Not able to compile I2S to use I2S_ADC

[ahentati]

First of all, great work Phil. It's simply amazing what you did. I'm trying to build with an ESP32 and a MAX4466 a setup that streams the voice to a web server (or using a web socket). When using I2S, it is complaining about a "class audio_tools::I2SConfigESP32V1' has no member named 'input_type'"

I'm using stream-max4466-websocket from the repo, and it seems that some libraries were moved away:

#include <Arduino.h>
#include <AudioTools.h>
#include <WiFi.h>
#include <WebSocketsServer.h>

// WiFi credentials
const char *ssid = "DESK";
const char *password = "9y293E1a";

// WebSocket server on port 81
WebSocketsServer webSocket = WebSocketsServer(81);

// Audio configuration
const int sampleRate = 16000;  // Sample rate for audio
const int bitsPerSample = 12;  // 12-bit ADC resolution on the ESP32

// Audio input stream
I2SStream i2sStream;

void onWebSocketEvent(uint8_t client_num, WStype_t type, uint8_t *payload, size_t length) {
    switch (type) {
        case WStype_DISCONNECTED:
            Serial.printf("Client [%u] disconnected\n", client_num);
            break;
        case WStype_CONNECTED:
            Serial.printf("Client [%u] connected\n", client_num);
            webSocket.sendTXT(client_num, "Welcome to the ESP32 audio stream!");
            break;
        case WStype_TEXT:
            Serial.printf("Client [%u] sent text: %s\n", client_num, payload);
            break;
        default:
            break;
    }
}

void setup() {
    Serial.begin(115200);

    // Connect to WiFi
    Serial.printf("Connecting to %s\n", ssid);
    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED) {
        delay(1000);
        Serial.print(".");
    }
    Serial.println("\nWiFi connected");
    Serial.print("IP Address: ");
    Serial.println(WiFi.localIP());

    // Set up WebSocket server
    webSocket.begin();
    webSocket.onEvent(onWebSocketEvent);

// setup i2s
  // you could define e.g your pins and change other settings
  //config.pin_ws = 10;
  //config.pin_bck = 11;
  //config.pin_data = 12;
  //config.mode = I2S_STD_FORMAT;


    // Configure the I2S input stream for DMA with ADC
    auto config = i2sStream.defaultConfig(RX_MODE);
    config.sample_rate = sampleRate;
    config.bits_per_sample = bitsPerSample;
    
    //config.use_adc = true;           // Enable ADC input mode for the I2S
    config.input_type = I2S_ADC
    
    config.adc_unit = ADC_UNIT_1;    // Set ADC unit to 1
  //  config.adc_channel = ADC1_CHANNEL_0; 
    
    i2sStream.begin(config);

    Serial.println("I2S microphone setup complete");
}

void loop() {
    webSocket.loop();   // Handle WebSocket connections

    // Check if there are any clients connected
    if (webSocket.connectedClients() > 0) {
        // Buffer to store audio data
        uint8_t audioBuffer[256];
        
        // Read audio data into the buffer
        int bytesRead = i2sStream.read(audioBuffer, sizeof(audioBuffer));
        
        // If data was read, send it to WebSocket clients
        if (bytesRead > 0) {
            for (int i = 0; i < webSocket.connectedClients(); i++) {
                webSocket.sendBIN(i, audioBuffer, bytesRead);
            }
        }
    }
}

Here is the error I'm getting.

Users/ahentati/Documents/Arduino/libraries/arduino-audio-tools/examples/examples-communication/http-server/stream-max4466-websocket/stream-max4466-websocket/stream-max4466-websocket.ino: In function 'void setup()':
/Users/ahentati/Documents/Arduino/libraries/arduino-audio-tools/examples/examples-communication/http-server/stream-max4466-websocket/stream-max4466-websocket/stream-max4466-websocket.ino:69:12: error: 'class audio_tools::I2SConfigESP32V1' has no member named 'input_type'
   69 |     config.input_type = I2S_ADC
      |            ^~~~~~~~~~
/Users/ahentati/Documents/Arduino/libraries/arduino-audio-tools/examples/examples-communication/http-server/stream-max4466-websocket/stream-max4466-websocket/stream-max4466-websocket.ino:69:25: error: 'I2S_ADC' was not declared in this scope
   69 |     config.input_type = I2S_ADC
      |                         ^~~~~~~
/Users/ahentati/Documents/Arduino/libraries/arduino-audio-tools/examples/examples-communication/http-server/stream-max4466-websocket/stream-max4466-websocket/stream-max4466-websocket.ino: In function 'void loop()':
/Users/ahentati/Documents/Arduino/libraries/arduino-audio-tools/examples/examples-communication/http-server/stream-max4466-websocket/stream-max4466-websocket/stream-max4466-websocket.ino:88:39: error: no matching function for call to 'audio_tools::I2SStream::read(uint8_t [256], unsigned int)'
   88 |         int bytesRead = i2sStream.read(audioBuffer, sizeof(audioBuffer));
      |                         ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /Users/ahentati/Documents/Arduino/libraries/arduino-audio-tools/src/AudioTools/CoreAudio/AudioStreams.h:9,
                 from /Users/ahentati/Documents/Arduino/libraries/arduino-audio-tools/src/AudioTools/CoreAudio/AudioFilter/Equilizer.h:6,
                 from /Users/ahentati/Documents/Arduino/libraries/arduino-audio-tools/src/AudioTools.h:78,
                 from /Users/ahentati/Documents/Arduino/libraries/arduino-audio-tools/examples/examples-communication/http-server/stream-max4466-websocket/stream-max4466-websocket/stream-max4466-websocket.ino:2:
/Users/ahentati/Documents/Arduino/libraries/arduino-audio-tools/src/AudioTools/CoreAudio/BaseStream.h:73:15: note: candidate: 'virtual int audio_tools::BaseStream::read()'
   73 |   virtual int read() override {
      |               ^~~~
/Users/ahentati/Documents/Arduino/libraries/arduino-audio-tools/src/AudioTools/CoreAudio/BaseStream.h:73:15: note:   candidate expects 0 arguments, 2 provided

exit status 1

Compilation error: 'class audio_tools::I2SConfigESP32V1' has no member named 'input_type'

Any idea on how to fix this (and use the right libraries)?

Thank you!

[pschatzmann]

You want to use the AnalogAudioStream class for analog audio input!

[ahentati]

Thank you Phill! It doesn't seem to work with the web server on an ESP32. Any luck with the web socket? Did you add it to the AnalogAudioStream class?
Here is my code:

#include <Arduino.h>
#include <AudioTools.h>
#include <WiFi.h>

// WiFi credentials
const char *ssid = "AndroidAPbc1f";
const char *password = "lolololololol";

// AudiWavServer 
AudioWAVServer server(ssid,password); // the same a above

// Audio configuration
AudioInfo info(16000, 1, 12);

// Audio input stream
AnalogAudioStream in;

ConverterFillLeftAndRight<int16_t> filler(RightIsEmpty); // fill both channels - or change to RightIsEmpty




void setup() {
  Serial.begin(115200);
  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);

  auto config = in.defaultConfig(RX_MODE);
  // cfgRx.start_pin = A1; // optinally define pin
  // cfgRx.is_auto_center_read = true;
  config.copyFrom(info);
  in.begin(config);


// start data sink
  server.begin(in, config, &filler);



}

void loop() {
 // Handle new connections
  server.copy();  
}

[pschatzmann]

https://github.com/pschatzmann/arduino-audio-tools/wiki/It's-not-working

[pschatzmann]

This does not look right to me: You are supposed to see a sine wave!
You were writing that you are using an analog microphone, but the sketch is for a digital one
Can you share a picture of your micrphone ?

[ahentati]

And here is the SIN just in case:

/**
 * @file streams-generator-i2s.ino
 * @author Phil Schatzmann
 * @brief see https://github.com/pschatzmann/arduino-audio-tools/blob/main/examples/examples-stream/streams-generator-i2s/README.md 
 * @copyright GPLv3
 */
 
#include "AudioTools.h"

AudioInfo info(16000, 1, 16);
SineWaveGenerator<int16_t> sineWave(32000);                // subclass of SoundGenerator with max amplitude of 32000
GeneratedSoundStream<int16_t> sound(sineWave);             // Stream generated from sine wave
CsvOutput<int32_t> csvStream(Serial);
StreamCopy copier(csvStream, sound);                             // copies sound into i2s

// Arduino Setup
void setup(void) {  
  // Open Serial 
  Serial.begin(115200);
  while(!Serial);
  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);


  // Setup sine wave
  sineWave.begin(info, N_B4);
  Serial.println("started...");

  csvStream.begin(info);

}

// Arduino loop - copy sound to out 
void loop() {
  copier.copy();
}

Graph below:

[pschatzmann]

No, you are supposed to record a sine wave via the microphone and display it on the Serial Plotter.
If everything works right, you see a sine wave that is zero centered. If not you do something wrong...

[ahentati]

This does not look right to me: You are supposed to see a sine wave!
You were writing that you are using an analog microphone, but the sketch is for a digital one
Can you share a picture of your micrphone ?

The sin is on the above post.

Here we go for the pic of the Mic:

[ahentati]

Can you record a sine wave and share the print screen of the Serial Plotter ?

Here is the graph when playing a sin next to the MIC:

I'm using the following code which indeed seems wrong (Digital):

/**
 * @file streams-i2s-serial.ino
 * @author Phil Schatzmann
 * @brief see https://github.com/pschatzmann/arduino-audio-tools/blob/main/examples/examples-stream/streams-i2s-serial/README.md
 * 
 * @author Phil Schatzmann
 * @copyright GPLv3
 */


#include "AudioTools.h"

AudioInfo info(16000, 1, 12);
I2SStream in; // Access I2S as stream
CsvOutput<int32_t> csvStream(Serial);
StreamCopy copier(csvStream, in); // copy AnalogAudioStream to csvStream

// Arduino Setup
void setup(void) {
    Serial.begin(115200);
    AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Debug);
    
    auto cfg = in.defaultConfig(RX_MODE);
    
    cfg.copyFrom(info);
    //cfg.i2s_format = I2S_STD_FORMAT; // or try with I2S_LSB_FORMAT
    //cfg.is_master = true;
     // this module needs a master clock if the ESP32 is master
    //cfg.use_apll = false;  // try with yes
    //cfg.pin_mck = 3; 
    cfg.pin_data = 34;
    
    in.begin(cfg);

    // make sure that we have the correct channels set up
    csvStream.begin(info);

}

// Arduino loop - copy data
void loop() {
    copier.copy();
}

When moving to AnalogAudioStream instead of I2SStream, the pin_data is not available and the following is showing on the debug console:

23:09:46.311 -> [D] StreamCopy.h : 100 - copy 1024 bytes 
23:09:46.311 -> [D] StreamCopy.h : 243 - available: 0
23:09:46.311 -> [D] StreamCopy.h : 178 - no data 

[pschatzmann]

This is definitly an analog micrphone: so don't use I2SStream!

[ahentati]

When using AnalogAudioStream I've got no data... Which PIN to use when using AnalogAudioStream Class?

[pschatzmann]

I already gave you this info 1h ago: The ADC driver API supports ADC1 (8 channels, attached to GPIOs 32 - 39)
You can configure the channels.

[ahentati]

Oops! I missed it sorry! I've modified my code as follow:

/**
 * @file streams-i2s-serial.ino
 * @author Phil Schatzmann
 * @brief see https://github.com/pschatzmann/arduino-audio-tools/blob/main/examples/examples-stream/streams-i2s-serial/README.md
 * 
 * @author Phil Schatzmann
 * @copyright GPLv3
 */


#include "AudioTools.h"

AudioInfo info(16000, 1, 12);
AnalogAudioStream in; // Access I2S as stream
CsvOutput<int32_t> csvStream(Serial);
StreamCopy copier(csvStream, in); // copy AnalogAudioStream to csvStream

// Arduino Setup
void setup(void) {
    Serial.begin(115200);
    AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);
    
    auto cfg = in.defaultConfig(RX_MODE);
    
    cfg.copyFrom(info);
     // For ESP32 by Espressif Systems version 3.0.0 and later:
  // see examples/README_ESP32.md
     cfg.sample_rate = 16000;
     cfg.adc_bit_width = 12;
  // cfg.adc_calibration_active = true;
  // cfg.is_auto_center_read = false;
  // cfg.adc_attenuation = ADC_ATTEN_DB_12; 
     cfg.channels = 1;
     cfg.adc_channels[0] = ADC_CHANNEL_5; 
  // cfg.adc_channels[1] = ADC_CHANNEL_5;
 
    in.begin(cfg);

    // make sure that we have the correct channels set up
    csvStream.begin(info);

}

// Arduino loop - copy data
void loop() {
    copier.copy();
}

So I've connected my MIC to GPIO33 (Channel 5)... Still same output:

23:35:33.219 -> [D] StreamCopy.h : 178 - no data 
23:35:33.219 -> [D] StreamCopy.h : 100 - copy 1024 bytes 
23:35:33.219 -> [D] StreamCopy.h : 243 - available: 0

[pschatzmann]

Still plentiy of errors in your sketch:

• It must be AudioInfo info(16000, 1, 16);
• and CsvOutput<int16_t> csvStream(Serial);
• Remove the cfg.channels = 1; this is already defined via the info

And look at the error messages in your log

[ahentati]

I've configured it 12 since I think the max on ESP32 is 12 bit per sample. I've fixed CSV to int16 and removed cfg.channels =1. Still the same log :(. Available 0, GPIO33 is not getting anything I guess... Any clue?

[pschatzmann]

Look at the error log: you must be missing some error messages!
Don't use log level debug: you will risk to miss the important errors...
Also activate the ESP32 Core Debug in the Tools menu
What ESP32 version do you have ?

[ahentati]

Look at the error log: you must be missing some error messages! Don't use log level debug: you will risk to miss the important errors... Also activate the ESP32 Core Debug in the Tools menu What ESP32 version do you have ?

No errors at all when I changed it to Info. I'm using an ESP32-WROOM-32. Even with Core Debug, there is no output on the Serial Monitor... Any other clue?

[ahentati]

I did a simple sktech to directly plot the analog output from pin 32:

void setup() {
  // put your setup code here, to run once:
pinMode(32,INPUT);
Serial.begin(115200);
}

void loop() {
  // put your main code here, to run repeatedly:
int voice=analogRead(32);
Serial.println(voice);
}

Here is the result when playing a sin:

I suspect an issue with the MIC... What do you think?

Regards,
Akram

[pschatzmann]

If you were recording a sine wave this would be not good: if not this is inconclusive.

I was just using your corrected sketch and was getting the following log:

[I] AnalogConfigESP32V1.h : 139 - I2S_MODE_ADC_BUILT_IN
[I] AnalogAudioStream.h : 66 - bool audio_tools::AnalogAudioStream::begin(audio_tools::AnalogConfig)
[I] AnalogDriverESP32V1.h : 678 - channels: 1, max: 6
[I] AnalogDriverESP32V1.h : 688 - ADC channel 5 is on pin 33
[E] AnalogDriverESP32V1.h : 699 - sample rate eff: 16000 can not be set, range: 20000 to 2000000

I think this gives the information what your problem is !

[ahentati]

Hi Phill,

Did you get this log messages using Debug on AudioToolsLogLevel? I've changed the sampling rate to the min supported on ESP32 and it worked :). I've also tried with two different analog mic and the result are weird for the max4466:

MAX4466:

MAX9814:

[ahentati]

Do I need to include any LIB to be able to use AnalogDriverESP32V1.h? I only have AudioTools.h in my includes...

[ahentati]

I'n now trying to use the web socket and use readBytes, however, I don't receive any audio. Do I need to format the flow before sending it to the web socket? Here is my sketch:

/**
 * @file streams-i2s-serial.ino
 * @author Phil Schatzmann
 * @brief see https://github.com/pschatzmann/arduino-audio-tools/blob/main/examples/examples-stream/streams-i2s-serial/README.md
 * 
 * @author Phil Schatzmann
 * @copyright GPLv3
 */


#include "AudioTools.h"
#include <WiFi.h>
#include <WebSocketsServer.h>

// WiFi credentials
const char *ssid = "TT_DFD0";
const char *password = "55492969";

// WebSocket server on port 81
WebSocketsServer webSocket = WebSocketsServer(81);


AudioInfo info(44100, 1, 16);
AnalogAudioStream in; // Access I2S as stream

void onWebSocketEvent(uint8_t client_num, WStype_t type, uint8_t *payload, size_t length) {
    switch (type) {
        case WStype_DISCONNECTED:
            Serial.printf("Client [%u] disconnected\n", client_num);
            break;
        case WStype_CONNECTED:
            Serial.printf("Client [%u] connected\n", client_num);
            webSocket.sendTXT(client_num, "Welcome to the ESP32 audio stream!");
            break;
        case WStype_TEXT:
            Serial.printf("Client [%u] sent text: %s\n", client_num, payload);
            break;
        default:
            break;
    }
}


//CsvOutput<int16_t> csvStream(Serial);
//StreamCopy copier(webSocket, in); // copy AnalogAudioStream to webSocket

// Arduino Setup
void setup(void) {
    Serial.begin(115200);
    AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Debug);

      Serial.printf("Connecting to %s\n", ssid);
    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED) {
        delay(1000);
        Serial.print(".");
    }
    Serial.println("\nWiFi connected");
    Serial.print("IP Address: ");
    Serial.println(WiFi.localIP());

    // Set up WebSocket server
    webSocket.begin();
    webSocket.onEvent(onWebSocketEvent);


    auto cfg = in.defaultConfig(RX_MODE);
    
    cfg.copyFrom(info);
     // For ESP32 by Espressif Systems version 3.0.0 and later:
  // see examples/README_ESP32.md
  // cfg.sample_rate = 16000;
  //cfg.adc_bit_width = 16;
  // cfg.adc_calibration_active = true;
  // cfg.is_auto_center_read = false;
  // cfg.adc_attenuation = ADC_ATTEN_DB_12; 
  //  cfg.channels = 1;
     cfg.adc_channels[0] = ADC_CHANNEL_5; //GPIO33
  // cfg.adc_channels[1] = ADC_CHANNEL_5;
 
    in.begin(cfg);

    // make sure that we have the correct channels set up
    //csvStream.begin(info);

}

// Arduino loop - copy data
void loop() {
    webSocket.loop();   // Handle WebSocket connections

    // Check if there are any clients connected
    if (webSocket.connectedClients() > 0) {
        // Buffer to store audio data
        uint8_t audioBuffer[256];
        
        // Read audio data into the buffer
        int bytesRead = in.readBytes(audioBuffer, sizeof(audioBuffer));
        
        // If data was read, send it to WebSocket clients
        if (bytesRead > 0) {
            for (int i = 0; i < webSocket.connectedClients(); i++) {
                webSocket.sendBIN(i, audioBuffer, bytesRead);
            }
        }
    }
}

[pschatzmann]

Try to measure the max data rate that your websockets supports.
You might just generate too much data and the sending can't keep up...

[ahentati]

Here we go:

01:27:09.207 -> Starting through put measurement...
01:27:09.207 -> =========== After Setup Start ============
01:27:09.207 -> INTERNAL Memory Info:
01:27:09.207 -> ------------------------------------------
01:27:09.207 ->   Total Size        :   325308 B ( 317.7 KB)
01:27:09.207 ->   Free Bytes        :   282068 B ( 275.5 KB)
01:27:09.239 ->   Allocated Bytes   :    35568 B (  34.7 KB)
01:27:09.239 ->   Minimum Free Bytes:   276692 B ( 270.2 KB)
01:27:09.239 ->   Largest Free Block:   110580 B ( 108.0 KB)
01:27:09.239 -> ------------------------------------------
01:27:09.239 -> GPIO Info:
01:27:09.239 -> ------------------------------------------
01:27:09.239 ->   GPIO : BUS_TYPE[bus/unit][chan]
01:27:09.239 ->   --------------------------------------  
01:27:09.239 ->      1 : UART_TX[0]
01:27:09.239 ->      3 : UART_RX[0]
01:27:09.272 ->     36 : ADC_CONT[0][0]
01:27:09.272 -> ============ After Setup End =============
01:27:40.463 -> ==> Bytes per second: 29000
01:28:11.759 -> ==> Bytes per second: 32000
01:28:43.037 -> ==> Bytes per second: 32000
01:29:14.320 -> ==> Bytes per second: 32000

How do I know if my "buffer" size is ok or not. Here is my sketch:

/**
 * Internal ADC: It depdens pretty much on our processor & arduino version if and how
 * this is supported.
 */

#include "Arduino.h"
#include "AudioTools.h"


AudioInfo info(20000, 1, 16);

// On board analog to digital converter
AnalogAudioStream analog_in; 

// Measure throughput
MeasuringStream measure(1000, &Serial);

// Copy input to output
StreamCopy copier(measure, analog_in);

void setup() {

  delay(3000); // wait for serial to become available

  // Serial Interface
  Serial.begin(115200);
  // Include logging to serial
  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info); //Warning, Info, Error, Debug
  
  // Configure ADC input
  auto adcConfig = analog_in.defaultConfig(RX_MODE);

  adcConfig.copyFrom(info);


  // For ESP32 by Espressif Systems version 3.0.0 and later 
  // see examples/README_ESP32.md
  // adcConfig.sample_rate = 22050;
  // adcConfig.adc_bit_width = 12;
  // adcConfig.adc_calibration_active = true;
  // adcConfig.is_auto_center_read = false;
  // adcConfig.adc_attenuation = ADC_ATTEN_DB_12; 
  // adcConfig.channels = 2;
  // adcConfig.adc_channels[0] = ADC_CHANNEL_4; 
  // adcConfig.adc_channels[1] = ADC_CHANNEL_5;

  //adcConfig.sample_rate = 44100; // per channel

  Serial.println("Starting ADC...");
  analog_in.begin(adcConfig);

  // Start Measurements
  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Warning); //Warning, Debug, Info, Error
  Serial.println("Starting through put measurement...");
}

void loop() {
  copier.copy(); 
}

And here is the web socket sketch:

/**
 * @file streams-i2s-serial.ino
 * @author Phil Schatzmann
 * @brief see https://github.com/pschatzmann/arduino-audio-tools/blob/main/examples/examples-stream/streams-i2s-serial/README.md
 * 
 * @author Phil Schatzmann
 * @copyright GPLv3
 */


#include "AudioTools.h"
#include <WiFi.h>
#include <WebSocketsServer.h>

// WiFi credentials
const char *ssid = "AndroidAPbc1f";
const char *password = "123456788";

// WebSocket server on port 81
WebSocketsServer webSocket = WebSocketsServer(81);


AudioInfo info(20000, 1, 16);
AnalogAudioStream in; // Access I2S as stream

void onWebSocketEvent(uint8_t client_num, WStype_t type, uint8_t *payload, size_t length) {
    switch (type) {
        case WStype_DISCONNECTED:
            Serial.printf("Client [%u] disconnected\n", client_num);
            break;
        case WStype_CONNECTED:
            Serial.printf("Client [%u] connected\n", client_num);
            webSocket.sendTXT(client_num, "Welcome to the ESP32 audio stream!");
            break;
        case WStype_TEXT:
            Serial.printf("Client [%u] sent text: %s\n", client_num, payload);
            break;
        default:
            break;
    }
}


//CsvOutput<int16_t> csvStream(Serial);
//StreamCopy copier(webSocket, in); // copy AnalogAudioStream to webSocket

// Arduino Setup
void setup(void) {
    Serial.begin(115200);
    AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Debug);

      Serial.printf("Connecting to %s\n", ssid);
    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED) {
        delay(1000);
        Serial.print(".");
    }
    Serial.println("\nWiFi connected");
    Serial.print("IP Address: ");
    Serial.println(WiFi.localIP());

    // Set up WebSocket server
    webSocket.begin();
    webSocket.onEvent(onWebSocketEvent);


    auto cfg = in.defaultConfig(RX_MODE);
    
    cfg.copyFrom(info);
     // For ESP32 by Espressif Systems version 3.0.0 and later:
  // see examples/README_ESP32.md
  // cfg.sample_rate = 16000;
  //cfg.adc_bit_width = 16;
  // cfg.adc_calibration_active = true;
  // cfg.is_auto_center_read = false;
  // cfg.adc_attenuation = ADC_ATTEN_DB_12; 
  //  cfg.channels = 1;
     cfg.adc_channels[0] = ADC_CHANNEL_5; //GPIO33
  // cfg.adc_channels[1] = ADC_CHANNEL_5;
 
    in.begin(cfg);

    // make sure that we have the correct channels set up
    //csvStream.begin(info);

}

// Arduino loop - copy data
void loop() {
    webSocket.loop();   // Handle WebSocket connections

    // Check if there are any clients connected
    if (webSocket.connectedClients() > 0) {
        // Buffer to store audio data
        uint8_t audioBuffer[1024];
        
        // Read audio data into the buffer
        int bytesRead = in.readBytes(audioBuffer, sizeof(audioBuffer));
        
        // If data was read, send it to WebSocket clients
        if (bytesRead > 0) {
            for (int i = 0; i < webSocket.connectedClients(); i++) {
                webSocket.sendBIN(i, audioBuffer, bytesRead);
            }
        }
    }
}

[pschatzmann]

I am confused: you should measure how fast you receive the data from the websocket and not how fast you receive the data from AnalogAudioStream (which is already known!)

[pschatzmann]

Did you set the log level to Warning ?
Maybe the noise from your power supply ?

[ahentati]

I'm using Info, and I'm using my usb as a power source for now...

[ahentati]

The pitch means that we are sending quicker than the source right? Could it be related to the Buffering of the Wav Server?

[pschatzmann]

If the audio is playing quicker or slower then it should be, then the recording format does not match with the playback format: with either the sample rate or number of channels not set to be identical. If the bits_per_sample is not right, you will just get noise!

[ahentati]

I'm defining the sampling rate as follow:

int bits_per_sample = 16;

However, if I understand well, the ESP32 ADC works @ 12 bits per sample max. I'm not sure how this ends up at 16 bits at the end. Could it be the source of the issue?

Regards,
Akram

[pschatzmann]

16 is correct: this defines the data type that is used to represent the data. 12 bits will be represented by int16_t numbers