vf_select: remove mathematical constants now redundant.

Signed-off-by: Nicolas George <nicolas.george@normalesup.org>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

doc/filters.texi

@@ -1744,15 +1744,6 @@ is selected and passed to the output, otherwise it is discarded.
 The expression can contain the following constants:
 
 @table @option
-@item PI
-Greek PI
-
-@item PHI
-golden ratio
-
-@item E
-Euler number
-
 @item n
 the sequential number of the filtered frame, starting from 0
 

libavfilter/vf_select.c

@@ -28,10 +28,6 @@
 #include "avfilter.h"
 
 static const char *var_names[] = {
-    "E",                 ///< Euler number
-    "PHI",               ///< golden ratio
-    "PI",                ///< greek pi
-
     "TB",                ///< timebase
 
     "pts",               ///< original pts in the file of the frame
@@ -69,10 +65,6 @@ static const char *var_names[] = {
 };
 
 enum var_name {
-    VAR_E,
-    VAR_PHI,
-    VAR_PI,
-
     VAR_TB,
 
     VAR_PTS,
@@ -146,10 +138,6 @@ static int config_input(AVFilterLink *inlink)
 {
     SelectContext *select = inlink->dst->priv;
 
-    select->var_values[VAR_E]   = M_E;
-    select->var_values[VAR_PHI] = M_PHI;
-    select->var_values[VAR_PI]  = M_PI;
-
     select->var_values[VAR_N]          = 0.0;
     select->var_values[VAR_SELECTED_N] = 0.0;