gstreamer/libs/gst/control/unitconvert.h

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/* GStreamer
* Copyright (C) 2001 Steve Baker <stevebaker_org@yahoo.co.uk>
*
* unitconvert.c: Conversion between units of measurement
*
* 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_UNITCONVERT_H__
#define __GST_UNITCONVERT_H__
#include <gst/gstobject.h>
G_BEGIN_DECLS
#define GST_TYPE_UNIT_CONVERT (gst_unitconv_get_type ())
#define GST_UNIT_CONVERT(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_UNIT_CONVERT,GstUnitConvert))
#define GST_UNIT_CONVERT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GST_TYPE_UNIT_CONVERT,GstUnitConvert))
#define GST_IS_UNIT_CONVERT(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_UNIT_CONVERT))
#define GST_IS_UNIT_CONVERT_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_UNIT_CONVERT))
#define GST_UNIT_CONVERT_NAME(unitconv) (GST_OBJECT_NAME(unitconv))
#define GST_UNIT_CONVERT_PARENT(unitconv) (GST_OBJECT_PARENT(unitconv))
typedef struct _GstUnitConvertClass GstUnitConvertClass;
typedef struct _GstUnitConvert GstUnitConvert;
typedef void (*GstUnitConvertFunc) (GstUnitConvert *unitconv, GValue *from_val, GValue *to_val);
struct _GstUnitConvert {
GstObject object;
GHashTable *convert_params;
GSList *convert_func_chain;
GSList *temp_gvalues;
};
struct _GstUnitConvertClass {
GstObjectClass parent_class;
/* signal callbacks */
};
GstUnitConvert* gst_unitconv_new (void);
void _gst_unitconv_initialize (void);
gboolean gst_unitconv_set_convert_units(GstUnitConvert *unitconv, gchar *from_unit_named, gchar *to_unit_named);
gboolean gst_unitconv_convert_value(GstUnitConvert *unitconv, GValue *from_value, GValue *to_value);
GParamSpec* gst_unitconv_unit_spec(gchar *unit_name);
gboolean gst_unitconv_unit_exists(gchar *unit_name);
gboolean gst_unitconv_unit_is_logarithmic(gchar *unit_name);
gboolean gst_unitconv_register_unit(const gchar *domain_name,
gboolean is_domain_default,
gboolean is_logarithmic,
GParamSpec *unit_spec);
gboolean gst_unitconv_register_convert_func(gchar *from_unit_named, gchar *to_unit_named, GstUnitConvertFunc convert_func);
gboolean gst_unitconv_register_convert_property(gchar *unit_name, GParamSpec *convert_prop_spec);
G_END_DECLS
#endif /* __GST_UNITCONVERT_H__ */