/*
 * 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, framecnt_t bufsize, framecnt_t n_samples);
	~Analyser ();
	void process (ProcessContext<float> const & c);
	ARDOUR::ExportAnalysisPtr result ();

	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::ExportAnalysis _result;

	framecnt_t   _n_samples;
	framecnt_t   _pos;
	framecnt_t   _spp;
	framecnt_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