mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-12-19 06:46:38 +00:00
Code Issues 1 Projects Releases Wiki Activity
gstreamer/gst/gststructure.c
Wim Taymans 6c62146031 structure: simplify is_subset check 
Iterate over the fields of the superset instead of those of the subset.
This way we can check the presence of the subset field and do the subset check
in one iteration.
2013-04-04 17:59:10 +02:00

3235 lines
87 KiB
C
Raw Blame History

/* GStreamer
* Copyright (C) 2003 David A. Schleef <ds@schleef.org>
*
* gststructure.c: lists of { GQuark, GValue } tuples
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:gststructure
* @short_description: Generic structure containing fields of names and values
* @see_also: #GstCaps, #GstMessage, #GstEvent, #GstQuery
*
* A #GstStructure is a collection of key/value pairs. The keys are expressed
* as GQuarks and the values can be of any GType.
*
* In addition to the key/value pairs, a #GstStructure also has a name. The name
* starts with a letter and can be filled by letters, numbers and any of "/-_.:".
*
* #GstStructure is used by various GStreamer subsystems to store information
* in a flexible and extensible way. A #GstStructure does not have a refcount
* because it usually is part of a higher level object such as #GstCaps,
* #GstMessage, #GstEvent, #GstQuery. It provides a means to enforce mutability
* using the refcount of the parent with the gst_structure_set_parent_refcount()
* method.
*
* A #GstStructure can be created with gst_structure_new_empty() or
* gst_structure_new(), which both take a name and an optional set of
* key/value pairs along with the types of the values.
*
* Field values can be changed with gst_structure_set_value() or
* gst_structure_set().
*
* Field values can be retrieved with gst_structure_get_value() or the more
* convenient gst_structure_get_*() functions.
*
* Fields can be removed with gst_structure_remove_field() or
* gst_structure_remove_fields().
*
* Strings in structures must be ASCII or UTF-8 encoded. Other encodings are
* not allowed. Strings must not be empty either, but may be NULL.
*
* Last reviewed on 2012-03-29 (0.11.3)
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "gst_private.h"
#include "gstquark.h"
#include <gst/gst.h>
#include <gobject/gvaluecollector.h>
GST_DEBUG_CATEGORY_STATIC (gst_structure_debug);
#define GST_CAT_DEFAULT gst_structure_debug
typedef struct _GstStructureField GstStructureField;
struct _GstStructureField
{
GQuark name;
GValue value;
};
typedef struct
{
GstStructure s;
/* owned by parent structure, NULL if no parent */
gint *parent_refcount;
GArray *fields;
} GstStructureImpl;
#define GST_STRUCTURE_REFCOUNT(s) (((GstStructureImpl*)(s))->parent_refcount)
#define GST_STRUCTURE_FIELDS(s) (((GstStructureImpl*)(s))->fields)
#define GST_STRUCTURE_FIELD(structure, index) \
&g_array_index(GST_STRUCTURE_FIELDS(structure), GstStructureField, (index))
#define IS_MUTABLE(structure) \
(!GST_STRUCTURE_REFCOUNT(structure) || \
g_atomic_int_get (GST_STRUCTURE_REFCOUNT(structure)) == 1)
#define IS_TAGLIST(structure) \
(structure->name == GST_QUARK (TAGLIST))
static void gst_structure_set_field (GstStructure * structure,
GstStructureField * field);
static GstStructureField *gst_structure_get_field (const GstStructure *
structure, const gchar * fieldname);
static GstStructureField *gst_structure_id_get_field (const GstStructure *
structure, GQuark field);
static void gst_structure_transform_to_string (const GValue * src_value,
GValue * dest_value);
static GstStructure *gst_structure_copy_conditional (const GstStructure *
structure);
static gboolean gst_structure_parse_value (gchar * str, gchar ** after,
GValue * value, GType default_type);
static gboolean gst_structure_parse_simple_string (gchar * s, gchar ** end);
GType _gst_structure_type = 0;
G_DEFINE_BOXED_TYPE (GstStructure, gst_structure,
gst_structure_copy_conditional, gst_structure_free);
void
_priv_gst_structure_initialize (void)
{
_gst_structure_type = gst_structure_get_type ();
g_value_register_transform_func (_gst_structure_type, G_TYPE_STRING,
gst_structure_transform_to_string);
GST_DEBUG_CATEGORY_INIT (gst_structure_debug, "structure", 0,
"GstStructure debug");
}
static GstStructure *
gst_structure_new_id_empty_with_size (GQuark quark, guint prealloc)
{
GstStructureImpl *structure;
structure = g_slice_new (GstStructureImpl);
((GstStructure *) structure)->type = _gst_structure_type;
((GstStructure *) structure)->name = quark;
GST_STRUCTURE_REFCOUNT (structure) = NULL;
GST_STRUCTURE_FIELDS (structure) =
g_array_sized_new (FALSE, FALSE, sizeof (GstStructureField), prealloc);
GST_TRACE ("created structure %p", structure);
return GST_STRUCTURE_CAST (structure);
}
/**
* gst_structure_new_id_empty:
* @quark: name of new structure
*
* Creates a new, empty #GstStructure with the given name as a GQuark.
*
* Free-function: gst_structure_free
*
* Returns: (transfer full): a new, empty #GstStructure
*/
GstStructure *
gst_structure_new_id_empty (GQuark quark)
{
g_return_val_if_fail (quark != 0, NULL);
return gst_structure_new_id_empty_with_size (quark, 0);
}
#ifndef G_DISABLE_CHECKS
static gboolean
gst_structure_validate_name (const gchar * name)
{
const gchar *s;
g_return_val_if_fail (name != NULL, FALSE);
if (G_UNLIKELY (!g_ascii_isalpha (*name))) {
GST_WARNING ("Invalid character '%c' at offset 0 in structure name: %s",
*name, name);
return FALSE;
}
/* FIXME: test name string more */
s = &name[1];
while (*s && (g_ascii_isalnum (*s) || strchr ("/-_.:+", *s) != NULL))
s++;
if (G_UNLIKELY (*s != '\0')) {
GST_WARNING ("Invalid character '%c' at offset %" G_GUINTPTR_FORMAT " in"
" structure name: %s", *s, ((guintptr) s - (guintptr) name), name);
return FALSE;
}
if (strncmp (name, "video/x-raw-", 12) == 0) {
g_warning ("0.10-style raw video caps are being created. Should be "
"video/x-raw,format=(string).. now.");
} else if (strncmp (name, "audio/x-raw-", 12) == 0) {
g_warning ("0.10-style raw audio caps are being created. Should be "
"audio/x-raw,format=(string).. now.");
}
return TRUE;
}
#endif
/**
* gst_structure_new_empty:
* @name: name of new structure
*
* Creates a new, empty #GstStructure with the given @name.
*
* See gst_structure_set_name() for constraints on the @name parameter.
*
* Free-function: gst_structure_free
*
* Returns: (transfer full): a new, empty #GstStructure
*/
GstStructure *
gst_structure_new_empty (const gchar * name)
{
g_return_val_if_fail (gst_structure_validate_name (name), NULL);
return gst_structure_new_id_empty_with_size (g_quark_from_string (name), 0);
}
/**
* gst_structure_new:
* @name: name of new structure
* @firstfield: name of first field to set
* @...: additional arguments
*
* Creates a new #GstStructure with the given name. Parses the
* list of variable arguments and sets fields to the values listed.
* Variable arguments should be passed as field name, field type,
* and value. Last variable argument should be NULL.
*
* Free-function: gst_structure_free
*
* Returns: (transfer full): a new #GstStructure
*/
GstStructure *
gst_structure_new (const gchar * name, const gchar * firstfield, ...)
{
GstStructure *structure;
va_list varargs;
va_start (varargs, firstfield);
structure = gst_structure_new_valist (name, firstfield, varargs);
va_end (varargs);
return structure;
}
/**
* gst_structure_new_valist:
* @name: name of new structure
* @firstfield: name of first field to set
* @varargs: variable argument list
*
* Creates a new #GstStructure with the given @name. Structure fields
* are set according to the varargs in a manner similar to
* gst_structure_new().
*
* See gst_structure_set_name() for constraints on the @name parameter.
*
* Free-function: gst_structure_free
*
* Returns: (transfer full): a new #GstStructure
*/
GstStructure *
gst_structure_new_valist (const gchar * name,
const gchar * firstfield, va_list varargs)
{
GstStructure *structure;
structure = gst_structure_new_empty (name);
if (structure)
gst_structure_set_valist (structure, firstfield, varargs);
return structure;
}
/**
* gst_structure_set_parent_refcount:
* @structure: a #GstStructure
* @refcount: (in): a pointer to the parent's refcount
*
* Sets the parent_refcount field of #GstStructure. This field is used to
* determine whether a structure is mutable or not. This function should only be
* called by code implementing parent objects of #GstStructure, as described in
* the MT Refcounting section of the design documents.
*
* Returns: %TRUE if the parent refcount could be set.
*/
gboolean
gst_structure_set_parent_refcount (GstStructure * structure, gint * refcount)
{
g_return_val_if_fail (structure != NULL, FALSE);
/* if we have a parent_refcount already, we can only clear
* if with a NULL refcount */
if (GST_STRUCTURE_REFCOUNT (structure)) {
if (refcount != NULL) {
g_return_val_if_fail (refcount == NULL, FALSE);
return FALSE;
}
} else {
if (refcount == NULL) {
g_return_val_if_fail (refcount != NULL, FALSE);
return FALSE;
}
}
GST_STRUCTURE_REFCOUNT (structure) = refcount;
return TRUE;
}
/**
* gst_structure_copy:
* @structure: a #GstStructure to duplicate
*
* Duplicates a #GstStructure and all its fields and values.
*
* Free-function: gst_structure_free
*
* Returns: (transfer full): a new #GstStructure.
*/
GstStructure *
gst_structure_copy (const GstStructure * structure)
{
GstStructure *new_structure;
GstStructureField *field;
guint i, len;
g_return_val_if_fail (structure != NULL, NULL);
len = GST_STRUCTURE_FIELDS (structure)->len;
new_structure = gst_structure_new_id_empty_with_size (structure->name, len);
for (i = 0; i < len; i++) {
GstStructureField new_field = { 0 };
field = GST_STRUCTURE_FIELD (structure, i);
new_field.name = field->name;
gst_value_init_and_copy (&new_field.value, &field->value);
g_array_append_val (GST_STRUCTURE_FIELDS (new_structure), new_field);
}
GST_CAT_TRACE (GST_CAT_PERFORMANCE, "doing copy %p -> %p",
structure, new_structure);
return new_structure;
}
/**
* gst_structure_free:
* @structure: (in) (transfer full): the #GstStructure to free
*
* Frees a #GstStructure and all its fields and values. The structure must not
* have a parent when this function is called.
*/
void
gst_structure_free (GstStructure * structure)
{
GstStructureField *field;
guint i, len;
g_return_if_fail (structure != NULL);
g_return_if_fail (GST_STRUCTURE_REFCOUNT (structure) == NULL);
len = GST_STRUCTURE_FIELDS (structure)->len;
for (i = 0; i < len; i++) {
field = GST_STRUCTURE_FIELD (structure, i);
if (G_IS_VALUE (&field->value)) {
g_value_unset (&field->value);
}
}
g_array_free (GST_STRUCTURE_FIELDS (structure), TRUE);
#ifdef USE_POISONING
memset (structure, 0xff, sizeof (GstStructure));
#endif
GST_TRACE ("free structure %p", structure);
g_slice_free1 (sizeof (GstStructureImpl), structure);
}
/**
* gst_structure_get_name:
* @structure: a #GstStructure
*
* Get the name of @structure as a string.
*
* Returns: the name of the structure.
*/
const gchar *
gst_structure_get_name (const GstStructure * structure)
{
g_return_val_if_fail (structure != NULL, NULL);
return g_quark_to_string (structure->name);
}
/**
* gst_structure_has_name:
* @structure: a #GstStructure
* @name: structure name to check for
*
* Checks if the structure has the given name
*
* Returns: TRUE if @name matches the name of the structure.
*/
gboolean
gst_structure_has_name (const GstStructure * structure, const gchar * name)
{
const gchar *structure_name;
g_return_val_if_fail (structure != NULL, FALSE);
g_return_val_if_fail (name != NULL, FALSE);
/* getting the string is cheap and comparing short strings is too
* should be faster than getting the quark for name and comparing the quarks
*/
structure_name = g_quark_to_string (structure->name);
return (structure_name && strcmp (structure_name, name) == 0);
}
/**
* gst_structure_get_name_id:
* @structure: a #GstStructure
*
* Get the name of @structure as a GQuark.
*
* Returns: the quark representing the name of the structure.
*/
GQuark
gst_structure_get_name_id (const GstStructure * structure)
{
g_return_val_if_fail (structure != NULL, 0);
return structure->name;
}
/**
* gst_structure_set_name:
* @structure: a #GstStructure
* @name: the new name of the structure
*
* Sets the name of the structure to the given @name. The string
* provided is copied before being used. It must not be empty, start with a
* letter and can be followed by letters, numbers and any of "/-_.:".
*/
void
gst_structure_set_name (GstStructure * structure, const gchar * name)
{
g_return_if_fail (structure != NULL);
g_return_if_fail (IS_MUTABLE (structure));
g_return_if_fail (gst_structure_validate_name (name));
structure->name = g_quark_from_string (name);
}
static inline void
gst_structure_id_set_value_internal (GstStructure * structure, GQuark field,
const GValue * value)
{
GstStructureField gsfield = { 0, {0,} };
gsfield.name = field;
gst_value_init_and_copy (&gsfield.value, value);
gst_structure_set_field (structure, &gsfield);
}
/**
* gst_structure_id_set_value:
* @structure: a #GstStructure
* @field: a #GQuark representing a field
* @value: the new value of the field
*
* Sets the field with the given GQuark @field to @value. If the field
* does not exist, it is created. If the field exists, the previous
* value is replaced and freed.
*/
void
gst_structure_id_set_value (GstStructure * structure,
GQuark field, const GValue * value)
{
g_return_if_fail (structure != NULL);
g_return_if_fail (G_IS_VALUE (value));
g_return_if_fail (IS_MUTABLE (structure));
gst_structure_id_set_value_internal (structure, field, value);
}
/**
* gst_structure_set_value:
* @structure: a #GstStructure
* @fieldname: the name of the field to set
* @value: the new value of the field
*
* Sets the field with the given name @field to @value. If the field
* does not exist, it is created. If the field exists, the previous
* value is replaced and freed.
*/
void
gst_structure_set_value (GstStructure * structure,
const gchar * fieldname, const GValue * value)
{
g_return_if_fail (structure != NULL);
g_return_if_fail (fieldname != NULL);
g_return_if_fail (G_IS_VALUE (value));
g_return_if_fail (IS_MUTABLE (structure));
gst_structure_id_set_value_internal (structure,
g_quark_from_string (fieldname), value);
}
static inline void
gst_structure_id_take_value_internal (GstStructure * structure, GQuark field,
GValue * value)
{
GstStructureField gsfield = { 0, {0,} };
gsfield.name = field;
gsfield.value = *value;
gst_structure_set_field (structure, &gsfield);
/* we took ownership */
#ifdef USE_POISONING
memset (value, 0, sizeof (GValue));
#else
value->g_type = G_TYPE_INVALID;
#endif
}
/**
* gst_structure_id_take_value:
* @structure: a #GstStructure
* @field: a #GQuark representing a field
* @value: (transfer full): the new value of the field
*
* Sets the field with the given GQuark @field to @value. If the field
* does not exist, it is created. If the field exists, the previous
* value is replaced and freed.
*/
void
gst_structure_id_take_value (GstStructure * structure, GQuark field,
GValue * value)
{
g_return_if_fail (structure != NULL);
g_return_if_fail (G_IS_VALUE (value));
g_return_if_fail (IS_MUTABLE (structure));
gst_structure_id_take_value_internal (structure, field, value);
}
/**
* gst_structure_take_value:
* @structure: a #GstStructure
* @fieldname: the name of the field to set
* @value: (transfer full): the new value of the field
*
* Sets the field with the given name @field to @value. If the field
* does not exist, it is created. If the field exists, the previous
* value is replaced and freed. The function will take ownership of @value.
*/
void
gst_structure_take_value (GstStructure * structure, const gchar * fieldname,
GValue * value)
{
g_return_if_fail (structure != NULL);
g_return_if_fail (fieldname != NULL);
g_return_if_fail (G_IS_VALUE (value));
g_return_if_fail (IS_MUTABLE (structure));
gst_structure_id_take_value_internal (structure,
g_quark_from_string (fieldname), value);
}
static void
gst_structure_set_valist_internal (GstStructure * structure,
const gchar * fieldname, va_list varargs)
{
gchar *err = NULL;
GType type;
while (fieldname) {
GstStructureField field = { 0 };
field.name = g_quark_from_string (fieldname);
type = va_arg (varargs, GType);
G_VALUE_COLLECT_INIT (&field.value, type, varargs, 0, &err);
if (G_UNLIKELY (err)) {
g_critical ("%s", err);
return;
}
gst_structure_set_field (structure, &field);
fieldname = va_arg (varargs, gchar *);
}
}
/**
* gst_structure_set:
* @structure: a #GstStructure
* @fieldname: the name of the field to set
* @...: variable arguments
*
* Parses the variable arguments and sets fields accordingly.
* Variable arguments should be in the form field name, field type
* (as a GType), value(s). The last variable argument should be NULL.
*/
void
gst_structure_set (GstStructure * structure, const gchar * field, ...)
{
va_list varargs;
g_return_if_fail (structure != NULL);
g_return_if_fail (IS_MUTABLE (structure) || field == NULL);
va_start (varargs, field);
gst_structure_set_valist_internal (structure, field, varargs);
va_end (varargs);
}
/**
* gst_structure_set_valist:
* @structure: a #GstStructure
* @fieldname: the name of the field to set
* @varargs: variable arguments
*
* va_list form of gst_structure_set().
*/
void
gst_structure_set_valist (GstStructure * structure,
const gchar * fieldname, va_list varargs)
{
g_return_if_fail (structure != NULL);
g_return_if_fail (IS_MUTABLE (structure));
gst_structure_set_valist_internal (structure, fieldname, varargs);
}
static void
gst_structure_id_set_valist_internal (GstStructure * structure,
GQuark fieldname, va_list varargs)
{
gchar *err = NULL;
GType type;
while (fieldname) {
GstStructureField field = { 0 };
field.name = fieldname;
type = va_arg (varargs, GType);
#ifndef G_VALUE_COLLECT_INIT
g_value_init (&field.value, type);
G_VALUE_COLLECT (&field.value, varargs, 0, &err);
#else
G_VALUE_COLLECT_INIT (&field.value, type, varargs, 0, &err);
#endif
if (G_UNLIKELY (err)) {
g_critical ("%s", err);
return;
}
gst_structure_set_field (structure, &field);
fieldname = va_arg (varargs, GQuark);
}
}
/**
* gst_structure_id_set:
* @structure: a #GstStructure
* @fieldname: the GQuark for the name of the field to set
* @...: variable arguments
*
* Identical to gst_structure_set, except that field names are
* passed using the GQuark for the field name. This allows more efficient
* setting of the structure if the caller already knows the associated
* quark values.
* The last variable argument must be NULL.
*/
void
gst_structure_id_set (GstStructure * structure, GQuark field, ...)
{
va_list varargs;
g_return_if_fail (structure != NULL);
va_start (varargs, field);
gst_structure_id_set_valist_internal (structure, field, varargs);
va_end (varargs);
}
/**
* gst_structure_id_set_valist:
* @structure: a #GstStructure
* @fieldname: the name of the field to set
* @varargs: variable arguments
*
* va_list form of gst_structure_id_set().
*/
void
gst_structure_id_set_valist (GstStructure * structure,
GQuark fieldname, va_list varargs)
{
g_return_if_fail (structure != NULL);
g_return_if_fail (IS_MUTABLE (structure));
gst_structure_id_set_valist_internal (structure, fieldname, varargs);
}
/**
* gst_structure_new_id:
* @name_quark: name of new structure
* @field_quark: the GQuark for the name of the field to set
* @...: variable arguments
*
* Creates a new #GstStructure with the given name as a GQuark, followed by
* fieldname quark, GType, argument(s) "triplets" in the same format as
* gst_structure_id_set(). Basically a convenience wrapper around
* gst_structure_new_id_empty() and gst_structure_id_set().
*
* The last variable argument must be NULL (or 0).
*
* Free-function: gst_structure_free
*
* Returns: (transfer full): a new #GstStructure
*/
GstStructure *
gst_structure_new_id (GQuark name_quark, GQuark field_quark, ...)
{
GstStructure *s;
va_list varargs;
g_return_val_if_fail (name_quark != 0, NULL);
g_return_val_if_fail (field_quark != 0, NULL);
s = gst_structure_new_id_empty (name_quark);
va_start (varargs, field_quark);
gst_structure_id_set_valist_internal (s, field_quark, varargs);
va_end (varargs);
return s;
}
#if GST_VERSION_NANO == 1
#define GIT_G_WARNING g_warning
#else
#define GIT_G_WARNING GST_WARNING
#endif
/* If the structure currently contains a field with the same name, it is
* replaced with the provided field. Otherwise, the field is added to the
* structure. The field's value is not deeply copied.
*/
static void
gst_structure_set_field (GstStructure * structure, GstStructureField * field)
{
GstStructureField *f;
guint i, len = GST_STRUCTURE_FIELDS (structure)->len;
if (G_UNLIKELY (G_VALUE_HOLDS_STRING (&field->value))) {
const gchar *s;
s = g_value_get_string (&field->value);
/* only check for NULL strings in taglists, as they are allowed in message
* structs, e.g. error message debug strings */
if (G_UNLIKELY (IS_TAGLIST (structure) && (s == NULL || *s == '\0'))) {
if (s == NULL) {
GIT_G_WARNING ("Trying to set NULL string on field '%s' on taglist. "
"Please file a bug.", g_quark_to_string (field->name));
g_value_unset (&field->value);
return;
} else {
/* empty strings never make sense */
GIT_G_WARNING ("Trying to set empty string on taglist field '%s'. "
"Please file a bug.", g_quark_to_string (field->name));
g_value_unset (&field->value);
return;
}
} else if (G_UNLIKELY (s != NULL && !g_utf8_validate (s, -1, NULL))) {
g_warning ("Trying to set string on %s field '%s', but string is not "
"valid UTF-8. Please file a bug.",
IS_TAGLIST (structure) ? "taglist" : "structure",
g_quark_to_string (field->name));
g_value_unset (&field->value);
return;
}
} else if (G_UNLIKELY (G_VALUE_HOLDS (&field->value, G_TYPE_DATE))) {
const GDate *d;
d = g_value_get_boxed (&field->value);
/* only check for NULL GDates in taglists, as they might make sense
* in other, generic structs */
if (G_UNLIKELY ((IS_TAGLIST (structure) && d == NULL))) {
GIT_G_WARNING ("Trying to set NULL GDate on field '%s' on taglist. "
"Please file a bug.", g_quark_to_string (field->name));
g_value_unset (&field->value);
return;
} else if (G_UNLIKELY (d != NULL && !g_date_valid (d))) {
g_warning
("Trying to set invalid GDate on %s field '%s'. Please file a bug.",
IS_TAGLIST (structure) ? "taglist" : "structure",
g_quark_to_string (field->name));
g_value_unset (&field->value);
return;
}
}
for (i = 0; i < len; i++) {
f = GST_STRUCTURE_FIELD (structure, i);
if (G_UNLIKELY (f->name == field->name)) {
g_value_unset (&f->value);
memcpy (f, field, sizeof (GstStructureField));
return;
}
}
g_array_append_val (GST_STRUCTURE_FIELDS (structure), *field);
}
/* If there is no field with the given ID, NULL is returned.
*/
static GstStructureField *
gst_structure_id_get_field (const GstStructure * structure, GQuark field_id)
{
GstStructureField *field;
guint i, len;
len = GST_STRUCTURE_FIELDS (structure)->len;
for (i = 0; i < len; i++) {
field = GST_STRUCTURE_FIELD (structure, i);
if (G_UNLIKELY (field->name == field_id))
return field;
}
return NULL;
}
/* If there is no field with the given ID, NULL is returned.
*/
static GstStructureField *
gst_structure_get_field (const GstStructure * structure,
const gchar * fieldname)
{
g_return_val_if_fail (structure != NULL, NULL);
g_return_val_if_fail (fieldname != NULL, NULL);
return gst_structure_id_get_field (structure,
g_quark_from_string (fieldname));
}
/**
* gst_structure_get_value:
* @structure: a #GstStructure
* @fieldname: the name of the field to get
*
* Get the value of the field with name @fieldname.
*
* Returns: the #GValue corresponding to the field with the given name.
*/
const GValue *
gst_structure_get_value (const GstStructure * structure,
const gchar * fieldname)
{
GstStructureField *field;
g_return_val_if_fail (structure != NULL, NULL);
g_return_val_if_fail (fieldname != NULL, NULL);
field = gst_structure_get_field (structure, fieldname);
if (field == NULL)
return NULL;
return &field->value;
}
/**
* gst_structure_id_get_value:
* @structure: a #GstStructure
* @field: the #GQuark of the field to get
*
* Get the value of the field with GQuark @field.
*
* Returns: the #GValue corresponding to the field with the given name
* identifier.
*/
const GValue *
gst_structure_id_get_value (const GstStructure * structure, GQuark field)
{
GstStructureField *gsfield;
g_return_val_if_fail (structure != NULL, NULL);
gsfield = gst_structure_id_get_field (structure, field);
if (gsfield == NULL)
return NULL;
return &gsfield->value;
}
/**
* gst_structure_remove_field:
* @structure: a #GstStructure
* @fieldname: the name of the field to remove
*
* Removes the field with the given name. If the field with the given
* name does not exist, the structure is unchanged.
*/
void
gst_structure_remove_field (GstStructure * structure, const gchar * fieldname)
{
GstStructureField *field;
GQuark id;
guint i, len;
g_return_if_fail (structure != NULL);
g_return_if_fail (fieldname != NULL);
g_return_if_fail (IS_MUTABLE (structure));
id = g_quark_from_string (fieldname);
len = GST_STRUCTURE_FIELDS (structure)->len;
for (i = 0; i < len; i++) {
field = GST_STRUCTURE_FIELD (structure, i);
if (field->name == id) {
if (G_IS_VALUE (&field->value)) {
g_value_unset (&field->value);
}
GST_STRUCTURE_FIELDS (structure) =
g_array_remove_index (GST_STRUCTURE_FIELDS (structure), i);
return;
}
}
}
/**
* gst_structure_remove_fields:
* @structure: a #GstStructure
* @fieldname: the name of the field to remove
* @...: NULL-terminated list of more fieldnames to remove
*
* Removes the fields with the given names. If a field does not exist, the
* argument is ignored.
*/
void
gst_structure_remove_fields (GstStructure * structure,
const gchar * fieldname, ...)
{
va_list varargs;
g_return_if_fail (structure != NULL);
g_return_if_fail (fieldname != NULL);
/* mutability checked in remove_field */
va_start (varargs, fieldname);
gst_structure_remove_fields_valist (structure, fieldname, varargs);
va_end (varargs);
}
/**
* gst_structure_remove_fields_valist:
* @structure: a #GstStructure
* @fieldname: the name of the field to remove
* @varargs: NULL-terminated list of more fieldnames to remove
*
* va_list form of gst_structure_remove_fields().
*/
void
gst_structure_remove_fields_valist (GstStructure * structure,
const gchar * fieldname, va_list varargs)
{
gchar *field = (gchar *) fieldname;
g_return_if_fail (structure != NULL);
g_return_if_fail (fieldname != NULL);
/* mutability checked in remove_field */
while (field) {
gst_structure_remove_field (structure, field);
field = va_arg (varargs, char *);
}
}
/**
* gst_structure_remove_all_fields:
* @structure: a #GstStructure
*
* Removes all fields in a GstStructure.
*/
void
gst_structure_remove_all_fields (GstStructure * structure)
{
GstStructureField *field;
int i;
g_return_if_fail (structure != NULL);
g_return_if_fail (IS_MUTABLE (structure));
for (i = GST_STRUCTURE_FIELDS (structure)->len - 1; i >= 0; i--) {
field = GST_STRUCTURE_FIELD (structure, i);
if (G_IS_VALUE (&field->value)) {
g_value_unset (&field->value);
}
GST_STRUCTURE_FIELDS (structure) =
g_array_remove_index (GST_STRUCTURE_FIELDS (structure), i);
}
}
/**
* gst_structure_get_field_type:
* @structure: a #GstStructure
* @fieldname: the name of the field
*
* Finds the field with the given name, and returns the type of the
* value it contains. If the field is not found, G_TYPE_INVALID is
* returned.
*
* Returns: the #GValue of the field
*/
GType
gst_structure_get_field_type (const GstStructure * structure,
const gchar * fieldname)
{
GstStructureField *field;
g_return_val_if_fail (structure != NULL, G_TYPE_INVALID);
g_return_val_if_fail (fieldname != NULL, G_TYPE_INVALID);
field = gst_structure_get_field (structure, fieldname);
if (field == NULL)
return G_TYPE_INVALID;
return G_VALUE_TYPE (&field->value);
}
/**
* gst_structure_n_fields:
* @structure: a #GstStructure
*
* Get the number of fields in the structure.
*
* Returns: the number of fields in the structure
*/
gint
gst_structure_n_fields (const GstStructure * structure)
{
g_return_val_if_fail (structure != NULL, 0);
return GST_STRUCTURE_FIELDS (structure)->len;
}
/**
* gst_structure_nth_field_name:
* @structure: a #GstStructure
* @index: the index to get the name of
*
* Get the name of the given field number, counting from 0 onwards.
*
* Returns: the name of the given field number
*/
const gchar *
gst_structure_nth_field_name (const GstStructure * structure, guint index)
{
GstStructureField *field;
g_return_val_if_fail (structure != NULL, NULL);
g_return_val_if_fail (index < GST_STRUCTURE_FIELDS (structure)->len, NULL);
field = GST_STRUCTURE_FIELD (structure, index);
return g_quark_to_string (field->name);
}
/**
* gst_structure_foreach:
* @structure: a #GstStructure
* @func: (scope call): a function to call for each field
* @user_data: (closure): private data
*
* Calls the provided function once for each field in the #GstStructure. The
* function must not modify the fields. Also see gst_structure_map_in_place().
*
* Returns: TRUE if the supplied function returns TRUE For each of the fields,
* FALSE otherwise.
*/
gboolean
gst_structure_foreach (const GstStructure * structure,
GstStructureForeachFunc func, gpointer user_data)
{
guint i, len;
GstStructureField *field;
gboolean ret;
g_return_val_if_fail (structure != NULL, FALSE);
g_return_val_if_fail (func != NULL, FALSE);
len = GST_STRUCTURE_FIELDS (structure)->len;
for (i = 0; i < len; i++) {
field = GST_STRUCTURE_FIELD (structure, i);
ret = func (field->name, &field->value, user_data);
if (G_UNLIKELY (!ret))
return FALSE;
}
return TRUE;
}
/**
* gst_structure_map_in_place:
* @structure: a #GstStructure
* @func: (scope call): a function to call for each field
* @user_data: (closure): private data
*
* Calls the provided function once for each field in the #GstStructure. In
* contrast to gst_structure_foreach(), the function may modify but not delete the
* fields. The structure must be mutable.
*
* Returns: TRUE if the supplied function returns TRUE For each of the fields,
* FALSE otherwise.
*/
gboolean
gst_structure_map_in_place (GstStructure * structure,
GstStructureMapFunc func, gpointer user_data)
{
guint i, len;
GstStructureField *field;
gboolean ret;
g_return_val_if_fail (structure != NULL, FALSE);
g_return_val_if_fail (IS_MUTABLE (structure), FALSE);
g_return_val_if_fail (func != NULL, FALSE);
len = GST_STRUCTURE_FIELDS (structure)->len;
for (i = 0; i < len; i++) {
field = GST_STRUCTURE_FIELD (structure, i);
ret = func (field->name, &field->value, user_data);
if (!ret)
return FALSE;
}
return TRUE;
}
/**
* gst_structure_id_has_field:
* @structure: a #GstStructure
* @field: #GQuark of the field name
*
* Check if @structure contains a field named @field.
*
* Returns: TRUE if the structure contains a field with the given name
*/
gboolean
gst_structure_id_has_field (const GstStructure * structure, GQuark field)
{
GstStructureField *f;
g_return_val_if_fail (structure != NULL, FALSE);
g_return_val_if_fail (field != 0, FALSE);
f = gst_structure_id_get_field (structure, field);
return (f != NULL);
}
/**
* gst_structure_has_field:
* @structure: a #GstStructure
* @fieldname: the name of a field
*
* Check if @structure contains a field named @fieldname.
*
* Returns: TRUE if the structure contains a field with the given name
*/
gboolean
gst_structure_has_field (const GstStructure * structure,
const gchar * fieldname)
{
g_return_val_if_fail (structure != NULL, FALSE);
g_return_val_if_fail (fieldname != NULL, FALSE);
return gst_structure_id_has_field (structure,
g_quark_from_string (fieldname));
}
/**
* gst_structure_id_has_field_typed:
* @structure: a #GstStructure
* @field: #GQuark of the field name
* @type: the type of a value
*
* Check if @structure contains a field named @field and with GType @type.
*
* Returns: TRUE if the structure contains a field with the given name and type
*/
gboolean
gst_structure_id_has_field_typed (const GstStructure * structure,
GQuark field, GType type)
{
GstStructureField *f;
g_return_val_if_fail (structure != NULL, FALSE);
g_return_val_if_fail (field != 0, FALSE);
f = gst_structure_id_get_field (structure, field);
if (f == NULL)
return FALSE;
return (G_VALUE_TYPE (&f->value) == type);
}
/**
* gst_structure_has_field_typed:
* @structure: a #GstStructure
* @fieldname: the name of a field
* @type: the type of a value
*
* Check if @structure contains a field named @fieldname and with GType @type.
*
* Returns: TRUE if the structure contains a field with the given name and type
*/
gboolean
gst_structure_has_field_typed (const GstStructure * structure,
const gchar * fieldname, GType type)
{
g_return_val_if_fail (structure != NULL, FALSE);
g_return_val_if_fail (fieldname != NULL, FALSE);
return gst_structure_id_has_field_typed (structure,
g_quark_from_string (fieldname), type);
}
/* utility functions */
/**
* gst_structure_get_boolean:
* @structure: a #GstStructure
* @fieldname: the name of a field
* @value: (out): a pointer to a #gboolean to set
*
* Sets the boolean pointed to by @value corresponding to the value of the
* given field. Caller is responsible for making sure the field exists
* and has the correct type.
*
* Returns: TRUE if the value could be set correctly. If there was no field
* with @fieldname or the existing field did not contain a boolean, this
* function returns FALSE.
*/
gboolean
gst_structure_get_boolean (const GstStructure * structure,
const gchar * fieldname, gboolean * value)
{
GstStructureField *field;
g_return_val_if_fail (structure != NULL, FALSE);
g_return_val_if_fail (fieldname != NULL, FALSE);
field = gst_structure_get_field (structure, fieldname);
if (field == NULL)
return FALSE;
if (!G_VALUE_HOLDS_BOOLEAN (&field->value))
return FALSE;
*value = gst_g_value_get_boolean_unchecked (&field->value);
return TRUE;
}
/**
* gst_structure_get_int:
* @structure: a #GstStructure
* @fieldname: the name of a field
* @value: (out): a pointer to an int to set
*
* Sets the int pointed to by @value corresponding to the value of the
* given field. Caller is responsible for making sure the field exists
* and has the correct type.
*
* Returns: %TRUE if the value could be set correctly. If there was no field
* with @fieldname or the existing field did not contain an int, this function
* returns %FALSE.
*/
gboolean
gst_structure_get_int (const GstStructure * structure,
const gchar * fieldname, gint * value)
{
GstStructureField *field;
g_return_val_if_fail (structure != NULL, FALSE);
g_return_val_if_fail (fieldname != NULL, FALSE);
g_return_val_if_fail (value != NULL, FALSE);
field = gst_structure_get_field (structure, fieldname);
if (field == NULL)
return FALSE;
if (!G_VALUE_HOLDS_INT (&field->value))
return FALSE;
*value = gst_g_value_get_int_unchecked (&field->value);
return TRUE;
}
/**
* gst_structure_get_uint:
* @structure: a #GstStructure
* @fieldname: the name of a field
* @value: (out): a pointer to a uint to set
*
* Sets the uint pointed to by @value corresponding to the value of the
* given field. Caller is responsible for making sure the field exists
* and has the correct type.
*
* Returns: %TRUE if the value could be set correctly. If there was no field
* with @fieldname or the existing field did not contain a uint, this function
* returns %FALSE.
*/
gboolean
gst_structure_get_uint (const GstStructure * structure,
const gchar * fieldname, guint * value)
{
GstStructureField *field;
g_return_val_if_fail (structure != NULL, FALSE);
g_return_val_if_fail (fieldname != NULL, FALSE);
g_return_val_if_fail (value != NULL, FALSE);
field = gst_structure_get_field (structure, fieldname);
if (field == NULL)
return FALSE;
if (!G_VALUE_HOLDS_UINT (&field->value))
return FALSE;
*value = gst_g_value_get_uint_unchecked (&field->value);
return TRUE;
}
/**
* gst_structure_get_date:
* @structure: a #GstStructure
* @fieldname: the name of a field
* @value: (out callee-allocates): a pointer to a #GDate to set
*
* Sets the date pointed to by @value corresponding to the date of the
* given field. Caller is responsible for making sure the field exists
* and has the correct type.
*
* On success @value will point to a newly-allocated copy of the date which
* should be freed with g_date_free() when no longer needed (note: this is
* inconsistent with e.g. gst_structure_get_string() which doesn't return a
* copy of the string).
*
* Returns: TRUE if the value could be set correctly. If there was no field
* with @fieldname or the existing field did not contain a data, this function
* returns FALSE.
*/
gboolean
gst_structure_get_date (const GstStructure * structure, const gchar * fieldname,
GDate ** value)
{
GstStructureField *field;
g_return_val_if_fail (structure != NULL, FALSE);
g_return_val_if_fail (fieldname != NULL, FALSE);
g_return_val_if_fail (value != NULL, FALSE);
field = gst_structure_get_field (structure, fieldname);
if (field == NULL)
return FALSE;
if (!G_VALUE_HOLDS (&field->value, G_TYPE_DATE))
return FALSE;
/* FIXME: 0.11 g_value_dup_boxed() -> g_value_get_boxed() */
*value = g_value_dup_boxed (&field->value);
return TRUE;
}
/**
* gst_structure_get_date_time:
* @structure: a #GstStructure
* @fieldname: the name of a field
* @value: (out callee-allocates): a pointer to a #GstDateTime to set
*
* Sets the datetime pointed to by @value corresponding to the datetime of the
* given field. Caller is responsible for making sure the field exists
* and has the correct type.
*
* On success @value will point to a reference of the datetime which
* should be unreffed with gst_date_time_unref() when no longer needed
* (note: this is inconsistent with e.g. gst_structure_get_string()
* which doesn't return a copy of the string).
*
* Returns: TRUE if the value could be set correctly. If there was no field
* with @fieldname or the existing field did not contain a data, this function
* returns FALSE.
*/
gboolean
gst_structure_get_date_time (const GstStructure * structure,
const gchar * fieldname, GstDateTime ** value)
{
GstStructureField *field;
g_return_val_if_fail (structure != NULL, FALSE);
g_return_val_if_fail (fieldname != NULL, FALSE);
g_return_val_if_fail (value != NULL, FALSE);
field = gst_structure_get_field (structure, fieldname);
if (field == NULL)
return FALSE;
if (!GST_VALUE_HOLDS_DATE_TIME (&field->value))
return FALSE;
/* FIXME: 0.11 g_value_dup_boxed() -> g_value_get_boxed() */
*value = g_value_dup_boxed (&field->value);
return TRUE;
}
/**
* gst_structure_get_clock_time:
* @structure: a #GstStructure
* @fieldname: the name of a field
* @value: (out): a pointer to a #GstClockTime to set
*
* Sets the clock time pointed to by @value corresponding to the clock time
* of the given field. Caller is responsible for making sure the field exists
* and has the correct type.
*
* Returns: TRUE if the value could be set correctly. If there was no field
* with @fieldname or the existing field did not contain a #GstClockTime, this
* function returns FALSE.
*/
gboolean
gst_structure_get_clock_time (const GstStructure * structure,
const gchar * fieldname, GstClockTime * value)
{
GstStructureField *field;
g_return_val_if_fail (structure != NULL, FALSE);
g_return_val_if_fail (fieldname != NULL, FALSE);
g_return_val_if_fail (value != NULL, FALSE);
field = gst_structure_get_field (structure, fieldname);
if (field == NULL)
return FALSE;
if (!G_VALUE_HOLDS_UINT64 (&field->value))
return FALSE;
*value = gst_g_value_get_uint64_unchecked (&field->value);
return TRUE;
}
/**
* gst_structure_get_double:
* @structure: a #GstStructure
* @fieldname: the name of a field
* @value: (out): a pointer to a gdouble to set
*
* Sets the double pointed to by @value corresponding to the value of the
* given field. Caller is responsible for making sure the field exists
* and has the correct type.
*
* Returns: TRUE if the value could be set correctly. If there was no field
* with @fieldname or the existing field did not contain a double, this
* function returns FALSE.
*/
gboolean
gst_structure_get_double (const GstStructure * structure,
const gchar * fieldname, gdouble * value)
{
GstStructureField *field;
g_return_val_if_fail (structure != NULL, FALSE);
g_return_val_if_fail (fieldname != NULL, FALSE);
g_return_val_if_fail (value != NULL, FALSE);
field = gst_structure_get_field (structure, fieldname);
if (field == NULL)
return FALSE;
if (!G_VALUE_HOLDS_DOUBLE (&field->value))
return FALSE;
*value = gst_g_value_get_double_unchecked (&field->value);
return TRUE;
}
/**
* gst_structure_get_string:
* @structure: a #GstStructure
* @fieldname: the name of a field
*
* Finds the field corresponding to @fieldname, and returns the string
* contained in the field's value. Caller is responsible for making
* sure the field exists and has the correct type.
*
* The string should not be modified, and remains valid until the next
* call to a gst_structure_*() function with the given structure.
*
* Returns: a pointer to the string or NULL when the field did not exist
* or did not contain a string.
*/
const gchar *
gst_structure_get_string (const GstStructure * structure,
const gchar * fieldname)
{
GstStructureField *field;
g_return_val_if_fail (structure != NULL, NULL);
g_return_val_if_fail (fieldname != NULL, NULL);
field = gst_structure_get_field (structure, fieldname);
if (field == NULL)
return NULL;
if (!G_VALUE_HOLDS_STRING (&field->value))
return NULL;
return gst_g_value_get_string_unchecked (&field->value);
}
/**
* gst_structure_get_enum:
* @structure: a #GstStructure
* @fieldname: the name of a field
* @enumtype: the enum type of a field
* @value: (out): a pointer to an int to set
*
* Sets the int pointed to by @value corresponding to the value of the
* given field. Caller is responsible for making sure the field exists,
* has the correct type and that the enumtype is correct.
*
* Returns: TRUE if the value could be set correctly. If there was no field
* with @fieldname or the existing field did not contain an enum of the given
* type, this function returns FALSE.
*/
gboolean
gst_structure_get_enum (const GstStructure * structure,
const gchar * fieldname, GType enumtype, gint * value)
{
GstStructureField *field;
g_return_val_if_fail (structure != NULL, FALSE);
g_return_val_if_fail (fieldname != NULL, FALSE);
g_return_val_if_fail (enumtype != G_TYPE_INVALID, FALSE);
g_return_val_if_fail (value != NULL, FALSE);
field = gst_structure_get_field (structure, fieldname);
if (field == NULL)
return FALSE;
if (!G_TYPE_CHECK_VALUE_TYPE (&field->value, enumtype))
return FALSE;
*value = g_value_get_enum (&field->value);
return TRUE;
}
/**
* gst_structure_get_fraction:
* @structure: a #GstStructure
* @fieldname: the name of a field
* @value_numerator: (out): a pointer to an int to set
* @value_denominator: (out): a pointer to an int to set
*
* Sets the integers pointed to by @value_numerator and @value_denominator
* corresponding to the value of the given field. Caller is responsible
* for making sure the field exists and has the correct type.
*
* Returns: TRUE if the values could be set correctly. If there was no field
* with @fieldname or the existing field did not contain a GstFraction, this
* function returns FALSE.
*/
gboolean
gst_structure_get_fraction (const GstStructure * structure,
const gchar * fieldname, gint * value_numerator, gint * value_denominator)
{
GstStructureField *field;
g_return_val_if_fail (structure != NULL, FALSE);
g_return_val_if_fail (fieldname != NULL, FALSE);
g_return_val_if_fail (value_numerator != NULL, FALSE);
g_return_val_if_fail (value_denominator != NULL, FALSE);
field = gst_structure_get_field (structure, fieldname);
if (field == NULL)
return FALSE;
if (!GST_VALUE_HOLDS_FRACTION (&field->value))
return FALSE;
*value_numerator = gst_value_get_fraction_numerator (&field->value);
*value_denominator = gst_value_get_fraction_denominator (&field->value);
return TRUE;
}
typedef struct _GstStructureAbbreviation
{
const gchar *type_name;
GType type;
}
GstStructureAbbreviation;
/* return a copy of an array of GstStructureAbbreviation containing all the
* known type_string, GType maps, including abbreviations for common types */
static GstStructureAbbreviation *
gst_structure_get_abbrs (gint * n_abbrs)
{
static GstStructureAbbreviation *abbrs = NULL;
static volatile gsize num = 0;
if (g_once_init_enter (&num)) {
/* dynamically generate the array */
gsize _num;
GstStructureAbbreviation dyn_abbrs[] = {
{"int", G_TYPE_INT}
,
{"i", G_TYPE_INT}
,
{"uint", G_TYPE_UINT}
,
{"u", G_TYPE_UINT}
,
{"float", G_TYPE_FLOAT}
,
{"f", G_TYPE_FLOAT}
,
{"double", G_TYPE_DOUBLE}
,
{"d", G_TYPE_DOUBLE}
,
{"buffer", GST_TYPE_BUFFER}
,
{"fraction", GST_TYPE_FRACTION}
,
{"boolean", G_TYPE_BOOLEAN}
,
{"bool", G_TYPE_BOOLEAN}
,
{"b", G_TYPE_BOOLEAN}
,
{"string", G_TYPE_STRING}
,
{"str", G_TYPE_STRING}
,
{"s", G_TYPE_STRING}
,
{"structure", GST_TYPE_STRUCTURE}
,
{"date", G_TYPE_DATE}
,
{"datetime", GST_TYPE_DATE_TIME}
,
{"bitmask", GST_TYPE_BITMASK}
,
{"sample", GST_TYPE_SAMPLE}
,
{"taglist", GST_TYPE_TAG_LIST}
};
_num = G_N_ELEMENTS (dyn_abbrs);
/* permanently allocate and copy the array now */
abbrs = g_new0 (GstStructureAbbreviation, _num);
memcpy (abbrs, dyn_abbrs, sizeof (GstStructureAbbreviation) * _num);
g_once_init_leave (&num, _num);
}
*n_abbrs = num;
return abbrs;
}
/* given a type_name that could be a type abbreviation or a registered GType,
* return a matching GType */
static GType
gst_structure_gtype_from_abbr (const char *type_name)
{
int i;
GstStructureAbbreviation *abbrs;
gint n_abbrs;
g_return_val_if_fail (type_name != NULL, G_TYPE_INVALID);
abbrs = gst_structure_get_abbrs (&n_abbrs);
for (i = 0; i < n_abbrs; i++) {
if (strcmp (type_name, abbrs[i].type_name) == 0) {
return abbrs[i].type;
}
}
/* this is the fallback */
return g_type_from_name (type_name);
}
static const char *
gst_structure_to_abbr (GType type)
{
int i;
GstStructureAbbreviation *abbrs;
gint n_abbrs;
g_return_val_if_fail (type != G_TYPE_INVALID, NULL);
abbrs = gst_structure_get_abbrs (&n_abbrs);
for (i = 0; i < n_abbrs; i++) {
if (type == abbrs[i].type) {
return abbrs[i].type_name;
}
}
return g_type_name (type);
}
static GType
gst_structure_value_get_generic_type (GValue * val)
{
if (G_VALUE_TYPE (val) == GST_TYPE_LIST
|| G_VALUE_TYPE (val) == GST_TYPE_ARRAY) {
GArray *array = g_value_peek_pointer (val);
if (array->len > 0) {
GValue *value = &g_array_index (array, GValue, 0);
return gst_structure_value_get_generic_type (value);
} else {
return G_TYPE_INT;
}
} else if (G_VALUE_TYPE (val) == GST_TYPE_INT_RANGE) {
return G_TYPE_INT;
} else if (G_VALUE_TYPE (val) == GST_TYPE_INT64_RANGE) {
return G_TYPE_INT64;
} else if (G_VALUE_TYPE (val) == GST_TYPE_DOUBLE_RANGE) {
return G_TYPE_DOUBLE;
} else if (G_VALUE_TYPE (val) == GST_TYPE_FRACTION_RANGE) {
return GST_TYPE_FRACTION;
}
return G_VALUE_TYPE (val);
}
gboolean
priv_gst_structure_append_to_gstring (const GstStructure * structure,
GString * s)
{
GstStructureField *field;
guint i, len;
g_return_val_if_fail (s != NULL, FALSE);
len = GST_STRUCTURE_FIELDS (structure)->len;
for (i = 0; i < len; i++) {
char *t;
GType type;
field = GST_STRUCTURE_FIELD (structure, i);
t = gst_value_serialize (&field->value);
type = gst_structure_value_get_generic_type (&field->value);
g_string_append_len (s, ", ", 2);
/* FIXME: do we need to escape fieldnames? */
g_string_append (s, g_quark_to_string (field->name));
g_string_append_len (s, "=(", 2);
g_string_append (s, gst_structure_to_abbr (type));
g_string_append_c (s, ')');
g_string_append (s, t == NULL ? "NULL" : t);
g_free (t);
}
g_string_append_c (s, ';');
return TRUE;
}
/**
* gst_structure_to_string:
* @structure: a #GstStructure
*
* Converts @structure to a human-readable string representation.
*
* For debugging purposes its easier to do something like this:
* |[
* GST_LOG ("structure is %" GST_PTR_FORMAT, structure);
* ]|
* This prints the structure in human readble form.
*
* Free-function: g_free
*
* Returns: (transfer full): a pointer to string allocated by g_malloc().
* g_free() after usage.
*/
gchar *
gst_structure_to_string (const GstStructure * structure)
{
GString *s;
/* NOTE: This function is potentially called by the debug system,
* so any calls to gst_log() (and GST_DEBUG(), GST_LOG(), etc.)
* should be careful to avoid recursion. This includes any functions
* called by gst_structure_to_string. In particular, calls should
* not use the GST_PTR_FORMAT extension. */
g_return_val_if_fail (structure != NULL, NULL);
/* we estimate a minimum size based on the number of fields in order to
* avoid unnecessary reallocs within GString */
s = g_string_sized_new (STRUCTURE_ESTIMATED_STRING_LEN (structure));
g_string_append (s, g_quark_to_string (structure->name));
priv_gst_structure_append_to_gstring (structure, s);
return g_string_free (s, FALSE);
}
/*
* r will still point to the string. if end == next, the string will not be
* null-terminated. In all other cases it will be.
* end = pointer to char behind end of string, next = pointer to start of
* unread data.
* THIS FUNCTION MODIFIES THE STRING AND DETECTS INSIDE A NONTERMINATED STRING
*/
static gboolean
gst_structure_parse_string (gchar * s, gchar ** end, gchar ** next,
gboolean unescape)
{
gchar *w;
if (*s == 0)
return FALSE;
if (*s != '"') {
int ret;
ret = gst_structure_parse_simple_string (s, end);
*next = *end;
return ret;
}
if (unescape) {
w = s;
s++;
while (*s != '"') {
if (G_UNLIKELY (*s == 0))
return FALSE;
if (G_UNLIKELY (*s == '\\'))
s++;
*w = *s;
w++;
s++;
}
s++;
} else {
/* Find the closing quotes */
s++;
while (*s != '"') {
if (G_UNLIKELY (*s == 0))
return FALSE;
if (G_UNLIKELY (*s == '\\'))
s++;
s++;
}
s++;
w = s;
}
*end = w;
*next = s;
return TRUE;
}
static gboolean
gst_structure_parse_range (gchar * s, gchar ** after, GValue * value,
GType type)
{
GValue value1 = { 0 };
GValue value2 = { 0 };
GValue value3 = { 0 };
GType range_type;
gboolean ret, have_step = FALSE;
if (*s != '[')
return FALSE;
s++;
ret = gst_structure_parse_value (s, &s, &value1, type);
if (ret == FALSE)
return FALSE;
while (g_ascii_isspace (*s))
s++;
if (*s != ',')
return FALSE;
s++;
while (g_ascii_isspace (*s))
s++;
ret = gst_structure_parse_value (s, &s, &value2, type);
if (ret == FALSE)
return FALSE;
while (g_ascii_isspace (*s))
s++;
/* optional step for int and int64 */
if (G_VALUE_TYPE (&value1) == G_TYPE_INT
|| G_VALUE_TYPE (&value1) == G_TYPE_INT64) {
if (*s == ',') {
s++;
while (g_ascii_isspace (*s))
s++;
ret = gst_structure_parse_value (s, &s, &value3, type);
if (ret == FALSE)
return FALSE;
while (g_ascii_isspace (*s))
s++;
have_step = TRUE;
}
}
if (*s != ']')
return FALSE;
s++;
if (G_VALUE_TYPE (&value1) != G_VALUE_TYPE (&value2))
return FALSE;
if (have_step && G_VALUE_TYPE (&value1) != G_VALUE_TYPE (&value3))
return FALSE;
if (G_VALUE_TYPE (&value1) == G_TYPE_DOUBLE) {
range_type = GST_TYPE_DOUBLE_RANGE;
g_value_init (value, range_type);
gst_value_set_double_range (value,
gst_g_value_get_double_unchecked (&value1),
gst_g_value_get_double_unchecked (&value2));
} else if (G_VALUE_TYPE (&value1) == G_TYPE_INT) {
range_type = GST_TYPE_INT_RANGE;
g_value_init (value, range_type);
if (have_step)
gst_value_set_int_range_step (value,
gst_g_value_get_int_unchecked (&value1),
gst_g_value_get_int_unchecked (&value2),
gst_g_value_get_int_unchecked (&value3));
else
gst_value_set_int_range (value, gst_g_value_get_int_unchecked (&value1),
gst_g_value_get_int_unchecked (&value2));
} else if (G_VALUE_TYPE (&value1) == G_TYPE_INT64) {
range_type = GST_TYPE_INT64_RANGE;
g_value_init (value, range_type);
if (have_step)
gst_value_set_int64_range_step (value,
gst_g_value_get_int64_unchecked (&value1),
gst_g_value_get_int64_unchecked (&value2),
gst_g_value_get_int64_unchecked (&value3));
else
gst_value_set_int64_range (value,
gst_g_value_get_int64_unchecked (&value1),
gst_g_value_get_int64_unchecked (&value2));
} else if (G_VALUE_TYPE (&value1) == GST_TYPE_FRACTION) {
range_type = GST_TYPE_FRACTION_RANGE;
g_value_init (value, range_type);
gst_value_set_fraction_range (value, &value1, &value2);
} else {
return FALSE;
}
*after = s;
return TRUE;
}
static gboolean
gst_structure_parse_any_list (gchar * s, gchar ** after, GValue * value,
GType type, GType list_type, char begin, char end)
{
GValue list_value = { 0 };
gboolean ret;
GArray *array;
g_value_init (value, list_type);
array = g_value_peek_pointer (value);
if (*s != begin)
return FALSE;
s++;
while (g_ascii_isspace (*s))
s++;
if (*s == end) {
s++;
*after = s;
return TRUE;
}
ret = gst_structure_parse_value (s, &s, &list_value, type);
if (ret == FALSE)
return FALSE;
g_array_append_val (array, list_value);
while (g_ascii_isspace (*s))
s++;
while (*s != end) {
if (*s != ',')
return FALSE;
s++;
while (g_ascii_isspace (*s))
s++;
memset (&list_value, 0, sizeof (list_value));
ret = gst_structure_parse_value (s, &s, &list_value, type);
if (ret == FALSE)
return FALSE;
g_array_append_val (array, list_value);
while (g_ascii_isspace (*s))
s++;
}
s++;
*after = s;
return TRUE;
}
static gboolean
gst_structure_parse_list (gchar * s, gchar ** after, GValue * value, GType type)
{
return gst_structure_parse_any_list (s, after, value, type, GST_TYPE_LIST,
'{', '}');
}
static gboolean
gst_structure_parse_array (gchar * s, gchar ** after, GValue * value,
GType type)
{
return gst_structure_parse_any_list (s, after, value, type,
GST_TYPE_ARRAY, '<', '>');
}
static gboolean
gst_structure_parse_simple_string (gchar * str, gchar ** end)
{
char *s = str;
while (G_LIKELY (GST_ASCII_IS_STRING (*s))) {
s++;
}
*end = s;
return (s != str);
}
static gboolean
gst_structure_parse_field (gchar * str,
gchar ** after, GstStructureField * field)
{
gchar *name;
gchar *name_end;
gchar *s;
gchar c;
s = str;
while (g_ascii_isspace (*s) || (s[0] == '\\' && g_ascii_isspace (s[1])))
s++;
name = s;
if (G_UNLIKELY (!gst_structure_parse_simple_string (s, &name_end))) {
GST_WARNING ("failed to parse simple string, str=%s", str);
return FALSE;
}
s = name_end;
while (g_ascii_isspace (*s) || (s[0] == '\\' && g_ascii_isspace (s[1])))
s++;
if (G_UNLIKELY (*s != '=')) {
GST_WARNING ("missing assignment operator in the field, str=%s", str);
return FALSE;
}
s++;
c = *name_end;
*name_end = '\0';
field->name = g_quark_from_string (name);
GST_DEBUG ("trying field name '%s'", name);
*name_end = c;
if (G_UNLIKELY (!gst_structure_parse_value (s, &s, &field->value,
G_TYPE_INVALID))) {
GST_WARNING ("failed to parse value %s", str);
return FALSE;
}
*after = s;
return TRUE;
}
static gboolean
gst_structure_parse_value (gchar * str,
gchar ** after, GValue * value, GType default_type)
{
gchar *type_name;
gchar *type_end;
gchar *value_s;
gchar *value_end;
gchar *s;
gchar c;
int ret = 0;
GType type = default_type;
s = str;
while (g_ascii_isspace (*s))
s++;
/* check if there's a (type_name) 'cast' */
type_name = NULL;
if (*s == '(') {
s++;
while (g_ascii_isspace (*s))
s++;
type_name = s;
if (G_UNLIKELY (!gst_structure_parse_simple_string (s, &type_end)))
return FALSE;
s = type_end;
while (g_ascii_isspace (*s))
s++;
if (G_UNLIKELY (*s != ')'))
return FALSE;
s++;
while (g_ascii_isspace (*s))
s++;
c = *type_end;
*type_end = 0;
type = gst_structure_gtype_from_abbr (type_name);
GST_DEBUG ("trying type name '%s'", type_name);
*type_end = c;
if (G_UNLIKELY (type == G_TYPE_INVALID)) {
GST_WARNING ("invalid type");
return FALSE;
}
}
while (g_ascii_isspace (*s))
s++;
if (*s == '[') {
ret = gst_structure_parse_range (s, &s, value, type);
} else if (*s == '{') {
ret = gst_structure_parse_list (s, &s, value, type);
} else if (*s == '<') {
ret = gst_structure_parse_array (s, &s, value, type);
} else {
value_s = s;
if (G_UNLIKELY (type == G_TYPE_INVALID)) {
GType try_types[] =
{ G_TYPE_INT, G_TYPE_DOUBLE, GST_TYPE_FRACTION, G_TYPE_BOOLEAN,
G_TYPE_STRING
};
int i;
if (G_UNLIKELY (!gst_structure_parse_string (s, &value_end, &s, TRUE)))
return FALSE;
/* Set NULL terminator for deserialization */
c = *value_end;
*value_end = '\0';
for (i = 0; i < G_N_ELEMENTS (try_types); i++) {
g_value_init (value, try_types[i]);
ret = gst_value_deserialize (value, value_s);
if (ret)
break;
g_value_unset (value);
}
} else {
g_value_init (value, type);
if (G_UNLIKELY (!gst_structure_parse_string (s, &value_end, &s,
(type != G_TYPE_STRING))))
return FALSE;
/* Set NULL terminator for deserialization */
c = *value_end;
*value_end = '\0';
ret = gst_value_deserialize (value, value_s);
if (G_UNLIKELY (!ret))
g_value_unset (value);
}
*value_end = c;
}
*after = s;
return ret;
}
gboolean
priv_gst_structure_parse_name (gchar * str, gchar ** start, gchar ** end,
gchar ** next)
{
char *w;
char *r;
r = str;
/* skip spaces (FIXME: _isspace treats tabs and newlines as space!) */
while (*r && (g_ascii_isspace (*r) || (r[0] == '\\'
&& g_ascii_isspace (r[1]))))
r++;
*start = r;
if (G_UNLIKELY (!gst_structure_parse_string (r, &w, &r, TRUE))) {
GST_WARNING ("Failed to parse structure string '%s'", str);
return FALSE;
}
*end = w;
*next = r;
return TRUE;
}
gboolean
priv_gst_structure_parse_fields (gchar * str, gchar ** end,
GstStructure * structure)
{
gchar *r;
GstStructureField field;
r = str;
do {
while (*r && (g_ascii_isspace (*r) || (r[0] == '\\'
&& g_ascii_isspace (r[1]))))
r++;
if (*r == ';') {
/* end of structure, get the next char and finish */
r++;
break;
}
if (*r == '\0') {
/* accept \0 as end delimiter */
break;
}
if (G_UNLIKELY (*r != ',')) {
GST_WARNING ("Failed to find delimiter, r=%s", r);
return FALSE;
}
r++;
while (*r && (g_ascii_isspace (*r) || (r[0] == '\\'
&& g_ascii_isspace (r[1]))))
r++;
memset (&field, 0, sizeof (field));
if (G_UNLIKELY (!gst_structure_parse_field (r, &r, &field))) {
GST_WARNING ("Failed to parse field, r=%s", r);
return FALSE;
}
gst_structure_set_field (structure, &field);
} while (TRUE);
*end = r;
return TRUE;
}
/**
* gst_structure_from_string:
* @string: a string representation of a #GstStructure.
* @end: (out) (allow-none) (transfer none): pointer to store the end of the string in.
*
* Creates a #GstStructure from a string representation.
* If end is not NULL, a pointer to the place inside the given string
* where parsing ended will be returned.
*
* Free-function: gst_structure_free
*
* Returns: (transfer full): a new #GstStructure or NULL when the string could
* not be parsed. Free with gst_structure_free() after use.
*/
GstStructure *
gst_structure_from_string (const gchar * string, gchar ** end)
{
char *name;
char *copy;
char *w;
char *r;
char save;
GstStructure *structure = NULL;
g_return_val_if_fail (string != NULL, NULL);
copy = g_strdup (string);
r = copy;
if (!priv_gst_structure_parse_name (r, &name, &w, &r))
goto error;
save = *w;
*w = '\0';
structure = gst_structure_new_empty (name);
*w = save;
if (G_UNLIKELY (structure == NULL))
goto error;
if (!priv_gst_structure_parse_fields (r, &r, structure))
goto error;
if (end)
*end = (char *) string + (r - copy);
else if (*r)
g_warning ("gst_structure_from_string did not consume whole string,"
" but caller did not provide end pointer (\"%s\")", string);
g_free (copy);
return structure;
error:
if (structure)
gst_structure_free (structure);
g_free (copy);
return NULL;
}
static void
gst_structure_transform_to_string (const GValue * src_value,
GValue * dest_value)
{
g_return_if_fail (src_value != NULL);
g_return_if_fail (dest_value != NULL);
dest_value->data[0].v_pointer =
gst_structure_to_string (src_value->data[0].v_pointer);
}
static GstStructure *
gst_structure_copy_conditional (const GstStructure * structure)
{
if (structure)
return gst_structure_copy (structure);
return NULL;
}
/* fixate utility functions */
/**
* gst_structure_fixate_field_nearest_int:
* @structure: a #GstStructure
* @field_name: a field in @structure
* @target: the target value of the fixation
*
* Fixates a #GstStructure by changing the given field to the nearest
* integer to @target that is a subset of the existing field.
*
* Returns: TRUE if the structure could be fixated
*/
gboolean
gst_structure_fixate_field_nearest_int (GstStructure * structure,
const char *field_name, int target)
{
const GValue *value;
g_return_val_if_fail (gst_structure_has_field (structure, field_name), FALSE);
g_return_val_if_fail (IS_MUTABLE (structure), FALSE);
value = gst_structure_get_value (structure, field_name);
if (G_VALUE_TYPE (value) == G_TYPE_INT) {
/* already fixed */
return FALSE;
} else if (G_VALUE_TYPE (value) == GST_TYPE_INT_RANGE) {
int x;
x = gst_value_get_int_range_min (value);
if (target < x)
target = x;
x = gst_value_get_int_range_max (value);
if (target > x)
target = x;
gst_structure_set (structure, field_name, G_TYPE_INT, target, NULL);
return TRUE;
} else if (G_VALUE_TYPE (value) == GST_TYPE_LIST) {
const GValue *list_value;
int i, n;
int best = 0;
int best_index = -1;
n = gst_value_list_get_size (value);
for (i = 0; i < n; i++) {
list_value = gst_value_list_get_value (value, i);
if (G_VALUE_TYPE (list_value) == G_TYPE_INT) {
int x = gst_g_value_get_int_unchecked (list_value);
if (best_index == -1 || (ABS (target - x) < ABS (target - best))) {
best_index = i;
best = x;
}
}
}
if (best_index != -1) {
gst_structure_set (structure, field_name, G_TYPE_INT, best, NULL);
return TRUE;
}
return FALSE;
}
return FALSE;
}
/**
* gst_structure_fixate_field_nearest_double:
* @structure: a #GstStructure
* @field_name: a field in @structure
* @target: the target value of the fixation
*
* Fixates a #GstStructure by changing the given field to the nearest
* double to @target that is a subset of the existing field.
*
* Returns: TRUE if the structure could be fixated
*/
gboolean
gst_structure_fixate_field_nearest_double (GstStructure * structure,
const char *field_name, double target)
{
const GValue *value;
g_return_val_if_fail (gst_structure_has_field (structure, field_name), FALSE);
g_return_val_if_fail (IS_MUTABLE (structure), FALSE);
value = gst_structure_get_value (structure, field_name);
if (G_VALUE_TYPE (value) == G_TYPE_DOUBLE) {
/* already fixed */
return FALSE;
} else if (G_VALUE_TYPE (value) == GST_TYPE_DOUBLE_RANGE) {
double x;
x = gst_value_get_double_range_min (value);
if (target < x)
target = x;
x = gst_value_get_double_range_max (value);
if (target > x)
target = x;
gst_structure_set (structure, field_name, G_TYPE_DOUBLE, target, NULL);
return TRUE;
} else if (G_VALUE_TYPE (value) == GST_TYPE_LIST) {
const GValue *list_value;
int i, n;
double best = 0;
int best_index = -1;
n = gst_value_list_get_size (value);
for (i = 0; i < n; i++) {
list_value = gst_value_list_get_value (value, i);
if (G_VALUE_TYPE (list_value) == G_TYPE_DOUBLE) {
double x = gst_g_value_get_double_unchecked (list_value);
if (best_index == -1 || (ABS (target - x) < ABS (target - best))) {
best_index = i;
best = x;
}
}
}
if (best_index != -1) {
gst_structure_set (structure, field_name, G_TYPE_DOUBLE, best, NULL);
return TRUE;
}
return FALSE;
}
return FALSE;
}
/**
* gst_structure_fixate_field_boolean:
* @structure: a #GstStructure
* @field_name: a field in @structure
* @target: the target value of the fixation
*
* Fixates a #GstStructure by changing the given @field_name field to the given
* @target boolean if that field is not fixed yet.
*
* Returns: TRUE if the structure could be fixated
*/
gboolean
gst_structure_fixate_field_boolean (GstStructure * structure,
const char *field_name, gboolean target)
{
const GValue *value;
g_return_val_if_fail (gst_structure_has_field (structure, field_name), FALSE);
g_return_val_if_fail (IS_MUTABLE (structure), FALSE);
value = gst_structure_get_value (structure, field_name);
if (G_VALUE_TYPE (value) == G_TYPE_BOOLEAN) {
/* already fixed */
return FALSE;
} else if (G_VALUE_TYPE (value) == GST_TYPE_LIST) {
const GValue *list_value;
int i, n;
int best = 0;
int best_index = -1;
n = gst_value_list_get_size (value);
for (i = 0; i < n; i++) {
list_value = gst_value_list_get_value (value, i);
if (G_VALUE_TYPE (list_value) == G_TYPE_BOOLEAN) {
gboolean x = gst_g_value_get_boolean_unchecked (list_value);
if (best_index == -1 || x == target) {
best_index = i;
best = x;
}
}
}
if (best_index != -1) {
gst_structure_set (structure, field_name, G_TYPE_BOOLEAN, best, NULL);
return TRUE;
}
return FALSE;
}
return FALSE;
}
/**
* gst_structure_fixate_field_string:
* @structure: a #GstStructure
* @field_name: a field in @structure
* @target: the target value of the fixation
*
* Fixates a #GstStructure by changing the given @field_name field to the given
* @target string if that field is not fixed yet.
*
* Returns: TRUE if the structure could be fixated
*/
gboolean
gst_structure_fixate_field_string (GstStructure * structure,
const gchar * field_name, const gchar * target)
{
const GValue *value;
g_return_val_if_fail (gst_structure_has_field (structure, field_name), FALSE);
g_return_val_if_fail (IS_MUTABLE (structure), FALSE);
value = gst_structure_get_value (structure, field_name);
if (G_VALUE_TYPE (value) == G_TYPE_STRING) {
/* already fixed */
return FALSE;
} else if (G_VALUE_TYPE (value) == GST_TYPE_LIST) {
const GValue *list_value;
int i, n;
const gchar *best = NULL;
int best_index = -1;
n = gst_value_list_get_size (value);
for (i = 0; i < n; i++) {
list_value = gst_value_list_get_value (value, i);
if (G_VALUE_TYPE (list_value) == G_TYPE_STRING) {
const gchar *x = g_value_get_string (list_value);
if (best_index == -1 || g_str_equal (x, target)) {
best_index = i;
best = x;
}
}
}
if (best_index != -1) {
gst_structure_set (structure, field_name, G_TYPE_STRING, best, NULL);
return TRUE;
}
return FALSE;
}
return FALSE;
}
/**
* gst_structure_fixate_field_nearest_fraction:
* @structure: a #GstStructure
* @field_name: a field in @structure
* @target_numerator: The numerator of the target value of the fixation
* @target_denominator: The denominator of the target value of the fixation
*
* Fixates a #GstStructure by changing the given field to the nearest
* fraction to @target_numerator/@target_denominator that is a subset
* of the existing field.
*
* Returns: TRUE if the structure could be fixated
*/
gboolean
gst_structure_fixate_field_nearest_fraction (GstStructure * structure,
const char *field_name, const gint target_numerator,
const gint target_denominator)
{
const GValue *value;
g_return_val_if_fail (gst_structure_has_field (structure, field_name), FALSE);
g_return_val_if_fail (IS_MUTABLE (structure), FALSE);
value = gst_structure_get_value (structure, field_name);
if (G_VALUE_TYPE (value) == GST_TYPE_FRACTION) {
/* already fixed */
return FALSE;
} else if (G_VALUE_TYPE (value) == GST_TYPE_FRACTION_RANGE) {
const GValue *x, *new_value;
GValue target = { 0 };
g_value_init (&target, GST_TYPE_FRACTION);
gst_value_set_fraction (&target, target_numerator, target_denominator);
new_value = &target;
x = gst_value_get_fraction_range_min (value);
if (gst_value_compare (&target, x) == GST_VALUE_LESS_THAN)
new_value = x;
x = gst_value_get_fraction_range_max (value);
if (gst_value_compare (&target, x) == GST_VALUE_GREATER_THAN)
new_value = x;
gst_structure_set_value (structure, field_name, new_value);
g_value_unset (&target);
return TRUE;
} else if (G_VALUE_TYPE (value) == GST_TYPE_LIST) {
const GValue *list_value;
int i, n;
const GValue *best = NULL;
gdouble target;
gdouble cur_diff;
gdouble best_diff = G_MAXDOUBLE;
target = (gdouble) target_numerator / (gdouble) target_denominator;
GST_DEBUG ("target %g, best %g", target, best_diff);
best = NULL;
n = gst_value_list_get_size (value);
for (i = 0; i < n; i++) {
list_value = gst_value_list_get_value (value, i);
if (G_VALUE_TYPE (list_value) == GST_TYPE_FRACTION) {
gint num, denom;
gdouble list_double;
num = gst_value_get_fraction_numerator (list_value);
denom = gst_value_get_fraction_denominator (list_value);
list_double = ((gdouble) num / (gdouble) denom);
cur_diff = target - list_double;
GST_DEBUG ("curr diff %g, list %g", cur_diff, list_double);
if (cur_diff < 0)
cur_diff = -cur_diff;
if (!best || cur_diff < best_diff) {
GST_DEBUG ("new best %g", list_double);
best = list_value;
best_diff = cur_diff;
}
}
}
if (best != NULL) {
gst_structure_set_value (structure, field_name, best);
return TRUE;
}
}
return FALSE;
}
static gboolean
default_fixate (GQuark field_id, const GValue * value, gpointer data)
{
GstStructure *s = data;
GValue v = { 0 };
if (gst_value_fixate (&v, value)) {
gst_structure_id_take_value (s, field_id, &v);
}
return TRUE;
}
/**
* gst_structure_fixate_field:
* @structure: a #GstStructure
* @field_name: a field in @structure
*
* Fixates a #GstStructure by changing the given field with its fixated value.
*
* Returns: TRUE if the structure field could be fixated
*/
gboolean
gst_structure_fixate_field (GstStructure * structure, const char *field_name)
{
GstStructureField *field;
g_return_val_if_fail (structure != NULL, FALSE);
g_return_val_if_fail (IS_MUTABLE (structure), FALSE);
if (!(field = gst_structure_get_field (structure, field_name)))
return FALSE;
return default_fixate (field->name, &field->value, structure);
}
/* our very own version of G_VALUE_LCOPY that allows NULL return locations
* (useful for message parsing functions where the return location is user
* supplied and the user may pass NULL if the value isn't of interest) */
#define GST_VALUE_LCOPY(value, var_args, flags, __error, fieldname) \
G_STMT_START { \
const GValue *_value = (value); \
guint _flags = (flags); \
GType _value_type = G_VALUE_TYPE (_value); \
GTypeValueTable *_vtable = g_type_value_table_peek (_value_type); \
const gchar *_lcopy_format = _vtable->lcopy_format; \
GTypeCValue _cvalues[G_VALUE_COLLECT_FORMAT_MAX_LENGTH] = { { 0, }, }; \
guint _n_values = 0; \
\
while (*_lcopy_format != '\0') { \
g_assert (*_lcopy_format == G_VALUE_COLLECT_POINTER); \
_cvalues[_n_values++].v_pointer = va_arg ((var_args), gpointer); \
_lcopy_format++; \
} \
if (_n_values == 2 && !!_cvalues[0].v_pointer != !!_cvalues[1].v_pointer) { \
*(__error) = g_strdup_printf ("either all or none of the return " \
"locations for field '%s' need to be NULL", fieldname); \
} else if (_cvalues[0].v_pointer != NULL) { \
*(__error) = _vtable->lcopy_value (_value, _n_values, _cvalues, _flags); \
} \
} G_STMT_END
/**
* gst_structure_get_valist:
* @structure: a #GstStructure
* @first_fieldname: the name of the first field to read
* @args: variable arguments
*
* Parses the variable arguments and reads fields from @structure accordingly.
* valist-variant of gst_structure_get(). Look at the documentation of
* gst_structure_get() for more details.
*
* Returns: TRUE, or FALSE if there was a problem reading any of the fields
*/
gboolean
gst_structure_get_valist (const GstStructure * structure,
const char *first_fieldname, va_list args)
{
const char *field_name;
GType expected_type = G_TYPE_INVALID;
g_return_val_if_fail (GST_IS_STRUCTURE (structure), FALSE);
g_return_val_if_fail (first_fieldname != NULL, FALSE);
field_name = first_fieldname;
while (field_name) {
const GValue *val = NULL;
gchar *err = NULL;
expected_type = va_arg (args, GType);
val = gst_structure_get_value (structure, field_name);
if (val == NULL)
goto no_such_field;
if (G_VALUE_TYPE (val) != expected_type)
goto wrong_type;
GST_VALUE_LCOPY (val, args, 0, &err, field_name);
if (err) {
g_warning ("%s: %s", G_STRFUNC, err);
g_free (err);
return FALSE;
}
field_name = va_arg (args, const gchar *);
}
return TRUE;
/* ERRORS */
no_such_field:
{
GST_INFO ("Expected field '%s' in structure: %" GST_PTR_FORMAT,
field_name, structure);
return FALSE;
}
wrong_type:
{
GST_INFO ("Expected field '%s' in structure to be of type '%s', but "
"field was of type '%s': %" GST_PTR_FORMAT, field_name,
GST_STR_NULL (g_type_name (expected_type)),
G_VALUE_TYPE_NAME (gst_structure_get_value (structure, field_name)),
structure);
return FALSE;
}
}
/**
* gst_structure_id_get_valist:
* @structure: a #GstStructure
* @first_field_id: the quark of the first field to read
* @args: variable arguments
*
* Parses the variable arguments and reads fields from @structure accordingly.
* valist-variant of gst_structure_id_get(). Look at the documentation of
* gst_structure_id_get() for more details.
*
* Returns: TRUE, or FALSE if there was a problem reading any of the fields
*/
gboolean
gst_structure_id_get_valist (const GstStructure * structure,
GQuark first_field_id, va_list args)
{
GQuark field_id;
GType expected_type = G_TYPE_INVALID;
g_return_val_if_fail (GST_IS_STRUCTURE (structure), FALSE);
g_return_val_if_fail (first_field_id != 0, FALSE);
field_id = first_field_id;
while (field_id) {
const GValue *val = NULL;
gchar *err = NULL;
expected_type = va_arg (args, GType);
val = gst_structure_id_get_value (structure, field_id);
if (val == NULL)
goto no_such_field;
if (G_VALUE_TYPE (val) != expected_type)
goto wrong_type;
GST_VALUE_LCOPY (val, args, 0, &err, g_quark_to_string (field_id));
if (err) {
g_warning ("%s: %s", G_STRFUNC, err);
g_free (err);
return FALSE;
}
field_id = va_arg (args, GQuark);
}
return TRUE;
/* ERRORS */
no_such_field:
{
GST_DEBUG ("Expected field '%s' in structure: %" GST_PTR_FORMAT,
GST_STR_NULL (g_quark_to_string (field_id)), structure);
return FALSE;
}
wrong_type:
{
GST_DEBUG ("Expected field '%s' in structure to be of type '%s', but "
"field was of type '%s': %" GST_PTR_FORMAT,
g_quark_to_string (field_id),
GST_STR_NULL (g_type_name (expected_type)),
G_VALUE_TYPE_NAME (gst_structure_id_get_value (structure, field_id)),
structure);
return FALSE;
}
}
/**
* gst_structure_get:
* @structure: a #GstStructure
* @first_fieldname: the name of the first field to read
* @...: variable arguments
*
* Parses the variable arguments and reads fields from @structure accordingly.
* Variable arguments should be in the form field name, field type
* (as a GType), pointer(s) to a variable(s) to hold the return value(s).
* The last variable argument should be NULL.
*
* For refcounted (mini)objects you will receive a new reference which
* you must release with a suitable _unref() when no longer needed. For
* strings and boxed types you will receive a copy which you will need to
* release with either g_free() or the suitable function for the boxed type.
*
* Returns: FALSE if there was a problem reading any of the fields (e.g.
* because the field requested did not exist, or was of a type other
* than the type specified), otherwise TRUE.
*/
gboolean
gst_structure_get (const GstStructure * structure, const char *first_fieldname,
...)
{
gboolean ret;
va_list args;
g_return_val_if_fail (GST_IS_STRUCTURE (structure), FALSE);
g_return_val_if_fail (first_fieldname != NULL, FALSE);
va_start (args, first_fieldname);
ret = gst_structure_get_valist (structure, first_fieldname, args);
va_end (args);
return ret;
}
/**
* gst_structure_id_get:
* @structure: a #GstStructure
* @first_field_id: the quark of the first field to read
* @...: variable arguments
*
* Parses the variable arguments and reads fields from @structure accordingly.
* Variable arguments should be in the form field id quark, field type
* (as a GType), pointer(s) to a variable(s) to hold the return value(s).
* The last variable argument should be NULL (technically it should be a
* 0 quark, but we require NULL so compilers that support it can check for
* the NULL terminator and warn if it's not there).
*
* This function is just like gst_structure_get() only that it is slightly
* more efficient since it saves the string-to-quark lookup in the global
* quark hashtable.
*
* For refcounted (mini)objects you will receive a new reference which
* you must release with a suitable _unref() when no longer needed. For
* strings and boxed types you will receive a copy which you will need to
* release with either g_free() or the suitable function for the boxed type.
*
* Returns: FALSE if there was a problem reading any of the fields (e.g.
* because the field requested did not exist, or was of a type other
* than the type specified), otherwise TRUE.
*/
gboolean
gst_structure_id_get (const GstStructure * structure, GQuark first_field_id,
...)
{
gboolean ret;
va_list args;
g_return_val_if_fail (GST_IS_STRUCTURE (structure), FALSE);
g_return_val_if_fail (first_field_id != 0, FALSE);
va_start (args, first_field_id);
ret = gst_structure_id_get_valist (structure, first_field_id, args);
va_end (args);
return ret;
}
static gboolean
gst_structure_is_equal_foreach (GQuark field_id, const GValue * val2,
gpointer data)
{
const GstStructure *struct1 = (const GstStructure *) data;
const GValue *val1 = gst_structure_id_get_value (struct1, field_id);
if (G_UNLIKELY (val1 == NULL))
return FALSE;
if (gst_value_compare (val1, val2) == GST_VALUE_EQUAL) {
return TRUE;
}
return FALSE;
}
/**
* gst_structure_is_equal:
* @structure1: a #GstStructure.
* @structure2: a #GstStructure.
*
* Tests if the two #GstStructure are equal.
*
* Returns: TRUE if the two structures have the same name and field.
**/
gboolean
gst_structure_is_equal (const GstStructure * structure1,
const GstStructure * structure2)
{
g_return_val_if_fail (GST_IS_STRUCTURE (structure1), FALSE);
g_return_val_if_fail (GST_IS_STRUCTURE (structure2), FALSE);
if (G_UNLIKELY (structure1 == structure2))
return TRUE;
if (structure1->name != structure2->name) {
return FALSE;
}
if (GST_STRUCTURE_FIELDS (structure1)->len !=
GST_STRUCTURE_FIELDS (structure2)->len) {
return FALSE;
}
return gst_structure_foreach (structure1, gst_structure_is_equal_foreach,
(gpointer) structure2);
}
typedef struct
{
GstStructure *dest;
const GstStructure *intersect;
}
IntersectData;
static gboolean
gst_structure_intersect_field1 (GQuark id, const GValue * val1, gpointer data)
{
IntersectData *idata = (IntersectData *) data;
const GValue *val2 = gst_structure_id_get_value (idata->intersect, id);
if (G_UNLIKELY (val2 == NULL)) {
gst_structure_id_set_value (idata->dest, id, val1);
} else {
GValue dest_value = { 0 };
if (gst_value_intersect (&dest_value, val1, val2)) {
gst_structure_id_take_value (idata->dest, id, &dest_value);
} else {
return FALSE;
}
}
return TRUE;
}
static gboolean
gst_structure_intersect_field2 (GQuark id, const GValue * val1, gpointer data)
{
IntersectData *idata = (IntersectData *) data;
const GValue *val2 = gst_structure_id_get_value (idata->intersect, id);
if (G_UNLIKELY (val2 == NULL)) {
gst_structure_id_set_value (idata->dest, id, val1);
}
return TRUE;
}
/**
* gst_structure_intersect:
* @struct1: a #GstStructure
* @struct2: a #GstStructure
*
* Interesects @struct1 and @struct2 and returns the intersection.
*
* Returns: Intersection of @struct1 and @struct2
*/
GstStructure *
gst_structure_intersect (const GstStructure * struct1,
const GstStructure * struct2)
{
IntersectData data;
g_assert (struct1 != NULL);
g_assert (struct2 != NULL);
if (G_UNLIKELY (struct1->name != struct2->name))
return NULL;
/* copy fields from struct1 which we have not in struct2 to target
* intersect if we have the field in both */
data.dest = gst_structure_new_id_empty (struct1->name);
data.intersect = struct2;
if (G_UNLIKELY (!gst_structure_foreach ((GstStructure *) struct1,
gst_structure_intersect_field1, &data)))
goto error;
/* copy fields from struct2 which we have not in struct1 to target */
data.intersect = struct1;
if (G_UNLIKELY (!gst_structure_foreach ((GstStructure *) struct2,
gst_structure_intersect_field2, &data)))
goto error;
return data.dest;
error:
gst_structure_free (data.dest);
return NULL;
}
static gboolean
gst_caps_structure_can_intersect_field (GQuark id, const GValue * val1,
gpointer data)
{
GstStructure *other = (GstStructure *) data;
const GValue *val2 = gst_structure_id_get_value (other, id);
if (G_LIKELY (val2)) {
if (!gst_value_can_intersect (val1, val2)) {
return FALSE;
} else {
gint eq = gst_value_compare (val1, val2);
if (eq == GST_VALUE_UNORDERED) {
/* we need to try interseting */
if (!gst_value_intersect (NULL, val1, val2)) {
return FALSE;
}
} else if (eq != GST_VALUE_EQUAL) {
return FALSE;
}
}
}
return TRUE;
}
/**
* gst_structure_can_intersect:
* @struct1: a #GstStructure
* @struct2: a #GstStructure
*
* Tries intersecting @struct1 and @struct2 and reports whether the result
* would not be empty.
*
* Returns: %TRUE if intersection would not be empty
*/
gboolean
gst_structure_can_intersect (const GstStructure * struct1,
const GstStructure * struct2)
{
g_return_val_if_fail (GST_IS_STRUCTURE (struct1), FALSE);
g_return_val_if_fail (GST_IS_STRUCTURE (struct2), FALSE);
if (G_UNLIKELY (struct1->name != struct2->name))
return FALSE;
/* tries to intersect if we have the field in both */
return gst_structure_foreach ((GstStructure *) struct1,
gst_caps_structure_can_intersect_field, (gpointer) struct2);
}
static gboolean
gst_caps_structure_is_superset_field (GQuark field_id, const GValue * value,
gpointer user_data)
{
GstStructure *subset = user_data;
const GValue *other;
int comparison;
if (!(other = gst_structure_id_get_value (subset, field_id)))
/* field is missing in the subset => no subset */
return FALSE;
comparison = gst_value_compare (value, other);
/* equal values are subset */
if (comparison == GST_VALUE_EQUAL)
return TRUE;
/* ordered, but unequal, values are not */
if (comparison != GST_VALUE_UNORDERED)
return FALSE;
return gst_value_is_subset (other, value);
}
/**
* gst_structure_is_subset:
* @subset: a #GstStructure
* @superset: a potentially greater #GstStructure
*
* Checks if @subset is a subset of @superset, i.e. has the same
* structure name and for all fields that are existing in @superset,
* @subset has a value that is a subset of the value in @superset.
*
* Returns: %TRUE if @subset is a subset of @superset
*/
gboolean
gst_structure_is_subset (const GstStructure * subset,
const GstStructure * superset)
{
if ((superset->name != subset->name) ||
(gst_structure_n_fields (superset) > gst_structure_n_fields (subset)))
return FALSE;
return gst_structure_foreach ((GstStructure *) superset,
gst_caps_structure_is_superset_field, (gpointer) subset);
}
/**
* gst_structure_fixate:
* @structure: a #GstStructure
*
* Fixate all values in @structure using gst_value_fixate().
* @structure will be modified in-place and should be writable.
*/
void
gst_structure_fixate (GstStructure * structure)
{
g_return_if_fail (GST_IS_STRUCTURE (structure));
gst_structure_foreach (structure, default_fixate, structure);
}
Reference in a new issue View git blame Copy permalink