LrcParser

Reads LRC synced lyrics (.lrc), the form music players and lyrics services share (#443).

Each line carries one or more time stamps, [mm:ss.xx], before its text, and shows from its time until the next line's. What real files hold, and what this reads:

• Hundredths, thousandths, tenths or no fraction at all, and a colon for the full stop.

• Several time stamps on one line, which repeat the line at each of them, as a chorus does.

• The [offset:] tag, in milliseconds, where a positive value shows every line sooner, as the format's own description and FFmpeg read it.

• The other tags, [ar:], [ti:], [al:], [by:] and the rest, which are not lyrics and draw nothing.

• The enhanced form's word stamps, <mm:ss.xx>, which are dropped, so each line shows whole.

• A line with a stamp and no text, which ends the line before it and draws nothing.

• Lines out of order, and Windows, Unix or old Mac line ends, mixed.

The last line runs to [length:] when the file gives one past its start, and otherwise for LAST_LINE_MICROS.