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/* 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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} |
@ -0,0 +1,122 @@ |
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/* analyze_fft1024_F32.h Converted from Teensy I16 Audio Library
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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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/* Moved directly I16 to F32. Bob Larkin 16 Feb 2021
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* Only Hann window for now. |
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*/ |
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#ifndef analyze_fft1024_F32_h_ |
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#define analyze_fft1024_F32_h_ |
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#include "Arduino.h" |
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#include "AudioStream_F32.h" |
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#include "arm_math.h" |
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#define FFT_RMS 0 |
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#define FFT_POWER 1 |
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#define FFT_DBFS 2 |
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/* // windows.c
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extern "C" { |
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extern const int16_t AudioWindowHanning1024[]; |
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extern const int16_t AudioWindowBartlett1024[]; |
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extern const int16_t AudioWindowBlackman1024[]; |
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extern const int16_t AudioWindowFlattop1024[]; |
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extern const int16_t AudioWindowBlackmanHarris1024[]; |
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extern const int16_t AudioWindowNuttall1024[]; |
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extern const int16_t AudioWindowBlackmanNuttall1024[]; |
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extern const int16_t AudioWindowWelch1024[]; |
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extern const int16_t AudioWindowHamming1024[]; |
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extern const int16_t AudioWindowCosine1024[]; |
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extern const int16_t AudioWindowTukey1024[]; ) |
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*/ |
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class AudioAnalyzeFFT1024_F32 : public AudioStream_F32 { |
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//GUI: inputs:1, outputs:0 //this line used for automatic generation of GUI node
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//GUI: shortName:AnalyzeFFT1024
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public: |
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AudioAnalyzeFFT1024_F32() : AudioStream_F32(1, inputQueueArray) { |
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arm_cfft_radix4_init_f32(&fft_inst, 1024, 0, 1); |
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useHanningWindow(); // Revisit this for more flexibility <<<<<
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} |
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bool available() { |
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if (outputflag == true) { |
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outputflag = false; |
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return true; |
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} |
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return false; |
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} |
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float read(unsigned int binNumber) { |
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if (binNumber>511 || binNumber<0) return 0.0; |
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return output[binNumber]; |
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} |
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float read(unsigned int binFirst, unsigned int binLast) { |
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if (binFirst > binLast) { |
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unsigned int tmp = binLast; |
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binLast = binFirst; |
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binFirst = tmp; |
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} |
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if (binFirst > 511) return 0.0; |
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if (binLast > 511) binLast = 511; |
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uint32_t sum = 0; |
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do { |
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sum += output[binFirst++]; |
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} while (binFirst <= binLast); |
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return (float)sum * (1.0 / 16384.0); |
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} |
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void useHanningWindow(void) { |
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for (int i=0; i < 1024; i++) { |
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// 2*PI/1023 = 0.006141921
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window[i] = 0.5*(1.0 - cosf(0.006141921f*(float)i)); |
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} |
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} |
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// void windowFunction(const float *w) {
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// window = w;
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// }
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void setOutputType(int _type) { |
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outputType = _type; |
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} |
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virtual void update(void); |
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float output[512]; |
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private: |
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// void init(void);
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float window[1024]; int doPrint = 0; |
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audio_block_f32_t *blocklist[8]; |
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float fft_buffer[2048]; |
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uint8_t state = 0; |
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bool outputflag = false; |
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audio_block_f32_t *inputQueueArray[1]; |
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arm_cfft_radix4_instance_f32 fft_inst; |
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int outputType = FFT_RMS; //Same type as I16 version has
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}; |
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#endif |
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