Line data    Source code

       1              : #pragma once
       2              : 
       3              : #include <cstdint>
       4              : #include <cmath>
       5              : #include <algorithm>
       6              : #include <string>
       7              : #include <vector>
       8              : #include <array>
       9              : #include <memory>
      10              : #include <atomic>
      11              : #include <functional>
      12              : #include <mutex>
      13              : 
      14              : namespace Amplitron {
      15              : 
      16              : constexpr int DEFAULT_SAMPLE_RATE = 48000;
      17              : constexpr int DEFAULT_BUFFER_SIZE = 64;  // ~1.3ms latency at 48kHz
      18              : constexpr int MAX_BUFFER_SIZE = 512;
      19              : constexpr int MIN_BUFFER_SIZE = 32;
      20              : constexpr float PI = 3.14159265358979323846f;
      21              : constexpr float TWO_PI = 2.0f * PI;
      22              : 
      23      1107923 : inline float clamp(float value, float min_val, float max_val) {
      24      1085405 :     return std::max(min_val, std::min(max_val, value));
      25              : }
      26              : 
      27       181619 : inline float db_to_linear(float db) {
      28       193410 :     return std::pow(10.0f, db / 20.0f);
      29              : }
      30              : 
      31       238088 : inline float linear_to_db(float linear) {
      32       238092 :     return 20.0f * std::log10(std::max(linear, 1e-10f));
      33              : }
      34              : 
      35              : // Fast tanh approximation using Padé approximant.
      36              : // ~3× faster than std::tanh(), perceptually identical for musical signals.
      37         6144 : inline float fast_tanh(float x) {
      38         6144 :     float x2 = x * x;
      39         6144 :     return x * (27.0f + x2) / (27.0f + 9.0f * x2);
      40              : }
      41              : 
      42         6158 : inline float soft_clip(float x) {
      43         6158 :     if (x > 1.0f) return 2.0f / 3.0f;
      44         3983 :     if (x < -1.0f) return -2.0f / 3.0f;
      45         2205 :     return x - (x * x * x) / 3.0f;
      46         2055 : }
      47              : 
      48        26118 : inline float hard_clip(float x, float threshold) {
      49        26120 :     return clamp(x, -threshold, threshold);
      50              : }
      51              : 
      52              : // Simple one-pole low-pass filter for parameter smoothing
      53            2 : struct SmoothParam {
      54            2 :     float current = 0.0f;
      55            2 :     float target = 0.0f;
      56            2 :     float coeff = 0.995f;
      57              : 
      58              :     void set(float val) { target = val; }
      59          600 :     float next() {
      60          600 :         current += (target - current) * (1.0f - coeff);
      61          600 :         return current;
      62              :     }
      63            3 :     void snap() { current = target; }
      64              : };
      65              : 
      66              : } // namespace Amplitron