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cannam@0 22 <h1>ZeroCrossing.cpp</h1><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>
cannam@0 23 <a name="l00002"></a>00002
cannam@0 24 <a name="l00003"></a>00003 <span class="comment">/*</span>
cannam@0 25 <a name="l00004"></a>00004 <span class="comment"> Vamp</span>
cannam@0 26 <a name="l00005"></a>00005 <span class="comment"></span>
cannam@0 27 <a name="l00006"></a>00006 <span class="comment"> An API for audio analysis and feature extraction plugins.</span>
cannam@0 28 <a name="l00007"></a>00007 <span class="comment"></span>
cannam@0 29 <a name="l00008"></a>00008 <span class="comment"> Centre for Digital Music, Queen Mary, University of London.</span>
cannam@0 30 <a name="l00009"></a>00009 <span class="comment"> Copyright 2006 Chris Cannam.</span>
cannam@0 31 <a name="l00010"></a>00010 <span class="comment"> </span>
cannam@0 32 <a name="l00011"></a>00011 <span class="comment"> Permission is hereby granted, free of charge, to any person</span>
cannam@0 33 <a name="l00012"></a>00012 <span class="comment"> obtaining a copy of this software and associated documentation</span>
cannam@0 34 <a name="l00013"></a>00013 <span class="comment"> files (the "Software"), to deal in the Software without</span>
cannam@0 35 <a name="l00014"></a>00014 <span class="comment"> restriction, including without limitation the rights to use, copy,</span>
cannam@0 36 <a name="l00015"></a>00015 <span class="comment"> modify, merge, publish, distribute, sublicense, and/or sell copies</span>
cannam@0 37 <a name="l00016"></a>00016 <span class="comment"> of the Software, and to permit persons to whom the Software is</span>
cannam@0 38 <a name="l00017"></a>00017 <span class="comment"> furnished to do so, subject to the following conditions:</span>
cannam@0 39 <a name="l00018"></a>00018 <span class="comment"></span>
cannam@0 40 <a name="l00019"></a>00019 <span class="comment"> The above copyright notice and this permission notice shall be</span>
cannam@0 41 <a name="l00020"></a>00020 <span class="comment"> included in all copies or substantial portions of the Software.</span>
cannam@0 42 <a name="l00021"></a>00021 <span class="comment"></span>
cannam@0 43 <a name="l00022"></a>00022 <span class="comment"> THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,</span>
cannam@0 44 <a name="l00023"></a>00023 <span class="comment"> EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF</span>
cannam@0 45 <a name="l00024"></a>00024 <span class="comment"> MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND</span>
cannam@0 46 <a name="l00025"></a>00025 <span class="comment"> NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR</span>
cannam@0 47 <a name="l00026"></a>00026 <span class="comment"> ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF</span>
cannam@0 48 <a name="l00027"></a>00027 <span class="comment"> CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION</span>
cannam@0 49 <a name="l00028"></a>00028 <span class="comment"> WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.</span>
cannam@0 50 <a name="l00029"></a>00029 <span class="comment"></span>
cannam@0 51 <a name="l00030"></a>00030 <span class="comment"> Except as contained in this notice, the names of the Centre for</span>
cannam@0 52 <a name="l00031"></a>00031 <span class="comment"> Digital Music; Queen Mary, University of London; and Chris Cannam</span>
cannam@0 53 <a name="l00032"></a>00032 <span class="comment"> shall not be used in advertising or otherwise to promote the sale,</span>
cannam@0 54 <a name="l00033"></a>00033 <span class="comment"> use or other dealings in this Software without prior written</span>
cannam@0 55 <a name="l00034"></a>00034 <span class="comment"> authorization.</span>
cannam@0 56 <a name="l00035"></a>00035 <span class="comment">*/</span>
cannam@0 57 <a name="l00036"></a>00036
cannam@0 58 <a name="l00037"></a>00037 <span class="preprocessor">#include "<a class="code" href="ZeroCrossing_8h.html">ZeroCrossing.h</a>"</span>
cannam@0 59 <a name="l00038"></a>00038
cannam@0 60 <a name="l00039"></a>00039 <span class="keyword">using</span> std::string;
cannam@0 61 <a name="l00040"></a>00040 <span class="keyword">using</span> std::vector;
cannam@0 62 <a name="l00041"></a>00041 <span class="keyword">using</span> std::cerr;
cannam@0 63 <a name="l00042"></a>00042 <span class="keyword">using</span> std::endl;
cannam@0 64 <a name="l00043"></a>00043
cannam@0 65 <a name="l00044"></a>00044
cannam@0 66 <a name="l00045"></a><a class="code" href="classZeroCrossing.html#9855153a54bdc9ba75cc1a705a149473">00045</a> <a class="code" href="classZeroCrossing.html#9855153a54bdc9ba75cc1a705a149473">ZeroCrossing::ZeroCrossing</a>(<span class="keywordtype">float</span> inputSampleRate) :
cannam@0 67 <a name="l00046"></a>00046 Plugin(inputSampleRate),
cannam@0 68 <a name="l00047"></a>00047 m_stepSize(0),
cannam@0 69 <a name="l00048"></a>00048 m_previousSample(0.0f)
cannam@0 70 <a name="l00049"></a>00049 {
cannam@0 71 <a name="l00050"></a>00050 }
cannam@0 72 <a name="l00051"></a>00051
cannam@0 73 <a name="l00052"></a><a class="code" href="classZeroCrossing.html#f1de0da862e6e2443581e4e16044675b">00052</a> <a class="code" href="classZeroCrossing.html#f1de0da862e6e2443581e4e16044675b">ZeroCrossing::~ZeroCrossing</a>()
cannam@0 74 <a name="l00053"></a>00053 {
cannam@0 75 <a name="l00054"></a>00054 }
cannam@0 76 <a name="l00055"></a>00055
cannam@0 77 <a name="l00056"></a>00056 <span class="keywordtype">string</span>
cannam@0 78 <a name="l00057"></a><a class="code" href="classZeroCrossing.html#f2baf9e19fcdd11cfe97ace56d4f5c1a">00057</a> <a class="code" href="classZeroCrossing.html#f2baf9e19fcdd11cfe97ace56d4f5c1a" title="Get the computer-usable name of the plugin.">ZeroCrossing::getIdentifier</a>()<span class="keyword"> const</span>
cannam@0 79 <a name="l00058"></a>00058 <span class="keyword"></span>{
cannam@0 80 <a name="l00059"></a>00059 <span class="keywordflow">return</span> <span class="stringliteral">"zerocrossing"</span>;
cannam@0 81 <a name="l00060"></a>00060 }
cannam@0 82 <a name="l00061"></a>00061
cannam@0 83 <a name="l00062"></a>00062 <span class="keywordtype">string</span>
cannam@0 84 <a name="l00063"></a><a class="code" href="classZeroCrossing.html#fa96f7ce6e7d9f03768f48c6a9d88498">00063</a> <a class="code" href="classZeroCrossing.html#fa96f7ce6e7d9f03768f48c6a9d88498" title="Get a human-readable name or title of the plugin.">ZeroCrossing::getName</a>()<span class="keyword"> const</span>
cannam@0 85 <a name="l00064"></a>00064 <span class="keyword"></span>{
cannam@0 86 <a name="l00065"></a>00065 <span class="keywordflow">return</span> <span class="stringliteral">"Zero Crossings"</span>;
cannam@0 87 <a name="l00066"></a>00066 }
cannam@0 88 <a name="l00067"></a>00067
cannam@0 89 <a name="l00068"></a>00068 <span class="keywordtype">string</span>
cannam@0 90 <a name="l00069"></a><a class="code" href="classZeroCrossing.html#710bb0b013157adaeef2a9e6867b4478">00069</a> <a class="code" href="classZeroCrossing.html#710bb0b013157adaeef2a9e6867b4478" title="Get a human-readable description for the plugin, typically a line of text that may...">ZeroCrossing::getDescription</a>()<span class="keyword"> const</span>
cannam@0 91 <a name="l00070"></a>00070 <span class="keyword"></span>{
cannam@0 92 <a name="l00071"></a>00071 <span class="keywordflow">return</span> <span class="stringliteral">"Detect and count zero crossing points"</span>;
cannam@0 93 <a name="l00072"></a>00072 }
cannam@0 94 <a name="l00073"></a>00073
cannam@0 95 <a name="l00074"></a>00074 <span class="keywordtype">string</span>
cannam@0 96 <a name="l00075"></a><a class="code" href="classZeroCrossing.html#c68561634a3c329a029c2fd3deaeae2a">00075</a> <a class="code" href="classZeroCrossing.html#c68561634a3c329a029c2fd3deaeae2a" title="Get the name of the author or vendor of the plugin in human-readable form.">ZeroCrossing::getMaker</a>()<span class="keyword"> const</span>
cannam@0 97 <a name="l00076"></a>00076 <span class="keyword"></span>{
cannam@0 98 <a name="l00077"></a>00077 <span class="keywordflow">return</span> <span class="stringliteral">"Vamp SDK Example Plugins"</span>;
cannam@0 99 <a name="l00078"></a>00078 }
cannam@0 100 <a name="l00079"></a>00079
cannam@0 101 <a name="l00080"></a>00080 <span class="keywordtype">int</span>
cannam@0 102 <a name="l00081"></a><a class="code" href="classZeroCrossing.html#d685f6c2f443f07a1634550c335571eb">00081</a> <a class="code" href="classZeroCrossing.html#d685f6c2f443f07a1634550c335571eb" title="Get the version number of the plugin.">ZeroCrossing::getPluginVersion</a>()<span class="keyword"> const</span>
cannam@0 103 <a name="l00082"></a>00082 <span class="keyword"></span>{
cannam@0 104 <a name="l00083"></a>00083 <span class="keywordflow">return</span> 2;
cannam@0 105 <a name="l00084"></a>00084 }
cannam@0 106 <a name="l00085"></a>00085
cannam@0 107 <a name="l00086"></a>00086 <span class="keywordtype">string</span>
cannam@0 108 <a name="l00087"></a><a class="code" href="classZeroCrossing.html#f9c41b92aa8ff8bddaebf75569ff789c">00087</a> <a class="code" href="classZeroCrossing.html#f9c41b92aa8ff8bddaebf75569ff789c" title="Get the copyright statement or licensing summary for the plugin.">ZeroCrossing::getCopyright</a>()<span class="keyword"> const</span>
cannam@0 109 <a name="l00088"></a>00088 <span class="keyword"></span>{
cannam@0 110 <a name="l00089"></a>00089 <span class="keywordflow">return</span> <span class="stringliteral">"Freely redistributable (BSD license)"</span>;
cannam@0 111 <a name="l00090"></a>00090 }
cannam@0 112 <a name="l00091"></a>00091
cannam@0 113 <a name="l00092"></a>00092 <span class="keywordtype">bool</span>
cannam@0 114 <a name="l00093"></a><a class="code" href="classZeroCrossing.html#f21bbcc87a6eb7875dfab7d86222dccc">00093</a> <a class="code" href="classZeroCrossing.html#f21bbcc87a6eb7875dfab7d86222dccc" title="Initialise a plugin to prepare it for use with the given number of input channels...">ZeroCrossing::initialise</a>(<span class="keywordtype">size_t</span> channels, <span class="keywordtype">size_t</span> stepSize, <span class="keywordtype">size_t</span> blockSize)
cannam@0 115 <a name="l00094"></a>00094 {
cannam@0 116 <a name="l00095"></a>00095 <span class="keywordflow">if</span> (channels &lt; <a class="code" href="classVamp_1_1Plugin.html#267b42e866df3cf0d190893e8096f525" title="Get the minimum supported number of input channels.">getMinChannelCount</a>() ||
cannam@0 117 <a name="l00096"></a>00096 channels &gt; <a class="code" href="classVamp_1_1Plugin.html#2c5ab12b6fa4847cb244bd1e9cb3ae5e" title="Get the maximum supported number of input channels.">getMaxChannelCount</a>()) <span class="keywordflow">return</span> <span class="keyword">false</span>;
cannam@0 118 <a name="l00097"></a>00097
cannam@0 119 <a name="l00098"></a>00098 <a class="code" href="classZeroCrossing.html#584f100b87c78f9af9da040d79567d52">m_stepSize</a> = std::min(stepSize, blockSize);
cannam@0 120 <a name="l00099"></a>00099
cannam@0 121 <a name="l00100"></a>00100 <span class="keywordflow">return</span> <span class="keyword">true</span>;
cannam@0 122 <a name="l00101"></a>00101 }
cannam@0 123 <a name="l00102"></a>00102
cannam@0 124 <a name="l00103"></a>00103 <span class="keywordtype">void</span>
cannam@0 125 <a name="l00104"></a><a class="code" href="classZeroCrossing.html#9ae6c4a31ea027dceb1e97ead807e228">00104</a> <a class="code" href="classZeroCrossing.html#9ae6c4a31ea027dceb1e97ead807e228" title="Reset the plugin after use, to prepare it for another clean run.">ZeroCrossing::reset</a>()
cannam@0 126 <a name="l00105"></a>00105 {
cannam@0 127 <a name="l00106"></a>00106 <a class="code" href="classZeroCrossing.html#0f2d9f2cab0a8a30344e1f2c0ebb8ee8">m_previousSample</a> = 0.0f;
cannam@0 128 <a name="l00107"></a>00107 }
cannam@0 129 <a name="l00108"></a>00108
cannam@0 130 <a name="l00109"></a>00109 <a class="code" href="classVamp_1_1Plugin.html#30f531b8fb69fac41a24e3d2a6a08ed9">ZeroCrossing::OutputList</a>
cannam@0 131 <a name="l00110"></a><a class="code" href="classZeroCrossing.html#c9d590a6feb1fc9a37d7892aefe2b688">00110</a> <a class="code" href="classZeroCrossing.html#c9d590a6feb1fc9a37d7892aefe2b688" title="Get the outputs of this plugin.">ZeroCrossing::getOutputDescriptors</a>()<span class="keyword"> const</span>
cannam@0 132 <a name="l00111"></a>00111 <span class="keyword"></span>{
cannam@0 133 <a name="l00112"></a>00112 <a class="code" href="classVamp_1_1Plugin.html#30f531b8fb69fac41a24e3d2a6a08ed9">OutputList</a> list;
cannam@0 134 <a name="l00113"></a>00113
cannam@0 135 <a name="l00114"></a>00114 <a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html">OutputDescriptor</a> zc;
cannam@0 136 <a name="l00115"></a>00115 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#e2c893ddb1860589517ab7eaa989a18b" title="The name of the output, in computer-usable form.">identifier</a> = <span class="stringliteral">"counts"</span>;
cannam@0 137 <a name="l00116"></a>00116 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#b824b2b34ee50f897a30901c620e8d87" title="The human-readable name of the output.">name</a> = <span class="stringliteral">"Zero Crossing Counts"</span>;
cannam@0 138 <a name="l00117"></a>00117 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#f9b4fe8f78e7126ead820ba5dc55efd1" title="A human-readable short text describing the output.">description</a> = <span class="stringliteral">"The number of zero crossing points per processing block"</span>;
cannam@0 139 <a name="l00118"></a>00118 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#a057a8833fa037f06ac9f7b85b85d5e4" title="The unit of the output, in human-readable form.">unit</a> = <span class="stringliteral">"crossings"</span>;
cannam@0 140 <a name="l00119"></a>00119 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#f0e577e1a256ff6eed6ea42133fec77d" 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@0 141 <a name="l00120"></a>00120 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#fdd006959a995e40ef7d565a3a4df6dc" title="The number of values per result of the output.">binCount</a> = 1;
cannam@0 142 <a name="l00121"></a>00121 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#e9ccb65f99f477096b65dd031f4c5e31" title="True if the results in each output bin fall within a fixed numeric range (minimum...">hasKnownExtents</a> = <span class="keyword">false</span>;
cannam@0 143 <a name="l00122"></a>00122 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#1b4858928d23bfd7d5bc557c82a83fb4" title="True if the output values are quantized to a particular resolution.">isQuantized</a> = <span class="keyword">true</span>;
cannam@0 144 <a name="l00123"></a>00123 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#3bed37153067b625b95acb40b60dbf0b" title="Quantization resolution of the output values (e.g.">quantizeStep</a> = 1.0;
cannam@0 145 <a name="l00124"></a>00124 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#0d1194980d44e31b25ef3b4b070d6b5d" title="Positioning in time of the output results.">sampleType</a> = <a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#bffa9ed50cd756df70fd51f0355f448c0459d5d0d2198d21e8bc90abe4fdccca" title="Results from each process() align with that call&amp;#39;s block start.">OutputDescriptor::OneSamplePerStep</a>;
cannam@0 146 <a name="l00125"></a>00125 list.push_back(zc);
cannam@0 147 <a name="l00126"></a>00126
cannam@0 148 <a name="l00127"></a>00127 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#e2c893ddb1860589517ab7eaa989a18b" title="The name of the output, in computer-usable form.">identifier</a> = <span class="stringliteral">"zerocrossings"</span>;
cannam@0 149 <a name="l00128"></a>00128 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#b824b2b34ee50f897a30901c620e8d87" title="The human-readable name of the output.">name</a> = <span class="stringliteral">"Zero Crossings"</span>;
cannam@0 150 <a name="l00129"></a>00129 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#f9b4fe8f78e7126ead820ba5dc55efd1" title="A human-readable short text describing the output.">description</a> = <span class="stringliteral">"The locations of zero crossing points"</span>;
cannam@0 151 <a name="l00130"></a>00130 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#a057a8833fa037f06ac9f7b85b85d5e4" title="The unit of the output, in human-readable form.">unit</a> = <span class="stringliteral">""</span>;
cannam@0 152 <a name="l00131"></a>00131 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#f0e577e1a256ff6eed6ea42133fec77d" 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@0 153 <a name="l00132"></a>00132 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#fdd006959a995e40ef7d565a3a4df6dc" title="The number of values per result of the output.">binCount</a> = 0;
cannam@0 154 <a name="l00133"></a>00133 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#0d1194980d44e31b25ef3b4b070d6b5d" title="Positioning in time of the output results.">sampleType</a> = <a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#bffa9ed50cd756df70fd51f0355f448cdea995a737867f7b22b52f1c43c5432e" title="Results are unevenly spaced and have individual timestamps.">OutputDescriptor::VariableSampleRate</a>;
cannam@0 155 <a name="l00134"></a>00134 zc.<a class="code" href="structVamp_1_1Plugin_1_1OutputDescriptor.html#dd0cbbdfa9c91764037c39365b1d42af" title="Sample rate of the output results, as samples per second.">sampleRate</a> = <a class="code" href="classVamp_1_1Plugin.html#59b9dd82a4f4eb946cd0474cc81abc23">m_inputSampleRate</a>;
cannam@0 156 <a name="l00135"></a>00135 list.push_back(zc);
cannam@0 157 <a name="l00136"></a>00136
cannam@0 158 <a name="l00137"></a>00137 <span class="keywordflow">return</span> list;
cannam@0 159 <a name="l00138"></a>00138 }
cannam@0 160 <a name="l00139"></a>00139
cannam@0 161 <a name="l00140"></a>00140 <a class="code" href="classVamp_1_1Plugin.html#448fb57dc245d47923ec9eeaf9856c5f">ZeroCrossing::FeatureSet</a>
cannam@0 162 <a name="l00141"></a><a class="code" href="classZeroCrossing.html#bf4aaa6fd8cc03de63f4e1e8942633da">00141</a> <a class="code" href="classZeroCrossing.html#bf4aaa6fd8cc03de63f4e1e8942633da" 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,
cannam@0 163 <a name="l00142"></a>00142 <a class="code" href="structVamp_1_1RealTime.html" title="RealTime represents time values to nanosecond precision with accurate arithmetic...">Vamp::RealTime</a> timestamp)
cannam@0 164 <a name="l00143"></a>00143 {
cannam@0 165 <a name="l00144"></a>00144 <span class="keywordflow">if</span> (<a class="code" href="classZeroCrossing.html#584f100b87c78f9af9da040d79567d52">m_stepSize</a> == 0) {
cannam@0 166 <a name="l00145"></a>00145 cerr &lt;&lt; <span class="stringliteral">"ERROR: ZeroCrossing::process: "</span>
cannam@0 167 <a name="l00146"></a>00146 &lt;&lt; <span class="stringliteral">"ZeroCrossing has not been initialised"</span>
cannam@0 168 <a name="l00147"></a>00147 &lt;&lt; endl;
cannam@0 169 <a name="l00148"></a>00148 <span class="keywordflow">return</span> <a class="code" href="classVamp_1_1Plugin.html#448fb57dc245d47923ec9eeaf9856c5f">FeatureSet</a>();
cannam@0 170 <a name="l00149"></a>00149 }
cannam@0 171 <a name="l00150"></a>00150
cannam@0 172 <a name="l00151"></a>00151 <span class="keywordtype">float</span> prev = <a class="code" href="classZeroCrossing.html#0f2d9f2cab0a8a30344e1f2c0ebb8ee8">m_previousSample</a>;
cannam@0 173 <a name="l00152"></a>00152 <span class="keywordtype">size_t</span> count = 0;
cannam@0 174 <a name="l00153"></a>00153
cannam@0 175 <a name="l00154"></a>00154 <a class="code" href="classVamp_1_1Plugin.html#448fb57dc245d47923ec9eeaf9856c5f">FeatureSet</a> returnFeatures;
cannam@0 176 <a name="l00155"></a>00155
cannam@0 177 <a name="l00156"></a>00156 <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i &lt; <a class="code" href="classZeroCrossing.html#584f100b87c78f9af9da040d79567d52">m_stepSize</a>; ++i) {
cannam@0 178 <a name="l00157"></a>00157
cannam@0 179 <a name="l00158"></a>00158 <span class="keywordtype">float</span> sample = inputBuffers[0][i];
cannam@0 180 <a name="l00159"></a>00159 <span class="keywordtype">bool</span> crossing = <span class="keyword">false</span>;
cannam@0 181 <a name="l00160"></a>00160
cannam@0 182 <a name="l00161"></a>00161 <span class="keywordflow">if</span> (sample &lt;= 0.0) {
cannam@0 183 <a name="l00162"></a>00162 <span class="keywordflow">if</span> (prev &gt; 0.0) crossing = <span class="keyword">true</span>;
cannam@0 184 <a name="l00163"></a>00163 } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (sample &gt; 0.0) {
cannam@0 185 <a name="l00164"></a>00164 <span class="keywordflow">if</span> (prev &lt;= 0.0) crossing = <span class="keyword">true</span>;
cannam@0 186 <a name="l00165"></a>00165 }
cannam@0 187 <a name="l00166"></a>00166
cannam@0 188 <a name="l00167"></a>00167 <span class="keywordflow">if</span> (crossing) {
cannam@0 189 <a name="l00168"></a>00168 ++count;
cannam@0 190 <a name="l00169"></a>00169 <a class="code" href="structVamp_1_1Plugin_1_1Feature.html">Feature</a> feature;
cannam@0 191 <a name="l00170"></a>00170 feature.<a class="code" href="structVamp_1_1Plugin_1_1Feature.html#98907091d0b6a589720ae35ae588a82b" title="True if an output feature has its own timestamp.">hasTimestamp</a> = <span class="keyword">true</span>;
cannam@0 192 <a name="l00171"></a>00171 feature.<a class="code" href="structVamp_1_1Plugin_1_1Feature.html#caa605f36839c07e76f4882f5e22d8d7" title="Timestamp of the output feature.">timestamp</a> = timestamp +
cannam@0 193 <a name="l00172"></a>00172 <a class="code" href="structVamp_1_1RealTime.html#3a5ecc8888b559aad3b7d96911786b3a" 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#59b9dd82a4f4eb946cd0474cc81abc23">m_inputSampleRate</a>);
cannam@0 194 <a name="l00173"></a>00173 returnFeatures[1].push_back(feature);
cannam@0 195 <a name="l00174"></a>00174 }
cannam@0 196 <a name="l00175"></a>00175
cannam@0 197 <a name="l00176"></a>00176 prev = sample;
cannam@0 198 <a name="l00177"></a>00177 }
cannam@0 199 <a name="l00178"></a>00178
cannam@0 200 <a name="l00179"></a>00179 <a class="code" href="classZeroCrossing.html#0f2d9f2cab0a8a30344e1f2c0ebb8ee8">m_previousSample</a> = prev;
cannam@0 201 <a name="l00180"></a>00180
cannam@0 202 <a name="l00181"></a>00181 <a class="code" href="structVamp_1_1Plugin_1_1Feature.html">Feature</a> feature;
cannam@0 203 <a name="l00182"></a>00182 feature.<a class="code" href="structVamp_1_1Plugin_1_1Feature.html#98907091d0b6a589720ae35ae588a82b" title="True if an output feature has its own timestamp.">hasTimestamp</a> = <span class="keyword">false</span>;
cannam@0 204 <a name="l00183"></a>00183 feature.<a class="code" href="structVamp_1_1Plugin_1_1Feature.html#60b9f3057386820dbcaec0eb1189ce71" title="Results for a single sample of this feature.">values</a>.push_back(count);
cannam@0 205 <a name="l00184"></a>00184
cannam@0 206 <a name="l00185"></a>00185 returnFeatures[0].push_back(feature);
cannam@0 207 <a name="l00186"></a>00186 <span class="keywordflow">return</span> returnFeatures;
cannam@0 208 <a name="l00187"></a>00187 }
cannam@0 209 <a name="l00188"></a>00188
cannam@0 210 <a name="l00189"></a>00189 <a class="code" href="classVamp_1_1Plugin.html#448fb57dc245d47923ec9eeaf9856c5f">ZeroCrossing::FeatureSet</a>
cannam@0 211 <a name="l00190"></a><a class="code" href="classZeroCrossing.html#70996d1b7166e303903daf92a9a37ad8">00190</a> <a class="code" href="classZeroCrossing.html#70996d1b7166e303903daf92a9a37ad8" title="After all blocks have been processed, calculate and return any remaining features...">ZeroCrossing::getRemainingFeatures</a>()
cannam@0 212 <a name="l00191"></a>00191 {
cannam@0 213 <a name="l00192"></a>00192 <span class="keywordflow">return</span> <a class="code" href="classVamp_1_1Plugin.html#448fb57dc245d47923ec9eeaf9856c5f">FeatureSet</a>();
cannam@0 214 <a name="l00193"></a>00193 }
cannam@0 215 <a name="l00194"></a>00194
cannam@0 216 </pre></div></div>
cannam@0 217 <hr size="1"><address style="text-align: right;"><small>Generated on Wed Jul 9 11:36:07 2008 for VampPluginSDK by&nbsp;
cannam@0 218 <a href="http://www.doxygen.org/index.html">
cannam@0 219 <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.5 </small></address>
cannam@0 220 </body>
cannam@0 221 </html>