1 /*
2  * Copyright (C) 2016 Robin Gareus <robin@gareus.org>
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License as published by
6  * the Free Software Foundation; either version 2 of the License, or
7  * (at your option) any later version.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License along
15  * with this program; if not, write to the Free Software Foundation, Inc.,
16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
17  */
18 
19 #ifndef AUDIOGRAPHER_ANALYSER_H
20 #define AUDIOGRAPHER_ANALYSER_H
21 
22 #include <fftw3.h>
23 #include "loudness_reader.h"
24 #include "ardour/export_analysis.h"
25 
26 namespace AudioGrapher
27 {
28 
29 class LIBAUDIOGRAPHER_API Analyser : public LoudnessReader
30 {
31   public:
32 	Analyser (float sample_rate, unsigned int channels, samplecnt_t bufsize, samplecnt_t n_samples);
33 	~Analyser ();
34 	void process (ProcessContext<float> const & c);
35 	ARDOUR::ExportAnalysisPtr result (bool ptr = false);
36 
37 	void set_duration (samplecnt_t n_samples);
38 
set_normalization_gain(float gain)39 	void set_normalization_gain (float gain) {
40 		_result.normalized = true;
41 		_result.norm_gain_factor = gain;
42 	}
43 
44 	static const float fft_range_db;
45 
46 	using Sink<float>::process;
47 
48 	private:
49 	float fft_power_at_bin (const uint32_t b, const float norm) const;
50 
51 	ARDOUR::ExportAnalysisPtr _rp;
52 	ARDOUR::ExportAnalysis& _result;
53 
54 	samplecnt_t   _n_samples;
55 	samplecnt_t   _pos;
56 	samplecnt_t   _spp;
57 	samplecnt_t   _fpp;
58 
59 	float*     _hann_window;
60 	uint32_t   _fft_data_size;
61 	double     _fft_freq_per_bin;
62 	float*     _fft_data_in;
63 	float*     _fft_data_out;
64 	float*     _fft_power;
65 	fftwf_plan _fft_plan;
66 };
67 
68 } // namespace
69 
70 #endif
71