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-rw-r--r--libavutil/eval.c157
1 files changed, 144 insertions, 13 deletions
diff --git a/libavutil/eval.c b/libavutil/eval.c
index 7887cf6b0e..4a27742729 100644
--- a/libavutil/eval.c
+++ b/libavutil/eval.c
@@ -2,20 +2,20 @@
* Copyright (c) 2002-2006 Michael Niedermayer <michaelni@gmx.at>
* Copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org>
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
- * Libav is distributed in the hope that it will be useful,
+ * FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
@@ -26,6 +26,7 @@
* see http://joe.hotchkiss.com/programming/eval/eval.html
*/
+#include <float.h>
#include "avutil.h"
#include "common.h"
#include "eval.h"
@@ -46,7 +47,7 @@ typedef struct Parser {
int log_offset;
void *log_ctx;
#define VARS 10
- double var[VARS];
+ double *var;
} Parser;
static const AVClass class = { "Eval", av_default_item_name, NULL, LIBAVUTIL_VERSION_INT, offsetof(Parser,log_offset), offsetof(Parser,log_ctx) };
@@ -74,11 +75,23 @@ static const int8_t si_prefixes['z' - 'E' + 1] = {
['Y'-'E']= 24,
};
+static const struct {
+ const char *name;
+ double value;
+} constants[] = {
+ { "E", M_E },
+ { "PI", M_PI },
+ { "PHI", M_PHI },
+};
+
double av_strtod(const char *numstr, char **tail)
{
double d;
char *next;
- d = strtod(numstr, &next);
+ if(numstr[0]=='0' && (numstr[1]|0x20)=='x') {
+ d = strtoul(numstr, &next, 16);
+ } else
+ d = strtod(numstr, &next);
/* if parsing succeeded, check for and interpret postfixes */
if (next!=numstr) {
if (*next >= 'E' && *next <= 'z') {
@@ -124,8 +137,9 @@ struct AVExpr {
e_squish, e_gauss, e_ld, e_isnan, e_isinf,
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, e_floor, e_ceil, e_trunc,
- e_sqrt, e_not,
+ 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,
} type;
double value; // is sign in other types
union {
@@ -134,7 +148,8 @@ struct AVExpr {
double (*func1)(void *, double);
double (*func2)(void *, double, double);
} a;
- struct AVExpr *param[2];
+ struct AVExpr *param[3];
+ double *var;
};
static double eval_expr(Parser *p, AVExpr *e)
@@ -154,18 +169,88 @@ 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_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_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]) : 0);
+ case e_ifnot: return e->value * (!eval_expr(p, e->param[0]) ? eval_expr(p, e->param[1]) : 0);
+ case e_random:{
+ int idx= av_clip(eval_expr(p, e->param[0]), 0, VARS-1);
+ uint64_t r= isnan(p->var[idx]) ? 0 : p->var[idx];
+ r= r*1664525+1013904223;
+ p->var[idx]= r;
+ return e->value * (r * (1.0/UINT64_MAX));
+ }
case e_while: {
double d = NAN;
while (eval_expr(p, e->param[0]))
d=eval_expr(p, e->param[1]);
return d;
}
+ case e_taylor: {
+ double t = 1, d = 0, v;
+ double x = eval_expr(p, e->param[1]);
+ int id = e->param[2] ? av_clip(eval_expr(p, e->param[2]), 0, VARS-1) : 0;
+ int i;
+ double var0 = p->var[id];
+ for(i=0; i<1000; i++) {
+ double ld = d;
+ p->var[id] = i;
+ v = eval_expr(p, e->param[0]);
+ d += t*v;
+ if(ld==d && v)
+ break;
+ t *= x / (i+1);
+ }
+ p->var[id] = var0;
+ return d;
+ }
+ case e_root: {
+ int i, j;
+ double low = -1, high = -1, v, low_v = -DBL_MAX, high_v = DBL_MAX;
+ double var0 = p->var[0];
+ double x_max = eval_expr(p, e->param[1]);
+ for(i=-1; i<1024; i++) {
+ if(i<255) {
+ p->var[0] = av_reverse[i&255]*x_max/255;
+ } else {
+ p->var[0] = x_max*pow(0.9, i-255);
+ if (i&1) p->var[0] *= -1;
+ if (i&2) p->var[0] += low;
+ else p->var[0] += high;
+ }
+ v = eval_expr(p, e->param[0]);
+ if (v<=0 && v>low_v) {
+ low = p->var[0];
+ low_v = v;
+ }
+ if (v>=0 && v<high_v) {
+ high = p->var[0];
+ high_v = v;
+ }
+ if (low>=0 && high>=0){
+ for (j=0; j<1000; j++) {
+ p->var[0] = (low+high)*0.5;
+ if (low == p->var[0] || high == p->var[0])
+ break;
+ v = eval_expr(p, e->param[0]);
+ if (v<=0) low = p->var[0];
+ if (v>=0) high= p->var[0];
+ if (isnan(v)) {
+ low = high = v;
+ break;
+ }
+ }
+ break;
+ }
+ }
+ p->var[0] = var0;
+ return -low_v<high_v ? low : high;
+ }
default: {
double d = eval_expr(p, e->param[0]);
double d2 = eval_expr(p, e->param[1]);
switch (e->type) {
case e_mod: return e->value * (d - floor(d/d2)*d2);
+ case e_gcd: return e->value * av_gcd(d,d2);
case e_max: return e->value * (d > d2 ? d : d2);
case e_min: return e->value * (d < d2 ? d : d2);
case e_eq: return e->value * (d == d2 ? 1.0 : 0.0);
@@ -173,10 +258,11 @@ static double eval_expr(Parser *p, AVExpr *e)
case e_gte: return e->value * (d >= d2 ? 1.0 : 0.0);
case e_pow: return e->value * pow(d, d2);
case e_mul: return e->value * (d * d2);
- case e_div: return e->value * (d / d2);
+ case e_div: return e->value * ((!CONFIG_FTRAPV || d2 ) ? (d / d2) : d * INFINITY);
case e_add: return e->value * (d + d2);
case e_last:return e->value * d2;
case e_st : return e->value * (p->var[av_clip(d, 0, VARS-1)]= d2);
+ case e_hypot:return e->value * (sqrt(d*d + d2*d2));
}
}
}
@@ -190,6 +276,8 @@ void av_expr_free(AVExpr *e)
if (!e) return;
av_expr_free(e->param[0]);
av_expr_free(e->param[1]);
+ av_expr_free(e->param[2]);
+ av_freep(&e->var);
av_freep(&e);
}
@@ -222,6 +310,15 @@ static int parse_primary(AVExpr **e, Parser *p)
return 0;
}
}
+ for (i = 0; i < FF_ARRAY_ELEMS(constants); i++) {
+ if (strmatch(p->s, constants[i].name)) {
+ p->s += strlen(constants[i].name);
+ d->type = e_value;
+ d->value = constants[i].value;
+ *e = d;
+ return 0;
+ }
+ }
p->s= strchr(p->s, '(');
if (p->s==NULL) {
@@ -252,6 +349,10 @@ static int parse_primary(AVExpr **e, Parser *p)
p->s++; // ","
parse_expr(&d->param[1], p);
}
+ if (p->s[0]== ',') {
+ p->s++; // ","
+ parse_expr(&d->param[2], p);
+ }
if (p->s[0] != ')') {
av_log(p, AV_LOG_ERROR, "Missing ')' or too many args in '%s'\n", s0);
av_expr_free(d);
@@ -287,11 +388,19 @@ static int parse_primary(AVExpr **e, Parser *p)
else if (strmatch(next, "isinf" )) d->type = e_isinf;
else if (strmatch(next, "st" )) d->type = e_st;
else if (strmatch(next, "while" )) d->type = e_while;
+ else if (strmatch(next, "taylor")) d->type = e_taylor;
+ else if (strmatch(next, "root" )) d->type = e_root;
else if (strmatch(next, "floor" )) d->type = e_floor;
else if (strmatch(next, "ceil" )) d->type = e_ceil;
else if (strmatch(next, "trunc" )) d->type = e_trunc;
else if (strmatch(next, "sqrt" )) d->type = e_sqrt;
else if (strmatch(next, "not" )) d->type = e_not;
+ else if (strmatch(next, "pow" )) d->type = e_pow;
+ else if (strmatch(next, "random")) d->type = e_random;
+ else if (strmatch(next, "hypot" )) d->type = e_hypot;
+ else if (strmatch(next, "gcd" )) d->type = e_gcd;
+ else if (strmatch(next, "if" )) d->type = e_if;
+ else if (strmatch(next, "ifnot" )) d->type = e_ifnot;
else {
for (i=0; p->func1_names && p->func1_names[i]; i++) {
if (strmatch(next, p->func1_names[i])) {
@@ -462,8 +571,12 @@ static int verify_expr(AVExpr *e)
case e_trunc:
case e_sqrt:
case e_not:
- return verify_expr(e->param[0]);
- default: return verify_expr(e->param[0]) && verify_expr(e->param[1]);
+ case e_random:
+ return verify_expr(e->param[0]) && !e->param[1];
+ case e_taylor:
+ return verify_expr(e->param[0]) && verify_expr(e->param[1])
+ && (!e->param[2] || verify_expr(e->param[2]));
+ default: return verify_expr(e->param[0]) && verify_expr(e->param[1]) && !e->param[2];
}
}
@@ -511,6 +624,7 @@ int av_expr_parse(AVExpr **expr, const char *s,
ret = AVERROR(EINVAL);
goto end;
}
+ e->var= av_mallocz(sizeof(double) *VARS);
*expr = e;
end:
av_free(w);
@@ -520,6 +634,7 @@ end:
double av_expr_eval(AVExpr *e, const double *const_values, void *opaque)
{
Parser p = { 0 };
+ p.var= e->var;
p.const_values = const_values;
p.opaque = opaque;
@@ -629,6 +744,22 @@ int main(int argc, char **argv)
"not(1)",
"not(NAN)",
"not(0)",
+ "pow(0,1.23)",
+ "pow(PI,1.23)",
+ "PI^1.23",
+ "pow(-1,1.23)",
+ "if(1, 2)",
+ "ifnot(0, 23)",
+ "ifnot(1, NaN) + if(0, 1)",
+ "taylor(1, 1)",
+ "taylor(eq(mod(ld(1),4),1)-eq(mod(ld(1),4),3), PI/2, 1)",
+ "root(sin(ld(0))-1, 2)",
+ "root(sin(ld(0))+6+sin(ld(0)/12)-log(ld(0)), 100)",
+ "7000000B*random(0)",
+ "squish(2)",
+ "gauss(0.1)",
+ "hypot(4,3)",
+ "gcd(30,55)*min(9,1)",
NULL
};
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-10 06:47:12 +0000