responsible for making sure the field exists
1497 * and has the correct type.
1499 * On success @value will point to a reference of the datetime which
1500 * should be unreffed with gst_date_time_unref() when no longer needed
1501 * (note: this is inconsistent with e.g. gst_structure_get_string()
1502 * which doesn't return a copy of the string).
1504 * Returns: TRUE if the value could be set correctly. If there was no field
1505 * with @fieldname or the existing field did not contain a data, this function
1509 gst_structure_get_date_time (const GstStructure * structure,
1510 const gchar * fieldname, GstDateTime ** value)
1512 GstStructureField *field;
1514 g_return_val_if_fail (structure != NULL, FALSE);
1515 g_return_val_if_fail (fieldname != NULL, FALSE);
1516 g_return_val_if_fail (value != NULL, FALSE);
1518 field = gst_structure_get_field (structure, fieldname);
1522 if (!GST_VALUE_HOLDS_DATE_TIME (&field->value))
1525 /* FIXME: 0.11 g_value_dup_boxed() -> g_value_get_boxed() */
1526 *value = g_value_dup_boxed (&field->value);
1532 * gst_structure_get_clock_time:
1533 * @structure: a #GstStructure
1534 * @fieldname: the name of a field
1535 * @value: (out): a pointer to a #GstClockTime to set
1537 * Sets the clock time pointed to by @value corresponding to the clock time
1538 * of the given field. Caller is responsible for making sure the field exists
1539 * and has the correct type.
1541 * Returns: TRUE if the value could be set correctly. If there was no field
1542 * with @fieldname or the existing field did not contain a #GstClockTime, this
1543 * function returns FALSE.
1546 gst_structure_get_clock_time (const GstStructure * structure,
1547 const gchar * fieldname, GstClockTime * value)
1549 GstStructureField *field;
1551 g_return_val_if_fail (structure != NULL, FALSE);
1552 g_return_val_if_fail (fieldname != NULL, FALSE);
1553 g_return_val_if_fail (value != NULL, FALSE);
1555 field = gst_structure_get_field (structure, fieldname);
1559 if (!G_VALUE_HOLDS_UINT64 (&field->value))
1562 *value = gst_g_value_get_uint64_unchecked (&field->value);
1568 * gst_structure_get_double:
1569 * @structure: a #GstStructure
1570 * @fieldname: the name of a field
1571 * @value: (out): a pointer to a gdouble to set
1573 * Sets the double pointed to by @value corresponding to the value of the
1574 * given field. Caller is responsible for making sure the field exists
1575 * and has the correct type.
1577 * Returns: TRUE if the value could be set correctly. If there was no field
1578 * with @fieldname or the existing field did not contain a double, this
1579 * function returns FALSE.
1582 gst_structure_get_double (const GstStructure * structure,
1583 const gchar * fieldname, gdouble * value)
1585 GstStructureField *field;
1587 g_return_val_if_fail (structure != NULL, FALSE);
1588 g_return_val_if_fail (fieldname != NULL, FALSE);
1589 g_return_val_if_fail (value != NULL, FALSE);
1591 field = gst_structure_get_field (structure, fieldname);
1595 if (!G_VALUE_HOLDS_DOUBLE (&field->value))
1598 *value = gst_g_value_get_double_unchecked (&field->value);
1604 * gst_structure_get_string:
1605 * @structure: a #GstStructure
1606 * @fieldname: the name of a field
1608 * Finds the field corresponding to @fieldname, and returns the string
1609 * contained in the field's value. Caller is responsible for making
1610 * sure the field exists and has the correct type.
1612 * The string should not be modified, and remains valid until the next
1613 * call to a gst_structure_*() function with the given structure.
1615 * Returns: a pointer to the string or NULL when the field did not exist
1616 * or did not contain a string.
1619 gst_structure_get_string (const GstStructure * structure,
1620 const gchar * fieldname)
1622 GstStructureField *field;
1624 g_return_val_if_fail (structure != NULL, NULL);
1625 g_return_val_if_fail (fieldname != NULL, NULL);
1627 field = gst_structure_get_field (structure, fieldname);
1631 if (!G_VALUE_HOLDS_STRING (&field->value))
1634 return gst_g_value_get_string_unchecked (&field->value);
1638 * gst_structure_get_enum:
1639 * @structure: a #GstStructure
1640 * @fieldname: the name of a field
1641 * @enumtype: the enum type of a field
1642 * @value: (out): a pointer to an int to set
1644 * Sets the int pointed to by @value corresponding to the value of the
1645 * given field. Caller is responsible for making sure the field exists,
1646 * has the correct type and that the enumtype is correct.
1648 * Returns: TRUE if the value could be set correctly. If there was no field
1649 * with @fieldname or the existing field did not contain an enum of the given
1650 * type, this function returns FALSE.
1653 gst_structure_get_enum (const GstStructure * structure,
1654 const gchar * fieldname, GType enumtype, gint * value)
1656 GstStructureField *field;
1658 g_return_val_if_fail (structure != NULL, FALSE);
1659 g_return_val_if_fail (fieldname != NULL, FALSE);
1660 g_return_val_if_fail (enumtype != G_TYPE_INVALID, FALSE);
1661 g_return_val_if_fail (value != NULL, FALSE);
1663 field = gst_structure_get_field (structure, fieldname);
1667 if (!G_TYPE_CHECK_VALUE_TYPE (&field->value, enumtype))
1670 *value = g_value_get_enum (&field->value);
1676 * gst_structure_get_fraction:
1677 * @structure: a #GstStructure
1678 * @fieldname: the name of a field
1679 * @value_numerator: (out): a pointer to an int to set
1680 * @value_denominator: (out): a pointer to an int to set
1682 * Sets the integers pointed to by @value_numerator and @value_denominator
1683 * corresponding to the value of the given field. Caller is responsible
1684 * for making sure the field exists and has the correct type.
1686 * Returns: TRUE if the values could be set correctly. If there was no field
1687 * with @fieldname or the existing field did not contain a GstFraction, this
1688 * function returns FALSE.
1691 gst_structure_get_fraction (const GstStructure * structure,
1692 const gchar * fieldname, gint * value_numerator, gint * value_denominator)
1694 GstStructureField *field;
1696 g_return_val_if_fail (structure != NULL, FALSE);
1697 g_return_val_if_fail (fieldname != NULL, FALSE);
1698 g_return_val_if_fail (value_numerator != NULL, FALSE);
1699 g_return_val_if_fail (value_denominator != NULL, FALSE);
1701 field = gst_structure_get_field (structure, fieldname);
1705 if (!GST_VALUE_HOLDS_FRACTION (&field->value))
1708 *value_numerator = gst_value_get_fraction_numerator (&field->value);
1709 *value_denominator = gst_value_get_fraction_denominator (&field->value);
1714 typedef struct _GstStructureAbbreviation
1716 const gchar *type_name;
1719 GstStructureAbbreviation;
1721 /* return a copy of an array of GstStructureAbbreviation containing all the
1722 * known type_string, GType maps, including abbreviations for common types */
1723 static GstStructureAbbreviation *
1724 gst_structure_get_abbrs (gint * n_abbrs)
1726 static GstStructureAbbreviation *abbrs = NULL;
1727 static volatile gsize num = 0;
1729 if (g_once_init_enter (&num)) {
1730 /* dynamically generate the array */
1732 GstStructureAbbreviation dyn_abbrs[] = {
1737 {"uint", G_TYPE_UINT}
1741 {"float", G_TYPE_FLOAT}
1745 {"double", G_TYPE_DOUBLE}
1747 {"d", G_TYPE_DOUBLE}
1749 {"buffer", GST_TYPE_BUFFER}
1751 {"fraction", GST_TYPE_FRACTION}
1753 {"boolean", G_TYPE_BOOLEAN}
1755 {"bool", G_TYPE_BOOLEAN}
1757 {"b", G_TYPE_BOOLEAN}
1759 {"string", G_TYPE_STRING}
1761 {"str", G_TYPE_STRING}
1763 {"s", G_TYPE_STRING}
1765 {"structure", GST_TYPE_STRUCTURE}
1767 {"date", G_TYPE_DATE}
1769 {"datetime", GST_TYPE_DATE_TIME}
1771 {"bitmask", GST_TYPE_BITMASK}
1773 {"sample", GST_TYPE_SAMPLE}
1775 {"taglist", GST_TYPE_TAG_LIST}
1777 _num = G_N_ELEMENTS (dyn_abbrs);
1778 /* permanently allocate and copy the array now */
1779 abbrs = g_new0 (GstStructureAbbreviation, _num);
1780 memcpy (abbrs, dyn_abbrs, sizeof (GstStructureAbbreviation) * _num);
1781 g_once_init_leave (&num, _num);
1788 /* given a type_name that could be a type abbreviation or a registered GType,
1789 * return a matching GType */
1791 gst_structure_gtype_from_abbr (const char *type_name)
1794 GstStructureAbbreviation *abbrs;
1797 g_return_val_if_fail (type_name != NULL, G_TYPE_INVALID);
1799 abbrs = gst_structure_get_abbrs (&n_abbrs);
1801 for (i = 0; i < n_abbrs; i++) {
1802 if (strcmp (type_name, abbrs[i].type_name) == 0) {
1803 return abbrs[i].type;
1807 /* this is the fallback */
1808 return g_type_from_name (type_name);
1812 gst_structure_to_abbr (GType type)
1815 GstStructureAbbreviation *abbrs;
1818 g_return_val_if_fail (type != G_TYPE_INVALID, NULL);
1820 abbrs = gst_structure_get_abbrs (&n_abbrs);
1822 for (i = 0; i < n_abbrs; i++) {
1823 if (type == abbrs[i].type) {
1824 return abbrs[i].type_name;
1828 return g_type_name (type);
1832 gst_structure_value_get_generic_type (GValue * val)
1834 if (G_VALUE_TYPE (val) == GST_TYPE_LIST
1835 || G_VALUE_TYPE (val) == GST_TYPE_ARRAY) {
1836 GArray *array = g_value_peek_pointer (val);
1838 if (array->len > 0) {
1839 GValue *value = &g_array_index (array, GValue, 0);
1841 return gst_structure_value_get_generic_type (value);
1845 } else if (G_VALUE_TYPE (val) == GST_TYPE_INT_RANGE) {
1847 } else if (G_VALUE_TYPE (val) == GST_TYPE_INT64_RANGE) {
1848 return G_TYPE_INT64;
1849 } else if (G_VALUE_TYPE (val) == GST_TYPE_DOUBLE_RANGE) {
1850 return G_TYPE_DOUBLE;
1851 } else if (G_VALUE_TYPE (val) == GST_TYPE_FRACTION_RANGE) {
1852 return GST_TYPE_FRACTION;
1854 return G_VALUE_TYPE (val);
1858 priv_gst_structure_append_to_gstring (const GstStructure * structure,
1861 GstStructureField *field;
1864 g_return_val_if_fail (s != NULL, FALSE);
1866 len = GST_STRUCTURE_FIELDS (structure)->len;
1867 for (i = 0; i < len; i++) {
1871 field = GST_STRUCTURE_FIELD (structure, i);
1873 t = gst_value_serialize (&field->value);
1874 type = gst_structure_value_get_generic_type (&field->value);
1876 g_string_append_len (s, ", ", 2);
1877 /* FIXME: do we need to escape fieldnames? */
1878 g_string_append (s, g_quark_to_string (field->name));
1879 g_string_append_len (s, "=(", 2);
1880 g_string_append (s, gst_structure_to_abbr (type));
1881 g_string_append_c (s, ')');
1882 g_string_append (s, t == NULL ? "NULL" : t);
1886 g_string_append_c (s, ';');
1891 * gst_structure_to_string:
1892 * @structure: a #GstStructure
1894 * Converts @structure to a human-readable string representation.
1896 * For debugging purposes its easier to do something like this:
1898 * GST_LOG ("structure is %" GST_PTR_FORMAT, structure);
1900 * This prints the structure in human readable form.
1902 * The current implementation of serialization will lead to unexpected results
1903 * when there are nested #GstCaps / #GstStructure deeper than one level.
1905 * Free-function: g_free
1907 * Returns: (transfer full): a pointer to string allocated by g_malloc().
1908 * g_free() after usage.
1911 gst_structure_to_string (const GstStructure * structure)
1915 /* NOTE: This function is potentially called by the debug system,
1916 * so any calls to gst_log() (and GST_DEBUG(), GST_LOG(), etc.)
1917 * should be careful to avoid recursion. This includes any functions
1918 * called by gst_structure_to_string. In particular, calls should
1919 * not use the GST_PTR_FORMAT extension. */
1921 g_return_val_if_fail (structure != NULL, NULL);
1923 /* we estimate a minimum size based on the number of fields in order to
1924 * avoid unnecessary reallocs within GString */
1925 s = g_string_sized_new (STRUCTURE_ESTIMATED_STRING_LEN (structure));
1926 g_string_append (s, g_quark_to_string (structure->name));
1927 priv_gst_structure_append_to_gstring (structure, s);
1928 return g_string_free (s, FALSE);
1932 * r will still point to the string. if end == next, the string will not be
1933 * null-terminated. In all other cases it will be.
1934 * end = pointer to char behind end of string, next = pointer to start of
1936 * THIS FUNCTION MODIFIES THE STRING AND DETECTS INSIDE A NONTERMINATED STRING
1939 gst_structure_parse_string (gchar * s, gchar ** end, gchar ** next,
1950 ret = gst_structure_parse_simple_string (s, end);
1960 if (G_UNLIKELY (*s == 0))
1962 if (G_UNLIKELY (*s == '\\'))
1970 /* Find the closing quotes */
1973 if (G_UNLIKELY (*s == 0))
1975 if (G_UNLIKELY (*s == '\\'))
1990 gst_structure_parse_range (gchar * s, gchar ** after, GValue * value,
1993 GValue value1 = { 0 };
1994 GValue value2 = { 0 };
1995 GValue value3 = { 0 };
1997 gboolean ret, have_step = FALSE;
2003 ret = gst_structure_parse_value (s, &s, &value1, type);
2007 while (g_ascii_isspace (*s))
2014 while (g_ascii_isspace (*s))
2017 ret = gst_structure_parse_value (s, &s, &value2, type);
2021 while (g_ascii_isspace (*s))
2024 /* optional step for int and int64 */
2025 if (G_VALUE_TYPE (&value1) == G_TYPE_INT
2026 || G_VALUE_TYPE (&value1) == G_TYPE_INT64) {
2030 while (g_ascii_isspace (*s))
2033 ret = gst_structure_parse_value (s, &s, &value3, type);
2037 while (g_ascii_isspace (*s))
2048 if (G_VALUE_TYPE (&value1) != G_VALUE_TYPE (&value2))
2050 if (have_step && G_VALUE_TYPE (&value1) != G_VALUE_TYPE (&value3))
2053 if (G_VALUE_TYPE (&value1) == G_TYPE_DOUBLE) {
2054 range_type = GST_TYPE_DOUBLE_RANGE;
2055 g_value_init (value, range_type);
2056 gst_value_set_double_range (value,
2057 gst_g_value_get_double_unchecked (&value1),
2058 gst_g_value_get_double_unchecked (&value2));
2059 } else if (G_VALUE_TYPE (&value1) == G_TYPE_INT) {
2060 range_type = GST_TYPE_INT_RANGE;
2061 g_value_init (value, range_type);
2063 gst_value_set_int_range_step (value,
2064 gst_g_value_get_int_unchecked (&value1),
2065 gst_g_value_get_int_unchecked (&value2),
2066 gst_g_value_get_int_unchecked (&value3));
2068 gst_value_set_int_range (value, gst_g_value_get_int_unchecked (&value1),
2069 gst_g_value_get_int_unchecked (&value2));
2070 } else if (G_VALUE_TYPE (&value1) == G_TYPE_INT64) {
2071 range_type = GST_TYPE_INT64_RANGE;
2072 g_value_init (value, range_type);
2074 gst_value_set_int64_range_step (value,
2075 gst_g_value_get_int64_unchecked (&value1),
2076 gst_g_value_get_int64_unchecked (&value2),
2077 gst_g_value_get_int64_unchecked (&value3));
2079 gst_value_set_int64_range (value,
2080 gst_g_value_get_int64_unchecked (&value1),
2081 gst_g_value_get_int64_unchecked (&value2));
2082 } else if (G_VALUE_TYPE (&value1) == GST_TYPE_FRACTION) {
2083 range_type = GST_TYPE_FRACTION_RANGE;
2084 g_value_init (value, range_type);
2085 gst_value_set_fraction_range (value, &value1, &value2);
2095 gst_structure_parse_any_list (gchar * s, gchar ** after, GValue * value,
2096 GType type, GType list_type, char begin, char end)
2098 GValue list_value = { 0 };
2102 g_value_init (value, list_type);
2103 array = g_value_peek_pointer (value);
2109 while (g_ascii_isspace (*s))
2117 ret = gst_structure_parse_value (s, &s, &list_value, type);
2121 g_array_append_val (array, list_value);
2123 while (g_ascii_isspace (*s))
2131 while (g_ascii_isspace (*s))
2134 memset (&list_value, 0, sizeof (list_value));
2135 ret = gst_structure_parse_value (s, &s, &list_value, type);
2139 g_array_append_val (array, list_value);
2140 while (g_ascii_isspace (*s))
2151 gst_structure_parse_list (gchar * s, gchar ** after, GValue * value, GType type)
2153 return gst_structure_parse_any_list (s, after, value, type, GST_TYPE_LIST,
2158 gst_structure_parse_array (gchar * s, gchar ** after, GValue * value,
2161 return gst_structure_parse_any_list (s, after, value, type,
2162 GST_TYPE_ARRAY, '<', '>');
2166 gst_structure_parse_simple_string (gchar * str, gchar ** end)
2170 while (G_LIKELY (GST_ASCII_IS_STRING (*s))) {
2180 gst_structure_parse_field (gchar * str,
2181 gchar ** after, GstStructureField * field)
2190 while (g_ascii_isspace (*s) || (s[0] == '\\' && g_ascii_isspace (s[1])))
2193 if (G_UNLIKELY (!gst_structure_parse_simple_string (s, &name_end))) {
2194 GST_WARNING ("failed to parse simple string, str=%s", str);
2199 while (g_ascii_isspace (*s) || (s[0] == '\\' && g_ascii_isspace (s[1])))
2202 if (G_UNLIKELY (*s != '=')) {
2203 GST_WARNING ("missing assignment operator in the field, str=%s", str);
2210 field->name = g_quark_from_string (name);
2211 GST_DEBUG ("trying field name '%s'", name);
2214 if (G_UNLIKELY (!gst_structure_parse_value (s, &s, &field->value,
2216 GST_WARNING ("failed to parse value %s", str);
2225 gst_structure_parse_value (gchar * str,
2226 gchar ** after, GValue * value, GType default_type)
2235 GType type = default_type;
2238 while (g_ascii_isspace (*s))
2241 /* check if there's a (type_name) 'cast' */
2245 while (g_ascii_isspace (*s))
2248 if (G_UNLIKELY (!gst_structure_parse_simple_string (s, &type_end)))
2251 while (g_ascii_isspace (*s))
2253 if (G_UNLIKELY (*s != ')'))
2256 while (g_ascii_isspace (*s))
2261 type = gst_structure_gtype_from_abbr (type_name);
2262 GST_DEBUG ("trying type name '%s'", type_name);
2265 if (G_UNLIKELY (type == G_TYPE_INVALID)) {
2266 GST_WARNING ("invalid type");
2271 while (g_ascii_isspace (*s))
2274 ret = gst_structure_parse_range (s, &s, value, type);
2275 } else if (*s == '{') {
2276 ret = gst_structure_parse_list (s, &s, value, type);
2277 } else if (*s == '<') {
2278 ret = gst_structure_parse_array (s, &s, value, type);
2282 if (G_UNLIKELY (type == G_TYPE_INVALID)) {
2284 { G_TYPE_INT, G_TYPE_DOUBLE, GST_TYPE_FRACTION, G_TYPE_BOOLEAN,
2289 if (G_UNLIKELY (!gst_structure_parse_string (s, &value_end, &s, TRUE)))
2291 /* Set NULL terminator for deserialization */
2295 for (i = 0; i < G_N_ELEMENTS (try_types); i++) {
2296 g_value_init (value, try_types[i]);
2297 ret = gst_value_deserialize (value, value_s);
2300 g_value_unset (value);
2303 g_value_init (value, type);
2305 if (G_UNLIKELY (!gst_structure_parse_string (s, &value_end, &s,
2306 (type != G_TYPE_STRING))))
2308 /* Set NULL terminator for deserialization */
2312 ret = gst_value_deserialize (value, value_s);
2313 if (G_UNLIKELY (!ret))
2314 g_value_unset (value);
2325 priv_gst_structure_parse_name (gchar * str, gchar ** start, gchar ** end,
2333 /* skip spaces (FIXME: _isspace treats tabs and newlines as space!) */
2334 while (*r && (g_ascii_isspace (*r) || (r[0] == '\\'
2335 && g_ascii_isspace (r[1]))))
2340 if (G_UNLIKELY (!gst_structure_parse_string (r, &w, &r, TRUE))) {
2341 GST_WARNING ("Failed to parse structure string '%s'", str);
2352 priv_gst_structure_parse_fields (gchar * str, gchar ** end,
2353 GstStructure * structure)
2356 GstStructureField field;
2361 while (*r && (g_ascii_isspace (*r) || (r[0] == '\\'
2362 && g_ascii_isspace (r[1]))))
2365 /* end of structure, get the next char and finish */
2370 /* accept \0 as end delimiter */
2373 if (G_UNLIKELY (*r != ',')) {
2374 GST_WARNING ("Failed to find delimiter, r=%s", r);
2378 while (*r && (g_ascii_isspace (*r) || (r[0] == '\\'
2379 && g_ascii_isspace (r[1]))))
2382 memset (&field, 0, sizeof (field));
2383 if (G_UNLIKELY (!gst_structure_parse_field (r, &r, &field))) {
2384 GST_WARNING ("Failed to parse field, r=%s", r);
2387 gst_structure_set_field (structure, &field);
2396 * gst_structure_new_from_string:
2397 * @string: a string representation of a #GstStructure
2399 * Creates a #GstStructure from a string representation.
2400 * If end is not NULL, a pointer to the place inside the given string
2401 * where parsing ended will be returned.
2403 * The current implementation of serialization will lead to unexpected results
2404 * when there are nested #GstCaps / #GstStructure deeper than one level.
2406 * Free-function: gst_structure_free
2408 * Returns: (transfer full): a new #GstStructure or NULL when the string could
2409 * not be parsed. Free with gst_structure_free() after use.
2414 gst_structure_new_from_string (const gchar * string)
2416 return gst_structure_from_string (string, NULL);
2420 * gst_structure_from_string:
2421 * @string: a string representation of a #GstStructure.
2422 * @end: (out) (allow-none) (transfer none) (skip): pointer to store the end of the string in.
2424 * Creates a #GstStructure from a string representation.
2425 * If end is not NULL, a pointer to the place inside the given string
2426 * where parsing ended will be returned.
2428 * Free-function: gst_structure_free
2430 * Returns: (transfer full): a new #GstStructure or NULL when the string could
2431 * not be parsed. Free with gst_structure_free() after use.
2434 gst_structure_from_string (const gchar * string, gchar ** end)
2441 GstStructure *structure = NULL;
2443 g_return_val_if_fail (string != NULL, NULL);
2445 copy = g_strdup (string);
2448 if (!priv_gst_structure_parse_name (r, &name, &w, &r))
2453 structure = gst_structure_new_empty (name);
2456 if (G_UNLIKELY (structure == NULL))
2459 if (!priv_gst_structure_parse_fields (r, &r, structure))
2463 *end = (char *) string + (r - copy);
2465 g_warning ("gst_structure_from_string did not consume whole string,"
2466 " but caller did not provide end pointer (\"%s\")", string);
2473 gst_structure_free (structure);
2479 gst_structure_transform_to_string (const GValue * src_value,
2480 GValue * dest_value)
2482 g_return_if_fail (src_value != NULL);
2483 g_return_if_fail (dest_value != NULL);
2485 dest_value->data[0].v_pointer =
2486 gst_structure_to_string (src_value->data[0].v_pointer);
2489 static GstStructure *
2490 gst_structure_copy_conditional (const GstStructure * structure)
2493 return gst_structure_copy (structure);
2497 /* fixate utility functions */
2500 * gst_structure_fixate_field_nearest_int:
2501 * @structure: a #GstStructure
2502 * @field_name: a field in @structure
2503 * @target: the target value of the fixation
2505 * Fixates a #GstStructure by changing the given field to the nearest
2506 * integer to @target that is a subset of the existing field.
2508 * Returns: TRUE if the structure could be fixated
2511 gst_structure_fixate_field_nearest_int (GstStructure * structure,
2512 const char *field_name, int target)
2514 const GValue *value;
2516 g_return_val_if_fail (gst_structure_has_field (structure, field_name), FALSE);
2517 g_return_val_if_fail (IS_MUTABLE (structure), FALSE);
2519 value = gst_structure_get_value (structure, field_name);
2521 if (G_VALUE_TYPE (value) == G_TYPE_INT) {
2524 } else if (G_VALUE_TYPE (value) == GST_TYPE_INT_RANGE) {
2527 x = gst_value_get_int_range_min (value);
2530 x = gst_value_get_int_range_max (value);
2533 gst_structure_set (structure, field_name, G_TYPE_INT, target, NULL);
2535 } else if (G_VALUE_TYPE (value) == GST_TYPE_LIST) {
2536 const GValue *list_value;
2539 int best_index = -1;
2541 n = gst_value_list_get_size (value);
2542 for (i = 0; i < n; i++) {
2543 list_value = gst_value_list_get_value (value, i);
2544 if (G_VALUE_TYPE (list_value) == G_TYPE_INT) {
2545 int x = gst_g_value_get_int_unchecked (list_value);
2547 if (best_index == -1 || (ABS (target - x) < ABS (target - best))) {
2553 if (best_index != -1) {
2554 gst_structure_set (structure, field_name, G_TYPE_INT, best, NULL);
2564 * gst_structure_fixate_field_nearest_double:
2565 * @structure: a #GstStructure
2566 * @field_name: a field in @structure
2567 * @target: the target value of the fixation
2569 * Fixates a #GstStructure by changing the given field to the nearest
2570 * double to @target that is a subset of the existing field.
2572 * Returns: TRUE if the structure could be fixated
2575 gst_structure_fixate_field_nearest_double (GstStructure * structure,
2576 const char *field_name, double target)
2578 const GValue *value;
2580 g_return_val_if_fail (gst_structure_has_field (structure, field_name), FALSE);
2581 g_return_val_if_fail (IS_MUTABLE (structure), FALSE);
2583 value = gst_structure_get_value (structure, field_name);
2585 if (G_VALUE_TYPE (value) == G_TYPE_DOUBLE) {
2588 } else if (G_VALUE_TYPE (value) == GST_TYPE_DOUBLE_RANGE) {
2591 x = gst_value_get_double_range_min (value);
2594 x = gst_value_get_double_range_max (value);
2597 gst_structure_set (structure, field_name, G_TYPE_DOUBLE, target, NULL);
2599 } else if (G_VALUE_TYPE (value) == GST_TYPE_LIST) {
2600 const GValue *list_value;
2603 int best_index = -1;
2605 n = gst_value_list_get_size (value);
2606 for (i = 0; i < n; i++) {
2607 list_value = gst_value_list_get_value (value, i);
2608 if (G_VALUE_TYPE (list_value) == G_TYPE_DOUBLE) {
2609 double x = gst_g_value_get_double_unchecked (list_value);
2611 if (best_index == -1 || (ABS (target - x) < ABS (target - best))) {
2617 if (best_index != -1) {
2618 gst_structure_set (structure, field_name, G_TYPE_DOUBLE, best, NULL);
2629 * gst_structure_fixate_field_boolean:
2630 * @structure: a #GstStructure
2631 * @field_name: a field in @structure
2632 * @target: the target value of the fixation
2634 * Fixates a #GstStructure by changing the given @field_name field to the given
2635 * @target boolean if that field is not fixed yet.
2637 * Returns: TRUE if the structure could be fixated
2640 gst_structure_fixate_field_boolean (GstStructure * structure,
2641 const char *field_name, gboolean target)
2643 const GValue *value;
2645 g_return_val_if_fail (gst_structure_has_field (structure, field_name), FALSE);
2646 g_return_val_if_fail (IS_MUTABLE (structure), FALSE);
2648 value = gst_structure_get_value (structure, field_name);
2650 if (G_VALUE_TYPE (value) == G_TYPE_BOOLEAN) {
2653 } else if (G_VALUE_TYPE (value) == GST_TYPE_LIST) {
2654 const GValue *list_value;
2657 int best_index = -1;
2659 n = gst_value_list_get_size (value);
2660 for (i = 0; i < n; i++) {
2661 list_value = gst_value_list_get_value (value, i);
2662 if (G_VALUE_TYPE (list_value) == G_TYPE_BOOLEAN) {
2663 gboolean x = gst_g_value_get_boolean_unchecked (list_value);
2665 if (best_index == -1 || x == target) {
2671 if (best_index != -1) {
2672 gst_structure_set (structure, field_name, G_TYPE_BOOLEAN, best, NULL);
2682 * gst_structure_fixate_field_string:
2683 * @structure: a #GstStructure
2684 * @field_name: a field in @structure
2685 * @target: the target value of the fixation
2687 * Fixates a #GstStructure by changing the given @field_name field to the given
2688 * @target string if that field is not fixed yet.
2690 * Returns: TRUE if the structure could be fixated
2693 gst_structure_fixate_field_string (GstStructure * structure,
2694 const gchar * field_name, const gchar * target)
2696 const GValue *value;
2698 g_return_val_if_fail (gst_structure_has_field (structure, field_name), FALSE);
2699 g_return_val_if_fail (IS_MUTABLE (structure), FALSE);
2701 value = gst_structure_get_value (structure, field_name);
2703 if (G_VALUE_TYPE (value) == G_TYPE_STRING) {
2706 } else if (G_VALUE_TYPE (value) == GST_TYPE_LIST) {
2707 const GValue *list_value;
2709 const gchar *best = NULL;
2710 int best_index = -1;
2712 n = gst_value_list_get_size (value);
2713 for (i = 0; i < n; i++) {
2714 list_value = gst_value_list_get_value (value, i);
2715 if (G_VALUE_TYPE (list_value) == G_TYPE_STRING) {
2716 const gchar *x = g_value_get_string (list_value);
2718 if (best_index == -1 || g_str_equal (x, target)) {
2724 if (best_index != -1) {
2725 gst_structure_set (structure, field_name, G_TYPE_STRING, best, NULL);
2735 * gst_structure_fixate_field_nearest_fraction:
2736 * @structure: a #GstStructure
2737 * @field_name: a field in @structure
2738 * @target_numerator: The numerator of the target value of the fixation
2739 * @target_denominator: The denominator of the target value of the fixation
2741 * Fixates a #GstStructure by changing the given field to the nearest
2742 * fraction to @target_numerator/@target_denominator that is a subset
2743 * of the existing field.
2745 * Returns: TRUE if the structure could be fixated
2748 gst_structure_fixate_field_nearest_fraction (GstStructure * structure,
2749 const char *field_name, const gint target_numerator,
2750 const gint target_denominator)
2752 const GValue *value;
2754 g_return_val_if_fail (gst_structure_has_field (structure, field_name), FALSE);
2755 g_return_val_if_fail (IS_MUTABLE (structure), FALSE);
2757 value = gst_structure_get_value (structure, field_name);
2759 if (G_VALUE_TYPE (value) == GST_TYPE_FRACTION) {
2762 } else if (G_VALUE_TYPE (value) == GST_TYPE_FRACTION_RANGE) {
2763 const GValue *x, *new_value;
2764 GValue target = { 0 };
2765 g_value_init (&target, GST_TYPE_FRACTION);
2766 gst_value_set_fraction (&target, target_numerator, target_denominator);
2768 new_value = ⌖
2769 x = gst_value_get_fraction_range_min (value);
2770 if (gst_value_compare (&target, x) == GST_VALUE_LESS_THAN)
2772 x = gst_value_get_fraction_range_max (value);
2773 if (gst_value_compare (&target, x) == GST_VALUE_GREATER_THAN)
2776 gst_structure_set_value (structure, field_name, new_value);
2777 g_value_unset (&target);
2779 } else if (G_VALUE_TYPE (value) == GST_TYPE_LIST) {
2780 const GValue *list_value;
2782 const GValue *best = NULL;
2785 gdouble best_diff = G_MAXDOUBLE;
2787 target = (gdouble) target_numerator / (gdouble) target_denominator;
2789 GST_DEBUG ("target %g, best %g", target, best_diff);
2793 n = gst_value_list_get_size (value);
2794 for (i = 0; i < n; i++) {
2795 list_value = gst_value_list_get_value (value, i);
2796 if (G_VALUE_TYPE (list_value) == GST_TYPE_FRACTION) {
2798 gdouble list_double;
2800 num = gst_value_get_fraction_numerator (list_value);
2801 denom = gst_value_get_fraction_denominator (list_value);
2803 list_double = ((gdouble) num / (gdouble) denom);
2804 cur_diff = target - list_double;
2806 GST_DEBUG ("curr diff %g, list %g", cur_diff, list_double);
2809 cur_diff = -cur_diff;
2811 if (!best || cur_diff < best_diff) {
2812 GST_DEBUG ("new best %g", list_double);
2814 best_diff = cur_diff;
2819 gst_structure_set_value (structure, field_name, best);
2828 default_fixate (GQuark field_id, const GValue * value, gpointer data)
2830 GstStructure *s = data;
2833 if (gst_value_fixate (&v, value)) {
2834 gst_structure_id_take_value (s, field_id, &v);
2840 * gst_structure_fixate_field:
2841 * @structure: a #GstStructure
2842 * @field_name: a field in @structure
2844 * Fixates a #GstStructure by changing the given field with its fixated value.
2846 * Returns: TRUE if the structure field could be fixated
2849 gst_structure_fixate_field (GstStructure * structure, const char *field_name)
2851 GstStructureField *field;
2853 g_return_val_if_fail (structure != NULL, FALSE);
2854 g_return_val_if_fail (IS_MUTABLE (structure), FALSE);
2856 if (!(field = gst_structure_get_field (structure, field_name)))
2859 return default_fixate (field->name, &field->value, structure);
2862 /* our very own version of G_VALUE_LCOPY that allows NULL return locations
2863 * (useful for message parsing functions where the return location is user
2864 * supplied and the user may pass NULL if the value isn't of interest) */
2865 #define GST_VALUE_LCOPY(value, var_args, flags, __error, fieldname) \
2867 const GValue *_value = (value); \
2868 guint _flags = (flags); \
2869 GType _value_type = G_VALUE_TYPE (_value); \
2870 GTypeValueTable *_vtable = g_type_value_table_peek (_value_type); \
2871 const gchar *_lcopy_format = _vtable->lcopy_format; \
2872 GTypeCValue _cvalues[G_VALUE_COLLECT_FORMAT_MAX_LENGTH] = { { 0, }, }; \
2873 guint _n_values = 0; \
2875 while (*_lcopy_format != '\0') { \
2876 g_assert (*_lcopy_format == G_VALUE_COLLECT_POINTER); \
2877 _cvalues[_n_values++].v_pointer = va_arg ((var_args), gpointer); \
2880 if (_n_values == 2 && !!_cvalues[0].v_pointer != !!_cvalues[1].v_pointer) { \
2881 *(__error) = g_strdup_printf ("either all or none of the return " \
2882 "locations for field '%s' need to be NULL", fieldname); \
2883 } else if (_cvalues[0].v_pointer != NULL) { \
2884 *(__error) = _vtable->lcopy_value (_value, _n_values, _cvalues, _flags); \
2889 * gst_structure_get_valist:
2890 * @structure: a #GstStructure
2891 * @first_fieldname: the name of the first field to read
2892 * @args: variable arguments
2894 * Parses the variable arguments and reads fields from @structure accordingly.
2895 * valist-variant of gst_structure_get(). Look at the documentation of
2896 * gst_structure_get() for more details.
2898 * Returns: TRUE, or FALSE if there was a problem reading any of the fields
2901 gst_structure_get_valist (const GstStructure * structure,
2902 const char *first_fieldname, va_list args)
2904 const char *field_name;
2905 GType expected_type = G_TYPE_INVALID;
2907 g_return_val_if_fail (GST_IS_STRUCTURE (structure), FALSE);
2908 g_return_val_if_fail (first_fieldname != NULL, FALSE);
2910 field_name = first_fieldname;
2911 while (field_name) {
2912 const GValue *val = NULL;
2915 expected_type = va_arg (args, GType);
2917 val = gst_structure_get_value (structure, field_name);
2922 if (G_VALUE_TYPE (val) != expected_type)
2925 GST_VALUE_LCOPY (val, args, 0, &err, field_name);
2927 g_warning ("%s: %s", G_STRFUNC, err);
2932 field_name = va_arg (args, const gchar *);
2940 GST_INFO ("Expected field '%s' in structure: %" GST_PTR_FORMAT,
2941 field_name, structure);
2946 GST_INFO ("Expected field '%s' in structure to be of type '%s', but "
2947 "field was of type '%s': %" GST_PTR_FORMAT, field_name,
2948 GST_STR_NULL (g_type_name (expected_type)),
2949 G_VALUE_TYPE_NAME (gst_structure_get_value (structure, field_name)),
2956 * gst_structure_id_get_valist:
2957 * @structure: a #GstStructure
2958 * @first_field_id: the quark of the first field to read
2959 * @args: variable arguments
2961 * Parses the variable arguments and reads fields from @structure accordingly.
2962 * valist-variant of gst_structure_id_get(). Look at the documentation of
2963 * gst_structure_id_get() for more details.
2965 * Returns: TRUE, or FALSE if there was a problem reading any of the fields
2968 gst_structure_id_get_valist (const GstStructure * structure,
2969 GQuark first_field_id, va_list args)
2972 GType expected_type = G_TYPE_INVALID;
2974 g_return_val_if_fail (GST_IS_STRUCTURE (structure), FALSE);
2975 g_return_val_if_fail (first_field_id != 0, FALSE);
2977 field_id = first_field_id;
2979 const GValue *val = NULL;
2982 expected_type = va_arg (args, GType);
2984 val = gst_structure_id_get_value (structure, field_id);
2989 if (G_VALUE_TYPE (val) != expected_type)
2992 GST_VALUE_LCOPY (val, args, 0, &err, g_quark_to_string (field_id));
2994 g_warning ("%s: %s", G_STRFUNC, err);
2999 field_id = va_arg (args, GQuark);
3007 GST_DEBUG ("Expected field '%s' in structure: %" GST_PTR_FORMAT,
3008 GST_STR_NULL (g_quark_to_string (field_id)), structure);
3013 GST_DEBUG ("Expected field '%s' in structure to be of type '%s', but "
3014 "field was of type '%s': %" GST_PTR_FORMAT,
3015 g_quark_to_string (field_id),
3016 GST_STR_NULL (g_type_name (expected_type)),
3017 G_VALUE_TYPE_NAME (gst_structure_id_get_value (structure, field_id)),
3024 * gst_structure_get:
3025 * @structure: a #GstStructure
3026 * @first_fieldname: the name of the first field to read
3027 * @...: variable arguments
3029 * Parses the variable arguments and reads fields from @structure accordingly.
3030 * Variable arguments should be in the form field name, field type
3031 * (as a GType), pointer(s) to a variable(s) to hold the return value(s).
3032 * The last variable argument should be NULL.
3034 * For refcounted (mini)objects you will receive a new reference which
3035 * you must release with a suitable _unref() when no longer needed. For
3036 * strings and boxed types you will receive a copy which you will need to
3037 * release with either g_free() or the suitable function for the boxed type.
3039 * Returns: FALSE if there was a problem reading any of the fields (e.g.
3040 * because the field requested did not exist, or was of a type other
3041 * than the type specified), otherwise TRUE.
3044 gst_structure_get (const GstStructure * structure, const char *first_fieldname,
3050 g_return_val_if_fail (GST_IS_STRUCTURE (structure), FALSE);
3051 g_return_val_if_fail (first_fieldname != NULL, FALSE);
3053 va_start (args, first_fieldname);
3054 ret = gst_structure_get_valist (structure, first_fieldname, args);
3061 * gst_structure_id_get:
3062 * @structure: a #GstStructure
3063 * @first_field_id: the quark of the first field to read
3064 * @...: variable arguments
3066 * Parses the variable arguments and reads fields from @structure accordingly.
3067 * Variable arguments should be in the form field id quark, field type
3068 * (as a GType), pointer(s) to a variable(s) to hold the return value(s).
3069 * The last variable argument should be NULL (technically it should be a
3070 * 0 quark, but we require NULL so compilers that support it can check for
3071 * the NULL terminator and warn if it's not there).
3073 * This function is just like gst_structure_get() only that it is slightly
3074 * more efficient since it saves the string-to-quark lookup in the global
3077 * For refcounted (mini)objects you will receive a new reference which
3078 * you must release with a suitable _unref() when no longer needed. For
3079 * strings and boxed types you will receive a copy which you will need to
3080 * release with either g_free() or the suitable function for the boxed type.
3082 * Returns: FALSE if there was a problem reading any of the fields (e.g.
3083 * because the field requested did not exist, or was of a type other
3084 * than the type specified), otherwise TRUE.
3087 gst_structure_id_get (const GstStructure * structure, GQuark first_field_id,
3093 g_return_val_if_fail (GST_IS_STRUCTURE (structure), FALSE);
3094 g_return_val_if_fail (first_field_id != 0, FALSE);
3096 va_start (args, first_field_id);
3097 ret = gst_structure_id_get_valist (structure, first_field_id, args);
3104 gst_structure_is_equal_foreach (GQuark field_id, const GValue * val2,
3107 const GstStructure *struct1 = (const GstStructure *) data;
3108 const GValue *val1 = gst_structure_id_get_value (struct1, field_id);
3110 if (G_UNLIKELY (val1 == NULL))
3112 if (gst_value_compare (val1, val2) == GST_VALUE_EQUAL) {
3120 * gst_structure_is_equal:
3121 * @structure1: a #GstStructure.
3122 * @structure2: a #GstStructure.
3124 * Tests if the two #GstStructure are equal.
3126 * Returns: TRUE if the two structures have the same name and field.
3129 gst_structure_is_equal (const GstStructure * structure1,
3130 const GstStructure * structure2)
3132 g_return_val_if_fail (GST_IS_STRUCTURE (structure1), FALSE);
3133 g_return_val_if_fail (GST_IS_STRUCTURE (structure2), FALSE);
3135 if (G_UNLIKELY (structure1 == structure2))
3138 if (structure1->name != structure2->name) {
3141 if (GST_STRUCTURE_FIELDS (structure1)->len !=
3142 GST_STRUCTURE_FIELDS (structure2)->len) {
3146 return gst_structure_foreach (structure1, gst_structure_is_equal_foreach,
3147 (gpointer) structure2);
3154 const GstStructure *intersect;
3159 gst_structure_intersect_field1 (GQuark id, const GValue * val1, gpointer data)
3161 IntersectData *idata = (IntersectData *) data;
3162 const GValue *val2 = gst_structure_id_get_value (idata->intersect, id);
3164 if (G_UNLIKELY (val2 == NULL)) {
3165 gst_structure_id_set_value (idata->dest, id, val1);
3167 GValue dest_value = { 0 };
3168 if (gst_value_intersect (&dest_value, val1, val2)) {
3169 gst_structure_id_take_value (idata->dest, id, &dest_value);
3178 gst_structure_intersect_field2 (GQuark id, const GValue * val1, gpointer data)
3180 IntersectData *idata = (IntersectData *) data;
3181 const GValue *val2 = gst_structure_id_get_value (idata->intersect, id);
3183 if (G_UNLIKELY (val2 == NULL)) {
3184 gst_structure_id_set_value (idata->dest, id, val1);
3190 * gst_structure_intersect:
3191 * @struct1: a #GstStructure
3192 * @struct2: a #GstStructure
3194 * Intersects @struct1 and @struct2 and returns the intersection.
3196 * Returns: Intersection of @struct1 and @struct2
3199 gst_structure_intersect (const GstStructure * struct1,
3200 const GstStructure * struct2)
3204 g_assert (struct1 != NULL);
3205 g_assert (struct2 != NULL);
3207 if (G_UNLIKELY (struct1->name != struct2->name))
3210 /* copy fields from struct1 which we have not in struct2 to target
3211 * intersect if we have the field in both */
3212 data.dest = gst_structure_new_id_empty (struct1->name);
3213 data.intersect = struct2;
3214 if (G_UNLIKELY (!gst_structure_foreach ((GstStructure *) struct1,
3215 gst_structure_intersect_field1, &data)))
3218 /* copy fields from struct2 which we have not in struct1 to target */
3219 data.intersect = struct1;
3220 if (G_UNLIKELY (!gst_structure_foreach ((GstStructure *) struct2,
3221 gst_structure_intersect_field2, &data)))
3227 gst_structure_free (data.dest);
3232 gst_caps_structure_can_intersect_field (GQuark id, const GValue * val1,
3235 GstStructure *other = (GstStructure *) data;
3236 const GValue *val2 = gst_structure_id_get_value (other, id);
3238 if (G_LIKELY (val2)) {
3239 if (!gst_value_can_intersect (val1, val2)) {
3242 gint eq = gst_value_compare (val1, val2);
3244 if (eq == GST_VALUE_UNORDERED) {
3245 /* we need to try interseting */
3246 if (!gst_value_intersect (NULL, val1, val2)) {
3249 } else if (eq != GST_VALUE_EQUAL) {
3258 * gst_structure_can_intersect:
3259 * @struct1: a #GstStructure
3260 * @struct2: a #GstStructure
3262 * Tries intersecting @struct1 and @struct2 and reports whether the result
3263 * would not be empty.
3265 * Returns: %TRUE if intersection would not be empty
3268 gst_structure_can_intersect (const GstStructure * struct1,
3269 const GstStructure * struct2)
3271 g_return_val_if_fail (GST_IS_STRUCTURE (struct1), FALSE);
3272 g_return_val_if_fail (GST_IS_STRUCTURE (struct2), FALSE);
3274 if (G_UNLIKELY (struct1->name != struct2->name))
3277 /* tries to intersect if we have the field in both */
3278 return gst_structure_foreach ((GstStructure *) struct1,
3279 gst_caps_structure_can_intersect_field, (gpointer) struct2);
3283 gst_caps_structure_is_superset_field (GQuark field_id, const GValue * value,
3286 GstStructure *subset = user_data;
3287 const GValue *other;
3290 if (!(other = gst_structure_id_get_value (subset, field_id)))
3291 /* field is missing in the subset => no subset */
3294 comparison = gst_value_compare (value, other);
3296 /* equal values are subset */
3297 if (comparison == GST_VALUE_EQUAL)
3300 /* ordered, but unequal, values are not */
3301 if (comparison != GST_VALUE_UNORDERED)
3304 return gst_value_is_subset (other, value);
3308 * gst_structure_is_subset:
3309 * @subset: a #GstStructure
3310 * @superset: a potentially greater #GstStructure
3312 * Checks if @subset is a subset of @superset, i.e. has the same
3313 * structure name and for all fields that are existing in @superset,
3314 * @subset has a value that is a subset of the value in @superset.
3316 * Returns: %TRUE if @subset is a subset of @superset
3319 gst_structure_is_subset (const GstStructure * subset,
3320 const GstStructure * superset)
3322 if ((superset->name != subset->name) ||
3323 (gst_structure_n_fields (superset) > gst_structure_n_fields (subset)))
3326 return gst_structure_foreach ((GstStructure *) superset,
3327 gst_caps_structure_is_superset_field, (gpointer) subset);
3332 * gst_structure_fixate:
3333 * @structure: a #GstStructure
3335 * Fixate all values in @structure using gst_value_fixate().
3336 * @structure will be modified in-place and should be writable.
3339 gst_structure_fixate (GstStructure * structure)
3341 g_return_if_fail (GST_IS_STRUCTURE (structure));
3343 gst_structure_foreach (structure, default_fixate, structure);