48 lines
1.6 KiB
C++
48 lines
1.6 KiB
C++
/*
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* audio_math.h
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* Copyright (c) 2025 Christopher Herb
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#pragma once
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#include <math.h>
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namespace trnr {
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inline double lin_2_db(double lin)
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{
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if (lin <= 1e-20) lin = 1e-20; // avoid log(0)
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return 20.0 * log10(lin);
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}
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inline double db_2_lin(double db) { return pow(10.0, db / 20.0); }
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inline float midi_to_frequency(float midi_note)
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{
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return 440.0 * powf(2.0, ((float)midi_note - 69.0) / 12.0);
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}
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inline float ms_to_samples(float ms, double sample_rate)
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{
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return (ms * 0.001f) * (float)sample_rate;
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}
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} // namespace trnr
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