-
Notifications
You must be signed in to change notification settings - Fork 3
/
analyzerbase.cpp
190 lines (146 loc) · 4.4 KB
/
analyzerbase.cpp
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
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
/*
Copyright 2003 by Max Howell
Copyright 2009 by Martin Sandsmark
LOL GPL
*/
#include "analyzerbase.h"
#include <cmath> //interpolate()
#include <QEvent> //event()
#include <QPainter>
#include <QDebug>
#include "chunk.h"
// INSTRUCTIONS Base2D
// 1. do anything that depends on height() in init(), Base2D will call it before you are shown
// 2. otherwise you can use the constructor to initialise things
// 3. reimplement analyze(), and paint to canvas(), Base2D will update the widget when you return control to it
// 4. if you want to manipulate the scope, reimplement transform()
// 5. for convenience <vector> <qpixmap.h> <qwdiget.h> are pre-included
// TODO make an INSTRUCTIONS file
//can't mod scope in analyze you have to use transform
Analyzer::Base::Base(QWidget *parent, uint scopeSize)
: QWidget(parent)
, m_fht(new FHT(scopeSize))
{
}
void Analyzer::Base::transform(QVector<float> &scope ) //virtual
{
//this is a standard transformation that should give
//an FFT scope that has bands for pretty analyzers
//NOTE resizing here is redundant as FHT routines only calculate FHT::size() values
//scope.resize( m_fht->size() );
float *front = static_cast<float*>( &scope.front() );
float* f = new float[ m_fht->size() ];
m_fht->copy( &f[0], front );
m_fht->logSpectrum( front, &f[0] );
m_fht->scale( front, 1.0 / 20 );
scope.resize( m_fht->size() / 2 ); //second half of values are rubbish
delete [] f;
}
void Analyzer::Base::drawFrame(const Chunk &thescope)
{
if (thescope.m_dataFrames < m_fht->size())
return;
static QVector<float> scope( m_fht->size() );
for(int x = 0; x < m_fht->size(); x++)
{
scope[x] = double(((int16_t*)thescope.m_data)[x*2] >> 31);
}
transform(scope);
analyze(scope);
scope.resize( m_fht->size() );
update();
}
int Analyzer::Base::resizeExponent( int exp )
{
if ( exp < 3 )
exp = 3;
else if ( exp > 9 )
exp = 9;
if ( exp != m_fht->sizeExp() ) {
delete m_fht;
m_fht = new FHT( exp );
}
return exp;
}
int Analyzer::Base::resizeForBands(int bands)
{
int exp;
if ( bands <= 8 )
exp = 4;
else if ( bands <= 16 )
exp = 5;
else if ( bands <= 32 )
exp = 6;
else if ( bands <= 64 )
exp = 7;
else if ( bands <= 128 )
exp = 8;
else
exp = 9;
resizeExponent(exp);
return m_fht->size() / 2;
}
void Analyzer::Base::paused() //virtual
{}
void Analyzer::Base::demo() //virtual
{
static int t = 201; //FIXME make static to namespace perhaps
if( t > 999 ) t = 1; //0 = wasted calculations
if( t < 201 )
{
QVector<float> s( 32 );
const double dt = double(t) / 200;
for(int i = 0; i < s.size(); ++i)
s[i] = dt * (sin( M_PI + (i * M_PI) / s.size() ) + 1.0);
analyze(s);
}
else analyze(QVector<float>());
++t;
}
Analyzer::Base2D::Base2D(QWidget *parent, uint scopeSize)
: Base(parent, scopeSize)
{
QTimer::singleShot(0, this, SLOT(init())); // needs to know the size
}
void Analyzer::Base2D::resizeEvent(QResizeEvent *e)
{
QWidget::resizeEvent(e);
m_canvas = QPixmap(size());
m_canvas.fill(Qt::transparent);
eraseCanvas(); //this is necessary, no idea why. but I trust mxcl.
}
void Analyzer::Base2D::paintEvent(QPaintEvent*)
{
if(m_canvas.isNull())
return;
QPainter painter(this);
painter.drawPixmap(rect(), m_canvas);
}
void Analyzer::interpolate( const QVector<float> &inVec, QVector<float> &outVec ) //static
{
double pos = 0.0;
const double step = (double)inVec.size() / outVec.size();
for (int i = 0; i < outVec.size(); ++i, pos += step)
{
const double error = pos - std::floor( pos );
const unsigned long offset = (unsigned long)pos;
long indexLeft = offset + 0;
if (indexLeft >= inVec.size())
indexLeft = inVec.size() - 1;
long indexRight = offset + 1;
if (indexRight >= inVec.size())
indexRight = inVec.size() - 1;
outVec[i] = inVec[indexLeft ] * ( 1.0 - error ) +
inVec[indexRight] * error;
}
}
void Analyzer::initSin( QVector<float> &v, const uint size ) //static
{
double step = ( M_PI * 2 ) / size;
double radian = 0;
for ( uint i = 0; i < size; i++ )
{
v.push_back( sin( radian ) );
radian += step;
}
}