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Update for 2.4
author Chris Cannam
date Fri, 13 Jul 2012 13:30:27 +0100
parents 3c430ef1ed66
children 27319718b1f8
rev   line source
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Chris@3 32 &#160;<span id="projectnumber">2.4</span>
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Chris@1 76 <div class="title">ZeroCrossing.cpp</div> </div>
Chris@3 77 </div><!--header-->
Chris@1 78 <div class="contents">
Chris@1 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>
Chris@1 80 <a name="l00002"></a>00002
Chris@1 81 <a name="l00003"></a>00003 <span class="comment">/*</span>
Chris@1 82 <a name="l00004"></a>00004 <span class="comment"> Vamp</span>
Chris@1 83 <a name="l00005"></a>00005 <span class="comment"></span>
Chris@1 84 <a name="l00006"></a>00006 <span class="comment"> An API for audio analysis and feature extraction plugins.</span>
Chris@1 85 <a name="l00007"></a>00007 <span class="comment"></span>
Chris@1 86 <a name="l00008"></a>00008 <span class="comment"> Centre for Digital Music, Queen Mary, University of London.</span>
Chris@1 87 <a name="l00009"></a>00009 <span class="comment"> Copyright 2006 Chris Cannam.</span>
Chris@1 88 <a name="l00010"></a>00010 <span class="comment"> </span>
Chris@1 89 <a name="l00011"></a>00011 <span class="comment"> Permission is hereby granted, free of charge, to any person</span>
Chris@1 90 <a name="l00012"></a>00012 <span class="comment"> obtaining a copy of this software and associated documentation</span>
Chris@1 91 <a name="l00013"></a>00013 <span class="comment"> files (the &quot;Software&quot;), to deal in the Software without</span>
Chris@1 92 <a name="l00014"></a>00014 <span class="comment"> restriction, including without limitation the rights to use, copy,</span>
Chris@1 93 <a name="l00015"></a>00015 <span class="comment"> modify, merge, publish, distribute, sublicense, and/or sell copies</span>
Chris@1 94 <a name="l00016"></a>00016 <span class="comment"> of the Software, and to permit persons to whom the Software is</span>
Chris@1 95 <a name="l00017"></a>00017 <span class="comment"> furnished to do so, subject to the following conditions:</span>
Chris@1 96 <a name="l00018"></a>00018 <span class="comment"></span>
Chris@1 97 <a name="l00019"></a>00019 <span class="comment"> The above copyright notice and this permission notice shall be</span>
Chris@1 98 <a name="l00020"></a>00020 <span class="comment"> included in all copies or substantial portions of the Software.</span>
Chris@1 99 <a name="l00021"></a>00021 <span class="comment"></span>
Chris@1 100 <a name="l00022"></a>00022 <span class="comment"> THE SOFTWARE IS PROVIDED &quot;AS IS&quot;, WITHOUT WARRANTY OF ANY KIND,</span>
Chris@1 101 <a name="l00023"></a>00023 <span class="comment"> EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF</span>
Chris@1 102 <a name="l00024"></a>00024 <span class="comment"> MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND</span>
Chris@1 103 <a name="l00025"></a>00025 <span class="comment"> NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR</span>
Chris@1 104 <a name="l00026"></a>00026 <span class="comment"> ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF</span>
Chris@1 105 <a name="l00027"></a>00027 <span class="comment"> CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION</span>
Chris@1 106 <a name="l00028"></a>00028 <span class="comment"> WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.</span>
Chris@1 107 <a name="l00029"></a>00029 <span class="comment"></span>
Chris@1 108 <a name="l00030"></a>00030 <span class="comment"> Except as contained in this notice, the names of the Centre for</span>
Chris@1 109 <a name="l00031"></a>00031 <span class="comment"> Digital Music; Queen Mary, University of London; and Chris Cannam</span>
Chris@1 110 <a name="l00032"></a>00032 <span class="comment"> shall not be used in advertising or otherwise to promote the sale,</span>
Chris@1 111 <a name="l00033"></a>00033 <span class="comment"> use or other dealings in this Software without prior written</span>
Chris@1 112 <a name="l00034"></a>00034 <span class="comment"> authorization.</span>
Chris@1 113 <a name="l00035"></a>00035 <span class="comment">*/</span>
Chris@1 114 <a name="l00036"></a>00036
Chris@1 115 <a name="l00037"></a>00037 <span class="preprocessor">#include &quot;<a class="code" href="ZeroCrossing_8h.html">ZeroCrossing.h</a>&quot;</span>
Chris@1 116 <a name="l00038"></a>00038
Chris@1 117 <a name="l00039"></a>00039 <span class="keyword">using</span> std::string;
Chris@1 118 <a name="l00040"></a>00040 <span class="keyword">using</span> std::vector;
Chris@1 119 <a name="l00041"></a>00041 <span class="keyword">using</span> std::cerr;
Chris@1 120 <a name="l00042"></a>00042 <span class="keyword">using</span> std::endl;
Chris@1 121 <a name="l00043"></a>00043
Chris@1 122 <a name="l00044"></a>00044 <span class="preprocessor">#include &lt;cmath&gt;</span>
Chris@1 123 <a name="l00045"></a>00045
Chris@1 124 <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) :
Chris@1 125 <a name="l00047"></a>00047 Plugin(inputSampleRate),
Chris@1 126 <a name="l00048"></a>00048 m_stepSize(0),
Chris@1 127 <a name="l00049"></a>00049 m_previousSample(0.0f)
Chris@1 128 <a name="l00050"></a>00050 {
Chris@1 129 <a name="l00051"></a>00051 }
Chris@1 130 <a name="l00052"></a>00052
Chris@1 131 <a name="l00053"></a><a class="code" href="classZeroCrossing.html#af1de0da862e6e2443581e4e16044675b">00053</a> <a class="code" href="classZeroCrossing.html#af1de0da862e6e2443581e4e16044675b">ZeroCrossing::~ZeroCrossing</a>()
Chris@1 132 <a name="l00054"></a>00054 {
Chris@1 133 <a name="l00055"></a>00055 }
Chris@1 134 <a name="l00056"></a>00056
Chris@1 135 <a name="l00057"></a>00057 <span class="keywordtype">string</span>
Chris@1 136 <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>
Chris@1 137 <a name="l00059"></a>00059 <span class="keyword"></span>{
Chris@1 138 <a name="l00060"></a>00060 <span class="keywordflow">return</span> <span class="stringliteral">&quot;zerocrossing&quot;</span>;
Chris@1 139 <a name="l00061"></a>00061 }
Chris@1 140 <a name="l00062"></a>00062
Chris@1 141 <a name="l00063"></a>00063 <span class="keywordtype">string</span>
Chris@1 142 <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>
Chris@1 143 <a name="l00065"></a>00065 <span class="keyword"></span>{
Chris@1 144 <a name="l00066"></a>00066 <span class="keywordflow">return</span> <span class="stringliteral">&quot;Zero Crossings&quot;</span>;
Chris@1 145 <a name="l00067"></a>00067 }
Chris@1 146 <a name="l00068"></a>00068
Chris@1 147 <a name="l00069"></a>00069 <span class="keywordtype">string</span>
Chris@1 148 <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>
Chris@1 149 <a name="l00071"></a>00071 <span class="keyword"></span>{
Chris@1 150 <a name="l00072"></a>00072 <span class="keywordflow">return</span> <span class="stringliteral">&quot;Detect and count zero crossing points&quot;</span>;
Chris@1 151 <a name="l00073"></a>00073 }
Chris@1 152 <a name="l00074"></a>00074
Chris@1 153 <a name="l00075"></a>00075 <span class="keywordtype">string</span>
Chris@1 154 <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>
Chris@1 155 <a name="l00077"></a>00077 <span class="keyword"></span>{
Chris@1 156 <a name="l00078"></a>00078 <span class="keywordflow">return</span> <span class="stringliteral">&quot;Vamp SDK Example Plugins&quot;</span>;
Chris@1 157 <a name="l00079"></a>00079 }
Chris@1 158 <a name="l00080"></a>00080
Chris@1 159 <a name="l00081"></a>00081 <span class="keywordtype">int</span>
Chris@1 160 <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>
Chris@1 161 <a name="l00083"></a>00083 <span class="keyword"></span>{
Chris@1 162 <a name="l00084"></a>00084 <span class="keywordflow">return</span> 2;
Chris@1 163 <a name="l00085"></a>00085 }
Chris@1 164 <a name="l00086"></a>00086
Chris@1 165 <a name="l00087"></a>00087 <span class="keywordtype">string</span>
Chris@1 166 <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>
Chris@1 167 <a name="l00089"></a>00089 <span class="keyword"></span>{
Chris@1 168 <a name="l00090"></a>00090 <span class="keywordflow">return</span> <span class="stringliteral">&quot;Freely redistributable (BSD license)&quot;</span>;
Chris@1 169 <a name="l00091"></a>00091 }
Chris@1 170 <a name="l00092"></a>00092
Chris@1 171 <a name="l00093"></a>00093 <span class="keywordtype">bool</span>
Chris@1 172 <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)
Chris@1 173 <a name="l00095"></a>00095 {
Chris@1 174 <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>() ||
Chris@1 175 <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>;
Chris@1 176 <a name="l00098"></a>00098
Chris@1 177 <a name="l00099"></a>00099 <a class="code" href="classZeroCrossing.html#a584f100b87c78f9af9da040d79567d52">m_stepSize</a> = std::min(stepSize, blockSize);
Chris@1 178 <a name="l00100"></a>00100
Chris@1 179 <a name="l00101"></a>00101 <span class="keywordflow">return</span> <span class="keyword">true</span>;
Chris@1 180 <a name="l00102"></a>00102 }
Chris@1 181 <a name="l00103"></a>00103
Chris@1 182 <a name="l00104"></a>00104 <span class="keywordtype">void</span>
Chris@1 183 <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>()
Chris@1 184 <a name="l00106"></a>00106 {
Chris@1 185 <a name="l00107"></a>00107 <a class="code" href="classZeroCrossing.html#a0f2d9f2cab0a8a30344e1f2c0ebb8ee8">m_previousSample</a> = 0.0f;
Chris@1 186 <a name="l00108"></a>00108 }
Chris@1 187 <a name="l00109"></a>00109
Chris@1 188 <a name="l00110"></a>00110 <a class="code" href="classVamp_1_1Plugin.html#a30f531b8fb69fac41a24e3d2a6a08ed9">ZeroCrossing::OutputList</a>
Chris@1 189 <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>
Chris@1 190 <a name="l00112"></a>00112 <span class="keyword"></span>{
Chris@1 191 <a name="l00113"></a>00113 <a class="code" href="classVamp_1_1Plugin.html#a30f531b8fb69fac41a24e3d2a6a08ed9">OutputList</a> list;
Chris@1 192 <a name="l00114"></a>00114
Chris@1 193 <a name="l00115"></a>00115 <a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html">OutputDescriptor</a> zc;
Chris@1 194 <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>;
Chris@1 195 <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>;
Chris@1 196 <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>;
Chris@1 197 <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>;
Chris@1 198 <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>;
Chris@1 199 <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;
Chris@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>;
Chris@1 201 <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>;
Chris@1 202 <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;
Chris@1 203 <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>;
Chris@1 204 <a name="l00126"></a>00126 list.push_back(zc);
Chris@1 205 <a name="l00127"></a>00127
Chris@1 206 <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>;
Chris@1 207 <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>;
Chris@1 208 <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>;
Chris@1 209 <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>;
Chris@1 210 <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>;
Chris@1 211 <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;
Chris@1 212 <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>;
Chris@1 213 <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>;
Chris@1 214 <a name="l00136"></a>00136 list.push_back(zc);
Chris@1 215 <a name="l00137"></a>00137
Chris@1 216 <a name="l00138"></a>00138 <span class="keywordflow">return</span> list;
Chris@1 217 <a name="l00139"></a>00139 }
Chris@1 218 <a name="l00140"></a>00140
Chris@1 219 <a name="l00141"></a>00141 <a class="code" href="classVamp_1_1Plugin.html#a448fb57dc245d47923ec9eeaf9856c5f">ZeroCrossing::FeatureSet</a>
Chris@1 220 <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,
Chris@1 221 <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)
Chris@1 222 <a name="l00144"></a>00144 {
Chris@1 223 <a name="l00145"></a>00145 <span class="keywordflow">if</span> (<a class="code" href="classZeroCrossing.html#a584f100b87c78f9af9da040d79567d52">m_stepSize</a> == 0) {
Chris@1 224 <a name="l00146"></a>00146 cerr &lt;&lt; <span class="stringliteral">&quot;ERROR: ZeroCrossing::process: &quot;</span>
Chris@1 225 <a name="l00147"></a>00147 &lt;&lt; <span class="stringliteral">&quot;ZeroCrossing has not been initialised&quot;</span>
Chris@1 226 <a name="l00148"></a>00148 &lt;&lt; endl;
Chris@1 227 <a name="l00149"></a>00149 <span class="keywordflow">return</span> <a class="code" href="classVamp_1_1Plugin.html#a448fb57dc245d47923ec9eeaf9856c5f">FeatureSet</a>();
Chris@1 228 <a name="l00150"></a>00150 }
Chris@1 229 <a name="l00151"></a>00151
Chris@1 230 <a name="l00152"></a>00152 <span class="keywordtype">float</span> prev = <a class="code" href="classZeroCrossing.html#a0f2d9f2cab0a8a30344e1f2c0ebb8ee8">m_previousSample</a>;
Chris@1 231 <a name="l00153"></a>00153 <span class="keywordtype">size_t</span> count = 0;
Chris@1 232 <a name="l00154"></a>00154
Chris@1 233 <a name="l00155"></a>00155 <a class="code" href="classVamp_1_1Plugin.html#a448fb57dc245d47923ec9eeaf9856c5f">FeatureSet</a> returnFeatures;
Chris@1 234 <a name="l00156"></a>00156
Chris@1 235 <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) {
Chris@1 236 <a name="l00158"></a>00158
Chris@1 237 <a name="l00159"></a>00159 <span class="keywordtype">float</span> sample = inputBuffers[0][i];
Chris@1 238 <a name="l00160"></a>00160 <span class="keywordtype">bool</span> crossing = <span class="keyword">false</span>;
Chris@1 239 <a name="l00161"></a>00161
Chris@1 240 <a name="l00162"></a>00162 <span class="keywordflow">if</span> (sample &lt;= 0.0) {
Chris@1 241 <a name="l00163"></a>00163 <span class="keywordflow">if</span> (prev &gt; 0.0) crossing = <span class="keyword">true</span>;
Chris@1 242 <a name="l00164"></a>00164 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (sample &gt; 0.0) {
Chris@1 243 <a name="l00165"></a>00165 <span class="keywordflow">if</span> (prev &lt;= 0.0) crossing = <span class="keyword">true</span>;
Chris@1 244 <a name="l00166"></a>00166 }
Chris@1 245 <a name="l00167"></a>00167
Chris@1 246 <a name="l00168"></a>00168 <span class="keywordflow">if</span> (crossing) {
Chris@1 247 <a name="l00169"></a>00169 ++count;
Chris@1 248 <a name="l00170"></a>00170 <a class="code" href="structVamp_1_1Plugin_1_1Feature.html">Feature</a> feature;
Chris@1 249 <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>;
Chris@1 250 <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 +
Chris@1 251 <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>);
Chris@1 252 <a name="l00174"></a>00174 returnFeatures[1].push_back(feature);
Chris@1 253 <a name="l00175"></a>00175 }
Chris@1 254 <a name="l00176"></a>00176
Chris@1 255 <a name="l00177"></a>00177 prev = sample;
Chris@1 256 <a name="l00178"></a>00178 }
Chris@1 257 <a name="l00179"></a>00179
Chris@1 258 <a name="l00180"></a>00180 <a class="code" href="classZeroCrossing.html#a0f2d9f2cab0a8a30344e1f2c0ebb8ee8">m_previousSample</a> = prev;
Chris@1 259 <a name="l00181"></a>00181
Chris@1 260 <a name="l00182"></a>00182 <a class="code" href="structVamp_1_1Plugin_1_1Feature.html">Feature</a> feature;
Chris@1 261 <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>;
Chris@1 262 <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));
Chris@1 263 <a name="l00185"></a>00185
Chris@1 264 <a name="l00186"></a>00186 returnFeatures[0].push_back(feature);
Chris@1 265 <a name="l00187"></a>00187 <span class="keywordflow">return</span> returnFeatures;
Chris@1 266 <a name="l00188"></a>00188 }
Chris@1 267 <a name="l00189"></a>00189
Chris@1 268 <a name="l00190"></a>00190 <a class="code" href="classVamp_1_1Plugin.html#a448fb57dc245d47923ec9eeaf9856c5f">ZeroCrossing::FeatureSet</a>
Chris@1 269 <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>()
Chris@1 270 <a name="l00192"></a>00192 {
Chris@1 271 <a name="l00193"></a>00193 <span class="keywordflow">return</span> <a class="code" href="classVamp_1_1Plugin.html#a448fb57dc245d47923ec9eeaf9856c5f">FeatureSet</a>();
Chris@1 272 <a name="l00194"></a>00194 }
Chris@1 273 <a name="l00195"></a>00195
Chris@3 274 </pre></div></div><!-- contents -->
Chris@1 275 </div>
Chris@1 276 <div id="nav-path" class="navpath">
Chris@1 277 <ul>
Chris@1 278 <li class="navelem"><a class="el" href="ZeroCrossing_8cpp.html">ZeroCrossing.cpp</a> </li>
Chris@1 279
Chris@3 280 <li class="footer">Generated on Fri Jul 13 2012 13:28:48 for VampPluginSDK by
Chris@1 281 <a href="http://www.doxygen.org/index.html">
Chris@3 282 <img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.8.0 </li>
Chris@1 283 </ul>
Chris@1 284 </div>
Chris@1 285
Chris@1 286
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Chris@1 288 </html>