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Write network audio programs

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Justine Tunney 2024-09-18 17:17:02 -07:00
parent 1bfb348403
commit ce2fbf9325
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8 changed files with 366 additions and 4 deletions
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dsp/prog/loudness.h Normal file
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#ifndef COSMOPOLITAN_DSP_PROG_LOUDNESS_H_
#define COSMOPOLITAN_DSP_PROG_LOUDNESS_H_
#include <math.h>
#include <stdio.h>
#define MIN_DECIBEL -60
#define MAX_DECIBEL 0
// computes root of mean squares
static double rms(float *p, int n) {
double s = 0;
for (int i = 0; i < n; ++i)
s += p[i] * p[i];
return sqrt(s / n);
}
// converts rms to decibel
static double rms_to_db(double rms) {
double db = 20 * log10(rms);
db = fmin(db, MAX_DECIBEL);
db = fmax(db, MIN_DECIBEL);
return db;
}
// char meter[21];
// format_decibel_meter(meter, 20, rms_to_db(rms(samps, count)))
static char *format_decibel_meter(char *meter, int width, double db) {
double range = MAX_DECIBEL - MIN_DECIBEL;
int filled = (db - MIN_DECIBEL) / range * width;
for (int i = 0; i < width; ++i) {
if (i < filled) {
meter[i] = '=';
} else {
meter[i] = ' ';
}
}
meter[width] = 0;
return meter;
}
#endif /* COSMOPOLITAN_DSP_PROG_LOUDNESS_H_ */