audiographer/audiographer/general/analyser.h

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/*
 * Copyright (C) 2016 Robin Gareus <robin@gareus.org>
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
#ifndef AUDIOGRAPHER_ANALYSER_H
#define AUDIOGRAPHER_ANALYSER_H
 
#include <fftw3.h>
#include "loudness_reader.h"
#include "ardour/export_analysis.h"
 
namespace AudioGrapher
{
 
class LIBAUDIOGRAPHER_API Analyser : public LoudnessReader
{
  public:
        Analyser (float sample_rate, unsigned int channels, samplecnt_t bufsize, samplecnt_t n_samples, size_t width = 800, size_t bins = 200);
        ~Analyser ();
        void process (ProcessContext<float> const & c);
        ARDOUR::ExportAnalysisPtr result (bool ptr = false);
 
        void set_duration (samplecnt_t n_samples);
 
        void set_normalization_gain (float gain) {
                _result.normalized = true;
                _result.norm_gain_factor = gain;
        }
 
        static const float fft_range_db;
 
        using Sink<float>::process;
 
        private:
        float fft_power_at_bin (const uint32_t b, const float norm) const;
 
        ARDOUR::ExportAnalysisPtr _rp;
        ARDOUR::ExportAnalysis& _result;
 
        samplecnt_t   _n_samples;
        samplecnt_t   _pos;
        samplecnt_t   _spp;
        samplecnt_t   _fpp;
 
        float*     _hann_window;
        uint32_t   _fft_data_size;
        double     _fft_freq_per_bin;
        float*     _fft_data_in;
        float*     _fft_data_out;
        float*     _fft_power;
        fftwf_plan _fft_plan;
};
 
} // namespace
 
#endif