99 lines
2.3 KiB
C++
99 lines
2.3 KiB
C++
/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
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/*
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QM DSP Library
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Centre for Digital Music, Queen Mary, University of London.
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This file copyright 2005 Nicolas Chetry, copyright 2008 QMUL.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version. See the file
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COPYING included with this distribution for more information.
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*/
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#ifndef MFCC_H
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#define MFCC_H
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#include "base/Window.h"
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class FFTReal;
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struct MFCCConfig {
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int FS;
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int fftsize;
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int nceps;
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double logpower;
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bool want_c0;
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WindowType window;
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MFCCConfig(int _FS) :
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FS(_FS), fftsize(2048), nceps(19),
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logpower(1.0), want_c0(true), window(HammingWindow) { }
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};
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class MFCC
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{
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public:
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MFCC(MFCCConfig config);
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virtual ~MFCC();
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/**
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* Process time-domain input data. inframe must contain
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* getfftlength() samples. outceps must contain space for nceps
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* values, plus one if want_c0 is specified.
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*/
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int process(const double *inframe, double *outceps);
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/**
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* Process time-domain input data. real and imag must contain
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* getfftlength()/2+1 elements (i.e. the conjugate half of the FFT
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* is not expected). outceps must contain space for nceps values,
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* plus one if want_c0 is specified.
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*/
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int process(const double *real, const double *imag, double *outceps);
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int getfftlength() const { return fftSize; }
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private:
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/* Filter bank parameters */
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double lowestFrequency;
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int linearFilters;
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double linearSpacing;
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int logFilters;
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double logSpacing;
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/* FFT length */
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int fftSize;
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int totalFilters;
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double logPower;
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/* Misc. */
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int samplingRate;
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int nceps;
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/* MFCC vector */
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double *ceps;
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double **mfccDCTMatrix;
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double **mfccFilterWeights;
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/* The analysis window */
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Window<double> *window;
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/* For the FFT */
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double *realOut;
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double *imagOut;
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double *fftMag;
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double *earMag;
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FFTReal *fft;
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/* Set if user want C0 */
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int WANT_C0;
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};
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#endif
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