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
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <math.h>
#include <qwidget.h>
#include "sound.h"
#include "fft.moc"
#include <X11/Xlib.h>
extern "C" {
#include "soundfft.h"
}
#define FFT_MAX 8192
#define FFT_LEFT 100
#define FFT_RIGHT 10000
#define DB_MAX 0.0
#define DB_MIN -100.0
/* ---------------------------------------------------------------------- */
FFTWindow::FFTWindow(QWidget *parent, char *name) : QWidget(parent,name,0)
{
XColor color,dummy;
Colormap map = DefaultColormapOfScreen
(DefaultScreenOfDisplay(x11Display()));
gc = XCreateGC(x11Display(),winId(),0,NULL);
XAllocNamedColor(x11Display(),map,"white",&color,&dummy);
back = color.pixel;
XAllocNamedColor(x11Display(),map,"red",&color,&dummy);
fore = color.pixel;
/* flag: no init so far... */
channels = 0;
logmap = NULL;
ylog = false;
}
void
FFTWindow::make_logmap()
{
int i,w,h;
float freq,up;
w = width();
h = height();
if (!w || !h || !channels)
return;
if (logmap) {
free(logmap);
free(segments);
free(buffer);
EndFFT();
}
logmap = (int*) malloc((w+1)*sizeof(int));
segments = (XSegment*)malloc((w)*sizeof(XSegment));
buffer = (short*)malloc(fft_size*sizeof(short)*channels);
InitializeFFT(fft_size);
up = log(FFT_RIGHT/FFT_LEFT)/log(2);
for (i = 0; i <= w; i++) {
freq = pow(2,up*i/w)* FFT_LEFT;
logmap[i] = (int)(fft_size*freq/rate);
}
for (i = 0; i < w; i++) {
segments[i].x1 = i;
segments[i].x2 = i;
segments[i].y2 = h;
}
}
void
FFTWindow::calculate(unsigned char *data)
{
int i,j;
if (NULL == logmap) {
fprintf(stderr,"Oops: fft no logmap (yet)\n");
return;
}
switch (afmt) {
case FMT_8BIT:
for (i = 0; i < audio_size; i++)
buffer[i] = (data[i] ^ 0x80) << 8;
break;
#if 0
case AFMT_S8:
for (i = 0; i < audio_size; i++)
buffer[i] = data[i] << 8;
break;
#endif
case FMT_16BIT:
memcpy(buffer,data,audio_size);
#if 0
/* byte swap */
for (i = 0; i < fft_size; i++)
buffer[i] =
((buffer[i] & 0xff00) >> 8) |
((buffer[i] & 0x00ff) << 8);
/* unsigned -> signed */
if (afmt == AFMT_U16_LE || afmt == AFMT_U16_BE)
for (i = 0; i < fft_size; i++)
buffer[i] ^= 0x8000;
#endif
break;
default:
fprintf(stderr,"oops(fft): unknown sound format\n");
exit(1);
}
for (i = 0, lmax = 0; i < fft_size; i++)
if ((j = abs((signed short)buffer[i])) > lmax)
lmax = j;
if (channels == 2) {
for (i = 0, j = 0; i < fft_size; i++, j+=2)
buffer[i] = (buffer[j]+buffer[j+1])>>1;
}
RealFFT(buffer);
}
void
FFTWindow::drawhist()
{
XGCValues gcval;
int re,im,ab;
int i,j,max,w,h;
int len = fft_size>>1;
w = width();
h = height();
for (i = 0; i < w; i++) {
max = 0;
j = logmap[i];
do {
if (j >= len)
break;
re = buffer[BitReversed[j]];
im = buffer[BitReversed[j]+1];
ab = re*re+im*im;
if (ab > max)
max = ab;
j++;
} while (j < logmap[i+1]);
if (ylog) {
float dBVal = 20 * log10( sqrt(max)/FFT_MAX );
max = (int)( h * ( dBVal-DB_MIN )/( DB_MAX-DB_MIN ));
} else {
max = (int)(sqrt(max) * h / FFT_MAX);
}
segments[i].y1 = h-max;
}
gcval.foreground = back;
XChangeGC(x11Display(),gc,GCForeground,&gcval);
XFillRectangle(x11Display(),winId(),gc,0,0,width(),height());
gcval.foreground = fore;
XChangeGC(x11Display(),gc,GCForeground,&gcval);
XDrawSegments(x11Display(),winId(),gc,segments,w);
if (ylog) {
float dBVal = 20 * log10( (double)lmax/32768 );
max = h - (int)( h * ( dBVal-DB_MIN )/( DB_MAX-DB_MIN ));
} else {
max = height() - lmax*height()/32768;
}
XDrawLine(x11Display(),winId(),gc,0,max,width(),max);
}
/* ---------------------------------------------------------------------- */
void
FFTWindow::resizeEvent(QResizeEvent *event)
{
make_logmap();
}
void
FFTWindow::new_params(struct SOUNDPARAMS *p)
{
afmt = p->format;
channels = p->channels;
rate = p->rate;
audio_size = p->blocksize;
fft_size = audio_size/channels/2;
if (afmt != FMT_16BIT)
fft_size *= 2;
make_logmap();
}
void
FFTWindow::new_data(void *data)
{
if (!channels || !isVisible())
return;
calculate((unsigned char*)data);
drawhist();
}
void
FFTWindow::set_ylog(int linear)
{
ylog = (linear==0);
drawhist();
}
|
