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support SI and some non SI prefixes 

Originally committed as revision 6284 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2006-09-17 08:52:41 +00:00
parent 99f6278e31
commit e66477afbe
1 changed files with 34 additions and 0 deletions
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34
libavcodec/eval.c
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@ -64,6 +64,28 @@ static int strmatch(const char *s, const char *prefix){
return 1;
}
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,
['M'-'E']= 6,
['G'-'E']= 9,
['T'-'E']= 12,
['P'-'E']= 15,
['E'-'E']= 18,
['Z'-'E']= 21,
['Y'-'E']= 24,
};
static double evalPrimary(Parser *p){
double d, d2=NAN;
char *next= p->s;
@ -72,6 +94,18 @@ static double evalPrimary(Parser *p){
/* number */
d= strtod(p->s, &next);
if(next != p->s){
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++;
}
}
}
p->s= next;
return d;
}