forked from PaulStoffregen/Audio
/
analyze_fft1024.h
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/
analyze_fft1024.h
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/* 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.
*/
#ifndef analyze_fft1024_h_
#define analyze_fft1024_h_
#include "Arduino.h"
#include "AudioStream.h"
#include "arm_math.h"
// windows.c
extern "C" {
extern const int16_t AudioWindowHanning1024[];
extern const int16_t AudioWindowBartlett1024[];
extern const int16_t AudioWindowBlackman1024[];
extern const int16_t AudioWindowFlattop1024[];
extern const int16_t AudioWindowBlackmanHarris1024[];
extern const int16_t AudioWindowNuttall1024[];
extern const int16_t AudioWindowBlackmanNuttall1024[];
extern const int16_t AudioWindowWelch1024[];
extern const int16_t AudioWindowHamming1024[];
extern const int16_t AudioWindowCosine1024[];
extern const int16_t AudioWindowTukey1024[];
}
class AudioAnalyzeFFT1024 : public AudioStream
{
public:
AudioAnalyzeFFT1024() : AudioStream(1, inputQueueArray),
window(AudioWindowHanning1024), state(0), outputflag(false) {
arm_cfft_radix4_init_q15(&fft_inst, 1024, 0, 1);
}
bool available() {
if (outputflag == true) {
outputflag = false;
return true;
}
return false;
}
float read(unsigned int binNumber) {
if (binNumber > 511) return 0.0;
return (float)(output[binNumber]) * (1.0 / 16384.0);
}
float read(unsigned int binFirst, unsigned int binLast) {
if (binFirst > binLast) {
unsigned int tmp = binLast;
binLast = binFirst;
binFirst = tmp;
}
if (binFirst > 511) return 0.0;
if (binLast > 511) binLast = 511;
uint32_t sum = 0;
do {
sum += output[binFirst++];
} while (binFirst <= binLast);
return (float)sum * (1.0 / 16384.0);
}
void averageTogether(uint8_t n) {
// not implemented yet (may never be, 86 Hz output rate is ok)
}
void windowFunction(const int16_t *w) {
window = w;
}
virtual void update(void);
uint16_t output[512] __attribute__ ((aligned (4)));
private:
void init(void);
const int16_t *window;
audio_block_t *blocklist[8];
int16_t buffer[2048] __attribute__ ((aligned (4)));
//uint32_t sum[512];
//uint8_t count;
uint8_t state;
//uint8_t naverage;
volatile bool outputflag;
audio_block_t *inputQueueArray[1];
arm_cfft_radix4_instance_q15 fft_inst;
};
#endif