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squeezelite-esp32
ESP32 Music streaming based on Squeezelite, with support for multi-room sync, AirPlay, Bluetooth, Hardware buttons, display and more
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In theory yes, but it is more of a 'whole summer project' than 'one evening project'. There are small ESP32 Wi-Fi modules that could be connected to small I2S headphones amplifier. Both should fit inside bigger cups like DT770 has if you remove acoustic padding. You also would have to build custom dock for mixing audio inputs, converting them to digital and pushing data through Wi-FI, possibly also ESP32 based with external ADCs. The hardest part will be writing custom code to glue it all together. There are some ESP32 Wi-Fi streaming libs like: https://github.com/sle118/squeezelite-esp32 This would be a good starting point, but the amount of customisation to achieve what you described will be non-trivial. Battery life of headphones would not be stellar either, ESP modules are more suited to be used in smart home appliances powered from the grid. I'd guess about 3 hours with 750mAh battery while streaming over Wi-Fi.