ref: 3a0e440fef1a9834cd377512485c407ec0213bce
dir: /common/libsndfile/src/wav_float.c/
/*
** Copyright (C) 1999-2000 Erik de Castro Lopo <erikd@zip.com.au>
**
** This program 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.
**
** This program 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 this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <math.h>
#include "sndfile.h"
#include "config.h"
#include "sfendian.h"
#include "common.h"
#include "wav.h"
/*--------------------------------------------------------------------------------------------
** Prototypes for private functions.
*/
static void x86f2s_array (float *buffer, unsigned int count, short *ptr, int index) ;
static void x86f2i_array (float *buffer, unsigned int count, int *ptr, int index) ;
static void x86f2d_array (float *buffer, unsigned int count, double *ptr, int index, double normfact) ;
static void s2x86f_array (short *ptr, int index, float *buffer, unsigned int count) ;
static void i2x86f_array (int *ptr, int index, float *buffer, unsigned int count) ;
static void d2x86f_array (double *ptr, int index, float *buffer, unsigned int count, double normfact) ;
/*--------------------------------------------------------------------------------------------
** Exported functions.
*/
int wav_read_x86f2s (SF_PRIVATE *psf, short *ptr, int len)
{ unsigned int bytecount, readcount, bufferlen, thisread ;
int index = 0, total = 0 ;
bufferlen = (SF_BUFFER_LEN / psf->blockwidth) * psf->blockwidth ;
bytecount = len * psf->bytewidth ;
while (bytecount > 0)
{ readcount = (bytecount >= bufferlen) ? bufferlen : bytecount ;
thisread = fread (psf->buffer, 1, readcount, psf->file) ;
x86f2s_array ((float*) (psf->buffer), thisread / psf->bytewidth, ptr, index) ;
total += thisread ;
if (thisread < readcount)
break ;
index += thisread / psf->bytewidth ;
bytecount -= thisread ;
} ;
total /= psf->bytewidth ;
if (total < len)
psf->error = SFE_SHORT_READ ;
return total ;
} /* wav_read_x86f2s */
int wav_read_x86f2i (SF_PRIVATE *psf, int *ptr, int len)
{ unsigned int bytecount, readcount, bufferlen, thisread ;
int index = 0, total = 0 ;
bufferlen = (SF_BUFFER_LEN / psf->blockwidth) * psf->blockwidth ;
bytecount = len * psf->bytewidth ;
while (bytecount > 0)
{ readcount = (bytecount >= bufferlen) ? bufferlen : bytecount ;
thisread = fread (psf->buffer, 1, readcount, psf->file) ;
x86f2i_array ((float*) (psf->buffer), thisread / psf->bytewidth, ptr, index) ;
total += thisread ;
if (thisread < readcount)
break ;
index += thisread / psf->bytewidth ;
bytecount -= thisread ;
} ;
total /= psf->bytewidth ;
if (total < len)
psf->error = SFE_SHORT_READ ;
return total ;
} /* wav_read_x86f2i */
int wav_read_x86f2d (SF_PRIVATE *psf, double *ptr, int len, int normalize)
{ unsigned int bytecount, readcount, bufferlen, thisread ;
int index = 0, total = 0 ;
double normfact ;
normfact = normalize ? 1.0 : 1.0 ;
bufferlen = (SF_BUFFER_LEN / psf->blockwidth) * psf->blockwidth ;
bytecount = len * psf->bytewidth ;
while (bytecount > 0)
{ readcount = (bytecount >= bufferlen) ? bufferlen : bytecount ;
thisread = fread (psf->buffer, 1, readcount, psf->file) ;
x86f2d_array ((float*) (psf->buffer), thisread / psf->bytewidth, ptr, index, normfact) ;
total += thisread ;
if (thisread < readcount)
break ;
index += thisread / psf->bytewidth ;
bytecount -= thisread ;
} ;
total /= psf->bytewidth ;
if (total < len)
psf->error = SFE_SHORT_READ ;
return total ;
} /* wav_read_x86f2d */
int wav_write_s2x86f (SF_PRIVATE *psf, short *ptr, int len)
{ unsigned int bytecount, writecount, bufferlen, thiswrite ;
int index = 0, total = 0 ;
bufferlen = (SF_BUFFER_LEN / psf->blockwidth) * psf->blockwidth ;
bytecount = len * psf->bytewidth ;
while (bytecount > 0)
{ writecount = (bytecount >= bufferlen) ? bufferlen : bytecount ;
s2x86f_array (ptr, index, (float*) (psf->buffer), writecount / psf->bytewidth) ;
thiswrite = fwrite (psf->buffer, 1, writecount, psf->file) ;
total += thiswrite ;
if (thiswrite < writecount)
break ;
index += thiswrite / psf->bytewidth ;
bytecount -= thiswrite ;
} ;
total /= psf->bytewidth ;
if (total < len)
psf->error = SFE_SHORT_WRITE ;
return total ;
} /* wav_write_s2x86f */
int wav_write_i2x86f (SF_PRIVATE *psf, int *ptr, int len)
{ unsigned int bytecount, writecount, bufferlen, thiswrite ;
int index = 0, total = 0 ;
bufferlen = (SF_BUFFER_LEN / psf->blockwidth) * psf->blockwidth ;
bytecount = len * psf->bytewidth ;
while (bytecount > 0)
{ writecount = (bytecount >= bufferlen) ? bufferlen : bytecount ;
i2x86f_array (ptr, index, (float*) (psf->buffer), writecount / psf->bytewidth) ;
thiswrite = fwrite (psf->buffer, 1, writecount, psf->file) ;
total += thiswrite ;
if (thiswrite < writecount)
break ;
index += thiswrite / psf->bytewidth ;
bytecount -= thiswrite ;
} ;
total /= psf->bytewidth ;
if (total < len)
psf->error = SFE_SHORT_WRITE ;
return total ;
} /* wav_write_i2x86f */
int wav_write_d2x86f (SF_PRIVATE *psf, double *ptr, int len, int normalize)
{ unsigned int bytecount, writecount, bufferlen, thiswrite ;
int index = 0, total = 0 ;
double normfact ;
normfact = (normalize) ? 1.0 : 1.0 ;
bufferlen = (SF_BUFFER_LEN / psf->blockwidth) * psf->blockwidth ;
bytecount = len * psf->bytewidth ;
while (bytecount > 0)
{ writecount = (bytecount >= bufferlen) ? bufferlen : bytecount ;
d2x86f_array (ptr, index, (float*) (psf->buffer), writecount / psf->bytewidth, normfact) ;
thiswrite = fwrite (psf->buffer, 1, writecount, psf->file) ;
total += thiswrite ;
if (thiswrite < writecount)
break ;
index += thiswrite / psf->bytewidth ;
bytecount -= thiswrite ;
} ;
total /= psf->bytewidth ;
if (total < len)
psf->error = SFE_SHORT_WRITE ;
return total ;
} /* wav_write_d2x86f */
/*==============================================================================================
** Private functions.
*/
static
float read_x86float (unsigned char *cptr)
{ int exponent, mantissa ;
float fvalue ;
exponent = ((cptr [3] & 0x7F) << 1) | ((cptr [2] & 0x80) ? 1 : 0);
mantissa = ((cptr [2] & 0x7F) << 16) | (cptr [1] << 8) | (cptr [0]) ;
if (! (exponent || mantissa))
return 0.0 ;
mantissa |= 0x800000 ;
exponent = exponent ? exponent - 127 : 0 ;
fvalue = mantissa ? ((float) mantissa) / ((float) 0x800000) : 0.0 ;
if (cptr [3] & 0x80)
fvalue *= -1 ;
if (exponent > 0)
fvalue *= (1 << exponent) ;
else if (exponent < 0)
fvalue /= (1 << abs (exponent)) ;
return fvalue ;
} /* read_x86float */
static
void write_x86float (double in, unsigned char *out)
{ int exponent, mantissa ;
*((int*) out) = 0 ;
if (in == 0.0)
return ;
if (in < 0.0)
{ in *= -1.0 ;
out [3] |= 0x80 ;
} ;
in = frexp (in, &exponent) ;
exponent += 126 ;
if (exponent & 0x01)
out [2] |= 0x80 ;
out [3] |= (exponent >> 1) & 0x7F ;
in *= (float) 0x1000000 ;
mantissa = (((int) in) & 0x7FFFFF) ;
out [0] = mantissa & 0xFF ;
out [1] = (mantissa >> 8) & 0xFF ;
out [2] |= (mantissa >> 16) & 0x7F ;
return ;
} /* write_x86float */
/*----------------------------------------------------------------------------------------------
*/
static
void x86f2s_array (float *buffer, unsigned int count, short *ptr, int index)
{ int k ;
for (k = 0 ; k < count ; k++)
{ ptr [index] = ((short) read_x86float ((unsigned char *) (buffer +k))) ;
index ++ ;
} ;
} /* x86f2s_array */
static
void x86f2i_array (float *buffer, unsigned int count, int *ptr, int index)
{ int k ;
for (k = 0 ; k < count ; k++)
{ ptr [index] = ((int) read_x86float ((unsigned char *) (buffer +k))) ;
index ++ ;
} ;
} /* x86f2i_array */
static
void x86f2d_array (float *buffer, unsigned int count, double *ptr, int index, double normfact)
{ int k ;
for (k = 0 ; k < count ; k++)
{ ptr [index] = ((double) read_x86float ((unsigned char *) (buffer +k))) * normfact ;
index ++ ;
} ;
} /* x86f2d_array */
static
void s2x86f_array (short *ptr, int index, float *buffer, unsigned int count)
{ int k ;
float value ;
for (k = 0 ; k < count ; k++)
{ value = (float) (ptr [index]) ;
write_x86float (value, (unsigned char*) (buffer + k)) ;
index ++ ;
} ;
} /* s2x86f_array */
static
void i2x86f_array (int *ptr, int index, float *buffer, unsigned int count)
{ int k ;
float value ;
for (k = 0 ; k < count ; k++)
{ value = (float) (ptr [index]) ;
write_x86float (value, (unsigned char*) (buffer + k)) ;
index ++ ;
} ;
} /* i2x86f_array */
static
void d2x86f_array (double *ptr, int index, float *buffer, unsigned int count, double normfact)
{ int k ;
float value ;
for (k = 0 ; k < count ; k++)
{ value = (float) (ptr [index] * normfact) ;
write_x86float (value, (unsigned char*) (buffer + k)) ;
index ++ ;
} ;
} /* d2x86f_array */