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     } type;
00140     double value; // is sign in other types
00141     union {
00142         int const_index;
00143         double (*func0)(double);
00144         double (*func1)(void *, double);
00145         double (*func2)(void *, double, double);
00146     } a;
00147     struct AVExpr *param[2];
00148     double *var;
00149 };
00150 
00151 static double eval_expr(Parser *p, AVExpr *e)
00152 {
00153     switch (e->type) {
00154         case e_value:  return e->value;
00155         case e_const:  return e->value * p->const_values[e->a.const_index];
00156         case e_func0:  return e->value * e->a.func0(eval_expr(p, e->param[0]));
00157         case e_func1:  return e->value * e->a.func1(p->opaque, eval_expr(p, e->param[0]));
00158         case e_func2:  return e->value * e->a.func2(p->opaque, eval_expr(p, e->param[0]), eval_expr(p, e->param[1]));
00159         case e_squish: return 1/(1+exp(4*eval_expr(p, e->param[0])));
00160         case e_gauss: { double d = eval_expr(p, e->param[0]); return exp(-d*d/2)/sqrt(2*M_PI); }
00161         case e_ld:     return e->value * p->var[av_clip(eval_expr(p, e->param[0]), 0, VARS-1)];
00162         case e_isnan:  return e->value * !!isnan(eval_expr(p, e->param[0]));
00163         case e_floor:  return e->value * floor(eval_expr(p, e->param[0]));
00164         case e_ceil :  return e->value * ceil (eval_expr(p, e->param[0]));
00165         case e_trunc:  return e->value * trunc(eval_expr(p, e->param[0]));
00166         case e_sqrt:   return e->value * sqrt (eval_expr(p, e->param[0]));
00167         case e_not:    return e->value * (eval_expr(p, e->param[0]) == 0);
00168         case e_random:{
00169             int idx= av_clip(eval_expr(p, e->param[0]), 0, VARS-1);
00170             uint64_t r= isnan(p->var[idx]) ? 0 : p->var[idx];
00171             r= r*1664525+1013904223;
00172             p->var[idx]= r;
00173             return e->value * (r * (1.0/UINT64_MAX));
00174         }
00175         case e_while: {
00176             double d = NAN;
00177             while (eval_expr(p, e->param[0]))
00178                 d=eval_expr(p, e->param[1]);
00179             return d;
00180         }
00181         default: {
00182             double d = eval_expr(p, e->param[0]);
00183             double d2 = eval_expr(p, e->param[1]);
00184             switch (e->type) {
00185                 case e_mod: return e->value * (d - floor(d/d2)*d2);
00186                 case e_gcd: return e->value * av_gcd(d,d2);
00187                 case e_max: return e->value * (d >  d2 ?   d : d2);
00188                 case e_min: return e->value * (d <  d2 ?   d : d2);
00189                 case e_eq:  return e->value * (d == d2 ? 1.0 : 0.0);
00190                 case e_gt:  return e->value * (d >  d2 ? 1.0 : 0.0);
00191                 case e_gte: return e->value * (d >= d2 ? 1.0 : 0.0);
00192                 case e_pow: return e->value * pow(d, d2);
00193                 case e_mul: return e->value * (d * d2);
00194                 case e_div: return e->value * (d / d2);
00195                 case e_add: return e->value * (d + d2);
00196                 case e_last:return e->value * d2;
00197                 case e_st : return e->value * (p->var[av_clip(d, 0, VARS-1)]= d2);
00198                 case e_hypot:return e->value * (sqrt(d*d + d2*d2));
00199             }
00200         }
00201     }
00202     return NAN;
00203 }
00204 
00205 static int parse_expr(AVExpr **e, Parser *p);
00206 
00207 void av_expr_free(AVExpr *e)
00208 {
00209     if (!e) return;
00210     av_expr_free(e->param[0]);
00211     av_expr_free(e->param[1]);
00212     av_freep(&e->var);
00213     av_freep(&e);
00214 }
00215 
00216 static int parse_primary(AVExpr **e, Parser *p)
00217 {
00218     AVExpr *d = av_mallocz(sizeof(AVExpr));
00219     char *next = p->s, *s0 = p->s;
00220     int ret, i;
00221 
00222     if (!d)
00223         return AVERROR(ENOMEM);
00224 
00225     /* number */
00226     d->value = av_strtod(p->s, &next);
00227     if (next != p->s) {
00228         d->type = e_value;
00229         p->s= next;
00230         *e = d;
00231         return 0;
00232     }
00233     d->value = 1;
00234 
00235     /* named constants */
00236     for (i=0; p->const_names && p->const_names[i]; i++) {
00237         if (strmatch(p->s, p->const_names[i])) {
00238             p->s+= strlen(p->const_names[i]);
00239             d->type = e_const;
00240             d->a.const_index = i;
00241             *e = d;
00242             return 0;
00243         }
00244     }
00245     for (i = 0; i < FF_ARRAY_ELEMS(constants); i++) {
00246         if (strmatch(p->s, constants[i].name)) {
00247             p->s += strlen(constants[i].name);
00248             d->type = e_value;
00249             d->value = constants[i].value;
00250             *e = d;
00251             return 0;
00252         }
00253     }
00254 
00255     p->s= strchr(p->s, '(');
00256     if (p->s==NULL) {
00257         av_log(p, AV_LOG_ERROR, "Undefined constant or missing '(' in '%s'\n", s0);
00258         p->s= next;
00259         av_expr_free(d);
00260         return AVERROR(EINVAL);
00261     }
00262     p->s++; // "("
00263     if (*next == '(') { // special case do-nothing
00264         av_freep(&d);
00265         if ((ret = parse_expr(&d, p)) < 0)
00266             return ret;
00267         if (p->s[0] != ')') {
00268             av_log(p, AV_LOG_ERROR, "Missing ')' in '%s'\n", s0);
00269             av_expr_free(d);
00270             return AVERROR(EINVAL);
00271         }
00272         p->s++; // ")"
00273         *e = d;
00274         return 0;
00275     }
00276     if ((ret = parse_expr(&(d->param[0]), p)) < 0) {
00277         av_expr_free(d);
00278         return ret;
00279     }
00280     if (p->s[0]== ',') {
00281         p->s++; // ","
00282         parse_expr(&d->param[1], p);
00283     }
00284     if (p->s[0] != ')') {
00285         av_log(p, AV_LOG_ERROR, "Missing ')' or too many args in '%s'\n", s0);
00286         av_expr_free(d);
00287         return AVERROR(EINVAL);
00288     }
00289     p->s++; // ")"
00290 
00291     d->type = e_func0;
00292          if (strmatch(next, "sinh"  )) d->a.func0 = sinh;
00293     else if (strmatch(next, "cosh"  )) d->a.func0 = cosh;
00294     else if (strmatch(next, "tanh"  )) d->a.func0 = tanh;
00295     else if (strmatch(next, "sin"   )) d->a.func0 = sin;
00296     else if (strmatch(next, "cos"   )) d->a.func0 = cos;
00297     else if (strmatch(next, "tan"   )) d->a.func0 = tan;
00298     else if (strmatch(next, "atan"  )) d->a.func0 = atan;
00299     else if (strmatch(next, "asin"  )) d->a.func0 = asin;
00300     else if (strmatch(next, "acos"  )) d->a.func0 = acos;
00301     else if (strmatch(next, "exp"   )) d->a.func0 = exp;
00302     else if (strmatch(next, "log"   )) d->a.func0 = log;
00303     else if (strmatch(next, "abs"   )) d->a.func0 = fabs;
00304     else if (strmatch(next, "squish")) d->type = e_squish;
00305     else if (strmatch(next, "gauss" )) d->type = e_gauss;
00306     else if (strmatch(next, "mod"   )) d->type = e_mod;
00307     else if (strmatch(next, "max"   )) d->type = e_max;
00308     else if (strmatch(next, "min"   )) d->type = e_min;
00309     else if (strmatch(next, "eq"    )) d->type = e_eq;
00310     else if (strmatch(next, "gte"   )) d->type = e_gte;
00311     else if (strmatch(next, "gt"    )) d->type = e_gt;
00312     else if (strmatch(next, "lte"   )) { AVExpr *tmp = d->param[1]; d->param[1] = d->param[0]; d->param[0] = tmp; d->type = e_gt; }
00313     else if (strmatch(next, "lt"    )) { AVExpr *tmp = d->param[1]; d->param[1] = d->param[0]; d->param[0] = tmp; d->type = e_gte; }
00314     else if (strmatch(next, "ld"    )) d->type = e_ld;
00315     else if (strmatch(next, "isnan" )) d->type = e_isnan;
00316     else if (strmatch(next, "st"    )) d->type = e_st;
00317     else if (strmatch(next, "while" )) d->type = e_while;
00318     else if (strmatch(next, "floor" )) d->type = e_floor;
00319     else if (strmatch(next, "ceil"  )) d->type = e_ceil;
00320     else if (strmatch(next, "trunc" )) d->type = e_trunc;
00321     else if (strmatch(next, "sqrt"  )) d->type = e_sqrt;
00322     else if (strmatch(next, "not"   )) d->type = e_not;
00323     else if (strmatch(next, "pow"   )) d->type = e_pow;
00324     else if (strmatch(next, "random")) d->type = e_random;
00325     else if (strmatch(next, "hypot" )) d->type = e_hypot;
00326     else if (strmatch(next, "gcd"   )) d->type = e_gcd;
00327     else {
00328         for (i=0; p->func1_names && p->func1_names[i]; i++) {
00329             if (strmatch(next, p->func1_names[i])) {
00330                 d->a.func1 = p->funcs1[i];
00331                 d->type = e_func1;
00332                 *e = d;
00333                 return 0;
00334             }
00335         }
00336 
00337         for (i=0; p->func2_names && p->func2_names[i]; i++) {
00338             if (strmatch(next, p->func2_names[i])) {
00339                 d->a.func2 = p->funcs2[i];
00340                 d->type = e_func2;
00341                 *e = d;
00342                 return 0;
00343             }
00344         }
00345 
00346         av_log(p, AV_LOG_ERROR, "Unknown function in '%s'\n", s0);
00347         av_expr_free(d);
00348         return AVERROR(EINVAL);
00349     }
00350 
00351     *e = d;
00352     return 0;
00353 }
00354 
00355 static AVExpr *new_eval_expr(int type, int value, AVExpr *p0, AVExpr *p1)
00356 {
00357     AVExpr *e = av_mallocz(sizeof(AVExpr));
00358     if (!e)
00359         return NULL;
00360     e->type     =type   ;
00361     e->value    =value  ;
00362     e->param[0] =p0     ;
00363     e->param[1] =p1     ;
00364     return e;
00365 }
00366 
00367 static int parse_pow(AVExpr **e, Parser *p, int *sign)
00368 {
00369     *sign= (*p->s == '+') - (*p->s == '-');
00370     p->s += *sign&1;
00371     return parse_primary(e, p);
00372 }
00373 
00374 static int parse_factor(AVExpr **e, Parser *p)
00375 {
00376     int sign, sign2, ret;
00377     AVExpr *e0, *e1, *e2;
00378     if ((ret = parse_pow(&e0, p, &sign)) < 0)
00379         return ret;
00380     while(p->s[0]=='^'){
00381         e1 = e0;
00382         p->s++;
00383         if ((ret = parse_pow(&e2, p, &sign2)) < 0) {
00384             av_expr_free(e1);
00385             return ret;
00386         }
00387         e0 = new_eval_expr(e_pow, 1, e1, e2);
00388         if (!e0) {
00389             av_expr_free(e1);
00390             av_expr_free(e2);
00391             return AVERROR(ENOMEM);
00392         }
00393         if (e0->param[1]) e0->param[1]->value *= (sign2|1);
00394     }
00395     if (e0) e0->value *= (sign|1);
00396 
00397     *e = e0;
00398     return 0;
00399 }
00400 
00401 static int parse_term(AVExpr **e, Parser *p)
00402 {
00403     int ret;
00404     AVExpr *e0, *e1, *e2;
00405     if ((ret = parse_factor(&e0, p)) < 0)
00406         return ret;
00407     while (p->s[0]=='*' || p->s[0]=='/') {
00408         int c= *p->s++;
00409         e1 = e0;
00410         if ((ret = parse_factor(&e2, p)) < 0) {
00411             av_expr_free(e1);
00412             return ret;
00413         }
00414         e0 = new_eval_expr(c == '*' ? e_mul : e_div, 1, e1, e2);
00415         if (!e0) {
00416             av_expr_free(e1);
00417             av_expr_free(e2);
00418             return AVERROR(ENOMEM);
00419         }
00420     }
00421     *e = e0;
00422     return 0;
00423 }
00424 
00425 static int parse_subexpr(AVExpr **e, Parser *p)
00426 {
00427     int ret;
00428     AVExpr *e0, *e1, *e2;
00429     if ((ret = parse_term(&e0, p)) < 0)
00430         return ret;
00431     while (*p->s == '+' || *p->s == '-') {
00432         e1 = e0;
00433         if ((ret = parse_term(&e2, p)) < 0) {
00434             av_expr_free(e1);
00435             return ret;
00436         }
00437         e0 = new_eval_expr(e_add, 1, e1, e2);
00438         if (!e0) {
00439             av_expr_free(e1);
00440             av_expr_free(e2);
00441             return AVERROR(ENOMEM);
00442         }
00443     };
00444 
00445     *e = e0;
00446     return 0;
00447 }
00448 
00449 static int parse_expr(AVExpr **e, Parser *p)
00450 {
00451     int ret;
00452     AVExpr *e0, *e1, *e2;
00453     if (p->stack_index <= 0) //protect against stack overflows
00454         return AVERROR(EINVAL);
00455     p->stack_index--;
00456 
00457     if ((ret = parse_subexpr(&e0, p)) < 0)
00458         return ret;
00459     while (*p->s == ';') {
00460         p->s++;
00461         e1 = e0;
00462         if ((ret = parse_subexpr(&e2, p)) < 0) {
00463             av_expr_free(e1);
00464             return ret;
00465         }
00466         e0 = new_eval_expr(e_last, 1, e1, e2);
00467         if (!e0) {
00468             av_expr_free(e1);
00469             av_expr_free(e2);
00470             return AVERROR(ENOMEM);
00471         }
00472     };
00473 
00474     p->stack_index++;
00475     *e = e0;
00476     return 0;
00477 }
00478 
00479 static int verify_expr(AVExpr *e)
00480 {
00481     if (!e) return 0;
00482     switch (e->type) {
00483         case e_value:
00484         case e_const: return 1;
00485         case e_func0:
00486         case e_func1:
00487         case e_squish:
00488         case e_ld:
00489         case e_gauss:
00490         case e_isnan:
00491         case e_floor:
00492         case e_ceil:
00493         case e_trunc:
00494         case e_sqrt:
00495         case e_not:
00496         case e_random:
00497             return verify_expr(e->param[0]);
00498         default: return verify_expr(e->param[0]) && verify_expr(e->param[1]);
00499     }
00500 }
00501 
00502 int av_expr_parse(AVExpr **expr, const char *s,
00503                   const char * const *const_names,
00504                   const char * const *func1_names, double (* const *funcs1)(void *, double),
00505                   const char * const *func2_names, double (* const *funcs2)(void *, double, double),
00506                   int log_offset, void *log_ctx)
00507 {
00508     Parser p = { 0 };
00509     AVExpr *e = NULL;
00510     char *w = av_malloc(strlen(s) + 1);
00511     char *wp = w;
00512     const char *s0 = s;
00513     int ret = 0;
00514 
00515     if (!w)
00516         return AVERROR(ENOMEM);
00517 
00518     while (*s)
00519         if (!isspace(*s++)) *wp++ = s[-1];
00520     *wp++ = 0;
00521 
00522     p.class      = &class;
00523     p.stack_index=100;
00524     p.s= w;
00525     p.const_names = const_names;
00526     p.funcs1      = funcs1;
00527     p.func1_names = func1_names;
00528     p.funcs2      = funcs2;
00529     p.func2_names = func2_names;
00530     p.log_offset = log_offset;
00531     p.log_ctx    = log_ctx;
00532 
00533     if ((ret = parse_expr(&e, &p)) < 0)
00534         goto end;
00535     if (*p.s) {
00536         av_expr_free(e);
00537         av_log(&p, AV_LOG_ERROR, "Invalid chars '%s' at the end of expression '%s'\n", p.s, s0);
00538         ret = AVERROR(EINVAL);
00539         goto end;
00540     }
00541     if (!verify_expr(e)) {
00542         av_expr_free(e);
00543         ret = AVERROR(EINVAL);
00544         goto end;
00545     }
00546     e->var= av_mallocz(sizeof(double) *VARS);
00547     *expr = e;
00548 end:
00549     av_free(w);
00550     return ret;
00551 }
00552 
00553 double av_expr_eval(AVExpr *e, const double *const_values, void *opaque)
00554 {
00555     Parser p = { 0 };
00556     p.var= e->var;
00557 
00558     p.const_values = const_values;
00559     p.opaque     = opaque;
00560     return eval_expr(&p, e);
00561 }
00562 
00563 int av_expr_parse_and_eval(double *d, const char *s,
00564                            const char * const *const_names, const double *const_values,
00565                            const char * const *func1_names, double (* const *funcs1)(void *, double),
00566                            const char * const *func2_names, double (* const *funcs2)(void *, double, double),
00567                            void *opaque, int log_offset, void *log_ctx)
00568 {
00569     AVExpr *e = NULL;
00570     int ret = av_expr_parse(&e, s, const_names, func1_names, funcs1, func2_names, funcs2, log_offset, log_ctx);
00571 
00572     if (ret < 0) {
00573         *d = NAN;
00574         return ret;
00575     }
00576     *d = av_expr_eval(e, const_values, opaque);
00577     av_expr_free(e);
00578     return isnan(*d) ? AVERROR(EINVAL) : 0;
00579 }
00580 
00581 #if FF_API_OLD_EVAL_NAMES
00582 // LCOV_EXCL_START
00583 int av_parse_expr(AVExpr **expr, const char *s,
00584                   const char * const *const_names,
00585                   const char * const *func1_names, double (* const *funcs1)(void *, double),
00586                   const char * const *func2_names, double (* const *funcs2)(void *, double, double),
00587                   int log_offset, void *log_ctx)
00588 {
00589     return av_expr_parse(expr, s, const_names, func1_names, funcs1, func2_names, funcs2,
00590                       log_offset, log_ctx);
00591 }
00592 
00593 double av_eval_expr(AVExpr *e, const double *const_values, void *opaque)
00594 {
00595     return av_expr_eval(e, const_values, opaque);
00596 }
00597 
00598 int av_parse_and_eval_expr(double *res, const char *s,
00599                            const char * const *const_names, const double *const_values,
00600                            const char * const *func1_names, double (* const *funcs1)(void *, double),
00601                            const char * const *func2_names, double (* const *funcs2)(void *, double, double),
00602                            void *opaque, int log_offset, void *log_ctx)
00603 {
00604     return av_expr_parse_and_eval(res, s, const_names, const_values, func1_names, funcs1, func2_names, funcs2,
00605                                   opaque, log_offset, log_ctx);
00606 }
00607 
00608 void av_free_expr(AVExpr *e)
00609 {
00610     av_expr_free(e);
00611 }
00612 // LCOV_EXCL_STOP
00613 #endif /* FF_API_OLD_EVAL_NAMES */
00614 
00615 #ifdef TEST
00616 // LCOV_EXCL_START
00617 #undef printf
00618 #include <string.h>
00619 
00620 static double const_values[] = {
00621     M_PI,
00622     M_E,
00623     0
00624 };
00625 
00626 static const char *const_names[] = {
00627     "PI",
00628     "E",
00629     0
00630 };
00631 
00632 int main(int argc, char **argv)
00633 {
00634     int i;
00635     double d;
00636     const char **expr, *exprs[] = {
00637         "",
00638         "1;2",
00639         "-20",
00640         "-PI",
00641         "+PI",
00642         "1+(5-2)^(3-1)+1/2+sin(PI)-max(-2.2,-3.1)",
00643         "80G/80Gi",
00644         "1k",
00645         "1Gi",
00646         "1gi",
00647         "1GiFoo",
00648         "1k+1k",
00649         "1Gi*3foo",
00650         "foo",
00651         "foo(",
00652         "foo()",
00653         "foo)",
00654         "sin",
00655         "sin(",
00656         "sin()",
00657         "sin)",
00658         "sin 10",
00659         "sin(1,2,3)",
00660         "sin(1 )",
00661         "1",
00662         "1foo",
00663         "bar + PI + E + 100f*2 + foo",
00664         "13k + 12f - foo(1, 2)",
00665         "1gi",
00666         "1Gi",
00667         "st(0, 123)",
00668         "st(1, 123); ld(1)",
00669         /* compute 1+2+...+N */
00670         "st(0, 1); while(lte(ld(0), 100), st(1, ld(1)+ld(0));st(0, ld(0)+1)); ld(1)",
00671         /* compute Fib(N) */
00672         "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)",
00673         "while(0, 10)",
00674         "st(0, 1); while(lte(ld(0),100), st(1, ld(1)+ld(0)); st(0, ld(0)+1))",
00675         "isnan(1)",
00676         "isnan(NAN)",
00677         "floor(NAN)",
00678         "floor(123.123)",
00679         "floor(-123.123)",
00680         "trunc(123.123)",
00681         "trunc(-123.123)",
00682         "ceil(123.123)",
00683         "ceil(-123.123)",
00684         "sqrt(1764)",
00685         "isnan(sqrt(-1))",
00686         "not(1)",
00687         "not(NAN)",
00688         "not(0)",
00689         "pow(0,1.23)",
00690         "pow(PI,1.23)",
00691         "PI^1.23",
00692         "pow(-1,1.23)",
00693         NULL
00694     };
00695 
00696     for (expr = exprs; *expr; expr++) {
00697         printf("Evaluating '%s'\n", *expr);
00698         av_expr_parse_and_eval(&d, *expr,
00699                                const_names, const_values,
00700                                NULL, NULL, NULL, NULL, NULL, 0, NULL);
00701         if(isnan(d)){
00702             printf("'%s' -> nan\n\n", *expr);
00703         }else{
00704             printf("'%s' -> %f\n\n", *expr, d);
00705         }
00706     }
00707 
00708     av_expr_parse_and_eval(&d, "1+(5-2)^(3-1)+1/2+sin(PI)-max(-2.2,-3.1)",
00709                            const_names, const_values,
00710                            NULL, NULL, NULL, NULL, NULL, 0, NULL);
00711     printf("%f == 12.7\n", d);
00712     av_expr_parse_and_eval(&d, "80G/80Gi",
00713                            const_names, const_values,
00714                            NULL, NULL, NULL, NULL, NULL, 0, NULL);
00715     printf("%f == 0.931322575\n", d);
00716 
00717     if (argc > 1 && !strcmp(argv[1], "-t")) {
00718         for (i = 0; i < 1050; i++) {
00719             START_TIMER;
00720             av_expr_parse_and_eval(&d, "1+(5-2)^(3-1)+1/2+sin(PI)-max(-2.2,-3.1)",
00721                                    const_names, const_values,
00722                                    NULL, NULL, NULL, NULL, NULL, 0, NULL);
00723             STOP_TIMER("av_expr_parse_and_eval");
00724         }
00725     }
00726 
00727     return 0;
00728 }
00729 // LCOV_EXCL_STOP
00730 #endif