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 * @title: GstStructure
25 * @short_description: Generic structure containing fields of names and values
26 * @see_also: #GstCaps, #GstMessage, #GstEvent, #GstQuery
28 * A #GstStructure is a collection of key/value pairs. The keys are expressed
29 * as GQuarks and the values can be of any GType.
31 * In addition to the key/value pairs, a #GstStructure also has a name. The name
32 * starts with a letter and can be filled by letters, numbers and any of "/-_.:".
34 * #GstStructure is used by various GStreamer subsystems to store information
35 * in a flexible and extensible way. A #GstStructure does not have a refcount
36 * because it usually is part of a higher level object such as #GstCaps,
37 * #GstMessage, #GstEvent, #GstQuery. It provides a means to enforce mutability
38 * using the refcount of the parent with the gst_structure_set_parent_refcount()
41 * A #GstStructure can be created with gst_structure_new_empty() or
42 * gst_structure_new(), which both take a name and an optional set of
43 * key/value pairs along with the types of the values.
45 * Field values can be changed with gst_structure_set_value() or
46 * gst_structure_set().
48 * Field values can be retrieved with gst_structure_get_value() or the more
49 * convenient gst_structure_get_*() functions.
51 * Fields can be removed with gst_structure_remove_field() or
52 * gst_structure_remove_fields().
54 * Strings in structures must be ASCII or UTF-8 encoded. Other encodings are
55 * not allowed. Strings may be %NULL however.
57 * Be aware that the current #GstCaps / #GstStructure serialization into string
58 * has limited support for nested #GstCaps / #GstStructure fields. It can only
59 * support one level of nesting. Using more levels will lead to unexpected
60 * behavior when using serialization features, such as gst_caps_to_string() or
61 * gst_value_serialize() and their counterparts.
68 /* FIXME 2.0: suppress warnings for deprecated API such as GValueArray
69 * with newer GLib versions (>= 2.31.0) */
70 #define GLIB_DISABLE_DEPRECATION_WARNINGS
74 #include "gst_private.h"
77 #include <gobject/gvaluecollector.h>
79 GST_DEBUG_CATEGORY_STATIC (gst_structure_debug);
80 #define GST_CAT_DEFAULT gst_structure_debug
82 typedef struct _GstStructureField GstStructureField;
84 struct _GstStructureField
94 /* owned by parent structure, NULL if no parent */
95 gint *parent_refcount;
100 #define GST_STRUCTURE_REFCOUNT(s) (((GstStructureImpl*)(s))->parent_refcount)
101 #define GST_STRUCTURE_FIELDS(s) (((GstStructureImpl*)(s))->fields)
103 #define GST_STRUCTURE_FIELD(structure, index) \
104 &g_array_index(GST_STRUCTURE_FIELDS(structure), GstStructureField, (index))
106 #define IS_MUTABLE(structure) \
107 (!GST_STRUCTURE_REFCOUNT(structure) || \
108 g_atomic_int_get (GST_STRUCTURE_REFCOUNT(structure)) == 1)
110 #define IS_TAGLIST(structure) \
111 (structure->name == GST_QUARK (TAGLIST))
113 static void gst_structure_set_field (GstStructure * structure,
114 GstStructureField * field);
115 static GstStructureField *gst_structure_get_field (const GstStructure *
116 structure, const gchar * fieldname);
117 static GstStructureField *gst_structure_id_get_field (const GstStructure *
118 structure, GQuark field);
119 static void gst_structure_transform_to_string (const GValue * src_value,
120 GValue * dest_value);
121 static GstStructure *gst_structure_copy_conditional (const GstStructure *
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. Fields that
625 * weren't already part of the structure are added as needed.
626 * Variable arguments should be in the form field name, field type
627 * (as a GType), value(s). The last variable argument should be %NULL.
630 gst_structure_set (GstStructure * structure, const gchar * field, ...)
634 g_return_if_fail (structure != NULL);
635 g_return_if_fail (IS_MUTABLE (structure) || field == NULL);
637 va_start (varargs, field);
638 gst_structure_set_valist_internal (structure, field, varargs);
643 * gst_structure_set_valist:
644 * @structure: a #GstStructure
645 * @fieldname: the name of the field to set
646 * @varargs: variable arguments
648 * va_list form of gst_structure_set().
651 gst_structure_set_valist (GstStructure * structure,
652 const gchar * fieldname, va_list varargs)
654 g_return_if_fail (structure != NULL);
655 g_return_if_fail (IS_MUTABLE (structure));
657 gst_structure_set_valist_internal (structure, fieldname, varargs);
661 gst_structure_id_set_valist_internal (GstStructure * structure,
662 GQuark fieldname, va_list varargs)
668 GstStructureField field = { 0 };
670 field.name = fieldname;
671 type = va_arg (varargs, GType);
673 G_VALUE_COLLECT_INIT (&field.value, type, varargs, 0, &err);
674 if (G_UNLIKELY (err)) {
675 g_critical ("%s", err);
678 gst_structure_set_field (structure, &field);
680 fieldname = va_arg (varargs, GQuark);
685 * gst_structure_id_set:
686 * @structure: a #GstStructure
687 * @fieldname: the GQuark for the name of the field to set
688 * @...: variable arguments
690 * Identical to gst_structure_set, except that field names are
691 * passed using the GQuark for the field name. This allows more efficient
692 * setting of the structure if the caller already knows the associated
694 * The last variable argument must be %NULL.
697 gst_structure_id_set (GstStructure * structure, GQuark field, ...)
701 g_return_if_fail (structure != NULL);
703 va_start (varargs, field);
704 gst_structure_id_set_valist_internal (structure, field, varargs);
709 * gst_structure_id_set_valist:
710 * @structure: a #GstStructure
711 * @fieldname: the name of the field to set
712 * @varargs: variable arguments
714 * va_list form of gst_structure_id_set().
717 gst_structure_id_set_valist (GstStructure * structure,
718 GQuark fieldname, va_list varargs)
720 g_return_if_fail (structure != NULL);
721 g_return_if_fail (IS_MUTABLE (structure));
723 gst_structure_id_set_valist_internal (structure, fieldname, varargs);
727 * gst_structure_new_id:
728 * @name_quark: name of new structure
729 * @field_quark: the GQuark for the name of the field to set
730 * @...: variable arguments
732 * Creates a new #GstStructure with the given name as a GQuark, followed by
733 * fieldname quark, GType, argument(s) "triplets" in the same format as
734 * gst_structure_id_set(). Basically a convenience wrapper around
735 * gst_structure_new_id_empty() and gst_structure_id_set().
737 * The last variable argument must be %NULL (or 0).
739 * Free-function: gst_structure_free
741 * Returns: (transfer full): a new #GstStructure
744 gst_structure_new_id (GQuark name_quark, GQuark field_quark, ...)
749 g_return_val_if_fail (name_quark != 0, NULL);
750 g_return_val_if_fail (field_quark != 0, NULL);
752 s = gst_structure_new_id_empty (name_quark);
754 va_start (varargs, field_quark);
755 gst_structure_id_set_valist_internal (s, field_quark, varargs);
761 #if GST_VERSION_NANO == 1
762 #define GIT_G_WARNING g_warning
764 #define GIT_G_WARNING GST_WARNING
767 /* If the structure currently contains a field with the same name, it is
768 * replaced with the provided field. Otherwise, the field is added to the
769 * structure. The field's value is not deeply copied.
772 gst_structure_set_field (GstStructure * structure, GstStructureField * field)
774 GstStructureField *f;
775 GType field_value_type;
778 len = GST_STRUCTURE_FIELDS (structure)->len;
780 field_value_type = G_VALUE_TYPE (&field->value);
781 if (field_value_type == G_TYPE_STRING) {
784 s = g_value_get_string (&field->value);
785 /* only check for NULL strings in taglists, as they are allowed in message
786 * structs, e.g. error message debug strings */
787 if (G_UNLIKELY (IS_TAGLIST (structure) && (s == NULL || *s == '\0'))) {
789 GIT_G_WARNING ("Trying to set NULL string on field '%s' on taglist. "
790 "Please file a bug.", g_quark_to_string (field->name));
791 g_value_unset (&field->value);
794 /* empty strings never make sense */
795 GIT_G_WARNING ("Trying to set empty string on taglist field '%s'. "
796 "Please file a bug.", g_quark_to_string (field->name));
797 g_value_unset (&field->value);
800 } else if (G_UNLIKELY (s != NULL && !g_utf8_validate (s, -1, NULL))) {
801 g_warning ("Trying to set string on %s field '%s', but string is not "
802 "valid UTF-8. Please file a bug.",
803 IS_TAGLIST (structure) ? "taglist" : "structure",
804 g_quark_to_string (field->name));
805 g_value_unset (&field->value);
808 } else if (G_UNLIKELY (field_value_type == G_TYPE_DATE)) {
811 d = g_value_get_boxed (&field->value);
812 /* only check for NULL GDates in taglists, as they might make sense
813 * in other, generic structs */
814 if (G_UNLIKELY ((IS_TAGLIST (structure) && d == NULL))) {
815 GIT_G_WARNING ("Trying to set NULL GDate on field '%s' on taglist. "
816 "Please file a bug.", g_quark_to_string (field->name));
817 g_value_unset (&field->value);
819 } else if (G_UNLIKELY (d != NULL && !g_date_valid (d))) {
821 ("Trying to set invalid GDate on %s field '%s'. Please file a bug.",
822 IS_TAGLIST (structure) ? "taglist" : "structure",
823 g_quark_to_string (field->name));
824 g_value_unset (&field->value);
829 for (i = 0; i < len; i++) {
830 f = GST_STRUCTURE_FIELD (structure, i);
832 if (G_UNLIKELY (f->name == field->name)) {
833 g_value_unset (&f->value);
834 memcpy (f, field, sizeof (GstStructureField));
839 g_array_append_val (GST_STRUCTURE_FIELDS (structure), *field);
842 /* If there is no field with the given ID, NULL is returned.
844 static GstStructureField *
845 gst_structure_id_get_field (const GstStructure * structure, GQuark field_id)
847 GstStructureField *field;
850 len = GST_STRUCTURE_FIELDS (structure)->len;
852 for (i = 0; i < len; i++) {
853 field = GST_STRUCTURE_FIELD (structure, i);
855 if (G_UNLIKELY (field->name == field_id))
862 /* If there is no field with the given ID, NULL is returned.
864 static GstStructureField *
865 gst_structure_get_field (const GstStructure * structure,
866 const gchar * fieldname)
868 g_return_val_if_fail (structure != NULL, NULL);
869 g_return_val_if_fail (fieldname != NULL, NULL);
871 return gst_structure_id_get_field (structure,
872 g_quark_from_string (fieldname));
876 * gst_structure_get_value:
877 * @structure: a #GstStructure
878 * @fieldname: the name of the field to get
880 * Get the value of the field with name @fieldname.
882 * Returns: the #GValue corresponding to the field with the given name.
885 gst_structure_get_value (const GstStructure * structure,
886 const gchar * fieldname)
888 GstStructureField *field;
890 g_return_val_if_fail (structure != NULL, NULL);
891 g_return_val_if_fail (fieldname != NULL, NULL);
893 field = gst_structure_get_field (structure, fieldname);
897 return &field->value;
901 * gst_structure_id_get_value:
902 * @structure: a #GstStructure
903 * @field: the #GQuark of the field to get
905 * Get the value of the field with GQuark @field.
907 * Returns: the #GValue corresponding to the field with the given name
911 gst_structure_id_get_value (const GstStructure * structure, GQuark field)
913 GstStructureField *gsfield;
915 g_return_val_if_fail (structure != NULL, NULL);
917 gsfield = gst_structure_id_get_field (structure, field);
921 return &gsfield->value;
925 * gst_structure_remove_field:
926 * @structure: a #GstStructure
927 * @fieldname: the name of the field to remove
929 * Removes the field with the given name. If the field with the given
930 * name does not exist, the structure is unchanged.
933 gst_structure_remove_field (GstStructure * structure, const gchar * fieldname)
935 GstStructureField *field;
939 g_return_if_fail (structure != NULL);
940 g_return_if_fail (fieldname != NULL);
941 g_return_if_fail (IS_MUTABLE (structure));
943 id = g_quark_from_string (fieldname);
944 len = GST_STRUCTURE_FIELDS (structure)->len;
946 for (i = 0; i < len; i++) {
947 field = GST_STRUCTURE_FIELD (structure, i);
949 if (field->name == id) {
950 if (G_IS_VALUE (&field->value)) {
951 g_value_unset (&field->value);
953 GST_STRUCTURE_FIELDS (structure) =
954 g_array_remove_index (GST_STRUCTURE_FIELDS (structure), i);
961 * gst_structure_remove_fields:
962 * @structure: a #GstStructure
963 * @fieldname: the name of the field to remove
964 * @...: %NULL-terminated list of more fieldnames to remove
966 * Removes the fields with the given names. If a field does not exist, the
967 * argument is ignored.
970 gst_structure_remove_fields (GstStructure * structure,
971 const gchar * fieldname, ...)
975 g_return_if_fail (structure != NULL);
976 g_return_if_fail (fieldname != NULL);
977 /* mutability checked in remove_field */
979 va_start (varargs, fieldname);
980 gst_structure_remove_fields_valist (structure, fieldname, varargs);
985 * gst_structure_remove_fields_valist:
986 * @structure: a #GstStructure
987 * @fieldname: the name of the field to remove
988 * @varargs: %NULL-terminated list of more fieldnames to remove
990 * va_list form of gst_structure_remove_fields().
993 gst_structure_remove_fields_valist (GstStructure * structure,
994 const gchar * fieldname, va_list varargs)
996 gchar *field = (gchar *) fieldname;
998 g_return_if_fail (structure != NULL);
999 g_return_if_fail (fieldname != NULL);
1000 /* mutability checked in remove_field */
1003 gst_structure_remove_field (structure, field);
1004 field = va_arg (varargs, char *);
1009 * gst_structure_remove_all_fields:
1010 * @structure: a #GstStructure
1012 * Removes all fields in a GstStructure.
1015 gst_structure_remove_all_fields (GstStructure * structure)
1017 GstStructureField *field;
1020 g_return_if_fail (structure != NULL);
1021 g_return_if_fail (IS_MUTABLE (structure));
1023 for (i = GST_STRUCTURE_FIELDS (structure)->len - 1; i >= 0; i--) {
1024 field = GST_STRUCTURE_FIELD (structure, i);
1026 if (G_IS_VALUE (&field->value)) {
1027 g_value_unset (&field->value);
1029 GST_STRUCTURE_FIELDS (structure) =
1030 g_array_remove_index (GST_STRUCTURE_FIELDS (structure), i);
1035 * gst_structure_get_field_type:
1036 * @structure: a #GstStructure
1037 * @fieldname: the name of the field
1039 * Finds the field with the given name, and returns the type of the
1040 * value it contains. If the field is not found, G_TYPE_INVALID is
1043 * Returns: the #GValue of the field
1046 gst_structure_get_field_type (const GstStructure * structure,
1047 const gchar * fieldname)
1049 GstStructureField *field;
1051 g_return_val_if_fail (structure != NULL, G_TYPE_INVALID);
1052 g_return_val_if_fail (fieldname != NULL, G_TYPE_INVALID);
1054 field = gst_structure_get_field (structure, fieldname);
1056 return G_TYPE_INVALID;
1058 return G_VALUE_TYPE (&field->value);
1062 * gst_structure_n_fields:
1063 * @structure: a #GstStructure
1065 * Get the number of fields in the structure.
1067 * Returns: the number of fields in the structure
1070 gst_structure_n_fields (const GstStructure * structure)
1072 g_return_val_if_fail (structure != NULL, 0);
1074 return GST_STRUCTURE_FIELDS (structure)->len;
1078 * gst_structure_nth_field_name:
1079 * @structure: a #GstStructure
1080 * @index: the index to get the name of
1082 * Get the name of the given field number, counting from 0 onwards.
1084 * Returns: the name of the given field number
1087 gst_structure_nth_field_name (const GstStructure * structure, guint index)
1089 GstStructureField *field;
1091 g_return_val_if_fail (structure != NULL, NULL);
1092 g_return_val_if_fail (index < GST_STRUCTURE_FIELDS (structure)->len, NULL);
1094 field = GST_STRUCTURE_FIELD (structure, index);
1096 return g_quark_to_string (field->name);
1100 * gst_structure_foreach:
1101 * @structure: a #GstStructure
1102 * @func: (scope call): a function to call for each field
1103 * @user_data: (closure): private data
1105 * Calls the provided function once for each field in the #GstStructure. The
1106 * function must not modify the fields. Also see gst_structure_map_in_place()
1107 * and gst_structure_filter_and_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_filter_and_map_in_place:
1175 * @structure: a #GstStructure
1176 * @func: (scope call): a function to call for each field
1177 * @user_data: (closure): private data
1179 * Calls the provided function once for each field in the #GstStructure. In
1180 * contrast to gst_structure_foreach(), the function may modify the fields.
1181 * In contrast to gst_structure_map_in_place(), the field is removed from
1182 * the structure if %FALSE is returned from the function.
1183 * The structure must be mutable.
1188 gst_structure_filter_and_map_in_place (GstStructure * structure,
1189 GstStructureFilterMapFunc func, gpointer user_data)
1192 GstStructureField *field;
1195 g_return_if_fail (structure != NULL);
1196 g_return_if_fail (IS_MUTABLE (structure));
1197 g_return_if_fail (func != NULL);
1198 len = GST_STRUCTURE_FIELDS (structure)->len;
1200 for (i = 0; i < len;) {
1201 field = GST_STRUCTURE_FIELD (structure, i);
1203 ret = func (field->name, &field->value, user_data);
1206 if (G_IS_VALUE (&field->value)) {
1207 g_value_unset (&field->value);
1209 GST_STRUCTURE_FIELDS (structure) =
1210 g_array_remove_index (GST_STRUCTURE_FIELDS (structure), i);
1211 len = GST_STRUCTURE_FIELDS (structure)->len;
1219 * gst_structure_id_has_field:
1220 * @structure: a #GstStructure
1221 * @field: #GQuark of the field name
1223 * Check if @structure contains a field named @field.
1225 * Returns: %TRUE if the structure contains a field with the given name
1228 gst_structure_id_has_field (const GstStructure * structure, GQuark field)
1230 GstStructureField *f;
1232 g_return_val_if_fail (structure != NULL, FALSE);
1233 g_return_val_if_fail (field != 0, FALSE);
1235 f = gst_structure_id_get_field (structure, field);
1241 * gst_structure_has_field:
1242 * @structure: a #GstStructure
1243 * @fieldname: the name of a field
1245 * Check if @structure contains a field named @fieldname.
1247 * Returns: %TRUE if the structure contains a field with the given name
1250 gst_structure_has_field (const GstStructure * structure,
1251 const gchar * fieldname)
1253 g_return_val_if_fail (structure != NULL, FALSE);
1254 g_return_val_if_fail (fieldname != NULL, FALSE);
1256 return gst_structure_id_has_field (structure,
1257 g_quark_from_string (fieldname));
1261 * gst_structure_id_has_field_typed:
1262 * @structure: a #GstStructure
1263 * @field: #GQuark of the field name
1264 * @type: the type of a value
1266 * Check if @structure contains a field named @field and with GType @type.
1268 * Returns: %TRUE if the structure contains a field with the given name and type
1271 gst_structure_id_has_field_typed (const GstStructure * structure,
1272 GQuark field, GType type)
1274 GstStructureField *f;
1276 g_return_val_if_fail (structure != NULL, FALSE);
1277 g_return_val_if_fail (field != 0, FALSE);
1279 f = gst_structure_id_get_field (structure, field);
1283 return (G_VALUE_TYPE (&f->value) == type);
1287 * gst_structure_has_field_typed:
1288 * @structure: a #GstStructure
1289 * @fieldname: the name of a field
1290 * @type: the type of a value
1292 * Check if @structure contains a field named @fieldname and with GType @type.
1294 * Returns: %TRUE if the structure contains a field with the given name and type
1297 gst_structure_has_field_typed (const GstStructure * structure,
1298 const gchar * fieldname, GType type)
1300 g_return_val_if_fail (structure != NULL, FALSE);
1301 g_return_val_if_fail (fieldname != NULL, FALSE);
1303 return gst_structure_id_has_field_typed (structure,
1304 g_quark_from_string (fieldname), type);
1307 /* utility functions */
1310 * gst_structure_get_boolean:
1311 * @structure: a #GstStructure
1312 * @fieldname: the name of a field
1313 * @value: (out): a pointer to a #gboolean to set
1315 * Sets the boolean pointed to by @value corresponding to the value of the
1316 * given field. Caller is responsible for making sure the field exists
1317 * and has the correct type.
1319 * Returns: %TRUE if the value could be set correctly. If there was no field
1320 * with @fieldname or the existing field did not contain a boolean, this
1321 * function returns %FALSE.
1324 gst_structure_get_boolean (const GstStructure * structure,
1325 const gchar * fieldname, gboolean * value)
1327 GstStructureField *field;
1329 g_return_val_if_fail (structure != NULL, FALSE);
1330 g_return_val_if_fail (fieldname != NULL, FALSE);
1332 field = gst_structure_get_field (structure, fieldname);
1334 if (field == NULL || G_VALUE_TYPE (&field->value) != G_TYPE_BOOLEAN)
1337 *value = gst_g_value_get_boolean_unchecked (&field->value);
1343 * gst_structure_get_int:
1344 * @structure: a #GstStructure
1345 * @fieldname: the name of a field
1346 * @value: (out): a pointer to an int to set
1348 * Sets the int pointed to by @value corresponding to the value of the
1349 * given field. Caller is responsible for making sure the field exists
1350 * and has the correct type.
1352 * Returns: %TRUE if the value could be set correctly. If there was no field
1353 * with @fieldname or the existing field did not contain an int, this function
1357 gst_structure_get_int (const GstStructure * structure,
1358 const gchar * fieldname, gint * value)
1360 GstStructureField *field;
1362 g_return_val_if_fail (structure != NULL, FALSE);
1363 g_return_val_if_fail (fieldname != NULL, FALSE);
1364 g_return_val_if_fail (value != NULL, FALSE);
1366 field = gst_structure_get_field (structure, fieldname);
1368 if (field == NULL || G_VALUE_TYPE (&field->value) != G_TYPE_INT)
1371 *value = gst_g_value_get_int_unchecked (&field->value);
1377 * gst_structure_get_uint:
1378 * @structure: a #GstStructure
1379 * @fieldname: the name of a field
1380 * @value: (out): a pointer to a uint to set
1382 * Sets the uint pointed to by @value corresponding to the value of the
1383 * given field. Caller is responsible for making sure the field exists
1384 * and has the correct type.
1386 * Returns: %TRUE if the value could be set correctly. If there was no field
1387 * with @fieldname or the existing field did not contain a uint, this function
1391 gst_structure_get_uint (const GstStructure * structure,
1392 const gchar * fieldname, guint * value)
1394 GstStructureField *field;
1396 g_return_val_if_fail (structure != NULL, FALSE);
1397 g_return_val_if_fail (fieldname != NULL, FALSE);
1398 g_return_val_if_fail (value != NULL, FALSE);
1400 field = gst_structure_get_field (structure, fieldname);
1402 if (field == NULL || G_VALUE_TYPE (&field->value) != G_TYPE_UINT)
1405 *value = gst_g_value_get_uint_unchecked (&field->value);
1411 * gst_structure_get_int64:
1412 * @structure: a #GstStructure
1413 * @fieldname: the name of a field
1414 * @value: (out): a pointer to a #gint64 to set
1416 * Sets the #gint64 pointed to by @value corresponding to the value of the
1417 * given field. Caller is responsible for making sure the field exists
1418 * and has the correct type.
1420 * Returns: %TRUE if the value could be set correctly. If there was no field
1421 * with @fieldname or the existing field did not contain a #gint64, this function
1427 gst_structure_get_int64 (const GstStructure * structure,
1428 const gchar * fieldname, gint64 * value)
1430 GstStructureField *field;
1432 g_return_val_if_fail (structure != NULL, FALSE);
1433 g_return_val_if_fail (fieldname != NULL, FALSE);
1434 g_return_val_if_fail (value != NULL, FALSE);
1436 field = gst_structure_get_field (structure, fieldname);
1438 if (field == NULL || G_VALUE_TYPE (&field->value) != G_TYPE_INT64)
1441 *value = gst_g_value_get_int64_unchecked (&field->value);
1447 * gst_structure_get_uint64:
1448 * @structure: a #GstStructure
1449 * @fieldname: the name of a field
1450 * @value: (out): a pointer to a #guint64 to set
1452 * Sets the #guint64 pointed to by @value corresponding to the value of the
1453 * given field. Caller is responsible for making sure the field exists
1454 * and has the correct type.
1456 * Returns: %TRUE if the value could be set correctly. If there was no field
1457 * with @fieldname or the existing field did not contain a #guint64, this function
1463 gst_structure_get_uint64 (const GstStructure * structure,
1464 const gchar * fieldname, guint64 * value)
1466 GstStructureField *field;
1468 g_return_val_if_fail (structure != NULL, FALSE);
1469 g_return_val_if_fail (fieldname != NULL, FALSE);
1470 g_return_val_if_fail (value != NULL, FALSE);
1472 field = gst_structure_get_field (structure, fieldname);
1474 if (field == NULL || G_VALUE_TYPE (&field->value) != G_TYPE_UINT64)
1477 *value = gst_g_value_get_uint64_unchecked (&field->value);
1483 * gst_structure_get_date:
1484 * @structure: a #GstStructure
1485 * @fieldname: the name of a field
1486 * @value: (out callee-allocates): a pointer to a #GDate to set
1488 * Sets the date pointed to by @value corresponding to the date of the
1489 * given field. Caller is responsible for making sure the field exists
1490 * and has the correct type.
1492 * On success @value will point to a newly-allocated copy of the date which
1493 * should be freed with g_date_free() when no longer needed (note: this is
1494 * inconsistent with e.g. gst_structure_get_string() which doesn't return a
1495 * copy of the string).
1497 * Returns: %TRUE if the value could be set correctly. If there was no field
1498 * with @fieldname or the existing field did not contain a data, this function
1502 gst_structure_get_date (const GstStructure * structure, const gchar * fieldname,
1505 GstStructureField *field;
1507 g_return_val_if_fail (structure != NULL, FALSE);
1508 g_return_val_if_fail (fieldname != NULL, FALSE);
1509 g_return_val_if_fail (value != NULL, FALSE);
1511 field = gst_structure_get_field (structure, fieldname);
1513 if (field == NULL || G_VALUE_TYPE (&field->value) != G_TYPE_DATE)
1516 /* FIXME: 2.0 g_value_dup_boxed() -> g_value_get_boxed() */
1517 *value = g_value_dup_boxed (&field->value);
1523 * gst_structure_get_date_time:
1524 * @structure: a #GstStructure
1525 * @fieldname: the name of a field
1526 * @value: (out callee-allocates): a pointer to a #GstDateTime to set
1528 * Sets the datetime pointed to by @value corresponding to the datetime of the
1529 * given field. Caller is responsible for making sure the field exists
1530 * and has the correct type.
1532 * On success @value will point to a reference of the datetime which
1533 * should be unreffed with gst_date_time_unref() when no longer needed
1534 * (note: this is inconsistent with e.g. gst_structure_get_string()
1535 * which doesn't return a copy of the string).
1537 * Returns: %TRUE if the value could be set correctly. If there was no field
1538 * with @fieldname or the existing field did not contain a data, this function
1542 gst_structure_get_date_time (const GstStructure * structure,
1543 const gchar * fieldname, GstDateTime ** value)
1545 GstStructureField *field;
1547 g_return_val_if_fail (structure != NULL, FALSE);
1548 g_return_val_if_fail (fieldname != NULL, FALSE);
1549 g_return_val_if_fail (value != NULL, FALSE);
1551 field = gst_structure_get_field (structure, fieldname);
1555 if (!GST_VALUE_HOLDS_DATE_TIME (&field->value))
1558 /* FIXME 2.0: g_value_dup_boxed() -> g_value_get_boxed() */
1559 *value = g_value_dup_boxed (&field->value);
1565 * gst_structure_get_clock_time:
1566 * @structure: a #GstStructure
1567 * @fieldname: the name of a field
1568 * @value: (out): a pointer to a #GstClockTime to set
1570 * Sets the clock time pointed to by @value corresponding to the clock time
1571 * of the given field. Caller is responsible for making sure the field exists
1572 * and has the correct type.
1574 * Returns: %TRUE if the value could be set correctly. If there was no field
1575 * with @fieldname or the existing field did not contain a #GstClockTime, this
1576 * function returns %FALSE.
1579 gst_structure_get_clock_time (const GstStructure * structure,
1580 const gchar * fieldname, GstClockTime * value)
1582 return gst_structure_get_uint64 (structure, fieldname, value);
1586 * gst_structure_get_double:
1587 * @structure: a #GstStructure
1588 * @fieldname: the name of a field
1589 * @value: (out): a pointer to a gdouble to set
1591 * Sets the double pointed to by @value corresponding to the value of the
1592 * given field. Caller is responsible for making sure the field exists
1593 * and has the correct type.
1595 * Returns: %TRUE if the value could be set correctly. If there was no field
1596 * with @fieldname or the existing field did not contain a double, this
1597 * function returns %FALSE.
1600 gst_structure_get_double (const GstStructure * structure,
1601 const gchar * fieldname, gdouble * value)
1603 GstStructureField *field;
1605 g_return_val_if_fail (structure != NULL, FALSE);
1606 g_return_val_if_fail (fieldname != NULL, FALSE);
1607 g_return_val_if_fail (value != NULL, FALSE);
1609 field = gst_structure_get_field (structure, fieldname);
1611 if (field == NULL || G_VALUE_TYPE (&field->value) != G_TYPE_DOUBLE)
1614 *value = gst_g_value_get_double_unchecked (&field->value);
1620 * gst_structure_get_string:
1621 * @structure: a #GstStructure
1622 * @fieldname: the name of a field
1624 * Finds the field corresponding to @fieldname, and returns the string
1625 * contained in the field's value. Caller is responsible for making
1626 * sure the field exists and has the correct type.
1628 * The string should not be modified, and remains valid until the next
1629 * call to a gst_structure_*() function with the given structure.
1631 * Returns: (nullable): a pointer to the string or %NULL when the
1632 * field did not exist or did not contain a string.
1635 gst_structure_get_string (const GstStructure * structure,
1636 const gchar * fieldname)
1638 GstStructureField *field;
1640 g_return_val_if_fail (structure != NULL, NULL);
1641 g_return_val_if_fail (fieldname != NULL, NULL);
1643 field = gst_structure_get_field (structure, fieldname);
1645 if (field == NULL || G_VALUE_TYPE (&field->value) != G_TYPE_STRING)
1648 return gst_g_value_get_string_unchecked (&field->value);
1652 * gst_structure_get_enum:
1653 * @structure: a #GstStructure
1654 * @fieldname: the name of a field
1655 * @enumtype: the enum type of a field
1656 * @value: (out): a pointer to an int to set
1658 * Sets the int pointed to by @value corresponding to the value of the
1659 * given field. Caller is responsible for making sure the field exists,
1660 * has the correct type and that the enumtype is correct.
1662 * Returns: %TRUE if the value could be set correctly. If there was no field
1663 * with @fieldname or the existing field did not contain an enum of the given
1664 * type, this function returns %FALSE.
1667 gst_structure_get_enum (const GstStructure * structure,
1668 const gchar * fieldname, GType enumtype, gint * value)
1670 GstStructureField *field;
1672 g_return_val_if_fail (structure != NULL, FALSE);
1673 g_return_val_if_fail (fieldname != NULL, FALSE);
1674 g_return_val_if_fail (enumtype != G_TYPE_INVALID, FALSE);
1675 g_return_val_if_fail (value != NULL, FALSE);
1677 field = gst_structure_get_field (structure, fieldname);
1681 if (!G_TYPE_CHECK_VALUE_TYPE (&field->value, enumtype))
1684 *value = g_value_get_enum (&field->value);
1690 * gst_structure_get_fraction:
1691 * @structure: a #GstStructure
1692 * @fieldname: the name of a field
1693 * @value_numerator: (out): a pointer to an int to set
1694 * @value_denominator: (out): a pointer to an int to set
1696 * Sets the integers pointed to by @value_numerator and @value_denominator
1697 * corresponding to the value of the given field. Caller is responsible
1698 * for making sure the field exists and has the correct type.
1700 * Returns: %TRUE if the values could be set correctly. If there was no field
1701 * with @fieldname or the existing field did not contain a GstFraction, this
1702 * function returns %FALSE.
1705 gst_structure_get_fraction (const GstStructure * structure,
1706 const gchar * fieldname, gint * value_numerator, gint * value_denominator)
1708 GstStructureField *field;
1710 g_return_val_if_fail (structure != NULL, FALSE);
1711 g_return_val_if_fail (fieldname != NULL, FALSE);
1712 g_return_val_if_fail (value_numerator != NULL, FALSE);
1713 g_return_val_if_fail (value_denominator != NULL, FALSE);
1715 field = gst_structure_get_field (structure, fieldname);
1717 if (field == NULL || G_VALUE_TYPE (&field->value) != GST_TYPE_FRACTION)
1720 *value_numerator = gst_value_get_fraction_numerator (&field->value);
1721 *value_denominator = gst_value_get_fraction_denominator (&field->value);
1727 * gst_structure_get_flagset:
1728 * @structure: a #GstStructure
1729 * @fieldname: the name of a field
1730 * @value_flags: (out) (allow-none): a pointer to a guint for the flags field
1731 * @value_mask: (out) (allow-none): a pointer to a guint for the mask field
1733 * Read the GstFlagSet flags and mask out of the structure into the
1734 * provided pointers.
1736 * Returns: %TRUE if the values could be set correctly. If there was no field
1737 * with @fieldname or the existing field did not contain a GstFlagSet, this
1738 * function returns %FALSE.
1743 gst_structure_get_flagset (const GstStructure * structure,
1744 const gchar * fieldname, guint * value_flags, guint * value_mask)
1746 GstStructureField *field;
1748 g_return_val_if_fail (structure != NULL, FALSE);
1749 g_return_val_if_fail (fieldname != NULL, FALSE);
1751 field = gst_structure_get_field (structure, fieldname);
1753 if (field == NULL || !GST_VALUE_HOLDS_FLAG_SET (&field->value))
1757 *value_flags = gst_value_get_flagset_flags (&field->value);
1759 *value_mask = gst_value_get_flagset_mask (&field->value);
1765 gst_structure_value_get_generic_type (const GValue * val)
1767 if (G_VALUE_TYPE (val) == GST_TYPE_LIST
1768 || G_VALUE_TYPE (val) == GST_TYPE_ARRAY) {
1769 GArray *array = g_value_peek_pointer (val);
1771 if (array->len > 0) {
1772 GValue *value = &g_array_index (array, GValue, 0);
1774 return gst_structure_value_get_generic_type (value);
1778 } else if (G_VALUE_TYPE (val) == GST_TYPE_INT_RANGE) {
1780 } else if (G_VALUE_TYPE (val) == GST_TYPE_INT64_RANGE) {
1781 return G_TYPE_INT64;
1782 } else if (G_VALUE_TYPE (val) == GST_TYPE_DOUBLE_RANGE) {
1783 return G_TYPE_DOUBLE;
1784 } else if (G_VALUE_TYPE (val) == GST_TYPE_FRACTION_RANGE) {
1785 return GST_TYPE_FRACTION;
1787 return G_VALUE_TYPE (val);
1791 priv_gst_structure_append_to_gstring (const GstStructure * structure,
1794 GstStructureField *field;
1797 g_return_val_if_fail (s != NULL, FALSE);
1799 len = GST_STRUCTURE_FIELDS (structure)->len;
1800 for (i = 0; i < len; i++) {
1804 field = GST_STRUCTURE_FIELD (structure, i);
1806 if (G_VALUE_TYPE (&field->value) == GST_TYPE_ARRAY) {
1807 t = _priv_gst_value_serialize_any_list (&field->value, "< ", " >", FALSE);
1808 } else if (G_VALUE_TYPE (&field->value) == GST_TYPE_LIST) {
1809 t = _priv_gst_value_serialize_any_list (&field->value, "{ ", " }", FALSE);
1811 t = gst_value_serialize (&field->value);
1814 type = gst_structure_value_get_generic_type (&field->value);
1816 g_string_append_len (s, ", ", 2);
1817 /* FIXME: do we need to escape fieldnames? */
1818 g_string_append (s, g_quark_to_string (field->name));
1819 g_string_append_len (s, "=(", 2);
1820 g_string_append (s, _priv_gst_value_gtype_to_abbr (type));
1821 g_string_append_c (s, ')');
1823 g_string_append (s, t);
1826 if (!G_TYPE_CHECK_VALUE_TYPE (&field->value, G_TYPE_STRING) &&
1827 !(G_TYPE_CHECK_VALUE_TYPE (&field->value, G_TYPE_POINTER) &&
1828 g_value_get_pointer (&field->value) == NULL))
1829 GST_WARNING ("No value transform to serialize field '%s' of type '%s'",
1830 g_quark_to_string (field->name),
1831 _priv_gst_value_gtype_to_abbr (type));
1832 g_string_append (s, "NULL");
1836 g_string_append_c (s, ';');
1841 priv__gst_structure_append_template_to_gstring (GQuark field_id,
1842 const GValue * value, gpointer user_data)
1844 GType type = gst_structure_value_get_generic_type (value);
1845 GString *s = (GString *) user_data;
1847 g_string_append_len (s, ", ", 2);
1848 /* FIXME: do we need to escape fieldnames? */
1849 g_string_append (s, g_quark_to_string (field_id));
1850 g_string_append_len (s, "=(", 2);
1851 g_string_append (s, _priv_gst_value_gtype_to_abbr (type));
1852 g_string_append_c (s, ')');
1854 //TODO(ensonic): table like GstStructureAbbreviation (or extend it)
1855 if (type == G_TYPE_INT) {
1856 g_string_append_len (s, "%i", 2);
1857 } else if (type == G_TYPE_UINT) {
1858 g_string_append_len (s, "%u", 2);
1859 } else if (type == G_TYPE_FLOAT) {
1860 g_string_append_len (s, "%f", 2);
1861 } else if (type == G_TYPE_DOUBLE) {
1862 g_string_append_len (s, "%lf", 3);
1863 } else if (type == G_TYPE_STRING) {
1864 g_string_append_len (s, "%s", 2);
1865 } else if (type == G_TYPE_BOOLEAN) {
1866 /* we normally store this as a string, but can parse it also from an int */
1867 g_string_append_len (s, "%i", 2);
1868 } else if (type == G_TYPE_INT64) {
1869 g_string_append (s, "%" G_GINT64_FORMAT);
1870 } else if (type == G_TYPE_UINT64) {
1871 g_string_append (s, "%" G_GUINT64_FORMAT);
1872 } else if (type == GST_TYPE_STRUCTURE) {
1873 g_string_append (s, "%" GST_WRAPPED_PTR_FORMAT);
1874 } else if (g_type_is_a (type, G_TYPE_ENUM)
1875 || g_type_is_a (type, G_TYPE_FLAGS)) {
1876 g_string_append_len (s, "%i", 2);
1877 } else if (type == G_TYPE_GTYPE) {
1878 g_string_append_len (s, "%s", 2);
1879 } else if (type == G_TYPE_POINTER) {
1880 g_string_append_len (s, "%p", 2);
1882 GST_WARNING ("unhandled type: %s", g_type_name (type));
1883 g_string_append (s, "%" GST_WRAPPED_PTR_FORMAT);
1890 * gst_structure_to_string:
1891 * @structure: a #GstStructure
1893 * Converts @structure to a human-readable string representation.
1895 * For debugging purposes its easier to do something like this:
1896 * |[<!-- language="C" -->
1897 * GST_LOG ("structure is %" GST_PTR_FORMAT, structure);
1899 * This prints the structure in human readable form.
1901 * The current implementation of serialization will lead to unexpected results
1902 * when there are nested #GstCaps / #GstStructure deeper than one level.
1904 * Free-function: g_free
1906 * Returns: (transfer full): a pointer to string allocated by g_malloc().
1907 * g_free() after usage.
1910 gst_structure_to_string (const GstStructure * structure)
1914 /* NOTE: This function is potentially called by the debug system,
1915 * so any calls to gst_log() (and GST_DEBUG(), GST_LOG(), etc.)
1916 * should be careful to avoid recursion. This includes any functions
1917 * called by gst_structure_to_string. In particular, calls should
1918 * not use the GST_PTR_FORMAT extension. */
1920 g_return_val_if_fail (structure != NULL, NULL);
1922 /* we estimate a minimum size based on the number of fields in order to
1923 * avoid unnecessary reallocs within GString */
1924 s = g_string_sized_new (STRUCTURE_ESTIMATED_STRING_LEN (structure));
1925 g_string_append (s, g_quark_to_string (structure->name));
1926 priv_gst_structure_append_to_gstring (structure, s);
1927 return g_string_free (s, FALSE);
1931 gst_structure_parse_field (gchar * str,
1932 gchar ** after, GstStructureField * field)
1941 while (g_ascii_isspace (*s) || (s[0] == '\\' && g_ascii_isspace (s[1])))
1944 if (G_UNLIKELY (!_priv_gst_value_parse_simple_string (s, &name_end))) {
1945 GST_WARNING ("failed to parse simple string, str=%s", str);
1950 while (g_ascii_isspace (*s) || (s[0] == '\\' && g_ascii_isspace (s[1])))
1953 if (G_UNLIKELY (*s != '=')) {
1954 GST_WARNING ("missing assignment operator in the field, str=%s", str);
1961 field->name = g_quark_from_string (name);
1962 GST_DEBUG ("trying field name '%s'", name);
1965 if (G_UNLIKELY (!_priv_gst_value_parse_value (s, &s, &field->value,
1967 GST_WARNING ("failed to parse value %s", str);
1976 priv_gst_structure_parse_name (gchar * str, gchar ** start, gchar ** end,
1984 /* skip spaces (FIXME: _isspace treats tabs and newlines as space!) */
1985 while (*r && (g_ascii_isspace (*r) || (r[0] == '\\'
1986 && g_ascii_isspace (r[1]))))
1991 if (G_UNLIKELY (!_priv_gst_value_parse_string (r, &w, &r, TRUE))) {
1992 GST_WARNING ("Failed to parse structure string '%s'", str);
2003 priv_gst_structure_parse_fields (gchar * str, gchar ** end,
2004 GstStructure * structure)
2007 GstStructureField field;
2012 while (*r && (g_ascii_isspace (*r) || (r[0] == '\\'
2013 && g_ascii_isspace (r[1]))))
2016 /* end of structure, get the next char and finish */
2021 /* accept \0 as end delimiter */
2024 if (G_UNLIKELY (*r != ',')) {
2025 GST_WARNING ("Failed to find delimiter, r=%s", r);
2029 while (*r && (g_ascii_isspace (*r) || (r[0] == '\\'
2030 && g_ascii_isspace (r[1]))))
2033 memset (&field, 0, sizeof (field));
2034 if (G_UNLIKELY (!gst_structure_parse_field (r, &r, &field))) {
2035 GST_WARNING ("Failed to parse field, r=%s", r);
2038 gst_structure_set_field (structure, &field);
2047 * gst_structure_new_from_string:
2048 * @string: a string representation of a #GstStructure
2050 * Creates a #GstStructure from a string representation.
2051 * If end is not %NULL, a pointer to the place inside the given string
2052 * where parsing ended will be returned.
2054 * The current implementation of serialization will lead to unexpected results
2055 * when there are nested #GstCaps / #GstStructure deeper than one level.
2057 * Free-function: gst_structure_free
2059 * Returns: (transfer full) (nullable): a new #GstStructure or %NULL
2060 * when the string could not be parsed. Free with
2061 * gst_structure_free() after use.
2066 gst_structure_new_from_string (const gchar * string)
2068 return gst_structure_from_string (string, NULL);
2072 * gst_structure_from_string:
2073 * @string: a string representation of a #GstStructure.
2074 * @end: (out) (allow-none) (transfer none) (skip): pointer to store the end of the string in.
2076 * Creates a #GstStructure from a string representation.
2077 * If end is not %NULL, a pointer to the place inside the given string
2078 * where parsing ended will be returned.
2080 * Free-function: gst_structure_free
2082 * Returns: (transfer full) (nullable): a new #GstStructure or %NULL
2083 * when the string could not be parsed. Free with
2084 * gst_structure_free() after use.
2087 gst_structure_from_string (const gchar * string, gchar ** end)
2094 GstStructure *structure = NULL;
2096 g_return_val_if_fail (string != NULL, NULL);
2098 copy = g_strdup (string);
2101 if (!priv_gst_structure_parse_name (r, &name, &w, &r))
2106 structure = gst_structure_new_empty (name);
2109 if (G_UNLIKELY (structure == NULL))
2112 if (!priv_gst_structure_parse_fields (r, &r, structure))
2116 *end = (char *) string + (r - copy);
2118 g_warning ("gst_structure_from_string did not consume whole string,"
2119 " but caller did not provide end pointer (\"%s\")", string);
2126 gst_structure_free (structure);
2132 gst_structure_transform_to_string (const GValue * src_value,
2133 GValue * dest_value)
2135 g_return_if_fail (src_value != NULL);
2136 g_return_if_fail (dest_value != NULL);
2138 dest_value->data[0].v_pointer =
2139 gst_structure_to_string (src_value->data[0].v_pointer);
2142 static GstStructure *
2143 gst_structure_copy_conditional (const GstStructure * structure)
2146 return gst_structure_copy (structure);
2150 /* fixate utility functions */
2153 * gst_structure_fixate_field_nearest_int:
2154 * @structure: a #GstStructure
2155 * @field_name: a field in @structure
2156 * @target: the target value of the fixation
2158 * Fixates a #GstStructure by changing the given field to the nearest
2159 * integer to @target that is a subset of the existing field.
2161 * Returns: %TRUE if the structure could be fixated
2164 gst_structure_fixate_field_nearest_int (GstStructure * structure,
2165 const char *field_name, int target)
2167 const GValue *value;
2169 g_return_val_if_fail (gst_structure_has_field (structure, field_name), FALSE);
2170 g_return_val_if_fail (IS_MUTABLE (structure), FALSE);
2172 value = gst_structure_get_value (structure, field_name);
2174 if (G_VALUE_TYPE (value) == G_TYPE_INT) {
2177 } else if (G_VALUE_TYPE (value) == GST_TYPE_INT_RANGE) {
2180 x = gst_value_get_int_range_min (value);
2183 x = gst_value_get_int_range_max (value);
2186 gst_structure_set (structure, field_name, G_TYPE_INT, target, NULL);
2188 } else if (G_VALUE_TYPE (value) == GST_TYPE_LIST) {
2189 const GValue *list_value;
2192 int best_index = -1;
2194 n = gst_value_list_get_size (value);
2195 for (i = 0; i < n; i++) {
2196 list_value = gst_value_list_get_value (value, i);
2197 if (G_VALUE_TYPE (list_value) == G_TYPE_INT) {
2198 int x = gst_g_value_get_int_unchecked (list_value);
2200 if (best_index == -1 || (ABS (target - x) < ABS (target - best))) {
2206 if (best_index != -1) {
2207 gst_structure_set (structure, field_name, G_TYPE_INT, best, NULL);
2217 * gst_structure_fixate_field_nearest_double:
2218 * @structure: a #GstStructure
2219 * @field_name: a field in @structure
2220 * @target: the target value of the fixation
2222 * Fixates a #GstStructure by changing the given field to the nearest
2223 * double to @target that is a subset of the existing field.
2225 * Returns: %TRUE if the structure could be fixated
2228 gst_structure_fixate_field_nearest_double (GstStructure * structure,
2229 const char *field_name, double target)
2231 const GValue *value;
2233 g_return_val_if_fail (gst_structure_has_field (structure, field_name), FALSE);
2234 g_return_val_if_fail (IS_MUTABLE (structure), FALSE);
2236 value = gst_structure_get_value (structure, field_name);
2238 if (G_VALUE_TYPE (value) == G_TYPE_DOUBLE) {
2241 } else if (G_VALUE_TYPE (value) == GST_TYPE_DOUBLE_RANGE) {
2244 x = gst_value_get_double_range_min (value);
2247 x = gst_value_get_double_range_max (value);
2250 gst_structure_set (structure, field_name, G_TYPE_DOUBLE, target, NULL);
2252 } else if (G_VALUE_TYPE (value) == GST_TYPE_LIST) {
2253 const GValue *list_value;
2256 int best_index = -1;
2258 n = gst_value_list_get_size (value);
2259 for (i = 0; i < n; i++) {
2260 list_value = gst_value_list_get_value (value, i);
2261 if (G_VALUE_TYPE (list_value) == G_TYPE_DOUBLE) {
2262 double x = gst_g_value_get_double_unchecked (list_value);
2264 if (best_index == -1 || (ABS (target - x) < ABS (target - best))) {
2270 if (best_index != -1) {
2271 gst_structure_set (structure, field_name, G_TYPE_DOUBLE, best, NULL);
2282 * gst_structure_fixate_field_boolean:
2283 * @structure: a #GstStructure
2284 * @field_name: a field in @structure
2285 * @target: the target value of the fixation
2287 * Fixates a #GstStructure by changing the given @field_name field to the given
2288 * @target boolean if that field is not fixed yet.
2290 * Returns: %TRUE if the structure could be fixated
2293 gst_structure_fixate_field_boolean (GstStructure * structure,
2294 const char *field_name, gboolean target)
2296 const GValue *value;
2298 g_return_val_if_fail (gst_structure_has_field (structure, field_name), FALSE);
2299 g_return_val_if_fail (IS_MUTABLE (structure), FALSE);
2301 value = gst_structure_get_value (structure, field_name);
2303 if (G_VALUE_TYPE (value) == G_TYPE_BOOLEAN) {
2306 } else if (G_VALUE_TYPE (value) == GST_TYPE_LIST) {
2307 const GValue *list_value;
2310 int best_index = -1;
2312 n = gst_value_list_get_size (value);
2313 for (i = 0; i < n; i++) {
2314 list_value = gst_value_list_get_value (value, i);
2315 if (G_VALUE_TYPE (list_value) == G_TYPE_BOOLEAN) {
2316 gboolean x = gst_g_value_get_boolean_unchecked (list_value);
2318 if (best_index == -1 || x == target) {
2324 if (best_index != -1) {
2325 gst_structure_set (structure, field_name, G_TYPE_BOOLEAN, best, NULL);
2335 * gst_structure_fixate_field_string:
2336 * @structure: a #GstStructure
2337 * @field_name: a field in @structure
2338 * @target: the target value of the fixation
2340 * Fixates a #GstStructure by changing the given @field_name field to the given
2341 * @target string if that field is not fixed yet.
2343 * Returns: %TRUE if the structure could be fixated
2346 gst_structure_fixate_field_string (GstStructure * structure,
2347 const gchar * field_name, const gchar * target)
2349 const GValue *value;
2351 g_return_val_if_fail (gst_structure_has_field (structure, field_name), FALSE);
2352 g_return_val_if_fail (IS_MUTABLE (structure), FALSE);
2354 value = gst_structure_get_value (structure, field_name);
2356 if (G_VALUE_TYPE (value) == G_TYPE_STRING) {
2359 } else if (G_VALUE_TYPE (value) == GST_TYPE_LIST) {
2360 const GValue *list_value;
2362 const gchar *best = NULL;
2363 int best_index = -1;
2365 n = gst_value_list_get_size (value);
2366 for (i = 0; i < n; i++) {
2367 list_value = gst_value_list_get_value (value, i);
2368 if (G_VALUE_TYPE (list_value) == G_TYPE_STRING) {
2369 const gchar *x = g_value_get_string (list_value);
2371 if (best_index == -1 || g_str_equal (x, target)) {
2377 if (best_index != -1) {
2378 gst_structure_set (structure, field_name, G_TYPE_STRING, best, NULL);
2388 * gst_structure_fixate_field_nearest_fraction:
2389 * @structure: a #GstStructure
2390 * @field_name: a field in @structure
2391 * @target_numerator: The numerator of the target value of the fixation
2392 * @target_denominator: The denominator of the target value of the fixation
2394 * Fixates a #GstStructure by changing the given field to the nearest
2395 * fraction to @target_numerator/@target_denominator that is a subset
2396 * of the existing field.
2398 * Returns: %TRUE if the structure could be fixated
2401 gst_structure_fixate_field_nearest_fraction (GstStructure * structure,
2402 const char *field_name, const gint target_numerator,
2403 const gint target_denominator)
2405 const GValue *value;
2407 g_return_val_if_fail (gst_structure_has_field (structure, field_name), FALSE);
2408 g_return_val_if_fail (IS_MUTABLE (structure), FALSE);
2409 g_return_val_if_fail (target_denominator != 0, FALSE);
2411 value = gst_structure_get_value (structure, field_name);
2413 if (G_VALUE_TYPE (value) == GST_TYPE_FRACTION) {
2416 } else if (G_VALUE_TYPE (value) == GST_TYPE_FRACTION_RANGE) {
2417 const GValue *x, *new_value;
2418 GValue target = { 0 };
2419 g_value_init (&target, GST_TYPE_FRACTION);
2420 gst_value_set_fraction (&target, target_numerator, target_denominator);
2422 new_value = ⌖
2423 x = gst_value_get_fraction_range_min (value);
2424 if (gst_value_compare (&target, x) == GST_VALUE_LESS_THAN)
2426 x = gst_value_get_fraction_range_max (value);
2427 if (gst_value_compare (&target, x) == GST_VALUE_GREATER_THAN)
2430 gst_structure_set_value (structure, field_name, new_value);
2431 g_value_unset (&target);
2433 } else if (G_VALUE_TYPE (value) == GST_TYPE_LIST) {
2434 const GValue *list_value;
2436 const GValue *best = NULL;
2439 gdouble best_diff = G_MAXDOUBLE;
2441 target = (gdouble) target_numerator / (gdouble) target_denominator;
2443 GST_DEBUG ("target %g, best %g", target, best_diff);
2447 n = gst_value_list_get_size (value);
2448 for (i = 0; i < n; i++) {
2449 list_value = gst_value_list_get_value (value, i);
2450 if (G_VALUE_TYPE (list_value) == GST_TYPE_FRACTION) {
2452 gdouble list_double;
2454 num = gst_value_get_fraction_numerator (list_value);
2455 denom = gst_value_get_fraction_denominator (list_value);
2457 list_double = ((gdouble) num / (gdouble) denom);
2458 cur_diff = target - list_double;
2460 GST_DEBUG ("curr diff %g, list %g", cur_diff, list_double);
2463 cur_diff = -cur_diff;
2465 if (!best || cur_diff < best_diff) {
2466 GST_DEBUG ("new best %g", list_double);
2468 best_diff = cur_diff;
2473 gst_structure_set_value (structure, field_name, best);
2482 default_fixate (GQuark field_id, const GValue * value, gpointer data)
2484 GstStructure *s = data;
2487 if (gst_value_fixate (&v, value)) {
2488 gst_structure_id_take_value (s, field_id, &v);
2494 * gst_structure_fixate_field:
2495 * @structure: a #GstStructure
2496 * @field_name: a field in @structure
2498 * Fixates a #GstStructure by changing the given field with its fixated value.
2500 * Returns: %TRUE if the structure field could be fixated
2503 gst_structure_fixate_field (GstStructure * structure, const char *field_name)
2505 GstStructureField *field;
2507 g_return_val_if_fail (structure != NULL, FALSE);
2508 g_return_val_if_fail (IS_MUTABLE (structure), FALSE);
2510 if (!(field = gst_structure_get_field (structure, field_name)))
2513 return default_fixate (field->name, &field->value, structure);
2516 /* our very own version of G_VALUE_LCOPY that allows NULL return locations
2517 * (useful for message parsing functions where the return location is user
2518 * supplied and the user may pass %NULL if the value isn't of interest) */
2519 #define GST_VALUE_LCOPY(value, var_args, flags, __error, fieldname) \
2521 const GValue *_value = (value); \
2522 guint _flags = (flags); \
2523 GType _value_type = G_VALUE_TYPE (_value); \
2524 GTypeValueTable *_vtable = g_type_value_table_peek (_value_type); \
2525 const gchar *_lcopy_format = _vtable->lcopy_format; \
2526 GTypeCValue _cvalues[G_VALUE_COLLECT_FORMAT_MAX_LENGTH] = { { 0, }, }; \
2527 guint _n_values = 0; \
2529 while (*_lcopy_format != '\0') { \
2530 g_assert (*_lcopy_format == G_VALUE_COLLECT_POINTER); \
2531 _cvalues[_n_values++].v_pointer = va_arg ((var_args), gpointer); \
2534 if (_n_values == 2 && !!_cvalues[0].v_pointer != !!_cvalues[1].v_pointer) { \
2535 *(__error) = g_strdup_printf ("either all or none of the return " \
2536 "locations for field '%s' need to be NULL", fieldname); \
2537 } else if (_cvalues[0].v_pointer != NULL) { \
2538 *(__error) = _vtable->lcopy_value (_value, _n_values, _cvalues, _flags); \
2543 * gst_structure_get_valist:
2544 * @structure: a #GstStructure
2545 * @first_fieldname: the name of the first field to read
2546 * @args: variable arguments
2548 * Parses the variable arguments and reads fields from @structure accordingly.
2549 * valist-variant of gst_structure_get(). Look at the documentation of
2550 * gst_structure_get() for more details.
2552 * Returns: %TRUE, or %FALSE if there was a problem reading any of the fields
2555 gst_structure_get_valist (const GstStructure * structure,
2556 const char *first_fieldname, va_list args)
2558 const char *field_name;
2559 GType expected_type = G_TYPE_INVALID;
2561 g_return_val_if_fail (GST_IS_STRUCTURE (structure), FALSE);
2562 g_return_val_if_fail (first_fieldname != NULL, FALSE);
2564 field_name = first_fieldname;
2565 while (field_name) {
2566 const GValue *val = NULL;
2569 expected_type = va_arg (args, GType);
2571 val = gst_structure_get_value (structure, field_name);
2576 if (G_VALUE_TYPE (val) != expected_type)
2579 GST_VALUE_LCOPY (val, args, 0, &err, field_name);
2581 g_warning ("%s: %s", G_STRFUNC, err);
2586 field_name = va_arg (args, const gchar *);
2594 GST_INFO ("Expected field '%s' in structure: %" GST_PTR_FORMAT,
2595 field_name, structure);
2600 GST_INFO ("Expected field '%s' in structure to be of type '%s', but "
2601 "field was of type '%s': %" GST_PTR_FORMAT, field_name,
2602 GST_STR_NULL (g_type_name (expected_type)),
2603 G_VALUE_TYPE_NAME (gst_structure_get_value (structure, field_name)),
2610 * gst_structure_id_get_valist:
2611 * @structure: a #GstStructure
2612 * @first_field_id: the quark of the first field to read
2613 * @args: variable arguments
2615 * Parses the variable arguments and reads fields from @structure accordingly.
2616 * valist-variant of gst_structure_id_get(). Look at the documentation of
2617 * gst_structure_id_get() for more details.
2619 * Returns: %TRUE, or %FALSE if there was a problem reading any of the fields
2622 gst_structure_id_get_valist (const GstStructure * structure,
2623 GQuark first_field_id, va_list args)
2626 GType expected_type = G_TYPE_INVALID;
2628 g_return_val_if_fail (GST_IS_STRUCTURE (structure), FALSE);
2629 g_return_val_if_fail (first_field_id != 0, FALSE);
2631 field_id = first_field_id;
2633 const GValue *val = NULL;
2636 expected_type = va_arg (args, GType);
2638 val = gst_structure_id_get_value (structure, field_id);
2643 if (G_VALUE_TYPE (val) != expected_type)
2646 GST_VALUE_LCOPY (val, args, 0, &err, g_quark_to_string (field_id));
2648 g_warning ("%s: %s", G_STRFUNC, err);
2653 field_id = va_arg (args, GQuark);
2661 GST_DEBUG ("Expected field '%s' in structure: %" GST_PTR_FORMAT,
2662 GST_STR_NULL (g_quark_to_string (field_id)), structure);
2667 GST_DEBUG ("Expected field '%s' in structure to be of type '%s', but "
2668 "field was of type '%s': %" GST_PTR_FORMAT,
2669 g_quark_to_string (field_id),
2670 GST_STR_NULL (g_type_name (expected_type)),
2671 G_VALUE_TYPE_NAME (gst_structure_id_get_value (structure, field_id)),
2678 * gst_structure_get:
2679 * @structure: a #GstStructure
2680 * @first_fieldname: the name of the first field to read
2681 * @...: variable arguments
2683 * Parses the variable arguments and reads fields from @structure accordingly.
2684 * Variable arguments should be in the form field name, field type
2685 * (as a GType), pointer(s) to a variable(s) to hold the return value(s).
2686 * The last variable argument should be %NULL.
2688 * For refcounted (mini)objects you will receive a new reference which
2689 * you must release with a suitable _unref() when no longer needed. For
2690 * strings and boxed types you will receive a copy which you will need to
2691 * release with either g_free() or the suitable function for the boxed type.
2693 * Returns: %FALSE if there was a problem reading any of the fields (e.g.
2694 * because the field requested did not exist, or was of a type other
2695 * than the type specified), otherwise %TRUE.
2698 gst_structure_get (const GstStructure * structure, const char *first_fieldname,
2704 g_return_val_if_fail (GST_IS_STRUCTURE (structure), FALSE);
2705 g_return_val_if_fail (first_fieldname != NULL, FALSE);
2707 va_start (args, first_fieldname);
2708 ret = gst_structure_get_valist (structure, first_fieldname, args);
2715 * gst_structure_id_get:
2716 * @structure: a #GstStructure
2717 * @first_field_id: the quark of the first field to read
2718 * @...: variable arguments
2720 * Parses the variable arguments and reads fields from @structure accordingly.
2721 * Variable arguments should be in the form field id quark, field type
2722 * (as a GType), pointer(s) to a variable(s) to hold the return value(s).
2723 * The last variable argument should be %NULL (technically it should be a
2724 * 0 quark, but we require %NULL so compilers that support it can check for
2725 * the %NULL terminator and warn if it's not there).
2727 * This function is just like gst_structure_get() only that it is slightly
2728 * more efficient since it saves the string-to-quark lookup in the global
2731 * For refcounted (mini)objects you will receive a new reference which
2732 * you must release with a suitable _unref() when no longer needed. For
2733 * strings and boxed types you will receive a copy which you will need to
2734 * release with either g_free() or the suitable function for the boxed type.
2736 * Returns: %FALSE if there was a problem reading any of the fields (e.g.
2737 * because the field requested did not exist, or was of a type other
2738 * than the type specified), otherwise %TRUE.
2741 gst_structure_id_get (const GstStructure * structure, GQuark first_field_id,
2747 g_return_val_if_fail (GST_IS_STRUCTURE (structure), FALSE);
2748 g_return_val_if_fail (first_field_id != 0, FALSE);
2750 va_start (args, first_field_id);
2751 ret = gst_structure_id_get_valist (structure, first_field_id, args);
2758 gst_structure_is_equal_foreach (GQuark field_id, const GValue * val2,
2761 const GstStructure *struct1 = (const GstStructure *) data;
2762 const GValue *val1 = gst_structure_id_get_value (struct1, field_id);
2764 if (G_UNLIKELY (val1 == NULL))
2766 if (gst_value_compare (val1, val2) == GST_VALUE_EQUAL) {
2774 * gst_structure_is_equal:
2775 * @structure1: a #GstStructure.
2776 * @structure2: a #GstStructure.
2778 * Tests if the two #GstStructure are equal.
2780 * Returns: %TRUE if the two structures have the same name and field.
2783 gst_structure_is_equal (const GstStructure * structure1,
2784 const GstStructure * structure2)
2786 g_return_val_if_fail (GST_IS_STRUCTURE (structure1), FALSE);
2787 g_return_val_if_fail (GST_IS_STRUCTURE (structure2), FALSE);
2789 if (G_UNLIKELY (structure1 == structure2))
2792 if (structure1->name != structure2->name) {
2795 if (GST_STRUCTURE_FIELDS (structure1)->len !=
2796 GST_STRUCTURE_FIELDS (structure2)->len) {
2800 return gst_structure_foreach (structure1, gst_structure_is_equal_foreach,
2801 (gpointer) structure2);
2808 const GstStructure *intersect;
2813 gst_structure_intersect_field1 (GQuark id, const GValue * val1, gpointer data)
2815 IntersectData *idata = (IntersectData *) data;
2816 const GValue *val2 = gst_structure_id_get_value (idata->intersect, id);
2818 if (G_UNLIKELY (val2 == NULL)) {
2819 gst_structure_id_set_value (idata->dest, id, val1);
2821 GValue dest_value = { 0 };
2822 if (gst_value_intersect (&dest_value, val1, val2)) {
2823 gst_structure_id_take_value (idata->dest, id, &dest_value);
2832 gst_structure_intersect_field2 (GQuark id, const GValue * val1, gpointer data)
2834 IntersectData *idata = (IntersectData *) data;
2835 const GValue *val2 = gst_structure_id_get_value (idata->intersect, id);
2837 if (G_UNLIKELY (val2 == NULL)) {
2838 gst_structure_id_set_value (idata->dest, id, val1);
2844 * gst_structure_intersect:
2845 * @struct1: a #GstStructure
2846 * @struct2: a #GstStructure
2848 * Intersects @struct1 and @struct2 and returns the intersection.
2850 * Returns: Intersection of @struct1 and @struct2
2853 gst_structure_intersect (const GstStructure * struct1,
2854 const GstStructure * struct2)
2858 g_assert (struct1 != NULL);
2859 g_assert (struct2 != NULL);
2861 if (G_UNLIKELY (struct1->name != struct2->name))
2864 /* copy fields from struct1 which we have not in struct2 to target
2865 * intersect if we have the field in both */
2866 data.dest = gst_structure_new_id_empty (struct1->name);
2867 data.intersect = struct2;
2868 if (G_UNLIKELY (!gst_structure_foreach ((GstStructure *) struct1,
2869 gst_structure_intersect_field1, &data)))
2872 /* copy fields from struct2 which we have not in struct1 to target */
2873 data.intersect = struct1;
2874 if (G_UNLIKELY (!gst_structure_foreach ((GstStructure *) struct2,
2875 gst_structure_intersect_field2, &data)))
2881 gst_structure_free (data.dest);
2886 gst_caps_structure_can_intersect_field (GQuark id, const GValue * val1,
2889 GstStructure *other = (GstStructure *) data;
2890 const GValue *val2 = gst_structure_id_get_value (other, id);
2892 if (G_LIKELY (val2)) {
2893 if (!gst_value_can_intersect (val1, val2)) {
2896 gint eq = gst_value_compare (val1, val2);
2898 if (eq == GST_VALUE_UNORDERED) {
2899 /* we need to try interseting */
2900 if (!gst_value_intersect (NULL, val1, val2)) {
2903 } else if (eq != GST_VALUE_EQUAL) {
2912 * gst_structure_can_intersect:
2913 * @struct1: a #GstStructure
2914 * @struct2: a #GstStructure
2916 * Tries intersecting @struct1 and @struct2 and reports whether the result
2917 * would not be empty.
2919 * Returns: %TRUE if intersection would not be empty
2922 gst_structure_can_intersect (const GstStructure * struct1,
2923 const GstStructure * struct2)
2925 g_return_val_if_fail (GST_IS_STRUCTURE (struct1), FALSE);
2926 g_return_val_if_fail (GST_IS_STRUCTURE (struct2), FALSE);
2928 if (G_UNLIKELY (struct1->name != struct2->name))
2931 /* tries to intersect if we have the field in both */
2932 return gst_structure_foreach ((GstStructure *) struct1,
2933 gst_caps_structure_can_intersect_field, (gpointer) struct2);
2937 gst_caps_structure_is_superset_field (GQuark field_id, const GValue * value,
2940 GstStructure *subset = user_data;
2941 const GValue *other;
2944 if (!(other = gst_structure_id_get_value (subset, field_id)))
2945 /* field is missing in the subset => no subset */
2948 comparison = gst_value_compare (value, other);
2950 /* equal values are subset */
2951 if (comparison == GST_VALUE_EQUAL)
2954 /* ordered, but unequal, values are not */
2955 if (comparison != GST_VALUE_UNORDERED)
2958 return gst_value_is_subset (other, value);
2962 * gst_structure_is_subset:
2963 * @subset: a #GstStructure
2964 * @superset: a potentially greater #GstStructure
2966 * Checks if @subset is a subset of @superset, i.e. has the same
2967 * structure name and for all fields that are existing in @superset,
2968 * @subset has a value that is a subset of the value in @superset.
2970 * Returns: %TRUE if @subset is a subset of @superset
2973 gst_structure_is_subset (const GstStructure * subset,
2974 const GstStructure * superset)
2976 if ((superset->name != subset->name) ||
2977 (gst_structure_n_fields (superset) > gst_structure_n_fields (subset)))
2980 return gst_structure_foreach ((GstStructure *) superset,
2981 gst_caps_structure_is_superset_field, (gpointer) subset);
2986 * gst_structure_fixate:
2987 * @structure: a #GstStructure
2989 * Fixate all values in @structure using gst_value_fixate().
2990 * @structure will be modified in-place and should be writable.
2993 gst_structure_fixate (GstStructure * structure)
2995 g_return_if_fail (GST_IS_STRUCTURE (structure));
2997 gst_structure_foreach (structure, default_fixate, structure);
3001 _gst_structure_get_any_list (GstStructure * structure, GType type,
3002 const gchar * fieldname, GValueArray ** array)
3004 GstStructureField *field;
3005 GValue val = G_VALUE_INIT;
3007 g_return_val_if_fail (structure != NULL, FALSE);
3008 g_return_val_if_fail (fieldname != NULL, FALSE);
3009 g_return_val_if_fail (array != NULL, FALSE);
3011 field = gst_structure_get_field (structure, fieldname);
3013 if (field == NULL || G_VALUE_TYPE (&field->value) != type)
3016 g_value_init (&val, G_TYPE_VALUE_ARRAY);
3018 if (g_value_transform (&field->value, &val)) {
3019 *array = g_value_get_boxed (&val);
3023 g_value_unset (&val);
3028 * gst_structure_get_array:
3029 * @structure: a #GstStructure
3030 * @fieldname: the name of a field
3031 * @array: (out): a pointer to a #GValueArray
3033 * This is useful in language bindings where unknown #GValue types are not
3034 * supported. This function will convert the %GST_TYPE_ARRAY and
3035 * %GST_TYPE_LIST into a newly allocated #GValueArray and return it through
3036 * @array. Be aware that this is slower then getting the #GValue directly.
3038 * Returns: %TRUE if the value could be set correctly. If there was no field
3039 * with @fieldname or the existing field did not contain an int, this function
3043 gst_structure_get_array (GstStructure * structure, const gchar * fieldname,
3044 GValueArray ** array)
3046 return _gst_structure_get_any_list (structure, GST_TYPE_ARRAY, fieldname,
3051 * gst_structure_get_list:
3052 * @structure: a #GstStructure
3053 * @fieldname: the name of a field
3054 * @array: (out): a pointer to a #GValueArray
3056 * This is useful in language bindings where unknown #GValue types are not
3057 * supported. This function will convert the %GST_TYPE_ARRAY and
3058 * %GST_TYPE_LIST into a newly allocated GValueArray and return it through
3059 * @array. Be aware that this is slower then getting the #GValue directly.
3061 * Returns: %TRUE if the value could be set correctly. If there was no field
3062 * with @fieldname or the existing field did not contain an int, this function
3068 gst_structure_get_list (GstStructure * structure, const gchar * fieldname,
3069 GValueArray ** array)
3071 return _gst_structure_get_any_list (structure, GST_TYPE_LIST, fieldname,
3076 _gst_structure_set_any_list (GstStructure * structure, GType type,
3077 const gchar * fieldname, const GValueArray * array)
3079 GValue arval = G_VALUE_INIT;
3080 GValue value = G_VALUE_INIT;
3082 g_return_if_fail (structure != NULL);
3083 g_return_if_fail (fieldname != NULL);
3084 g_return_if_fail (array != NULL);
3085 g_return_if_fail (IS_MUTABLE (structure));
3087 g_value_init (&value, type);
3088 g_value_init (&arval, G_TYPE_VALUE_ARRAY);
3089 g_value_set_static_boxed (&arval, array);
3091 if (g_value_transform (&arval, &value)) {
3092 gst_structure_id_set_value_internal (structure,
3093 g_quark_from_string (fieldname), &value);
3095 g_warning ("Failed to convert a GValueArray");
3098 g_value_unset (&arval);
3099 g_value_unset (&value);
3103 * gst_structure_set_array:
3104 * @structure: a #GstStructure
3105 * @fieldname: the name of a field
3106 * @array: a pointer to a #GValueArray
3108 * This is useful in language bindings where unknown GValue types are not
3109 * supported. This function will convert a @array to %GST_TYPE_ARRAY and set
3110 * the field specified by @fieldname. Be aware that this is slower then using
3111 * %GST_TYPE_ARRAY in a #GValue directly.
3116 gst_structure_set_array (GstStructure * structure, const gchar * fieldname,
3117 const GValueArray * array)
3119 _gst_structure_set_any_list (structure, GST_TYPE_ARRAY, fieldname, array);
3123 * gst_structure_set_list:
3124 * @structure: a #GstStructure
3125 * @fieldname: the name of a field
3126 * @array: a pointer to a #GValueArray
3128 * This is useful in language bindings where unknown GValue types are not
3129 * supported. This function will convert a @array to %GST_TYPE_ARRAY and set
3130 * the field specified by @fieldname. Be aware that this is slower then using
3131 * %GST_TYPE_ARRAY in a #GValue directly.
3136 gst_structure_set_list (GstStructure * structure, const gchar * fieldname,
3137 const GValueArray * array)
3139 _gst_structure_set_any_list (structure, GST_TYPE_LIST, fieldname, array);