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
|
#include "utils.h"
#include <unistd.h>
#include <stdint.h>
#include <math.h>
/* Taken from sox */
const char* level(int channel, int* peak)
{
static char const * const text[][2] = {
/* White: 2dB steps */
{"", ""}, {"-", "-"}, {"=", "="}, {"-=", "=-"},
{"==", "=="}, {"-==", "==-"}, {"===", "==="}, {"-===", "===-"},
{"====", "===="}, {"-====", "====-"}, {"=====", "====="},
{"-=====", "=====-"}, {"======", "======"},
/* Red: 1dB steps */
{"!=====", "=====!"},
};
int const red = 1, white = NUMOF(text) - red;
double linear = (double)(*peak) / INT16_MAX;
int vu_dB = linear ? floor(2 * white + red + linear_to_dB(linear)) : 0;
int index = vu_dB < 2 * white ?
MAX(vu_dB / 2, 0) :
MIN(vu_dB - white, red + white - 1);
*peak = 0;
return text[index][channel];
}
|
