/*

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

*/

#include "AudioIn.h"

#include "AmplitudeAnalyzer.h"

AmplitudeAnalyzer::AmplitudeAnalyzer() :

_bitsPerSample(-1),

_available(0),

_analysis(0)

{

}

AmplitudeAnalyzer::~AmplitudeAnalyzer()

{

}

int AmplitudeAnalyzer::available()

{

return _available;

}

int AmplitudeAnalyzer::read()

{

if (_available) {

_available = 0;

return _analysis;

}

return 0;

}

int AmplitudeAnalyzer::configure(AudioIn* input)

{

int bitsPerSample = input->bitsPerSample();

if (bitsPerSample != 16 && bitsPerSample != 32) {

return 0;

}

_bitsPerSample = bitsPerSample;

return 1;

}

void AmplitudeAnalyzer::update(const void* buffer, size_t size)

{

int analysis = 0;

if (_bitsPerSample == 16) {

arm_rms_q15((q15_t*)buffer, size / 2, (q15_t*)&analysis);

} else if (_bitsPerSample == 32) {

arm_rms_q31((q31_t*)buffer, size / 4, (q31_t*)&analysis);

}

_analysis = analysis;

_available = 1;

}