ESP32 Forum

do any one have idea / repo for resample 16 bits depth mp3 to a 32 bits depth mp3?

Resample only works on PCM format.
To covert 16bits to 32bits PCM, if all use little endian, you need only left shift 16 bits, no need resample.
If you want to change 16bits mp3 to 32bits mp3, you need firstly decode mp3 into pcm, convert to 32 bits then re-encode to mp3.

Any way to convert the mp3 into pcm, is this kind of function include in ADF, or I need to download extra library?

you can find the sample code in:
https://github.com/espressif/esp-adf/bl ... _example.c

https://github.com/espressif/esp-adf-li ... _decoder.h