Change song title according to lyric lines (for system-wide lyric display / “Automotive Bluetooth Lyric" mode)

[hallo1]

Some android music player software support something called “Automotive Bluetooth Lyric" mode.

This mode is implemented because there is actually no way to properly transmit lyric data over bluetooth, so they just change the song title to the current lyric line for every line, as well as changing original <artist name> into <song name> - <artist name> so the title is preserved too.

(Or changeing artist name dynamically while preserving title, for a generally more compact view.)

This method works not only on automotive devices, but also many other cases, allowing user to view the lyric in any place originally for displaying title, such as smart watch/band, notification bar or bluetooth speakers...