gstreamer/gst/gstvalue.h

/* 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.
 */

#ifndef __GST_VALUE_H__
#define __GST_VALUE_H__

#include <gst/gstconfig.h>
#include <gst/gstcaps.h>

G_BEGIN_DECLS

#define GST_MAKE_FOURCC(a,b,c,d)        (guint32)((a)|(b)<<8|(c)<<16|(d)<<24)
#define GST_STR_FOURCC(f)               (guint32)(((f)[0])|((f)[1]<<8)|((f)[2]<<16)|((f)[3]<<24))

#define GST_FOURCC_FORMAT "%c%c%c%c"
#define GST_FOURCC_ARGS(fourcc) \
        ((gchar) ((fourcc)     &0xff)), \
        ((gchar) (((fourcc)>>8 )&0xff)), \
        ((gchar) (((fourcc)>>16)&0xff)), \
        ((gchar) (((fourcc)>>24)&0xff))

#define GST_VALUE_HOLDS_FOURCC(x)       (G_VALUE_HOLDS(x, gst_type_fourcc))
#define GST_VALUE_HOLDS_INT_RANGE(x)    (G_VALUE_HOLDS(x, gst_type_int_range))
#define GST_VALUE_HOLDS_DOUBLE_RANGE(x) (G_VALUE_HOLDS(x, gst_type_double_range))
#define GST_VALUE_HOLDS_LIST(x)		(G_VALUE_HOLDS(x, gst_type_list))
#define GST_VALUE_HOLDS_ARRAY(x)	(G_VALUE_HOLDS(x, gst_type_array))
#define GST_VALUE_HOLDS_CAPS(x)		(G_VALUE_HOLDS(x, GST_TYPE_CAPS))
#define GST_VALUE_HOLDS_FRACTION(x)	(G_VALUE_HOLDS(x, gst_type_fraction))

#define GST_TYPE_FOURCC                  gst_type_fourcc
#define GST_TYPE_INT_RANGE               gst_type_int_range
#define GST_TYPE_DOUBLE_RANGE            gst_type_double_range
#define GST_TYPE_LIST                    gst_type_list
#define GST_TYPE_ARRAY			 gst_type_array
#define GST_TYPE_FRACTION                gst_type_fraction

#define GST_VALUE_LESS_THAN              (-1)
#define GST_VALUE_EQUAL                   0
#define GST_VALUE_GREATER_THAN            1
#define GST_VALUE_UNORDERED               2

typedef int      (* GstValueCompareFunc)     (const GValue *value1,
					      const GValue *value2);
typedef char *   (* GstValueSerializeFunc)   (const GValue *value1);
typedef gboolean (* GstValueDeserializeFunc) (GValue       *dest,
					      const char   *s);
typedef int      (* GstValueUnionFunc)       (GValue       *dest,
					      const GValue *value1,
					      const GValue *value2);
typedef int      (* GstValueIntersectFunc)   (GValue       *dest,
					      const GValue *value1,
					      const GValue *value2);
typedef int      (* GstValueSubtractFunc)    (GValue       *dest,
					      const GValue *minuend,
					      const GValue *subtrahend);

typedef struct _GstValueTable GstValueTable;
struct _GstValueTable {
  GType type;
  GstValueCompareFunc compare;
  GstValueSerializeFunc serialize;
  GstValueDeserializeFunc deserialize;

  /*< private >*/
  void *_gst_reserved [GST_PADDING];
};

GST_EXPORT GType gst_type_fourcc;
GST_EXPORT GType gst_type_int_range;
GST_EXPORT GType gst_type_double_range;
GST_EXPORT GType gst_type_list;
GST_EXPORT GType gst_type_array;
GST_EXPORT GType gst_type_fraction;

void		gst_value_register		(const GstValueTable   *table);
void		gst_value_init_and_copy		(GValue                *dest,
						 const GValue          *src);

gchar *		gst_value_serialize		(const GValue          *value);
gboolean	gst_value_deserialize		(GValue                *dest,
						 const gchar           *src);

/* list */
void		gst_value_list_append_value	(GValue		*value,
						 const GValue	*append_value);
void		gst_value_list_prepend_value	(GValue		*value,
						 const GValue	*prepend_value);
void		gst_value_list_concat		(GValue		*dest,
						 const GValue   *value1,
						 const GValue	*value2);
guint		gst_value_list_get_size		(const GValue	*value);
G_CONST_RETURN GValue *
		gst_value_list_get_value	(const GValue	*value,
						 guint		index);

/* fourcc */
void		gst_value_set_fourcc		(GValue		*value,
						 guint32	fourcc);
guint32		gst_value_get_fourcc		(const GValue   *value);

/* int range */
void		gst_value_set_int_range		(GValue		*value,
						 int		start,
						 int		end);
int		gst_value_get_int_range_min	(const GValue	*value);
int		gst_value_get_int_range_max	(const GValue	*value);

/* double range */
void		gst_value_set_double_range	(GValue		*value,
						 double		start,
						 double		end);
double		gst_value_get_double_range_min	(const GValue	*value);
double		gst_value_get_double_range_max	(const GValue	*value);

/* caps */
G_CONST_RETURN GstCaps *
		gst_value_get_caps		(const GValue	*value);
void		gst_value_set_caps		(GValue		*value,
						 const GstCaps  *caps);

/* fraction */
void		gst_value_set_fraction		(GValue		*value,
						 int		numerator,
						 int		denominator);
int		gst_value_get_fraction_numerator (const GValue	*value);
int		gst_value_get_fraction_denominator(const GValue	*value);
gboolean	gst_value_fraction_multiply	(GValue		*product,
						 const GValue	*factor1,
						 const GValue	*factor2);

/* compare */
int		gst_value_compare		(const GValue	*value1,
						 const GValue	*value2);
gboolean	gst_value_can_compare		(const GValue	*value1,
						 const GValue	*value2);

/* union */
gboolean	gst_value_union			(GValue		*dest,
						 const GValue	*value1,
						 const GValue	*value2);
gboolean	gst_value_can_union		(const GValue	*value1,
						 const GValue   *value2);
void		gst_value_register_union_func	(GType		type1,
						 GType		type2,
						 GstValueUnionFunc func);

/* intersection */
gboolean	gst_value_intersect		(GValue		*dest,
						 const GValue	*value1,
						 const GValue	*value2);
gboolean	gst_value_can_intersect		(const GValue	*value1,
						 const GValue	*value2);
void		gst_value_register_intersect_func (GType	type1,
						GType		type2,
						GstValueIntersectFunc func);

/* subtraction */
gboolean	gst_value_subtract		(GValue		*dest,
						 const GValue	*minuend,
						 const GValue	*subtrahend);
gboolean	gst_value_can_subtract		(const GValue	*minuend,
						 const GValue	*subtrahend);
void		gst_value_register_subtract_func (GType		minuend_type,
						GType		subtrahend_type,
						GstValueSubtractFunc func);

/* fixation */
gboolean	gst_value_is_fixed		(const GValue   *value);

/* private */
void		_gst_value_initialize		(void);

G_END_DECLS

#endif