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gstreamer/gst/gststructure.c
Jan Alexander Steffens (heftig) a20ff6aaf4 gststructure: Fix gst_structure_take ownership handling 
The old code would leave a dangling pointer in oldstr_ptr if two threads
attempted to take the same structure into the same location at the same
time:

1. First "oldstr == newstr" check (before the loop) fails.
2. Compare-and-exchange fails, due to a second thread completing the
   same gst_structure_take.
3. Second "oldstr == newstr" check (in the loop) succeeds, loop breaks.
4. "oldstr" check succeeds, old structure gets freed.
5. oldstr_ptr now contains a dangling pointer.

This shouldn't happen in code that handles ownership sanely, so check
that we don't try to do this and complain loudly.

Also simplify the function by using a do-while loop, like
gst_mini_object_take.

https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/413
2020-03-23 16:48:47 +00:00

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/* 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
* @title: 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 may be %NULL however.
*
* Be aware that the current #GstCaps / #GstStructure serialization into string
* has limited support for nested #GstCaps / #GstStructure fields. It can only
* support one level of nesting. Using more levels will lead to unexpected
* behavior when using serialization features, such as gst_caps_to_string() or
* gst_value_serialize() and their counterparts.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
/* FIXME 2.0: suppress warnings for deprecated API such as GValueArray
* with newer GLib versions (>= 2.31.0) */
#define GLIB_DISABLE_DEPRECATION_WARNINGS
#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;
guint fields_len; /* Number of valid items in fields */
guint fields_alloc; /* Allocated items in fields */
/* Fields are allocated if GST_STRUCTURE_IS_USING_DYNAMIC_ARRAY(),
* else it's a pointer to the arr field. */
GstStructureField *fields;
GstStructureField arr[1];
} GstStructureImpl;
#define GST_STRUCTURE_REFCOUNT(s) (((GstStructureImpl*)(s))->parent_refcount)
#define GST_STRUCTURE_LEN(s) (((GstStructureImpl*)(s))->fields_len)
#define GST_STRUCTURE_IS_USING_DYNAMIC_ARRAY(s) \
(((GstStructureImpl*)(s))->fields != &((GstStructureImpl*)(s))->arr[0])
#define GST_STRUCTURE_FIELD(structure, index) \
(&((GstStructureImpl*)(structure))->fields[(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))
/* Replacement for g_array_append_val */
static void
_structure_append_val (GstStructure * s, GstStructureField * val)
{
GstStructureImpl *impl = (GstStructureImpl *) s;
/* resize if needed */
if (G_UNLIKELY (impl->fields_len == impl->fields_alloc)) {
guint want_alloc;
if (G_UNLIKELY (impl->fields_alloc > (G_MAXUINT / 2)))
g_error ("Growing structure would result in overflow");
want_alloc =
MAX (GST_ROUND_UP_8 (impl->fields_len + 1), impl->fields_alloc * 2);
if (GST_STRUCTURE_IS_USING_DYNAMIC_ARRAY (s)) {
impl->fields = g_renew (GstStructureField, impl->fields, want_alloc);
} else {
impl->fields = g_new0 (GstStructureField, want_alloc);
memcpy (impl->fields, &impl->arr[0],
impl->fields_len * sizeof (GstStructureField));
GST_CAT_LOG (GST_CAT_PERFORMANCE, "Exceeding pre-allocated array");
}
impl->fields_alloc = want_alloc;
}
/* Finally set value */
impl->fields[impl->fields_len++] = *val;
}
/* Replacement for g_array_remove_index */
static inline void
_structure_remove_index (GstStructure * s, guint idx)
{
GstStructureImpl *impl = (GstStructureImpl *) s;
/* We never "reduce" the memory footprint. */
if (idx >= impl->fields_len)
return;
/* Shift everything if it's not the last item */
if (idx != impl->fields_len)
memmove (&impl->fields[idx],
&impl->fields[idx + 1],
(impl->fields_len - idx - 1) * sizeof (GstStructureField));
impl->fields_len--;
}
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);
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)
{
guint n_alloc;
GstStructureImpl *structure;
if (prealloc == 0)
prealloc = 1;
n_alloc = GST_ROUND_UP_8 (prealloc);
structure =
g_malloc0 (sizeof (GstStructureImpl) + (n_alloc -
1) * sizeof (GstStructureField));
((GstStructure *) structure)->type = _gst_structure_type;
((GstStructure *) structure)->name = quark;
GST_STRUCTURE_REFCOUNT (structure) = NULL;
structure->fields_len = 0;
structure->fields_alloc = n_alloc;
structure->fields = &structure->arr[0];
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;
va_list copy;
guint len = 0;
const gchar *field_copy = firstfield;
GType type_copy;
g_return_val_if_fail (gst_structure_validate_name (name), NULL);
/* Calculate size of varargs */
va_copy (copy, varargs);
while (field_copy) {
type_copy = va_arg (copy, GType);
G_VALUE_COLLECT_SKIP (type_copy, copy);
field_copy = va_arg (copy, gchar *);
len++;
}
va_end (copy);
structure =
gst_structure_new_id_empty_with_size (g_quark_from_string (name), len);
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_LEN (structure);
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);
_structure_append_val (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_LEN (structure);
for (i = 0; i < len; i++) {
field = GST_STRUCTURE_FIELD (structure, i);
if (G_IS_VALUE (&field->value)) {
g_value_unset (&field->value);
}
}
if (GST_STRUCTURE_IS_USING_DYNAMIC_ARRAY (structure))
g_free (((GstStructureImpl *) structure)->fields);
#ifdef USE_POISONING
memset (structure, 0xff, sizeof (GstStructure));
#endif
GST_TRACE ("free structure %p", structure);
g_free (structure);
}
/**
* gst_clear_structure: (skip)
* @structure_ptr: a pointer to a #GstStructure reference
*
* Clears a reference to a #GstStructure.
*
* @structure_ptr must not be %NULL.
*
* If the reference is %NULL then this function does nothing.
* Otherwise, the structure is free'd using gst_structure_free() and the
* pointer is set to %NULL.
*
* A macro is also included that allows this function to be used without
* pointer casts.
*
* Since: 1.16
**/
#undef gst_clear_structure
void
gst_clear_structure (GstStructure ** structure_ptr)
{
g_clear_pointer (structure_ptr, gst_structure_free);
}
/**
* gst_structure_take:
* @oldstr_ptr: (inout) (transfer full) (nullable): pointer to a place of
* a #GstStructure to take
* @newstr: (transfer full) (allow-none): a new #GstStructure
*
* Atomically modifies a pointer to point to a new structure.
* The #GstStructure @oldstr_ptr is pointing to is freed and
* @newstr is taken ownership over.
*
* Either @newstr and the value pointed to by @oldstr_ptr may be %NULL.
*
* It is a programming error if both @newstr and the value pointed to by
* @oldstr_ptr refer to the same, non-%NULL structure.
*
* Returns: %TRUE if @newstr was different from @oldstr_ptr
*
* Since: 1.18
*/
gboolean
gst_structure_take (GstStructure ** oldstr_ptr, GstStructure * newstr)
{
GstStructure *oldstr;
g_return_val_if_fail (oldstr_ptr != NULL, FALSE);
do {
oldstr = g_atomic_pointer_get ((gpointer *) oldstr_ptr);
if (G_UNLIKELY (oldstr == newstr)) {
g_return_val_if_fail (newstr == NULL, FALSE);
return FALSE;
}
} while (G_UNLIKELY (!g_atomic_pointer_compare_and_exchange ((gpointer *)
oldstr_ptr, oldstr, newstr)));
if (oldstr)
gst_structure_free (oldstr);
return TRUE;
}
/**
* 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);
g_free (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. Fields that
* weren't already part of the structure are added as needed.
* 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);
G_VALUE_COLLECT_INIT (&field.value, type, varargs, 0, &err);
if (G_UNLIKELY (err)) {
g_critical ("%s", err);
g_free (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;
va_list copy;
guint len = 0;
GQuark quark_copy = field_quark;
GType type_copy;
g_return_val_if_fail (name_quark != 0, NULL);
g_return_val_if_fail (field_quark != 0, NULL);
va_start (varargs, field_quark);
/* Calculate size of varargs */
va_copy (copy, varargs);
while (quark_copy) {
type_copy = va_arg (copy, GType);
G_VALUE_COLLECT_SKIP (type_copy, copy);
quark_copy = va_arg (copy, GQuark);
len++;
}
va_end (copy);
s = gst_structure_new_id_empty_with_size (name_quark, len);
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;
GType field_value_type;
guint i, len;
len = GST_STRUCTURE_LEN (structure);
field_value_type = G_VALUE_TYPE (&field->value);
if (field_value_type == G_TYPE_STRING) {
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 (field_value_type == 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;
}
}
_structure_append_val (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_LEN (structure);
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: (nullable): 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: (nullable): 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_LEN (structure);
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);
}
_structure_remove_index (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_LEN (structure) - 1; i >= 0; i--) {
field = GST_STRUCTURE_FIELD (structure, i);
if (G_IS_VALUE (&field->value)) {
g_value_unset (&field->value);
}
_structure_remove_index (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_LEN (structure);
}
/**
* 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_LEN (structure), 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()
* and gst_structure_filter_and_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_LEN (structure);
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_LEN (structure);
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_filter_and_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 the fields.
* In contrast to gst_structure_map_in_place(), the field is removed from
* the structure if %FALSE is returned from the function.
* The structure must be mutable.
*
* Since: 1.6
*/
void
gst_structure_filter_and_map_in_place (GstStructure * structure,
GstStructureFilterMapFunc func, gpointer user_data)
{
guint i, len;
GstStructureField *field;
gboolean ret;
g_return_if_fail (structure != NULL);
g_return_if_fail (IS_MUTABLE (structure));
g_return_if_fail (func != NULL);
len = GST_STRUCTURE_LEN (structure);
for (i = 0; i < len;) {
field = GST_STRUCTURE_FIELD (structure, i);
ret = func (field->name, &field->value, user_data);
if (!ret) {
if (G_IS_VALUE (&field->value)) {
g_value_unset (&field->value);
}
_structure_remove_index (structure, i);
len = GST_STRUCTURE_LEN (structure);
} else {
i++;
}
}
}
/**
* 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 || G_VALUE_TYPE (&field->value) != G_TYPE_BOOLEAN)
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 || G_VALUE_TYPE (&field->value) != G_TYPE_INT)
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 || G_VALUE_TYPE (&field->value) != G_TYPE_UINT)
return FALSE;
*value = gst_g_value_get_uint_unchecked (&field->value);
return TRUE;
}
/**
* gst_structure_get_int64:
* @structure: a #GstStructure
* @fieldname: the name of a field
* @value: (out): a pointer to a #gint64 to set
*
* Sets the #gint64 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 #gint64, this function
* returns %FALSE.
*
* Since: 1.4
*/
gboolean
gst_structure_get_int64 (const GstStructure * structure,
const gchar * fieldname, gint64 * 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 || G_VALUE_TYPE (&field->value) != G_TYPE_INT64)
return FALSE;
*value = gst_g_value_get_int64_unchecked (&field->value);
return TRUE;
}
/**
* gst_structure_get_uint64:
* @structure: a #GstStructure
* @fieldname: the name of a field
* @value: (out): a pointer to a #guint64 to set
*
* Sets the #guint64 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 #guint64, this function
* returns %FALSE.
*
* Since: 1.4
*/
gboolean
gst_structure_get_uint64 (const GstStructure * structure,
const gchar * fieldname, guint64 * 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 || G_VALUE_TYPE (&field->value) != G_TYPE_UINT64)
return FALSE;
*value = gst_g_value_get_uint64_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 || G_VALUE_TYPE (&field->value) != G_TYPE_DATE)
return FALSE;
/* FIXME: 2.0 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 2.0: 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)
{
return gst_structure_get_uint64 (structure, fieldname, value);
}
/**
* 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 || G_VALUE_TYPE (&field->value) != G_TYPE_DOUBLE)
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: (nullable): 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 || G_VALUE_TYPE (&field->value) != G_TYPE_STRING)
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 || G_VALUE_TYPE (&field->value) != GST_TYPE_FRACTION)
return FALSE;
*value_numerator = gst_value_get_fraction_numerator (&field->value);
*value_denominator = gst_value_get_fraction_denominator (&field->value);
return TRUE;
}
/**
* gst_structure_get_flagset:
* @structure: a #GstStructure
* @fieldname: the name of a field
* @value_flags: (out) (allow-none): a pointer to a guint for the flags field
* @value_mask: (out) (allow-none): a pointer to a guint for the mask field
*
* Read the GstFlagSet flags and mask out of the structure into the
* provided pointers.
*
* Returns: %TRUE if the values could be set correctly. If there was no field
* with @fieldname or the existing field did not contain a GstFlagSet, this
* function returns %FALSE.
*
* Since: 1.6
*/
gboolean
gst_structure_get_flagset (const GstStructure * structure,
const gchar * fieldname, guint * value_flags, guint * value_mask)
{
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 || !GST_VALUE_HOLDS_FLAG_SET (&field->value))
return FALSE;
if (value_flags)
*value_flags = gst_value_get_flagset_flags (&field->value);
if (value_mask)
*value_mask = gst_value_get_flagset_mask (&field->value);
return TRUE;
}
static GType
gst_structure_value_get_generic_type (const GValue * val)
{
if (G_VALUE_TYPE (val) == GST_TYPE_LIST
|| G_VALUE_TYPE (val) == GST_TYPE_ARRAY) {
GArray *array = g_value_peek_pointer (val);
/* Note, we can do this because the internal
* GstValueList/GstValueArray implementation is API/ABI compatible
* with GArray */
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_LEN (structure);
for (i = 0; i < len; i++) {
char *t;
GType type;
field = GST_STRUCTURE_FIELD (structure, i);
if (G_VALUE_TYPE (&field->value) == GST_TYPE_ARRAY) {
t = _priv_gst_value_serialize_any_list (&field->value, "< ", " >", FALSE);
} else if (G_VALUE_TYPE (&field->value) == GST_TYPE_LIST) {
t = _priv_gst_value_serialize_any_list (&field->value, "{ ", " }", FALSE);
} else {
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, _priv_gst_value_gtype_to_abbr (type));
g_string_append_c (s, ')');
if (t) {
g_string_append (s, t);
g_free (t);
} else if (G_TYPE_CHECK_VALUE_TYPE (&field->value, G_TYPE_POINTER)) {
gpointer ptr = g_value_get_pointer (&field->value);
if (!ptr)
g_string_append (s, "NULL");
else
g_string_append_printf (s, "%p", ptr);
} else {
if (!G_TYPE_CHECK_VALUE_TYPE (&field->value, G_TYPE_STRING))
GST_WARNING ("No value transform to serialize field '%s' of type '%s'",
g_quark_to_string (field->name),
_priv_gst_value_gtype_to_abbr (type));
/* TODO(ensonic): don't print NULL if field->value is not empty */
g_string_append (s, "NULL");
}
}
g_string_append_c (s, ';');
return TRUE;
}
gboolean
priv__gst_structure_append_template_to_gstring (GQuark field_id,
const GValue * value, gpointer user_data)
{
GType type = gst_structure_value_get_generic_type (value);
GString *s = (GString *) user_data;
g_string_append_len (s, ", ", 2);
/* FIXME: do we need to escape fieldnames? */
g_string_append (s, g_quark_to_string (field_id));
g_string_append_len (s, "=(", 2);
g_string_append (s, _priv_gst_value_gtype_to_abbr (type));
g_string_append_c (s, ')');
//TODO(ensonic): table like GstStructureAbbreviation (or extend it)
if (type == G_TYPE_INT) {
g_string_append_len (s, "%i", 2);
} else if (type == G_TYPE_UINT) {
g_string_append_len (s, "%u", 2);
} else if (type == G_TYPE_FLOAT) {
g_string_append_len (s, "%f", 2);
} else if (type == G_TYPE_DOUBLE) {
g_string_append_len (s, "%lf", 3);
} else if (type == G_TYPE_STRING) {
g_string_append_len (s, "%s", 2);
} else if (type == G_TYPE_BOOLEAN) {
/* we normally store this as a string, but can parse it also from an int */
g_string_append_len (s, "%i", 2);
} else if (type == G_TYPE_INT64) {
g_string_append (s, "%" G_GINT64_FORMAT);
} else if (type == G_TYPE_UINT64) {
g_string_append (s, "%" G_GUINT64_FORMAT);
} else if (type == GST_TYPE_STRUCTURE) {
g_string_append (s, "%" GST_WRAPPED_PTR_FORMAT);
} else if (g_type_is_a (type, G_TYPE_ENUM)
|| g_type_is_a (type, G_TYPE_FLAGS)) {
g_string_append_len (s, "%i", 2);
} else if (type == G_TYPE_GTYPE) {
g_string_append_len (s, "%s", 2);
} else if (type == G_TYPE_POINTER) {
g_string_append_len (s, "%p", 2);
} else {
GST_WARNING ("unhandled type: %s", g_type_name (type));
g_string_append (s, "%" GST_WRAPPED_PTR_FORMAT);
}
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:
* |[<!-- language="C" -->
* GST_LOG ("structure is %" GST_PTR_FORMAT, structure);
* ]|
* This prints the structure in human readable form.
*
* The current implementation of serialization will lead to unexpected results
* when there are nested #GstCaps / #GstStructure deeper than one level.
*
* 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);
}
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 (!_priv_gst_value_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 (!_priv_gst_value_parse_value (s, &s, &field->value,
G_TYPE_INVALID))) {
GST_WARNING ("failed to parse value %s", str);
return FALSE;
}
*after = s;
return TRUE;
}
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 (!_priv_gst_value_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_new_from_string:
* @string: a string representation of a #GstStructure
*
* 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.
*
* The current implementation of serialization will lead to unexpected results
* when there are nested #GstCaps / #GstStructure deeper than one level.
*
* Free-function: gst_structure_free
*
* Returns: (transfer full) (nullable): a new #GstStructure or %NULL
* when the string could not be parsed. Free with
* gst_structure_free() after use.
*
* Since: 1.2
*/
GstStructure *
gst_structure_new_from_string (const gchar * string)
{
return gst_structure_from_string (string, NULL);
}
/**
* gst_structure_from_string: (constructor):
* @string: a string representation of a #GstStructure.
* @end: (out) (allow-none) (transfer none) (skip): 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) (nullable): 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 min, max, step;
min = gst_value_get_int_range_min (value);
max = gst_value_get_int_range_max (value);
step = gst_value_get_int_range_step (value);
target = CLAMP (target, min, max);
if (G_UNLIKELY (step != 1)) {
gint rem = target % step;
target -= rem;
if (rem > step / 2)
target += step;
}
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);
g_return_val_if_fail (target_denominator != 0, 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_LEN (structure1) != GST_STRUCTURE_LEN (structure2)) {
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
*
* Intersects @struct1 and @struct2 and returns the intersection.
*
* Returns: (nullable): 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);
}
static gboolean
_gst_structure_get_any_list (GstStructure * structure, GType type,
const gchar * fieldname, GValueArray ** array)
{
GstStructureField *field;
GValue val = G_VALUE_INIT;
g_return_val_if_fail (structure != NULL, FALSE);
g_return_val_if_fail (fieldname != NULL, FALSE);
g_return_val_if_fail (array != NULL, FALSE);
field = gst_structure_get_field (structure, fieldname);
if (field == NULL || G_VALUE_TYPE (&field->value) != type)
return FALSE;
g_value_init (&val, G_TYPE_VALUE_ARRAY);
if (g_value_transform (&field->value, &val)) {
*array = g_value_get_boxed (&val);
return TRUE;
}
g_value_unset (&val);
return FALSE;
}
/**
* gst_structure_get_array:
* @structure: a #GstStructure
* @fieldname: the name of a field
* @array: (out): a pointer to a #GValueArray
*
* This is useful in language bindings where unknown #GValue types are not
* supported. This function will convert the %GST_TYPE_ARRAY into a newly
* allocated #GValueArray and return it through @array. Be aware that this is
* slower then getting the #GValue directly.
*
* Returns: %TRUE if the value could be set correctly. If there was no field
* with @fieldname or the existing field did not contain a %GST_TYPE_ARRAY,
* this function returns %FALSE.
*/
gboolean
gst_structure_get_array (GstStructure * structure, const gchar * fieldname,
GValueArray ** array)
{
return _gst_structure_get_any_list (structure, GST_TYPE_ARRAY, fieldname,
array);
}
/**
* gst_structure_get_list:
* @structure: a #GstStructure
* @fieldname: the name of a field
* @array: (out): a pointer to a #GValueArray
*
* This is useful in language bindings where unknown #GValue types are not
* supported. This function will convert the %GST_TYPE_LIST into a newly
* allocated GValueArray and return it through @array. Be aware that this is
* slower then getting the #GValue directly.
*
* Returns: %TRUE if the value could be set correctly. If there was no field
* with @fieldname or the existing field did not contain a %GST_TYPE_LIST, this
* function returns %FALSE.
*
* Since: 1.12
*/
gboolean
gst_structure_get_list (GstStructure * structure, const gchar * fieldname,
GValueArray ** array)
{
return _gst_structure_get_any_list (structure, GST_TYPE_LIST, fieldname,
array);
}
static void
_gst_structure_set_any_list (GstStructure * structure, GType type,
const gchar * fieldname, const GValueArray * array)
{
GValue arval = G_VALUE_INIT;
GValue value = G_VALUE_INIT;
g_return_if_fail (structure != NULL);
g_return_if_fail (fieldname != NULL);
g_return_if_fail (array != NULL);
g_return_if_fail (IS_MUTABLE (structure));
g_value_init (&value, type);
g_value_init (&arval, G_TYPE_VALUE_ARRAY);
g_value_set_static_boxed (&arval, array);
if (g_value_transform (&arval, &value)) {
gst_structure_id_set_value_internal (structure,
g_quark_from_string (fieldname), &value);
} else {
g_warning ("Failed to convert a GValueArray");
}
g_value_unset (&arval);
g_value_unset (&value);
}
/**
* gst_structure_set_array:
* @structure: a #GstStructure
* @fieldname: the name of a field
* @array: a pointer to a #GValueArray
*
* This is useful in language bindings where unknown GValue types are not
* supported. This function will convert a @array to %GST_TYPE_ARRAY and set
* the field specified by @fieldname. Be aware that this is slower then using
* %GST_TYPE_ARRAY in a #GValue directly.
*
* Since: 1.12
*/
void
gst_structure_set_array (GstStructure * structure, const gchar * fieldname,
const GValueArray * array)
{
_gst_structure_set_any_list (structure, GST_TYPE_ARRAY, fieldname, array);
}
/**
* gst_structure_set_list:
* @structure: a #GstStructure
* @fieldname: the name of a field
* @array: a pointer to a #GValueArray
*
* This is useful in language bindings where unknown GValue types are not
* supported. This function will convert a @array to %GST_TYPE_LIST and set
* the field specified by @fieldname. Be aware that this is slower then using
* %GST_TYPE_LIST in a #GValue directly.
*
* Since: 1.12
*/
void
gst_structure_set_list (GstStructure * structure, const gchar * fieldname,
const GValueArray * array)
{
_gst_structure_set_any_list (structure, GST_TYPE_LIST, fieldname, array);
}
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