Edzelf/ESP32Radio-V2 is an internet radio receiver firmware for the ESP32 microcontroller. It streams audio from Shoutcast/Icecast servers and plays local MP3 files from an SD card. The system supports both hardware (VS1053) and software (Helix MP3/AAC) audio decoding, with output via I2S DAC, internal DAC, or Toslink optical. It offers a web-based interface for station selection, volume control, and configuration, as well as MQTT, IR remote, and rotary encoder inputs. The firmware is built with PlatformIO and the Arduino framework, and it is designed to be highly configurable through compile-time defines in a central `config.h` file. Architecturally, the application is monolithic, with all main logic concentrated in a single `main.cpp` file. It uses multiple FreeRTOS tasks for networking (HTTP streaming), audio decoding/output, and SD card operations, communicating via FreeRTOS queues. A custom state machine handles HTTP streaming and metadata extraction. The system abstracts display hardware (various TFT, OLED, and LCD types) through a set of driver libraries with consistent interface macros, allowing the same firmware to be compiled for different display modules with minimal code changes. Audio decoders are also abstracted via macros, enabling compile-time selection between VS1053 and Helix software decoding. The codebase is actively maintained (last commit Feb 2026), but shows some signs of technical drift: it uses the deprecated SPIFFS filesystem, has version-guarded but older I2S API calls, and relies heavily on conditional compilation which complicates testing and maintenance. The library includes several well-crafted standalone components, such as the display drivers and hardware codec driver (VS1053), which can be reused in other ESP32 audio projects. The Helix MP3 and AAC decoders are large monolithic files with global state, limiting their reusability outside this specific project context.

The LLM identified 2 files worth highlighting for reuse: