forked from Mirrors/freeswitch
118 lines
2.8 KiB
C
118 lines
2.8 KiB
C
/*
|
|
** Copyright (C) 2005-2011 Erik de Castro Lopo
|
|
**
|
|
** This program is free software; you can redistribute it and/or modify
|
|
** it under the terms of the GNU General Public License as published by
|
|
** the Free Software Foundation; either version 2 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 General Public License for more details.
|
|
**
|
|
** You should have received a copy of the GNU General Public License
|
|
** along with this program; if not, write to the Free Software
|
|
** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
/*
|
|
** A simple checksum for short, int and float data.
|
|
*/
|
|
|
|
#include "sfconfig.h"
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <math.h>
|
|
|
|
#include <sndfile.h>
|
|
|
|
#include "regtest.h"
|
|
|
|
#define BIG_PRIME 999983
|
|
|
|
#define ARRAY_LEN(x) ((int) (sizeof (x)) / (sizeof ((x) [0])))
|
|
|
|
static int short_checksum (SNDFILE * file, int start) ;
|
|
static int int_checksum (SNDFILE * file, int start) ;
|
|
static int float_checksum (SNDFILE * file, int start) ;
|
|
|
|
int
|
|
calc_checksum (SNDFILE * file, const SF_INFO * info)
|
|
{ int start ;
|
|
|
|
/* Seed the checksum with data from the SF_INFO struct. */
|
|
start = info->samplerate ;
|
|
start = start * BIG_PRIME + info->channels ;
|
|
start = start * BIG_PRIME + info->format ;
|
|
|
|
switch (info->format & SF_FORMAT_SUBMASK)
|
|
{ case SF_FORMAT_FLOAT :
|
|
case SF_FORMAT_DOUBLE :
|
|
return float_checksum (file, start) ;
|
|
|
|
case SF_FORMAT_PCM_24 :
|
|
case SF_FORMAT_PCM_32 :
|
|
return int_checksum (file, start) ;
|
|
|
|
default :
|
|
return short_checksum (file, start) ;
|
|
} ;
|
|
|
|
return 0 ;
|
|
} /* calc_checksum */
|
|
|
|
/*------------------------------------------------------------------------------
|
|
*/
|
|
|
|
static union
|
|
{ short s [1 << 16] ;
|
|
int i [1 << 15] ;
|
|
float f [1 << 15] ;
|
|
} data ;
|
|
|
|
static int
|
|
short_checksum (SNDFILE * file, int start)
|
|
{ int k, count ;
|
|
|
|
do
|
|
{ count = (int) sf_read_short (file, data.s, ARRAY_LEN (data.s)) ;
|
|
for (k = 0 ; k < count ; k++)
|
|
start = start * BIG_PRIME + data.s [k] ;
|
|
}
|
|
while (count > 0) ;
|
|
|
|
return start ;
|
|
} /* short_checksum */
|
|
|
|
static int
|
|
int_checksum (SNDFILE * file, int start)
|
|
{ int k, count ;
|
|
|
|
do
|
|
{ count = (int) sf_read_int (file, data.i, ARRAY_LEN (data.i)) ;
|
|
for (k = 0 ; k < count ; k++)
|
|
start = start * BIG_PRIME + data.i [k] ;
|
|
}
|
|
while (count > 0) ;
|
|
|
|
return start ;
|
|
} /* int_checksum */
|
|
|
|
static int
|
|
float_checksum (SNDFILE * file, int start)
|
|
{ int k, count ;
|
|
|
|
do
|
|
{ count = (int) sf_read_float (file, data.f, ARRAY_LEN (data.f)) ;
|
|
for (k = 0 ; k < count ; k++)
|
|
start = start * BIG_PRIME + lrintf (0x7FFFFFFF * data.f [k]) ;
|
|
}
|
|
while (count > 0) ;
|
|
|
|
return start ;
|
|
} /* float_checksum */
|
|
|