104 lines
3.4 KiB
C++
Executable file
104 lines
3.4 KiB
C++
Executable file
/* 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
|