mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-18 15:51:11 +00:00
21702eee6e
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 ;)
54 lines
1.7 KiB
C
54 lines
1.7 KiB
C
/* 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__ */
|
|
|