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avutil/eval: add atan2 function 

Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2017-01-29 10:26:16 +01:00
parent 036e12b225
commit 13564fc24d
2 changed files with 6 additions and 1 deletions
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3
doc/utils.texi
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@ -776,6 +776,9 @@ Compute arcsine of @var{x}.
@item atan(x)
Compute arctangent of @var{x}.
@item atan2(x, y)
Compute principal value of the arc tangent of @var{y}/@var{x}.
@item between(x, min, max)
Return 1 if @var{x} is greater than or equal to @var{min} and lesser than or
equal to @var{max}, 0 otherwise.

4
libavutil/eval.c
View File

@ -155,7 +155,7 @@ struct AVExpr {
e_pow, e_mul, e_div, e_add,
e_last, e_st, e_while, e_taylor, e_root, e_floor, e_ceil, e_trunc,
e_sqrt, e_not, e_random, e_hypot, e_gcd,
e_if, e_ifnot, e_print, e_bitand, e_bitor, e_between, e_clip
e_if, e_ifnot, e_print, e_bitand, e_bitor, e_between, e_clip, e_atan2
} type;
double value; // is sign in other types
union {
@ -306,6 +306,7 @@ static double eval_expr(Parser *p, AVExpr *e)
case e_last:return e->value * d2;
case e_st : return e->value * (p->var[av_clip(d, 0, VARS-1)]= d2);
case e_hypot:return e->value * hypot(d, d2);
case e_atan2:return e->value * atan2(d, d2);
case e_bitand: return isnan(d) || isnan(d2) ? NAN : e->value * ((long int)d & (long int)d2);
case e_bitor: return isnan(d) || isnan(d2) ? NAN : e->value * ((long int)d | (long int)d2);
}
@ -452,6 +453,7 @@ static int parse_primary(AVExpr **e, Parser *p)
else if (strmatch(next, "bitor" )) d->type = e_bitor;
else if (strmatch(next, "between"))d->type = e_between;
else if (strmatch(next, "clip" )) d->type = e_clip;
else if (strmatch(next, "atan2" )) d->type = e_atan2;
else {
for (i=0; p->func1_names && p->func1_names[i]; i++) {
if (strmatch(next, p->func1_names[i])) {