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/*
SuperCollider real time audio synthesis system
Copyright (c) 2002 James McCartney. All rights reserved.
http://www.audiosynth.com
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
*/
#define DFFRAMELENGTH 512
#define DFSTORE 700
//store last 700 to avoid problems during amortisation
#define LAGS 128
struct BeatTrack : Unit {
//corrections for different sampling rates: support 44100 as native, and 48000, 88200, 96000 by frequency domain down sampling
//assumes 1024 FFT for first two, 2048 for second two
float m_srate;
float m_srateconversion;
float m_frameperiod;
//FFT data
//int m_bufWritePos;
//float * m_prepareFFTBuf;
float * m_FFTBuf;
//fftwf_plan planTime2FFT;
float * m_prevmag;
float * m_prevphase;
float * m_predict;
//vDSP
//unsigned long m_vlog2n;
//COMPLEX_SPLIT m_vA;
//FFTSetup m_vsetup;
//time positions
long m_frame;
//df
float m_df[DFSTORE];
int m_dfcounter;
//for peak pick scorer
int m_dfmemorycounter;
float m_dfmemory[15];
//autocorrelation results on df
float m_acf[DFFRAMELENGTH];
//float* m_M;
float m_mg[LAGS];
float m_besttorsum;
int m_bestcolumn;
float m_phaseweights[LAGS];
float m_tor;
int m_torround;
float m_periodp;
float m_periodg;
int m_flagstep;
float m_prevperiodp[3];
//amortisation search for best phase from 0 to m_torround-1
float m_bestphasescore;
int m_bestphase;
//tempo
float m_currtempo;
//phase
float m_currphase;
//phasor, trigger beat and modulo when >1.0
float m_phase, m_phaseperblock;
//phasor output separate so can have it lock and keep going when don't want to track
float m_outputphase, m_outputtempo, m_outputphaseperblock;
int halftrig;
int q1trig;
int q2trig;
//amortization - more complex structure to support different rates of work
int m_amortisationstate;
int m_amortcount;
int m_amortlength;
int m_amortisationsteps;
//model states
int m_stateflag;
int m_timesig;
int m_storedfcounter;
int m_storedfcounterend;
};
extern "C"
{
//required interface functions
void BeatTrack_next(BeatTrack *unit, int wrongNumSamples);
void BeatTrack_Ctor(BeatTrack *unit);
void BeatTrack_Dtor(BeatTrack *unit);
}
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