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AIFF format support by (Patrick Guimond <patg a.t patg d.o.t homeunix d.o.t org)

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Originally committed as revision 4924 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer
2006-02-02 15:21:19 +00:00
parent 93d3e278cd
commit f11288dab4
9 changed files with 547 additions and 1 deletions
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43
libavutil/intfloat_readwrite.c
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@@ -38,6 +38,23 @@ float av_int2flt(int32_t v){
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;
@@ -53,3 +70,29 @@ int32_t av_flt2int(float d){
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;
}