/*
* Calculate the crucial pieces of information for an MP3 file.
*
* Note: This method returns the duration of the MP3 in milliseconds, so
* you'll need to divide the duration by 1000 before passing it to
* MusicBrainz::TRM methods.
*
* Aliases:
* MusicBrainz::Client#get_mp3_info
*
* Examples:
* # get the duration and stereo of an MP3 named 'foo.mp3'
* info = mb.mp3_info 'foo.mp3'
* puts 'duration (ms): ' << info['duration'] << ', ' <<
* 'stereo: ' << (info['stereo'] ? 'yes' : 'no')
*
*/
static VALUE mb_client_mp3_info(VALUE self, VALUE path) {