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/*
Copyright (C) 2006-2009 Nasca Octavian Paul
Author: Nasca Octavian Paul
This program is free software; you can redistribute it and/or modify
it under the terms of version 2 of the GNU General Public License
as published by the Free Software Foundation.
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 (version 2) for more details.
You should have received a copy of the GNU General Public License (version 2)
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef STRETCH_H
#define STRETCH_H
#include "globals.h"
#ifdef KISSFFT
#include <kiss_fftr.h>
#else
#include <fftw3.h>
#endif
enum FFTWindow{W_RECTANGULAR,W_HAMMING,W_HANN,W_BLACKMAN,W_BLACKMAN_HARRIS};
class FFT{//FFT class that considers phases as random
public:
FFT(int nsamples_);//samples must be even
~FFT();
void smp2freq();//input is smp, output is freq (phases are discarded)
void freq2smp();//input is freq,output is smp (phases are random)
void applywindow(FFTWindow type);
REALTYPE *smp;//size of samples/2
REALTYPE *freq;//size of samples
int nsamples;
private:
#ifdef KISSFFT
kiss_fftr_cfg plankfft,plankifft;
kiss_fft_scalar *datar;
kiss_fft_cpx *datac;
#else
fftwf_plan planfftw,planifftw;
REALTYPE *data;
#endif
struct{
REALTYPE *data;
FFTWindow type;
}window;
unsigned int rand_seed;
static unsigned int start_rand_seed;
};
class Stretch{
public:
Stretch(REALTYPE rap_,int in_bufsize_,FFTWindow w=W_HAMMING,bool bypass_=false,REALTYPE samplerate_=44100,int stereo_mode_=0);
//in_bufsize is also a half of a FFT buffer (in samples)
virtual ~Stretch();
void process(REALTYPE *smps,int nsmps);
// virtual void process_output(REALTYPE *smps,int nsmps){};
int in_bufsize;
int poolsize;//how many samples are inside the input_pool size (need to know how many samples to fill when seeking)
int out_bufsize;
REALTYPE *out_buf;//pot sa pun o variabila "max_out_bufsize" si asta sa fie marimea lui out_buf si pe out_bufsize sa il folosesc ca marime adaptiva
int get_nsamples(REALTYPE current_pos_percents);//how many samples are required to be added in the pool next time
int get_nsamples_for_fill();//how many samples are required to be added for a complete buffer refill (at start of the song or after seek)
void set_rap(REALTYPE newrap);//set the current stretch value
FFTWindow window_type;
protected:
virtual void process_spectrum(REALTYPE *freq){};
virtual REALTYPE get_stretch_multiplier(REALTYPE pos_percents);
REALTYPE samplerate;
int stereo_mode;//0=mono,1=left,2=right
private:
REALTYPE *in_pool;//de marimea in_bufsize
REALTYPE rap;
REALTYPE *old_out_smp_buf;
FFT *infft,*outfft;
double remained_samples;//how many fraction of samples has remained (0..1)
bool bypass;
};
#endif
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