#include <Arduino.h>
#include <AudioTools.h>
#include "AudioTools/AudioLibs/AudioRealFFT.h"
// I2S pins
#define I2S_BCK_PIN 14 // Bit Clock (BCK)
#define I2S_LRCK_PIN 15 // Left-Right Clock (LRCK)
#define I2S_DATA_PIN 12 // Data (DOUT)
#define CHANNELS 1
#define IN_SAMPLES_PER_SECOND 96000
#define IN_BITS_PER_SAMPLE 32
//Non Format Converter Stream Version
#define OUT_SAMPLES_PER_SECOND 96000
#define OUT_BITS_PER_SAMPLE 32\
//Format Converter Stream Version
//#define OUT_SAMPLES_PER_SECOND 44100
//#define OUT_BITS_PER_SAMPLE 16
I2SStream i2sStream;
AudioInfo from(96000, 1, 32);
AudioInfo to(44100, 1, 16);
AudioRealFFT afft;
//FormatConverterStream Version
// FormatConverterStream conv(afft);
//StreamCopy copier(conv, i2sStream);
//Non Format Converter Stream Version
StreamCopy copier(afft, i2sStream);
int bin_idx = 0;
// Buffer for audio samples
void fftResult(AudioFFTBase &fft){
 float diff;
 auto result = fft.result();
 if (result.magnitude>100){
 Serial.print(result.frequency);
 Serial.print(" ");
 Serial.print(result.magnitude); 
 Serial.print(" => ");
 Serial.print(result.frequencyAsNote(diff));
 Serial.print( " diff: ");
 Serial.println(diff);
 }
}
void setup() {
 Serial.begin(115200); // Initialize Serial for Serial Plotter
 AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Warning);
 // Configure I2S using AudioTools
 auto cfg = i2sStream.defaultConfig(RX_MODE);
 cfg.bits_per_sample = IN_BITS_PER_SAMPLE; // 16-bit samples
 cfg.channels = CHANNELS; // Mono
 cfg.sample_rate = IN_SAMPLES_PER_SECOND; // Sample rate
 cfg.is_master = false; // Slave mode
 cfg.i2s_format = I2S_STD_FORMAT;
 cfg.use_apll = true;
 cfg.pin_bck = I2S_BCK_PIN;
 cfg.pin_ws = I2S_LRCK_PIN;
 cfg.pin_data_rx = I2S_DATA_PIN;
 auto tcfg = afft.defaultConfig();
 tcfg.length = 8192;
 tcfg.channels = CHANNELS;
 tcfg.sample_rate = OUT_SAMPLES_PER_SECOND;
 tcfg.bits_per_sample = OUT_BITS_PER_SAMPLE;
 tcfg.callback = &fftResult;
 afft.begin(tcfg);
 i2sStream.begin(cfg); // Start I2S
 //Format Converter Stream Version
 //conv.begin(from, to);
}
void loop() {
 copier.copy(); 
 }