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