Hi there!
Im looking at forum about mp3 player for flipper, but not find some.
Think that hardware is enough to play mp3 via bluetooth speaker/earphones or by usb-c to 3.5 jack output.
Yep, I know than flipper is not a player, but how you guys think about that possibility?
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I think rockbox or somesuch project has audio algorithms optimized for very low performance devices.
Might be fun project to try but would not expect much out of it. Not sure how powerful the CPU is.
First mobile phone which one can play mp3 was Siemens sl45.
It have just about 13 Mhz and 1 Kb Ram onboard…
So I think CPU and Ram of Flipper Zero enough.
But my skills in C is not 
It’s not directly comparable. Many of the low-power CPUs that can decode media can do so because they have special arithmetic accelerators for that.
There is already a wav player [FL-1873] Wav player by DrZlo13 · Pull Request #1194 · flipperdevices/flipperzero-firmware · GitHub
You can try out how well it works, and try to plug in more features like mp3 decoding.
Bluetooth speaker - apparently not soon, it needs full radio stack. USB-C to jack - probably counts as USB host, which is not supported by hardware. But, as mentioned above, possible via Flipper’s speaker.