A song is an input. When you select a song to play, the MP3 file is decoded, and this data is sent to the speaker to be used as the output.
Out put
An MP3 player uses the file.mp3 (a song for example) as its input. It then decodes (decompresses) this as an MP3 file is a compressed file. The resulting decoded data is then used as it's output, usually sent to a speaker with the help of a digital to analog converter and an amplifier. A MP3 recorder would do the process in reverse and the sound would be its input and the resulting MP3 file would be it's output.
output
Because with most MP3 players you can only "output" media. As opposed to "input" meaning it can receive, such as a microphone, or a camera.
is an omr and input or output device?
both input r output
Input device.
it is an output device
output/input
output and input
Neither, it is not classified under input or output. It has its own identity
Easily? No. To do so you setup your turntable so that the speaker output goes into your computer aux input and you record it with Audicity (that's what I used when I did mine) and then convert the output from WAV to mp3. It's a slow process but worth it depending on what music you have.