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/***************************************************************************
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* Copyright (C) 2005 by Olivier Goffart *
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* ogoffart@kde.org *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
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***************************************************************************/
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#include "voicesignature.h"
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#include "sound.h"
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#include <kconfig.h>
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#include <math.h>
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#ifdef PI
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#undef PI
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#endif
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#define PI (2.0 * asin(1.0))
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#include <kdebug.h>
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#include <tqdatetime.h>
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#undef Complex
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namespace KHotKeys
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{
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inline static float ABS(float X)
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{
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return (X>0) ? X : -X ;
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}
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inline static int MAX(int X , int Y)
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{
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return (X>Y) ? X : Y ;
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}
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inline static int MIN(int X , int Y)
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{
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return (X<Y) ? X : Y ;
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}
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class Complex
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{
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public:
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Complex () {}
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Complex (double re): _re(re), _im(0.0) {}
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Complex (double re, double im): _re(re), _im(im) {}
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double Re () const { return _re; }
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double Im () const { return _im; }
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void operator += (const Complex& c)
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{
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_re += c._re;
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_im += c._im;
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}
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void operator -= (const Complex& c)
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{
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_re -= c._re;
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_im -= c._im;
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}
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void operator *= (const Complex& c)
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{
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double reT = c._re * _re - c._im * _im;
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_im = c._re * _im + c._im * _re;
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_re = reT;
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}
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Complex operator- ()
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{
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return Complex (-_re, -_im);
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}
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Complex operator- (const Complex& c) const
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{
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return Complex (_re - c._re, _im - c._im);
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}
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Complex operator+ (const Complex& c) const
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{
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return Complex (_re + c._re, _im + c._im);
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}
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Complex operator* (const Complex& c) const
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{
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return Complex (_re * c._re - _im * c._im , _im * c._re + _re * c._im);
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}
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double Mod () const { return sqrt (_re * _re + _im * _im); }
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static Complex fromExp(double mod, double arg) { return Complex(mod*cos(arg) , mod*sin(arg)); }
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private:
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double _re;
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double _im;
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};
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static inline double hamming(uint n, uint size)
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{
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return HAMMING ? 0.54-0.46*cos( 2*PI*n /(size-1) ) : 1;
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}
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static TQMemArray<double> fft(const Sound& sound, unsigned int start, unsigned int stop)
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{
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if(start>=stop || sound.size() == 0)
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return TQMemArray<double>();
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//We need a sample with a size of a power of two
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uint size=stop-start;
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unsigned short log2size=0;
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while( (1<<log2size) < size )
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log2size++;
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int diff=(1<<log2size) - size;
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if(diff > size/4 || 1<<log2size > sound.size() )
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{
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log2size--;
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diff=(1<<log2size) - size;
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}
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size=1<<log2size;
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int start2=start-diff/2;
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int stop2=start2+ size;
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if(start2<0)
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{
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stop2-=start2;
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start2=0;
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}
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if(stop2>sound.size())
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{
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start2-= stop2 - sound.size();
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stop2=sound.size();
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if(start2<0)
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{
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stop2-=start2;
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start2=0;
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}
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}
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//Generate an array to work in
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TQMemArray<Complex> samples(size);
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//Fill it with samples in the "reversed carry" order
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int rev_carry = 0;
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for (uint f = 0; f < size - 1; f++)
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{
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samples[f]=sound.at(start2+rev_carry)* hamming(rev_carry, size);
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// KDEBUG(rev_carry);
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int mask = size>>1; // N / 2
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// add 1 backwards
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while (rev_carry >= mask)
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{
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rev_carry -= mask; // turn off this bit
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mask >>= 1;
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}
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rev_carry += mask;
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}
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samples[size-1]=sound.at(start2+size-1)*hamming(size-1, size);
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//FFT
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for(uint level=0; level < log2size; level++)
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{
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for( int k=0; k< (size>>1) ; k++)
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{
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uint indice1 = (k << (level+1) ) % (size-1); // (k*2*2^l)%(N-1)
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uint indice2 = indice1 + (1<<level); // (k*2*2^l)%(N-1) + 2^l
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uint coefW = ( k << (level+1) ) / (size-1); // (k*2*2^l) div (N-1)
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double Wexpn=-2 * PI * coefW / (2 << level); // -2 pi n / 2^(l+1)
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Complex W=Complex::fromExp(1, Wexpn) ;
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//OPERATION BUTTERFLY
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Complex a=samples[indice1];
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Complex b=samples[indice2];
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samples[indice1]=a+W*b;
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samples[indice2]=a-W*b;
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// kdDebug() << k_funcinfo << "PAPILLON s_" << indice1 << " s_" << indice2 << " W_" << (2<<level) << "^" << coefW << endl;
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}
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}
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TQMemArray<double> result(size);
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for(uint f=0;f<size;f++)
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{
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result[f]=samples[f].Mod() / size;
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}
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return result;
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}
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TQMemArray<double> VoiceSignature::fft(const Sound& sound, unsigned int start, unsigned int stop)
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{
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return KHotKeys::fft(sound, start, stop);
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/*TQMemArray<double> result(8000);
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for(int f=0; f<8000;f++)
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{
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Complex c(0);
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for(uint x=start; x<stop; x++)
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{
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Complex s(sound.at(x));
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double angle=-2*PI*f*x/8000;
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s*= Complex( cos(angle) , sin(angle) );
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c+=s;
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}
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result[f]= c.Mod()/(stop-start) ;
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}
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return result;*/
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}
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bool VoiceSignature::window(const Sound& sound, unsigned int *_start, unsigned int *_stop)
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{
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bool isNoise=false;
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unsigned int length=sound.size();
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uint unit=WINDOW_UNIT;
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if(length < unit )
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return false;
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//Fen<65>trage
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unsigned int start=0 , stop=0;
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double moy=0;
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for(uint x=0;x<unit;x++)
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{
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moy+=ABS(sound.at(x));
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}
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if(moy>WINDOW_MINIMUM*unit)
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isNoise=true;
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for(uint x=unit; x<length; x++)
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{
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if(moy<WINDOW_MINIMUM*unit)
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{
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if(stop==0)
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start=x-unit/2;
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}
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else
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stop=x-unit/2;
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moy+=ABS(sound.at(x));
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moy-=ABS(sound.at(x-unit));
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}
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if(moy>WINDOW_MINIMUM*unit && isNoise)
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return false;
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stop=MIN(length,stop+WINDOW_MINIMUM_ECART);
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start=MAX(0 ,start-WINDOW_MINIMUM_ECART);
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if(_start)
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*_start=start;
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if(_stop)
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*_stop=stop;
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return start<stop;
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}
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//finally doesn't give better results
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/*#define HZ_TO_MEL(F) (1127*log(1+(F)/700.0))
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#define MEL_TO_HZ(M) ( ( exp((M)/1127.0) -1) *700 )*/
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#define HZ_TO_MEL(F) (F)
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#define MEL_TO_HZ(F) (F)
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VoiceSignature::VoiceSignature(const Sound& sound)
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{
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static uint temp_wind=0, temp_fft=0, temp_moy=0;
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TQTime t;
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t.start();
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unsigned int start , stop;
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if(!window(sound,&start,&stop))
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{
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kdWarning( 1217 ) << k_funcinfo << "No voice found in the sound" << endl ;
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return;
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}
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temp_wind+=t.restart();
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uint length=stop-start;
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for(int wind=0; wind<WINDOW_NUMBER; wind++)
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{
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unsigned int w_start=MAX(start, start+ (int)((wind - WINDOW_SUPER)*length/WINDOW_NUMBER));
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unsigned int w_stop =MIN(stop , start+ (int)((wind+1.0+WINDOW_SUPER)*length/WINDOW_NUMBER));
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TQMemArray<double> fourrier=fft(sound, w_start,w_stop);
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temp_fft+=t.restart();
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//MEL conversion
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double mel_start=HZ_TO_MEL(FFT_RANGE_INF);
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uint mel_stop=HZ_TO_MEL(FFT_RANGE_SUP);
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for(int four=0; four<FOUR_NUMBER; four++)
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{
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unsigned int wf_start=mel_start + four*(mel_stop-mel_start)/FOUR_NUMBER;
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unsigned int wf_stop=mel_start + (four+1)*(mel_stop-mel_start)/FOUR_NUMBER;
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unsigned int f_start=MEL_TO_HZ( wf_start )*fourrier.size()/sound.fs();
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unsigned int f_stop=MEL_TO_HZ( wf_stop )*fourrier.size()/sound.fs();
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unsigned int f_size=f_stop-f_start;
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double nb=0;
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for(uint f=f_start; f<f_stop; f++)
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{
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int freq=f*fourrier.size()/sound.fs();
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nb+=fourrier[f]*FFT_PONDERATION(freq);
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}
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nb/=(f_size);
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data[wind][four]=nb;
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}
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temp_moy+=t.restart();
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}
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// kdDebug( 1217 ) << k_funcinfo << "wind: "<< temp_wind << " - fft: " << temp_fft << " - moy: " << temp_moy << endl;
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}
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VoiceSignature::~VoiceSignature()
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{
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}
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float VoiceSignature::diff(const VoiceSignature &s1, const VoiceSignature &s2)
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{
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if(s1.isNull() || s2.isNull())
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return 1000000;
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#if 0
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double result=0;
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for(int x=0;x<WINDOW_NUMBER;x++)
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for(int y=0;y<FOUR_NUMBER;y++)
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{
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double d1=s1.data[x][y]-s2.data[x][y];
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result+= d1*d1;//*pond[x][y];
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}
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return result;
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#endif
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//DTW
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// http://tcts.fpms.ac.be/cours/1005-08/speech/projects/2001/delfabro_henry_poitoux/
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const int I=WINDOW_NUMBER;
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const int J=WINDOW_NUMBER;
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double g[I+1][J+1];
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for(int f=1;f<=J;f++)
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g[0][f]=10000000;
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for(int f=1;f<=I;f++)
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g[f][0]=10000000;
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g[0][0]=0;
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for(int i=1;i<=I;i++)
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for(int j=1;j<=J;j++)
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{
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double d=0;
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for(int f=0;f<FOUR_NUMBER;f++)
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{
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double d1=s1.data[i-1][f]-s2.data[j-1][f];
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d+= d1*d1;//*pond[x][y];
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}
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d=sqrt(d);
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g[i][j]=QMIN(QMIN( g[i-1][j]+d, g[i][j-1]+d ) , g[i-1][j-1]+d+d );
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}
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return g[I][J]/(I+J);
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}
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int VoiceSignature::size1()
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{
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return WINDOW_NUMBER;
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}
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int VoiceSignature::size2()
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{
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return FOUR_NUMBER;
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}
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TQMap<int, TQMap<int, double> > VoiceSignature::pond;
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void VoiceSignature::write(KConfigBase *cfg, const TQString &key) const
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{
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TQStringList sl;
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for(int x=0;x<WINDOW_NUMBER;x++)
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for(int y=0;y<FOUR_NUMBER;y++)
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{
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sl.append( TQString::number(data[x][y]) );
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}
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cfg->writeEntry(key,sl);
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}
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void VoiceSignature::read(KConfigBase *cfg, const TQString &key)
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{
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TQStringList sl=cfg->readListEntry(key);
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for(int x=0;x<WINDOW_NUMBER;x++)
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for(int y=0;y<FOUR_NUMBER;y++)
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{
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data[x][y]= sl[x*FOUR_NUMBER+y].toDouble();
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}
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}
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}
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