X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavutil%2Fsoftfloat.h;h=97e09ea7e7ac4842aa07aed8d427711fadaf2c31;hb=56b44694bd540ad90e6b59e8345f608cb73a0135;hp=6b1831aebadb1a784a6da870a0276ee669b104e3;hpb=a2fd60437d0c7cf21a9365024efaa764bddaf3ab;p=ffmpeg

diff --git a/libavutil/softfloat.h b/libavutil/softfloat.h
index 6b1831aebad..97e09ea7e7a 100644
--- a/libavutil/softfloat.h
+++ b/libavutil/softfloat.h
@@ -1,4 +1,28 @@
-//copyright Michael Niedermayer 2006 license:LGPL
+/*
+ * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVUTIL_SOFTFLOAT_H
+#define AVUTIL_SOFTFLOAT_H
+
+#include <stdint.h>
+#include "common.h"
 
 #define MIN_EXP -126
 #define MAX_EXP  126
@@ -9,7 +33,7 @@ typedef struct SoftFloat{
     int32_t mant;
 }SoftFloat;
 
-static SoftFloat av_normalize_sf(SoftFloat a){
+static av_const SoftFloat av_normalize_sf(SoftFloat a){
     if(a.mant){
 #if 1
         while((a.mant + 0x20000000U)<0x40000000U){
@@ -31,7 +55,7 @@ static SoftFloat av_normalize_sf(SoftFloat a){
     return a;
 }
 
-static inline SoftFloat av_normalize1_sf(SoftFloat a){
+static inline av_const SoftFloat av_normalize1_sf(SoftFloat a){
 #if 1
     if(a.mant + 0x40000000 < 0){
         a.exp++;
@@ -48,56 +72,55 @@ static inline SoftFloat av_normalize1_sf(SoftFloat a){
 }
 
 /**
- *
- * @return will not be more denormalized then a+b, so if either input is
- *         normalized then the output wont be worse then the other input
- *         if both are normalized then the output will be normalized
+ * @return Will not be more denormalized than a+b. So if either input is
+ *         normalized, then the output will not be worse then the other input.
+ *         If both are normalized, then the output will be normalized.
  */
-static inline SoftFloat av_mul_sf(SoftFloat a, SoftFloat b){
+static inline av_const SoftFloat av_mul_sf(SoftFloat a, SoftFloat b){
     a.exp += b.exp;
     a.mant = (a.mant * (int64_t)b.mant) >> ONE_BITS;
     return av_normalize1_sf(a);
 }
 
 /**
- *
- * b has to be normalized and not zero
- * @return will not be more denormalized then a
+ * b has to be normalized and not zero.
+ * @return Will not be more denormalized than a.
  */
-static SoftFloat av_div_sf(SoftFloat a, SoftFloat b){
+static av_const SoftFloat av_div_sf(SoftFloat a, SoftFloat b){
     a.exp -= b.exp+1;
     a.mant = ((int64_t)a.mant<<(ONE_BITS+1)) / b.mant;
     return av_normalize1_sf(a);
 }
 
-static inline 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;
     if(t<0) return (a.mant >> (-t)) -  b.mant      ;
     else    return  a.mant          - (b.mant >> t);
 }
 
-static inline 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;
     if(t<0) return av_normalize1_sf((SoftFloat){b.exp, b.mant + (a.mant >> (-t))});
     else    return av_normalize1_sf((SoftFloat){a.exp, a.mant + (b.mant >>   t )});
 }
 
-static inline SoftFloat av_sub_sf(SoftFloat a, SoftFloat b){
+static inline av_const SoftFloat av_sub_sf(SoftFloat a, SoftFloat b){
     return av_add_sf(a, (SoftFloat){b.exp, -b.mant});
 }
 
 //FIXME sqrt, log, exp, pow, sin, cos
 
-static inline SoftFloat av_int2sf(int v, int frac_bits){
+static inline av_const SoftFloat av_int2sf(int v, int frac_bits){
     return av_normalize_sf((SoftFloat){ONE_BITS-frac_bits, v});
 }
 
 /**
- *
- * rounding is to -inf
+ * Rounding is to -inf.
  */
-static inline int av_sf2int(SoftFloat v, int frac_bits){
+static inline av_const int av_sf2int(SoftFloat v, int frac_bits){
     v.exp += frac_bits - ONE_BITS;
     if(v.exp >= 0) return v.mant <<  v.exp ;
     else           return v.mant >>(-v.exp);
 }
+
+#endif /* AVUTIL_SOFTFLOAT_H */