M_PI               46 3rdparty/include/ffmpeg_/libavutil/mathematics.h #define M_PI           3.14159265358979323846  /* pi */
M_PI              684 3rdparty/libtiff/tif_luv.c #define M_PI		3.14159265358979323846
M_PI               51 3rdparty/openexr/Imath/ImathPlatform.h     #define M_PI    3.14159265358979323846