mirror of
https://github.com/cookiengineer/audacity
synced 2025-06-16 16:10:06 +02:00
36 lines
604 B
C
36 lines
604 B
C
#ifndef _RMS_H
|
|
#define _RMS_H
|
|
|
|
#include <math.h>
|
|
|
|
#define RMS_BUF_SIZE 64
|
|
|
|
typedef struct {
|
|
float buffer[RMS_BUF_SIZE];
|
|
unsigned int pos;
|
|
float sum;
|
|
} rms_env;
|
|
|
|
rms_env *rms_env_new();
|
|
|
|
static inline float rms_env_process(rms_env *r, float x);
|
|
|
|
void rms_env_reset(rms_env *r);
|
|
|
|
void rms_env_free(rms_env *r);
|
|
|
|
inline static float rms_env_process(rms_env *r, const float x)
|
|
{
|
|
r->sum -= r->buffer[r->pos];
|
|
r->sum += x;
|
|
if (r->sum < 1.0e-6) {
|
|
r->sum = 0.0f;
|
|
}
|
|
r->buffer[r->pos] = x;
|
|
r->pos = (r->pos + 1) & (RMS_BUF_SIZE - 1);
|
|
|
|
return sqrt(r->sum / (float)RMS_BUF_SIZE);
|
|
}
|
|
|
|
#endif
|