[FFmpeg-cvslog] Revert "mathematics.h: remove a couple of math defines"

[Carl Eugen Hoyos]

ffmpeg | branch: master | Carl Eugen Hoyos <cehoyos at ag.or.at> | Fri Jun 22 16:10:42 2012 +0200| [15bde060844b7d32af80b352834ba5f33cab55d1] | committer: Carl Eugen Hoyos

Revert "mathematics.h: remove a couple of math defines"

This reverts commit a2b186a188c126dd0402414d9e8198ec4df63ebe.

The defines were present for several years, removing
them without a version bump may break API.
(Fixes MPlayer compilation.)

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=15bde060844b7d32af80b352834ba5f33cab55d1
---

 libavutil/mathematics.h |   18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/libavutil/mathematics.h b/libavutil/mathematics.h
index 844747e..93314ba 100644
--- a/libavutil/mathematics.h
+++ b/libavutil/mathematics.h
@@ -26,12 +26,30 @@
 #include "attributes.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_LOG2_10
 #define M_LOG2_10      3.32192809488736234787  /* log_2 10 */
 #endif
 #ifndef M_PHI
 #define M_PHI          1.61803398874989484820   /* phi / golden ratio */
 #endif
+#ifndef M_PI
+#define M_PI           3.14159265358979323846  /* pi */
+#endif
+#ifndef M_SQRT1_2
+#define M_SQRT1_2      0.70710678118654752440  /* 1/sqrt(2) */
+#endif
+#ifndef M_SQRT2
+#define M_SQRT2        1.41421356237309504880  /* sqrt(2) */
+#endif
 #ifndef NAN
 #define NAN            (0.0/0.0)
 #endif