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Add a page about the Vamp Plugin Pack, including links to download mirrors
author Chris Cannam
date Tue, 11 Aug 2020 16:41:11 +0100
parents 8260c0f4e05b
children
rev   line source
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cannam@50 30 <div id="projectname">VampPluginSDK
cannam@50 31 &#160;<span id="projectnumber">2.1</span>
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cannam@50 75 <div class="title">SpectralCentroid.cpp</div> </div>
cannam@50 76 </div>
cannam@50 77 <div class="contents">
cannam@50 78 <a href="SpectralCentroid_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>
cannam@50 79 <a name="l00002"></a>00002
cannam@50 80 <a name="l00003"></a>00003 <span class="comment">/*</span>
cannam@50 81 <a name="l00004"></a>00004 <span class="comment"> Vamp</span>
cannam@50 82 <a name="l00005"></a>00005 <span class="comment"></span>
cannam@50 83 <a name="l00006"></a>00006 <span class="comment"> An API for audio analysis and feature extraction plugins.</span>
cannam@50 84 <a name="l00007"></a>00007 <span class="comment"></span>
cannam@50 85 <a name="l00008"></a>00008 <span class="comment"> Centre for Digital Music, Queen Mary, University of London.</span>
cannam@50 86 <a name="l00009"></a>00009 <span class="comment"> Copyright 2006 Chris Cannam.</span>
cannam@50 87 <a name="l00010"></a>00010 <span class="comment"> </span>
cannam@50 88 <a name="l00011"></a>00011 <span class="comment"> Permission is hereby granted, free of charge, to any person</span>
cannam@50 89 <a name="l00012"></a>00012 <span class="comment"> obtaining a copy of this software and associated documentation</span>
cannam@50 90 <a name="l00013"></a>00013 <span class="comment"> files (the &quot;Software&quot;), to deal in the Software without</span>
cannam@50 91 <a name="l00014"></a>00014 <span class="comment"> restriction, including without limitation the rights to use, copy,</span>
cannam@50 92 <a name="l00015"></a>00015 <span class="comment"> modify, merge, publish, distribute, sublicense, and/or sell copies</span>
cannam@50 93 <a name="l00016"></a>00016 <span class="comment"> of the Software, and to permit persons to whom the Software is</span>
cannam@50 94 <a name="l00017"></a>00017 <span class="comment"> furnished to do so, subject to the following conditions:</span>
cannam@50 95 <a name="l00018"></a>00018 <span class="comment"></span>
cannam@50 96 <a name="l00019"></a>00019 <span class="comment"> The above copyright notice and this permission notice shall be</span>
cannam@50 97 <a name="l00020"></a>00020 <span class="comment"> included in all copies or substantial portions of the Software.</span>
cannam@50 98 <a name="l00021"></a>00021 <span class="comment"></span>
cannam@50 99 <a name="l00022"></a>00022 <span class="comment"> THE SOFTWARE IS PROVIDED &quot;AS IS&quot;, WITHOUT WARRANTY OF ANY KIND,</span>
cannam@50 100 <a name="l00023"></a>00023 <span class="comment"> EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF</span>
cannam@50 101 <a name="l00024"></a>00024 <span class="comment"> MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND</span>
cannam@50 102 <a name="l00025"></a>00025 <span class="comment"> NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR</span>
cannam@50 103 <a name="l00026"></a>00026 <span class="comment"> ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF</span>
cannam@50 104 <a name="l00027"></a>00027 <span class="comment"> CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION</span>
cannam@50 105 <a name="l00028"></a>00028 <span class="comment"> WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.</span>
cannam@50 106 <a name="l00029"></a>00029 <span class="comment"></span>
cannam@50 107 <a name="l00030"></a>00030 <span class="comment"> Except as contained in this notice, the names of the Centre for</span>
cannam@50 108 <a name="l00031"></a>00031 <span class="comment"> Digital Music; Queen Mary, University of London; and Chris Cannam</span>
cannam@50 109 <a name="l00032"></a>00032 <span class="comment"> shall not be used in advertising or otherwise to promote the sale,</span>
cannam@50 110 <a name="l00033"></a>00033 <span class="comment"> use or other dealings in this Software without prior written</span>
cannam@50 111 <a name="l00034"></a>00034 <span class="comment"> authorization.</span>
cannam@50 112 <a name="l00035"></a>00035 <span class="comment">*/</span>
cannam@50 113 <a name="l00036"></a>00036
cannam@50 114 <a name="l00037"></a>00037 <span class="preprocessor">#include &quot;<a class="code" href="SpectralCentroid_8h.html">SpectralCentroid.h</a>&quot;</span>
cannam@50 115 <a name="l00038"></a>00038
cannam@50 116 <a name="l00039"></a>00039 <span class="keyword">using</span> std::string;
cannam@50 117 <a name="l00040"></a>00040 <span class="keyword">using</span> std::vector;
cannam@50 118 <a name="l00041"></a>00041 <span class="keyword">using</span> std::cerr;
cannam@50 119 <a name="l00042"></a>00042 <span class="keyword">using</span> std::endl;
cannam@50 120 <a name="l00043"></a>00043
cannam@50 121 <a name="l00044"></a>00044 <span class="preprocessor">#include &lt;math.h&gt;</span>
cannam@50 122 <a name="l00045"></a>00045
cannam@50 123 <a name="l00046"></a>00046 <span class="preprocessor">#ifdef __SUNPRO_CC</span>
cannam@50 124 <a name="l00047"></a>00047 <span class="preprocessor"></span><span class="preprocessor">#include &lt;ieeefp.h&gt;</span>
cannam@50 125 <a name="l00048"></a>00048 <span class="preprocessor">#define isinf(x) (!finite(x))</span>
cannam@50 126 <a name="l00049"></a>00049 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
cannam@50 127 <a name="l00050"></a>00050 <span class="preprocessor"></span>
cannam@50 128 <a name="l00051"></a>00051 <span class="preprocessor">#ifdef WIN32</span>
cannam@50 129 <a name="l00052"></a>00052 <span class="preprocessor"></span><span class="preprocessor">#define isnan(x) false</span>
cannam@50 130 <a name="l00053"></a>00053 <span class="preprocessor"></span><span class="preprocessor">#define isinf(x) false</span>
cannam@50 131 <a name="l00054"></a>00054 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
cannam@50 132 <a name="l00055"></a>00055 <span class="preprocessor"></span>
cannam@50 133 <a name="l00056"></a><a class="code" href="classSpectralCentroid.html#a2cd801ad72f262eceb95ab0d22e7dbcd">00056</a> <a class="code" href="classSpectralCentroid.html#a2cd801ad72f262eceb95ab0d22e7dbcd">SpectralCentroid::SpectralCentroid</a>(<span class="keywordtype">float</span> inputSampleRate) :
cannam@50 134 <a name="l00057"></a>00057 Plugin(inputSampleRate),
cannam@50 135 <a name="l00058"></a>00058 m_stepSize(0),
cannam@50 136 <a name="l00059"></a>00059 m_blockSize(0)
cannam@50 137 <a name="l00060"></a>00060 {
cannam@50 138 <a name="l00061"></a>00061 }
cannam@50 139 <a name="l00062"></a>00062
cannam@50 140 <a name="l00063"></a><a class="code" href="classSpectralCentroid.html#a483e0d6757bc3dcf61e8066f764f45c6">00063</a> <a class="code" href="classSpectralCentroid.html#a483e0d6757bc3dcf61e8066f764f45c6">SpectralCentroid::~SpectralCentroid</a>()
cannam@50 141 <a name="l00064"></a>00064 {
cannam@50 142 <a name="l00065"></a>00065 }
cannam@50 143 <a name="l00066"></a>00066
cannam@50 144 <a name="l00067"></a>00067 <span class="keywordtype">string</span>
cannam@50 145 <a name="l00068"></a><a class="code" href="classSpectralCentroid.html#a1b2c4c8440c024c4c635fcef5697949f">00068</a> <a class="code" href="classSpectralCentroid.html#a1b2c4c8440c024c4c635fcef5697949f" title="Get the computer-usable name of the plugin.">SpectralCentroid::getIdentifier</a>()<span class="keyword"> const</span>
cannam@50 146 <a name="l00069"></a>00069 <span class="keyword"></span>{
cannam@50 147 <a name="l00070"></a>00070 <span class="keywordflow">return</span> <span class="stringliteral">&quot;spectralcentroid&quot;</span>;
cannam@50 148 <a name="l00071"></a>00071 }
cannam@50 149 <a name="l00072"></a>00072
cannam@50 150 <a name="l00073"></a>00073 <span class="keywordtype">string</span>
cannam@50 151 <a name="l00074"></a><a class="code" href="classSpectralCentroid.html#ab7e6a620fea568af431be3cfd9dd5a41">00074</a> <a class="code" href="classSpectralCentroid.html#ab7e6a620fea568af431be3cfd9dd5a41" title="Get a human-readable name or title of the plugin.">SpectralCentroid::getName</a>()<span class="keyword"> const</span>
cannam@50 152 <a name="l00075"></a>00075 <span class="keyword"></span>{
cannam@50 153 <a name="l00076"></a>00076 <span class="keywordflow">return</span> <span class="stringliteral">&quot;Spectral Centroid&quot;</span>;
cannam@50 154 <a name="l00077"></a>00077 }
cannam@50 155 <a name="l00078"></a>00078
cannam@50 156 <a name="l00079"></a>00079 <span class="keywordtype">string</span>
cannam@50 157 <a name="l00080"></a><a class="code" href="classSpectralCentroid.html#a8fbb74a46283057d9a0b0e4718ee943c">00080</a> <a class="code" href="classSpectralCentroid.html#a8fbb74a46283057d9a0b0e4718ee943c" title="Get a human-readable description for the plugin, typically a line of text that may optionally be disp...">SpectralCentroid::getDescription</a>()<span class="keyword"> const</span>
cannam@50 158 <a name="l00081"></a>00081 <span class="keyword"></span>{
cannam@50 159 <a name="l00082"></a>00082 <span class="keywordflow">return</span> <span class="stringliteral">&quot;Calculate the centroid frequency of the spectrum of the input signal&quot;</span>;
cannam@50 160 <a name="l00083"></a>00083 }
cannam@50 161 <a name="l00084"></a>00084
cannam@50 162 <a name="l00085"></a>00085 <span class="keywordtype">string</span>
cannam@50 163 <a name="l00086"></a><a class="code" href="classSpectralCentroid.html#ac01ff858bf67e2e93ad5d24a6ba8c8c8">00086</a> <a class="code" href="classSpectralCentroid.html#ac01ff858bf67e2e93ad5d24a6ba8c8c8" title="Get the name of the author or vendor of the plugin in human-readable form.">SpectralCentroid::getMaker</a>()<span class="keyword"> const</span>
cannam@50 164 <a name="l00087"></a>00087 <span class="keyword"></span>{
cannam@50 165 <a name="l00088"></a>00088 <span class="keywordflow">return</span> <span class="stringliteral">&quot;Vamp SDK Example Plugins&quot;</span>;
cannam@50 166 <a name="l00089"></a>00089 }
cannam@50 167 <a name="l00090"></a>00090
cannam@50 168 <a name="l00091"></a>00091 <span class="keywordtype">int</span>
cannam@50 169 <a name="l00092"></a><a class="code" href="classSpectralCentroid.html#af64622e66bf678ac2b0b58aa832ca2b3">00092</a> <a class="code" href="classSpectralCentroid.html#af64622e66bf678ac2b0b58aa832ca2b3" title="Get the version number of the plugin.">SpectralCentroid::getPluginVersion</a>()<span class="keyword"> const</span>
cannam@50 170 <a name="l00093"></a>00093 <span class="keyword"></span>{
cannam@50 171 <a name="l00094"></a>00094 <span class="keywordflow">return</span> 2;
cannam@50 172 <a name="l00095"></a>00095 }
cannam@50 173 <a name="l00096"></a>00096
cannam@50 174 <a name="l00097"></a>00097 <span class="keywordtype">string</span>
cannam@50 175 <a name="l00098"></a><a class="code" href="classSpectralCentroid.html#a925747d513d598e0fa21ed0ed6520980">00098</a> <a class="code" href="classSpectralCentroid.html#a925747d513d598e0fa21ed0ed6520980" title="Get the copyright statement or licensing summary for the plugin.">SpectralCentroid::getCopyright</a>()<span class="keyword"> const</span>
cannam@50 176 <a name="l00099"></a>00099 <span class="keyword"></span>{
cannam@50 177 <a name="l00100"></a>00100 <span class="keywordflow">return</span> <span class="stringliteral">&quot;Freely redistributable (BSD license)&quot;</span>;
cannam@50 178 <a name="l00101"></a>00101 }
cannam@50 179 <a name="l00102"></a>00102
cannam@50 180 <a name="l00103"></a>00103 <span class="keywordtype">bool</span>
cannam@50 181 <a name="l00104"></a><a class="code" href="classSpectralCentroid.html#aab1ae16f5c68e2b319668f447908cedb">00104</a> <a class="code" href="classSpectralCentroid.html#aab1ae16f5c68e2b319668f447908cedb" 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).">SpectralCentroid::initialise</a>(<span class="keywordtype">size_t</span> channels, <span class="keywordtype">size_t</span> stepSize, <span class="keywordtype">size_t</span> blockSize)
cannam@50 182 <a name="l00105"></a>00105 {
cannam@50 183 <a name="l00106"></a>00106 <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>() ||
cannam@50 184 <a name="l00107"></a>00107 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>;
cannam@50 185 <a name="l00108"></a>00108
cannam@50 186 <a name="l00109"></a>00109 <a class="code" href="classSpectralCentroid.html#a49805a090ba58477da4adbefea4392a7">m_stepSize</a> = stepSize;
cannam@50 187 <a name="l00110"></a>00110 <a class="code" href="classSpectralCentroid.html#a262f583d71b442bb2d80023e7c85aa4e">m_blockSize</a> = blockSize;
cannam@50 188 <a name="l00111"></a>00111
cannam@50 189 <a name="l00112"></a>00112 <span class="keywordflow">return</span> <span class="keyword">true</span>;
cannam@50 190 <a name="l00113"></a>00113 }
cannam@50 191 <a name="l00114"></a>00114
cannam@50 192 <a name="l00115"></a>00115 <span class="keywordtype">void</span>
cannam@50 193 <a name="l00116"></a><a class="code" href="classSpectralCentroid.html#a9b5f5581691ff8f46bb7674d8d74395c">00116</a> <a class="code" href="classSpectralCentroid.html#a9b5f5581691ff8f46bb7674d8d74395c" title="Reset the plugin after use, to prepare it for another clean run.">SpectralCentroid::reset</a>()
cannam@50 194 <a name="l00117"></a>00117 {
cannam@50 195 <a name="l00118"></a>00118 }
cannam@50 196 <a name="l00119"></a>00119
cannam@50 197 <a name="l00120"></a>00120 <a class="code" href="classVamp_1_1Plugin.html#a30f531b8fb69fac41a24e3d2a6a08ed9">SpectralCentroid::OutputList</a>
cannam@50 198 <a name="l00121"></a><a class="code" href="classSpectralCentroid.html#a894ca9740927102bb80b56b5e9e95877">00121</a> <a class="code" href="classSpectralCentroid.html#a894ca9740927102bb80b56b5e9e95877" title="Get the outputs of this plugin.">SpectralCentroid::getOutputDescriptors</a>()<span class="keyword"> const</span>
cannam@50 199 <a name="l00122"></a>00122 <span class="keyword"></span>{
cannam@50 200 <a name="l00123"></a>00123 <a class="code" href="classVamp_1_1Plugin.html#a30f531b8fb69fac41a24e3d2a6a08ed9">OutputList</a> list;
cannam@50 201 <a name="l00124"></a>00124
cannam@50 202 <a name="l00125"></a>00125 <a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html">OutputDescriptor</a> d;
cannam@50 203 <a name="l00126"></a>00126 d.<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;logcentroid&quot;</span>;
cannam@50 204 <a name="l00127"></a>00127 d.<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;Log Frequency Centroid&quot;</span>;
cannam@50 205 <a name="l00128"></a>00128 d.<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;Centroid of the log weighted frequency spectrum&quot;</span>;
cannam@50 206 <a name="l00129"></a>00129 d.<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;Hz&quot;</span>;
cannam@50 207 <a name="l00130"></a>00130 d.<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>;
cannam@50 208 <a name="l00131"></a>00131 d.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#afdd006959a995e40ef7d565a3a4df6dc" title="The number of values per result of the output.">binCount</a> = 1;
cannam@50 209 <a name="l00132"></a>00132 d.<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>;
cannam@50 210 <a name="l00133"></a>00133 d.<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">false</span>;
cannam@50 211 <a name="l00134"></a>00134 d.<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>;
cannam@50 212 <a name="l00135"></a>00135 list.push_back(d);
cannam@50 213 <a name="l00136"></a>00136
cannam@50 214 <a name="l00137"></a>00137 d.<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;linearcentroid&quot;</span>;
cannam@50 215 <a name="l00138"></a>00138 d.<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;Linear Frequency Centroid&quot;</span>;
cannam@50 216 <a name="l00139"></a>00139 d.<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;Centroid of the linear frequency spectrum&quot;</span>;
cannam@50 217 <a name="l00140"></a>00140 list.push_back(d);
cannam@50 218 <a name="l00141"></a>00141
cannam@50 219 <a name="l00142"></a>00142 <span class="keywordflow">return</span> list;
cannam@50 220 <a name="l00143"></a>00143 }
cannam@50 221 <a name="l00144"></a>00144
cannam@50 222 <a name="l00145"></a>00145 <a class="code" href="classVamp_1_1Plugin.html#a448fb57dc245d47923ec9eeaf9856c5f">SpectralCentroid::FeatureSet</a>
cannam@50 223 <a name="l00146"></a><a class="code" href="classSpectralCentroid.html#aca96c70e7e75c9e4a7db38485018914c">00146</a> <a class="code" href="classSpectralCentroid.html#aca96c70e7e75c9e4a7db38485018914c" title="Process a single block of input data.">SpectralCentroid::process</a>(<span class="keyword">const</span> <span class="keywordtype">float</span> *<span class="keyword">const</span> *inputBuffers, <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)
cannam@50 224 <a name="l00147"></a>00147 {
cannam@50 225 <a name="l00148"></a>00148 <span class="keywordflow">if</span> (<a class="code" href="classSpectralCentroid.html#a49805a090ba58477da4adbefea4392a7">m_stepSize</a> == 0) {
cannam@50 226 <a name="l00149"></a>00149 cerr &lt;&lt; <span class="stringliteral">&quot;ERROR: SpectralCentroid::process: &quot;</span>
cannam@50 227 <a name="l00150"></a>00150 &lt;&lt; <span class="stringliteral">&quot;SpectralCentroid has not been initialised&quot;</span>
cannam@50 228 <a name="l00151"></a>00151 &lt;&lt; endl;
cannam@50 229 <a name="l00152"></a>00152 <span class="keywordflow">return</span> <a class="code" href="classVamp_1_1Plugin.html#a448fb57dc245d47923ec9eeaf9856c5f">FeatureSet</a>();
cannam@50 230 <a name="l00153"></a>00153 }
cannam@50 231 <a name="l00154"></a>00154
cannam@50 232 <a name="l00155"></a>00155 <span class="keywordtype">double</span> numLin = 0.0, numLog = 0.0, denom = 0.0;
cannam@50 233 <a name="l00156"></a>00156
cannam@50 234 <a name="l00157"></a>00157 <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 1; i &lt;= <a class="code" href="classSpectralCentroid.html#a262f583d71b442bb2d80023e7c85aa4e">m_blockSize</a>/2; ++i) {
cannam@50 235 <a name="l00158"></a>00158 <span class="keywordtype">double</span> freq = (double(i) * <a class="code" href="classVamp_1_1Plugin.html#a59b9dd82a4f4eb946cd0474cc81abc23">m_inputSampleRate</a>) / <a class="code" href="classSpectralCentroid.html#a262f583d71b442bb2d80023e7c85aa4e">m_blockSize</a>;
cannam@50 236 <a name="l00159"></a>00159 <span class="keywordtype">double</span> real = inputBuffers[0][i*2];
cannam@50 237 <a name="l00160"></a>00160 <span class="keywordtype">double</span> imag = inputBuffers[0][i*2 + 1];
cannam@50 238 <a name="l00161"></a>00161 <span class="keywordtype">double</span> scalemag = sqrt(real * real + imag * imag) / (<a class="code" href="classSpectralCentroid.html#a262f583d71b442bb2d80023e7c85aa4e">m_blockSize</a>/2);
cannam@50 239 <a name="l00162"></a>00162 numLin += freq * scalemag;
cannam@50 240 <a name="l00163"></a>00163 numLog += log10f(freq) * scalemag;
cannam@50 241 <a name="l00164"></a>00164 denom += scalemag;
cannam@50 242 <a name="l00165"></a>00165 }
cannam@50 243 <a name="l00166"></a>00166
cannam@50 244 <a name="l00167"></a>00167 <a class="code" href="classVamp_1_1Plugin.html#a448fb57dc245d47923ec9eeaf9856c5f">FeatureSet</a> returnFeatures;
cannam@50 245 <a name="l00168"></a>00168
cannam@50 246 <a name="l00169"></a>00169 <span class="keywordflow">if</span> (denom != 0.0) {
cannam@50 247 <a name="l00170"></a>00170 <span class="keywordtype">float</span> centroidLin = float(numLin / denom);
cannam@50 248 <a name="l00171"></a>00171 <span class="keywordtype">float</span> centroidLog = powf(10, <span class="keywordtype">float</span>(numLog / denom));
cannam@50 249 <a name="l00172"></a>00172
cannam@50 250 <a name="l00173"></a>00173 <a class="code" href="structVamp_1_1Plugin_1_1Feature.html">Feature</a> feature;
cannam@50 251 <a name="l00174"></a>00174 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>;
cannam@50 252 <a name="l00175"></a>00175
cannam@50 253 <a name="l00176"></a>00176 <span class="keywordflow">if</span> (!isnan(centroidLog) &amp;&amp; !isinf(centroidLog)) {
cannam@50 254 <a name="l00177"></a>00177 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(centroidLog);
cannam@50 255 <a name="l00178"></a>00178 }
cannam@50 256 <a name="l00179"></a>00179 returnFeatures[0].push_back(feature);
cannam@50 257 <a name="l00180"></a>00180
cannam@50 258 <a name="l00181"></a>00181 feature.<a class="code" href="structVamp_1_1Plugin_1_1Feature.html#a60b9f3057386820dbcaec0eb1189ce71" title="Results for a single sample of this feature.">values</a>.clear();
cannam@50 259 <a name="l00182"></a>00182 <span class="keywordflow">if</span> (!isnan(centroidLin) &amp;&amp; !isinf(centroidLin)) {
cannam@50 260 <a name="l00183"></a>00183 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(centroidLin);
cannam@50 261 <a name="l00184"></a>00184 }
cannam@50 262 <a name="l00185"></a>00185 returnFeatures[1].push_back(feature);
cannam@50 263 <a name="l00186"></a>00186 }
cannam@50 264 <a name="l00187"></a>00187
cannam@50 265 <a name="l00188"></a>00188 <span class="keywordflow">return</span> returnFeatures;
cannam@50 266 <a name="l00189"></a>00189 }
cannam@50 267 <a name="l00190"></a>00190
cannam@50 268 <a name="l00191"></a>00191 <a class="code" href="classVamp_1_1Plugin.html#a448fb57dc245d47923ec9eeaf9856c5f">SpectralCentroid::FeatureSet</a>
cannam@50 269 <a name="l00192"></a><a class="code" href="classSpectralCentroid.html#a83ba39f0870a2f86837605a958dfab1a">00192</a> <a class="code" href="classSpectralCentroid.html#a83ba39f0870a2f86837605a958dfab1a" title="After all blocks have been processed, calculate and return any remaining features derived from the co...">SpectralCentroid::getRemainingFeatures</a>()
cannam@50 270 <a name="l00193"></a>00193 {
cannam@50 271 <a name="l00194"></a>00194 <span class="keywordflow">return</span> <a class="code" href="classVamp_1_1Plugin.html#a448fb57dc245d47923ec9eeaf9856c5f">FeatureSet</a>();
cannam@50 272 <a name="l00195"></a>00195 }
cannam@50 273 <a name="l00196"></a>00196
cannam@50 274 </pre></div></div>
cannam@50 275 </div>
cannam@50 276 <div id="nav-path" class="navpath">
cannam@50 277 <ul>
cannam@50 278 <li class="navelem"><a class="el" href="SpectralCentroid_8cpp.html">SpectralCentroid.cpp</a> </li>
cannam@50 279
cannam@50 280 <li class="footer">Generated on Tue Oct 4 2011 14:38:49 for VampPluginSDK by
cannam@50 281 <a href="http://www.doxygen.org/index.html">
cannam@50 282 <img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.7.5.1 </li>
cannam@50 283 </ul>
cannam@50 284 </div>
cannam@50 285
cannam@50 286
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cannam@50 288 </html>