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lavu/eval: add between() function.

This commit is contained in:
Clément Bœsch 2013-03-22 01:47:49 +01:00
parent ac9b056ddb
commit 77f60f0011
4 changed files with 28 additions and 2 deletions
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4
doc/eval.texi
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@ -32,6 +32,10 @@ Compute arcsine of @var{x}.
@item atan(x)
Compute arctangent of @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.
@item bitand(x, y)
@item bitor(x, y)
Compute bitwise and/or operation on @var{x} and @var{y}.

15
libavutil/eval.c
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@ -145,7 +145,7 @@ 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_if, e_ifnot, e_print, e_bitand, e_bitor, e_between,
} type;
double value; // is sign in other types
union {
@ -185,6 +185,11 @@ static double eval_expr(Parser *p, AVExpr *e)
e->param[2] ? eval_expr(p, e->param[2]) : 0);
case e_ifnot: return e->value * (!eval_expr(p, e->param[0]) ? eval_expr(p, e->param[1]) :
e->param[2] ? eval_expr(p, e->param[2]) : 0);
case e_between: {
double d = eval_expr(p, e->param[0]);
return e->value * (d >= eval_expr(p, e->param[1]) &&
d <= eval_expr(p, e->param[2]));
}
case e_print: {
double x = eval_expr(p, e->param[0]);
int level = e->param[1] ? av_clip(eval_expr(p, e->param[1]), INT_MIN, INT_MAX) : AV_LOG_INFO;
@ -428,6 +433,7 @@ static int parse_primary(AVExpr **e, Parser *p)
else if (strmatch(next, "ifnot" )) d->type = e_ifnot;
else if (strmatch(next, "bitand")) d->type = e_bitand;
else if (strmatch(next, "bitor" )) d->type = e_bitor;
else if (strmatch(next, "between"))d->type = e_between;
else {
for (i=0; p->func1_names && p->func1_names[i]; i++) {
if (strmatch(next, p->func1_names[i])) {
@ -623,6 +629,10 @@ static int verify_expr(AVExpr *e)
case e_taylor:
return verify_expr(e->param[0]) && verify_expr(e->param[1])
&& (!e->param[2] || verify_expr(e->param[2]));
case e_between:
return verify_expr(e->param[0]) &&
verify_expr(e->param[1]) &&
verify_expr(e->param[2]);
default: return verify_expr(e->param[0]) && verify_expr(e->param[1]) && !e->param[2];
}
}
@ -816,6 +826,9 @@ int main(int argc, char **argv)
"bitor(42, 12)",
"bitand(42, 12)",
"bitand(NAN, 1)",
"between(10, -3, 10)",
"between(-4, -2, -1)",
"between(1,2)",
NULL
};

2
libavutil/version.h
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@ -76,7 +76,7 @@
#define LIBAVUTIL_VERSION_MAJOR 52
#define LIBAVUTIL_VERSION_MINOR 22
#define LIBAVUTIL_VERSION_MICRO 100
#define LIBAVUTIL_VERSION_MICRO 101
#define LIBAVUTIL_VERSION_INT AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
LIBAVUTIL_VERSION_MINOR, \

9
tests/ref/fate/eval
View File

@ -259,5 +259,14 @@ Evaluating 'bitand(42, 12)'
Evaluating 'bitand(NAN, 1)'
'bitand(NAN, 1)' -> nan
Evaluating 'between(10, -3, 10)'
'between(10, -3, 10)' -> 1.000000
Evaluating 'between(-4, -2, -1)'
'between(-4, -2, -1)' -> 0.000000
Evaluating 'between(1,2)'
'between(1,2)' -> nan
12.700000 == 12.7
0.931323 == 0.931322575