diff options
Diffstat (limited to 'libavutil/eval.c')
| -rw-r--r-- | libavutil/eval.c | 186 |
1 files changed, 174 insertions, 12 deletions
diff --git a/libavutil/eval.c b/libavutil/eval.c index 9d17930..dc2fb45 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); @@ -177,6 +262,7 @@ static double eval_expr(Parser *p, AVExpr *e) 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; @@ -544,7 +659,42 @@ int av_expr_parse_and_eval(double *d, const char *s, return isnan(*d) ? AVERROR(EINVAL) : 0; } +#if FF_API_OLD_EVAL_NAMES +// LCOV_EXCL_START +int av_parse_expr(AVExpr **expr, const char *s, + const char * const *const_names, + const char * const *func1_names, double (* const *funcs1)(void *, double), + const char * const *func2_names, double (* const *funcs2)(void *, double, double), + int log_offset, void *log_ctx) +{ + return av_expr_parse(expr, s, const_names, func1_names, funcs1, func2_names, funcs2, + log_offset, log_ctx); +} + +double av_eval_expr(AVExpr *e, const double *const_values, void *opaque) +{ + return av_expr_eval(e, const_values, opaque); +} + +int av_parse_and_eval_expr(double *res, const char *s, + const char * const *const_names, const double *const_values, + const char * const *func1_names, double (* const *funcs1)(void *, double), + const char * const *func2_names, double (* const *funcs2)(void *, double, double), + void *opaque, int log_offset, void *log_ctx) +{ + return av_expr_parse_and_eval(res, s, const_names, const_values, func1_names, funcs1, func2_names, funcs2, + opaque, log_offset, log_ctx); +} + +void av_free_expr(AVExpr *e) +{ + av_expr_free(e); +} +// LCOV_EXCL_STOP +#endif /* FF_API_OLD_EVAL_NAMES */ + #ifdef TEST +// LCOV_EXCL_START #undef printf #include <string.h> @@ -629,6 +779,17 @@ 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)", NULL }; @@ -664,4 +825,5 @@ int main(int argc, char **argv) return 0; } +// LCOV_EXCL_STOP #endif |
