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author | Michael Niedermayer <michaelni@gmx.at> | 2005-07-19 13:29:13 +0000 |
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committer | Michael Niedermayer <michaelni@gmx.at> | 2005-07-19 13:29:13 +0000 |
commit | ea4377de8c65054a1fcc0744de8b9602e3d72363 (patch) | |
tree | efd29dc64cfc7e625026a9c60093f1d01d71d7fa | |
parent | ba85e70c5439a5381c83433bd64220289c7800b1 (diff) | |
download | ffmpeg-ea4377de8c65054a1fcc0744de8b9602e3d72363.tar.gz |
portable IEEE float/double read/write functions
Originally committed as revision 4457 to svn://svn.ffmpeg.org/ffmpeg/trunk
-rw-r--r-- | libavcodec/utils.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/libavcodec/utils.c b/libavcodec/utils.c index 0a0971fc3e..2748aeec1d 100644 --- a/libavcodec/utils.c +++ b/libavcodec/utils.c @@ -992,6 +992,34 @@ int64_t ff_gcd(int64_t a, int64_t b){ else return a; } +double av_int2dbl(int64_t v){ + if(v+v > 0xFFELLU<<52) + return 0.0/0.0; + return ldexp(((v&(1LL<<52)-1) + (1LL<<52)) * (v>>63|1), (v>>52&0x7FF)-1075); +} + +float av_int2flt(int32_t v){ + if(v+v > 0xFF000000U) + return 0.0/0.0; + return ldexp(((v&0x7FFFFF) + (1<<23)) * (v>>31|1), (v>>23&0xFF)-150); +} + +int64_t av_dbl2int(double d){ + int e; + if ( !d) return 0; + else if(d-d) return 0x7FF0000000000000LL + ((int64_t)(d<0)<<63) + (d!=d); + d= frexp(d, &e); + return (int64_t)(d<0)<<63 | (e+1022LL)<<52 | (int64_t)((fabs(d)-0.5)*(1LL<<53)); +} + +int32_t av_flt2int(float d){ + int e; + if ( !d) return 0; + else if(d-d) return 0x7F800000 + ((d<0)<<31) + (d!=d); + d= frexp(d, &e); + return (d<0)<<31 | (e+126)<<23 | (int64_t)((fabs(d)-0.5)*(1<<24)); +} + /* av_log API */ static int av_log_level = AV_LOG_INFO; |