384 lines
10 KiB
C++
384 lines
10 KiB
C++
/*
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Copyright (C) 2006-2011 Nasca Octavian Paul
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Author: Nasca Octavian Paul
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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 version 2 of the GNU General Public License
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as published by the Free Software Foundation.
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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 (version 2) for more details.
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You should have received a copy of the GNU General Public License (version 2)
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "Stretch.h"
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#include <stdlib.h>
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#include <math.h>
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FFT::FFT(int nsamples_, bool no_inverse)
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{
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nsamples=nsamples_;
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if (nsamples%2!=0) {
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nsamples+=1;
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Logger::writeToLog("WARNING: Odd sample size on FFT::FFT() "+String(nsamples));
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};
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smp.resize(nsamples);
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for (int i = 0; i < nsamples; i++)
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smp[i] = 0.0;
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freq.resize(nsamples/2+1);
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for (int i=0;i<nsamples/2+1;i++)
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freq[i]=0.0;
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window.data.resize(nsamples);
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for (int i=0;i<nsamples;i++)
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window.data[i]=0.707f;
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window.type=W_RECTANGULAR;
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data.resize(nsamples,true);
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bool allow_long_planning = false; // g_propsfile->getBoolValue("fftw_allow_long_planning", false);
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//double t0 = Time::getMillisecondCounterHiRes();
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if (allow_long_planning)
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{
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//fftwf_plan_with_nthreads(2);
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planfftw=fftwf_plan_r2r_1d(nsamples,data.data(),data.data(),FFTW_R2HC,FFTW_MEASURE);
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if (no_inverse == false)
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planifftw=fftwf_plan_r2r_1d(nsamples,data.data(),data.data(),FFTW_HC2R,FFTW_MEASURE);
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} else
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{
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//fftwf_plan_with_nthreads(2);
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planfftw=fftwf_plan_r2r_1d(nsamples,data.data(),data.data(),FFTW_R2HC,FFTW_ESTIMATE);
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//fftwf_plan_with_nthreads(2);
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if (no_inverse == false)
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planifftw=fftwf_plan_r2r_1d(nsamples,data.data(),data.data(),FFTW_HC2R,FFTW_ESTIMATE);
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}
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//double t1 = Time::getMillisecondCounterHiRes();
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//Logger::writeToLog("Creating FFTW3 plans took "+String(t1-t0)+ "ms");
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static int seed = 0;
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m_randgen = std::mt19937(seed);
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++seed;
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};
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FFT::~FFT()
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{
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fftwf_destroy_plan(planfftw);
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if (planifftw!=nullptr)
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fftwf_destroy_plan(planifftw);
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};
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void FFT::smp2freq()
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{
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for (int i=0;i<nsamples;i++)
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data[i]=smp[i];
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fftwf_execute(planfftw);
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for (int i=1;i<nsamples/2;i++)
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{
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REALTYPE c=data[i];
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REALTYPE s=data[nsamples-i];
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freq[i]=sqrt(c*c+s*s);
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};
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freq[0]=0.0;
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};
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void FFT::freq2smp()
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{
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REALTYPE inv_2p15_2pi=1.0f/16384.0f*(float)c_PI;
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for (int i=1;i<nsamples/2;i++)
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{
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unsigned int rand = m_randdist(m_randgen);
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REALTYPE phase=rand*inv_2p15_2pi;
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data[i]=freq[i]*cos(phase);
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data[nsamples-i]=freq[i]*sin(phase);
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};
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data[0]=data[nsamples/2+1]=data[nsamples/2]=0.0;
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fftwf_execute(planifftw);
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for (int i=0;i<nsamples;i++)
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smp[i]=data[i]/nsamples;
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};
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void FFT::applywindow(FFTWindow type)
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{
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if (window.type!=type){
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window.type=type;
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switch (type){
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case W_RECTANGULAR:
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for (int i=0;i<nsamples;i++) window.data[i]=0.707f;
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break;
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case W_HAMMING:
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for (int i=0;i<nsamples;i++) window.data[i]=(float)(0.53836-0.46164*cos(2.0*c_PI*i/(nsamples+1.0)));
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break;
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case W_HANN:
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for (int i=0;i<nsamples;i++) window.data[i]=(float)(0.5*(1.0-cos(2*c_PI*i/(nsamples-1.0))));
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break;
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case W_BLACKMAN:
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for (int i=0;i<nsamples;i++) window.data[i]=(float)(0.42-0.5*cos(2*c_PI*i/(nsamples-1.0))+0.08*cos(4*c_PI*i/(nsamples-1.0)));
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break;
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case W_BLACKMAN_HARRIS:
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for (int i=0;i<nsamples;i++) window.data[i]=(float)(0.35875-0.48829*cos(2*c_PI*i/(nsamples-1.0))+0.14128*cos(4*c_PI*i/(nsamples-1.0))-0.01168*cos(6*c_PI*i/(nsamples-1.0)));
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break;
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};
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};
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for (int i=0;i<nsamples;i++) smp[i]*=window.data[i];
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};
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/*******************************************/
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Stretch::Stretch(REALTYPE rap_,int /*bufsize_*/,FFTWindow w,bool bypass_,REALTYPE samplerate_,int /*stereo_mode_*/)
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{
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freezing=false;
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onset_detection_sensitivity=0.0;
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samplerate=samplerate_;
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rap=rap_;
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bypass = bypass_;
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remained_samples=0.0;
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window_type=w;
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require_new_buffer=false;
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c_pos_percents=0.0;
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extra_onset_time_credit=0.0;
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skip_samples=0;
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};
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Stretch::~Stretch()
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{
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};
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void Stretch::set_rap(REALTYPE newrap){
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//if ((rap>=1.0)&&(newrap>=1.0))
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rap=newrap;
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};
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void Stretch::do_analyse_inbuf(REALTYPE *smps){
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//get the frequencies
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for (int i=0;i<bufsize;i++) {
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infft->smp[i]=old_smps[i];
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infft->smp[i+bufsize]=smps[i];
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old_freq[i]=infft->freq[i];
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};
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infft->applywindow(window_type);
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infft->smp2freq();
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};
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void Stretch::do_next_inbuf_smps(REALTYPE *smps){
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for (int i=0;i<bufsize;i++) {
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very_old_smps[i]=old_smps[i];
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old_smps[i]=new_smps[i];
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new_smps[i]=smps[i];
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};
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};
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REALTYPE Stretch::do_detect_onset(){
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REALTYPE result=0.0;
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if (onset_detection_sensitivity>1e-3){
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REALTYPE os=0.0,osinc=0.0;
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REALTYPE osincold=1e-5f;
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int maxk=1+(int)(bufsize*500.0/(samplerate*0.5));
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int k=0;
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for (int i=0;i<bufsize;i++) {
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osinc+=infft->freq[i]-old_freq[i];
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osincold+=old_freq[i];
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if (k>=maxk) {
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k=0;
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os+=osinc/osincold;
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osinc=0;
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};
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k++;
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};
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os+=osinc;
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if (os<0.0) os=0.0;
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//if (os>1.0) os=1.0;
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REALTYPE os_strength=(float)(pow(20.0,1.0-onset_detection_sensitivity)-1.0);
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REALTYPE os_strength_h=os_strength*0.75f;
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if (os>os_strength_h){
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result=(os-os_strength_h)/(os_strength-os_strength_h);
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if (result>1.0f) result=1.0f;
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};
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if (result>1.0f) result=1.0f;
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};
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return result;
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};
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void Stretch::setBufferSize(int bufsize_)
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{
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if (bufsize == 0 || bufsize_ != bufsize)
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{
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bufsize = bufsize_;
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if (bufsize < 8) bufsize = 8;
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out_buf = floatvector(bufsize);
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old_freq = floatvector(bufsize);
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very_old_smps = floatvector(bufsize);
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new_smps = floatvector(bufsize);
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old_smps = floatvector(bufsize);
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old_out_smps = floatvector(bufsize * 2);
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infft = std::make_unique<FFT>(bufsize * 2);
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fft = std::make_unique<FFT>(bufsize * 2);
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outfft = std::make_unique<FFT>(bufsize * 2);
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}
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jassert(infft != nullptr && fft != nullptr && outfft != nullptr);
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fill_container(outfft->smp, 0.0f);
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for (int i = 0; i<bufsize * 2; i++) {
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old_out_smps[i] = 0.0;
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};
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for (int i = 0; i<bufsize; i++) {
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old_freq[i] = 0.0f;
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new_smps[i] = 0.0f;
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old_smps[i] = 0.0f;
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very_old_smps[i] = 0.0f;
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};
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}
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REALTYPE Stretch::process(REALTYPE *smps,int nsmps)
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{
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jassert(bufsize > 0);
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REALTYPE onset=0.0;
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if (bypass){
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for (int i=0;i<bufsize;i++) out_buf[i]=smps[i];
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return 0.0;
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};
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if (smps!=NULL){
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if ((nsmps!=0)&&(nsmps!=bufsize)&&(nsmps!=get_max_bufsize())){
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printf("Warning wrong nsmps on Stretch::process() %d,%d\n",nsmps,bufsize);
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return 0.0;
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};
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if (nsmps!=0){//new data arrived: update the frequency components
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do_analyse_inbuf(smps);
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if (nsmps==get_max_bufsize()) {
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for (int k=bufsize;k<get_max_bufsize();k+=bufsize) do_analyse_inbuf(smps+k);
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};
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if (onset_detection_sensitivity>1e-3) onset=do_detect_onset();
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};
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//move the buffers
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if (nsmps!=0){//new data arrived: update the frequency components
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do_next_inbuf_smps(smps);
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if (nsmps==get_max_bufsize()) {
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for (int k=bufsize;k<get_max_bufsize();k+=bufsize) do_next_inbuf_smps(smps+k);
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};
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};
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//construct the input fft
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int start_pos=(int)(floor(remained_samples*bufsize));
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if (start_pos>=bufsize) start_pos=bufsize-1;
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for (int i=0;i<bufsize-start_pos;i++) fft->smp[i]=very_old_smps[i+start_pos];
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for (int i=0;i<bufsize;i++) fft->smp[i+bufsize-start_pos]=old_smps[i];
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for (int i=0;i<start_pos;i++) fft->smp[i+2*bufsize-start_pos]=new_smps[i];
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//compute the output spectrum
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fft->applywindow(window_type);
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fft->smp2freq();
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for (int i=0;i<bufsize;i++) outfft->freq[i]=fft->freq[i];
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//for (int i=0;i<bufsize;i++) outfft->freq[i]=infft->freq[i]*remained_samples+old_freq[i]*(1.0-remained_samples);
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process_spectrum(outfft->freq.data());
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outfft->freq2smp();
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//make the output buffer
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REALTYPE tmp=(float)(1.0/(float) bufsize*c_PI);
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REALTYPE hinv_sqrt2=0.853553390593f;//(1.0+1.0/sqrt(2))*0.5;
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REALTYPE ampfactor=2.0f;
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//remove the resulted unwanted amplitude modulation (caused by the interference of N and N+1 windowed buffer and compute the output buffer
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for (int i=0;i<bufsize;i++) {
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REALTYPE a=(float)((0.5+0.5*cos(i*tmp)));
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REALTYPE out=(float)(outfft->smp[i+bufsize]*(1.0-a)+old_out_smps[i]*a);
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out_buf[i]=(float)(out*(hinv_sqrt2-(1.0-hinv_sqrt2)*cos(i*2.0*tmp))*ampfactor);
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};
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//copy the current output buffer to old buffer
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for (int i=0;i<bufsize*2;i++) old_out_smps[i]=outfft->smp[i];
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};
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if (!freezing){
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long double used_rap=rap*get_stretch_multiplier(c_pos_percents);
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long double r=1.0/used_rap;
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if (extra_onset_time_credit>0){
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REALTYPE credit_get=(float)(0.5*r);//must be smaller than r
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extra_onset_time_credit-=credit_get;
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if (extra_onset_time_credit<0.0) extra_onset_time_credit=0.0;
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r-=credit_get;
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};
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//long double old_remained_samples_test=remained_samples;
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remained_samples+=r;
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//int result=0;
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if (remained_samples>=1.0){
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skip_samples=(int)(floor(remained_samples-1.0)*bufsize);
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remained_samples=remained_samples-floor(remained_samples);
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require_new_buffer=true;
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}else{
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require_new_buffer=false;
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};
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};
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// long double rf_test=remained_samples-old_remained_samples_test;//this value should be almost like "rf" (for most of the time with the exception of changing the "ri" value) for extremely long stretches (otherwise the shown stretch value is not accurate)
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//for stretch up to 10^18x "long double" must have at least 64 bits in the fraction part (true for gcc compiler on x86 and macosx)
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return onset;
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};
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void Stretch::set_onset_detection_sensitivity(REALTYPE detection_sensitivity)
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{
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onset_detection_sensitivity = detection_sensitivity;
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if (detection_sensitivity<1e-3) extra_onset_time_credit = 0.0;
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}
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void Stretch::here_is_onset(REALTYPE onset){
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if (freezing) return;
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if (onset>0.5){
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require_new_buffer=true;
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extra_onset_time_credit+=1.0-remained_samples;
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remained_samples=0.0;
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skip_samples=0;
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};
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};
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int Stretch::get_nsamples(REALTYPE current_pos_percents){
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if (bypass) return bufsize;
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if (freezing) return 0;
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c_pos_percents=current_pos_percents;
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return require_new_buffer?bufsize:0;
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};
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int Stretch::get_nsamples_for_fill(){
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return get_max_bufsize();
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};
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int Stretch::get_skip_nsamples(){
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if (freezing||bypass) return 0;
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return skip_samples;
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};
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REALTYPE Stretch::get_stretch_multiplier(REALTYPE /*pos_percents*/){
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return 1.0;
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};
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