adamstark@0: BTrack - A Real-Time Beat Tracker
adamstark@0: =================================
adamstark@0: 
adamstark@7: ** Version 0.9 **
adamstark@7: 
adamstark@7: *by Adam Stark, Matthew Davies and Mark Plumbley.*
adamstark@7: 
adamstark@7: 
adamstark@7: About BTrack
adamstark@7: ------------
adamstark@7: 
adamstark@30: BTrack is a causal beat tracking algorithm intended for real-time use. It is implemented in C++ with wrappers for Python and the Vamp plug-in framework.
adamstark@7: 
adamstark@7: Full details of the working of the algorithm can be found in:
adamstark@7: 
adamstark@7: * Musicians and Machines: Bridging the Semantic Gap in Live Performance, Chapter 3, A. M. Stark, PhD Thesis, Queen Mary, University of London, 2011.
adamstark@7: 
adamstark@7: * Real-Time Beat-Synchronous Analysis of Musical Audio, A. M. Stark, M. E. P. Davies and M. D. Plumbley. In Proceedings of the 12th International Conference on Digital Audio Effects (DAFx-09), Como, Italy, September 1-4, 2009.
adamstark@7: 
adamstark@7: 
adamstark@8: Versions
adamstark@8: --------
adamstark@8: 
adamstark@8: ==== 0.9 ====
adamstark@8: 
adamstark@8: * This is the original version of the BTrack algorithm
adamstark@8: 
adamstark@8: 
adamstark@8: 
adamstark@7: License
adamstark@7: -------
adamstark@7: 
adamstark@24: BTrack is made available under the GNU General Public License, version 3. Please see the included LICENSE.txt for more details.
adamstark@24: 
adamstark@24: Usage - C++
adamstark@24: -----------
adamstark@24: 
adamstark@24: **STEP 1**
adamstark@24: 
adamstark@24: Include the BTrack header file as follows:
adamstark@24: 
adamstark@24: 	#include "BTrack.h"
adamstark@24: 	
adamstark@24: **STEP 2**
adamstark@24: 
adamstark@24: Instantiate the algorithm by one of the following:
adamstark@24: 
adamstark@24: 	// to use the default 512 hop size and 1024 frame size
adamstark@24: 	BTrack b; 
adamstark@24: 
adamstark@24: or:	
adamstark@24: 
adamstark@24: 	// to specify a hop size (e.g. 512) and have a frame size of 2 x the hop size
adamstark@24: 	BTrack b(512); 
adamstark@24: 	
adamstark@24: or:
adamstark@24: 
adamstark@24: 	// to specify both the hop size and frame size
adamstark@24: 	BTrack b(512,1024);
adamstark@24: 	
adamstark@24: **STEP 3.1 - Audio Input**
adamstark@24: 
adamstark@24: In the processing loop, fill a double precision array with one frame of audio samples (as determined in step 2): 
adamstark@24: 
adamstark@24: 	double *frame; 
adamstark@24: 	
adamstark@24: 	// !
adamstark@24: 	// do something here to fill the frame with audio samples
adamstark@24: 	// !
adamstark@24: 
adamstark@24: and then call:
adamstark@24: 
adamstark@24: 	b.processAudioFrame(frame);
adamstark@24: 	
adamstark@24: and to check for beats, simply call:
adamstark@24: 
adamstark@24: 	if (b.beatDueInCurrentFrame())
adamstark@24: 	{
adamstark@24: 		// do something on the beat
adamstark@24: 	}
adamstark@24: 
adamstark@24: **STEP 3.2 - Onset Detection Function Input**	
adamstark@24: 
adamstark@24: The algorithm can process onset detection function samples. Given a double precision onset detection function sample called 'newSamples', at each step, call:
adamstark@24: 
adamstark@24: 	b.processOnsetDetectionFunctionSample(newSample);
adamstark@24: 	
adamstark@24: and then check for beats with:
adamstark@24: 
adamstark@24: 	if (b.beatDueInCurrentFrame())
adamstark@24: 	{
adamstark@24: 		// do something on the beat
adamstark@24: 	}