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  67. <div class="header">

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  69. <div class="title">ValueSmoother.hpp</div>  </div>

  70. </div><!--header-->

  71. <div class="contents">

  72. <div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">/*</span></div>

  73. <div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment"> * DISTRHO Plugin Framework (DPF)</span></div>

  74. <div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment"> * Copyright (C) 2021 Jean Pierre Cimalando &lt;jp-dev@inbox.ru&gt;</span></div>

  75. <div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment"> * Copyright (C) 2021-2023 Filipe Coelho &lt;falktx@falktx.com&gt;</span></div>

  76. <div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment"> *</span></div>

  77. <div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment"> * Permission to use, copy, modify, and/or distribute this software for any purpose with</span></div>

  78. <div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment"> * or without fee is hereby granted, provided that the above copyright notice and this</span></div>

  79. <div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment"> * permission notice appear in all copies.</span></div>

  80. <div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="comment"> *</span></div>

  81. <div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="comment"> * THE SOFTWARE IS PROVIDED &quot;AS IS&quot; AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD</span></div>

  82. <div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="comment"> * TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN</span></div>

  83. <div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="comment"> * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL</span></div>

  84. <div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="comment"> * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER</span></div>

  85. <div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="comment"> * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN</span></div>

  86. <div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="comment"> * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.</span></div>

  87. <div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="comment"> */</span></div>

  88. <div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160; </div>

  89. <div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="preprocessor">#ifndef DISTRHO_VALUE_SMOOTHER_HPP_INCLUDED</span></div>

  90. <div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="preprocessor">#define DISTRHO_VALUE_SMOOTHER_HPP_INCLUDED</span></div>

  91. <div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160; </div>

  92. <div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="preprocessor">#include &quot;../DistrhoUtils.hpp&quot;</span></div>

  93. <div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160; </div>

  94. <div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<a class="code" href="group__NamespaceMacros.html#gac4cb97c393d20c28ba19365d844341cd">START_NAMESPACE_DISTRHO</a></div>

  95. <div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160; </div>

  96. <div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;<span class="comment">// --------------------------------------------------------------------------------------------------------------------</span></div>

  97. <div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="comment"></span> </div>

  98. <div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;<span class="comment">/**</span></div>

  99. <div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;<span class="comment"> * @brief An exponential smoother for control values</span></div>

  100. <div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;<span class="comment"> *</span></div>

  101. <div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;<span class="comment"> * This continually smooths a value towards a defined target,</span></div>

  102. <div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;<span class="comment"> * using a low-pass filter of the 1st order, which creates an exponential curve.</span></div>

  103. <div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;<span class="comment"> *</span></div>

  104. <div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;<span class="comment"> * The length of the curve is defined by a T60 constant,</span></div>

  105. <div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;<span class="comment"> * which is the time it takes for a 1-to-0 smoothing to fall to -60dB.</span></div>

  106. <div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;<span class="comment"> *</span></div>

  107. <div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;<span class="comment"> * Note that this smoother has asymptotical behavior,</span></div>

  108. <div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;<span class="comment"> * and it must not be assumed that the final target is ever reached.</span></div>

  109. <div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;<span class="comment"> */</span></div>

  110. <div class="line"><a name="l00039"></a><span class="lineno"><a class="line" href="classExponentialValueSmoother.html">   39</a></span>&#160;<span class="keyword">class </span><a class="code" href="classExponentialValueSmoother.html">ExponentialValueSmoother</a> {</div>

  111. <div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;    <span class="keywordtype">float</span> coef;</div>

  112. <div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;    <span class="keywordtype">float</span> target;</div>

  113. <div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;    <span class="keywordtype">float</span> mem;</div>

  114. <div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;    <span class="keywordtype">float</span> tau;</div>

  115. <div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;    <span class="keywordtype">float</span> sampleRate;</div>

  116. <div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160; </div>

  117. <div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;<span class="keyword">public</span>:</div>

  118. <div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;    <a class="code" href="classExponentialValueSmoother.html">ExponentialValueSmoother</a>()</div>

  119. <div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;        : coef(0.f),</div>

  120. <div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;          target(0.f),</div>

  121. <div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;          mem(0.f),</div>

  122. <div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;          tau(0.f),</div>

  123. <div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;          sampleRate(0.f) {}</div>

  124. <div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160; </div>

  125. <div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;    <span class="keywordtype">void</span> setSampleRate(<span class="keyword">const</span> <span class="keywordtype">float</span> newSampleRate) noexcept</div>

  126. <div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;    {</div>

  127. <div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;        <span class="keywordflow">if</span> (<a class="code" href="group__MathFunctions.html#ga3d70c97c300b9fb2792ba4fbb2fb501e">d_isNotEqual</a>(sampleRate, newSampleRate))</div>

  128. <div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;        {</div>

  129. <div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;            sampleRate = newSampleRate;</div>

  130. <div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;            updateCoef();</div>

  131. <div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;        }</div>

  132. <div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;    }</div>

  133. <div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160; </div>

  134. <div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;    <span class="keywordtype">void</span> setTimeConstant(<span class="keyword">const</span> <span class="keywordtype">float</span> newT60) noexcept</div>

  135. <div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;    {</div>

  136. <div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;        <span class="keyword">const</span> <span class="keywordtype">float</span> newTau = newT60 * (float)(1.0 / 6.91);</div>

  137. <div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160; </div>

  138. <div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;        <span class="keywordflow">if</span> (<a class="code" href="group__MathFunctions.html#ga3d70c97c300b9fb2792ba4fbb2fb501e">d_isNotEqual</a>(tau, newTau))</div>

  139. <div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;        {</div>

  140. <div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;            tau = newTau;</div>

  141. <div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;            updateCoef();</div>

  142. <div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;        }</div>

  143. <div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;    }</div>

  144. <div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160; </div>

  145. <div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;    <span class="keywordtype">float</span> getCurrentValue() <span class="keyword">const</span> noexcept</div>

  146. <div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;    {</div>

  147. <div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;        <span class="keywordflow">return</span> mem;</div>

  148. <div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;    }</div>

  149. <div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160; </div>

  150. <div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;    <span class="keywordtype">float</span> getTargetValue() <span class="keyword">const</span> noexcept</div>

  151. <div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;    {</div>

  152. <div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;        <span class="keywordflow">return</span> target;</div>

  153. <div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;    }</div>

  154. <div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160; </div>

  155. <div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;    <span class="keywordtype">void</span> setTargetValue(<span class="keyword">const</span> <span class="keywordtype">float</span> newTarget) noexcept</div>

  156. <div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;    {</div>

  157. <div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;        target = newTarget;</div>

  158. <div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;    }</div>

  159. <div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160; </div>

  160. <div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;    <span class="keywordtype">void</span> clearToTargetValue() noexcept</div>

  161. <div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;    {</div>

  162. <div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;        mem = target;</div>

  163. <div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;    }</div>

  164. <div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160; </div>

  165. <div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;    <span class="keyword">inline</span> <span class="keywordtype">float</span> peek() <span class="keyword">const</span> noexcept</div>

  166. <div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;    {</div>

  167. <div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;        <span class="keywordflow">return</span> mem * coef + target * (1.f - coef);</div>

  168. <div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;    }</div>

  169. <div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160; </div>

  170. <div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;    <span class="keyword">inline</span> <span class="keywordtype">float</span> next() noexcept</div>

  171. <div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;    {</div>

  172. <div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;        <span class="keywordflow">return</span> (mem = mem * coef + target * (1.f - coef));</div>

  173. <div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;    }</div>

  174. <div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160; </div>

  175. <div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;<span class="keyword">private</span>:</div>

  176. <div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;    <span class="keywordtype">void</span> updateCoef() noexcept</div>

  177. <div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;    {</div>

  178. <div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;        coef = std::exp(-1.f / (tau * sampleRate));</div>

  179. <div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;    }</div>

  180. <div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;};</div>

  181. <div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160; </div>

  182. <div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;<span class="comment">// --------------------------------------------------------------------------------------------------------------------</span></div>

  183. <div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;<span class="comment"></span> </div>

  184. <div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;<span class="comment">/**</span></div>

  185. <div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;<span class="comment"> * @brief A linear smoother for control values</span></div>

  186. <div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;<span class="comment"> *</span></div>

  187. <div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;<span class="comment"> * This continually smooths a value towards a defined target, using linear segments.</span></div>

  188. <div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;<span class="comment"> *</span></div>

  189. <div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;<span class="comment"> * The duration of the smoothing segment is defined by the given time constant.</span></div>

  190. <div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;<span class="comment"> * Every time the target changes, a new segment restarts for the whole duration of the time constant.</span></div>

  191. <div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;<span class="comment"> *</span></div>

  192. <div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;<span class="comment"> * Note that this smoother, unlike an exponential smoother, eventually should converge to its target value.</span></div>

  193. <div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;<span class="comment"> */</span></div>

  194. <div class="line"><a name="l00123"></a><span class="lineno"><a class="line" href="classLinearValueSmoother.html">  123</a></span>&#160;<span class="keyword">class </span><a class="code" href="classLinearValueSmoother.html">LinearValueSmoother</a> {</div>

  195. <div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;    <span class="keywordtype">float</span> step;</div>

  196. <div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;    <span class="keywordtype">float</span> target;</div>

  197. <div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;    <span class="keywordtype">float</span> mem;</div>

  198. <div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;    <span class="keywordtype">float</span> tau;</div>

  199. <div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;    <span class="keywordtype">float</span> sampleRate;</div>

  200. <div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160; </div>

  201. <div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;<span class="keyword">public</span>:</div>

  202. <div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;    <a class="code" href="classLinearValueSmoother.html">LinearValueSmoother</a>()</div>

  203. <div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;        : step(0.f),</div>

  204. <div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;          target(0.f),</div>

  205. <div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;          mem(0.f),</div>

  206. <div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;          tau(0.f),</div>

  207. <div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;          sampleRate(0.f) {}</div>

  208. <div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160; </div>

  209. <div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;    <span class="keywordtype">void</span> setSampleRate(<span class="keyword">const</span> <span class="keywordtype">float</span> newSampleRate) noexcept</div>

  210. <div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;    {</div>

  211. <div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;        <span class="keywordflow">if</span> (<a class="code" href="group__MathFunctions.html#ga3d70c97c300b9fb2792ba4fbb2fb501e">d_isNotEqual</a>(sampleRate, newSampleRate))</div>

  212. <div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;        {</div>

  213. <div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;            sampleRate = newSampleRate;</div>

  214. <div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;            updateStep();</div>

  215. <div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;        }</div>

  216. <div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;    }</div>

  217. <div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160; </div>

  218. <div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;    <span class="keywordtype">void</span> setTimeConstant(<span class="keyword">const</span> <span class="keywordtype">float</span> newTau) noexcept</div>

  219. <div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;    {</div>

  220. <div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;        <span class="keywordflow">if</span> (<a class="code" href="group__MathFunctions.html#ga3d70c97c300b9fb2792ba4fbb2fb501e">d_isNotEqual</a>(tau, newTau))</div>

  221. <div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;        {</div>

  222. <div class="line"><a name="l00151"></a><span class="lineno">  151</span>&#160;            tau = newTau;</div>

  223. <div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;            updateStep();</div>

  224. <div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;        }</div>

  225. <div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;    }</div>

  226. <div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160; </div>

  227. <div class="line"><a name="l00156"></a><span class="lineno">  156</span>&#160;    <span class="keywordtype">float</span> getCurrentValue() <span class="keyword">const</span> noexcept</div>

  228. <div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;    {</div>

  229. <div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160;        <span class="keywordflow">return</span> mem;</div>

  230. <div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;    }</div>

  231. <div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160; </div>

  232. <div class="line"><a name="l00161"></a><span class="lineno">  161</span>&#160;    <span class="keywordtype">float</span> getTargetValue() <span class="keyword">const</span> noexcept</div>

  233. <div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;    {</div>

  234. <div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160;        <span class="keywordflow">return</span> target;</div>

  235. <div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;    }</div>

  236. <div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160; </div>

  237. <div class="line"><a name="l00166"></a><span class="lineno">  166</span>&#160;    <span class="keywordtype">void</span> setTargetValue(<span class="keyword">const</span> <span class="keywordtype">float</span> newTarget) noexcept</div>

  238. <div class="line"><a name="l00167"></a><span class="lineno">  167</span>&#160;    {</div>

  239. <div class="line"><a name="l00168"></a><span class="lineno">  168</span>&#160;        <span class="keywordflow">if</span> (<a class="code" href="group__MathFunctions.html#ga3d70c97c300b9fb2792ba4fbb2fb501e">d_isNotEqual</a>(target, newTarget))</div>

  240. <div class="line"><a name="l00169"></a><span class="lineno">  169</span>&#160;        {</div>

  241. <div class="line"><a name="l00170"></a><span class="lineno">  170</span>&#160;            target = newTarget;</div>

  242. <div class="line"><a name="l00171"></a><span class="lineno">  171</span>&#160;            updateStep();</div>

  243. <div class="line"><a name="l00172"></a><span class="lineno">  172</span>&#160;        }</div>

  244. <div class="line"><a name="l00173"></a><span class="lineno">  173</span>&#160;    }</div>

  245. <div class="line"><a name="l00174"></a><span class="lineno">  174</span>&#160; </div>

  246. <div class="line"><a name="l00175"></a><span class="lineno">  175</span>&#160;    <span class="keywordtype">void</span> clearToTargetValue() noexcept</div>

  247. <div class="line"><a name="l00176"></a><span class="lineno">  176</span>&#160;    {</div>

  248. <div class="line"><a name="l00177"></a><span class="lineno">  177</span>&#160;        mem = target;</div>

  249. <div class="line"><a name="l00178"></a><span class="lineno">  178</span>&#160;    }</div>

  250. <div class="line"><a name="l00179"></a><span class="lineno">  179</span>&#160; </div>

  251. <div class="line"><a name="l00180"></a><span class="lineno">  180</span>&#160;    <span class="keyword">inline</span> <span class="keywordtype">float</span> peek() <span class="keyword">const</span> noexcept</div>

  252. <div class="line"><a name="l00181"></a><span class="lineno">  181</span>&#160;    {</div>

  253. <div class="line"><a name="l00182"></a><span class="lineno">  182</span>&#160;        <span class="keyword">const</span> <span class="keywordtype">float</span> dy = target - mem;</div>

  254. <div class="line"><a name="l00183"></a><span class="lineno">  183</span>&#160;        <span class="keywordflow">return</span> mem + std::copysign(std::fmin(std::abs(dy), std::abs(step)), dy);</div>

  255. <div class="line"><a name="l00184"></a><span class="lineno">  184</span>&#160;    }</div>

  256. <div class="line"><a name="l00185"></a><span class="lineno">  185</span>&#160; </div>

  257. <div class="line"><a name="l00186"></a><span class="lineno">  186</span>&#160;    <span class="keyword">inline</span> <span class="keywordtype">float</span> next() noexcept</div>

  258. <div class="line"><a name="l00187"></a><span class="lineno">  187</span>&#160;    {</div>

  259. <div class="line"><a name="l00188"></a><span class="lineno">  188</span>&#160;        <span class="keyword">const</span> <span class="keywordtype">float</span> y0 = mem;</div>

  260. <div class="line"><a name="l00189"></a><span class="lineno">  189</span>&#160;        <span class="keyword">const</span> <span class="keywordtype">float</span> dy = target - y0;</div>

  261. <div class="line"><a name="l00190"></a><span class="lineno">  190</span>&#160;        <span class="keywordflow">return</span> (mem = y0 + std::copysign(std::fmin(std::abs(dy), std::abs(step)), dy));</div>

  262. <div class="line"><a name="l00191"></a><span class="lineno">  191</span>&#160;    }</div>

  263. <div class="line"><a name="l00192"></a><span class="lineno">  192</span>&#160; </div>

  264. <div class="line"><a name="l00193"></a><span class="lineno">  193</span>&#160;<span class="keyword">private</span>:</div>

  265. <div class="line"><a name="l00194"></a><span class="lineno">  194</span>&#160;    <span class="keywordtype">void</span> updateStep() noexcept</div>

  266. <div class="line"><a name="l00195"></a><span class="lineno">  195</span>&#160;    {</div>

  267. <div class="line"><a name="l00196"></a><span class="lineno">  196</span>&#160;        step = (target - mem) / (tau * sampleRate);</div>

  268. <div class="line"><a name="l00197"></a><span class="lineno">  197</span>&#160;    }</div>

  269. <div class="line"><a name="l00198"></a><span class="lineno">  198</span>&#160;};</div>

  270. <div class="line"><a name="l00199"></a><span class="lineno">  199</span>&#160; </div>

  271. <div class="line"><a name="l00200"></a><span class="lineno">  200</span>&#160;<span class="comment">// --------------------------------------------------------------------------------------------------------------------</span></div>

  272. <div class="line"><a name="l00201"></a><span class="lineno">  201</span>&#160; </div>

  273. <div class="line"><a name="l00202"></a><span class="lineno">  202</span>&#160;<a class="code" href="group__NamespaceMacros.html#ga3ff541a449593e069a29e92d21e38ef3">END_NAMESPACE_DISTRHO</a></div>

  274. <div class="line"><a name="l00203"></a><span class="lineno">  203</span>&#160; </div>

  275. <div class="line"><a name="l00204"></a><span class="lineno">  204</span>&#160;<span class="preprocessor">#endif </span><span class="comment">// DISTRHO_VALUE_SMOOTHER_HPP_INCLUDED</span></div>

  276. <div class="ttc" id="aclassExponentialValueSmoother_html"><div class="ttname"><a href="classExponentialValueSmoother.html">ExponentialValueSmoother</a></div><div class="ttdoc">An exponential smoother for control values.</div><div class="ttdef"><b>Definition:</b> ValueSmoother.hpp:39</div></div>

  277. <div class="ttc" id="aclassLinearValueSmoother_html"><div class="ttname"><a href="classLinearValueSmoother.html">LinearValueSmoother</a></div><div class="ttdoc">A linear smoother for control values.</div><div class="ttdef"><b>Definition:</b> ValueSmoother.hpp:123</div></div>

  278. <div class="ttc" id="agroup__MathFunctions_html_ga3d70c97c300b9fb2792ba4fbb2fb501e"><div class="ttname"><a href="group__MathFunctions.html#ga3d70c97c300b9fb2792ba4fbb2fb501e">d_isNotEqual</a></div><div class="ttdeci">static constexpr bool d_isNotEqual(const T &amp;v1, const T &amp;v2)</div><div class="ttdef"><b>Definition:</b> DistrhoUtils.hpp:279</div></div>

  279. <div class="ttc" id="agroup__NamespaceMacros_html_ga3ff541a449593e069a29e92d21e38ef3"><div class="ttname"><a href="group__NamespaceMacros.html#ga3ff541a449593e069a29e92d21e38ef3">END_NAMESPACE_DISTRHO</a></div><div class="ttdeci">#define END_NAMESPACE_DISTRHO</div><div class="ttdef"><b>Definition:</b> DistrhoInfo.hpp:949</div></div>

  280. <div class="ttc" id="agroup__NamespaceMacros_html_gac4cb97c393d20c28ba19365d844341cd"><div class="ttname"><a href="group__NamespaceMacros.html#gac4cb97c393d20c28ba19365d844341cd">START_NAMESPACE_DISTRHO</a></div><div class="ttdeci">#define START_NAMESPACE_DISTRHO</div><div class="ttdef"><b>Definition:</b> DistrhoInfo.hpp:943</div></div>

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