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#include <math.h>
#include <stdio.h>
#include <stdlib.h>
//#if 1 //(UGLY_IEEE754_FLOAT32_HACK :-)
/*
static inline float todB_a(const float *x){
return (float)((*(int *)x)&0x7fffffff) * 7.17711438e-7f -764.6161886f;
}
*/
static inline float todB_a(const float *x){
union {
//int32_t i;
int i;
float f;
} ix;
ix.f = *x;
ix.i = ix.i&0x7fffffff;
return (float)(ix.i * 7.17711438e-7f -764.6161886f);
}
//#else
static inline float todB_a2(const float *x){
return (*(x)==0?-400.f:logf(*(x)**(x))*4.34294480f);
}
//#endif
void test_todb_a() {
float f, dbav[32]={0.f}, dbaf[32]={0.f};
int i=0;
for(f=1024000.f;f>1.f;f/=2.f) {
dbaf[31-i]=f;
dbav[31-i]=todB_a(&f);
i++;
}
for (i=0;i<32;i++)
printf("f==%f\tv==%f\n", dbaf[i], dbav[i]);
}
void dump_testfile() {
int i,n;
float f[256];
FILE *fh=fopen("./test.raw", "r");
if (fh==NULL) return;
while ( (n=fread(f, sizeof(float), 256, fh)) > 0 ) {
for(i=0;i<n;i++) {
printf("%+.3f\t", f[i]);
}
}
fclose(fh);
}
int main() {
//test_todb_a();
dump_testfile();
return 0;
}
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