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137 lines
4.5 KiB
137 lines
4.5 KiB
/* analyze_fft1024_F32.cpp Converted from Teensy I16 Audio Library
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* This version uses floating point F32 inputs
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*
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* Conversion parts copyright (c) Bob Larkin 2021
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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 <Arduino.h>
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#include "analyze_fft1024_F32.h"
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// #include "utility/dspinst.h"
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// Move audio data from an audio_block_f32_t to the FFT instance buffer.
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static void copy_to_fft_buffer(void *destination, const void *source)
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{
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const float *src = (const float *)source;
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float *dst = (float *)destination;
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for (int i=0; i < AUDIO_BLOCK_SAMPLES; i++) {
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*dst++ = *src++; // real sample
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*dst++ = 0.0f; // 0 for Imag
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}
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}
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static void apply_window_to_fft_buffer(void *buffer, const void *window)
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{
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float *buf = (float *)buffer; // 0th entry is real (do window) 1th is imag
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const float *win = (float *)window;
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for (int i=0; i < 1024; i++)
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buf[2*i] *= *win++;
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}
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void AudioAnalyzeFFT1024_F32::update(void)
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{
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audio_block_f32_t *block;
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block = receiveReadOnly_f32();
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if (!block) return;
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// What all does 7EM cover??
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#if defined(__ARM_ARCH_7EM__)
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switch (state) {
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case 0:
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blocklist[0] = block;
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state = 1;
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break;
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case 1:
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blocklist[1] = block;
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state = 2;
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break;
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case 2:
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blocklist[2] = block;
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state = 3;
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break;
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case 3:
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blocklist[3] = block;
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state = 4;
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break;
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case 4:
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blocklist[4] = block;
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state = 5;
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break;
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case 5:
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blocklist[5] = block;
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state = 6;
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break;
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case 6:
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blocklist[6] = block;
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state = 7;
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break;
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case 7:
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blocklist[7] = block;
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copy_to_fft_buffer(fft_buffer+0x000, blocklist[0]->data);
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copy_to_fft_buffer(fft_buffer+0x100, blocklist[1]->data);
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copy_to_fft_buffer(fft_buffer+0x200, blocklist[2]->data);
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copy_to_fft_buffer(fft_buffer+0x300, blocklist[3]->data);
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copy_to_fft_buffer(fft_buffer+0x400, blocklist[4]->data);
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copy_to_fft_buffer(fft_buffer+0x500, blocklist[5]->data);
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copy_to_fft_buffer(fft_buffer+0x600, blocklist[6]->data);
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copy_to_fft_buffer(fft_buffer+0x700, blocklist[7]->data);
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if (window)
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apply_window_to_fft_buffer(fft_buffer, window);
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arm_cfft_radix4_f32(&fft_inst, fft_buffer);
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for (int i=0; i < 512; i++) {
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float magsq = fft_buffer[2*i]*fft_buffer[2*i] + fft_buffer[2*i+1]*fft_buffer[2*i+1];
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if(outputType==FFT_RMS)
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output[i] = sqrtf(magsq);
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else if(outputType==FFT_POWER)
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output[i] = magsq;
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else if(outputType==FFT_DBFS)
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output[i] = 10.0f*log10f(magsq)-54.1854f; // Scaled to FS sine wave
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else
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output[i] = 0.0f;
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}
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outputflag = true;
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release(blocklist[0]);
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release(blocklist[1]);
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release(blocklist[2]);
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release(blocklist[3]);
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blocklist[0] = blocklist[4];
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blocklist[1] = blocklist[5];
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blocklist[2] = blocklist[6];
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blocklist[3] = blocklist[7];
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state = 4;
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break;
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}
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#else
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release(block);
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#endif
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}
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