gstreamer/gst/gstcaps.c

1337 lines
31 KiB
C
Raw Normal View History

/* GStreamer
* Copyright (C) <2003> David A. Schleef <ds@schleef.org>
*
* 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>
#define CAPS_POISON(caps) G_STMT_START{ \
if (caps) { \
GstCaps *_newcaps = gst_caps_copy (caps); \
gst_caps_free(caps); \
caps = _newcaps; \
} \
} G_STMT_END
#define STRUCTURE_POISON(structure) G_STMT_START{ \
if (structure) { \
GstStructure *_newstruct = gst_structure_copy (structure); \
gst_structure_free(structure); \
structure = _newstruct; \
} \
} G_STMT_END
static void gst_caps_transform_to_string (const GValue * src_value,
GValue * dest_value);
static gboolean gst_caps_from_string_inplace (GstCaps * caps,
const gchar * string);
static GstCaps *gst_caps_copy_conditional (const GstCaps * src);
GType
gst_caps_get_type (void)
{
static GType gst_caps_type = 0;
if (!gst_caps_type) {
gst_caps_type = g_boxed_type_register_static ("GstCaps",
(GBoxedCopyFunc) gst_caps_copy_conditional,
(GBoxedFreeFunc) gst_caps_free);
g_value_register_transform_func (gst_caps_type,
G_TYPE_STRING, gst_caps_transform_to_string);
}
return gst_caps_type;
}
/* creation/deletion */
/**
* gst_caps_new_empty:
*
* Creates a new #GstCaps that is empty. That is, the returned
* #GstCaps contains no media formats.
*
* Returns: the new #GstCaps
*/
GstCaps *
gst_caps_new_empty (void)
{
GstCaps *caps = g_new0 (GstCaps, 1);
caps->type = GST_TYPE_CAPS;
caps->structs = g_ptr_array_new ();
return caps;
}
/**
* gst_caps_new_empty:
*
* Creates a new #GstCaps that indicates that it is compatible with
* any media format.
*
* Returns: the new #GstCaps
*/
GstCaps *
gst_caps_new_any (void)
{
GstCaps *caps = g_new0 (GstCaps, 1);
caps->type = GST_TYPE_CAPS;
caps->structs = g_ptr_array_new ();
caps->flags = GST_CAPS_FLAGS_ANY;
return caps;
}
/**
* gst_caps_new_simple:
* @media_type: the media type of the structure
* @fieldname: first field to set
* @...: additional arguments
*
* Creates a new #GstCaps that contains one #GstStructure. The
* structure is defined by the arguments, which have the same format
* as @gst_structure_new().
*
* Returns: the new #GstCaps
*/
GstCaps *
gst_caps_new_simple (const char *media_type, const char *fieldname, ...)
{
GstCaps *caps;
GstStructure *structure;
va_list var_args;
caps = g_new0 (GstCaps, 1);
caps->type = GST_TYPE_CAPS;
caps->structs = g_ptr_array_new ();
va_start (var_args, fieldname);
structure = gst_structure_new_valist (media_type, fieldname, var_args);
va_end (var_args);
gst_caps_append_structure (caps, structure);
return caps;
}
/**
* gst_caps_new_full:
* @struct1: the first structure to add
* @...: additional structures to add
*
* Creates a new #GstCaps and adds all the structures listed as
* arguments. The list must be NULL-terminated. The structures
* are not copied; the returned #GstCaps owns the structures.
*
* Returns: the new #GstCaps
*/
GstCaps *
gst_caps_new_full (GstStructure * struct1, ...)
{
GstCaps *caps;
va_list var_args;
va_start (var_args, struct1);
caps = gst_caps_new_full_valist (struct1, var_args);
va_end (var_args);
return caps;
}
/**
* gst_caps_new_full_valist:
* @structure: the first structure to add
* @var_args: additional structures to add
*
* Creates a new #GstCaps and adds all the structures listed as
* arguments. The list must be NULL-terminated. The structures
* are not copied; the returned #GstCaps owns the structures.
*
* Returns: the new #GstCaps
*/
GstCaps *
gst_caps_new_full_valist (GstStructure * structure, va_list var_args)
{
GstCaps *caps;
caps = g_new0 (GstCaps, 1);
caps->type = GST_TYPE_CAPS;
caps->structs = g_ptr_array_new ();
while (structure) {
gst_caps_append_structure (caps, structure);
structure = va_arg (var_args, GstStructure *);
}
return caps;
}
/**
* gst_caps_copy:
* @caps: the #GstCaps to copy
*
* Deeply copies a #GstCaps, including all structures and all the
* structures' values.
*
* Returns: the new #GstCaps
*/
GstCaps *
gst_caps_copy (const GstCaps * caps)
{
GstCaps *newcaps;
GstStructure *structure;
int i;
g_return_val_if_fail (caps != NULL, NULL);
newcaps = g_new0 (GstCaps, 1);
newcaps->type = GST_TYPE_CAPS;
newcaps->flags = caps->flags;
newcaps->structs = g_ptr_array_new ();
for (i = 0; i < caps->structs->len; i++) {
structure = gst_caps_get_structure (caps, i);
gst_caps_append_structure (newcaps, gst_structure_copy (structure));
}
return newcaps;
}
/**
* gst_caps_free:
* @caps: the #GstCaps to free
*
* Frees a #GstCaps and all its structures and the structures'
* values.
*/
void
gst_caps_free (GstCaps * caps)
{
GstStructure *structure;
int i;
g_return_if_fail (caps != NULL);
for (i = 0; i < caps->structs->len; i++) {
structure = gst_caps_get_structure (caps, i);
gst_structure_free (structure);
}
g_ptr_array_free (caps->structs, TRUE);
#ifdef USE_POISONING
memset (caps, 0xff, sizeof (GstCaps));
#endif
g_free (caps);
}
/**
* gst_static_caps_get:
* @static_caps: the #GstStaticCaps to convert
*
* Converts a #GstStaticCaps to a #GstCaps.
*
* Returns: the new #GstCaps
*/
const GstCaps *
gst_static_caps_get (GstStaticCaps * static_caps)
{
GstCaps *caps = (GstCaps *) static_caps;
gboolean ret;
if (caps->type == 0) {
caps->type = GST_TYPE_CAPS;
caps->structs = g_ptr_array_new ();
ret = gst_caps_from_string_inplace (caps, static_caps->string);
if (!ret) {
g_critical ("Could not convert static caps \"%s\"", static_caps->string);
}
}
return caps;
}
/* manipulation */
/**
* gst_caps_append:
* @caps1: the #GstCaps that will be appended to
* @caps2: the #GstCaps to append
*
* Appends the structures contained in @caps2 to @caps1. The structures
* in @caps2 are not copied -- they are transferred to @caps1, and then
* @caps2 is freed.
*/
void
gst_caps_append (GstCaps * caps1, GstCaps * caps2)
{
GstStructure *structure;
int i;
g_return_if_fail (caps1 != NULL);
g_return_if_fail (caps2 != NULL);
#ifdef USE_POISONING
CAPS_POISON (caps2);
#endif
for (i = 0; i < caps2->structs->len; i++) {
structure = gst_caps_get_structure (caps2, i);
gst_caps_append_structure (caps1, structure);
}
g_ptr_array_free (caps2->structs, TRUE);
#ifdef USE_POISONING
memset (caps2, 0xff, sizeof (GstCaps));
#endif
g_free (caps2);
}
/**
* gst_caps_append_structure:
* @caps: the #GstCaps that will be appended to
* @structure: the #GstStructure to append
*
* Appends @structure to @caps. The structure is not copied; @caps
* becomes the owner of @structure.
*/
void
gst_caps_append_structure (GstCaps * caps, GstStructure * structure)
{
g_return_if_fail (caps != NULL);
if (structure) {
#if 0
#ifdef USE_POISONING
STRUCTURE_POISON (structure);
#endif
#endif
g_ptr_array_add (caps->structs, structure);
}
}
/**
* gst_caps_split_one:
* @caps:
*
* This function is not implemented.
*
* Returns:
*/
GstCaps *
gst_caps_split_one (GstCaps * caps)
{
/* FIXME */
g_critical ("unimplemented");
return NULL;
}
/**
* gst_caps_get_size:
* @caps: a #GstCaps
*
* Gets the number of structures contained in @caps.
*
* Returns: the number of structures that @caps contains
*/
int
gst_caps_get_size (const GstCaps * caps)
{
g_return_val_if_fail (caps != NULL, 0);
return caps->structs->len;
}
/**
* gst_caps_get_structure:
* @caps: a #GstCaps
* @index: the index of the structure
*
* Finds the structure in @caps that has the index @index, and
* returns it.
*
* WARNING: This function takes a const GstCaps *, but returns a
* non-const GstStructure *. This is for programming convenience --
* the caller should be aware that structures inside a constant
* @GstCaps should not be modified.
*
* Returns: a pointer to the #GstStructure corresponding to @index
*/
GstStructure *
gst_caps_get_structure (const GstCaps * caps, int index)
{
g_return_val_if_fail (caps != NULL, NULL);
g_return_val_if_fail (index >= 0, NULL);
g_return_val_if_fail (index < caps->structs->len, NULL);
return g_ptr_array_index (caps->structs, index);
}
/**
* gst_caps_copy_1:
* @caps: the @GstCaps to copy
*
* Creates a new @GstCaps and appends a copy of the first structure
* contained in @caps.
*
* Returns: the new @GstCaps
*/
GstCaps *
gst_caps_copy_1 (const GstCaps * caps)
{
GstCaps *newcaps;
GstStructure *structure;
g_return_val_if_fail (caps != NULL, NULL);
newcaps = g_new0 (GstCaps, 1);
newcaps->type = GST_TYPE_CAPS;
newcaps->flags = caps->flags;
newcaps->structs = g_ptr_array_new ();
if (caps->structs->len > 0) {
structure = gst_caps_get_structure (caps, 0);
gst_caps_append_structure (newcaps, gst_structure_copy (structure));
}
return newcaps;
}
/**
* gst_caps_set_simple:
* @caps: the @GstCaps to set
* @field: first field to set
* @...: additional parameters
*
* Sets fields in a simple #GstCaps. A simple #GstCaps is one that
* only has one structure. The arguments must be passed in the same
* manner as @gst_structure_set(), and be NULL-terminated.
*/
void
gst_caps_set_simple (GstCaps * caps, char *field, ...)
{
GstStructure *structure;
va_list var_args;
g_return_if_fail (caps != NULL);
g_return_if_fail (caps->structs->len == 1);
structure = gst_caps_get_structure (caps, 0);
va_start (var_args, field);
gst_structure_set_valist (structure, field, var_args);
va_end (var_args);
}
/**
* gst_caps_set_simple_valist:
* @caps: the @GstCaps to copy
* @field: first field to set
* @varargs: additional parameters
*
* Sets fields in a simple #GstCaps. A simple #GstCaps is one that
* only has one structure. The arguments must be passed in the same
* manner as @gst_structure_set(), and be NULL-terminated.
*/
void
gst_caps_set_simple_valist (GstCaps * caps, char *field, va_list varargs)
{
GstStructure *structure;
g_return_if_fail (caps != NULL);
g_return_if_fail (caps->structs->len != 1);
structure = gst_caps_get_structure (caps, 0);
gst_structure_set_valist (structure, field, varargs);
}
/* tests */
/**
* gst_caps_is_any:
* @caps: the @GstCaps to test
*
* Determines if @caps represents any media format.
*
* Returns: TRUE if @caps represents any format.
*/
gboolean
gst_caps_is_any (const GstCaps * caps)
{
g_return_val_if_fail (caps != NULL, FALSE);
return (caps->flags & GST_CAPS_FLAGS_ANY);
}
/**
* gst_caps_is_empty:
* @caps: the @GstCaps to test
*
* Determines if @caps represents no media formats.
*
* Returns: TRUE if @caps represents no formats.
*/
gboolean
gst_caps_is_empty (const GstCaps * caps)
{
g_return_val_if_fail (caps != NULL, FALSE);
if (caps->flags & GST_CAPS_FLAGS_ANY)
return FALSE;
return (caps->structs == NULL) || (caps->structs->len == 0);
}
/**
* gst_caps_is_chained:
* @caps: the @GstCaps to test
*
* Determines if @caps contains multiple #GstStructures.
*
* This function is deprecated, and should not be used in new code.
* Use #gst_caps_is_simple() instead.
*
* Returns: TRUE if @caps contains more than one structure
*/
gboolean
gst_caps_is_chained (const GstCaps * caps)
{
g_return_val_if_fail (caps != NULL, FALSE);
return (caps->structs->len > 1);
}
static gboolean
gst_caps_is_fixed_foreach (GQuark field_id, GValue * value, gpointer unused)
{
GType type = G_VALUE_TYPE (value);
if (G_TYPE_IS_FUNDAMENTAL (type))
return TRUE;
if (type == GST_TYPE_FOURCC)
return TRUE;
return FALSE;
}
/**
* gst_caps_is_fixed:
* @caps: the @GstCaps to test
*
* Fixed @GstCaps describe exactly one format, that is, they have exactly
* one structure, and each field in the structure describes a fixed type.
* Examples of non-fixed types are GST_TYPE_INT_RANGE and GST_TYPE_LIST.
*
* Returns: TRUE if @caps is fixed
*/
gboolean
gst_caps_is_fixed (const GstCaps * caps)
{
GstStructure *structure;
g_return_val_if_fail (caps != NULL, FALSE);
if (caps->structs->len != 1)
return FALSE;
structure = gst_caps_get_structure (caps, 0);
return gst_structure_foreach (structure, gst_caps_is_fixed_foreach, NULL);
}
static gboolean
gst_structure_is_equal_foreach (GQuark field_id, GValue * val2, gpointer data)
{
GstStructure *struct1 = (GstStructure *) data;
const GValue *val1 = gst_structure_id_get_value (struct1, field_id);
if (val1 == NULL)
return FALSE;
if (gst_value_compare (val1, val2) == GST_VALUE_EQUAL) {
return TRUE;
}
return FALSE;
}
/**
* gst_caps_is_equal_fixed:
* @caps1: the #GstCaps to test
* @caps2: the #GstCaps to test
*
* Tests if two #GstCaps are equal. This function only works on fixed
* #GstCaps.
*
* Returns: TRUE if the arguments represent the same format
*/
gboolean
gst_caps_is_equal_fixed (const GstCaps * caps1, const GstCaps * caps2)
{
GstStructure *struct1, *struct2;
g_return_val_if_fail (gst_caps_is_fixed (caps1), FALSE);
g_return_val_if_fail (gst_caps_is_fixed (caps2), FALSE);
struct1 = gst_caps_get_structure (caps1, 0);
struct2 = gst_caps_get_structure (caps2, 0);
if (struct1->name != struct2->name) {
return FALSE;
}
if (struct1->fields->len != struct2->fields->len) {
return FALSE;
}
return gst_structure_foreach (struct1, gst_structure_is_equal_foreach,
struct2);
}
static gboolean
gst_structure_field_has_compatible (GQuark field_id,
GValue * val2, gpointer data)
{
GValue dest = { 0 };
GstStructure *struct1 = (GstStructure *) data;
const GValue *val1 = gst_structure_id_get_value (struct1, field_id);
if (val1 == NULL)
return FALSE;
if (gst_value_intersect (&dest, val1, val2)) {
g_value_unset (&dest);
return TRUE;
}
return FALSE;
}
static gboolean
gst_cap_is_always_compatible (const GstStructure * struct1,
const GstStructure * struct2)
{
if (struct1->name != struct2->name) {
return FALSE;
}
/* the reversed order is important */
return gst_structure_foreach ((GstStructure *) struct2,
gst_structure_field_has_compatible, (gpointer) struct1);
}
static gboolean
gst_caps_cap_is_always_compatible (const GstStructure * struct1,
const GstCaps * caps2)
{
int i;
for (i = 0; i < caps2->structs->len; i++) {
GstStructure *struct2 = gst_caps_get_structure (caps2, i);
if (gst_cap_is_always_compatible (struct1, struct2)) {
return TRUE;
}
}
return FALSE;
}
/**
* gst_caps_is_always_compatible:
* @caps1: the #GstCaps to test
* @caps2: the #GstCaps to test
*
* A given #GstCaps structure is always compatible with another if
* every media format that is in the first is also contained in the
* second. That is, @caps1 is a subset of @caps2.
*
* Returns: TRUE if @caps1 is a subset of @caps2.
*/
gboolean
gst_caps_is_always_compatible (const GstCaps * caps1, const GstCaps * caps2)
{
int i;
g_return_val_if_fail (caps1 != NULL, FALSE);
g_return_val_if_fail (caps2 != NULL, FALSE);
if (gst_caps_is_any (caps2))
return TRUE;
if (gst_caps_is_any (caps1))
return FALSE;
if (gst_caps_is_empty (caps1))
return TRUE;
if (gst_caps_is_empty (caps2))
return FALSE;
for (i = 0; i < caps1->structs->len; i++) {
GstStructure *struct1 = gst_caps_get_structure (caps1, i);
if (gst_caps_cap_is_always_compatible (struct1, caps2) == FALSE) {
return FALSE;
}
}
return FALSE;
}
typedef struct
{
GstStructure *dest;
const GstStructure *intersect;
gboolean first_run;
}
IntersectData;
static gboolean
gst_caps_structure_intersect_field (GQuark id, GValue * val1, gpointer data)
{
IntersectData *idata = (IntersectData *) data;
GValue dest_value = { 0 };
const GValue *val2 = gst_structure_id_get_value (idata->intersect, id);
if (val2 == NULL) {
gst_structure_id_set_value (idata->dest, id, val1);
} else if (idata->first_run) {
if (gst_value_intersect (&dest_value, val1, val2)) {
gst_structure_id_set_value (idata->dest, id, &dest_value);
g_value_unset (&dest_value);
} else {
return FALSE;
}
}
return TRUE;
}
static GstStructure *
gst_caps_structure_intersect (const GstStructure * struct1,
const GstStructure * struct2)
{
IntersectData data;
g_return_val_if_fail (struct1 != NULL, NULL);
g_return_val_if_fail (struct2 != NULL, NULL);
if (struct1->name != struct2->name)
return NULL;
data.dest = gst_structure_id_empty_new (struct1->name);
data.intersect = struct2;
data.first_run = TRUE;
if (!gst_structure_foreach ((GstStructure *) struct1,
gst_caps_structure_intersect_field, &data))
goto error;
data.intersect = struct1;
data.first_run = FALSE;
if (!gst_structure_foreach ((GstStructure *) struct2,
gst_caps_structure_intersect_field, &data))
goto error;
return data.dest;
error:
gst_structure_free (data.dest);
return NULL;
}
#if 0
static GstStructure *
gst_caps_structure_union (const GstStructure * struct1,
const GstStructure * struct2)
{
int i;
GstStructure *dest;
const GstStructureField *field1;
const GstStructureField *field2;
int ret;
/* FIXME this doesn't actually work */
if (struct1->name != struct2->name)
return NULL;
dest = gst_structure_id_empty_new (struct1->name);
for (i = 0; i < struct1->fields->len; i++) {
GValue dest_value = { 0 };
field1 = GST_STRUCTURE_FIELD (struct1, i);
field2 = gst_structure_id_get_field (struct2, field1->name);
if (field2 == NULL) {
continue;
} else {
if (gst_value_union (&dest_value, &field1->value, &field2->value)) {
gst_structure_set_value (dest, g_quark_to_string (field1->name),
&dest_value);
} else {
ret = gst_value_compare (&field1->value, &field2->value);
}
}
}
return dest;
}
#endif
/* operations */
/**
* gst_caps_intersect:
* @caps1: a #GstCaps to intersect
* @caps2: a #GstCaps to intersect
*
* Creates a new #GstCaps that contains all the formats that are common
* to both @caps1 and @caps2.
*
* Returns: the new #GstCaps
*/
GstCaps *
gst_caps_intersect (const GstCaps * caps1, const GstCaps * caps2)
{
int i, j;
GstStructure *struct1;
GstStructure *struct2;
GstCaps *dest;
#if 0
GstCaps *caps;
#endif
g_return_val_if_fail (caps1 != NULL, NULL);
g_return_val_if_fail (caps2 != NULL, NULL);
if (gst_caps_is_empty (caps1) || gst_caps_is_empty (caps2)) {
return gst_caps_new_empty ();
}
if (gst_caps_is_any (caps1))
return gst_caps_copy (caps2);
if (gst_caps_is_any (caps2))
return gst_caps_copy (caps1);
dest = gst_caps_new_empty ();
for (i = 0; i < caps1->structs->len; i++) {
struct1 = gst_caps_get_structure (caps1, i);
for (j = 0; j < caps2->structs->len; j++) {
GstStructure *istruct;
struct2 = gst_caps_get_structure (caps2, j);
istruct = gst_caps_structure_intersect (struct1, struct2);
gst_caps_append_structure (dest, istruct);
}
}
#if 0
caps = gst_caps_simplify (dest);
gst_caps_free (dest);
return caps;
#else
return dest;
#endif
}
/**
* gst_caps_union:
* @caps1: a #GstCaps to union
* @caps2: a #GstCaps to union
*
* Creates a new #GstCaps that contains all the formats that are in
* either @caps1 and @caps2.
*
* Returns: the new #GstCaps
*/
GstCaps *
gst_caps_union (const GstCaps * caps1, const GstCaps * caps2)
{
GstCaps *dest1;
GstCaps *dest2;
dest1 = gst_caps_copy (caps1);
dest2 = gst_caps_copy (caps2);
gst_caps_append (dest1, dest2);
/* FIXME: need a simplify function */
return dest1;
}
typedef struct _NormalizeForeach
{
GstCaps *caps;
GstStructure *structure;
}
NormalizeForeach;
static gboolean
gst_caps_normalize_foreach (GQuark field_id, GValue * value, gpointer ptr)
{
NormalizeForeach *nf = (NormalizeForeach *) ptr;
GValue val = { 0 };
int i;
if (G_VALUE_TYPE (value) == GST_TYPE_LIST) {
for (i = 1; i < gst_value_list_get_size (value); i++) {
const GValue *v = gst_value_list_get_value (value, i);
GstStructure *structure = gst_structure_copy (nf->structure);
gst_structure_id_set_value (structure, field_id, v);
gst_caps_append_structure (nf->caps, structure);
}
gst_value_init_and_copy (&val, gst_value_list_get_value (value, 0));
gst_structure_id_set_value (nf->structure, field_id, &val);
g_value_unset (&val);
return FALSE;
}
return TRUE;
}
/**
* gst_caps_normalize:
* @caps: a #GstCaps to normalize
*
* Creates a new #GstCaps that represents the same set of formats as
* @caps, but contains no lists. Each list is expanded into separate
* @GstStructures.
*
* Returns: the new #GstCaps
*/
GstCaps *
gst_caps_normalize (const GstCaps * caps)
{
NormalizeForeach nf;
GstCaps *newcaps;
int i;
g_return_val_if_fail (caps != NULL, NULL);
newcaps = gst_caps_copy (caps);
nf.caps = newcaps;
for (i = 0; i < newcaps->structs->len; i++) {
nf.structure = gst_caps_get_structure (newcaps, i);
while (!gst_structure_foreach (nf.structure,
gst_caps_normalize_foreach, &nf));
}
return newcaps;
}
static gboolean
simplify_foreach (GQuark field_id, GValue * value, gpointer user_data)
{
GstStructure *s2 = (GstStructure *) user_data;
const GValue *v2;
v2 = gst_structure_id_get_value (s2, field_id);
if (v2 == NULL)
return FALSE;
if (gst_value_compare (value, v2) == GST_VALUE_EQUAL)
return TRUE;
return FALSE;
}
static gboolean
gst_caps_structure_simplify (GstStructure * struct1,
const GstStructure * struct2)
{
/* FIXME this is just a simple compare. Better would be to merge
* the two structures */
if (struct1->name != struct2->name)
return FALSE;
if (struct1->fields->len != struct2->fields->len)
return FALSE;
return gst_structure_foreach (struct1, simplify_foreach, (void *) struct2);
}
/**
* gst_caps_simplify:
* @caps: a #GstCaps to simplify
*
* Creates a new #GstCaps that represents the same set of formats as
* @caps, but simpler. Component structures that are identical are
* merged. Component structures that have ranges or lists that can
* be merged are also merged.
*
* Returns: the new #GstCaps
*/
GstCaps *
gst_caps_simplify (const GstCaps * caps)
{
int i;
int j;
GstCaps *newcaps;
GstStructure *structure;
GstStructure *struct2;
if (gst_caps_get_size (caps) < 2) {
return gst_caps_copy (caps);
}
newcaps = gst_caps_new_empty ();
for (i = 0; i < gst_caps_get_size (caps); i++) {
structure = gst_caps_get_structure (caps, i);
for (j = 0; j < gst_caps_get_size (newcaps); j++) {
struct2 = gst_caps_get_structure (caps, i);
if (gst_caps_structure_simplify (struct2, structure)) {
break;
}
}
if (j == gst_caps_get_size (newcaps)) {
gst_caps_append_structure (newcaps, gst_structure_copy (structure));
}
}
return newcaps;
}
#ifndef GST_DISABLE_LOADSAVE
/**
* gst_caps_save_thyself:
* @caps: a #GstCaps structure
* @parent: a XML parent node
*
* Serializes a #GstCaps to XML and adds it as a child node of @parent.
*
* Returns: a XML node pointer
*/
xmlNodePtr
gst_caps_save_thyself (const GstCaps * caps, xmlNodePtr parent)
{
return 0;
}
/**
* gst_caps_load_thyself:
* @parent: a XML node
*
* Creates a #GstCaps from its XML serialization.
*
* Returns: a new #GstCaps structure
*/
GstCaps *
gst_caps_load_thyself (xmlNodePtr parent)
{
return NULL;
}
#endif
/* utility */
/**
* gst_caps_replace:
* @caps: a pointer to #GstCaps
* @newcaps: a #GstCaps to replace *caps
*
* Replaces *caps with @newcaps. Frees the #GstCaps in the location
* pointed to by @caps, if applicable, then modifies @caps to point to
* @newcaps.
*/
void
gst_caps_replace (GstCaps ** caps, GstCaps * newcaps)
{
#if 0 /* disable this, since too many plugins rely on undefined behavior */
#ifdef USE_POISONING
//if (newcaps) CAPS_POISON (newcaps);
#endif
#endif
if (*caps)
gst_caps_free (*caps);
*caps = newcaps;
}
/**
* gst_caps_to_string:
* @caps: a #GstCaps
*
* Converts @caps to a string representation. This string representation
* can be converted back to a #GstCaps by #gst_caps_from_string().
*
* Returns: a string representing @caps
*/
gchar *
gst_caps_to_string (const GstCaps * caps)
{
int i;
GstStructure *structure;
GString *s;
char *sstr;
/* 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_caps_to_string. In particular, calls should
* not use the GST_PTR_FORMAT extension. */
/* FIXME does this leak? */
if (caps == NULL) {
return g_strdup ("NULL");
}
if (gst_caps_is_any (caps)) {
return g_strdup ("ANY");
}
if (gst_caps_is_empty (caps)) {
return g_strdup ("EMPTY");
}
s = g_string_new ("");
structure = gst_caps_get_structure (caps, 0);
sstr = gst_structure_to_string (structure);
g_string_append (s, sstr);
g_free (sstr);
for (i = 1; i < caps->structs->len; i++) {
structure = gst_caps_get_structure (caps, i);
g_string_append (s, "; ");
sstr = gst_structure_to_string (structure);
g_string_append (s, sstr);
g_free (sstr);
}
return g_string_free (s, FALSE);
}
static gboolean
gst_caps_from_string_inplace (GstCaps * caps, const gchar * string)
{
GstStructure *structure;
gchar *s;
g_return_val_if_fail (string, FALSE);
if (strcmp ("ANY", string) == 0) {
caps->flags = GST_CAPS_FLAGS_ANY;
return TRUE;
}
if (strcmp ("NONE", string) == 0) {
return TRUE;
}
structure = gst_structure_from_string (string, &s);
if (structure == NULL) {
return FALSE;
}
gst_caps_append_structure (caps, structure);
while (*s == ';') {
s++;
while (g_ascii_isspace (*s))
s++;
structure = gst_structure_from_string (s, &s);
if (structure == NULL) {
return FALSE;
}
gst_caps_append_structure (caps, structure);
while (g_ascii_isspace (*s))
s++;
}
if (*s != 0) {
return FALSE;
}
return TRUE;
}
/**
* gst_caps_from_string:
* @string: a string to convert to #GstCaps
*
* Converts @caps from a string representation.
*
* Returns: a new #GstCaps
*/
GstCaps *
gst_caps_from_string (const gchar * string)
{
GstCaps *caps;
caps = gst_caps_new_empty ();
if (gst_caps_from_string_inplace (caps, string)) {
return caps;
} else {
gst_caps_free (caps);
return NULL;
}
}
static void
gst_caps_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_caps_to_string (src_value->data[0].v_pointer);
}
static GstCaps *
gst_caps_copy_conditional (const GstCaps * src)
{
if (src) {
return gst_caps_copy (src);
} else {
return NULL;
}
}
/* fixate utility functions */
/**
* gst_caps_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_caps_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);
value = gst_structure_get_value (structure, field_name);
if (G_VALUE_TYPE (value) == G_TYPE_INT) {
/* already fixed */
return FALSE;
} else if (G_VALUE_TYPE (value) == GST_TYPE_INT_RANGE) {
int x;
x = gst_value_get_int_range_min (value);
if (target < x)
target = x;
x = gst_value_get_int_range_max (value);
if (target > x)
target = x;
gst_structure_set (structure, field_name, G_TYPE_INT, target, NULL);
return TRUE;
} else if (G_VALUE_TYPE (value) == GST_TYPE_LIST) {
const GValue *list_value;
int i, n;
int best = 0;
int best_index = -1;
n = gst_value_list_get_size (value);
for (i = 0; i < n; i++) {
list_value = gst_value_list_get_value (value, i);
if (G_VALUE_TYPE (list_value) == G_TYPE_INT) {
int x = g_value_get_int (list_value);
if (best_index == -1 || (ABS (target - x) < ABS (best - x))) {
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_caps_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_caps_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);
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 = g_value_get_double (list_value);
if (best_index == -1 || (ABS (target - x) < ABS (best - x))) {
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;
}