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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// SPDX-FileCopyrightText: Copyright (C) 2019 swift Project Community / Contributors</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-swift-pilot-client-1</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="preprocessor">#include "<a class="code" href="biquadfilter_8h.html">biquadfilter.h</a>"</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="preprocessor">#include "<a class="code" href="verify_8h.html">blackmisc/verify.h</a>"</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="preprocessor">#include "<a class="code" href="buildconfig_8h.html">blackconfig/buildconfig.h</a>"</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>  </div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="preprocessor">#include <QtMath></span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="preprocessor">#include <algorithm></span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>  </div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="keyword">using namespace </span><a class="code" href="namespace_black_misc.html">BlackMisc</a>;</div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="keyword">using namespace </span>BlackConfig;</div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>  </div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="keyword">namespace </span>BlackSound::Dsp</div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> {</div>
<div class="line"><a name="l00016"></a><span class="lineno"><a class="line" href="class_black_sound_1_1_dsp_1_1_bi_quad_filter.html#a8a6276ec926d8daec90e8829d21e4571"> 16</a></span>  <span class="keywordtype">float</span> BiQuadFilter::transform(<span class="keywordtype">float</span> inSample)</div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>  {</div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  <span class="comment">// compute result</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  <span class="keywordtype">double</span> result = m_a0 * inSample + m_a1 * m_x1 + m_a2 * m_x2 - m_a3 * m_y1 - m_a4 * m_y2;</div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>  </div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  <span class="comment">// shift x1 to x2, sample to x1</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  m_x2 = m_x1;</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>  m_x1 = inSample;</div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  </div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  <span class="comment">// shift y1 to y2, result to y1</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  m_y2 = m_y1;</div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  m_y1 = <span class="keyword">static_cast<</span><span class="keywordtype">float</span><span class="keyword">></span>(result);</div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  </div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  <span class="keywordflow">return</span> m_y1;</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>  </div>
<div class="line"><a name="l00032"></a><span class="lineno"><a class="line" href="class_black_sound_1_1_dsp_1_1_bi_quad_filter.html#a1f08856b7ab3535bd2c107eb6c942ab1"> 32</a></span>  <span class="keywordtype">void</span> BiQuadFilter::setCoefficients(<span class="keywordtype">double</span> aa0, <span class="keywordtype">double</span> aa1, <span class="keywordtype">double</span> aa2, <span class="keywordtype">double</span> b0, <span class="keywordtype">double</span> b1, <span class="keywordtype">double</span> b2)</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="keywordflow">if</span> (CBuildConfig::isLocalDeveloperDebugBuild()) { <a class="code" href="verify_8h.html#a720f9510406624948c10311879e88e17">BLACK_VERIFY_X</a>(qAbs(aa0) > 1E-06, Q_FUNC_INFO, <span class="stringliteral">"Div by zero?"</span>); }</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">// precompute the coefficients</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  m_a0 = b0 / aa0;</div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  m_a1 = b1 / aa0;</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  m_a2 = b2 / aa0;</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  m_a3 = aa1 / aa0;</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  m_a4 = aa2 / aa0;</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  }</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  </div>
<div class="line"><a name="l00044"></a><span class="lineno"><a class="line" href="class_black_sound_1_1_dsp_1_1_bi_quad_filter.html#a4b6c4bc16626faf25da5185909eb6fc1"> 44</a></span>  <span class="keywordtype">void</span> BiQuadFilter::setLowPassFilter(<span class="keywordtype">float</span> sampleRate, <span class="keywordtype">float</span> cutoffFrequency, <span class="keywordtype">float</span> q)</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">// H(s) = 1 / (s^2 + s/Q + 1)</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keyword">auto</span> w0 = 2 * M_PI * cutoffFrequency / sampleRate;</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="keyword">auto</span> cosw0 = qCos(w0);</div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keyword">auto</span> alpha = qSin(w0) / (2 * q);</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="keyword">auto</span> b0 = (1 - cosw0) / 2;</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="keyword">auto</span> b1 = 1 - cosw0;</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keyword">auto</span> b2 = (1 - cosw0) / 2;</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keyword">auto</span> aa0 = 1 + alpha;</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="keyword">auto</span> aa1 = -2 * cosw0;</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keyword">auto</span> aa2 = 1 - alpha;</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  setCoefficients(aa0, aa1, aa2, b0, b1, b2);</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"><a class="line" href="class_black_sound_1_1_dsp_1_1_bi_quad_filter.html#a188ee291770f8b0725a3649fa8c7ad66"> 60</a></span>  <span class="keywordtype">void</span> BiQuadFilter::setPeakingEq(<span class="keywordtype">float</span> sampleRate, <span class="keywordtype">float</span> centreFrequency, <span class="keywordtype">float</span> q, <span class="keywordtype">float</span> dbGain)</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  {</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="comment">// H(s) = (s^2 + s*(A/Q) + 1) / (s^2 + s/(A*Q) + 1)</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keyword">auto</span> w0 = 2 * M_PI * centreFrequency / sampleRate;</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keyword">auto</span> cosw0 = qCos(w0);</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keyword">auto</span> sinw0 = qSin(w0);</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="keyword">auto</span> alpha = sinw0 / (2 * q);</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keyword">auto</span> a = qPow(10, dbGain / 40); <span class="comment">// TODO: should we square root this value?</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  </div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keyword">auto</span> b0 = 1 + alpha * a;</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="keyword">auto</span> b1 = -2 * cosw0;</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="keyword">auto</span> b2 = 1 - alpha * a;</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keyword">auto</span> aa0 = 1 + alpha / a;</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keyword">auto</span> aa1 = -2 * cosw0;</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keyword">auto</span> aa2 = 1 - alpha / a;</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  setCoefficients(aa0, aa1, aa2, b0, b1, b2);</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>  </div>
<div class="line"><a name="l00078"></a><span class="lineno"><a class="line" href="class_black_sound_1_1_dsp_1_1_bi_quad_filter.html#adf21f3dffbc74232e16b413b169927d5"> 78</a></span>  <span class="keywordtype">void</span> BiQuadFilter::setHighPassFilter(<span class="keywordtype">float</span> sampleRate, <span class="keywordtype">float</span> cutoffFrequency, <span class="keywordtype">float</span> q)</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="comment">// H(s) = s^2 / (s^2 + s/Q + 1)</span></div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keyword">auto</span> w0 = 2 * M_PI * cutoffFrequency / sampleRate;</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keyword">auto</span> cosw0 = qCos(w0);</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keyword">auto</span> alpha = qSin(w0) / (2 * q);</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">auto</span> b0 = (1 + cosw0) / 2;</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keyword">auto</span> b1 = -(1 + cosw0);</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="keyword">auto</span> b2 = (1 + cosw0) / 2;</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keyword">auto</span> aa0 = 1 + alpha;</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keyword">auto</span> aa1 = -2 * cosw0;</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keyword">auto</span> aa2 = 1 - alpha;</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  setCoefficients(aa0, aa1, aa2, b0, b1, b2);</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  }</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  </div>
<div class="line"><a name="l00094"></a><span class="lineno"><a class="line" href="class_black_sound_1_1_dsp_1_1_bi_quad_filter.html#ae7686fc81518044ba5d869b82c465531"> 94</a></span>  <a class="code" href="class_black_sound_1_1_dsp_1_1_bi_quad_filter.html">BiQuadFilter</a> BiQuadFilter::lowPassFilter(<span class="keywordtype">float</span> sampleRate, <span class="keywordtype">float</span> cutoffFrequency, <span class="keywordtype">float</span> q)</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>  <a class="code" href="class_black_sound_1_1_dsp_1_1_bi_quad_filter.html">BiQuadFilter</a> filter;</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  filter.<a class="code" href="class_black_sound_1_1_dsp_1_1_bi_quad_filter.html#a4b6c4bc16626faf25da5185909eb6fc1">setLowPassFilter</a>(sampleRate, cutoffFrequency, q);</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="keywordflow">return</span> filter;</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  }</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  </div>
<div class="line"><a name="l00101"></a><span class="lineno"><a class="line" href="class_black_sound_1_1_dsp_1_1_bi_quad_filter.html#a743acd242cd8a79673f70a4696a3d846"> 101</a></span>  <a class="code" href="class_black_sound_1_1_dsp_1_1_bi_quad_filter.html">BiQuadFilter</a> BiQuadFilter::highPassFilter(<span class="keywordtype">float</span> sampleRate, <span class="keywordtype">float</span> cutoffFrequency, <span class="keywordtype">float</span> q)</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  {</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <a class="code" href="class_black_sound_1_1_dsp_1_1_bi_quad_filter.html">BiQuadFilter</a> filter;</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  filter.<a class="code" href="class_black_sound_1_1_dsp_1_1_bi_quad_filter.html#adf21f3dffbc74232e16b413b169927d5">setHighPassFilter</a>(sampleRate, cutoffFrequency, q);</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="keywordflow">return</span> filter;</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>  </div>
<div class="line"><a name="l00108"></a><span class="lineno"><a class="line" href="class_black_sound_1_1_dsp_1_1_bi_quad_filter.html#aae08c512c88cad5f4f32397de45dd4ac"> 108</a></span>  <a class="code" href="class_black_sound_1_1_dsp_1_1_bi_quad_filter.html">BiQuadFilter</a> BiQuadFilter::peakingEQ(<span class="keywordtype">float</span> sampleRate, <span class="keywordtype">float</span> centreFrequency, <span class="keywordtype">float</span> q, <span class="keywordtype">float</span> dbGain)</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>  <a class="code" href="class_black_sound_1_1_dsp_1_1_bi_quad_filter.html">BiQuadFilter</a> filter;</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  filter.<a class="code" href="class_black_sound_1_1_dsp_1_1_bi_quad_filter.html#a188ee291770f8b0725a3649fa8c7ad66">setPeakingEq</a>(sampleRate, centreFrequency, q, dbGain);</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="keywordflow">return</span> filter;</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> } <span class="comment">// ns</span></div>
<div class="ttc" id="abiquadfilter_8h_html"><div class="ttname"><a href="biquadfilter_8h.html">biquadfilter.h</a></div></div>
<div class="ttc" id="abuildconfig_8h_html"><div class="ttname"><a href="buildconfig_8h.html">buildconfig.h</a></div></div>
<div class="ttc" id="aclass_black_sound_1_1_dsp_1_1_bi_quad_filter_html"><div class="ttname"><a href="class_black_sound_1_1_dsp_1_1_bi_quad_filter.html">BlackSound::Dsp::BiQuadFilter</a></div><div class="ttdoc">Digital biquad filter.</div><div class="ttdef"><b>Definition:</b> <a href="biquadfilter_8h_source.html#l00014">biquadfilter.h:15</a></div></div>
<div class="ttc" id="aclass_black_sound_1_1_dsp_1_1_bi_quad_filter_html_a188ee291770f8b0725a3649fa8c7ad66"><div class="ttname"><a href="class_black_sound_1_1_dsp_1_1_bi_quad_filter.html#a188ee291770f8b0725a3649fa8c7ad66">BlackSound::Dsp::BiQuadFilter::setPeakingEq</a></div><div class="ttdeci">void setPeakingEq(float sampleRate, float centreFrequency, float q, float dbGain)</div><div class="ttdoc">Set filter parameters.</div><div class="ttdef"><b>Definition:</b> <a href="biquadfilter_8cpp_source.html#l00060">biquadfilter.cpp:60</a></div></div>
<div class="ttc" id="aclass_black_sound_1_1_dsp_1_1_bi_quad_filter_html_a4b6c4bc16626faf25da5185909eb6fc1"><div class="ttname"><a href="class_black_sound_1_1_dsp_1_1_bi_quad_filter.html#a4b6c4bc16626faf25da5185909eb6fc1">BlackSound::Dsp::BiQuadFilter::setLowPassFilter</a></div><div class="ttdeci">void setLowPassFilter(float sampleRate, float cutoffFrequency, float q)</div><div class="ttdoc">Set filter parameters.</div><div class="ttdef"><b>Definition:</b> <a href="biquadfilter_8cpp_source.html#l00044">biquadfilter.cpp:44</a></div></div>
<div class="ttc" id="aclass_black_sound_1_1_dsp_1_1_bi_quad_filter_html_adf21f3dffbc74232e16b413b169927d5"><div class="ttname"><a href="class_black_sound_1_1_dsp_1_1_bi_quad_filter.html#adf21f3dffbc74232e16b413b169927d5">BlackSound::Dsp::BiQuadFilter::setHighPassFilter</a></div><div class="ttdeci">void setHighPassFilter(float sampleRate, float cutoffFrequency, float q)</div><div class="ttdoc">Set filter parameters.</div><div class="ttdef"><b>Definition:</b> <a href="biquadfilter_8cpp_source.html#l00078">biquadfilter.cpp:78</a></div></div>
<div class="ttc" id="anamespace_black_misc_html"><div class="ttname"><a href="namespace_black_misc.html">BlackMisc</a></div><div class="ttdoc">Base and utility classes available in all other projects.</div><div class="ttdef"><b>Definition:</b> <a href="aircraftmatcher_8h_source.html#l00028">aircraftmatcher.h:29</a></div></div>
<div class="ttc" id="averify_8h_html"><div class="ttname"><a href="verify_8h.html">verify.h</a></div></div>
<div class="ttc" id="averify_8h_html_a720f9510406624948c10311879e88e17"><div class="ttname"><a href="verify_8h.html#a720f9510406624948c10311879e88e17">BLACK_VERIFY_X</a></div><div class="ttdeci">#define BLACK_VERIFY_X(COND, WHERE, WHAT)</div><div class="ttdoc">A weaker kind of assert.</div><div class="ttdef"><b>Definition:</b> <a href="verify_8h_source.html#l00025">verify.h:25</a></div></div>
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