gstreamer/gst/gststructure.c

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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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <gst/gst.h>
#include <gobject/gvaluecollector.h>
typedef struct _GstStructureField GstStructureField;
struct _GstStructureField
{
GQuark name;
GValue value;
};
#define GST_STRUCTURE_FIELD(structure, index) \
&g_array_index((structure)->fields, GstStructureField, (index))
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_get_type (void)
{
static GType gst_structure_type;
if (!gst_structure_type) {
gst_structure_type = g_boxed_type_register_static ("GstStructure",
(GBoxedCopyFunc) gst_structure_copy_conditional,
(GBoxedFreeFunc) gst_structure_free);
g_value_register_transform_func (gst_structure_type, G_TYPE_STRING,
gst_structure_transform_to_string);
}
return gst_structure_type;
}
/**
* gst_structure_id_empty_new:
* @quark: name of new structure
*
* Creates a new, empty #GstStructure with the given name.
*
* Returns: a new, empty #GstStructure
*/
GstStructure *
gst_structure_id_empty_new (GQuark quark)
{
GstStructure *structure;
g_return_val_if_fail (quark != 0, NULL);
structure = g_new0 (GstStructure, 1);
structure->name = quark;
structure->fields = g_array_new (FALSE, TRUE, sizeof (GstStructureField));
return structure;
}
/**
* gst_structure_empty_new:
* @name: name of new structure
*
* Creates a new, empty #GstStructure with the given name.
*
* Returns: a new, empty #GstStructure
*/
GstStructure *
gst_structure_empty_new (const gchar * name)
{
GstStructure *structure;
g_return_val_if_fail (name != NULL, NULL);
structure = g_new0 (GstStructure, 1);
structure->name = g_quark_from_string (name);
structure->fields = g_array_new (FALSE, TRUE, sizeof (GstStructureField));
return structure;
}
/**
* 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.
*
* Returns: a new #GstStructure
*/
GstStructure *
gst_structure_new (const gchar * name, const gchar * firstfield, ...)
{
GstStructure *structure;
va_list varargs;
g_return_val_if_fail (name != NULL, NULL);
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.
*
* Returns: a new #GstStructure
*/
GstStructure *
gst_structure_new_valist (const gchar * name,
const gchar * firstfield, va_list varargs)
{
GstStructure *structure;
g_return_val_if_fail (name != NULL, NULL);
structure = gst_structure_empty_new (name);
gst_structure_set_valist (structure, firstfield, varargs);
return structure;
}
/**
* gst_structure_copy:
* @structure: a #GstStructure to duplicate
*
* Duplicates a #GstStructure and all its fields and values.
*
* Returns: a new #GstStructure.
*/
GstStructure *
gst_structure_copy (const GstStructure * structure)
{
GstStructure *new_structure;
GstStructureField *field;
int i;
g_return_val_if_fail (structure != NULL, NULL);
new_structure = gst_structure_empty_new (g_quark_to_string (structure->name));
new_structure->name = structure->name;
for (i = 0; i < structure->fields->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 (new_structure->fields, new_field);
}
return new_structure;
}
/**
* gst_structure_free:
* @structure: the #GstStructure to free
*
* Frees a #GstStructure and all its fields and values.
*/
void
gst_structure_free (GstStructure * structure)
{
GstStructureField *field;
int i;
g_return_if_fail (structure != NULL);
for (i = 0; i < structure->fields->len; i++) {
field = GST_STRUCTURE_FIELD (structure, i);
if (G_IS_VALUE (&field->value)) {
g_value_unset (&field->value);
}
}
#ifdef USE_POISONING
memset (structure, 0xff, sizeof (GstStructure));
#endif
g_free (structure);
}
/**
* gst_structure_get_name:
* @structure: a #GstStructure
*
* Accessor fuction.
*
* 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_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.
*/
void
gst_structure_set_name (GstStructure * structure, const gchar * name)
{
g_return_if_fail (structure != NULL);
g_return_if_fail (name != NULL);
structure->name = g_quark_from_string (name);
}
/**
* 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 ID to the provided value. If the field
* does not exist, it is created. If the field exists, the previous
* value is freed.
*/
void
gst_structure_id_set_value (GstStructure * structure,
GQuark field, const GValue * value)
{
GstStructureField gsfield = { 0, {0,} };
g_return_if_fail (structure != NULL);
g_return_if_fail (G_IS_VALUE (value));
gsfield.name = field;
gst_value_init_and_copy (&gsfield.value, value);
gst_structure_set_field (structure, &gsfield);
}
/**
* 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 to the provided value. If the field
* does not exist, it is created. If the field exists, the previous
* value is 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));
gst_structure_id_set_value (structure, g_quark_from_string (fieldname),
value);
}
/**
* 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. 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);
va_start (varargs, field);
gst_structure_set_valist (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)
{
GType type;
int i;
double d;
char *s;
g_return_if_fail (structure != NULL);
while (fieldname) {
GstStructureField field = { 0 };
field.name = g_quark_from_string (fieldname);
type = va_arg (varargs, GType);
switch (type) {
case G_TYPE_INT:
i = va_arg (varargs, int);
g_value_init (&field.value, G_TYPE_INT);
g_value_set_int (&field.value, i);
break;
case G_TYPE_DOUBLE:
d = va_arg (varargs, double);
g_value_init (&field.value, G_TYPE_DOUBLE);
g_value_set_double (&field.value, d);
break;
case G_TYPE_BOOLEAN:
i = va_arg (varargs, int);
g_value_init (&field.value, G_TYPE_BOOLEAN);
g_value_set_boolean (&field.value, i);
break;
case G_TYPE_STRING:
s = va_arg (varargs, char *);
g_value_init (&field.value, G_TYPE_STRING);
g_value_set_string (&field.value, s);
break;
default:
if (type == GST_TYPE_FOURCC) {
i = va_arg (varargs, int);
g_value_init (&field.value, GST_TYPE_FOURCC);
gst_value_set_fourcc (&field.value, i);
} else if (type == GST_TYPE_INT_RANGE) {
int min, max;
min = va_arg (varargs, int);
max = va_arg (varargs, int);
g_value_init (&field.value, GST_TYPE_INT_RANGE);
gst_value_set_int_range (&field.value, min, max);
} else if (type == GST_TYPE_DOUBLE_RANGE) {
double min, max;
min = va_arg (varargs, double);
max = va_arg (varargs, double);
g_value_init (&field.value, GST_TYPE_DOUBLE_RANGE);
gst_value_set_double_range (&field.value, min, max);
} else {
g_critical ("unimplemented vararg field type %d\n", (int) type);
return;
}
break;
}
gst_structure_set_field (structure, &field);
fieldname = va_arg (varargs, gchar *);
}
}
/**
* gst_structure_set_field:
* @structure: a #GstStructure
* @field: the #GstStructureField to set
*
* Sets a field in the structure. 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.
*
* This function is intended mainly for internal use. The function
* #gst_structure_set() is recommended instead of this one.
*/
static void
gst_structure_set_field (GstStructure * structure, GstStructureField * field)
{
GstStructureField *f;
int i;
for (i = 0; i < structure->fields->len; i++) {
f = GST_STRUCTURE_FIELD (structure, i);
if (f->name == field->name) {
g_value_unset (&f->value);
memcpy (f, field, sizeof (GstStructureField));
return;
}
}
g_array_append_val (structure->fields, *field);
}
/* FIXME: is this private ? if so remove gtk-doc
* gst_structure_id_get_field:
* @structure: a #GstStructure
* @field_id: the GQuark of the field to get
*
* Gets the specified field from the structure. If there is no
* field with the given ID, NULL is returned.
*
* Returns: the #GstStructureField with the given ID
*/
static GstStructureField *
gst_structure_id_get_field (const GstStructure * structure, GQuark field_id)
{
GstStructureField *field;
int i;
g_return_val_if_fail (structure != NULL, NULL);
for (i = 0; i < structure->fields->len; i++) {
field = GST_STRUCTURE_FIELD (structure, i);
if (field->name == field_id)
return field;
}
return NULL;
}
/**
* gst_structure_get_field:
* @structure: a #GstStructure
* @fieldname: the name of the field to get
*
* Gets the specified field from the structure. If there is no
* field with the given ID, NULL is returned.
*
* Returns: the #GstStructureField with the given name
*/
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
*
* Accessor function.
*
* 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
*
* Accessor function.
*
* 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;
int i;
g_return_if_fail (structure != NULL);
g_return_if_fail (fieldname != NULL);
id = g_quark_from_string (fieldname);
for (i = 0; i < structure->fields->len; i++) {
field = GST_STRUCTURE_FIELD (structure, i);
if (field->name == id) {
if (G_IS_VALUE (&field->value)) {
g_value_unset (&field->value);
}
structure->fields = g_array_remove_index (structure->fields, i);
return;
}
}
}
/**
* gst_structure_remove_fields:
* @structure: a #GstStructure
* @fieldname: the name of the field to remove
* @...: NULL-terminated list of more fieldnames to remove
*
* Removes the field 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);
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
*
* Removes the field with the given names. If a field does not exist, the
* argument is ignored.
*/
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);
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);
for (i = structure->fields->len - 1; i >= 0; i--) {
field = GST_STRUCTURE_FIELD (structure, i);
if (G_IS_VALUE (&field->value)) {
g_value_unset (&field->value);
}
structure->fields = g_array_remove_index (structure->fields, i);
}
}
/**
* gst_structure_get_field_type:
* @structure: a #GstStructure
* @fieldname: the name of the field
*
* Finds the field with the given name, and returns the type of the
* value it contains. If the field is not found, G_TYPE_INVALID is
* returned.
*
* Returns: the #GValue of the field
*/
GType
gst_structure_get_field_type (const GstStructure * structure,
const gchar * fieldname)
{
GstStructureField *field;
g_return_val_if_fail (structure != NULL, G_TYPE_INVALID);
g_return_val_if_fail (fieldname != NULL, G_TYPE_INVALID);
field = gst_structure_get_field (structure, fieldname);
if (field == NULL)
return G_TYPE_INVALID;
return G_VALUE_TYPE (&field->value);
}
/**
* gst_structure_n_fields:
* @structure: a #GstStructure
*
* Accessor function.
*
* Returns: the number of fields in the structure
*/
gint
gst_structure_n_fields (const GstStructure * structure)
{
g_return_val_if_fail (structure != NULL, 0);
return structure->fields->len;
}
/**
* gst_structure_foreach:
* @structure: a #GstStructure
* @func: a function to call for each field
* @user_data: private data
*
* Calls the provided function once for each field in the #GstStructure.
*
* Returns: TRUE if the supplied function returns TRUE For each of the fields,
* FALSE otherwise.
*/
gboolean
gst_structure_foreach (GstStructure * structure,
GstStructureForeachFunc func, gpointer user_data)
{
int i;
GstStructureField *field;
gboolean ret;
for (i = 0; i < structure->fields->len; i++) {
field = GST_STRUCTURE_FIELD (structure, i);
ret = func (field->name, &field->value, user_data);
if (!ret)
return FALSE;
}
return TRUE;
}
/**
* gst_structure_has_field:
* @structure: a #GstStructure
* @fieldname: the name of a field
*
* Accessor function.
*
* Returns: TRUE if the structure contains a field with the given name
*/
gboolean
gst_structure_has_field (const GstStructure * structure,
const gchar * fieldname)
{
GstStructureField *field;
g_return_val_if_fail (structure != NULL, 0);
g_return_val_if_fail (fieldname != NULL, 0);
field = gst_structure_get_field (structure, fieldname);
return (field != NULL);
}
/**
* gst_structure_has_field_typed:
* @structure: a #GstStructure
* @fieldname: the name of a field
* @type: the type of a value
*
* Accessor function.
*
* Returns: TRUE if the structure contains a field with the given name and type
*/
gboolean
gst_structure_has_field_typed (const GstStructure * structure,
const gchar * fieldname, GType type)
{
GstStructureField *field;
g_return_val_if_fail (structure != NULL, 0);
g_return_val_if_fail (fieldname != NULL, 0);
field = gst_structure_get_field (structure, fieldname);
if (field == NULL)
return FALSE;
return (G_VALUE_TYPE (&field->value) == type);
}
/* utility functions */
/**
* gst_structure_get_boolean:
* @structure: a #GstStructure
* @fieldname: the name of a field
* @value: a pointer to a #gboolean to set
*
* Sets the boolean pointed to by @value corresponding to the value of the
* given field. Caller is responsible for making sure the field exists
* and has the correct type.
*
* Returns: TRUE if the value could be set correctly
*/
gboolean
gst_structure_get_boolean (const GstStructure * structure,
const gchar * fieldname, gboolean * value)
{
GstStructureField *field;
g_return_val_if_fail (structure != NULL, FALSE);
g_return_val_if_fail (fieldname != NULL, FALSE);
field = gst_structure_get_field (structure, fieldname);
if (field == NULL)
return FALSE;
if (!G_VALUE_HOLDS_BOOLEAN (&field->value))
return FALSE;
*value = g_value_get_boolean (&field->value);
return TRUE;
}
/**
* gst_structure_get_int:
* @structure: a #GstStructure
* @fieldname: the name of a field
* @value: a pointer to an int to set
*
* Sets the int pointed to by @value corresponding to the value of the
* given field. Caller is responsible for making sure the field exists
* and has the correct type.
*
* Returns: TRUE if the value could be set correctly
*/
gboolean
gst_structure_get_int (const GstStructure * structure,
const gchar * fieldname, gint * value)
{
GstStructureField *field;
g_return_val_if_fail (structure != NULL, FALSE);
g_return_val_if_fail (fieldname != NULL, FALSE);
g_return_val_if_fail (value != NULL, FALSE);
field = gst_structure_get_field (structure, fieldname);
if (field == NULL)
return FALSE;
if (!G_VALUE_HOLDS_INT (&field->value))
return FALSE;
*value = g_value_get_int (&field->value);
return TRUE;
}
/**
* gst_structure_get_fourcc:
* @structure: a #GstStructure
* @fieldname: the name of a field
* @value: a pointer to a #GstFourcc to set
*
* Sets the #GstFourcc pointed to by @value corresponding to the value of the
* given field. Caller is responsible for making sure the field exists
* and has the correct type.
*
* Returns: TRUE if the value could be set correctly
*/
gboolean
gst_structure_get_fourcc (const GstStructure * structure,
const gchar * fieldname, guint32 * value)
{
GstStructureField *field;
g_return_val_if_fail (structure != NULL, FALSE);
g_return_val_if_fail (fieldname != NULL, FALSE);
g_return_val_if_fail (value != NULL, FALSE);
field = gst_structure_get_field (structure, fieldname);
if (field == NULL)
return FALSE;
if (!GST_VALUE_HOLDS_FOURCC (&field->value))
return FALSE;
*value = gst_value_get_fourcc (&field->value);
return TRUE;
}
/**
* gst_structure_get_double:
* @structure: a #GstStructure
* @fieldname: the name of a field
* @value: a pointer to a #GstFourcc to set
*
* Sets the double pointed to by @value corresponding to the value of the
* given field. Caller is responsible for making sure the field exists
* and has the correct type.
*
* Returns: TRUE if the value could be set correctly
*/
gboolean
gst_structure_get_double (const GstStructure * structure,
const gchar * fieldname, gdouble * value)
{
GstStructureField *field;
g_return_val_if_fail (structure != NULL, FALSE);
g_return_val_if_fail (fieldname != NULL, FALSE);
g_return_val_if_fail (value != NULL, FALSE);
field = gst_structure_get_field (structure, fieldname);
if (field == NULL)
return FALSE;
if (!G_VALUE_HOLDS_DOUBLE (&field->value))
return FALSE;
*value = g_value_get_double (&field->value);
return TRUE;
}
/**
* gst_structure_get_string:
* @structure: a #GstStructure
* @fieldname: the name of a field
*
* Finds the field corresponding to @fieldname, and returns the string
* contained in the field's value. Caller is responsible for making
* sure the field exists and has the correct type.
*
* The string should not be modified, and remains valid until the next
* call to a gst_structure_*() function with the given structure.
*
* Returns: a pointer to the string
*/
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 FALSE;
if (!G_VALUE_HOLDS_STRING (&field->value))
return FALSE;
return g_value_get_string (&field->value);
}
typedef struct _GstStructureAbbreviation
{
char *type_name;
GType type;
}
GstStructureAbbreviation;
static GstStructureAbbreviation gst_structure_abbrs[] = {
{"int", G_TYPE_INT},
{"i", G_TYPE_INT},
{"float", G_TYPE_FLOAT},
{"f", G_TYPE_FLOAT},
{"double", G_TYPE_DOUBLE},
{"d", G_TYPE_DOUBLE},
//{ "fourcc", GST_TYPE_FOURCC },
{"boolean", G_TYPE_BOOLEAN},
{"bool", G_TYPE_BOOLEAN},
{"b", G_TYPE_BOOLEAN},
{"string", G_TYPE_STRING},
{"str", G_TYPE_STRING},
{"s", G_TYPE_STRING}
};
static GType
gst_structure_from_abbr (const char *type_name)
{
int i;
g_return_val_if_fail (type_name != NULL, G_TYPE_INVALID);
for (i = 0; i < G_N_ELEMENTS (gst_structure_abbrs); i++) {
if (strcmp (type_name, gst_structure_abbrs[i].type_name) == 0) {
return gst_structure_abbrs[i].type;
}
}
/* FIXME shouldn't be a special case */
if (strcmp (type_name, "fourcc") == 0 || strcmp (type_name, "4") == 0) {
return GST_TYPE_FOURCC;
}
return g_type_from_name (type_name);
}
static const char *
gst_structure_to_abbr (GType type)
{
int i;
g_return_val_if_fail (type != G_TYPE_INVALID, NULL);
for (i = 0; i < G_N_ELEMENTS (gst_structure_abbrs); i++) {
if (type == gst_structure_abbrs[i].type) {
return gst_structure_abbrs[i].type_name;
}
}
/* FIXME shouldn't be a special case */
if (type == GST_TYPE_FOURCC) {
return "fourcc";
}
return g_type_name (type);
}
#define GST_ASCII_IS_STRING(c) (g_ascii_isalnum((c)) || ((c) == '_') || \
((c) == '-') || ((c) == '+') || ((c) == '/') || ((c) == ':') || \
((c) == '.'))
/**
* gst_structure_to_string:
* @structure: a #GstStructure
*
* Converts @structure to a human-readable representation.
*
* Returns: a pointer to string allocated by g_malloc()
*/
gchar *
gst_structure_to_string (const GstStructure * structure)
{
GstStructureField *field;
GString *s;
int i;
/* 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);
s = g_string_new ("");
/* FIXME this string may need to be escaped */
g_string_append_printf (s, "%s", g_quark_to_string (structure->name));
for (i = 0; i < structure->fields->len; i++) {
char *t;
GType type;
field = GST_STRUCTURE_FIELD (structure, i);
t = gst_value_serialize (&field->value);
type = G_VALUE_TYPE (&field->value);
if (type == GST_TYPE_LIST) {
GArray *array = g_value_peek_pointer (&field->value);
if (array->len > 0) {
GValue *value = &g_array_index (array, GValue, 0);
type = G_VALUE_TYPE (value);
} else {
type = G_TYPE_INT;
}
} else if (G_VALUE_TYPE (&field->value) == GST_TYPE_INT_RANGE) {
type = G_TYPE_INT;
} else if (G_VALUE_TYPE (&field->value) == GST_TYPE_DOUBLE_RANGE) {
type = G_TYPE_DOUBLE;
}
g_string_append_printf (s, ", %s=(%s)%s", g_quark_to_string (field->name),
gst_structure_to_abbr (type), t);
g_free (t);
}
return g_string_free (s, FALSE);
}
/*
* r will still point to the string. if end == next, the string will not be
* null-terminated. In all other cases it will be.
* end = pointer to char behind end of string, next = pointer to start of
* unread data.
* THIS FUNCTION MODIFIES THE STRING AND DETECTS INSIDE A NONTERMINATED STRING
*/
static gboolean
gst_structure_parse_string (gchar * s, gchar ** end, gchar ** next)
{
gchar *w;
if (*s == 0)
return FALSE;
if (*s != '"') {
int ret;
ret = gst_structure_parse_simple_string (s, end);
*next = *end;
return ret;
}
w = s;
s++;
while (*s != '"') {
if (*s == 0)
return FALSE;
if (*s == '\\') {
s++;
}
*w = *s;
w++;
s++;
}
s++;
*end = w;
*next = s;
return TRUE;
}
static gboolean
gst_structure_parse_range (gchar * s, gchar ** after, GValue * value,
GType type)
{
GValue value1 = { 0 };
GValue value2 = { 0 };
GType range_type;
gboolean ret;
if (*s != '[')
return FALSE;
s++;
ret = gst_structure_parse_value (s, &s, &value1, type);
if (ret == FALSE)
return FALSE;
while (g_ascii_isspace (*s))
s++;
if (*s != ',')
return FALSE;
s++;
while (g_ascii_isspace (*s))
s++;
ret = gst_structure_parse_value (s, &s, &value2, type);
if (ret == FALSE)
return FALSE;
while (g_ascii_isspace (*s))
s++;
if (*s != ']')
return FALSE;
s++;
if (G_VALUE_TYPE (&value1) != G_VALUE_TYPE (&value2))
return FALSE;
if (G_VALUE_TYPE (&value1) == G_TYPE_DOUBLE) {
range_type = GST_TYPE_DOUBLE_RANGE;
} else if (G_VALUE_TYPE (&value1) == G_TYPE_INT) {
range_type = GST_TYPE_INT_RANGE;
} else {
return FALSE;
}
g_value_init (value, range_type);
if (range_type == GST_TYPE_DOUBLE_RANGE) {
gst_value_set_double_range (value, g_value_get_double (&value1),
g_value_get_double (&value2));
} else {
gst_value_set_int_range (value, g_value_get_int (&value1),
g_value_get_int (&value2));
}
*after = s;
return TRUE;
}
static gboolean
gst_structure_parse_list (gchar * s, gchar ** after, GValue * value, GType type)
{
GValue list_value = { 0 };
gboolean ret;
GArray *array;
g_value_init (value, GST_TYPE_LIST);
array = g_value_peek_pointer (value);
if (*s != '{')
return FALSE;
s++;
while (g_ascii_isspace (*s))
s++;
if (*s == '}') {
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 != '}') {
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_simple_string (gchar * str, gchar ** end)
{
char *s = str;
while (GST_ASCII_IS_STRING (*s)) {
s++;
}
*end = s;
return (s != str);
}
static gboolean
gst_structure_parse_field (gchar * str,
gchar ** after, GstStructureField * field)
{
gchar *name;
gchar *name_end;
gchar *s;
gchar c;
s = str;
while (g_ascii_isspace (*s))
s++;
name = s;
if (!gst_structure_parse_simple_string (s, &name_end))
return FALSE;
s = name_end;
while (g_ascii_isspace (*s))
s++;
if (*s != '=')
return FALSE;
s++;
c = *name_end;
*name_end = 0;
field->name = g_quark_from_string (name);
*name_end = c;
if (!gst_structure_parse_value (s, &s, &field->value, G_TYPE_INVALID))
return FALSE;
*after = s;
return TRUE;
}
static gboolean
gst_structure_parse_value (gchar * str,
gchar ** after, GValue * value, GType default_type)
{
gchar *type_name;
gchar *type_end;
gchar *value_s;
gchar *value_end;
gchar *s;
gchar c;
int ret = 0;
GType type = default_type;
s = str;
while (g_ascii_isspace (*s))
s++;
type_name = NULL;
if (*s == '(') {
type = G_TYPE_INVALID;
s++;
while (g_ascii_isspace (*s))
s++;
type_name = s;
if (!gst_structure_parse_simple_string (s, &type_end))
return FALSE;
s = type_end;
while (g_ascii_isspace (*s))
s++;
if (*s != ')')
return FALSE;
s++;
while (g_ascii_isspace (*s))
s++;
c = *type_end;
*type_end = 0;
type = gst_structure_from_abbr (type_name);
*type_end = c;
if (type == G_TYPE_INVALID)
return FALSE;
}
while (g_ascii_isspace (*s))
s++;
if (*s == '[') {
ret = gst_structure_parse_range (s, &s, value, type);
} else if (*s == '{') {
ret = gst_structure_parse_list (s, &s, value, type);
} else {
value_s = s;
if (!gst_structure_parse_string (s, &value_end, &s))
return FALSE;
c = *value_end;
*value_end = 0;
if (type == G_TYPE_INVALID) {
GType try_types[] = { G_TYPE_INT, G_TYPE_DOUBLE, G_TYPE_STRING };
int i;
for (i = 0; i < 3; i++) {
g_value_init (value, try_types[i]);
ret = gst_value_deserialize (value, value_s);
if (ret)
break;
g_value_unset (value);
}
} else {
g_value_init (value, type);
ret = gst_value_deserialize (value, value_s);
}
*value_end = c;
}
*after = s;
return ret;
}
/**
* gst_structure_from_string:
* @string: a string representation of a #GstStructure.
* @end: FIXME, deduce from code
*
* Creates a #GstStructure from a string representation.
*
* Returns: a new #GstStructure
*/
GstStructure *
gst_structure_from_string (const gchar * string, gchar ** end)
{
char *name;
char *copy;
char *w;
char *r;
char save;
GstStructure *structure = NULL;
GstStructureField field = { 0 };
g_return_val_if_fail (string != NULL, NULL);
copy = g_strdup (string);
r = copy;
name = r;
if (!gst_structure_parse_string (r, &w, &r))
goto error;
while (g_ascii_isspace (*r))
r++;
if (*r != 0 && *r != ';' && *r != ',')
goto error;
save = *w;
*w = 0;
structure = gst_structure_empty_new (name);
*w = save;
while (*r && (*r != ';')) {
if (*r != ',')
goto error;
r++;
while (*r && g_ascii_isspace (*r))
r++;
memset (&field, 0, sizeof (field));
if (!gst_structure_parse_field (r, &r, &field))
goto error;
gst_structure_set_field (structure, &field);
while (*r && g_ascii_isspace (*r))
r++;
}
if (end)
*end = (char *) string + (r - copy);
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;
}