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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.
*/
#ifndef XTRACT_H
#define XTRACT_H
#ifdef __cplusplus
extern "C" {
#endif
/**
* \file libxtract.h: main header file and API definition
*/
#define VERSION "0.1"
#include "xtract_scalar.h"
#include "xtract_vector.h"
#include "xtract_delta.h"
#include "xtract_types.h"
#include "xtract_macros.h"
#define XTRACT_FEATURES 40
#define LOG_LIMIT 10e-10
#define SR_LIMIT 192000
#define BARK_BANDS 26
/** \brief Enumeration of features, elements are used as indixes to an array of pointers to feature extracton functions */
enum features_ {
MEAN,
VARIANCE,
STANDARD_DEVIATION,
AVERAGE_DEVIATION,
SKEWNESS,
KURTOSIS,
IRREGULARITY_K,
IRREGULARITY_J,
TRISTIMULUS_1,
TRISTIMULUS_2,
TRISTIMULUS_3,
SMOOTHNESS,
SPREAD,
ZCR,
ROLLOFF,
LOUDNESS,
FLATNESS,
TONALITY,
CREST,
NOISINESS,
RMS_AMPLITUDE,
INHARMONICITY,
POWER,
ODD_EVEN_RATIO,
SHARPNESS,
SLOPE,
F0,
HPS,
MAGNITUDE_SPECTRUM,
AUTOCORRELATION,
AUTOCORRELATION_FFT,
AMDF,
ASDF,
MFCC,
DCT,
BARK_COEFFICIENTS,
PEAKS,
FLUX,
ATTACK_TIME,
DECAY_TIME,
DELTA_FEATURE
};
/** \brief Enumeration of feature types */
enum feature_types_ {
SCALAR,
VECTOR,
DELTA
};
/** \brief Enumeration of mfcc types */
enum mfcc_types_ {
EQUAL_GAIN,
EQUAL_AREA
};
/** \brief Enumeration of return codes */
enum return_codes_ {
SUCCESS,
MALLOC_FAILED,
BAD_ARGV,
BAD_VECTOR_SIZE
};
/**
*
* \brief An array of pointers to functions that perform the extraction
*
* \param *data: a pointer to the start of the input data (usually the first element in an array)
*
* \param N: the number of elements to be processed
*
* \param *argv: an abitrary number of additional arguments, used to pass additional parameters to the function being called
*
* \param *result: a pointer to the first element in the result
*
* Each function will iterate over N array elements, the first of which is
* pointed to by *data. It is up to the calling function to ensure that the array is in the format expected by the function being called.
*
* For scalar and delta features, *result will point to a single value.
*
* For vector features it will point to the first element in an array.
*
* Memory for this array must be allocated and freed by the calling
* function.
*
* All functions return an integer error code as descibed in the enumeration
* return_codes_
*
* example:<br>
* xtract[PEAKS](amplitude_spectrum, 512, threshold, peaks)
*/
int(*xtract[XTRACT_FEATURES])(float *data, int N, void *argv, float *result);
/** \brief A structure to store a set of n_filters Mel filters */
typedef struct xtract_mel_filter_ {
int n_filters;
float **filters;
} xtract_mel_filter;
/** \brief A function to initialise a mel filter bank
*
* It is up to the caller to pass in a pointer to memory allocated for freq_bands arrays of length N. This function populates these arrays with magnitude coefficients representing the mel filterbank on a linear scale
*/
int xtract_init_mfcc(int N, float nyquist, int style, float freq_max, float freq_min, int freq_bands, float **fft_tables);
/** \brief A function to initialise bark filter bounds
*
* A pointer to an array of BARK_BANDS ints most be passed in, and is populated with BARK_BANDS fft bin numbers representing the limits of each band
*/
int xtract_init_bark(int N, float nyquist, int *band_limits);
/* Free functions */
#ifdef __cplusplus
}
#endif
#endif
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