Does mp3 play works without external DAC on ESP32?

[Mir1001]

I got board with amplifier ICs FM8002A and ESP32. I am able to play mp3, but sound is heavy distorted (Wav and mp3 file). If I play artificially generated sound it almost works. I have tried different combinations:

Best I got listen here

AudioOutputI2S *outs(int o) //o - selected option
{
    switch (o)
    {
    case 0: // distorted almost works
        return new AudioOutputI2SNoDAC();
    case 1:
        return new AudioOutputI2S(); // loud and distorted
    case 2:                          // sample rate is too small, the mclk division exceed the maximum value 255
        return new AudioOutputI2S(0, AudioOutputI2S::INTERNAL_DAC);
    case 3: // i2s_calculate_pdm_tx_clock(720): sample rate is too small, the mclk division exceed the maximum value 255
        return new AudioOutputI2S(0, AudioOutputI2S::INTERNAL_PDM, 8, AudioOutputI2S::APLL_ENABLE);
    case 4: // loud and distorted
        return new AudioOutputI2S(0, AudioOutputI2S::EXTERNAL_I2S, 8, AudioOutputI2S::APLL_ENABLE);
    case 5:  // loud and distorted
        return new AudioOutputI2S(0, AudioOutputI2S::EXTERNAL_I2S, 8, AudioOutputI2S::APLL_DISABLE);
    default:
        return nullptr; // Handle unexpected values of 'o'
    }
};

Can someone give me any suggestion at lest confirm that it should work or that you had same problems ;(.

Thanks

[anupam-dubey]

i stuck with the same issue

#include "AudioFileSourceSPIFFS.h"
#include "AudioGeneratorMP3.h"
#include "AudioOutputI2S.h"
#include "SPIFFS.h"

AudioGeneratorMP3 *mp3;
AudioFileSourceSPIFFS *file;
// The library can be configured to use the internal DAC via I2S
AudioOutputI2S *out;

void setup() {
Serial.begin(115200);
SPIFFS.begin(true); // Start SPIFFS
Serial.println("SPIFFS mounted");

// Specify the MP3 file path
file = new AudioFileSourceSPIFFS("/pno-cs.mp3");

// Initialize AudioOutputI2S, specifying the DAC pins.
// You may need to check the library documentation for specific
// configuration to route to the internal DAC pins (GPIO 25/26) directly.
// The snippet below shows a generic setup, often configured
// via setPinout for I2S modules, but for the internal DAC, the
// library will manage the correct output.
out = new AudioOutputI2S(0, false); // Example, check library specifics for direct DAC pin usage
// out->setPins(GPIO_NONE, GPIO_NONE, GPIO_NONE); // Ensure I2S pins are not set if using internal DAC directly or configure for DAC output

mp3 = new AudioGeneratorMP3();
mp3->begin(file, out);
}

void loop() {
if (mp3->isRunning()) {
if (!mp3->loop()) {
mp3->stop();
Serial.println("MP3 playback finished");
}
} else {
// Optional: add code here to restart playback or stop
}
}

[anupam-dubey]

not provding any audio to be cascaded with amplifier