view xtract/xtract_delta.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_delta.h: declares functions that extract a feature as a single value or vector from more than one input vector */

#ifndef XTRACT_DELTA_H
#define XTRACT_DELTA_H

#ifdef __cplusplus
extern "C" {
#endif

#include "xtract_types.h"

/* \brief Extract spectral flux as defined by Gaël Richard (2006)*/
int xtract_flux(const float *data, const int N, const void *argv , float *result);
/*xtract_frame_tracker *xf */

/** \brief Extract attack Time */
int xtract_attack_time(const float *data, const int N, const void *argv , float *result);
/* xtract_amp_tracker *xa */

/** Extract temporal decrease */
int xtract_decay_time(const float *data, const int N, const void *argv, float *result);
/* xtract_amp_tracker *xa */


/** \brief A generic function to calculate the delta of a feature over a given period (in frames) */
int xtract_delta_feature(const float *data, const int N, const void *argv, float *result);
/*xtract_frame_tracker *xf */
/*float frames*/



#ifdef __cplusplus
}
#endif

#endif