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| author | Stefano Sabatini <stefano.sabatini-lala@poste.it> | 2010-11-03 19:44:00 +0000 |
|---|---|---|
| committer | Stefano Sabatini <stefano.sabatini-lala@poste.it> | 2010-11-03 19:44:00 +0000 |
| commit | 20fcd0797e15e1acd9e75da55e748e44dd6497f7 (patch) | |
| tree | 2f916d111afe4f671988edd971e7d0e47ad5d67f | |
| parent | 07851d79365e11f40619df81e39c5791ecd3abb2 (diff) | |
| download | ffmpeg-20fcd0797e15e1acd9e75da55e748e44dd6497f7.tar.gz | |
Implement isnan() function evaluation.
Originally committed as revision 25666 to svn://svn.ffmpeg.org/ffmpeg/trunk
| -rw-r--r-- | doc/eval.texi | 3 | ||||
| -rw-r--r-- | libavutil/avutil.h | 2 | ||||
| -rw-r--r-- | libavutil/eval.c | 9 |
3 files changed, 11 insertions, 3 deletions
diff --git a/doc/eval.texi b/doc/eval.texi index c26893d1bd..99cd034cdf 100644 --- a/doc/eval.texi +++ b/doc/eval.texi @@ -34,6 +34,9 @@ The following functions are available: @item abs(x) @item squish(x) @item gauss(x) +@item isnan(x) +Return 1.0 if @var{x} is NAN, 0.0 otherwise. + @item mod(x, y) @item max(x, y) @item min(x, y) diff --git a/libavutil/avutil.h b/libavutil/avutil.h index eeb0b9084b..5857a0a8f5 100644 --- a/libavutil/avutil.h +++ b/libavutil/avutil.h @@ -41,7 +41,7 @@ #define LIBAVUTIL_VERSION_MAJOR 50 #define LIBAVUTIL_VERSION_MINOR 32 -#define LIBAVUTIL_VERSION_MICRO 5 +#define LIBAVUTIL_VERSION_MICRO 6 #define LIBAVUTIL_VERSION_INT AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \ LIBAVUTIL_VERSION_MINOR, \ diff --git a/libavutil/eval.c b/libavutil/eval.c index a4ae2695d7..fdddd7720d 100644 --- a/libavutil/eval.c +++ b/libavutil/eval.c @@ -118,7 +118,7 @@ static int strmatch(const char *s, const char *prefix) struct AVExpr { enum { e_value, e_const, e_func0, e_func1, e_func2, - e_squish, e_gauss, e_ld, + e_squish, e_gauss, e_ld, e_isnan, e_mod, e_max, e_min, e_eq, e_gt, e_gte, e_pow, e_mul, e_div, e_add, e_last, e_st, e_while, @@ -144,6 +144,7 @@ static double eval_expr(Parser *p, AVExpr *e) case e_squish: return 1/(1+exp(4*eval_expr(p, e->param[0]))); case e_gauss: { double d = eval_expr(p, e->param[0]); return exp(-d*d/2)/sqrt(2*M_PI); } case e_ld: return e->value * p->var[av_clip(eval_expr(p, e->param[0]), 0, VARS-1)]; + case e_isnan: return e->value * !!isnan(eval_expr(p, e->param[0])); case e_while: { double d = NAN; while (eval_expr(p, e->param[0])) @@ -272,6 +273,7 @@ static int parse_primary(AVExpr **e, Parser *p) else if (strmatch(next, "lte" )) { AVExpr *tmp = d->param[1]; d->param[1] = d->param[0]; d->param[0] = tmp; d->type = e_gt; } else if (strmatch(next, "lt" )) { AVExpr *tmp = d->param[1]; d->param[1] = d->param[0]; d->param[0] = tmp; d->type = e_gte; } else if (strmatch(next, "ld" )) d->type = e_ld; + else if (strmatch(next, "isnan" )) d->type = e_isnan; else if (strmatch(next, "st" )) d->type = e_st; else if (strmatch(next, "while" )) d->type = e_while; else { @@ -436,7 +438,8 @@ static int verify_expr(AVExpr *e) case e_func1: case e_squish: case e_ld: - case e_gauss: return verify_expr(e->param[0]); + case e_gauss: + case e_isnan: return verify_expr(e->param[0]); default: return verify_expr(e->param[0]) && verify_expr(e->param[1]); } } @@ -574,6 +577,8 @@ int main(void) "st(1, 1); st(2, 2); st(0, 1); while(lte(ld(0),10), st(3, ld(1)+ld(2)); st(1, ld(2)); st(2, ld(3)); st(0, ld(0)+1)); ld(3)", "while(0, 10)", "st(0, 1); while(lte(ld(0),100), st(1, ld(1)+ld(0)); st(0, ld(0)+1))", + "isnan(1)", + "isnan(NAN)", NULL }; |