*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include <math.h>
#ifndef NAN
- #define NAN 0
+ #define NAN 0.0/0.0
#endif
#ifndef M_PI
double (**func2)(void *, double a, double b); // NULL terminated
char **func2_name; // NULL terminated
void *opaque;
+ char **error;
} Parser;
static double evalExpression(Parser *p);
+static int8_t si_prefixes['z' - 'E' + 1]={
+ ['y'-'E']= -24,
+ ['z'-'E']= -21,
+ ['a'-'E']= -18,
+ ['f'-'E']= -15,
+ ['p'-'E']= -12,
+ ['n'-'E']= - 9,
+ ['u'-'E']= - 6,
+ ['m'-'E']= - 3,
+ ['c'-'E']= - 2,
+ ['d'-'E']= - 1,
+ ['h'-'E']= 2,
+ ['k'-'E']= 3,
+ ['K'-'E']= 3,
+ ['M'-'E']= 6,
+ ['G'-'E']= 9,
+ ['T'-'E']= 12,
+ ['P'-'E']= 15,
+ ['E'-'E']= 18,
+ ['Z'-'E']= 21,
+ ['Y'-'E']= 24,
+};
+
+/** strtod() function extended with 'k', 'M', 'G', 'ki', 'Mi', 'Gi' and 'B'
+ * postfixes. This allows using f.e. kB, MiB, G and B as a postfix. This
+ * function assumes that the unit of numbers is bits not bytes.
+ */
+static double av_strtod(const char *name, char **tail) {
+ double d;
+ int p = 0;
+ char *next;
+ d = strtod(name, &next);
+ /* if parsing succeeded, check for and interpret postfixes */
+ if (next!=name) {
+
+ if(*next >= 'E' && *next <= 'z'){
+ int e= si_prefixes[*next - 'E'];
+ if(e){
+ if(next[1] == 'i'){
+ d*= pow( 2, e/0.3);
+ next+=2;
+ }else{
+ d*= pow(10, e);
+ next++;
+ }
+ }
+ }
+
+ if(*next=='B') {
+ d*=8;
+ *next++;
+ }
+ }
+ /* if requested, fill in tail with the position after the last parsed
+ character */
+ if (tail)
+ *tail = next;
+ return d;
+}
+
static int strmatch(const char *s, const char *prefix){
int i;
for(i=0; prefix[i]; i++){
int i;
/* number */
- d= strtod(p->s, &next);
+ d= av_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])){
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);
+ *p->error = "missing (";
+ p->s= next;
return NAN;
}
p->s++; // "("
d2= evalExpression(p);
}
if(p->s[0] != ')'){
- av_log(NULL, AV_LOG_ERROR, "Parser: missing ) in \"%s\"\n", next);
+ *p->error = "missing )";
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, "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, "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);
}
}
- av_log(NULL, AV_LOG_ERROR, "Parser: unknown function in \"%s\"\n", next);
+ *p->error = "unknown function";
return NAN;
}
return d;
-}
+}
static double evalPow(Parser *p){
int sign= (*p->s == '+') - (*p->s == '-');
return ret;
}
-double ff_eval(char *s, double *const_value, const char **const_name,
+double ff_eval2(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){
+ void *opaque, char **error){
Parser p;
-
+
p.stack_index=100;
p.s= s;
p.const_value= const_value;
p.func2 = func2;
p.func2_name = func2_name;
p.opaque = opaque;
-
+ p.error= error;
+
return evalExpression(&p);
}
+#if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
+attribute_deprecated 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){
+ char *error=NULL;
+ double ret;
+ ret = ff_eval2(s, const_value, const_name, func1, func1_name, func2, func2_name, opaque, &error);
+ if (error)
+ av_log(NULL, AV_LOG_ERROR, "Error evaluating \"%s\": %s\n", s, error);
+ return ret;
+}
+#endif
+
#ifdef TEST
-#undef printf
+#undef printf
static double const_values[]={
M_PI,
M_E,
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));
-
+ printf("%f == 0.931322575\n", ff_eval("80G/80Gi", 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);
projects / ffmpeg / blobdiff