> 在 2019年10月12日,03:45,Paul B Mahol <one...@gmail.com> 写道: > > Signed-off-by: Paul B Mahol <one...@gmail.com> > --- > 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". > > +@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]) > -- > 2.17.1 > > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel > > To unsubscribe, visit link above, or email > ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
lgtm Thanks Steven _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".