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avutil/eval: add sgn()

This commit is contained in:
Paul B Mahol 2019-10-11 21:44:09 +02:00
parent 72704cbff4
commit 961d6493e8
2 changed files with 7 additions and 0 deletions
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3
doc/utils.texi
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@ -920,6 +920,9 @@ corresponding input value will be returned.
@item round(expr)
Round the value of expression @var{expr} to the nearest integer. For example, "round(1.5)" is "2.0".
@item sgn(x)
Compute sign of @var{x}.
@item sin(x)
Compute sine of @var{x}.

4
libavutil/eval.c
View File

@ -163,6 +163,7 @@ struct AVExpr {
e_last, e_st, e_while, e_taylor, e_root, e_floor, e_ceil, e_trunc, e_round,
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_atan2, e_lerp,
e_sgn,
} type;
double value; // is sign in other types
union {
@ -197,6 +198,7 @@ static double eval_expr(Parser *p, AVExpr *e)
case e_ceil : return e->value * ceil (eval_expr(p, e->param[0]));
case e_trunc: return e->value * trunc(eval_expr(p, e->param[0]));
case e_round: return e->value * round(eval_expr(p, e->param[0]));
case e_sgn: return e->value * FFDIFFSIGN(eval_expr(p, e->param[0]), 0);
case e_sqrt: return e->value * sqrt (eval_expr(p, e->param[0]));
case e_not: return e->value * (eval_expr(p, e->param[0]) == 0);
case e_if: return e->value * (eval_expr(p, e->param[0]) ? eval_expr(p, e->param[1]) :
@ -470,6 +472,7 @@ static int parse_primary(AVExpr **e, Parser *p)
else if (strmatch(next, "clip" )) d->type = e_clip;
else if (strmatch(next, "atan2" )) d->type = e_atan2;
else if (strmatch(next, "lerp" )) d->type = e_lerp;
else if (strmatch(next, "sgn" )) d->type = e_sgn;
else {
for (i=0; p->func1_names && p->func1_names[i]; i++) {
if (strmatch(next, p->func1_names[i])) {
@ -657,6 +660,7 @@ static int verify_expr(AVExpr *e)
case e_sqrt:
case e_not:
case e_random:
case e_sgn:
return verify_expr(e->param[0]) && !e->param[1];
case e_print:
return verify_expr(e->param[0])