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adds functions gst_cast_float and gst_cast_double. Will use lrint and lrintf if available and a pure c rounding macro...

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Original commit message from CVS:
adds functions gst_cast_float and gst_cast_double. Will use lrint and lrintf if available and a pure c rounding macro if not.

This is where optimised asm alternatives can be placed - omega, this means you!

However you have to prove that your asm version is faster than lrintf ;)
This commit is contained in:
Steve Baker 2002-04-26 09:21:14 +00:00
parent e9ab9a2b9d
commit 21702eee6e
1 changed files with 54 additions and 0 deletions
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54
gst-libs/gst/floatcast/floatcast.h Normal file
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/* 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.
*/
#ifndef __FLOATCAST_H__
#define __FLOATCAST_H__
#include <config.h>
#if (HAVE_LRINT && 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
/* use a standard c cast, but do rounding correctly */
#define gst_cast_float(x) ((x)>=0?(gint)((x)+0.5):(gint)((x)-0.5))
#define gst_cast_double(x) ((x)>=0?(gint)((x)+0.5):(gint)((x)-0.5))
#endif
#endif /* __FLOATCAST_H__ */