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gx_pitch_tracker.h

/*
 * Copyright (C) 2009, 2010 Hermann Meyer, James Warden, Andreas Degert
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 * --------------------------------------------------------------------------
 */

/* ------- This is the guitarix Engine namespace ------- */

#pragma once

#include <zita-resampler.h>

namespace gx_engine
{
/* ------------- Pitch Tracker ------------- */

const int MAX_FFT_SIZE = 512; // The size of the read buffer (max FFT window size).

class PitchTracker
{
public:
      PitchTracker();
      ~PitchTracker();
      bool setParameters( int sampleRate, int fftSize );
      void init() { setParameters((int)gx_jack::jack_sr, MAX_FFT_SIZE); }
      void add(int count, float *input);
      float tuner_estimate();

private:
      void run();
      static void *static_run(void*);
      void setEstimatedFrequency(float freq);
      int find_minimum();
      int find_maximum(int l);
      void start_thread();
      void copy();
      bool error;
      volatile bool busy;
      int tick;
    sem_t m_trig;
    pthread_t m_pthr;
      Resampler resamp;
      int m_sampleRate;
      int   m_fftSize; // Size of the FFT window.
      float *m_buffer; // The audio buffer that stores the input signal.
      int m_bufferIndex; // Index of the first empty position in the buffer.
      bool m_audioLevel; // Whether or not the input level is high enough.
      float *m_fftwBufferTime; // Support buffer used to store signals in the time domain.
      fftwf_complex *m_fftwBufferFreq; // Support buffer used to store signals in the frequency domain.
      fftwf_plan m_fftwPlanFFT; // Plan to compute the FFT of a given signal.
      fftwf_plan m_fftwPlanIFFT; // Plan to compute the IFFT of a given signal (with additional zero-padding).
};

extern PitchTracker pitch_tracker;

}


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