24 lines
533 B
C++
24 lines
533 B
C++
#pragma once
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#include <cmath>
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namespace trnr {
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struct rms_detector {
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float alpha;
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float rms_squared;
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};
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inline void rms_init(rms_detector& d, float samplerate, float window_ms)
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{
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float window_seconds = 0.001f * window_ms;
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d.alpha = 1.0f - expf(-1.0f / (samplerate * window_seconds));
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d.rms_squared = 0.0f;
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}
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template <typename sample>
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inline sample rms_process(rms_detector& d, sample input)
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{
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d.rms_squared = (1.0f - d.alpha) * d.rms_squared + d.alpha * (input * input);
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return sqrtf(d.rms_squared);
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}
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} // namespace trnr
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