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Did more commenting. Added documentation.
author Adam Stark <adamstark@users.noreply.github.com>
date Sat, 25 Jan 2014 18:17:51 +0000
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59:ba3fc238ccad 60:bf256abf1dd4
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6 <title>BTrack - A Real-Time Beat Tracker: BTrack Class Reference</title>
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85 <a href="class_b_track-members.html">List of all members</a> </div>
86 <div class="headertitle">
87 <div class="title">BTrack Class Reference</div> </div>
88 </div><!--header-->
89 <div class="contents">
90
91 <p><code>#include &lt;<a class="el" href="_b_track_8h_source.html">BTrack.h</a>&gt;</code></p>
92 <table class="memberdecls">
93 <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
94 Public Member Functions</h2></td></tr>
95 <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>
96 <tr class="separator:a243ac408666ce0301fecd9b0a2a6f307"><td class="memSeparator" colspan="2">&#160;</td></tr>
97 <tr class="memitem:ac4dbda7c90ce1a3080def2d5da875171"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_b_track.html#ac4dbda7c90ce1a3080def2d5da875171">BTrack</a> (int hopSize_)</td></tr>
98 <tr class="separator:ac4dbda7c90ce1a3080def2d5da875171"><td class="memSeparator" colspan="2">&#160;</td></tr>
99 <tr class="memitem:afce9e207a2f6ff71d96125dee16797de"><td class="memItemLeft" align="right" valign="top">&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_b_track.html#afce9e207a2f6ff71d96125dee16797de">BTrack</a> (int hopSize_, int frameSize_)</td></tr>
100 <tr class="separator:afce9e207a2f6ff71d96125dee16797de"><td class="memSeparator" colspan="2">&#160;</td></tr>
101 <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>
102 <tr class="separator:abb7ce7253095e6f859ef7b30f06ce051"><td class="memSeparator" colspan="2">&#160;</td></tr>
103 <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>
104 <tr class="separator:a6fab18732bef8c87152e93dec9e4f854"><td class="memSeparator" colspan="2">&#160;</td></tr>
105 <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>
106 <tr class="separator:ac06aa079977062bfa2930cdca45e69fb"><td class="memSeparator" colspan="2">&#160;</td></tr>
107 <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>
108 <tr class="separator:ac92eaea0e42dd18c79de10bf852d7f4a"><td class="memSeparator" colspan="2">&#160;</td></tr>
109 <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>
110 <tr class="separator:a17cea0a4dff3908660e4117e9a6c42bb"><td class="memSeparator" colspan="2">&#160;</td></tr>
111 <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>
112 <tr class="separator:a7ccb5059d0f00e3217ea686e4c1e156d"><td class="memSeparator" colspan="2">&#160;</td></tr>
113 <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>
114 <tr class="separator:a96cf4088e40dff66ce15ada1f671a186"><td class="memSeparator" colspan="2">&#160;</td></tr>
115 <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>
116 <tr class="separator:a550829be9b4c58cd53195ec4900c7c71"><td class="memSeparator" colspan="2">&#160;</td></tr>
117 <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>
118 <tr class="separator:a22917ea231d2efd5670a764dd5a98983"><td class="memSeparator" colspan="2">&#160;</td></tr>
119 </table><table class="memberdecls">
120 <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-static-methods"></a>
121 Static Public Member Functions</h2></td></tr>
122 <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>
123 <tr class="separator:aa66d0b9dfb4408e8cf84398f03b60a56"><td class="memSeparator" colspan="2">&#160;</td></tr>
124 <tr class="memitem:a1ebb4312fed8cf1de5353fef68c0fe74"><td class="memItemLeft" align="right" valign="top">static double&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_b_track.html#a1ebb4312fed8cf1de5353fef68c0fe74">getBeatTimeInSeconds</a> (int frameNumber, int hopSize, int fs)</td></tr>
125 <tr class="separator:a1ebb4312fed8cf1de5353fef68c0fe74"><td class="memSeparator" colspan="2">&#160;</td></tr>
126 </table>
127 <a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
128 <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>
129 </div><h2 class="groupheader">Constructor &amp; Destructor Documentation</h2>
130 <a class="anchor" id="a243ac408666ce0301fecd9b0a2a6f307"></a>
131 <div class="memitem">
132 <div class="memproto">
133 <table class="memname">
134 <tr>
135 <td class="memname">BTrack::BTrack </td>
136 <td>(</td>
137 <td class="paramname"></td><td>)</td>
138 <td></td>
139 </tr>
140 </table>
141 </div><div class="memdoc">
142 <p>constructor assuming hop size of 512 and frame size of 1024 </p>
143
144 </div>
145 </div>
146 <a class="anchor" id="ac4dbda7c90ce1a3080def2d5da875171"></a>
147 <div class="memitem">
148 <div class="memproto">
149 <table class="memname">
150 <tr>
151 <td class="memname">BTrack::BTrack </td>
152 <td>(</td>
153 <td class="paramtype">int&#160;</td>
154 <td class="paramname"><em>hopSize_</em></td><td>)</td>
155 <td></td>
156 </tr>
157 </table>
158 </div><div class="memdoc">
159 <p>constructor assuming frame size will be double the hopSize </p>
160 <dl class="params"><dt>Parameters</dt><dd>
161 <table class="params">
162 <tr><td class="paramname">hopSize</td><td>the hop size in audio samples </td></tr>
163 </table>
164 </dd>
165 </dl>
166
167 </div>
168 </div>
169 <a class="anchor" id="afce9e207a2f6ff71d96125dee16797de"></a>
170 <div class="memitem">
171 <div class="memproto">
172 <table class="memname">
173 <tr>
174 <td class="memname">BTrack::BTrack </td>
175 <td>(</td>
176 <td class="paramtype">int&#160;</td>
177 <td class="paramname"><em>hopSize_</em>, </td>
178 </tr>
179 <tr>
180 <td class="paramkey"></td>
181 <td></td>
182 <td class="paramtype">int&#160;</td>
183 <td class="paramname"><em>frameSize_</em>&#160;</td>
184 </tr>
185 <tr>
186 <td></td>
187 <td>)</td>
188 <td></td><td></td>
189 </tr>
190 </table>
191 </div><div class="memdoc">
192 <p>constructor taking both hopSize and frameSize </p>
193 <dl class="params"><dt>Parameters</dt><dd>
194 <table class="params">
195 <tr><td class="paramname">hopSize</td><td>the hop size in audio samples </td></tr>
196 <tr><td class="paramname">frameSize</td><td>the frame size in audio samples </td></tr>
197 </table>
198 </dd>
199 </dl>
200
201 </div>
202 </div>
203 <h2 class="groupheader">Member Function Documentation</h2>
204 <a class="anchor" id="ac92eaea0e42dd18c79de10bf852d7f4a"></a>
205 <div class="memitem">
206 <div class="memproto">
207 <table class="memname">
208 <tr>
209 <td class="memname">bool BTrack::beatDueInCurrentFrame </td>
210 <td>(</td>
211 <td class="paramname"></td><td>)</td>
212 <td></td>
213 </tr>
214 </table>
215 </div><div class="memdoc">
216 <dl class="section return"><dt>Returns</dt><dd>true if a beat should occur in the current audio frame </dd></dl>
217
218 </div>
219 </div>
220 <a class="anchor" id="a22917ea231d2efd5670a764dd5a98983"></a>
221 <div class="memitem">
222 <div class="memproto">
223 <table class="memname">
224 <tr>
225 <td class="memname">void BTrack::doNotFixTempo </td>
226 <td>(</td>
227 <td class="paramname"></td><td>)</td>
228 <td></td>
229 </tr>
230 </table>
231 </div><div class="memdoc">
232 <p>tell the algorithm to not fix the tempo anymore </p>
233
234 </div>
235 </div>
236 <a class="anchor" id="a550829be9b4c58cd53195ec4900c7c71"></a>
237 <div class="memitem">
238 <div class="memproto">
239 <table class="memname">
240 <tr>
241 <td class="memname">void BTrack::fixTempo </td>
242 <td>(</td>
243 <td class="paramtype">double&#160;</td>
244 <td class="paramname"><em>tempo</em></td><td>)</td>
245 <td></td>
246 </tr>
247 </table>
248 </div><div class="memdoc">
249 <p>fix tempo to roughly around some value, so that the algorithm will only try to track tempi around the given tempo </p>
250 <dl class="params"><dt>Parameters</dt><dd>
251 <table class="params">
252 <tr><td class="paramname">tempo</td><td>the tempo in beats per minute (bpm) </td></tr>
253 </table>
254 </dd>
255 </dl>
256
257 </div>
258 </div>
259 <a class="anchor" id="aa66d0b9dfb4408e8cf84398f03b60a56"></a>
260 <div class="memitem">
261 <div class="memproto">
262 <table class="mlabels">
263 <tr>
264 <td class="mlabels-left">
265 <table class="memname">
266 <tr>
267 <td class="memname">double BTrack::getBeatTimeInSeconds </td>
268 <td>(</td>
269 <td class="paramtype">long&#160;</td>
270 <td class="paramname"><em>frameNumber</em>, </td>
271 </tr>
272 <tr>
273 <td class="paramkey"></td>
274 <td></td>
275 <td class="paramtype">int&#160;</td>
276 <td class="paramname"><em>hopSize</em>, </td>
277 </tr>
278 <tr>
279 <td class="paramkey"></td>
280 <td></td>
281 <td class="paramtype">int&#160;</td>
282 <td class="paramname"><em>fs</em>&#160;</td>
283 </tr>
284 <tr>
285 <td></td>
286 <td>)</td>
287 <td></td><td></td>
288 </tr>
289 </table>
290 </td>
291 <td class="mlabels-right">
292 <span class="mlabels"><span class="mlabel">static</span></span> </td>
293 </tr>
294 </table>
295 </div><div class="memdoc">
296 <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>
297 <dl class="params"><dt>Parameters</dt><dd>
298 <table class="params">
299 <tr><td class="paramname">frameNumber</td><td>the index of the current frame </td></tr>
300 <tr><td class="paramname">hopSize</td><td>the hop size in audio samples </td></tr>
301 <tr><td class="paramname">fs</td><td>the sampling frequency in Hz </td></tr>
302 </table>
303 </dd>
304 </dl>
305 <dl class="section return"><dt>Returns</dt><dd>a beat time in seconds </dd></dl>
306
307 </div>
308 </div>
309 <a class="anchor" id="a1ebb4312fed8cf1de5353fef68c0fe74"></a>
310 <div class="memitem">
311 <div class="memproto">
312 <table class="mlabels">
313 <tr>
314 <td class="mlabels-left">
315 <table class="memname">
316 <tr>
317 <td class="memname">double BTrack::getBeatTimeInSeconds </td>
318 <td>(</td>
319 <td class="paramtype">int&#160;</td>
320 <td class="paramname"><em>frameNumber</em>, </td>
321 </tr>
322 <tr>
323 <td class="paramkey"></td>
324 <td></td>
325 <td class="paramtype">int&#160;</td>
326 <td class="paramname"><em>hopSize</em>, </td>
327 </tr>
328 <tr>
329 <td class="paramkey"></td>
330 <td></td>
331 <td class="paramtype">int&#160;</td>
332 <td class="paramname"><em>fs</em>&#160;</td>
333 </tr>
334 <tr>
335 <td></td>
336 <td>)</td>
337 <td></td><td></td>
338 </tr>
339 </table>
340 </td>
341 <td class="mlabels-right">
342 <span class="mlabels"><span class="mlabel">static</span></span> </td>
343 </tr>
344 </table>
345 </div><div class="memdoc">
346 <p>calculates a beat time in seconds, given the frame number, hop size and sampling frequency. This version uses an int to represent the frame number </p>
347 <dl class="params"><dt>Parameters</dt><dd>
348 <table class="params">
349 <tr><td class="paramname">frameNumber</td><td>the index of the current frame </td></tr>
350 <tr><td class="paramname">hopSize</td><td>the hop size in audio samples </td></tr>
351 <tr><td class="paramname">fs</td><td>the sampling frequency in Hz </td></tr>
352 </table>
353 </dd>
354 </dl>
355 <dl class="section return"><dt>Returns</dt><dd>a beat time in seconds </dd></dl>
356
357 </div>
358 </div>
359 <a class="anchor" id="a17cea0a4dff3908660e4117e9a6c42bb"></a>
360 <div class="memitem">
361 <div class="memproto">
362 <table class="memname">
363 <tr>
364 <td class="memname">double BTrack::getCurrentTempoEstimate </td>
365 <td>(</td>
366 <td class="paramname"></td><td>)</td>
367 <td></td>
368 </tr>
369 </table>
370 </div><div class="memdoc">
371 <dl class="section return"><dt>Returns</dt><dd>the current tempo estimate being used by the beat tracker </dd></dl>
372
373 </div>
374 </div>
375 <a class="anchor" id="ac06aa079977062bfa2930cdca45e69fb"></a>
376 <div class="memitem">
377 <div class="memproto">
378 <table class="memname">
379 <tr>
380 <td class="memname">int BTrack::getHopSize </td>
381 <td>(</td>
382 <td class="paramname"></td><td>)</td>
383 <td></td>
384 </tr>
385 </table>
386 </div><div class="memdoc">
387 <dl class="section return"><dt>Returns</dt><dd>the current hop size being used by the beat tracker </dd></dl>
388
389 </div>
390 </div>
391 <a class="anchor" id="a7ccb5059d0f00e3217ea686e4c1e156d"></a>
392 <div class="memitem">
393 <div class="memproto">
394 <table class="memname">
395 <tr>
396 <td class="memname">double BTrack::getLatestCumulativeScoreValue </td>
397 <td>(</td>
398 <td class="paramname"></td><td>)</td>
399 <td></td>
400 </tr>
401 </table>
402 </div><div class="memdoc">
403 <dl class="section return"><dt>Returns</dt><dd>the most recent value of the cumulative score function </dd></dl>
404
405 </div>
406 </div>
407 <a class="anchor" id="abb7ce7253095e6f859ef7b30f06ce051"></a>
408 <div class="memitem">
409 <div class="memproto">
410 <table class="memname">
411 <tr>
412 <td class="memname">void BTrack::processAudioFrame </td>
413 <td>(</td>
414 <td class="paramtype">double *&#160;</td>
415 <td class="paramname"><em>frame</em></td><td>)</td>
416 <td></td>
417 </tr>
418 </table>
419 </div><div class="memdoc">
420 <p>Process a single audio frame </p>
421 <dl class="params"><dt>Parameters</dt><dd>
422 <table class="params">
423 <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>
424 </table>
425 </dd>
426 </dl>
427
428 </div>
429 </div>
430 <a class="anchor" id="a6fab18732bef8c87152e93dec9e4f854"></a>
431 <div class="memitem">
432 <div class="memproto">
433 <table class="memname">
434 <tr>
435 <td class="memname">void BTrack::processOnsetDetectionFunctionSample </td>
436 <td>(</td>
437 <td class="paramtype">double&#160;</td>
438 <td class="paramname"><em>sample</em></td><td>)</td>
439 <td></td>
440 </tr>
441 </table>
442 </div><div class="memdoc">
443 <p>Add new onset detection function sample to buffer and apply beat tracking </p>
444 <dl class="params"><dt>Parameters</dt><dd>
445 <table class="params">
446 <tr><td class="paramname">sample</td><td>an onset detection function sample </td></tr>
447 </table>
448 </dd>
449 </dl>
450
451 </div>
452 </div>
453 <a class="anchor" id="a96cf4088e40dff66ce15ada1f671a186"></a>
454 <div class="memitem">
455 <div class="memproto">
456 <table class="memname">
457 <tr>
458 <td class="memname">void BTrack::setTempo </td>
459 <td>(</td>
460 <td class="paramtype">double&#160;</td>
461 <td class="paramname"><em>tempo</em></td><td>)</td>
462 <td></td>
463 </tr>
464 </table>
465 </div><div class="memdoc">
466 <p>Set the tempo of the beat tracker </p>
467 <dl class="params"><dt>Parameters</dt><dd>
468 <table class="params">
469 <tr><td class="paramname">tempo</td><td>the tempo in beats per minute (bpm) </td></tr>
470 </table>
471 </dd>
472 </dl>
473
474 </div>
475 </div>
476 <hr/>The documentation for this class was generated from the following files:<ul>
477 <li>src/<a class="el" href="_b_track_8h_source.html">BTrack.h</a></li>
478 <li>src/<a class="el" href="_b_track_8cpp.html">BTrack.cpp</a></li>
479 </ul>
480 </div><!-- contents -->
481 <!-- start footer part -->
482 <hr class="footer"/><address class="footer"><small>
483 Generated on Sat Jan 25 2014 18:11:17 for BTrack - A Real-Time Beat Tracker by &#160;<a href="http://www.doxygen.org/index.html">
484 <img class="footer" src="doxygen.png" alt="doxygen"/>
485 </a> 1.8.2
486 </small></address>
487 </body>
488 </html>