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<div class="title">al_Crossover.hpp</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="preprocessor">#ifndef INCLUDE_AL_CROSSOVER_HPP</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="preprocessor">#define INCLUDE_AL_CROSSOVER_HPP</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span>  </div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">/* Allocore --</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> Multimedia / virtual environment application class library</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"></span> </div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> Copyright (C) 2009. AlloSphere Research Group, Media Arts & Technology, UCSB.</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> Copyright (C) 2012. The Regents of the University of California. All</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> rights reserved.</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"> Redistribution and use in source and binary forms, with or without</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> modification, are permitted provided that the following conditions are</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> met:</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"></span> </div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> Redistributions of source code must retain the above copyright</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> notice, this list of conditions and the following disclaimer.</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"> Redistributions in binary form must reproduce the above</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> copyright notice, this list of conditions and the following disclaimer in the</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> documentation and/or other materials provided with the</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> distribution.</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"></span> </div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment"> Neither the name of the University of California nor the names</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"> of its contributors may be used to endorse or promote products derived from</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"> this software without specific prior written permission.</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"></span> </div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"> IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment"> IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment"> PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment"> CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment"> EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment"> PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"> OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"> WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment"> OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment"> ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment"></span> </div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment"></span> </div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment"> File description:</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment"> CrossOver: a cross-over shelf filter that sums to an allpass</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment"> (Useful for mixing different Ambisonic encoding flavors)</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment"></span> </div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment"> File author(s):</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment"> Graham Wakefield, 2010, [email protected]</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment">*/</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  </div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="preprocessor">#include <float.h></span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="preprocessor">#include <stdio.h></span></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="preprocessor">#include "al/math/al_Constants.hpp"</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  </div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="keyword">namespace </span><a class="code" href="namespaceal.html">al</a> {</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  </div>
<div class="line"><a name="l00061"></a><span class="lineno"><a class="line" href="classal_1_1_crossover.html"> 61</a></span> <span class="keyword">template</span> <<span class="keyword">typename</span> T = <span class="keywordtype">double</span>> <span class="keyword">class </span><a class="code" href="classal_1_1_crossover.html">Crossover</a> {</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="keyword">public</span>:</div>
<div class="line"><a name="l00064"></a><span class="lineno"><a class="line" href="classal_1_1_crossover.html#a01edbae67e980cc974aa4d8e59fe5f15"> 64</a></span>  <span class="keywordtype">void</span> <a class="code" href="classal_1_1_crossover.html#a01edbae67e980cc974aa4d8e59fe5f15">freq</a>(T f, T fs);</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  </div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <a class="code" href="classal_1_1_crossover.html">Crossover</a>(T f = (T)600, T fs = (T)44100.) {</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <a class="code" href="classal_1_1_crossover.html#a01edbae67e980cc974aa4d8e59fe5f15">freq</a>(f, fs);</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  clear();</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  }</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  </div>
<div class="line"><a name="l00072"></a><span class="lineno"><a class="line" href="classal_1_1_crossover.html#a45282cc4940c1a84125d49cc6b5b3182"> 72</a></span>  <span class="keywordtype">void</span> <a class="code" href="classal_1_1_crossover.html#a45282cc4940c1a84125d49cc6b5b3182">next</a>(<span class="keyword">const</span> T in, T *lo, T *hi);</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  </div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keywordtype">void</span> clear() {</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  mZ0 = (T)0;</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  mZ1 = (T)0;</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  mZ2 = (T)0;</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  }</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  </div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="keyword">protected</span>:</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="comment">// coefficients and history</span></div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  T mC0, mC1, mZ0, mZ1, mZ2;</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> };</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  </div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="keyword">template</span> <> <span class="keywordtype">void</span> <a class="code" href="classal_1_1_crossover.html#a01edbae67e980cc974aa4d8e59fe5f15">Crossover<double>::freq</a>(<span class="keywordtype">double</span> f, <span class="keywordtype">double</span> fs) {</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordtype">double</span> rad = M_PI * 2. * f / fs;</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="keywordtype">double</span> cosine = cos(rad);</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordtype">double</span> sine = sin(rad);</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keywordflow">if</span> (abs(c) > 0.0001) {</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  mC0 = (sine - 1.) / cosine;</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  mC0 = cosine * 0.5;</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  }</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  mC1 = (1. + mC0) * 0.5;</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span> }</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  </div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span> <span class="keyword">template</span> <></div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="classal_1_1_crossover.html#a45282cc4940c1a84125d49cc6b5b3182">Crossover<double>::next</a>(<span class="keyword">const</span> <span class="keywordtype">double</span> in, <span class="keywordtype">double</span> *lo, <span class="keywordtype">double</span> *hi) {</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">double</span> denorm_offset = DBL_EPSILON * 2.;</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  </div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keyword">const</span> <span class="keywordtype">double</span> v0 = in - mC0 * mZ0;</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keyword">const</span> <span class="keywordtype">double</span> x0 = mZ0 + mC0 * v0;</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  </div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keyword">const</span> <span class="keywordtype">double</span> v1 = mC1 * (in - mZ1);</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="keyword">const</span> <span class="keywordtype">double</span> x1 = v1 + mZ1;</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  </div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="keyword">const</span> <span class="keywordtype">double</span> v2 = mC1 * (x1 - mZ2);</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keyword">const</span> <span class="keywordtype">double</span> x2 = v2 + mZ2;</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  </div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  mZ0 = v0 + denorm_offset;</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  mZ1 = v1 + x1 + denorm_offset;</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  mZ2 = v2 + x2 + denorm_offset;</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  </div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  *lo = x2;</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  *hi = x0 - x2;</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> }</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  </div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> <span class="keyword">template</span> <> <span class="keywordtype">void</span> <a class="code" href="classal_1_1_crossover.html#a01edbae67e980cc974aa4d8e59fe5f15">Crossover<float>::freq</a>(<span class="keywordtype">float</span> f, <span class="keywordtype">float</span> fs) {</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="keywordtype">float</span> rad = M_PI * 2.f * f / fs;</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="keywordtype">float</span> cosine = cosf(rad);</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="keywordtype">float</span> sine = sinf(rad);</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="keywordflow">if</span> (fabs(cosine) > 0.0001f) {</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  mC0 = (sine - 1.f) / cosine;</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  mC0 = cosine * 0.5f;</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  }</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  mC1 = (1.f + mC0) * 0.5f;</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span> }</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  </div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> <span class="keyword">template</span> <></div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span> <span class="keyword">inline</span> <span class="keywordtype">void</span> <a class="code" href="classal_1_1_crossover.html#a45282cc4940c1a84125d49cc6b5b3182">Crossover<float>::next</a>(<span class="keyword">const</span> <span class="keywordtype">float</span> in, <span class="keywordtype">float</span> *lo, <span class="keywordtype">float</span> *hi) {</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">float</span> denorm_offset = FLT_EPSILON * 2.;</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  </div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> v0 = in - mC0 * mZ0;</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> x0 = mZ0 + mC0 * v0;</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="keyword">const</span> <span class="keywordtype">float</span> v1 = mC1 * (in - mZ1);</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> x1 = v1 + mZ1;</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  </div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> v2 = mC1 * (x1 - mZ2);</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  <span class="keyword">const</span> <span class="keywordtype">float</span> x2 = v2 + mZ2;</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  </div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  mZ0 = v0 + denorm_offset;</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  mZ1 = v1 + x1 + denorm_offset;</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  mZ2 = v2 + x2 + denorm_offset;</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  </div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  *lo = x2;</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  *hi = x0 - x2;</div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span> }</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  </div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span> } <span class="comment">// namespace al</span></div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span> <span class="preprocessor">#endif</span></div>
<div class="ttc" id="aclassal_1_1_crossover_html"><div class="ttname"><a href="classal_1_1_crossover.html">al::Crossover</a></div><div class="ttdef"><b>Definition:</b> <a href="al___crossover_8hpp_source.html#l00061">al_Crossover.hpp:61</a></div></div>
<div class="ttc" id="aclassal_1_1_crossover_html_a01edbae67e980cc974aa4d8e59fe5f15"><div class="ttname"><a href="classal_1_1_crossover.html#a01edbae67e980cc974aa4d8e59fe5f15">al::Crossover::freq</a></div><div class="ttdeci">void freq(T f, T fs)</div><div class="ttdoc">set the cross-over middle frequency</div></div>
<div class="ttc" id="aclassal_1_1_crossover_html_a45282cc4940c1a84125d49cc6b5b3182"><div class="ttname"><a href="classal_1_1_crossover.html#a45282cc4940c1a84125d49cc6b5b3182">al::Crossover::next</a></div><div class="ttdeci">void next(const T in, T *lo, T *hi)</div><div class="ttdoc">process one sample and return hi/lo shelf</div></div>
<div class="ttc" id="anamespaceal_html"><div class="ttname"><a href="namespaceal.html">al</a></div><div class="ttdef"><b>Definition:</b> <a href="al___app_8hpp_source.html#l00023">al_App.hpp:23</a></div></div>
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