BTrack - A Real-Time Beat Tracker: BTrack

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A real-time beat tracker, implemented in C++.

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Written by Adam Stark, Matthew Davies and Mark Plumbley.

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License

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BTrack is made available under the GNU General Public License, version 3. Please see the included LICENSE.txt for more details.

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Usage - C++

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STEP 1

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Include the BTrack header file as follows:

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    #include "BTrack.h"
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STEP 2

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Instantiate the algorithm by one of the following:

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// to use the default 512 hop size and 1024 frame size
adamstark@24: BTrack b; 
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or:

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// to specify a hop size (e.g. 512) and have a frame size of 2 x the hop size
adamstark@24: BTrack b(512); 
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or:

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// to specify both the hop size and frame size
adamstark@24: BTrack b(512,1024);
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STEP 3.1 - Audio Input

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In the processing loop, fill a double precision array with one frame of audio samples (as determined in step 2):

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double *frame; 
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adamstark@24: // !
adamstark@24: // do something here to fill the frame with audio samples
adamstark@24: // !
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and then call:

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b.processAudioFrame(frame);
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and to check for beats, simply call:

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if (b.beatDueInCurrentFrame())
adamstark@24: {
adamstark@24:     // do something on the beat
adamstark@24: }
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STEP 3.2 - Onset Detection Function Input

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The algorithm can process onset detection function samples. Given a double precision onset detection function sample called 'newSamples', at each step, call:

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b.processOnsetDetectionFunctionSample(newSample);
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and then check for beats with:

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if (b.beatDueInCurrentFrame())
adamstark@24: {
adamstark@24:     // do something on the beat
adamstark@24: }
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For any questions, please email Adam Stark (email at http://www.adamstark.co.uk).

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