BPMDetect.h

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//
// Last changed  : $Date$
// File revision : $Revision$
//
// $Id$
//
//
// License :
//
//  SoundTouch audio processing library
//  Copyright (c) Olli Parviainen
//
//  This library is free software; you can redistribute it and/or
//  modify it under the terms of the GNU Lesser General Public
//  License as published by the Free Software Foundation; either
//  version 2.1 of the License, or (at your option) any later version.
//
//  This library is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
//  Lesser General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public
//  License along with this library; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//

#ifndef _BPMDetect_H_
#define _BPMDetect_H_

#include "STTypes.h"
#include "FIFOSampleBuffer.h"

#define MIN_BPM 45

#define MAX_BPM 230


class BPMDetect
{
protected:
    float *xcorr;
    
    float envelopeAccu;

    float RMSVolumeAccu;

    int decimateCount;

    soundtouch::LONG_SAMPLETYPE decimateSum;

    int decimateBy;

    int windowLen;

    int channels;

    int sampleRate;

    int windowStart;
 
    soundtouch::FIFOSampleBuffer *buffer;

    void init(int numChannels, int sampleRate);

    void updateXCorr(int process_samples      
                     );

    int decimate(soundtouch::SAMPLETYPE *dest,      
                 const soundtouch::SAMPLETYPE *src, 
                 int numsamples                     
                 );

    void calcEnvelope(soundtouch::SAMPLETYPE *samples,  
                      int numsamples                    
                      );

public:
    BPMDetect(int numChannels,  
              int sampleRate    
              );

    virtual ~BPMDetect();

    void inputSamples(soundtouch::SAMPLETYPE *samples,  
                      int numSamples                    
                      );


    float getBpm();
};

#endif // _BPMDetect_H_

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