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