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jLynx 2023-05-19 08:16:05 +12:00 • committed by GitHub
parent 7aca7ce74d
commit 033c4e9a5b
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42
firmware/baseband/audio_compressor.cpp
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@ -22,31 +22,31 @@
#include "audio_compressor.hpp"
float GainComputer::operator()(const float x) const {
const auto abs_x = std::abs(x);
const auto db = (abs_x < lin_floor) ? db_floor : log2_db_k * fast_log2(abs_x);
const auto overshoot_db = db - threshold_db;
if( knee_width_db > 0.0f ) {
const auto w2 = knee_width_db / 2.0f;
const auto a = w2 / (knee_width_db * knee_width_db);
const auto in_transition = (overshoot_db > -w2) && (overshoot_db < w2);
const auto rectified_overshoot = in_transition ? (a * std::pow(overshoot_db + w2, 2.0f)) : std::max(overshoot_db, 0.0f);
return rectified_overshoot * slope;
} else {
const auto rectified_overshoot = std::max(overshoot_db, 0.0f);
return rectified_overshoot * slope;
}
const auto abs_x = std::abs(x);
const auto db = (abs_x < lin_floor) ? db_floor : log2_db_k * fast_log2(abs_x);
const auto overshoot_db = db - threshold_db;
if (knee_width_db > 0.0f) {
const auto w2 = knee_width_db / 2.0f;
const auto a = w2 / (knee_width_db * knee_width_db);
const auto in_transition = (overshoot_db > -w2) && (overshoot_db < w2);
const auto rectified_overshoot = in_transition ? (a * std::pow(overshoot_db + w2, 2.0f)) : std::max(overshoot_db, 0.0f);
return rectified_overshoot * slope;
} else {
const auto rectified_overshoot = std::max(overshoot_db, 0.0f);
return rectified_overshoot * slope;
}
}
void FeedForwardCompressor::execute_in_place(const buffer_f32_t& buffer) {
constexpr float makeup_gain = std::pow(10.0f, (threshold - (threshold / ratio)) / -20.0f);
for(size_t i=0; i<buffer.count; i++) {
buffer.p[i] = execute_once(buffer.p[i]) * makeup_gain;
}
constexpr float makeup_gain = std::pow(10.0f, (threshold - (threshold / ratio)) / -20.0f);
for (size_t i = 0; i < buffer.count; i++) {
buffer.p[i] = execute_once(buffer.p[i]) * makeup_gain;
}
}
float FeedForwardCompressor::execute_once(const float x) {
const auto gain_db = gain_computer(x);
const auto peak_db = -peak_detector(-gain_db);
const auto gain = fast_pow2(peak_db * (3.321928094887362f / 20.0f));
return x * gain;
const auto gain_db = gain_computer(x);
const auto peak_db = -peak_detector(-gain_db);
const auto gain = fast_pow2(peak_db * (3.321928094887362f / 20.0f));
return x * gain;
}