return ldexp(((v&0x7FFFFF) + (1<<23)) * (v>>31|1), (v>>23&0xFF)-150);
}
+double av_ext2dbl(const AVExtFloat ext){
+ uint64_t m = 0;
+ int e, i;
+
+ for (i = 0; i < 8; i++)
+ m |= (uint64_t)ext.mantissa[i]<<(56-(i<<3));
+ e = (((int)ext.exponent[0]&0x7f)<<8) | ext.exponent[1];
+ if (e == 0x7fff && m)
+ return 0.0/0.0;
+ e -= 16383 + 63; /* In IEEE 80 bits, the whole (i.e. 1.xxxx)
+ * mantissa bit is written as opposed to the
+ * single and double precision formats */
+ if (ext.exponent[0]&0x80)
+ return ldexp(-m, e);
+ return ldexp(m, e);
+}
+
int64_t av_dbl2int(double d){
int e;
if ( !d) return 0;
d= frexp(d, &e);
return (d<0)<<31 | (e+126)<<23 | (int64_t)((fabs(d)-0.5)*(1<<24));
}
+
+AVExtFloat av_dbl2ext(double d){
+ struct AVExtFloat ext;
+ int e, i; double f; uint64_t m;
+
+ f = fabs(frexp(d, &e));
+ if (f >= 0.5 && f < 1) {
+ e += 16382;
+ ext.exponent[0] = e>>8;
+ ext.exponent[1] = e;
+ m = (uint64_t)ldexp(f, 64);
+ for (i=0; i < 8; i++)
+ ext.mantissa[i] = m>>(56-(i<<3));
+ } else if (f == 0.0) {
+ memset (&ext, 0, 10);
+ } else {
+ ext.exponent[0] = 0x7f; ext.exponent[1] = 0xff;
+ memset (&ext.mantissa, 0, 8);
+ if (f != 1/0.0)
+ ext.mantissa[0] = ~0;
+ }
+ if (d < 0)
+ ext.exponent[0] |= 0x80;
+ return ext;
+}
+