server/plugins/BeatTrack.h

   1 /*
   2         SuperCollider real time audio synthesis system
   3     Copyright (c) 2002 James McCartney. All rights reserved.
   4         http://www.audiosynth.com
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
  19 */
  20
  21
  22 #define DFFRAMELENGTH 512
  23 #define DFSTORE 700
  24 //store last 700 to avoid problems during amortisation
  25 #define LAGS 128
  26
  27
  28 struct BeatTrack : Unit {
  29
  30         //corrections for different sampling rates: support 44100 as native, and 48000, 88200, 96000 by frequency domain down sampling
  31         //assumes 1024 FFT for first two, 2048 for second two
  32         float m_srate;
  33         float m_srateconversion;
  34         float m_frameperiod;
  35
  36
  37         //FFT data
  38         //int m_bufWritePos;
  39         //float * m_prepareFFTBuf;
  40         float * m_FFTBuf;
  41
  42         //fftwf_plan planTime2FFT;
  43
  44         float * m_prevmag;
  45         float * m_prevphase;
  46         float * m_predict;
  47
  48         //vDSP
  49         //unsigned long m_vlog2n;
  50         //COMPLEX_SPLIT m_vA;
  51         //FFTSetup m_vsetup;
  52
  53
  54         //time positions
  55         long m_frame;
  56
  57         //df
  58         float m_df[DFSTORE];
  59         int m_dfcounter;
  60
  61         //for peak pick scorer
  62         int m_dfmemorycounter;
  63         float m_dfmemory[15];
  64
  65
  66         //autocorrelation results on df
  67         float m_acf[DFFRAMELENGTH];
  68
  69         //float* m_M;
  70         float m_mg[LAGS];
  71         float m_besttorsum;
  72         int m_bestcolumn;
  73
  74         float m_phaseweights[LAGS];
  75
  76         float m_tor;
  77         int m_torround;
  78
  79         float m_periodp;
  80         float m_periodg;
  81
  82         int m_flagstep;
  83         float m_prevperiodp[3];
  84
  85         //amortisation search for best phase from 0 to m_torround-1
  86         float m_bestphasescore;
  87         int m_bestphase;
  88
  89         //tempo
  90         float m_currtempo;
  91
  92         //phase
  93         float m_currphase;
  94
  95         //phasor, trigger beat and modulo when >1.0
  96         float m_phase, m_phaseperblock;
  97
  98         //phasor output separate so can have it lock and keep going when don't want to track
  99         float m_outputphase, m_outputtempo, m_outputphaseperblock;
 100
 101         int halftrig;
 102     int q1trig;
 103         int q2trig;
 104
 105         //amortization - more complex structure to support different rates of work
 106         int m_amortisationstate;
 107         int m_amortcount;
 108         int m_amortlength;
 109         int m_amortisationsteps;
 110
 111         //model states
 112         int m_stateflag;
 113         int m_timesig;
 114
 115         int m_storedfcounter;
 116         int m_storedfcounterend;
 117
 118
 119 };
 120
 121
 122
 123 extern "C"
 124 {
 125         //required interface functions
 126         void BeatTrack_next(BeatTrack *unit, int wrongNumSamples);
 127         void BeatTrack_Ctor(BeatTrack *unit);
 128         void BeatTrack_Dtor(BeatTrack *unit);
 129 }
 130