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Add support for SI (k, M, ...) and IEC/IEEE (Ki, Mi, ...) units.

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Originally committed as revision 6287 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Panagiotis Issaris 2006-09-18 11:35:48 +00:00
parent e9e12f0e11
commit 97c73545a5
2 changed files with 55 additions and 57 deletions
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37
libavcodec/eval.c
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@ -64,49 +64,14 @@ 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,
['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;
int i;
/* number */
d= strtod(p->s, &next);
d= av_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;
}

75
libavcodec/opt.c
View File

@ -27,30 +27,63 @@
#include "avcodec.h"
#include "opt.h"
/**
* strtod() function extended with 'k', 'M' and 'B' postfixes.
* This allows using kB, MB, k, M and B as a postfix. This function
* assumes that the unit of numbers is bits not bytes.
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 av_strtod(const char *name, char **tail) {
double d;
d= strtod(name, tail);
if(*tail>name && (**tail=='k')) {
d*=1000;
(*tail)++;
}
else if(*tail && (**tail=='M')) {
d*=1000000;
(*tail)++;
}
else if(*tail && (**tail=='G')) {
d*=1000000000;
(*tail)++;
}
if(*tail && (**tail=='B')) {
d*=8;
(*tail)++;
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;
}