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Diffstat (limited to 'src/libffmpeg/libavcodec/eval.c')
-rw-r--r--src/libffmpeg/libavcodec/eval.c226
1 files changed, 0 insertions, 226 deletions
diff --git a/src/libffmpeg/libavcodec/eval.c b/src/libffmpeg/libavcodec/eval.c
deleted file mode 100644
index 5b0e51d62..000000000
--- a/src/libffmpeg/libavcodec/eval.c
+++ /dev/null
@@ -1,226 +0,0 @@
-/*
- * simple arithmetic expression evaluator
- *
- * Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
- *
- * This library 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 of the License, or (at your option) any later version.
- *
- * This library 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 this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- *
- */
-
-/**
- * @file eval.c
- * simple arithmetic expression evaluator.
- *
- * see http://joe.hotchkiss.com/programming/eval/eval.html
- */
-
-#include "avcodec.h"
-#include "mpegvideo.h"
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <math.h>
-
-#ifndef NAN
- #define NAN 0
-#endif
-
-#ifndef M_PI
-#define M_PI 3.14159265358979323846
-#endif
-
-typedef struct Parser{
- int stack_index;
- char *s;
- double *const_value;
- const char **const_name; // NULL terminated
- double (**func1)(void *, double a); // NULL terminated
- const char **func1_name; // NULL terminated
- double (**func2)(void *, double a, double b); // NULL terminated
- char **func2_name; // NULL terminated
- void *opaque;
-} Parser;
-
-static double evalExpression(Parser *p);
-
-static int strmatch(const char *s, const char *prefix){
- int i;
- for(i=0; prefix[i]; i++){
- if(prefix[i] != s[i]) return 0;
- }
- return 1;
-}
-
-static double evalPrimary(Parser *p){
- double d, d2=NAN;
- char *next= p->s;
- int i;
-
- /* number */
- d= strtod(p->s, &next);
- if(next != p->s){
- p->s= next;
- return d;
- }
-
- /* named constants */
- for(i=0; p->const_name && p->const_name[i]; i++){
- if(strmatch(p->s, p->const_name[i])){
- p->s+= strlen(p->const_name[i]);
- return p->const_value[i];
- }
- }
-
- p->s= strchr(p->s, '(');
- if(p->s==NULL){
- av_log(NULL, AV_LOG_ERROR, "Parser: missing ( in \"%s\"\n", next);
- return NAN;
- }
- p->s++; // "("
- d= evalExpression(p);
- if(p->s[0]== ','){
- p->s++; // ","
- d2= evalExpression(p);
- }
- if(p->s[0] != ')'){
- av_log(NULL, AV_LOG_ERROR, "Parser: missing ) in \"%s\"\n", next);
- return NAN;
- }
- p->s++; // ")"
-
- if( strmatch(next, "sinh" ) ) d= sinh(d);
- else if( strmatch(next, "cosh" ) ) d= cosh(d);
- else if( strmatch(next, "tanh" ) ) d= tanh(d);
- else if( strmatch(next, "sin" ) ) d= sin(d);
- else if( strmatch(next, "cos" ) ) d= cos(d);
- else if( strmatch(next, "tan" ) ) d= tan(d);
- else if( strmatch(next, "exp" ) ) d= exp(d);
- else if( strmatch(next, "log" ) ) d= log(d);
- else if( strmatch(next, "squish") ) d= 1/(1+exp(4*d));
- else if( strmatch(next, "gauss" ) ) d= exp(-d*d/2)/sqrt(2*M_PI);
- else if( strmatch(next, "abs" ) ) d= fabs(d);
- else if( strmatch(next, "max" ) ) d= d > d2 ? d : d2;
- else if( strmatch(next, "min" ) ) d= d < d2 ? d : d2;
- else if( strmatch(next, "gt" ) ) d= d > d2 ? 1.0 : 0.0;
- else if( strmatch(next, "gte" ) ) d= d >= d2 ? 1.0 : 0.0;
- else if( strmatch(next, "lt" ) ) d= d > d2 ? 0.0 : 1.0;
- else if( strmatch(next, "lte" ) ) d= d >= d2 ? 0.0 : 1.0;
- else if( strmatch(next, "eq" ) ) d= d == d2 ? 1.0 : 0.0;
- else if( strmatch(next, "(" ) ) d= d;
-// else if( strmatch(next, "l1" ) ) d= 1 + d2*(d - 1);
-// else if( strmatch(next, "sq01" ) ) d= (d >= 0.0 && d <=1.0) ? 1.0 : 0.0;
- else{
- for(i=0; p->func1_name && p->func1_name[i]; i++){
- if(strmatch(next, p->func1_name[i])){
- return p->func1[i](p->opaque, d);
- }
- }
-
- for(i=0; p->func2_name && p->func2_name[i]; i++){
- if(strmatch(next, p->func2_name[i])){
- return p->func2[i](p->opaque, d, d2);
- }
- }
-
- av_log(NULL, AV_LOG_ERROR, "Parser: unknown function in \"%s\"\n", next);
- return NAN;
- }
-
- return d;
-}
-
-static double evalPow(Parser *p){
- int sign= (*p->s == '+') - (*p->s == '-');
- p->s += sign&1;
- return (sign|1) * evalPrimary(p);
-}
-
-static double evalFactor(Parser *p){
- double ret= evalPow(p);
- while(p->s[0]=='^'){
- p->s++;
- ret= pow(ret, evalPow(p));
- }
- return ret;
-}
-
-static double evalTerm(Parser *p){
- double ret= evalFactor(p);
- while(p->s[0]=='*' || p->s[0]=='/'){
- if(*p->s++ == '*') ret*= evalFactor(p);
- else ret/= evalFactor(p);
- }
- return ret;
-}
-
-static double evalExpression(Parser *p){
- double ret= 0;
-
- if(p->stack_index <= 0) //protect against stack overflows
- return NAN;
- p->stack_index--;
-
- do{
- ret += evalTerm(p);
- }while(*p->s == '+' || *p->s == '-');
-
- p->stack_index++;
-
- return ret;
-}
-
-double ff_eval(char *s, double *const_value, const char **const_name,
- double (**func1)(void *, double), const char **func1_name,
- double (**func2)(void *, double, double), char **func2_name,
- void *opaque){
- Parser p;
-
- p.stack_index=100;
- p.s= s;
- p.const_value= const_value;
- p.const_name = const_name;
- p.func1 = func1;
- p.func1_name = func1_name;
- p.func2 = func2;
- p.func2_name = func2_name;
- p.opaque = opaque;
-
- return evalExpression(&p);
-}
-
-#ifdef TEST
-#undef printf
-static double const_values[]={
- M_PI,
- M_E,
- 0
-};
-static const char *const_names[]={
- "PI",
- "E",
- 0
-};
-main(){
- int i;
- printf("%f == 12.7\n", ff_eval("1+(5-2)^(3-1)+1/2+sin(PI)-max(-2.2,-3.1)", const_values, const_names, NULL, NULL, NULL, NULL, NULL));
-
- for(i=0; i<1050; i++){
- START_TIMER
- ff_eval("1+(5-2)^(3-1)+1/2+sin(PI)-max(-2.2,-3.1)", const_values, const_names, NULL, NULL, NULL, NULL, NULL);
- STOP_TIMER("ff_eval")
- }
-}
-#endif
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