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Update code docs to v2.7 SDK
author Chris Cannam
date Fri, 24 Feb 2017 16:44:47 +0000
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79 <a href="ZeroCrossing_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */</span> 66 <a href="ZeroCrossing_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<span class="comment">/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;</div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;<span class="comment">/*</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160;<span class="comment"> Vamp</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<span class="comment"></span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;<span class="comment"> An API for audio analysis and feature extraction plugins.</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<span class="comment"></span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;<span class="comment"> Centre for Digital Music, Queen Mary, University of London.</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<span class="comment"> Copyright 2006 Chris Cannam.</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="comment"> </span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<span class="comment"> Permission is hereby granted, free of charge, to any person</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;<span class="comment"> obtaining a copy of this software and associated documentation</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<span class="comment"> files (the &quot;Software&quot;), to deal in the Software without</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;<span class="comment"> restriction, including without limitation the rights to use, copy,</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;<span class="comment"> modify, merge, publish, distribute, sublicense, and/or sell copies</span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;<span class="comment"> of the Software, and to permit persons to whom the Software is</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;<span class="comment"> furnished to do so, subject to the following conditions:</span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160;<span class="comment"></span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160;<span class="comment"> The above copyright notice and this permission notice shall be</span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;<span class="comment"> included in all copies or substantial portions of the Software.</span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160;<span class="comment"></span></div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160;<span class="comment"> THE SOFTWARE IS PROVIDED &quot;AS IS&quot;, WITHOUT WARRANTY OF ANY KIND,</span></div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160;<span class="comment"> EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF</span></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160;<span class="comment"> MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND</span></div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160;<span class="comment"> NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR</span></div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160;<span class="comment"> ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF</span></div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span>&#160;<span class="comment"> CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION</span></div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span>&#160;<span class="comment"> WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.</span></div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160;<span class="comment"></span></div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>&#160;<span class="comment"> Except as contained in this notice, the names of the Centre for</span></div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160;<span class="comment"> Digital Music; Queen Mary, University of London; and Chris Cannam</span></div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>&#160;<span class="comment"> shall not be used in advertising or otherwise to promote the sale,</span></div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160;<span class="comment"> use or other dealings in this Software without prior written</span></div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160;<span class="comment"> authorization.</span></div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>&#160;<span class="comment">*/</span></div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160;</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="ZeroCrossing_8h.html">ZeroCrossing.h</a>&quot;</span></div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160;</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160;<span class="keyword">using</span> std::string;</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>&#160;<span class="keyword">using</span> std::vector;</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160;<span class="keyword">using</span> std::cerr;</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160;<span class="keyword">using</span> std::endl;</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160;</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160;<span class="preprocessor">#include &lt;cmath&gt;</span></div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160;<span class="preprocessor">#include &lt;algorithm&gt;</span></div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160;</div><div class="line"><a name="l00047"></a><span class="lineno"><a class="line" href="classZeroCrossing.html#a9855153a54bdc9ba75cc1a705a149473"> 47</a></span>&#160;<a class="code" href="classZeroCrossing.html#a9855153a54bdc9ba75cc1a705a149473">ZeroCrossing::ZeroCrossing</a>(<span class="keywordtype">float</span> inputSampleRate) :</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160; Plugin(inputSampleRate),</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>&#160; m_stepSize(0),</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160; m_previousSample(0.0f)</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160;{</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160;}</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160;</div><div class="line"><a name="l00054"></a><span class="lineno"><a class="line" href="classZeroCrossing.html#af1de0da862e6e2443581e4e16044675b"> 54</a></span>&#160;<a class="code" href="classZeroCrossing.html#af1de0da862e6e2443581e4e16044675b">ZeroCrossing::~ZeroCrossing</a>()</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160;{</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160;}</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160;</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160;<span class="keywordtype">string</span></div><div class="line"><a name="l00059"></a><span class="lineno"><a class="line" href="classZeroCrossing.html#af5049a01a3f003f17a45c61b599c6543"> 59</a></span>&#160;<a class="code" href="classZeroCrossing.html#af5049a01a3f003f17a45c61b599c6543">ZeroCrossing::getIdentifier</a>()<span class="keyword"> const</span></div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160;<span class="keyword"></span>{</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160; <span class="keywordflow">return</span> <span class="stringliteral">&quot;zerocrossing&quot;</span>;</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160;}</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160;</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160;<span class="keywordtype">string</span></div><div class="line"><a name="l00065"></a><span class="lineno"><a class="line" href="classZeroCrossing.html#a191365f793e6488d02d57029eb14deb2"> 65</a></span>&#160;<a class="code" href="classZeroCrossing.html#a191365f793e6488d02d57029eb14deb2">ZeroCrossing::getName</a>()<span class="keyword"> const</span></div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160;<span class="keyword"></span>{</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; <span class="keywordflow">return</span> <span class="stringliteral">&quot;Zero Crossings&quot;</span>;</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160;}</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160;</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160;<span class="keywordtype">string</span></div><div class="line"><a name="l00071"></a><span class="lineno"><a class="line" href="classZeroCrossing.html#a7ba1cfd102a427f8333ddfa2fe234d58"> 71</a></span>&#160;<a class="code" href="classZeroCrossing.html#a7ba1cfd102a427f8333ddfa2fe234d58">ZeroCrossing::getDescription</a>()<span class="keyword"> const</span></div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160;<span class="keyword"></span>{</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160; <span class="keywordflow">return</span> <span class="stringliteral">&quot;Detect and count zero crossing points&quot;</span>;</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160;}</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160;</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160;<span class="keywordtype">string</span></div><div class="line"><a name="l00077"></a><span class="lineno"><a class="line" href="classZeroCrossing.html#a9ddf295d977b6c64d8acd34b7e0ce1b0"> 77</a></span>&#160;<a class="code" href="classZeroCrossing.html#a9ddf295d977b6c64d8acd34b7e0ce1b0">ZeroCrossing::getMaker</a>()<span class="keyword"> const</span></div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160;<span class="keyword"></span>{</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160; <span class="keywordflow">return</span> <span class="stringliteral">&quot;Vamp SDK Example Plugins&quot;</span>;</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>&#160;}</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160;</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160;<span class="keywordtype">int</span></div><div class="line"><a name="l00083"></a><span class="lineno"><a class="line" href="classZeroCrossing.html#a4199350192d84a4ec5f379805cd3e7cf"> 83</a></span>&#160;<a class="code" href="classZeroCrossing.html#a4199350192d84a4ec5f379805cd3e7cf">ZeroCrossing::getPluginVersion</a>()<span class="keyword"> const</span></div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>&#160;<span class="keyword"></span>{</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160; <span class="keywordflow">return</span> 2;</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160;}</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160;</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>&#160;<span class="keywordtype">string</span></div><div class="line"><a name="l00089"></a><span class="lineno"><a class="line" href="classZeroCrossing.html#af955fb85b26a5497690aecbd288975f2"> 89</a></span>&#160;<a class="code" href="classZeroCrossing.html#af955fb85b26a5497690aecbd288975f2">ZeroCrossing::getCopyright</a>()<span class="keyword"> const</span></div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160;<span class="keyword"></span>{</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160; <span class="keywordflow">return</span> <span class="stringliteral">&quot;Freely redistributable (BSD license)&quot;</span>;</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160;}</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160;</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160;<span class="keywordtype">bool</span></div><div class="line"><a name="l00095"></a><span class="lineno"><a class="line" href="classZeroCrossing.html#af21bbcc87a6eb7875dfab7d86222dccc"> 95</a></span>&#160;<a class="code" href="classZeroCrossing.html#af21bbcc87a6eb7875dfab7d86222dccc">ZeroCrossing::initialise</a>(<span class="keywordtype">size_t</span> channels, <span class="keywordtype">size_t</span> stepSize, <span class="keywordtype">size_t</span> blockSize)</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&#160;{</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>&#160; <span class="keywordflow">if</span> (channels &lt; <a class="code" href="classVamp_1_1Plugin.html#ab74f7634c6ac6e3da115667808a79c30">getMinChannelCount</a>() ||</div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>&#160; channels &gt; <a class="code" href="classVamp_1_1Plugin.html#a0bff9464bc8c117470136c396b2405dd">getMaxChannelCount</a>()) <span class="keywordflow">return</span> <span class="keyword">false</span>;</div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>&#160;</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160; <a class="code" href="classZeroCrossing.html#a584f100b87c78f9af9da040d79567d52">m_stepSize</a> = std::min(stepSize, blockSize);</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>&#160;</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>&#160; <span class="keywordflow">return</span> <span class="keyword">true</span>;</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160;}</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>&#160;</div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>&#160;<span class="keywordtype">void</span></div><div class="line"><a name="l00106"></a><span class="lineno"><a class="line" href="classZeroCrossing.html#a9ae6c4a31ea027dceb1e97ead807e228"> 106</a></span>&#160;<a class="code" href="classZeroCrossing.html#a9ae6c4a31ea027dceb1e97ead807e228">ZeroCrossing::reset</a>()</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>&#160;{</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>&#160; <a class="code" href="classZeroCrossing.html#a0f2d9f2cab0a8a30344e1f2c0ebb8ee8">m_previousSample</a> = 0.0f;</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160;}</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160;</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>&#160;<a class="code" href="classVamp_1_1Plugin.html#a30f531b8fb69fac41a24e3d2a6a08ed9">ZeroCrossing::OutputList</a></div><div class="line"><a name="l00112"></a><span class="lineno"><a class="line" href="classZeroCrossing.html#ab83cfab3f9674920e295c2f3571bb24e"> 112</a></span>&#160;<a class="code" href="classZeroCrossing.html#ab83cfab3f9674920e295c2f3571bb24e">ZeroCrossing::getOutputDescriptors</a>()<span class="keyword"> const</span></div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160;<span class="keyword"></span>{</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160; <a class="code" href="classVamp_1_1Plugin.html#a30f531b8fb69fac41a24e3d2a6a08ed9">OutputList</a> list;</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>&#160;</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>&#160; <a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html">OutputDescriptor</a> zc;</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>&#160; zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#ae2c893ddb1860589517ab7eaa989a18b">identifier</a> = <span class="stringliteral">&quot;counts&quot;</span>;</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>&#160; zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#ab824b2b34ee50f897a30901c620e8d87">name</a> = <span class="stringliteral">&quot;Zero Crossing Counts&quot;</span>;</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>&#160; zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#af9b4fe8f78e7126ead820ba5dc55efd1">description</a> = <span class="stringliteral">&quot;The number of zero crossing points per processing block&quot;</span>;</div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>&#160; zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#aa057a8833fa037f06ac9f7b85b85d5e4">unit</a> = <span class="stringliteral">&quot;crossings&quot;</span>;</div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>&#160; zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#af0e577e1a256ff6eed6ea42133fec77d">hasFixedBinCount</a> = <span class="keyword">true</span>;</div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span>&#160; zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#afdd006959a995e40ef7d565a3a4df6dc">binCount</a> = 1;</div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span>&#160; zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#ae9ccb65f99f477096b65dd031f4c5e31">hasKnownExtents</a> = <span class="keyword">false</span>;</div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>&#160; zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#a1b4858928d23bfd7d5bc557c82a83fb4">isQuantized</a> = <span class="keyword">true</span>;</div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>&#160; zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#a3bed37153067b625b95acb40b60dbf0b">quantizeStep</a> = 1.0;</div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span>&#160; zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#a0d1194980d44e31b25ef3b4b070d6b5d">sampleType</a> = <a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#abffa9ed50cd756df70fd51f0355f448ca0459d5d0d2198d21e8bc90abe4fdccca">OutputDescriptor::OneSamplePerStep</a>;</div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span>&#160; list.push_back(zc);</div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span>&#160;</div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span>&#160; zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#ae2c893ddb1860589517ab7eaa989a18b">identifier</a> = <span class="stringliteral">&quot;zerocrossings&quot;</span>;</div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span>&#160; zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#ab824b2b34ee50f897a30901c620e8d87">name</a> = <span class="stringliteral">&quot;Zero Crossings&quot;</span>;</div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span>&#160; zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#af9b4fe8f78e7126ead820ba5dc55efd1">description</a> = <span class="stringliteral">&quot;The locations of zero crossing points&quot;</span>;</div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span>&#160; zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#aa057a8833fa037f06ac9f7b85b85d5e4">unit</a> = <span class="stringliteral">&quot;&quot;</span>;</div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span>&#160; zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#af0e577e1a256ff6eed6ea42133fec77d">hasFixedBinCount</a> = <span class="keyword">true</span>;</div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span>&#160; zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#afdd006959a995e40ef7d565a3a4df6dc">binCount</a> = 0;</div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span>&#160; zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#a0d1194980d44e31b25ef3b4b070d6b5d">sampleType</a> = <a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#abffa9ed50cd756df70fd51f0355f448cadea995a737867f7b22b52f1c43c5432e">OutputDescriptor::VariableSampleRate</a>;</div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span>&#160; zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#add0cbbdfa9c91764037c39365b1d42af">sampleRate</a> = <a class="code" href="classVamp_1_1Plugin.html#a59b9dd82a4f4eb946cd0474cc81abc23">m_inputSampleRate</a>;</div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span>&#160; list.push_back(zc);</div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span>&#160;</div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span>&#160; <span class="keywordflow">return</span> list;</div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span>&#160;}</div><div class="line"><a name="l00141"></a><span class="lineno"> 141</span>&#160;</div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span>&#160;<a class="code" href="classVamp_1_1Plugin.html#a448fb57dc245d47923ec9eeaf9856c5f">ZeroCrossing::FeatureSet</a></div><div class="line"><a name="l00143"></a><span class="lineno"><a class="line" href="classZeroCrossing.html#abf4aaa6fd8cc03de63f4e1e8942633da"> 143</a></span>&#160;<a class="code" href="classZeroCrossing.html#abf4aaa6fd8cc03de63f4e1e8942633da">ZeroCrossing::process</a>(<span class="keyword">const</span> <span class="keywordtype">float</span> *<span class="keyword">const</span> *inputBuffers,</div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span>&#160; <a class="code" href="structVamp_1_1RealTime.html">Vamp::RealTime</a> timestamp)</div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span>&#160;{</div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span>&#160; <span class="keywordflow">if</span> (<a class="code" href="classZeroCrossing.html#a584f100b87c78f9af9da040d79567d52">m_stepSize</a> == 0) {</div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span>&#160; cerr &lt;&lt; <span class="stringliteral">&quot;ERROR: ZeroCrossing::process: &quot;</span></div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span>&#160; &lt;&lt; <span class="stringliteral">&quot;ZeroCrossing has not been initialised&quot;</span></div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span>&#160; &lt;&lt; endl;</div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span>&#160; <span class="keywordflow">return</span> <a class="code" href="classVamp_1_1Plugin.html#a448fb57dc245d47923ec9eeaf9856c5f">FeatureSet</a>();</div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span>&#160; }</div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span>&#160;</div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span>&#160; <span class="keywordtype">float</span> prev = <a class="code" href="classZeroCrossing.html#a0f2d9f2cab0a8a30344e1f2c0ebb8ee8">m_previousSample</a>;</div><div class="line"><a name="l00154"></a><span class="lineno"> 154</span>&#160; <span class="keywordtype">size_t</span> count = 0;</div><div class="line"><a name="l00155"></a><span class="lineno"> 155</span>&#160;</div><div class="line"><a name="l00156"></a><span class="lineno"> 156</span>&#160; <a class="code" href="classVamp_1_1Plugin.html#a448fb57dc245d47923ec9eeaf9856c5f">FeatureSet</a> returnFeatures;</div><div class="line"><a name="l00157"></a><span class="lineno"> 157</span>&#160;</div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span>&#160; <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i &lt; <a class="code" href="classZeroCrossing.html#a584f100b87c78f9af9da040d79567d52">m_stepSize</a>; ++i) {</div><div class="line"><a name="l00159"></a><span class="lineno"> 159</span>&#160;</div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span>&#160; <span class="keywordtype">float</span> sample = inputBuffers[0][i];</div><div class="line"><a name="l00161"></a><span class="lineno"> 161</span>&#160; <span class="keywordtype">bool</span> crossing = <span class="keyword">false</span>;</div><div class="line"><a name="l00162"></a><span class="lineno"> 162</span>&#160;</div><div class="line"><a name="l00163"></a><span class="lineno"> 163</span>&#160; <span class="keywordflow">if</span> (sample &lt;= 0.0) {</div><div class="line"><a name="l00164"></a><span class="lineno"> 164</span>&#160; <span class="keywordflow">if</span> (prev &gt; 0.0) crossing = <span class="keyword">true</span>;</div><div class="line"><a name="l00165"></a><span class="lineno"> 165</span>&#160; } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (sample &gt; 0.0) {</div><div class="line"><a name="l00166"></a><span class="lineno"> 166</span>&#160; <span class="keywordflow">if</span> (prev &lt;= 0.0) crossing = <span class="keyword">true</span>;</div><div class="line"><a name="l00167"></a><span class="lineno"> 167</span>&#160; }</div><div class="line"><a name="l00168"></a><span class="lineno"> 168</span>&#160;</div><div class="line"><a name="l00169"></a><span class="lineno"> 169</span>&#160; <span class="keywordflow">if</span> (crossing) {</div><div class="line"><a name="l00170"></a><span class="lineno"> 170</span>&#160; ++count; </div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span>&#160; <a class="code" href="structVamp_1_1Plugin_1_1Feature.html">Feature</a> feature;</div><div class="line"><a name="l00172"></a><span class="lineno"> 172</span>&#160; feature.<a class="code" href="structVamp_1_1Plugin_1_1Feature.html#a98907091d0b6a589720ae35ae588a82b">hasTimestamp</a> = <span class="keyword">true</span>;</div><div class="line"><a name="l00173"></a><span class="lineno"> 173</span>&#160; feature.<a class="code" href="structVamp_1_1Plugin_1_1Feature.html#acaa605f36839c07e76f4882f5e22d8d7">timestamp</a> = timestamp +</div><div class="line"><a name="l00174"></a><span class="lineno"> 174</span>&#160; <a class="code" href="structVamp_1_1RealTime.html#a939b4b1d1ca190db69a418883f16ce8a">Vamp::RealTime::frame2RealTime</a>(i, (<span class="keywordtype">size_t</span>)<a class="code" href="classVamp_1_1Plugin.html#a59b9dd82a4f4eb946cd0474cc81abc23">m_inputSampleRate</a>);</div><div class="line"><a name="l00175"></a><span class="lineno"> 175</span>&#160; returnFeatures[1].push_back(feature);</div><div class="line"><a name="l00176"></a><span class="lineno"> 176</span>&#160; }</div><div class="line"><a name="l00177"></a><span class="lineno"> 177</span>&#160;</div><div class="line"><a name="l00178"></a><span class="lineno"> 178</span>&#160; prev = sample;</div><div class="line"><a name="l00179"></a><span class="lineno"> 179</span>&#160; }</div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span>&#160;</div><div class="line"><a name="l00181"></a><span class="lineno"> 181</span>&#160; <a class="code" href="classZeroCrossing.html#a0f2d9f2cab0a8a30344e1f2c0ebb8ee8">m_previousSample</a> = prev;</div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span>&#160;</div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span>&#160; <a class="code" href="structVamp_1_1Plugin_1_1Feature.html">Feature</a> feature;</div><div class="line"><a name="l00184"></a><span class="lineno"> 184</span>&#160; feature.<a class="code" href="structVamp_1_1Plugin_1_1Feature.html#a98907091d0b6a589720ae35ae588a82b">hasTimestamp</a> = <span class="keyword">false</span>;</div><div class="line"><a name="l00185"></a><span class="lineno"> 185</span>&#160; feature.<a class="code" href="structVamp_1_1Plugin_1_1Feature.html#a60b9f3057386820dbcaec0eb1189ce71">values</a>.push_back(<span class="keywordtype">float</span>(count));</div><div class="line"><a name="l00186"></a><span class="lineno"> 186</span>&#160;</div><div class="line"><a name="l00187"></a><span class="lineno"> 187</span>&#160; returnFeatures[0].push_back(feature);</div><div class="line"><a name="l00188"></a><span class="lineno"> 188</span>&#160; <span class="keywordflow">return</span> returnFeatures;</div><div class="line"><a name="l00189"></a><span class="lineno"> 189</span>&#160;}</div><div class="line"><a name="l00190"></a><span class="lineno"> 190</span>&#160;</div><div class="line"><a name="l00191"></a><span class="lineno"> 191</span>&#160;<a class="code" href="classVamp_1_1Plugin.html#a448fb57dc245d47923ec9eeaf9856c5f">ZeroCrossing::FeatureSet</a></div><div class="line"><a name="l00192"></a><span class="lineno"><a class="line" href="classZeroCrossing.html#a70996d1b7166e303903daf92a9a37ad8"> 192</a></span>&#160;<a class="code" href="classZeroCrossing.html#a70996d1b7166e303903daf92a9a37ad8">ZeroCrossing::getRemainingFeatures</a>()</div><div class="line"><a name="l00193"></a><span class="lineno"> 193</span>&#160;{</div><div class="line"><a name="l00194"></a><span class="lineno"> 194</span>&#160; <span class="keywordflow">return</span> <a class="code" href="classVamp_1_1Plugin.html#a448fb57dc245d47923ec9eeaf9856c5f">FeatureSet</a>();</div><div class="line"><a name="l00195"></a><span class="lineno"> 195</span>&#160;}</div><div class="line"><a name="l00196"></a><span class="lineno"> 196</span>&#160;</div><div class="ttc" id="classVamp_1_1Plugin_html_a30f531b8fb69fac41a24e3d2a6a08ed9"><div class="ttname"><a href="classVamp_1_1Plugin.html#a30f531b8fb69fac41a24e3d2a6a08ed9">Vamp::Plugin::OutputList</a></div><div class="ttdeci">std::vector&lt; OutputDescriptor &gt; OutputList</div><div class="ttdef"><b>Definition:</b> <a href="vamp-sdk_2Plugin_8h_source.html#l00335">vamp-sdk/Plugin.h:335</a></div></div>
80 <a name="l00002"></a>00002 67 <div class="ttc" id="classZeroCrossing_html_abf4aaa6fd8cc03de63f4e1e8942633da"><div class="ttname"><a href="classZeroCrossing.html#abf4aaa6fd8cc03de63f4e1e8942633da">ZeroCrossing::process</a></div><div class="ttdeci">FeatureSet process(const float *const *inputBuffers, Vamp::RealTime timestamp)</div><div class="ttdoc">Process a single block of input data. </div><div class="ttdef"><b>Definition:</b> <a href="ZeroCrossing_8cpp_source.html#l00143">ZeroCrossing.cpp:143</a></div></div>
81 <a name="l00003"></a>00003 <span class="comment">/*</span> 68 <div class="ttc" id="structVamp_1_1Plugin_1_1OutputDescriptor_html"><div class="ttname"><a href="structVamp_1_1Plugin_1_1OutputDescriptor.html">Vamp::Plugin::OutputDescriptor</a></div><div class="ttdef"><b>Definition:</b> <a href="vamp-sdk_2Plugin_8h_source.html#l00206">vamp-sdk/Plugin.h:206</a></div></div>
82 <a name="l00004"></a>00004 <span class="comment"> Vamp</span> 69 <div class="ttc" id="structVamp_1_1Plugin_1_1OutputDescriptor_html_add0cbbdfa9c91764037c39365b1d42af"><div class="ttname"><a href="structVamp_1_1Plugin_1_1OutputDescriptor.html#add0cbbdfa9c91764037c39365b1d42af">Vamp::Plugin::OutputDescriptor::sampleRate</a></div><div class="ttdeci">float sampleRate</div><div class="ttdoc">Sample rate of the output results, as samples per second. </div><div class="ttdef"><b>Definition:</b> <a href="vamp-sdk_2Plugin_8h_source.html#l00314">vamp-sdk/Plugin.h:314</a></div></div>
83 <a name="l00005"></a>00005 <span class="comment"></span> 70 <div class="ttc" id="classZeroCrossing_html_ab83cfab3f9674920e295c2f3571bb24e"><div class="ttname"><a href="classZeroCrossing.html#ab83cfab3f9674920e295c2f3571bb24e">ZeroCrossing::getOutputDescriptors</a></div><div class="ttdeci">OutputList getOutputDescriptors() const</div><div class="ttdoc">Get the outputs of this plugin. </div><div class="ttdef"><b>Definition:</b> <a href="ZeroCrossing_8cpp_source.html#l00112">ZeroCrossing.cpp:112</a></div></div>
84 <a name="l00006"></a>00006 <span class="comment"> An API for audio analysis and feature extraction plugins.</span> 71 <div class="ttc" id="structVamp_1_1Plugin_1_1OutputDescriptor_html_af0e577e1a256ff6eed6ea42133fec77d"><div class="ttname"><a href="structVamp_1_1Plugin_1_1OutputDescriptor.html#af0e577e1a256ff6eed6ea42133fec77d">Vamp::Plugin::OutputDescriptor::hasFixedBinCount</a></div><div class="ttdeci">bool hasFixedBinCount</div><div class="ttdoc">True if the output has the same number of values per sample for every output sample. </div><div class="ttdef"><b>Definition:</b> <a href="vamp-sdk_2Plugin_8h_source.html#l00239">vamp-sdk/Plugin.h:239</a></div></div>
85 <a name="l00007"></a>00007 <span class="comment"></span> 72 <div class="ttc" id="structVamp_1_1Plugin_1_1Feature_html_a60b9f3057386820dbcaec0eb1189ce71"><div class="ttname"><a href="structVamp_1_1Plugin_1_1Feature.html#a60b9f3057386820dbcaec0eb1189ce71">Vamp::Plugin::Feature::values</a></div><div class="ttdeci">std::vector&lt; float &gt; values</div><div class="ttdoc">Results for a single sample of this feature. </div><div class="ttdef"><b>Definition:</b> <a href="vamp-sdk_2Plugin_8h_source.html#l00382">vamp-sdk/Plugin.h:382</a></div></div>
86 <a name="l00008"></a>00008 <span class="comment"> Centre for Digital Music, Queen Mary, University of London.</span> 73 <div class="ttc" id="classZeroCrossing_html_af21bbcc87a6eb7875dfab7d86222dccc"><div class="ttname"><a href="classZeroCrossing.html#af21bbcc87a6eb7875dfab7d86222dccc">ZeroCrossing::initialise</a></div><div class="ttdeci">bool initialise(size_t channels, size_t stepSize, size_t blockSize)</div><div class="ttdoc">Initialise a plugin to prepare it for use with the given number of input channels, step size (window increment, in sample frames) and block size (window size, in sample frames). </div><div class="ttdef"><b>Definition:</b> <a href="ZeroCrossing_8cpp_source.html#l00095">ZeroCrossing.cpp:95</a></div></div>
87 <a name="l00009"></a>00009 <span class="comment"> Copyright 2006 Chris Cannam.</span> 74 <div class="ttc" id="classVamp_1_1Plugin_html_a448fb57dc245d47923ec9eeaf9856c5f"><div class="ttname"><a href="classVamp_1_1Plugin.html#a448fb57dc245d47923ec9eeaf9856c5f">Vamp::Plugin::FeatureSet</a></div><div class="ttdeci">std::map&lt; int, FeatureList &gt; FeatureSet</div><div class="ttdef"><b>Definition:</b> <a href="vamp-sdk_2Plugin_8h_source.html#l00395">vamp-sdk/Plugin.h:395</a></div></div>
88 <a name="l00010"></a>00010 <span class="comment"> </span> 75 <div class="ttc" id="classZeroCrossing_html_a584f100b87c78f9af9da040d79567d52"><div class="ttname"><a href="classZeroCrossing.html#a584f100b87c78f9af9da040d79567d52">ZeroCrossing::m_stepSize</a></div><div class="ttdeci">size_t m_stepSize</div><div class="ttdef"><b>Definition:</b> <a href="ZeroCrossing_8h_source.html#l00073">ZeroCrossing.h:73</a></div></div>
89 <a name="l00011"></a>00011 <span class="comment"> Permission is hereby granted, free of charge, to any person</span> 76 <div class="ttc" id="structVamp_1_1Plugin_1_1OutputDescriptor_html_a3bed37153067b625b95acb40b60dbf0b"><div class="ttname"><a href="structVamp_1_1Plugin_1_1OutputDescriptor.html#a3bed37153067b625b95acb40b60dbf0b">Vamp::Plugin::OutputDescriptor::quantizeStep</a></div><div class="ttdeci">float quantizeStep</div><div class="ttdoc">Quantization resolution of the output values (e.g. </div><div class="ttdef"><b>Definition:</b> <a href="vamp-sdk_2Plugin_8h_source.html#l00285">vamp-sdk/Plugin.h:285</a></div></div>
90 <a name="l00012"></a>00012 <span class="comment"> obtaining a copy of this software and associated documentation</span> 77 <div class="ttc" id="classZeroCrossing_html_a70996d1b7166e303903daf92a9a37ad8"><div class="ttname"><a href="classZeroCrossing.html#a70996d1b7166e303903daf92a9a37ad8">ZeroCrossing::getRemainingFeatures</a></div><div class="ttdeci">FeatureSet getRemainingFeatures()</div><div class="ttdoc">After all blocks have been processed, calculate and return any remaining features derived from the co...</div><div class="ttdef"><b>Definition:</b> <a href="ZeroCrossing_8cpp_source.html#l00192">ZeroCrossing.cpp:192</a></div></div>
91 <a name="l00013"></a>00013 <span class="comment"> files (the &quot;Software&quot;), to deal in the Software without</span> 78 <div class="ttc" id="structVamp_1_1Plugin_1_1Feature_html_acaa605f36839c07e76f4882f5e22d8d7"><div class="ttname"><a href="structVamp_1_1Plugin_1_1Feature.html#acaa605f36839c07e76f4882f5e22d8d7">Vamp::Plugin::Feature::timestamp</a></div><div class="ttdeci">RealTime timestamp</div><div class="ttdoc">Timestamp of the output feature. </div><div class="ttdef"><b>Definition:</b> <a href="vamp-sdk_2Plugin_8h_source.html#l00360">vamp-sdk/Plugin.h:360</a></div></div>
92 <a name="l00014"></a>00014 <span class="comment"> restriction, including without limitation the rights to use, copy,</span> 79 <div class="ttc" id="structVamp_1_1Plugin_1_1OutputDescriptor_html_af9b4fe8f78e7126ead820ba5dc55efd1"><div class="ttname"><a href="structVamp_1_1Plugin_1_1OutputDescriptor.html#af9b4fe8f78e7126ead820ba5dc55efd1">Vamp::Plugin::OutputDescriptor::description</a></div><div class="ttdeci">std::string description</div><div class="ttdoc">A human-readable short text describing the output. </div><div class="ttdef"><b>Definition:</b> <a href="vamp-sdk_2Plugin_8h_source.html#l00227">vamp-sdk/Plugin.h:227</a></div></div>
93 <a name="l00015"></a>00015 <span class="comment"> modify, merge, publish, distribute, sublicense, and/or sell copies</span> 80 <div class="ttc" id="classZeroCrossing_html_a9ae6c4a31ea027dceb1e97ead807e228"><div class="ttname"><a href="classZeroCrossing.html#a9ae6c4a31ea027dceb1e97ead807e228">ZeroCrossing::reset</a></div><div class="ttdeci">void reset()</div><div class="ttdoc">Reset the plugin after use, to prepare it for another clean run. </div><div class="ttdef"><b>Definition:</b> <a href="ZeroCrossing_8cpp_source.html#l00106">ZeroCrossing.cpp:106</a></div></div>
94 <a name="l00016"></a>00016 <span class="comment"> of the Software, and to permit persons to whom the Software is</span> 81 <div class="ttc" id="structVamp_1_1Plugin_1_1OutputDescriptor_html_ae2c893ddb1860589517ab7eaa989a18b"><div class="ttname"><a href="structVamp_1_1Plugin_1_1OutputDescriptor.html#ae2c893ddb1860589517ab7eaa989a18b">Vamp::Plugin::OutputDescriptor::identifier</a></div><div class="ttdeci">std::string identifier</div><div class="ttdoc">The name of the output, in computer-usable form. </div><div class="ttdef"><b>Definition:</b> <a href="vamp-sdk_2Plugin_8h_source.html#l00214">vamp-sdk/Plugin.h:214</a></div></div>
95 <a name="l00017"></a>00017 <span class="comment"> furnished to do so, subject to the following conditions:</span> 82 <div class="ttc" id="structVamp_1_1Plugin_1_1Feature_html"><div class="ttname"><a href="structVamp_1_1Plugin_1_1Feature.html">Vamp::Plugin::Feature</a></div><div class="ttdef"><b>Definition:</b> <a href="vamp-sdk_2Plugin_8h_source.html#l00344">vamp-sdk/Plugin.h:344</a></div></div>
96 <a name="l00018"></a>00018 <span class="comment"></span> 83 <div class="ttc" id="classVamp_1_1Plugin_html_a59b9dd82a4f4eb946cd0474cc81abc23"><div class="ttname"><a href="classVamp_1_1Plugin.html#a59b9dd82a4f4eb946cd0474cc81abc23">Vamp::Plugin::m_inputSampleRate</a></div><div class="ttdeci">float m_inputSampleRate</div><div class="ttdef"><b>Definition:</b> <a href="vamp-sdk_2Plugin_8h_source.html#l00444">vamp-sdk/Plugin.h:444</a></div></div>
97 <a name="l00019"></a>00019 <span class="comment"> The above copyright notice and this permission notice shall be</span> 84 <div class="ttc" id="classZeroCrossing_html_af5049a01a3f003f17a45c61b599c6543"><div class="ttname"><a href="classZeroCrossing.html#af5049a01a3f003f17a45c61b599c6543">ZeroCrossing::getIdentifier</a></div><div class="ttdeci">std::string getIdentifier() const</div><div class="ttdoc">Get the computer-usable name of the plugin. </div><div class="ttdef"><b>Definition:</b> <a href="ZeroCrossing_8cpp_source.html#l00059">ZeroCrossing.cpp:59</a></div></div>
98 <a name="l00020"></a>00020 <span class="comment"> included in all copies or substantial portions of the Software.</span> 85 <div class="ttc" id="classZeroCrossing_html_af1de0da862e6e2443581e4e16044675b"><div class="ttname"><a href="classZeroCrossing.html#af1de0da862e6e2443581e4e16044675b">ZeroCrossing::~ZeroCrossing</a></div><div class="ttdeci">virtual ~ZeroCrossing()</div><div class="ttdef"><b>Definition:</b> <a href="ZeroCrossing_8cpp_source.html#l00054">ZeroCrossing.cpp:54</a></div></div>
99 <a name="l00021"></a>00021 <span class="comment"></span> 86 <div class="ttc" id="classZeroCrossing_html_a9855153a54bdc9ba75cc1a705a149473"><div class="ttname"><a href="classZeroCrossing.html#a9855153a54bdc9ba75cc1a705a149473">ZeroCrossing::ZeroCrossing</a></div><div class="ttdeci">ZeroCrossing(float inputSampleRate)</div><div class="ttdef"><b>Definition:</b> <a href="ZeroCrossing_8cpp_source.html#l00047">ZeroCrossing.cpp:47</a></div></div>
100 <a name="l00022"></a>00022 <span class="comment"> THE SOFTWARE IS PROVIDED &quot;AS IS&quot;, WITHOUT WARRANTY OF ANY KIND,</span> 87 <div class="ttc" id="structVamp_1_1Plugin_1_1OutputDescriptor_html_aa057a8833fa037f06ac9f7b85b85d5e4"><div class="ttname"><a href="structVamp_1_1Plugin_1_1OutputDescriptor.html#aa057a8833fa037f06ac9f7b85b85d5e4">Vamp::Plugin::OutputDescriptor::unit</a></div><div class="ttdeci">std::string unit</div><div class="ttdoc">The unit of the output, in human-readable form. </div><div class="ttdef"><b>Definition:</b> <a href="vamp-sdk_2Plugin_8h_source.html#l00232">vamp-sdk/Plugin.h:232</a></div></div>
101 <a name="l00023"></a>00023 <span class="comment"> EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF</span> 88 <div class="ttc" id="classVamp_1_1Plugin_html_ab74f7634c6ac6e3da115667808a79c30"><div class="ttname"><a href="classVamp_1_1Plugin.html#ab74f7634c6ac6e3da115667808a79c30">Vamp::Plugin::getMinChannelCount</a></div><div class="ttdeci">virtual size_t getMinChannelCount() const</div><div class="ttdoc">Get the minimum supported number of input channels. </div><div class="ttdef"><b>Definition:</b> <a href="vamp-sdk_2Plugin_8h_source.html#l00199">vamp-sdk/Plugin.h:199</a></div></div>
102 <a name="l00024"></a>00024 <span class="comment"> MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND</span> 89 <div class="ttc" id="structVamp_1_1Plugin_1_1OutputDescriptor_html_ab824b2b34ee50f897a30901c620e8d87"><div class="ttname"><a href="structVamp_1_1Plugin_1_1OutputDescriptor.html#ab824b2b34ee50f897a30901c620e8d87">Vamp::Plugin::OutputDescriptor::name</a></div><div class="ttdeci">std::string name</div><div class="ttdoc">The human-readable name of the output. </div><div class="ttdef"><b>Definition:</b> <a href="vamp-sdk_2Plugin_8h_source.html#l00220">vamp-sdk/Plugin.h:220</a></div></div>
103 <a name="l00025"></a>00025 <span class="comment"> NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR</span> 90 <div class="ttc" id="ZeroCrossing_8h_html"><div class="ttname"><a href="ZeroCrossing_8h.html">ZeroCrossing.h</a></div></div>
104 <a name="l00026"></a>00026 <span class="comment"> ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF</span> 91 <div class="ttc" id="classVamp_1_1Plugin_html_a0bff9464bc8c117470136c396b2405dd"><div class="ttname"><a href="classVamp_1_1Plugin.html#a0bff9464bc8c117470136c396b2405dd">Vamp::Plugin::getMaxChannelCount</a></div><div class="ttdeci">virtual size_t getMaxChannelCount() const</div><div class="ttdoc">Get the maximum supported number of input channels. </div><div class="ttdef"><b>Definition:</b> <a href="vamp-sdk_2Plugin_8h_source.html#l00204">vamp-sdk/Plugin.h:204</a></div></div>
105 <a name="l00027"></a>00027 <span class="comment"> CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION</span> 92 <div class="ttc" id="structVamp_1_1RealTime_html"><div class="ttname"><a href="structVamp_1_1RealTime.html">Vamp::RealTime</a></div><div class="ttdoc">RealTime represents time values to nanosecond precision with accurate arithmetic and frame-rate conve...</div><div class="ttdef"><b>Definition:</b> <a href="vamp-sdk_2RealTime_8h_source.html#l00066">vamp-sdk/RealTime.h:66</a></div></div>
106 <a name="l00028"></a>00028 <span class="comment"> WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.</span> 93 <div class="ttc" id="structVamp_1_1Plugin_1_1Feature_html_a98907091d0b6a589720ae35ae588a82b"><div class="ttname"><a href="structVamp_1_1Plugin_1_1Feature.html#a98907091d0b6a589720ae35ae588a82b">Vamp::Plugin::Feature::hasTimestamp</a></div><div class="ttdeci">bool hasTimestamp</div><div class="ttdoc">True if an output feature has its own timestamp. </div><div class="ttdef"><b>Definition:</b> <a href="vamp-sdk_2Plugin_8h_source.html#l00352">vamp-sdk/Plugin.h:352</a></div></div>
107 <a name="l00029"></a>00029 <span class="comment"></span> 94 <div class="ttc" id="classZeroCrossing_html_a4199350192d84a4ec5f379805cd3e7cf"><div class="ttname"><a href="classZeroCrossing.html#a4199350192d84a4ec5f379805cd3e7cf">ZeroCrossing::getPluginVersion</a></div><div class="ttdeci">int getPluginVersion() const</div><div class="ttdoc">Get the version number of the plugin. </div><div class="ttdef"><b>Definition:</b> <a href="ZeroCrossing_8cpp_source.html#l00083">ZeroCrossing.cpp:83</a></div></div>
108 <a name="l00030"></a>00030 <span class="comment"> Except as contained in this notice, the names of the Centre for</span> 95 <div class="ttc" id="classZeroCrossing_html_a9ddf295d977b6c64d8acd34b7e0ce1b0"><div class="ttname"><a href="classZeroCrossing.html#a9ddf295d977b6c64d8acd34b7e0ce1b0">ZeroCrossing::getMaker</a></div><div class="ttdeci">std::string getMaker() const</div><div class="ttdoc">Get the name of the author or vendor of the plugin in human-readable form. </div><div class="ttdef"><b>Definition:</b> <a href="ZeroCrossing_8cpp_source.html#l00077">ZeroCrossing.cpp:77</a></div></div>
109 <a name="l00031"></a>00031 <span class="comment"> Digital Music; Queen Mary, University of London; and Chris Cannam</span> 96 <div class="ttc" id="structVamp_1_1RealTime_html_a939b4b1d1ca190db69a418883f16ce8a"><div class="ttname"><a href="structVamp_1_1RealTime.html#a939b4b1d1ca190db69a418883f16ce8a">Vamp::RealTime::frame2RealTime</a></div><div class="ttdeci">static RealTime frame2RealTime(long frame, unsigned int sampleRate)</div><div class="ttdoc">Convert a sample frame at the given sample rate into a RealTime. </div></div>
110 <a name="l00032"></a>00032 <span class="comment"> shall not be used in advertising or otherwise to promote the sale,</span> 97 <div class="ttc" id="classZeroCrossing_html_af955fb85b26a5497690aecbd288975f2"><div class="ttname"><a href="classZeroCrossing.html#af955fb85b26a5497690aecbd288975f2">ZeroCrossing::getCopyright</a></div><div class="ttdeci">std::string getCopyright() const</div><div class="ttdoc">Get the copyright statement or licensing summary for the plugin. </div><div class="ttdef"><b>Definition:</b> <a href="ZeroCrossing_8cpp_source.html#l00089">ZeroCrossing.cpp:89</a></div></div>
111 <a name="l00033"></a>00033 <span class="comment"> use or other dealings in this Software without prior written</span> 98 <div class="ttc" id="classZeroCrossing_html_a191365f793e6488d02d57029eb14deb2"><div class="ttname"><a href="classZeroCrossing.html#a191365f793e6488d02d57029eb14deb2">ZeroCrossing::getName</a></div><div class="ttdeci">std::string getName() const</div><div class="ttdoc">Get a human-readable name or title of the plugin. </div><div class="ttdef"><b>Definition:</b> <a href="ZeroCrossing_8cpp_source.html#l00065">ZeroCrossing.cpp:65</a></div></div>
112 <a name="l00034"></a>00034 <span class="comment"> authorization.</span> 99 <div class="ttc" id="classZeroCrossing_html_a7ba1cfd102a427f8333ddfa2fe234d58"><div class="ttname"><a href="classZeroCrossing.html#a7ba1cfd102a427f8333ddfa2fe234d58">ZeroCrossing::getDescription</a></div><div class="ttdeci">std::string getDescription() const</div><div class="ttdoc">Get a human-readable description for the plugin, typically a line of text that may optionally be disp...</div><div class="ttdef"><b>Definition:</b> <a href="ZeroCrossing_8cpp_source.html#l00071">ZeroCrossing.cpp:71</a></div></div>
113 <a name="l00035"></a>00035 <span class="comment">*/</span> 100 <div class="ttc" id="structVamp_1_1Plugin_1_1OutputDescriptor_html_abffa9ed50cd756df70fd51f0355f448ca0459d5d0d2198d21e8bc90abe4fdccca"><div class="ttname"><a href="structVamp_1_1Plugin_1_1OutputDescriptor.html#abffa9ed50cd756df70fd51f0355f448ca0459d5d0d2198d21e8bc90abe4fdccca">Vamp::Plugin::OutputDescriptor::OneSamplePerStep</a></div><div class="ttdoc">Results from each process() align with that call&amp;#39;s block start. </div><div class="ttdef"><b>Definition:</b> <a href="vamp-sdk_2Plugin_8h_source.html#l00290">vamp-sdk/Plugin.h:290</a></div></div>
114 <a name="l00036"></a>00036 101 <div class="ttc" id="structVamp_1_1Plugin_1_1OutputDescriptor_html_afdd006959a995e40ef7d565a3a4df6dc"><div class="ttname"><a href="structVamp_1_1Plugin_1_1OutputDescriptor.html#afdd006959a995e40ef7d565a3a4df6dc">Vamp::Plugin::OutputDescriptor::binCount</a></div><div class="ttdeci">size_t binCount</div><div class="ttdoc">The number of values per result of the output. </div><div class="ttdef"><b>Definition:</b> <a href="vamp-sdk_2Plugin_8h_source.html#l00247">vamp-sdk/Plugin.h:247</a></div></div>
115 <a name="l00037"></a>00037 <span class="preprocessor">#include &quot;<a class="code" href="ZeroCrossing_8h.html">ZeroCrossing.h</a>&quot;</span> 102 <div class="ttc" id="classZeroCrossing_html_a0f2d9f2cab0a8a30344e1f2c0ebb8ee8"><div class="ttname"><a href="classZeroCrossing.html#a0f2d9f2cab0a8a30344e1f2c0ebb8ee8">ZeroCrossing::m_previousSample</a></div><div class="ttdeci">float m_previousSample</div><div class="ttdef"><b>Definition:</b> <a href="ZeroCrossing_8h_source.html#l00074">ZeroCrossing.h:74</a></div></div>
116 <a name="l00038"></a>00038 103 <div class="ttc" id="structVamp_1_1Plugin_1_1OutputDescriptor_html_a1b4858928d23bfd7d5bc557c82a83fb4"><div class="ttname"><a href="structVamp_1_1Plugin_1_1OutputDescriptor.html#a1b4858928d23bfd7d5bc557c82a83fb4">Vamp::Plugin::OutputDescriptor::isQuantized</a></div><div class="ttdeci">bool isQuantized</div><div class="ttdoc">True if the output values are quantized to a particular resolution. </div><div class="ttdef"><b>Definition:</b> <a href="vamp-sdk_2Plugin_8h_source.html#l00278">vamp-sdk/Plugin.h:278</a></div></div>
117 <a name="l00039"></a>00039 <span class="keyword">using</span> std::string; 104 <div class="ttc" id="structVamp_1_1Plugin_1_1OutputDescriptor_html_a0d1194980d44e31b25ef3b4b070d6b5d"><div class="ttname"><a href="structVamp_1_1Plugin_1_1OutputDescriptor.html#a0d1194980d44e31b25ef3b4b070d6b5d">Vamp::Plugin::OutputDescriptor::sampleType</a></div><div class="ttdeci">SampleType sampleType</div><div class="ttdoc">Positioning in time of the output results. </div><div class="ttdef"><b>Definition:</b> <a href="vamp-sdk_2Plugin_8h_source.html#l00302">vamp-sdk/Plugin.h:302</a></div></div>
118 <a name="l00040"></a>00040 <span class="keyword">using</span> std::vector; 105 <div class="ttc" id="structVamp_1_1Plugin_1_1OutputDescriptor_html_abffa9ed50cd756df70fd51f0355f448cadea995a737867f7b22b52f1c43c5432e"><div class="ttname"><a href="structVamp_1_1Plugin_1_1OutputDescriptor.html#abffa9ed50cd756df70fd51f0355f448cadea995a737867f7b22b52f1c43c5432e">Vamp::Plugin::OutputDescriptor::VariableSampleRate</a></div><div class="ttdoc">Results are unevenly spaced and have individual timestamps. </div><div class="ttdef"><b>Definition:</b> <a href="vamp-sdk_2Plugin_8h_source.html#l00296">vamp-sdk/Plugin.h:296</a></div></div>
119 <a name="l00041"></a>00041 <span class="keyword">using</span> std::cerr; 106 <div class="ttc" id="structVamp_1_1Plugin_1_1OutputDescriptor_html_ae9ccb65f99f477096b65dd031f4c5e31"><div class="ttname"><a href="structVamp_1_1Plugin_1_1OutputDescriptor.html#ae9ccb65f99f477096b65dd031f4c5e31">Vamp::Plugin::OutputDescriptor::hasKnownExtents</a></div><div class="ttdeci">bool hasKnownExtents</div><div class="ttdoc">True if the results in each output bin fall within a fixed numeric range (minimum and maximum values)...</div><div class="ttdef"><b>Definition:</b> <a href="vamp-sdk_2Plugin_8h_source.html#l00260">vamp-sdk/Plugin.h:260</a></div></div>
120 <a name="l00042"></a>00042 <span class="keyword">using</span> std::endl; 107 </div><!-- fragment --></div><!-- contents -->
121 <a name="l00043"></a>00043 108 </div><!-- doc-content -->
122 <a name="l00044"></a>00044 <span class="preprocessor">#include &lt;cmath&gt;</span> 109 <!-- start footer part -->
123 <a name="l00045"></a>00045 110 <div id="nav-path" class="navpath"><!-- id is needed for treeview function! -->
124 <a name="l00046"></a><a class="code" href="classZeroCrossing.html#a9855153a54bdc9ba75cc1a705a149473">00046</a> <a class="code" href="classZeroCrossing.html#a9855153a54bdc9ba75cc1a705a149473">ZeroCrossing::ZeroCrossing</a>(<span class="keywordtype">float</span> inputSampleRate) : 111 <ul>
125 <a name="l00047"></a>00047 Plugin(inputSampleRate), 112 <li class="navelem"><a class="el" href="dir_d28a4824dc47e487b107a5db32ef43c4.html">examples</a></li><li class="navelem"><a class="el" href="ZeroCrossing_8cpp.html">ZeroCrossing.cpp</a></li>
126 <a name="l00048"></a>00048 m_stepSize(0), 113 <li class="footer">Generated by
127 <a name="l00049"></a>00049 m_previousSample(0.0f) 114 <a href="http://www.doxygen.org/index.html">
128 <a name="l00050"></a>00050 { 115 <img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.8.13 </li>
129 <a name="l00051"></a>00051 } 116 </ul>
130 <a name="l00052"></a>00052
131 <a name="l00053"></a><a class="code" href="classZeroCrossing.html#af1de0da862e6e2443581e4e16044675b">00053</a> <a class="code" href="classZeroCrossing.html#af1de0da862e6e2443581e4e16044675b">ZeroCrossing::~ZeroCrossing</a>()
132 <a name="l00054"></a>00054 {
133 <a name="l00055"></a>00055 }
134 <a name="l00056"></a>00056
135 <a name="l00057"></a>00057 <span class="keywordtype">string</span>
136 <a name="l00058"></a><a class="code" href="classZeroCrossing.html#af2baf9e19fcdd11cfe97ace56d4f5c1a">00058</a> <a class="code" href="classZeroCrossing.html#af2baf9e19fcdd11cfe97ace56d4f5c1a" title="Get the computer-usable name of the plugin.">ZeroCrossing::getIdentifier</a>()<span class="keyword"> const</span>
137 <a name="l00059"></a>00059 <span class="keyword"></span>{
138 <a name="l00060"></a>00060 <span class="keywordflow">return</span> <span class="stringliteral">&quot;zerocrossing&quot;</span>;
139 <a name="l00061"></a>00061 }
140 <a name="l00062"></a>00062
141 <a name="l00063"></a>00063 <span class="keywordtype">string</span>
142 <a name="l00064"></a><a class="code" href="classZeroCrossing.html#afa96f7ce6e7d9f03768f48c6a9d88498">00064</a> <a class="code" href="classZeroCrossing.html#afa96f7ce6e7d9f03768f48c6a9d88498" title="Get a human-readable name or title of the plugin.">ZeroCrossing::getName</a>()<span class="keyword"> const</span>
143 <a name="l00065"></a>00065 <span class="keyword"></span>{
144 <a name="l00066"></a>00066 <span class="keywordflow">return</span> <span class="stringliteral">&quot;Zero Crossings&quot;</span>;
145 <a name="l00067"></a>00067 }
146 <a name="l00068"></a>00068
147 <a name="l00069"></a>00069 <span class="keywordtype">string</span>
148 <a name="l00070"></a><a class="code" href="classZeroCrossing.html#a710bb0b013157adaeef2a9e6867b4478">00070</a> <a class="code" href="classZeroCrossing.html#a710bb0b013157adaeef2a9e6867b4478" title="Get a human-readable description for the plugin, typically a line of text that may optionally be disp...">ZeroCrossing::getDescription</a>()<span class="keyword"> const</span>
149 <a name="l00071"></a>00071 <span class="keyword"></span>{
150 <a name="l00072"></a>00072 <span class="keywordflow">return</span> <span class="stringliteral">&quot;Detect and count zero crossing points&quot;</span>;
151 <a name="l00073"></a>00073 }
152 <a name="l00074"></a>00074
153 <a name="l00075"></a>00075 <span class="keywordtype">string</span>
154 <a name="l00076"></a><a class="code" href="classZeroCrossing.html#ac68561634a3c329a029c2fd3deaeae2a">00076</a> <a class="code" href="classZeroCrossing.html#ac68561634a3c329a029c2fd3deaeae2a" title="Get the name of the author or vendor of the plugin in human-readable form.">ZeroCrossing::getMaker</a>()<span class="keyword"> const</span>
155 <a name="l00077"></a>00077 <span class="keyword"></span>{
156 <a name="l00078"></a>00078 <span class="keywordflow">return</span> <span class="stringliteral">&quot;Vamp SDK Example Plugins&quot;</span>;
157 <a name="l00079"></a>00079 }
158 <a name="l00080"></a>00080
159 <a name="l00081"></a>00081 <span class="keywordtype">int</span>
160 <a name="l00082"></a><a class="code" href="classZeroCrossing.html#ad685f6c2f443f07a1634550c335571eb">00082</a> <a class="code" href="classZeroCrossing.html#ad685f6c2f443f07a1634550c335571eb" title="Get the version number of the plugin.">ZeroCrossing::getPluginVersion</a>()<span class="keyword"> const</span>
161 <a name="l00083"></a>00083 <span class="keyword"></span>{
162 <a name="l00084"></a>00084 <span class="keywordflow">return</span> 2;
163 <a name="l00085"></a>00085 }
164 <a name="l00086"></a>00086
165 <a name="l00087"></a>00087 <span class="keywordtype">string</span>
166 <a name="l00088"></a><a class="code" href="classZeroCrossing.html#af9c41b92aa8ff8bddaebf75569ff789c">00088</a> <a class="code" href="classZeroCrossing.html#af9c41b92aa8ff8bddaebf75569ff789c" title="Get the copyright statement or licensing summary for the plugin.">ZeroCrossing::getCopyright</a>()<span class="keyword"> const</span>
167 <a name="l00089"></a>00089 <span class="keyword"></span>{
168 <a name="l00090"></a>00090 <span class="keywordflow">return</span> <span class="stringliteral">&quot;Freely redistributable (BSD license)&quot;</span>;
169 <a name="l00091"></a>00091 }
170 <a name="l00092"></a>00092
171 <a name="l00093"></a>00093 <span class="keywordtype">bool</span>
172 <a name="l00094"></a><a class="code" href="classZeroCrossing.html#af21bbcc87a6eb7875dfab7d86222dccc">00094</a> <a class="code" href="classZeroCrossing.html#af21bbcc87a6eb7875dfab7d86222dccc" title="Initialise a plugin to prepare it for use with the given number of input channels, step size (window increment, in sample frames) and block size (window size, in sample frames).">ZeroCrossing::initialise</a>(<span class="keywordtype">size_t</span> channels, <span class="keywordtype">size_t</span> stepSize, <span class="keywordtype">size_t</span> blockSize)
173 <a name="l00095"></a>00095 {
174 <a name="l00096"></a>00096 <span class="keywordflow">if</span> (channels &lt; <a class="code" href="classVamp_1_1Plugin.html#a267b42e866df3cf0d190893e8096f525" title="Get the minimum supported number of input channels.">getMinChannelCount</a>() ||
175 <a name="l00097"></a>00097 channels &gt; <a class="code" href="classVamp_1_1Plugin.html#a2c5ab12b6fa4847cb244bd1e9cb3ae5e" title="Get the maximum supported number of input channels.">getMaxChannelCount</a>()) <span class="keywordflow">return</span> <span class="keyword">false</span>;
176 <a name="l00098"></a>00098
177 <a name="l00099"></a>00099 <a class="code" href="classZeroCrossing.html#a584f100b87c78f9af9da040d79567d52">m_stepSize</a> = std::min(stepSize, blockSize);
178 <a name="l00100"></a>00100
179 <a name="l00101"></a>00101 <span class="keywordflow">return</span> <span class="keyword">true</span>;
180 <a name="l00102"></a>00102 }
181 <a name="l00103"></a>00103
182 <a name="l00104"></a>00104 <span class="keywordtype">void</span>
183 <a name="l00105"></a><a class="code" href="classZeroCrossing.html#a9ae6c4a31ea027dceb1e97ead807e228">00105</a> <a class="code" href="classZeroCrossing.html#a9ae6c4a31ea027dceb1e97ead807e228" title="Reset the plugin after use, to prepare it for another clean run.">ZeroCrossing::reset</a>()
184 <a name="l00106"></a>00106 {
185 <a name="l00107"></a>00107 <a class="code" href="classZeroCrossing.html#a0f2d9f2cab0a8a30344e1f2c0ebb8ee8">m_previousSample</a> = 0.0f;
186 <a name="l00108"></a>00108 }
187 <a name="l00109"></a>00109
188 <a name="l00110"></a>00110 <a class="code" href="classVamp_1_1Plugin.html#a30f531b8fb69fac41a24e3d2a6a08ed9">ZeroCrossing::OutputList</a>
189 <a name="l00111"></a><a class="code" href="classZeroCrossing.html#ac9d590a6feb1fc9a37d7892aefe2b688">00111</a> <a class="code" href="classZeroCrossing.html#ac9d590a6feb1fc9a37d7892aefe2b688" title="Get the outputs of this plugin.">ZeroCrossing::getOutputDescriptors</a>()<span class="keyword"> const</span>
190 <a name="l00112"></a>00112 <span class="keyword"></span>{
191 <a name="l00113"></a>00113 <a class="code" href="classVamp_1_1Plugin.html#a30f531b8fb69fac41a24e3d2a6a08ed9">OutputList</a> list;
192 <a name="l00114"></a>00114
193 <a name="l00115"></a>00115 <a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html">OutputDescriptor</a> zc;
194 <a name="l00116"></a>00116 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#ae2c893ddb1860589517ab7eaa989a18b" title="The name of the output, in computer-usable form.">identifier</a> = <span class="stringliteral">&quot;counts&quot;</span>;
195 <a name="l00117"></a>00117 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#ab824b2b34ee50f897a30901c620e8d87" title="The human-readable name of the output.">name</a> = <span class="stringliteral">&quot;Zero Crossing Counts&quot;</span>;
196 <a name="l00118"></a>00118 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#af9b4fe8f78e7126ead820ba5dc55efd1" title="A human-readable short text describing the output.">description</a> = <span class="stringliteral">&quot;The number of zero crossing points per processing block&quot;</span>;
197 <a name="l00119"></a>00119 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#aa057a8833fa037f06ac9f7b85b85d5e4" title="The unit of the output, in human-readable form.">unit</a> = <span class="stringliteral">&quot;crossings&quot;</span>;
198 <a name="l00120"></a>00120 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#af0e577e1a256ff6eed6ea42133fec77d" title="True if the output has the same number of values per sample for every output sample.">hasFixedBinCount</a> = <span class="keyword">true</span>;
199 <a name="l00121"></a>00121 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#afdd006959a995e40ef7d565a3a4df6dc" title="The number of values per result of the output.">binCount</a> = 1;
200 <a name="l00122"></a>00122 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#ae9ccb65f99f477096b65dd031f4c5e31" title="True if the results in each output bin fall within a fixed numeric range (minimum and maximum values)...">hasKnownExtents</a> = <span class="keyword">false</span>;
201 <a name="l00123"></a>00123 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#a1b4858928d23bfd7d5bc557c82a83fb4" title="True if the output values are quantized to a particular resolution.">isQuantized</a> = <span class="keyword">true</span>;
202 <a name="l00124"></a>00124 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#a3bed37153067b625b95acb40b60dbf0b" title="Quantization resolution of the output values (e.g.">quantizeStep</a> = 1.0;
203 <a name="l00125"></a>00125 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#a0d1194980d44e31b25ef3b4b070d6b5d" title="Positioning in time of the output results.">sampleType</a> = <a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#abffa9ed50cd756df70fd51f0355f448ca0459d5d0d2198d21e8bc90abe4fdccca" title="Results from each process() align with that call&#39;s block start.">OutputDescriptor::OneSamplePerStep</a>;
204 <a name="l00126"></a>00126 list.push_back(zc);
205 <a name="l00127"></a>00127
206 <a name="l00128"></a>00128 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#ae2c893ddb1860589517ab7eaa989a18b" title="The name of the output, in computer-usable form.">identifier</a> = <span class="stringliteral">&quot;zerocrossings&quot;</span>;
207 <a name="l00129"></a>00129 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#ab824b2b34ee50f897a30901c620e8d87" title="The human-readable name of the output.">name</a> = <span class="stringliteral">&quot;Zero Crossings&quot;</span>;
208 <a name="l00130"></a>00130 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#af9b4fe8f78e7126ead820ba5dc55efd1" title="A human-readable short text describing the output.">description</a> = <span class="stringliteral">&quot;The locations of zero crossing points&quot;</span>;
209 <a name="l00131"></a>00131 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#aa057a8833fa037f06ac9f7b85b85d5e4" title="The unit of the output, in human-readable form.">unit</a> = <span class="stringliteral">&quot;&quot;</span>;
210 <a name="l00132"></a>00132 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#af0e577e1a256ff6eed6ea42133fec77d" title="True if the output has the same number of values per sample for every output sample.">hasFixedBinCount</a> = <span class="keyword">true</span>;
211 <a name="l00133"></a>00133 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#afdd006959a995e40ef7d565a3a4df6dc" title="The number of values per result of the output.">binCount</a> = 0;
212 <a name="l00134"></a>00134 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#a0d1194980d44e31b25ef3b4b070d6b5d" title="Positioning in time of the output results.">sampleType</a> = <a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#abffa9ed50cd756df70fd51f0355f448cadea995a737867f7b22b52f1c43c5432e" title="Results are unevenly spaced and have individual timestamps.">OutputDescriptor::VariableSampleRate</a>;
213 <a name="l00135"></a>00135 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#add0cbbdfa9c91764037c39365b1d42af" title="Sample rate of the output results, as samples per second.">sampleRate</a> = <a class="code" href="classVamp_1_1Plugin.html#a59b9dd82a4f4eb946cd0474cc81abc23">m_inputSampleRate</a>;
214 <a name="l00136"></a>00136 list.push_back(zc);
215 <a name="l00137"></a>00137
216 <a name="l00138"></a>00138 <span class="keywordflow">return</span> list;
217 <a name="l00139"></a>00139 }
218 <a name="l00140"></a>00140
219 <a name="l00141"></a>00141 <a class="code" href="classVamp_1_1Plugin.html#a448fb57dc245d47923ec9eeaf9856c5f">ZeroCrossing::FeatureSet</a>
220 <a name="l00142"></a><a class="code" href="classZeroCrossing.html#abf4aaa6fd8cc03de63f4e1e8942633da">00142</a> <a class="code" href="classZeroCrossing.html#abf4aaa6fd8cc03de63f4e1e8942633da" title="Process a single block of input data.">ZeroCrossing::process</a>(<span class="keyword">const</span> <span class="keywordtype">float</span> *<span class="keyword">const</span> *inputBuffers,
221 <a name="l00143"></a>00143 <a class="code" href="structVamp_1_1RealTime.html" title="RealTime represents time values to nanosecond precision with accurate arithmetic and frame-rate conve...">Vamp::RealTime</a> timestamp)
222 <a name="l00144"></a>00144 {
223 <a name="l00145"></a>00145 <span class="keywordflow">if</span> (<a class="code" href="classZeroCrossing.html#a584f100b87c78f9af9da040d79567d52">m_stepSize</a> == 0) {
224 <a name="l00146"></a>00146 cerr &lt;&lt; <span class="stringliteral">&quot;ERROR: ZeroCrossing::process: &quot;</span>
225 <a name="l00147"></a>00147 &lt;&lt; <span class="stringliteral">&quot;ZeroCrossing has not been initialised&quot;</span>
226 <a name="l00148"></a>00148 &lt;&lt; endl;
227 <a name="l00149"></a>00149 <span class="keywordflow">return</span> <a class="code" href="classVamp_1_1Plugin.html#a448fb57dc245d47923ec9eeaf9856c5f">FeatureSet</a>();
228 <a name="l00150"></a>00150 }
229 <a name="l00151"></a>00151
230 <a name="l00152"></a>00152 <span class="keywordtype">float</span> prev = <a class="code" href="classZeroCrossing.html#a0f2d9f2cab0a8a30344e1f2c0ebb8ee8">m_previousSample</a>;
231 <a name="l00153"></a>00153 <span class="keywordtype">size_t</span> count = 0;
232 <a name="l00154"></a>00154
233 <a name="l00155"></a>00155 <a class="code" href="classVamp_1_1Plugin.html#a448fb57dc245d47923ec9eeaf9856c5f">FeatureSet</a> returnFeatures;
234 <a name="l00156"></a>00156
235 <a name="l00157"></a>00157 <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i &lt; <a class="code" href="classZeroCrossing.html#a584f100b87c78f9af9da040d79567d52">m_stepSize</a>; ++i) {
236 <a name="l00158"></a>00158
237 <a name="l00159"></a>00159 <span class="keywordtype">float</span> sample = inputBuffers[0][i];
238 <a name="l00160"></a>00160 <span class="keywordtype">bool</span> crossing = <span class="keyword">false</span>;
239 <a name="l00161"></a>00161
240 <a name="l00162"></a>00162 <span class="keywordflow">if</span> (sample &lt;= 0.0) {
241 <a name="l00163"></a>00163 <span class="keywordflow">if</span> (prev &gt; 0.0) crossing = <span class="keyword">true</span>;
242 <a name="l00164"></a>00164 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (sample &gt; 0.0) {
243 <a name="l00165"></a>00165 <span class="keywordflow">if</span> (prev &lt;= 0.0) crossing = <span class="keyword">true</span>;
244 <a name="l00166"></a>00166 }
245 <a name="l00167"></a>00167
246 <a name="l00168"></a>00168 <span class="keywordflow">if</span> (crossing) {
247 <a name="l00169"></a>00169 ++count;
248 <a name="l00170"></a>00170 <a class="code" href="structVamp_1_1Plugin_1_1Feature.html">Feature</a> feature;
249 <a name="l00171"></a>00171 feature.<a class="code" href="structVamp_1_1Plugin_1_1Feature.html#a98907091d0b6a589720ae35ae588a82b" title="True if an output feature has its own timestamp.">hasTimestamp</a> = <span class="keyword">true</span>;
250 <a name="l00172"></a>00172 feature.<a class="code" href="structVamp_1_1Plugin_1_1Feature.html#acaa605f36839c07e76f4882f5e22d8d7" title="Timestamp of the output feature.">timestamp</a> = timestamp +
251 <a name="l00173"></a>00173 <a class="code" href="structVamp_1_1RealTime.html#a939b4b1d1ca190db69a418883f16ce8a" title="Convert a sample frame at the given sample rate into a RealTime.">Vamp::RealTime::frame2RealTime</a>(i, (<span class="keywordtype">size_t</span>)<a class="code" href="classVamp_1_1Plugin.html#a59b9dd82a4f4eb946cd0474cc81abc23">m_inputSampleRate</a>);
252 <a name="l00174"></a>00174 returnFeatures[1].push_back(feature);
253 <a name="l00175"></a>00175 }
254 <a name="l00176"></a>00176
255 <a name="l00177"></a>00177 prev = sample;
256 <a name="l00178"></a>00178 }
257 <a name="l00179"></a>00179
258 <a name="l00180"></a>00180 <a class="code" href="classZeroCrossing.html#a0f2d9f2cab0a8a30344e1f2c0ebb8ee8">m_previousSample</a> = prev;
259 <a name="l00181"></a>00181
260 <a name="l00182"></a>00182 <a class="code" href="structVamp_1_1Plugin_1_1Feature.html">Feature</a> feature;
261 <a name="l00183"></a>00183 feature.<a class="code" href="structVamp_1_1Plugin_1_1Feature.html#a98907091d0b6a589720ae35ae588a82b" title="True if an output feature has its own timestamp.">hasTimestamp</a> = <span class="keyword">false</span>;
262 <a name="l00184"></a>00184 feature.<a class="code" href="structVamp_1_1Plugin_1_1Feature.html#a60b9f3057386820dbcaec0eb1189ce71" title="Results for a single sample of this feature.">values</a>.push_back(<span class="keywordtype">float</span>(count));
263 <a name="l00185"></a>00185
264 <a name="l00186"></a>00186 returnFeatures[0].push_back(feature);
265 <a name="l00187"></a>00187 <span class="keywordflow">return</span> returnFeatures;
266 <a name="l00188"></a>00188 }
267 <a name="l00189"></a>00189
268 <a name="l00190"></a>00190 <a class="code" href="classVamp_1_1Plugin.html#a448fb57dc245d47923ec9eeaf9856c5f">ZeroCrossing::FeatureSet</a>
269 <a name="l00191"></a><a class="code" href="classZeroCrossing.html#a70996d1b7166e303903daf92a9a37ad8">00191</a> <a class="code" href="classZeroCrossing.html#a70996d1b7166e303903daf92a9a37ad8" title="After all blocks have been processed, calculate and return any remaining features derived from the co...">ZeroCrossing::getRemainingFeatures</a>()
270 <a name="l00192"></a>00192 {
271 <a name="l00193"></a>00193 <span class="keywordflow">return</span> <a class="code" href="classVamp_1_1Plugin.html#a448fb57dc245d47923ec9eeaf9856c5f">FeatureSet</a>();
272 <a name="l00194"></a>00194 }
273 <a name="l00195"></a>00195
274 </pre></div></div><!-- contents -->
275 </div> 117 </div>
276 <div id="nav-path" class="navpath">
277 <ul>
278 <li class="navelem"><a class="el" href="ZeroCrossing_8cpp.html">ZeroCrossing.cpp</a> </li>
279
280 <li class="footer">Generated on Fri Jul 13 2012 13:28:48 for VampPluginSDK by
281 <a href="http://www.doxygen.org/index.html">
282 <img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.8.0 </li>
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