ffmpeg/libavutil/intfloat_readwrite.c
Michael Niedermayer b81f8880e0 Merge remote-tracking branch 'qatar/master'
* qatar/master: (23 commits)
  fix AC3ENC_OPT_MODE_ON/OFF
  h264: fix HRD parameters parsing
  prores: implement multithreading.
  prores: idct sse2/sse4 optimizations.
  swscale: use aligned move for storage into temporary buffer.
  prores: extract idct into its own dspcontext and merge with put_pixels.
  h264: fix invalid shifts in init_cavlc_level_tab()
  intfloat_readwrite: fix signed addition overflows
  mov: do not misreport empty stts
  mov: cosmetics, fix for and if spacing
  id3v2: fix NULL pointer dereference
  mov: read album_artist atom
  mov: fix disc/track numbers and totals
  doc: fix references to obsolete presets directories for avconv/ffmpeg
  flashsv: return more meaningful error value
  flashsv: fix typo in av_log() message
  smacker: validate channels and sample format.
  smacker: check buffer size before reading output size
  smacker: validate number of channels
  smacker: Separate audio flags from sample rates in smacker demuxer.
  ...

Conflicts:
	cmdutils.h
	doc/ffmpeg.texi
	libavcodec/Makefile
	libavcodec/motion_est_template.c
	libavformat/id3v2.c
	libavformat/mov.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
2011-10-12 05:40:57 +02:00

99 lines
2.9 KiB
C

/*
* portable IEEE float/double read/write functions
*
* Copyright (c) 2005 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
*/
/**
* @file
* portable IEEE float/double read/write functions
*/
#include <stdint.h>
#include "mathematics.h"
#include "intfloat_readwrite.h"
double av_int2dbl(int64_t v){
if((uint64_t)v+v > 0xFFEULL<<52)
return NAN;
return ldexp(((v&((1LL<<52)-1)) + (1LL<<52)) * (v>>63|1), (v>>52&0x7FF)-1075);
}
float av_int2flt(int32_t v){
if((uint32_t)v+v > 0xFF000000U)
return NAN;
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 = (m<<8) + ext.mantissa[i];
e = (((int)ext.exponent[0]&0x7f)<<8) | ext.exponent[1];
if (e == 0x7fff && m)
return NAN;
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)
m= -m;
return ldexp(m, e);
}
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));
}
AVExtFloat av_dbl2ext(double d){
struct AVExtFloat ext= {{0}};
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) {
ext.exponent[0] = 0x7f; ext.exponent[1] = 0xff;
if (f != INFINITY)
ext.mantissa[0] = ~0;
}
if (d < 0)
ext.exponent[0] |= 0x80;
return ext;
}