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define some math constants so as not to depend on _XOPEN_SOURCE

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Originally committed as revision 14725 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Aurelien Jacobs 2008-08-13 10:04:59 +00:00
parent 29d3ed3be6
commit d1a12956a0
1 changed files with 14 additions and 0 deletions
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14
libavutil/mathematics.h
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@ -22,8 +22,22 @@
#define FFMPEG_MATHEMATICS_H
#include <stdint.h>
#include <math.h>
#include "rational.h"
#ifndef M_E
#define M_E 2.7182818284590452354 /* e */
#endif
#ifndef M_LN2
#define M_LN2 0.69314718055994530942 /* log_e 2 */
#endif
#ifndef M_LN10
#define M_LN10 2.30258509299404568402 /* log_e 10 */
#endif
#ifndef M_SQRT1_2
#define M_SQRT1_2 0.70710678118654752440 /* 1/sqrt(2) */
#endif
enum AVRounding {
AV_ROUND_ZERO = 0, ///< round toward zero
AV_ROUND_INF = 1, ///< round away from zero