[FFmpeg-cvslog] avutil/eval: add sgn()
Paul B Mahol
git at videolan.org
Sat Oct 12 11:19:09 EEST 2019
ffmpeg | branch: master | Paul B Mahol <onemda at gmail.com> | Fri Oct 11 21:44:09 2019 +0200| [961d6493e8c2846032dfda6f9dba557a98b02de4] | committer: Paul B Mahol
avutil/eval: add sgn()
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=961d6493e8c2846032dfda6f9dba557a98b02de4
---
doc/utils.texi | 3 +++
libavutil/eval.c | 4 ++++
2 files changed, 7 insertions(+)
diff --git a/doc/utils.texi b/doc/utils.texi
index d55dd315c3..4e2e713505 100644
--- a/doc/utils.texi
+++ b/doc/utils.texi
@@ -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".
+ at item sgn(x)
+Compute sign of @var{x}.
+
@item sin(x)
Compute sine of @var{x}.
diff --git a/libavutil/eval.c b/libavutil/eval.c
index 5da9a6d83b..48832979e2 100644
--- a/libavutil/eval.c
+++ b/libavutil/eval.c
@@ -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])
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