# Copyright (c) 2004-5 Marek Hnilica. All rights reserved.
# Module used for getting time & bitrate info of mp3 files.
# Distributed under GPL version 2, or (at your option) later

import mp3new,mp3old
def halfen():
	mp3info['bitrate']=int(mp3info['bitrate']*2)
	mp3info['vbrrate']=mp3info['bitrate']
	mp3info['time']=int(mp3info['time']/2)
	
def detect_mp3(filename):
	try:
		global mp3info
		mp3info=mp3new.detect_mp3(filename)
		if mp3info==0:
			raise IOError
		elif mp3info['layer']==2:
			try:
				old=mp3old.detect_mp3(filename)
				ratio=float(old['time'])/float(mp3info['time'])
				if old==0 or ((ratio<1.1) and (ratio>0.9)):
					raise IOError
			except:
				return mp3info
			return old
			
		elif mp3info['version']==2.5:
# In this case we want to make sure that it really is 2.5 as mp3new have some
# problems and sometimes detects files as 2.5 even when they're not. If it 
# was the case, then do not return result of mp3new, but rather trust mp3old.
# Debug point could be fact, that if "if not newmp3['mpeg25']:" returns true,
# eg. track isn't mpeg25, than:
# mp3info['correct_time']=mp3info['time']/(newmp3['bitrate']/mp3info['bitrate'])
			newmp3=mp3old.detect_mp3(filename)
			if not newmp3==0:
				if not newmp3['mpeg25']:
					return newmp3
			if mp3info['vbr']:
				halfen()
		elif mp3info['vbr'] and mp3info['version']!=1:
			halfen()
	except:
		try:
			mp3info=mp3old.detect_mp3(filename)
			if mp3info==0:
				raise IOError
		except:
			return 0
	return mp3info