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FFTAnalyzer.h
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FFTAnalyzer.h
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/*
Copyright (c) 2016 Arduino LLC. All right reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _FFT_ANALYZER_H_INCLUDED
#define _FFT_ANALYZER_H_INCLUDED
#include <Arduino.h>
#define ARM_MATH_CM0PLUS
#include <arm_math.h>
#include "AudioAnalyzer.h"
class FFTAnalyzer : public AudioAnalyzer
{
public:
FFTAnalyzer(int length);
virtual ~FFTAnalyzer();
int available();
int read(int spectrum[], int size);
protected:
virtual int configure(AudioIn* input);
virtual void update(const void* buffer, size_t size);
private:
int _length;
int _bitsPerSample;
int _channels;
arm_rfft_instance_q15 _S15;
arm_rfft_instance_q31 _S31;
int _available;
void* _sampleBuffer;
int _sampleBufferSize;
void* _fftBuffer;
void* _spectrumBuffer;
};
#endif