ref: 46d58fc082a8537f9de79342cd7d7d24974c984d
dir: /common/libsndfile/src/double64.c/
/*
** Copyright (C) 1999-2002 Erik de Castro Lopo <[email protected]>
**
** 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 "sndfile.h"
#include "config.h"
#include "sfendian.h"
#include "common.h"
#include "float_cast.h"
/*--------------------------------------------------------------------------------------------
** Processor floating point capabilities. double64_get_capability () returns one of the
** latter three values.
*/
enum
{ DOUBLE_UNKNOWN = 0x00,
DOUBLE_CAN_RW_LE = 0x23,
DOUBLE_CAN_RW_BE = 0x34,
DOUBLE_BROKEN_LE = 0x35,
DOUBLE_BROKEN_BE = 0x36
} ;
/*--------------------------------------------------------------------------------------------
** Prototypes for private functions.
*/
static sf_count_t host_read_d2s (SF_PRIVATE *psf, short *ptr, sf_count_t len) ;
static sf_count_t host_read_d2i (SF_PRIVATE *psf, int *ptr, sf_count_t len) ;
static sf_count_t host_read_d2f (SF_PRIVATE *psf, float *ptr, sf_count_t len) ;
static sf_count_t host_read_d (SF_PRIVATE *psf, double *ptr, sf_count_t len) ;
static sf_count_t host_write_s2d (SF_PRIVATE *psf, short *ptr, sf_count_t len) ;
static sf_count_t host_write_i2d (SF_PRIVATE *psf, int *ptr, sf_count_t len) ;
static sf_count_t host_write_f2d (SF_PRIVATE *psf, float *ptr, sf_count_t len) ;
static sf_count_t host_write_d (SF_PRIVATE *psf, double *ptr, sf_count_t len) ;
static void d2s_array (double *buffer, unsigned int count, short *ptr) ;
static void d2i_array (double *buffer, unsigned int count, int *ptr) ;
static void d2f_array (double *buffer, unsigned int count, float *ptr) ;
static void s2d_array (short *ptr, double *buffer, unsigned int count) ;
static void i2d_array (int *ptr, double *buffer, unsigned int count) ;
static void f2d_array (float *ptr, double *buffer, unsigned int count) ;
static void double64_peak_update (SF_PRIVATE *psf, double *buffer, int count, int index) ;
static int double64_get_capability (void) ;
/*--------------------------------------------------------------------------------------------
** Exported functions.
*/
int
double64_init (SF_PRIVATE *psf)
{ static int double64_caps = DOUBLE_UNKNOWN ;
if (double64_caps == DOUBLE_UNKNOWN)
double64_caps = double64_get_capability () ;
psf->blockwidth = sizeof (double) * psf->sf.channels ;
if (psf->mode == SFM_READ || psf->mode == SFM_RDWR)
{ switch (psf->endian + double64_caps)
{ case (SF_ENDIAN_BIG + DOUBLE_CAN_RW_BE) :
psf->float_endswap = SF_FALSE ;
psf->read_short = host_read_d2s ;
psf->read_int = host_read_d2i ;
psf->read_float = host_read_d2f ;
psf->read_double = host_read_d ;
break ;
case (SF_ENDIAN_LITTLE + DOUBLE_CAN_RW_LE) :
psf->float_endswap = SF_FALSE ;
psf->read_short = host_read_d2s ;
psf->read_int = host_read_d2i ;
psf->read_float = host_read_d2f ;
psf->read_double = host_read_d ;
break ;
case (SF_ENDIAN_BIG + DOUBLE_CAN_RW_LE) :
psf->float_endswap = SF_TRUE ;
psf->read_short = host_read_d2s ;
psf->read_int = host_read_d2i ;
psf->read_float = host_read_d2f ;
psf->read_double = host_read_d ;
break ;
case (SF_ENDIAN_LITTLE + DOUBLE_CAN_RW_BE) :
psf->float_endswap = SF_TRUE ;
psf->read_short = host_read_d2s ;
psf->read_int = host_read_d2i ;
psf->read_float = host_read_d2f ;
psf->read_double = host_read_d ;
break ;
default : break ;
} ;
} ;
if (psf->mode == SFM_WRITE || psf->mode == SFM_RDWR)
{ switch (psf->endian + double64_caps)
{ case (SF_ENDIAN_LITTLE + DOUBLE_CAN_RW_LE) :
psf->float_endswap = SF_FALSE ;
psf->write_short = host_write_s2d ;
psf->write_int = host_write_i2d ;
psf->write_float = host_write_f2d ;
psf->write_double = host_write_d ;
break ;
case (SF_ENDIAN_BIG + DOUBLE_CAN_RW_BE) :
psf->float_endswap = SF_FALSE ;
psf->write_short = host_write_s2d ;
psf->write_int = host_write_i2d ;
psf->write_float = host_write_f2d ;
psf->write_double = host_write_d ;
break ;
case (SF_ENDIAN_BIG + DOUBLE_CAN_RW_LE) :
psf->float_endswap = SF_TRUE ;
psf->write_short = host_write_s2d ;
psf->write_int = host_write_i2d ;
psf->write_float = host_write_f2d ;
psf->write_double = host_write_d ;
break ;
case (SF_ENDIAN_LITTLE + DOUBLE_CAN_RW_BE) :
psf->float_endswap = SF_TRUE ;
psf->write_short = host_write_s2d ;
psf->write_int = host_write_i2d ;
psf->write_float = host_write_f2d ;
psf->write_double = host_write_d ;
break ;
default : break ;
} ;
};
psf->filelength = psf_get_filelen (psf->filedes) ;
psf->datalength = (psf->dataend) ? psf->dataend - psf->dataoffset :
psf->filelength - psf->dataoffset ;
psf->sf.samples = psf->datalength / (psf->sf.channels * sizeof (double)) ;
return 0 ;
} /* double64_init */
double
double64_read (unsigned char *cptr)
{ int exponent, mantissa, negative ;
double fvalue ;
if (CPU_IS_LITTLE_ENDIAN)
{ negative = cptr [3] & 0x80 ;
exponent = ((cptr [3] & 0x7F) << 1) | ((cptr [2] & 0x80) ? 1 : 0);
mantissa = ((cptr [2] & 0x7F) << 16) | (cptr [1] << 8) | (cptr [0]) ;
}
else
{ negative = cptr [0] & 0x80 ;
exponent = ((cptr [0] & 0x7F) << 1) | ((cptr [1] & 0x80) ? 1 : 0);
mantissa = ((cptr [1] & 0x7F) << 16) | (cptr [2] << 8) | (cptr [3]) ;
} ;
if (! (exponent || mantissa))
return 0.0 ;
mantissa |= 0x800000 ;
exponent = exponent ? exponent - 127 : 0 ;
fvalue = mantissa ? ((float) mantissa) / ((float) 0x800000) : 0.0 ;
if (negative)
fvalue *= -1 ;
if (exponent > 0)
fvalue *= (1 << exponent) ;
else if (exponent < 0)
fvalue /= (1 << abs (exponent)) ;
return fvalue ;
} /* double64_read */
void
double64_write (double in, unsigned char *out)
{ int exponent, mantissa, negative = 0 ;
*((int*) out) = 0 ;
if (in == 0.0)
return ;
if (in < 0.0)
{ in *= -1.0 ;
negative = 1 ;
} ;
in = frexp (in, &exponent) ;
exponent += 126 ;
in *= (float) 0x1000000 ;
mantissa = (((int) in) & 0x7FFFFF) ;
if (CPU_IS_LITTLE_ENDIAN)
{ if (negative)
out [3] |= 0x80 ;
if (exponent & 0x01)
out [2] |= 0x80 ;
out [0] = mantissa & 0xFF ;
out [1] = (mantissa >> 8) & 0xFF ;
out [2] |= (mantissa >> 16) & 0x7F ;
out [3] |= (exponent >> 1) & 0x7F ;
}
else
{ if (negative)
out [0] |= 0x80 ;
if (exponent & 0x01)
out [1] |= 0x80 ;
out [3] = mantissa & 0xFF ;
out [2] = (mantissa >> 8) & 0xFF ;
out [1] |= (mantissa >> 16) & 0x7F ;
out [0] |= (exponent >> 1) & 0x7F ;
}
return ;
} /* double64_write */
/*==============================================================================================
** Private functions.
*/
static void
double64_peak_update (SF_PRIVATE *psf, double *buffer, int count, int index)
{ int chan ;
int k, position ;
float fmaxval;
for (chan = 0 ; chan < psf->sf.channels ; chan++)
{ fmaxval = fabs (buffer [chan]) ;
position = 0 ;
for (k = chan ; k < count ; k += psf->sf.channels)
if (fmaxval < fabs (buffer [k]))
{ fmaxval = fabs (buffer [k]) ;
position = k ;
} ;
if (fmaxval > psf->peak.peak[chan].value)
{ psf->peak.peak[chan].value = fmaxval ;
psf->peak.peak[chan].position = psf->write_current + index + (position /psf->sf.channels) ;
} ;
} ;
return ;
} /* double64_peak_update */
static int
double64_get_capability (void)
{ union
{ double d ;
int i [2] ;
unsigned char c [8] ;
} data ;
data.d = 1.234567890123456789 ; /* Some abitrary value. */
if (FORCE_BROKEN_FLOAT)
return (CPU_IS_LITTLE_ENDIAN) ? DOUBLE_BROKEN_LE : DOUBLE_BROKEN_BE ;
/* If this test is true ints and floats are compatible and little endian. */
if (data.i [0] == 0x428c59fb && data.i [1] == 0x3ff3c0ca &&
data.c [0] == 0xfb && data.c [2] == 0x8c && data.c [4] == 0xca && data.c [6] == 0xf3)
return DOUBLE_CAN_RW_LE ;
/* If this test is true ints and floats are compatible and big endian. */
if (data.i [0] == 0x3ff3c0ca && data.i [1] == 0x428c59fb &&
data.c [0] == 0x3f && data.c [2] == 0xc0 && data.c [4] == 0x42 && data.c [6] == 0x59)
return DOUBLE_CAN_RW_BE ;
/* Doubles are broken. Don't expect reading or writing to be fast. */
return (CPU_IS_LITTLE_ENDIAN) ? DOUBLE_BROKEN_LE : DOUBLE_BROKEN_BE ;
} /* double64_get_capability */
/*----------------------------------------------------------------------------------------------
*/
static sf_count_t
host_read_d2s (SF_PRIVATE *psf, short *ptr, sf_count_t len)
{ unsigned int readcount, thisread ;
int bytecount, bufferlen ;
int index = 0, total = 0 ;
bufferlen = SF_BUFFER_LEN - (SF_BUFFER_LEN % psf->blockwidth) ;
bytecount = len * psf->bytewidth ;
while (bytecount > 0)
{ readcount = (bytecount >= bufferlen) ? bufferlen : bytecount ;
thisread = psf_fread (psf->buffer, 1, readcount, psf->filedes) ;
if (psf->float_endswap == SF_TRUE)
endswap_long_array ((long*) psf->buffer, readcount / sizeof (int)) ;
d2s_array ((double*) (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 ;
} /* host_read_d2s */
static sf_count_t
host_read_d2i (SF_PRIVATE *psf, int *ptr, sf_count_t len)
{ unsigned int readcount, thisread ;
int bytecount, bufferlen ;
int index = 0, total = 0 ;
bufferlen = SF_BUFFER_LEN - (SF_BUFFER_LEN % psf->blockwidth) ;
bytecount = len * psf->bytewidth ;
while (bytecount > 0)
{ readcount = (bytecount >= bufferlen) ? bufferlen : bytecount ;
thisread = psf_fread (psf->buffer, 1, readcount, psf->filedes) ;
if (psf->float_endswap == SF_TRUE)
endswap_long_array ((long*) psf->buffer, readcount / sizeof (int)) ;
d2i_array ((double*) (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 ;
} /* host_read_d2i */
static sf_count_t
host_read_d2f (SF_PRIVATE *psf, float *ptr, sf_count_t len)
{ unsigned int readcount, thisread ;
int bytecount, bufferlen ;
int index = 0, total = 0 ;
bufferlen = SF_BUFFER_LEN - (SF_BUFFER_LEN % psf->blockwidth) ;
bytecount = len * psf->bytewidth ;
while (bytecount > 0)
{ readcount = (bytecount >= bufferlen) ? bufferlen : bytecount ;
thisread = psf_fread (psf->buffer, 1, readcount, psf->filedes) ;
if (psf->float_endswap == SF_TRUE)
endswap_long_array ((long*) psf->buffer, readcount / sizeof (int)) ;
d2f_array ((double*) (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 ;
} /* host_read_d2f */
static sf_count_t
host_read_d (SF_PRIVATE *psf, double *ptr, sf_count_t len)
{ unsigned int readcount, thisread ;
int bytecount, bufferlen ;
int index = 0, total = 0 ;
if (psf->float_endswap != SF_TRUE)
total = psf_fread (ptr, sizeof (double), len, psf->filedes) ;
else
{ bufferlen = SF_BUFFER_LEN - (SF_BUFFER_LEN % psf->blockwidth) ;
bytecount = len * psf->bytewidth ;
while (bytecount > 0)
{ readcount = (bytecount >= bufferlen) ? bufferlen : bytecount ;
thisread = psf_fread (psf->buffer, 1, readcount, psf->filedes) ;
endswap_long_array ((long*) psf->buffer, readcount / sizeof (int)) ;
memcpy (ptr + index, psf->buffer, thisread) ;
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 ;
} /* host_read_d */
static sf_count_t
host_write_s2d (SF_PRIVATE *psf, short *ptr, sf_count_t len)
{ unsigned int writecount, thiswrite ;
int bytecount, bufferlen ;
int index = 0, total = 0 ;
bufferlen = SF_BUFFER_LEN - (SF_BUFFER_LEN % psf->blockwidth) ;
bytecount = len * psf->bytewidth ;
while (bytecount > 0)
{ writecount = (bytecount >= bufferlen) ? bufferlen : bytecount ;
s2d_array (ptr + index, (double*) (psf->buffer), writecount / psf->bytewidth) ;
double64_peak_update (psf, (double*) (psf->buffer), writecount / psf->bytewidth, index / psf->sf.channels) ;
if (psf->float_endswap == SF_TRUE)
endswap_long_array ((long*) psf->buffer, writecount / sizeof (int)) ;
thiswrite = psf_fwrite (psf->buffer, 1, writecount, psf->filedes) ;
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 ;
} /* host_write_s2d */
static sf_count_t
host_write_i2d (SF_PRIVATE *psf, int *ptr, sf_count_t len)
{ unsigned int writecount, thiswrite ;
int bytecount, bufferlen ;
int index = 0, total = 0 ;
bufferlen = SF_BUFFER_LEN - (SF_BUFFER_LEN % psf->blockwidth) ;
bytecount = len * psf->bytewidth ;
while (bytecount > 0)
{ writecount = (bytecount >= bufferlen) ? bufferlen : bytecount ;
i2d_array (ptr + index, (double*) (psf->buffer), writecount / psf->bytewidth) ;
double64_peak_update (psf, (double*) (psf->buffer), writecount / psf->bytewidth, index / psf->sf.channels) ;
if (psf->float_endswap == SF_TRUE)
endswap_long_array ((long*) psf->buffer, writecount / sizeof (int)) ;
thiswrite = psf_fwrite (psf->buffer, 1, writecount, psf->filedes) ;
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 ;
} /* host_write_i2d */
static sf_count_t
host_write_f2d (SF_PRIVATE *psf, float *ptr, sf_count_t len)
{ unsigned int writecount, thiswrite ;
int bytecount, bufferlen ;
int index = 0, total = 0 ;
bufferlen = SF_BUFFER_LEN - (SF_BUFFER_LEN % psf->blockwidth) ;
bytecount = len * psf->bytewidth ;
while (bytecount > 0)
{ writecount = (bytecount >= bufferlen) ? bufferlen : bytecount ;
f2d_array (ptr + index, (double*) (psf->buffer), writecount / psf->bytewidth) ;
double64_peak_update (psf, (double*) (psf->buffer), writecount / psf->bytewidth, index / psf->sf.channels) ;
if (psf->float_endswap == SF_TRUE)
endswap_long_array ((long*) psf->buffer, writecount / sizeof (int)) ;
thiswrite = psf_fwrite (psf->buffer, 1, writecount, psf->filedes) ;
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 ;
} /* host_write_f2d */
static sf_count_t
host_write_d (SF_PRIVATE *psf, double *ptr, sf_count_t len)
{ unsigned int writecount, thiswrite ;
int bytecount, bufferlen ;
int index = 0, total = 0 ;
double64_peak_update (psf, ptr, len, 0) ;
if (psf->float_endswap != SF_TRUE)
total = psf_fwrite (ptr, sizeof (double), len, psf->filedes) ;
else
{ bufferlen = SF_BUFFER_LEN - (SF_BUFFER_LEN % psf->blockwidth) ;
bytecount = len * psf->bytewidth ;
while (bytecount > 0)
{ writecount = (bytecount >= bufferlen) ? bufferlen : bytecount ;
memcpy (psf->buffer, ptr + index, writecount) ;
if (psf->float_endswap == SF_TRUE)
endswap_long_array ((long*) psf->buffer, writecount / sizeof (int)) ;
thiswrite = psf_fwrite (psf->buffer, 1, writecount, psf->filedes) ;
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 ;
} /* host_write_d */
/*=======================================================================================
*/
static void
d2s_array (double *buffer, unsigned int count, short *ptr)
{ while (count)
{ count -- ;
ptr [count] = lrint (buffer [count]) ;
} ;
} /* d2s_array */
static void
d2i_array (double *buffer, unsigned int count, int *ptr)
{ while (count)
{ count -- ;
ptr [count] = lrint (buffer [count]) ;
} ;
} /* d2i_array */
static void
d2f_array (double *buffer, unsigned int count, float *ptr)
{ while (count)
{ count -- ;
ptr [count] = buffer [count] ;
} ;
} /* d2f_array */
static void
s2d_array (short *ptr, double *buffer, unsigned int count)
{ while (count)
{ count -- ;
buffer [count] = ptr [count] ;
} ;
} /* s2d_array */
static void
i2d_array (int *ptr, double *buffer, unsigned int count)
{ while (count)
{ count -- ;
buffer [count] = ptr [count] ;
} ;
} /* i2d_array */
static void
f2d_array (float *ptr, double *buffer, unsigned int count)
{ while (count)
{ count -- ;
buffer [count] = ptr [count] ;
} ;
} /* f2d_array */
/*=======================================================================================
*/