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annotate DPF-Prymula-audioplugins/dpf/distrho/extra/ValueSmoother.hpp @ 3:84e66ea83026

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DPF-Prymula-audioplugins-0.231015-2
author prymula <prymula76@outlook.com>
date Mon, 16 Oct 2023 21:53:34 +0200
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3
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1 /*
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2 * DISTRHO Plugin Framework (DPF)
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3 * Copyright (C) 2021 Jean Pierre Cimalando <jp-dev@inbox.ru>
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4 * Copyright (C) 2021-2023 Filipe Coelho <falktx@falktx.com>
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5 *
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6 * Permission to use, copy, modify, and/or distribute this software for any purpose with
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7 * or without fee is hereby granted, provided that the above copyright notice and this
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8 * permission notice appear in all copies.
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9 *
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
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11 * TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN
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12 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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13 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
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14 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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15 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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16 */
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17
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18 #ifndef DISTRHO_VALUE_SMOOTHER_HPP_INCLUDED
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19 #define DISTRHO_VALUE_SMOOTHER_HPP_INCLUDED
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20
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21 #include "../DistrhoUtils.hpp"
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22
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23 START_NAMESPACE_DISTRHO
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24
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25 // --------------------------------------------------------------------------------------------------------------------
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26
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27 /**
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28 * @brief An exponential smoother for control values
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29 *
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30 * This continually smooths a value towards a defined target,
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31 * using a low-pass filter of the 1st order, which creates an exponential curve.
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32 *
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33 * The length of the curve is defined by a T60 constant,
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34 * which is the time it takes for a 1-to-0 smoothing to fall to -60dB.
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35 *
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36 * Note that this smoother has asymptotical behavior,
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37 * and it must not be assumed that the final target is ever reached.
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38 */
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39 class ExponentialValueSmoother {
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40 float coef;
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41 float target;
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42 float mem;
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43 float tau;
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44 float sampleRate;
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45
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46 public:
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47 ExponentialValueSmoother()
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48 : coef(0.f),
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49 target(0.f),
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50 mem(0.f),
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51 tau(0.f),
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52 sampleRate(0.f) {}
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53
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54 void setSampleRate(const float newSampleRate) noexcept
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55 {
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56 if (d_isNotEqual(sampleRate, newSampleRate))
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57 {
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58 sampleRate = newSampleRate;
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59 updateCoef();
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60 }
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61 }
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62
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63 void setTimeConstant(const float newT60) noexcept
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64 {
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65 const float newTau = newT60 * (float)(1.0 / 6.91);
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66
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67 if (d_isNotEqual(tau, newTau))
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68 {
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69 tau = newTau;
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70 updateCoef();
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71 }
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72 }
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73
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74 float getCurrentValue() const noexcept
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75 {
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76 return mem;
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77 }
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78
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79 float getTargetValue() const noexcept
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80 {
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81 return target;
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82 }
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83
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84 void setTargetValue(const float newTarget) noexcept
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85 {
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86 target = newTarget;
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87 }
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88
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89 void clearToTargetValue() noexcept
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90 {
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91 mem = target;
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92 }
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93
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94 inline float peek() const noexcept
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95 {
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96 return mem * coef + target * (1.f - coef);
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97 }
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98
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99 inline float next() noexcept
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100 {
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101 return (mem = mem * coef + target * (1.f - coef));
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102 }
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103
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104 private:
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105 void updateCoef() noexcept
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106 {
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107 coef = std::exp(-1.f / (tau * sampleRate));
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108 }
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109 };
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110
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111 // --------------------------------------------------------------------------------------------------------------------
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112
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113 /**
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114 * @brief A linear smoother for control values
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115 *
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116 * This continually smooths a value towards a defined target, using linear segments.
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117 *
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118 * The duration of the smoothing segment is defined by the given time constant.
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119 * Every time the target changes, a new segment restarts for the whole duration of the time constant.
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120 *
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121 * Note that this smoother, unlike an exponential smoother, eventually should converge to its target value.
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122 */
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123 class LinearValueSmoother {
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124 float step;
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prymula <prymula76@outlook.com>
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125 float target;
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prymula <prymula76@outlook.com>
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126 float mem;
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prymula <prymula76@outlook.com>
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127 float tau;
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prymula <prymula76@outlook.com>
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128 float sampleRate;
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129
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130 public:
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prymula <prymula76@outlook.com>
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131 LinearValueSmoother()
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132 : step(0.f),
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133 target(0.f),
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134 mem(0.f),
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135 tau(0.f),
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prymula <prymula76@outlook.com>
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136 sampleRate(0.f) {}
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137
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138 void setSampleRate(const float newSampleRate) noexcept
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139 {
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140 if (d_isNotEqual(sampleRate, newSampleRate))
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141 {
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142 sampleRate = newSampleRate;
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prymula <prymula76@outlook.com>
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143 updateStep();
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144 }
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145 }
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146
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147 void setTimeConstant(const float newTau) noexcept
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148 {
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149 if (d_isNotEqual(tau, newTau))
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prymula <prymula76@outlook.com>
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150 {
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151 tau = newTau;
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prymula <prymula76@outlook.com>
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152 updateStep();
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153 }
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154 }
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155
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prymula <prymula76@outlook.com>
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156 float getCurrentValue() const noexcept
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157 {
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158 return mem;
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parents:
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159 }
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parents:
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160
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prymula <prymula76@outlook.com>
parents:
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161 float getTargetValue() const noexcept
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parents:
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162 {
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parents:
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163 return target;
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parents:
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164 }
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prymula <prymula76@outlook.com>
parents:
diff changeset
165
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prymula <prymula76@outlook.com>
parents:
diff changeset
166 void setTargetValue(const float newTarget) noexcept
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prymula <prymula76@outlook.com>
parents:
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167 {
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parents:
diff changeset
168 if (d_isNotEqual(target, newTarget))
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prymula <prymula76@outlook.com>
parents:
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169 {
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prymula <prymula76@outlook.com>
parents:
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170 target = newTarget;
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parents:
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171 updateStep();
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prymula <prymula76@outlook.com>
parents:
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172 }
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prymula <prymula76@outlook.com>
parents:
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173 }
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parents:
diff changeset
174
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prymula <prymula76@outlook.com>
parents:
diff changeset
175 void clearToTargetValue() noexcept
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prymula <prymula76@outlook.com>
parents:
diff changeset
176 {
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prymula <prymula76@outlook.com>
parents:
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177 mem = target;
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prymula <prymula76@outlook.com>
parents:
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178 }
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prymula <prymula76@outlook.com>
parents:
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179
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prymula <prymula76@outlook.com>
parents:
diff changeset
180 inline float peek() const noexcept
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prymula <prymula76@outlook.com>
parents:
diff changeset
181 {
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prymula <prymula76@outlook.com>
parents:
diff changeset
182 const float dy = target - mem;
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parents:
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183 return mem + std::copysign(std::fmin(std::abs(dy), std::abs(step)), dy);
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prymula <prymula76@outlook.com>
parents:
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184 }
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prymula <prymula76@outlook.com>
parents:
diff changeset
185
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prymula <prymula76@outlook.com>
parents:
diff changeset
186 inline float next() noexcept
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prymula <prymula76@outlook.com>
parents:
diff changeset
187 {
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prymula <prymula76@outlook.com>
parents:
diff changeset
188 const float y0 = mem;
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prymula <prymula76@outlook.com>
parents:
diff changeset
189 const float dy = target - y0;
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prymula <prymula76@outlook.com>
parents:
diff changeset
190 return (mem = y0 + std::copysign(std::fmin(std::abs(dy), std::abs(step)), dy));
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prymula <prymula76@outlook.com>
parents:
diff changeset
191 }
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prymula <prymula76@outlook.com>
parents:
diff changeset
192
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prymula <prymula76@outlook.com>
parents:
diff changeset
193 private:
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prymula <prymula76@outlook.com>
parents:
diff changeset
194 void updateStep() noexcept
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prymula <prymula76@outlook.com>
parents:
diff changeset
195 {
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prymula <prymula76@outlook.com>
parents:
diff changeset
196 step = (target - mem) / (tau * sampleRate);
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prymula <prymula76@outlook.com>
parents:
diff changeset
197 }
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prymula <prymula76@outlook.com>
parents:
diff changeset
198 };
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
199
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prymula <prymula76@outlook.com>
parents:
diff changeset
200 // --------------------------------------------------------------------------------------------------------------------
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prymula <prymula76@outlook.com>
parents:
diff changeset
201
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prymula <prymula76@outlook.com>
parents:
diff changeset
202 END_NAMESPACE_DISTRHO
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
203
84e66ea83026 DPF-Prymula-audioplugins-0.231015-2
prymula <prymula76@outlook.com>
parents:
diff changeset
204 #endif // DISTRHO_VALUE_SMOOTHER_HPP_INCLUDED