view src/xtract_macros_private.h @ 96:757e6f99dcd7

Dan Stowell: Removed strange "zeroing" part of xtract_mfcc() which was zeroing a load of elements despite the fact that they're ignored by the DCT process called next, and never used for anything. This was writing to an assumed large result array (same size as number of FFT bins) despite the fact that only a small number of MFCCs (typically less than 50) are required, therefore either wasting memory or writing to memory it shouldn't do!

/* 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.
 */

/** \file xtract_macros_private.h: defines useful internal macros */

#ifndef XTRACT_MACROS_PRIVATE_H
#define XTRACT_MACROS_PRIVATE_H

#include <stdio.h>

#define XTRACT_SQ(a) ((a) * (a))
#define XTRACT_MIN(a, b) ((a) < (b) ? (a) : (b))
#define XTRACT_MAX(a, b) ((a) > (b) ? (a) : (b))
#define XTRACT_NEEDS_FFTW printf("LibXtract must be compiled with fftw support to use this function.\n")
#define XTRACT_VERY_SMALL_NUMBER 2e-42
#define XTRACT_LOG_LIMIT XTRACT_VERY_SMALL_NUMBER
#define XTRACT_LOG_LIMIT_DB -96.0
#define XTRACT_DB_SCALE_OFFSET 96.0
#define XTRACT_VERY_BIG_NUMBER 2e42
#define XTRACT_SR_UPPER_LIMIT 192000.0
#define XTRACT_SR_LOWER_LIMIT 22050.0
#define XTRACT_SR_DEFAULT 44100.0
#define XTRACT_FUNDAMENTAL_DEFAULT 440.0
#define XTRACT_CHECK_nyquist if(!nyquist) nyquist = XTRACT_SR_DEFAULT / 2
#define XTRACT_CHECK_q if(!q) q = XTRACT_SR_DEFAULT / N
#define XTRACT_IS_ODD(x) (x % 2 != 0 ? 1 : 0) 
#define XTRACT_SR_LIMIT SR_UPPER_LIMIT
#define XTRACT_FFT_BANDS_MIN 16
#define XTRACT_FFT_BANDS_MAX 65536
#define XTRACT_FFT_BANDS_DEF 1024
#define XTRACT_SPEC_BW_MIN 0.168 /* Minimum spectral bandwidth \
				    (= SR_LOWER_LIMIT / FFT_BANDS_MAX*/ 
#define XTRACT_SPEC_BW_MAX 12000.0 /* SR_UPPER_LIMIT / FFT_BANDS_MIN */
#define XTRACT_SPEC_BW_DEF 43.066 /* SR_DEFAULT / FFT_BANDS_DEF */

#ifdef __cplusplus
}
#endif

#endif