Issues while running both AnalogAudioStream and I2SStream

[soham2560]

Brief

I am currently trying to

• use INMP441 with I2SStream to stream audio to a server through Websockets
• receive audio as a response from the server through a GET request that is copied to AnalogAudioStream PAM8304.

I have been able to successfully run both individually, but am facing issues while setting up both in the same code. (Note: Both streams won't be running at the same time, but one after the other.)

System Details

• platformio.ini config

  platform = espressif32
  board = lolin_d32
  framework = arduino
  board_build.partitions = no_ota.csv
  build_flags = -DCORE_DEBUG_LEVEL=3
  lib_deps =
  links2004/WebSockets@^2.4.1
  lennarthennigs/Button2@^2.3.2
  https://github.com/pschatzmann/arduino-libhelix.git
  https://github.com/pschatzmann/arduino-audio-tools.git

• using platformio v3.3.3 plugin with VSCode

Microphone Config

• Declarations

  AudioInfo inmp_config(44100, 2, 32);
  AudioInfo socket_config(16000, 1, 16);
  ConverterScaler<int16_t> volumeScaler(1, 0, 32767, 1);
  I2SStream inmp; 
  FormatConverterStream conv(inmp);
  const int BUFFER_SIZE = 1024;

• Definitions

  auto config = inmp.defaultConfig(RX_MODE);
  config.i2s_format = I2S_STD_FORMAT;
  config.copyFrom(inmp_config);
  config.is_master = true;
  inmp.begin(config);
  conv.begin(inmp_config, socket_config);
  volumeScaler.setFactor(20.0); // Set initial volume to 50%

• RTOS Task

  void micTask(void *parameter) {
    xSemaphoreTake(micSemaphore, portMAX_DELAY);
    uint8_t audioData[BUFFER_SIZE];
    size_t bytesRead;
    
    while (1) {
      // Read data from I2S
      uint8_t audioData[BUFFER_SIZE];
      size_t bytesRead = conv.readBytes(audioData, BUFFER_SIZE);
      
      if (bytesRead > 0) {
        volumeScaler.convert(audioData, bytesRead); // bytesRead is in bytes, we need to divide by 2 for 16-bit data
        // Send the audio data to the WebSocket server
        webSocket.sendBIN(audioData, bytesRead);
      }
      vTaskDelay(1 / portTICK_PERIOD_MS); // Delay to yield to other tasks
    }
  }

Speaker Config

• Declarations

  AnalogAudioStream audioOutput;
  EncodedAudioStream decoder(&audioOutput, new MP3DecoderHelix()); 
  StreamCopy copier(decoder, client);

• Definitions

  auto cfg = audioOutput.defaultConfig(TX_MODE);
  audioOutput.begin(cfg); 
  decoder.begin();

• RTOS Task

  void speakerTask(void *parameter) {
    xSemaphoreTake(speakerSemaphore, portMAX_DELAY);
    
    // Start HTTP request
    Url url(serverAddress);
    if (!http.processBegin(GET, url, nullptr, -1)) {
      Serial.println("GET request failed");
      // Handle error
      delay(1000); // Wait before retrying
    }
    
    while (1) {
      copier.copy();
      vTaskDelay(1 / portTICK_PERIOD_MS); // Delay to yield to other tasks
    }
  }

Note: At all points Microphone config is declared/defined before Speaker

Some Info

• When I run the code as is

  Connected IP address : 192.168.0.115
  Connecting to WiFi...
  Connected to WiFi
  E (1764) I2S: register I2S object to platform failed
  [E] AnalogAudioESP32.h : 79 - begin - i2s_driver_install
  WebSocket connected
  E (3400) I2S: i2s_write(2129): TX mode is not enabled
  [E] AnalogAudioESP32.h : 292 - size_t audio_tools::AnalogDriverESP32::outputStereo(const void*, size_t): 4608
  E (3419) I2S: i2s_write(2129): TX mode is not enabled
  [E] AnalogAudioESP32.h : 292 - size_t audio_tools::AnalogDriverESP32::outputStereo(const void*, size_t): 4608
  E (3437) I2S: i2s_write(2129): TX mode is not enabled

[pschatzmann]

The internal DAC is using the I2S port 0, so you can't use it for a second I2S !
Or in other words: you forgot to specify the port in your Micorphone config with: config.port = 1;