/* GStreamer

 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>

 * Library       <2002> Steve Baker <stevebaker_org@yahoo.co.uk>

 *

 * 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.

 */

/**

 * SECTION:gstfloatcast

 * @short_description: Floating point platform independence macros

 *

 * The floatcast.h header file contains a couple of convenience macros for

 * floating point numbers.

 *

 * If you include this header, your application or library must link against

 * libm (for maths.h support).

 *

 * For optimal results, your application's or library's build

 * system should check whether the C99 functions lrint and lrintf are supported

 * and define the preprocessor symbols HAVE_LRINT and HAVE_LRINTF if so.  If

 * you are using autoconf, you can do this by using the AC_C99_FUNC_LRINT and

 * AC_C99_FUNC_LRINTF checks in your configure.ac or configure.in file and

 * including your application's config.h header before you include floatcast.h.

 */

#ifndef __FLOATCAST_H__

#define __FLOATCAST_H__

#include <string.h>

#if defined (_MSC_VER) && !defined (inline)

#define inline __inline

#endif

G_BEGIN_DECLS

/* FIXME 0.11: these gst_cast_*() functions are not used anywhere, so we could

 * just as well get rid of them and move the float/double swap macros into

 * gstutils.h in core */

/**

 * gst_cast_float:

 * @x: input value

 *

 * Casts a 32-bit floating point value (float) to an integer without bias.

 */

/**

 * gst_cast_double:

 * @x: input value

 *

 * Casts a 64-bit floating point value (double) to an integer without bias.

 */

/* FIXME: HAVE_LRINT && HAVE_LRINTF are defined by config.h - they should

 * not be used in an installed header. */

#if defined(HAVE_LRINT) && defined(HAVE_LRINTF)

        /*      These defines enable functionality introduced with the 1999 ISO C

        **      standard. They must be defined before the inclusion of math.h to

        **      engage them. If optimisation is enabled, these functions will be 

        **      inlined. With optimisation switched off, you have to link in the

        **      maths library using -lm.

        */

        #define _ISOC9X_SOURCE  1

        #define _ISOC99_SOURCE  1

        #define __USE_ISOC9X    1

        #define __USE_ISOC99    1

        #include        <math.h>

        #define gst_cast_float(x)       ((gint)lrintf(x))

        #define gst_cast_double(x)      ((gint)lrint(x))

#else

        #include <math.h>

        /* use a standard c cast, but do rounding correctly */

        #define gst_cast_float(x)       ((gint)floor((x)+0.5))

        #define gst_cast_double(x)      ((gint)floor((x)+0.5))

#endif

G_END_DECLS

#endif /* __FLOATCAST_H__ */