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avutil/softfloat: Document public constants and a few public functions 

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2016-05-28 14:11:10 +02:00
parent a64a030ba0
commit d1520a6cfd
1 changed files with 24 additions and 7 deletions
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31
libavutil/softfloat.h
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@ -36,14 +36,18 @@ typedef struct SoftFloat{
int32_t exp; int32_t exp;
}SoftFloat; }SoftFloat;
static const SoftFloat FLOAT_0 = { 0, MIN_EXP}; static const SoftFloat FLOAT_0 = { 0, MIN_EXP}; ///< 0.0
static const SoftFloat FLOAT_05 = { 0x20000000, 0}; static const SoftFloat FLOAT_05 = { 0x20000000, 0}; ///< 0.5
static const SoftFloat FLOAT_1 = { 0x20000000, 1}; static const SoftFloat FLOAT_1 = { 0x20000000, 1}; ///< 1.0
static const SoftFloat FLOAT_EPSILON = { 0x29F16B12, -16}; static const SoftFloat FLOAT_EPSILON = { 0x29F16B12, -16}; ///< A small value
static const SoftFloat FLOAT_1584893192 = { 0x32B771ED, 1}; static const SoftFloat FLOAT_1584893192 = { 0x32B771ED, 1}; ///< 1.584893192 (10^.2)
static const SoftFloat FLOAT_100000 = { 0x30D40000, 17}; static const SoftFloat FLOAT_100000 = { 0x30D40000, 17}; ///< 100000
static const SoftFloat FLOAT_0999999 = { 0x3FFFFBCE, 0}; static const SoftFloat FLOAT_0999999 = { 0x3FFFFBCE, 0}; ///< 0.999999
/**
* Convert a SoftFloat to a double precision float.
*/
static inline av_const double av_sf2double(SoftFloat v) { static inline av_const double av_sf2double(SoftFloat v) {
v.exp -= ONE_BITS +1; v.exp -= ONE_BITS +1;
if(v.exp > 0) return (double)v.mant * (double)(1 << v.exp); if(v.exp > 0) return (double)v.mant * (double)(1 << v.exp);
@ -118,6 +122,12 @@ static inline av_const SoftFloat av_div_sf(SoftFloat a, SoftFloat b){
return a; return a;
} }
/**
* Compares two SoftFloats.
* @returns < 0 if the first is less
* > 0 if the first is greater
* 0 if they are equal
*/
static inline av_const int av_cmp_sf(SoftFloat a, SoftFloat b){ static inline av_const int av_cmp_sf(SoftFloat a, SoftFloat b){
int t= a.exp - b.exp; int t= a.exp - b.exp;
if (t <-31) return - b.mant ; if (t <-31) return - b.mant ;
@ -126,6 +136,10 @@ static inline av_const int av_cmp_sf(SoftFloat a, SoftFloat b){
else return a.mant ; else return a.mant ;
} }
/**
* Compares two SoftFloats.
* @returns 1 if a is greater than b, 0 otherwise
*/
static inline av_const int av_gt_sf(SoftFloat a, SoftFloat b) static inline av_const int av_gt_sf(SoftFloat a, SoftFloat b)
{ {
int t= a.exp - b.exp; int t= a.exp - b.exp;
@ -135,6 +149,9 @@ static inline av_const int av_gt_sf(SoftFloat a, SoftFloat b)
else return a.mant > 0 ; else return a.mant > 0 ;
} }
/**
* @returns the sum of 2 SoftFloats.
*/
static inline av_const SoftFloat av_add_sf(SoftFloat a, SoftFloat b){ static inline av_const SoftFloat av_add_sf(SoftFloat a, SoftFloat b){
int t= a.exp - b.exp; int t= a.exp - b.exp;
if (t <-31) return b; if (t <-31) return b;