Spectrogram.hxx

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/*
Copyright (c) 2012,2013,2014 Matthew H. Reilly (kb1vc)
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

    Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.
    Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in
    the documentation and/or other materials provided with the
    distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#ifndef SPECTROGRAM_HDR
#define SPECTROGRAM_HDR
#include <fstream>
#include <complex>
#include <fftw3.h>

namespace SoDa {
  class Spectrogram {
  public:
    Spectrogram(unsigned int fftlen);

    void apply_acc(std::complex<float> * invec, unsigned int inveclen,
           float * outvec, 
           float accumulation_gain = 0.0); 
    
    void apply_max(std::complex<float> * invec, unsigned int inveclen,
           float * outvec, bool first = true);

    
  private:

    float * initBlackmanHarris();

    void apply_common(std::complex<float> * invec, unsigned int inveclen);
    
    fftwf_plan fftplan;
    float * window;
    std::complex<float> * win_samp;
    std::complex<float> * fft_out; 
    float * result; 
    unsigned int fft_len; 
  }; 
}

#endif