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/* libxtract feature extraction library
*
* Copyright (C) 2006 Jamie Bullock
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*/
/* helper.c: helper functions. */
#include <config.h>
#include <stdio.h>
#include "xtract/libxtract.h"
#ifdef WORDS_BIGENDIAN
#define INDEX 0
#else
#define INDEX 1
#endif
int xtract_windowed(const float *data, const int N, const void *argv, float *result){
int n;
const float *window;
n = N;
window = (const float *)argv;
while(n--)
result[n] = data[n] * window[n];
return XTRACT_SUCCESS;
}
int xtract_features_from_subframes(const float *data, const int N, const int feature, const void *argv, float *result){
const float *frame1,
*frame2;
float *result1,
*result2;
int n, rv;
n = N >> 1;
frame1 = data;
frame2 = data + n;
result1 = result;
result2 = result + n;
rv = xtract[feature](frame1, n, argv, result1);
if(rv == XTRACT_SUCCESS)
rv = xtract[feature](frame2, n, argv, result2);
return rv;
}
inline int xtract_is_denormal(double const d){
if(sizeof(d) != 2 * sizeof(int))
fprintf(stderr, "libxtract: Error: xtract_is_denormal() detects inconsistent wordlength for type 'double'\n");
int l = ((int *)&d)[INDEX];
return (l&0x7ff00000) == 0 && d!=0; //Check for 0 may not be necessary
}
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