1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
|
/*
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);
}
|
