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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * Simple Limiter (runtime function)</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * File : SimpleLimitProcess.inl</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * Library : SimpleSource</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * Version : 1.12</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * Implements : void SimpleLimit::process( double &in1, double &in2 )</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * 2006, ChunkWare Music Software, OPEN-SOURCE</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * Permission is hereby granted, free of charge, to any person obtaining a</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * copy of this software and associated documentation files (the "Software"),</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * to deal in the Software without restriction, including without limitation</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * the rights to use, copy, modify, merge, publish, distribute, sublicense,</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * and/or sell copies of the Software, and to permit persons to whom the</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * Software is furnished to do so, subject to the following conditions:</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * The above copyright notice and this permission notice shall be included in</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> * all copies or substantial portions of the Software.</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"> * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment"> * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"> * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"> * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> * DEALINGS IN THE SOFTWARE.</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  </div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  </div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="preprocessor">#ifndef __SIMPLE_LIMIT_PROCESS_INL__</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="preprocessor">#define __SIMPLE_LIMIT_PROCESS_INL__</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  </div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="keyword">namespace </span>chunkware_simple</div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> {</div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="comment">//-------------------------------------------------------------</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"><a class="line" href="classchunkware__simple_1_1_simple_limit.html#af7519b6a5e2e1465f916990c4761b266"> 37</a></span>  INLINE <span class="keywordtype">void</span> <a class="code" href="classchunkware__simple_1_1_simple_limit.html#af7519b6a5e2e1465f916990c4761b266">SimpleLimit::process</a>( <span class="keywordtype">double</span> &in1, <span class="keywordtype">double</span> &in2 )</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  {</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="comment">// create sidechain</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  </div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="keywordtype">double</span> rect1 = fabs( in1 ); <span class="comment">// rectify input</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="keywordtype">double</span> rect2 = fabs( in2 );</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  </div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keywordtype">double</span> keyLink = std::max( rect1, rect2 ); <span class="comment">// link channels with greater of 2</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  </div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="comment">// threshold</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="comment">// we always want to feed the sidechain AT LEATS the threshold value</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="keywordflow">if</span> ( keyLink < thresh_ )</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  keyLink = thresh_;</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  </div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="comment">// test:</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="comment">// a) whether peak timer has "expired"</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="comment">// b) whether new peak is greater than previous max peak</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keywordflow">if</span> ( (++peakTimer_ >= peakHold_) || (keyLink > maxPeak_) ) {</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="comment">// if either condition is met:</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  peakTimer_ = 0; <span class="comment">// reset peak timer</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  maxPeak_ = keyLink; <span class="comment">// assign new peak to max peak</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  }</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  </div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="comment">/* REGARDING THE MAX PEAK: This method assumes that the only important</span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment"> * sample in a look-ahead buffer would be the highest peak. As such,</span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="comment"> * instead of storing all samples in a look-ahead buffer, it only stores</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="comment"> * the max peak, and compares all incoming samples to that one.</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="comment"> * The max peak has a hold time equal to what the look-ahead buffer</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="comment"> * would have been, which is tracked by a timer (counter). When this</span></div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="comment"> * timer expires, the sample would have exited from the buffer. Therefore,</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="comment"> * a new sample must be assigned to the max peak. We assume that the next</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="comment"> * highest sample in our theoretical buffer is the current input sample.</span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="comment"> * In reality, we know this is probably NOT the case, and that there has</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="comment"> * been another sample, slightly lower than the one before it, that has</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="comment"> * passed the input. If we do not account for this possibility, our gain</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="comment"> * reduction could be insufficient, resulting in an "over" at the output.</span></div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="comment"> * To remedy this, we simply apply a suitably long release stage in the</span></div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="comment"> * envelope follower.</span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  </div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="comment">// attack/release</span></div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="keywordflow">if</span> ( maxPeak_ > env_ )</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  att_.<a class="code" href="classchunkware__simple_1_1_envelope_detector.html#a59d5730de1b2aa9768462a5caff332fd">run</a>( maxPeak_, env_ ); <span class="comment">// run attack phase</span></div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  rel_.<a class="code" href="classchunkware__simple_1_1_envelope_detector.html#a59d5730de1b2aa9768462a5caff332fd">run</a>( maxPeak_, env_ ); <span class="comment">// run release phase</span></div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  </div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="comment">/* REGARDING THE ATTACK: This limiter achieves "look-ahead" detection</span></div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="comment"> * by allowing the envelope follower to attack the max peak, which is</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="comment"> * held for the duration of the attack phase -- unless a new, higher</span></div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="comment"> * peak is detected. The output signal is buffered so that the gain</span></div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="comment"> * reduction is applied in advance of the "offending" sample.</span></div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  </div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="comment">/* NOTE: a DC offset is not necessary for the envelope follower,</span></div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="comment"> * as neither the max peak nor envelope should fall below the</span></div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="comment"> * threshold (which is assumed to be around 1.0 linear).</span></div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  </div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="comment">// gain reduction</span></div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keywordtype">double</span> gR = thresh_ / env_;</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  </div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="comment">// unload current buffer index</span></div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="comment">// ( cur_ - delay ) & mask_ gets sample from [delay] samples ago</span></div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="comment">// mask_ variable wraps index</span></div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> delayIndex = ( cur_ - peakHold_ ) & mask_;</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keywordtype">double</span> delay1 = outBuffer_[ 0 ][ delayIndex ];</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="keywordtype">double</span> delay2 = outBuffer_[ 1 ][ delayIndex ];</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  </div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="comment">// load current buffer index and advance current index</span></div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="comment">// mask_ wraps cur_ index</span></div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  outBuffer_[ 0 ][ cur_ ] = in1;</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  outBuffer_[ 1 ][ cur_ ] = in2;</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  ++cur_ &= mask_;</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  </div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="comment">// output gain</span></div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  in1 = delay1 * gR; <span class="comment">// apply gain reduction to input</span></div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  in2 = delay2 * gR;</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  </div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="comment">/* REGARDING THE GAIN REDUCTION: Due to the logarithmic nature</span></div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> <span class="comment"> * of the attack phase, the sidechain will never achieve "full"</span></div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> <span class="comment"> * attack. (Actually, it is only guaranteed to achieve 99% of</span></div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> <span class="comment"> * the input value over the given time constant.) As such, the</span></div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span> <span class="comment"> * limiter cannot achieve "brick-wall" limiting. There are 2</span></div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span> <span class="comment"> * workarounds:</span></div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span> <span class="comment"> * 1) Set the threshold slightly lower than the desired threshold.</span></div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span> <span class="comment"> * i.e. 0.0dB -> -0.1dB or even -0.5dB</span></div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span> <span class="comment"> * 2) Clip the output at the threshold, as such:</span></div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span> <span class="comment"> * if ( in1 > thresh_ ) in1 = thresh_;</span></div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span> <span class="comment"> * else if ( in1 < -thresh_ ) in1 = -thresh_;</span></div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> <span class="comment"> * if ( in2 > thresh_ ) in2 = thresh_;</span></div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span> <span class="comment"> * else if ( in2 < -thresh_ ) in2 = -thresh_;</span></div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span> <span class="comment"> * (... or replace with your favorite branchless clipper ...)</span></div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  }</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  </div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span> } <span class="comment">// end namespace chunkware_simple</span></div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  </div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span> <span class="preprocessor">#endif </span><span class="comment">// end __SIMPLE_LIMIT_PROCESS_INL__</span></div>
<div class="ttc" id="aclasschunkware__simple_1_1_envelope_detector_html_a59d5730de1b2aa9768462a5caff332fd"><div class="ttname"><a href="classchunkware__simple_1_1_envelope_detector.html#a59d5730de1b2aa9768462a5caff332fd">chunkware_simple::EnvelopeDetector::run</a></div><div class="ttdeci">INLINE void run(double in, double &state)</div><div class="ttdoc">runtime function</div><div class="ttdef"><b>Definition:</b> <a href="_simple_envelope_8h_source.html#l00070">SimpleEnvelope.h:70</a></div></div>
<div class="ttc" id="aclasschunkware__simple_1_1_simple_limit_html_af7519b6a5e2e1465f916990c4761b266"><div class="ttname"><a href="classchunkware__simple_1_1_simple_limit.html#af7519b6a5e2e1465f916990c4761b266">chunkware_simple::SimpleLimit::process</a></div><div class="ttdeci">void process(double &in1, double &in2)</div><div class="ttdoc">limiter runtime process</div><div class="ttdef"><b>Definition:</b> <a href="_simple_limit_process_8inl_source.html#l00037">SimpleLimitProcess.inl:37</a></div></div>
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