Mercurial > hg > btrack

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<div class="header">
  <div class="summary">
<a href="#pub-methods">Public Member Functions</a> &#124;
<a href="#pub-static-methods">Static Public Member Functions</a> &#124;
<a href="class_b_track-members.html">List of all members</a>  </div>
  <div class="headertitle"><div class="title">BTrack Class Reference</div></div>
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<p><code>#include &lt;<a class="el" href="_b_track_8h_source.html">BTrack.h</a>&gt;</code></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="pub-methods" name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:a243ac408666ce0301fecd9b0a2a6f307"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_b_track.html#a243ac408666ce0301fecd9b0a2a6f307">BTrack</a> ()</td></tr>
<tr class="separator:a243ac408666ce0301fecd9b0a2a6f307"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a8bc0e4933dcec6ced684d69d9c9e5014"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_b_track.html#a8bc0e4933dcec6ced684d69d9c9e5014">BTrack</a> (int hopSize)</td></tr>
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<tr class="memitem:a7196e2dcb729c1bd6e09a9494a6be1f4"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_b_track.html#a7196e2dcb729c1bd6e09a9494a6be1f4">BTrack</a> (int hopSize, int frameSize)</td></tr>
<tr class="separator:a7196e2dcb729c1bd6e09a9494a6be1f4"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a386413d90e57d0a2cf7f18413338bbaf"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_b_track.html#a386413d90e57d0a2cf7f18413338bbaf">~BTrack</a> ()</td></tr>
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<tr class="memitem:adda9c1b3a9e3fc02accfacc9d144e33d"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_b_track.html#adda9c1b3a9e3fc02accfacc9d144e33d">updateHopAndFrameSize</a> (int hopSize, int frameSize)</td></tr>
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<tr class="memitem:abb7ce7253095e6f859ef7b30f06ce051"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_b_track.html#abb7ce7253095e6f859ef7b30f06ce051">processAudioFrame</a> (double *frame)</td></tr>
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<tr class="memitem:a6fab18732bef8c87152e93dec9e4f854"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_b_track.html#a6fab18732bef8c87152e93dec9e4f854">processOnsetDetectionFunctionSample</a> (double sample)</td></tr>
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<tr class="memitem:ac06aa079977062bfa2930cdca45e69fb"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_b_track.html#ac06aa079977062bfa2930cdca45e69fb">getHopSize</a> ()</td></tr>
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<tr class="memitem:ac92eaea0e42dd18c79de10bf852d7f4a"><td class="memItemLeft" align="right" valign="top">bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_b_track.html#ac92eaea0e42dd18c79de10bf852d7f4a">beatDueInCurrentFrame</a> ()</td></tr>
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<tr class="memitem:a17cea0a4dff3908660e4117e9a6c42bb"><td class="memItemLeft" align="right" valign="top">double&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_b_track.html#a17cea0a4dff3908660e4117e9a6c42bb">getCurrentTempoEstimate</a> ()</td></tr>
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<tr class="memitem:a7ccb5059d0f00e3217ea686e4c1e156d"><td class="memItemLeft" align="right" valign="top">double&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_b_track.html#a7ccb5059d0f00e3217ea686e4c1e156d">getLatestCumulativeScoreValue</a> ()</td></tr>
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<tr class="memitem:a96cf4088e40dff66ce15ada1f671a186"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_b_track.html#a96cf4088e40dff66ce15ada1f671a186">setTempo</a> (double tempo)</td></tr>
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<tr class="memitem:a550829be9b4c58cd53195ec4900c7c71"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_b_track.html#a550829be9b4c58cd53195ec4900c7c71">fixTempo</a> (double tempo)</td></tr>
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<tr class="memitem:a22917ea231d2efd5670a764dd5a98983"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_b_track.html#a22917ea231d2efd5670a764dd5a98983">doNotFixTempo</a> ()</td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="pub-static-methods" name="pub-static-methods"></a>
Static Public Member Functions</h2></td></tr>
<tr class="memitem:aa66d0b9dfb4408e8cf84398f03b60a56"><td class="memItemLeft" align="right" valign="top">static double&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_b_track.html#aa66d0b9dfb4408e8cf84398f03b60a56">getBeatTimeInSeconds</a> (long frameNumber, int hopSize, int fs)</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>The main beat tracking class and the interface to the <a class="el" href="class_b_track.html">BTrack</a> beat tracking algorithm. The algorithm can process either audio frames or onset detection function samples and also contains some static functions for calculating beat times in seconds </p>
</div><h2 class="groupheader">Constructor &amp; Destructor Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#a243ac408666ce0301fecd9b0a2a6f307">&#9670;&#160;</a></span>BTrack() <span class="overload">[1/3]</span></h2>

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          <td class="memname">BTrack::BTrack </td>
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<p>Constructor assuming hop size of 512 and frame size of 1024 </p>

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<h2 class="memtitle"><span class="permalink"><a href="#a8bc0e4933dcec6ced684d69d9c9e5014">&#9670;&#160;</a></span>BTrack() <span class="overload">[2/3]</span></h2>

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          <td class="paramname"><em>hopSize</em></td><td>)</td>
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<p>Constructor assuming frame size will be double the hopSize </p><dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">hopSize</td><td>the hop size in audio samples </td></tr>
  </table>
  </dd>
</dl>

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<h2 class="memtitle"><span class="permalink"><a href="#a7196e2dcb729c1bd6e09a9494a6be1f4">&#9670;&#160;</a></span>BTrack() <span class="overload">[3/3]</span></h2>

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          <td class="paramtype">int&#160;</td>
          <td class="paramname"><em>hopSize</em>, </td>
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          <td class="paramkey"></td>
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          <td class="paramtype">int&#160;</td>
          <td class="paramname"><em>frameSize</em>&#160;</td>
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<p>Constructor taking both hopSize and frameSize </p><dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">hopSize</td><td>the hop size in audio samples </td></tr>
    <tr><td class="paramname">frameSize</td><td>the frame size in audio samples </td></tr>
  </table>
  </dd>
</dl>

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<h2 class="memtitle"><span class="permalink"><a href="#a386413d90e57d0a2cf7f18413338bbaf">&#9670;&#160;</a></span>~BTrack()</h2>

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<p>Destructor </p>

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<h2 class="groupheader">Member Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#ac92eaea0e42dd18c79de10bf852d7f4a">&#9670;&#160;</a></span>beatDueInCurrentFrame()</h2>

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          <td class="memname">bool BTrack::beatDueInCurrentFrame </td>
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<dl class="section return"><dt>Returns</dt><dd>true if a beat should occur in the current audio frame </dd></dl>

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<h2 class="memtitle"><span class="permalink"><a href="#a22917ea231d2efd5670a764dd5a98983">&#9670;&#160;</a></span>doNotFixTempo()</h2>

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          <td class="memname">void BTrack::doNotFixTempo </td>
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<p>Tell the algorithm to not fix the tempo anymore </p>

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<h2 class="memtitle"><span class="permalink"><a href="#a550829be9b4c58cd53195ec4900c7c71">&#9670;&#160;</a></span>fixTempo()</h2>

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          <td class="memname">void BTrack::fixTempo </td>
          <td>(</td>
          <td class="paramtype">double&#160;</td>
          <td class="paramname"><em>tempo</em></td><td>)</td>
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<p>Fix tempo to roughly around some value, so that the algorithm will only try to track tempi around the given tempo </p><dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">tempo</td><td>the tempo in beats per minute (bpm) </td></tr>
  </table>
  </dd>
</dl>

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<h2 class="memtitle"><span class="permalink"><a href="#aa66d0b9dfb4408e8cf84398f03b60a56">&#9670;&#160;</a></span>getBeatTimeInSeconds()</h2>

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          <td class="paramtype">long&#160;</td>
          <td class="paramname"><em>frameNumber</em>, </td>
        </tr>
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          <td class="paramkey"></td>
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          <td class="paramtype">int&#160;</td>
          <td class="paramname"><em>hopSize</em>, </td>
        </tr>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">int&#160;</td>
          <td class="paramname"><em>fs</em>&#160;</td>
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<p>Calculates a beat time in seconds, given the frame number, hop size and sampling frequency. This version uses a long to represent the frame number </p><dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">frameNumber</td><td>the index of the current frame </td></tr>
    <tr><td class="paramname">hopSize</td><td>the hop size in audio samples </td></tr>
    <tr><td class="paramname">fs</td><td>the sampling frequency in Hz </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>a beat time in seconds </dd></dl>

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<h2 class="memtitle"><span class="permalink"><a href="#a17cea0a4dff3908660e4117e9a6c42bb">&#9670;&#160;</a></span>getCurrentTempoEstimate()</h2>

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<dl class="section return"><dt>Returns</dt><dd>the current tempo estimate being used by the beat tracker </dd></dl>

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<h2 class="memtitle"><span class="permalink"><a href="#ac06aa079977062bfa2930cdca45e69fb">&#9670;&#160;</a></span>getHopSize()</h2>

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          <td class="memname">int BTrack::getHopSize </td>
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<dl class="section return"><dt>Returns</dt><dd>the current hop size being used by the beat tracker </dd></dl>

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<h2 class="memtitle"><span class="permalink"><a href="#a7ccb5059d0f00e3217ea686e4c1e156d">&#9670;&#160;</a></span>getLatestCumulativeScoreValue()</h2>

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<dl class="section return"><dt>Returns</dt><dd>the most recent value of the cumulative score function </dd></dl>

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<h2 class="memtitle"><span class="permalink"><a href="#abb7ce7253095e6f859ef7b30f06ce051">&#9670;&#160;</a></span>processAudioFrame()</h2>

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          <td class="memname">void BTrack::processAudioFrame </td>
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          <td class="paramname"><em>frame</em></td><td>)</td>
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<p>Process a single audio frame </p><dl class="params"><dt>Parameters</dt><dd>
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    <tr><td class="paramname">frame</td><td>a pointer to an array containing an audio frame. The number of samples should match the frame size that the algorithm was initialised with. </td></tr>
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<h2 class="memtitle"><span class="permalink"><a href="#a6fab18732bef8c87152e93dec9e4f854">&#9670;&#160;</a></span>processOnsetDetectionFunctionSample()</h2>

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<p>Add new onset detection function sample to buffer and apply beat tracking </p><dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">sample</td><td>an onset detection function sample </td></tr>
  </table>
  </dd>
</dl>

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<h2 class="memtitle"><span class="permalink"><a href="#a96cf4088e40dff66ce15ada1f671a186">&#9670;&#160;</a></span>setTempo()</h2>

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<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">void BTrack::setTempo </td>
          <td>(</td>
          <td class="paramtype">double&#160;</td>
          <td class="paramname"><em>tempo</em></td><td>)</td>
          <td></td>
        </tr>
      </table>
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<p>Set the tempo of the beat tracker </p><dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">tempo</td><td>the tempo in beats per minute (bpm) </td></tr>
  </table>
  </dd>
</dl>

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<h2 class="memtitle"><span class="permalink"><a href="#adda9c1b3a9e3fc02accfacc9d144e33d">&#9670;&#160;</a></span>updateHopAndFrameSize()</h2>

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<div class="memproto">
      <table class="memname">
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          <td class="memname">void BTrack::updateHopAndFrameSize </td>
          <td>(</td>
          <td class="paramtype">int&#160;</td>
          <td class="paramname"><em>hopSize</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">int&#160;</td>
          <td class="paramname"><em>frameSize</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
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<p>Updates the hop and frame size used by the beat tracker </p><dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">hopSize</td><td>the hop size in audio samples </td></tr>
    <tr><td class="paramname">frameSize</td><td>the frame size in audio samples </td></tr>
  </table>
  </dd>
</dl>

</div>
</div>
<hr/>The documentation for this class was generated from the following files:<ul>
<li>src/<a class="el" href="_b_track_8h_source.html">BTrack.h</a></li>
<li>src/<a class="el" href="_b_track_8cpp.html">BTrack.cpp</a></li>
</ul>
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author	Adam Stark <adamstark.uk@gmail.com>
date	Fri, 18 Aug 2023 20:07:33 +0200
parents	d6d9df2db3e1
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