FFmpeg: libavutil/eval.c Source File

00001 /*
00002  * Copyright (c) 2002-2006 Michael Niedermayer <michaelni@gmx.at>
00003  * Copyright (c) 2006 Oded Shimon <ods15@ods15.dyndns.org>
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00029 #include "avutil.h"
00030 #include "eval.h"
00031 #include "log.h"
00032 
00033 typedef struct Parser {
00034     const AVClass *class;
00035     int stack_index;
00036     char *s;
00037     const double *const_values;
00038     const char * const *const_names;          // NULL terminated
00039     double (* const *funcs1)(void *, double a);           // NULL terminated
00040     const char * const *func1_names;          // NULL terminated
00041     double (* const *funcs2)(void *, double a, double b); // NULL terminated
00042     const char * const *func2_names;          // NULL terminated
00043     void *opaque;
00044     int log_offset;
00045     void *log_ctx;
00046 #define VARS 10
00047     double *var;
00048 } Parser;
00049 
00050 static const AVClass class = { "Eval", av_default_item_name, NULL, LIBAVUTIL_VERSION_INT, offsetof(Parser,log_offset), offsetof(Parser,log_ctx) };
00051 
00052 static const int8_t si_prefixes['z' - 'E' + 1] = {
00053     ['y'-'E']= -24,
00054     ['z'-'E']= -21,
00055     ['a'-'E']= -18,
00056     ['f'-'E']= -15,
00057     ['p'-'E']= -12,
00058     ['n'-'E']= - 9,
00059     ['u'-'E']= - 6,
00060     ['m'-'E']= - 3,
00061     ['c'-'E']= - 2,
00062     ['d'-'E']= - 1,
00063     ['h'-'E']=   2,
00064     ['k'-'E']=   3,
00065     ['K'-'E']=   3,
00066     ['M'-'E']=   6,
00067     ['G'-'E']=   9,
00068     ['T'-'E']=  12,
00069     ['P'-'E']=  15,
00070     ['E'-'E']=  18,
00071     ['Z'-'E']=  21,
00072     ['Y'-'E']=  24,
00073 };
00074 
00075 static const struct {
00076     const char *name;
00077     double value;
00078 } constants[] = {
00079     { "E",   M_E   },
00080     { "PI",  M_PI  },
00081     { "PHI", M_PHI },
00082 };
00083 
00084 double av_strtod(const char *numstr, char **tail)
00085 {
00086     double d;
00087     char *next;
00088     if(numstr[0]=='0' && (numstr[1]|0x20)=='x') {
00089         d = strtoul(numstr, &next, 16);
00090     } else
00091         d = strtod(numstr, &next);
00092     /* if parsing succeeded, check for and interpret postfixes */
00093     if (next!=numstr) {
00094         if (*next >= 'E' && *next <= 'z') {
00095             int e= si_prefixes[*next - 'E'];
00096             if (e) {
00097                 if (next[1] == 'i') {
00098                     d*= pow( 2, e/0.3);
00099                     next+=2;
00100                 } else {
00101                     d*= pow(10, e);
00102                     next++;
00103                 }
00104             }
00105         }
00106 
00107         if (*next=='B') {
00108             d*=8;
00109             next++;
00110         }
00111     }
00112     /* if requested, fill in tail with the position after the last parsed
00113        character */
00114     if (tail)
00115         *tail = next;
00116     return d;
00117 }
00118 
00119 #define IS_IDENTIFIER_CHAR(c) ((c) - '0' <= 9U || (c) - 'a' <= 25U || (c) - 'A' <= 25U || (c) == '_')
00120 
00121 static int strmatch(const char *s, const char *prefix)
00122 {
00123     int i;
00124     for (i=0; prefix[i]; i++) {
00125         if (prefix[i] != s[i]) return 0;
00126     }
00127     /* return 1 only if the s identifier is terminated */
00128     return !IS_IDENTIFIER_CHAR(s[i]);
00129 }
00130 
00131 struct AVExpr {
00132     enum {
00133         e_value, e_const, e_func0, e_func1, e_func2,
00134         e_squish, e_gauss, e_ld, e_isnan,
00135         e_mod, e_max, e_min, e_eq, e_gt, e_gte,
00136         e_pow, e_mul, e_div, e_add,
00137         e_last, e_st, e_while, e_floor, e_ceil, e_trunc,
00138         e_sqrt, e_not, e_random, e_hypot, e_gcd,
00139         e_if, e_ifnot,
00140     } type;
00141     double value; // is sign in other types
00142     union {
00143         int const_index;
00144         double (*func0)(double);
00145         double (*func1)(void *, double);
00146         double (*func2)(void *, double, double);
00147     } a;
00148     struct AVExpr *param[2];
00149     double *var;
00150 };
00151 
00152 static double eval_expr(Parser *p, AVExpr *e)
00153 {
00154     switch (e->type) {
00155         case e_value:  return e->value;
00156         case e_const:  return e->value * p->const_values[e->a.const_index];
00157         case e_func0:  return e->value * e->a.func0(eval_expr(p, e->param[0]));
00158         case e_func1:  return e->value * e->a.func1(p->opaque, eval_expr(p, e->param[0]));
00159         case e_func2:  return e->value * e->a.func2(p->opaque, eval_expr(p, e->param[0]), eval_expr(p, e->param[1]));
00160         case e_squish: return 1/(1+exp(4*eval_expr(p, e->param[0])));
00161         case e_gauss: { double d = eval_expr(p, e->param[0]); return exp(-d*d/2)/sqrt(2*M_PI); }
00162         case e_ld:     return e->value * p->var[av_clip(eval_expr(p, e->param[0]), 0, VARS-1)];
00163         case e_isnan:  return e->value * !!isnan(eval_expr(p, e->param[0]));
00164         case e_floor:  return e->value * floor(eval_expr(p, e->param[0]));
00165         case e_ceil :  return e->value * ceil (eval_expr(p, e->param[0]));
00166         case e_trunc:  return e->value * trunc(eval_expr(p, e->param[0]));
00167         case e_sqrt:   return e->value * sqrt (eval_expr(p, e->param[0]));
00168         case e_not:    return e->value * (eval_expr(p, e->param[0]) == 0);
00169         case e_if:     return e->value * ( eval_expr(p, e->param[0]) ? eval_expr(p, e->param[1]) : 0);
00170         case e_ifnot:  return e->value * (!eval_expr(p, e->param[0]) ? eval_expr(p, e->param[1]) : 0);
00171         case e_random:{
00172             int idx= av_clip(eval_expr(p, e->param[0]), 0, VARS-1);
00173             uint64_t r= isnan(p->var[idx]) ? 0 : p->var[idx];
00174             r= r*1664525+1013904223;
00175             p->var[idx]= r;
00176             return e->value * (r * (1.0/UINT64_MAX));
00177         }
00178         case e_while: {
00179             double d = NAN;
00180             while (eval_expr(p, e->param[0]))
00181                 d=eval_expr(p, e->param[1]);
00182             return d;
00183         }
00184         default: {
00185             double d = eval_expr(p, e->param[0]);
00186             double d2 = eval_expr(p, e->param[1]);
00187             switch (e->type) {
00188                 case e_mod: return e->value * (d - floor(d/d2)*d2);
00189                 case e_gcd: return e->value * av_gcd(d,d2);
00190                 case e_max: return e->value * (d >  d2 ?   d : d2);
00191                 case e_min: return e->value * (d <  d2 ?   d : d2);
00192                 case e_eq:  return e->value * (d == d2 ? 1.0 : 0.0);
00193                 case e_gt:  return e->value * (d >  d2 ? 1.0 : 0.0);
00194                 case e_gte: return e->value * (d >= d2 ? 1.0 : 0.0);
00195                 case e_pow: return e->value * pow(d, d2);
00196                 case e_mul: return e->value * (d * d2);
00197                 case e_div: return e->value * (d / d2);
00198                 case e_add: return e->value * (d + d2);
00199                 case e_last:return e->value * d2;
00200                 case e_st : return e->value * (p->var[av_clip(d, 0, VARS-1)]= d2);
00201                 case e_hypot:return e->value * (sqrt(d*d + d2*d2));
00202             }
00203         }
00204     }
00205     return NAN;
00206 }
00207 
00208 static int parse_expr(AVExpr **e, Parser *p);
00209 
00210 void av_expr_free(AVExpr *e)
00211 {
00212     if (!e) return;
00213     av_expr_free(e->param[0]);
00214     av_expr_free(e->param[1]);
00215     av_freep(&e->var);
00216     av_freep(&e);
00217 }
00218 
00219 static int parse_primary(AVExpr **e, Parser *p)
00220 {
00221     AVExpr *d = av_mallocz(sizeof(AVExpr));
00222     char *next = p->s, *s0 = p->s;
00223     int ret, i;
00224 
00225     if (!d)
00226         return AVERROR(ENOMEM);
00227 
00228     /* number */
00229     d->value = av_strtod(p->s, &next);
00230     if (next != p->s) {
00231         d->type = e_value;
00232         p->s= next;
00233         *e = d;
00234         return 0;
00235     }
00236     d->value = 1;
00237 
00238     /* named constants */
00239     for (i=0; p->const_names && p->const_names[i]; i++) {
00240         if (strmatch(p->s, p->const_names[i])) {
00241             p->s+= strlen(p->const_names[i]);
00242             d->type = e_const;
00243             d->a.const_index = i;
00244             *e = d;
00245             return 0;
00246         }
00247     }
00248     for (i = 0; i < FF_ARRAY_ELEMS(constants); i++) {
00249         if (strmatch(p->s, constants[i].name)) {
00250             p->s += strlen(constants[i].name);
00251             d->type = e_value;
00252             d->value = constants[i].value;
00253             *e = d;
00254             return 0;
00255         }
00256     }
00257 
00258     p->s= strchr(p->s, '(');
00259     if (p->s==NULL) {
00260         av_log(p, AV_LOG_ERROR, "Undefined constant or missing '(' in '%s'\n", s0);
00261         p->s= next;
00262         av_expr_free(d);
00263         return AVERROR(EINVAL);
00264     }
00265     p->s++; // "("
00266     if (*next == '(') { // special case do-nothing
00267         av_freep(&d);
00268         if ((ret = parse_expr(&d, p)) < 0)
00269             return ret;
00270         if (p->s[0] != ')') {
00271             av_log(p, AV_LOG_ERROR, "Missing ')' in '%s'\n", s0);
00272             av_expr_free(d);
00273             return AVERROR(EINVAL);
00274         }
00275         p->s++; // ")"
00276         *e = d;
00277         return 0;
00278     }
00279     if ((ret = parse_expr(&(d->param[0]), p)) < 0) {
00280         av_expr_free(d);
00281         return ret;
00282     }
00283     if (p->s[0]== ',') {
00284         p->s++; // ","
00285         parse_expr(&d->param[1], p);
00286     }
00287     if (p->s[0] != ')') {
00288         av_log(p, AV_LOG_ERROR, "Missing ')' or too many args in '%s'\n", s0);
00289         av_expr_free(d);
00290         return AVERROR(EINVAL);
00291     }
00292     p->s++; // ")"
00293 
00294     d->type = e_func0;
00295          if (strmatch(next, "sinh"  )) d->a.func0 = sinh;
00296     else if (strmatch(next, "cosh"  )) d->a.func0 = cosh;
00297     else if (strmatch(next, "tanh"  )) d->a.func0 = tanh;
00298     else if (strmatch(next, "sin"   )) d->a.func0 = sin;
00299     else if (strmatch(next, "cos"   )) d->a.func0 = cos;
00300     else if (strmatch(next, "tan"   )) d->a.func0 = tan;
00301     else if (strmatch(next, "atan"  )) d->a.func0 = atan;
00302     else if (strmatch(next, "asin"  )) d->a.func0 = asin;
00303     else if (strmatch(next, "acos"  )) d->a.func0 = acos;
00304     else if (strmatch(next, "exp"   )) d->a.func0 = exp;
00305     else if (strmatch(next, "log"   )) d->a.func0 = log;
00306     else if (strmatch(next, "abs"   )) d->a.func0 = fabs;
00307     else if (strmatch(next, "squish")) d->type = e_squish;
00308     else if (strmatch(next, "gauss" )) d->type = e_gauss;
00309     else if (strmatch(next, "mod"   )) d->type = e_mod;
00310     else if (strmatch(next, "max"   )) d->type = e_max;
00311     else if (strmatch(next, "min"   )) d->type = e_min;
00312     else if (strmatch(next, "eq"    )) d->type = e_eq;
00313     else if (strmatch(next, "gte"   )) d->type = e_gte;
00314     else if (strmatch(next, "gt"    )) d->type = e_gt;
00315     else if (strmatch(next, "lte"   )) { AVExpr *tmp = d->param[1]; d->param[1] = d->param[0]; d->param[0] = tmp; d->type = e_gte; }
00316     else if (strmatch(next, "lt"    )) { AVExpr *tmp = d->param[1]; d->param[1] = d->param[0]; d->param[0] = tmp; d->type = e_gt; }
00317     else if (strmatch(next, "ld"    )) d->type = e_ld;
00318     else if (strmatch(next, "isnan" )) d->type = e_isnan;
00319     else if (strmatch(next, "st"    )) d->type = e_st;
00320     else if (strmatch(next, "while" )) d->type = e_while;
00321     else if (strmatch(next, "floor" )) d->type = e_floor;
00322     else if (strmatch(next, "ceil"  )) d->type = e_ceil;
00323     else if (strmatch(next, "trunc" )) d->type = e_trunc;
00324     else if (strmatch(next, "sqrt"  )) d->type = e_sqrt;
00325     else if (strmatch(next, "not"   )) d->type = e_not;
00326     else if (strmatch(next, "pow"   )) d->type = e_pow;
00327     else if (strmatch(next, "random")) d->type = e_random;
00328     else if (strmatch(next, "hypot" )) d->type = e_hypot;
00329     else if (strmatch(next, "gcd"   )) d->type = e_gcd;
00330     else if (strmatch(next, "if"    )) d->type = e_if;
00331     else if (strmatch(next, "ifnot" )) d->type = e_ifnot;
00332     else {
00333         for (i=0; p->func1_names && p->func1_names[i]; i++) {
00334             if (strmatch(next, p->func1_names[i])) {
00335                 d->a.func1 = p->funcs1[i];
00336                 d->type = e_func1;
00337                 *e = d;
00338                 return 0;
00339             }
00340         }
00341 
00342         for (i=0; p->func2_names && p->func2_names[i]; i++) {
00343             if (strmatch(next, p->func2_names[i])) {
00344                 d->a.func2 = p->funcs2[i];
00345                 d->type = e_func2;
00346                 *e = d;
00347                 return 0;
00348             }
00349         }
00350 
00351         av_log(p, AV_LOG_ERROR, "Unknown function in '%s'\n", s0);
00352         av_expr_free(d);
00353         return AVERROR(EINVAL);
00354     }
00355 
00356     *e = d;
00357     return 0;
00358 }
00359 
00360 static AVExpr *new_eval_expr(int type, int value, AVExpr *p0, AVExpr *p1)
00361 {
00362     AVExpr *e = av_mallocz(sizeof(AVExpr));
00363     if (!e)
00364         return NULL;
00365     e->type     =type   ;
00366     e->value    =value  ;
00367     e->param[0] =p0     ;
00368     e->param[1] =p1     ;
00369     return e;
00370 }
00371 
00372 static int parse_pow(AVExpr **e, Parser *p, int *sign)
00373 {
00374     *sign= (*p->s == '+') - (*p->s == '-');
00375     p->s += *sign&1;
00376     return parse_primary(e, p);
00377 }
00378 
00379 static int parse_factor(AVExpr **e, Parser *p)
00380 {
00381     int sign, sign2, ret;
00382     AVExpr *e0, *e1, *e2;
00383     if ((ret = parse_pow(&e0, p, &sign)) < 0)
00384         return ret;
00385     while(p->s[0]=='^'){
00386         e1 = e0;
00387         p->s++;
00388         if ((ret = parse_pow(&e2, p, &sign2)) < 0) {
00389             av_expr_free(e1);
00390             return ret;
00391         }
00392         e0 = new_eval_expr(e_pow, 1, e1, e2);
00393         if (!e0) {
00394             av_expr_free(e1);
00395             av_expr_free(e2);
00396             return AVERROR(ENOMEM);
00397         }
00398         if (e0->param[1]) e0->param[1]->value *= (sign2|1);
00399     }
00400     if (e0) e0->value *= (sign|1);
00401 
00402     *e = e0;
00403     return 0;
00404 }
00405 
00406 static int parse_term(AVExpr **e, Parser *p)
00407 {
00408     int ret;
00409     AVExpr *e0, *e1, *e2;
00410     if ((ret = parse_factor(&e0, p)) < 0)
00411         return ret;
00412     while (p->s[0]=='*' || p->s[0]=='/') {
00413         int c= *p->s++;
00414         e1 = e0;
00415         if ((ret = parse_factor(&e2, p)) < 0) {
00416             av_expr_free(e1);
00417             return ret;
00418         }
00419         e0 = new_eval_expr(c == '*' ? e_mul : e_div, 1, e1, e2);
00420         if (!e0) {
00421             av_expr_free(e1);
00422             av_expr_free(e2);
00423             return AVERROR(ENOMEM);
00424         }
00425     }
00426     *e = e0;
00427     return 0;
00428 }
00429 
00430 static int parse_subexpr(AVExpr **e, Parser *p)
00431 {
00432     int ret;
00433     AVExpr *e0, *e1, *e2;
00434     if ((ret = parse_term(&e0, p)) < 0)
00435         return ret;
00436     while (*p->s == '+' || *p->s == '-') {
00437         e1 = e0;
00438         if ((ret = parse_term(&e2, p)) < 0) {
00439             av_expr_free(e1);
00440             return ret;
00441         }
00442         e0 = new_eval_expr(e_add, 1, e1, e2);
00443         if (!e0) {
00444             av_expr_free(e1);
00445             av_expr_free(e2);
00446             return AVERROR(ENOMEM);
00447         }
00448     };
00449 
00450     *e = e0;
00451     return 0;
00452 }
00453 
00454 static int parse_expr(AVExpr **e, Parser *p)
00455 {
00456     int ret;
00457     AVExpr *e0, *e1, *e2;
00458     if (p->stack_index <= 0) //protect against stack overflows
00459         return AVERROR(EINVAL);
00460     p->stack_index--;
00461 
00462     if ((ret = parse_subexpr(&e0, p)) < 0)
00463         return ret;
00464     while (*p->s == ';') {
00465         p->s++;
00466         e1 = e0;
00467         if ((ret = parse_subexpr(&e2, p)) < 0) {
00468             av_expr_free(e1);
00469             return ret;
00470         }
00471         e0 = new_eval_expr(e_last, 1, e1, e2);
00472         if (!e0) {
00473             av_expr_free(e1);
00474             av_expr_free(e2);
00475             return AVERROR(ENOMEM);
00476         }
00477     };
00478 
00479     p->stack_index++;
00480     *e = e0;
00481     return 0;
00482 }
00483 
00484 static int verify_expr(AVExpr *e)
00485 {
00486     if (!e) return 0;
00487     switch (e->type) {
00488         case e_value:
00489         case e_const: return 1;
00490         case e_func0:
00491         case e_func1:
00492         case e_squish:
00493         case e_ld:
00494         case e_gauss:
00495         case e_isnan:
00496         case e_floor:
00497         case e_ceil:
00498         case e_trunc:
00499         case e_sqrt:
00500         case e_not:
00501         case e_random:
00502             return verify_expr(e->param[0]);
00503         default: return verify_expr(e->param[0]) && verify_expr(e->param[1]);
00504     }
00505 }
00506 
00507 int av_expr_parse(AVExpr **expr, const char *s,
00508                   const char * const *const_names,
00509                   const char * const *func1_names, double (* const *funcs1)(void *, double),
00510                   const char * const *func2_names, double (* const *funcs2)(void *, double, double),
00511                   int log_offset, void *log_ctx)
00512 {
00513     Parser p = { 0 };
00514     AVExpr *e = NULL;
00515     char *w = av_malloc(strlen(s) + 1);
00516     char *wp = w;
00517     const char *s0 = s;
00518     int ret = 0;
00519 
00520     if (!w)
00521         return AVERROR(ENOMEM);
00522 
00523     while (*s)
00524         if (!isspace(*s++)) *wp++ = s[-1];
00525     *wp++ = 0;
00526 
00527     p.class      = &class;
00528     p.stack_index=100;
00529     p.s= w;
00530     p.const_names = const_names;
00531     p.funcs1      = funcs1;
00532     p.func1_names = func1_names;
00533     p.funcs2      = funcs2;
00534     p.func2_names = func2_names;
00535     p.log_offset = log_offset;
00536     p.log_ctx    = log_ctx;
00537 
00538     if ((ret = parse_expr(&e, &p)) < 0)
00539         goto end;
00540     if (*p.s) {
00541         av_expr_free(e);
00542         av_log(&p, AV_LOG_ERROR, "Invalid chars '%s' at the end of expression '%s'\n", p.s, s0);
00543         ret = AVERROR(EINVAL);
00544         goto end;
00545     }
00546     if (!verify_expr(e)) {
00547         av_expr_free(e);
00548         ret = AVERROR(EINVAL);
00549         goto end;
00550     }
00551     e->var= av_mallocz(sizeof(double) *VARS);
00552     *expr = e;
00553 end:
00554     av_free(w);
00555     return ret;
00556 }
00557 
00558 double av_expr_eval(AVExpr *e, const double *const_values, void *opaque)
00559 {
00560     Parser p = { 0 };
00561     p.var= e->var;
00562 
00563     p.const_values = const_values;
00564     p.opaque     = opaque;
00565     return eval_expr(&p, e);
00566 }
00567 
00568 int av_expr_parse_and_eval(double *d, const char *s,
00569                            const char * const *const_names, const double *const_values,
00570                            const char * const *func1_names, double (* const *funcs1)(void *, double),
00571                            const char * const *func2_names, double (* const *funcs2)(void *, double, double),
00572                            void *opaque, int log_offset, void *log_ctx)
00573 {
00574     AVExpr *e = NULL;
00575     int ret = av_expr_parse(&e, s, const_names, func1_names, funcs1, func2_names, funcs2, log_offset, log_ctx);
00576 
00577     if (ret < 0) {
00578         *d = NAN;
00579         return ret;
00580     }
00581     *d = av_expr_eval(e, const_values, opaque);
00582     av_expr_free(e);
00583     return isnan(*d) ? AVERROR(EINVAL) : 0;
00584 }
00585 
00586 #if FF_API_OLD_EVAL_NAMES
00587 // LCOV_EXCL_START
00588 int av_parse_expr(AVExpr **expr, const char *s,
00589                   const char * const *const_names,
00590                   const char * const *func1_names, double (* const *funcs1)(void *, double),
00591                   const char * const *func2_names, double (* const *funcs2)(void *, double, double),
00592                   int log_offset, void *log_ctx)
00593 {
00594     return av_expr_parse(expr, s, const_names, func1_names, funcs1, func2_names, funcs2,
00595                       log_offset, log_ctx);
00596 }
00597 
00598 double av_eval_expr(AVExpr *e, const double *const_values, void *opaque)
00599 {
00600     return av_expr_eval(e, const_values, opaque);
00601 }
00602 
00603 int av_parse_and_eval_expr(double *res, const char *s,
00604                            const char * const *const_names, const double *const_values,
00605                            const char * const *func1_names, double (* const *funcs1)(void *, double),
00606                            const char * const *func2_names, double (* const *funcs2)(void *, double, double),
00607                            void *opaque, int log_offset, void *log_ctx)
00608 {
00609     return av_expr_parse_and_eval(res, s, const_names, const_values, func1_names, funcs1, func2_names, funcs2,
00610                                   opaque, log_offset, log_ctx);
00611 }
00612 
00613 void av_free_expr(AVExpr *e)
00614 {
00615     av_expr_free(e);
00616 }
00617 // LCOV_EXCL_STOP
00618 #endif /* FF_API_OLD_EVAL_NAMES */
00619 
00620 #ifdef TEST
00621 // LCOV_EXCL_START
00622 #undef printf
00623 #include <string.h>
00624 
00625 static double const_values[] = {
00626     M_PI,
00627     M_E,
00628     0
00629 };
00630 
00631 static const char *const_names[] = {
00632     "PI",
00633     "E",
00634     0
00635 };
00636 
00637 int main(int argc, char **argv)
00638 {
00639     int i;
00640     double d;
00641     const char **expr, *exprs[] = {
00642         "",
00643         "1;2",
00644         "-20",
00645         "-PI",
00646         "+PI",
00647         "1+(5-2)^(3-1)+1/2+sin(PI)-max(-2.2,-3.1)",
00648         "80G/80Gi",
00649         "1k",
00650         "1Gi",
00651         "1gi",
00652         "1GiFoo",
00653         "1k+1k",
00654         "1Gi*3foo",
00655         "foo",
00656         "foo(",
00657         "foo()",
00658         "foo)",
00659         "sin",
00660         "sin(",
00661         "sin()",
00662         "sin)",
00663         "sin 10",
00664         "sin(1,2,3)",
00665         "sin(1 )",
00666         "1",
00667         "1foo",
00668         "bar + PI + E + 100f*2 + foo",
00669         "13k + 12f - foo(1, 2)",
00670         "1gi",
00671         "1Gi",
00672         "st(0, 123)",
00673         "st(1, 123); ld(1)",
00674         /* compute 1+2+...+N */
00675         "st(0, 1); while(lte(ld(0), 100), st(1, ld(1)+ld(0));st(0, ld(0)+1)); ld(1)",
00676         /* compute Fib(N) */
00677         "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)",
00678         "while(0, 10)",
00679         "st(0, 1); while(lte(ld(0),100), st(1, ld(1)+ld(0)); st(0, ld(0)+1))",
00680         "isnan(1)",
00681         "isnan(NAN)",
00682         "floor(NAN)",
00683         "floor(123.123)",
00684         "floor(-123.123)",
00685         "trunc(123.123)",
00686         "trunc(-123.123)",
00687         "ceil(123.123)",
00688         "ceil(-123.123)",
00689         "sqrt(1764)",
00690         "isnan(sqrt(-1))",
00691         "not(1)",
00692         "not(NAN)",
00693         "not(0)",
00694         "pow(0,1.23)",
00695         "pow(PI,1.23)",
00696         "PI^1.23",
00697         "pow(-1,1.23)",
00698         "if(1, 2)",
00699         "ifnot(0, 23)",
00700         "ifnot(1, NaN) + if(0, 1)",
00701         NULL
00702     };
00703 
00704     for (expr = exprs; *expr; expr++) {
00705         printf("Evaluating '%s'\n", *expr);
00706         av_expr_parse_and_eval(&d, *expr,
00707                                const_names, const_values,
00708                                NULL, NULL, NULL, NULL, NULL, 0, NULL);
00709         if(isnan(d)){
00710             printf("'%s' -> nan\n\n", *expr);
00711         }else{
00712             printf("'%s' -> %f\n\n", *expr, d);
00713         }
00714     }
00715 
00716     av_expr_parse_and_eval(&d, "1+(5-2)^(3-1)+1/2+sin(PI)-max(-2.2,-3.1)",
00717                            const_names, const_values,
00718                            NULL, NULL, NULL, NULL, NULL, 0, NULL);
00719     printf("%f == 12.7\n", d);
00720     av_expr_parse_and_eval(&d, "80G/80Gi",
00721                            const_names, const_values,
00722                            NULL, NULL, NULL, NULL, NULL, 0, NULL);
00723     printf("%f == 0.931322575\n", d);
00724 
00725     if (argc > 1 && !strcmp(argv[1], "-t")) {
00726         for (i = 0; i < 1050; i++) {
00727             START_TIMER;
00728             av_expr_parse_and_eval(&d, "1+(5-2)^(3-1)+1/2+sin(PI)-max(-2.2,-3.1)",
00729                                    const_names, const_values,
00730                                    NULL, NULL, NULL, NULL, NULL, 0, NULL);
00731             STOP_TIMER("av_expr_parse_and_eval");
00732         }
00733     }
00734 
00735     return 0;
00736 }
00737 // LCOV_EXCL_STOP
00738 #endif