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OpenAudio_ArduinoLibrary/analyze_peak_f32.cpp

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/*
* This is a direct translation of the Teensy Audio Library Peak Analyze
* to use floating point f32. This is intended to be compatible with
* Chip Audette's floating point libraries.
* Bob Larkin 23 April 2020 - AudioAnalyze_Peak_F32
*
* Regard the Paul Stoffregen copyright and licensing:
*
* Audio Library for Teensy 3.X
* Copyright (c) 2014, Paul Stoffregen, paul@pjrc.com
*
* Development of this audio library was funded by PJRC.COM, LLC by sales of
* Teensy and Audio Adaptor boards. Please support PJRC's efforts to develop
* open source software by purchasing Teensy or other PJRC products.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice, development funding notice, and this permission
* notice shall be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "AudioStream_F32.h"
#include "analyze_peak_f32.h"
void AudioAnalyzePeak_F32::update(void) {
audio_block_f32_t *blockIn;
const float32_t *p, *end;
float32_t min, max, d;
blockIn = AudioStream_F32::receiveReadOnly_f32();
if (!blockIn) {
if(errorPrint) Serial.println("AN_PEAK ERR: No input memory");
return;
}
// Variable just_read allows both read() and readPeakToPeak() to be used
if(just_read) {
// Start new collection of min_sample and max_sample
min_sample = blockIn->data[0];
max_sample = blockIn->data[0];
}
p = blockIn->data;
end = p + block_size;
min = min_sample;
max = max_sample;
do {
d=*p++;
if (d<min) min=d;
if (d>max) max=d;
} while (p < end);
min_sample = min;
max_sample = max;
new_output = true; // Tell available() that data is available
AudioStream_F32::release(blockIn);
}
float AudioAnalyzePeak_F32::read(void) {
// Tell update to start new
just_read = true;
__disable_irq();
float32_t min = min_sample;
float32_t max = max_sample;
__enable_irq();
min = abs(min);
max = abs(max);
if (min > max) max = min;
return max;
}
float AudioAnalyzePeak_F32:: readPeakToPeak(void) {
just_read = true;
__disable_irq();
float32_t min = min_sample;
float32_t max = max_sample;
__enable_irq();
return (max - min);
}