# -*- coding: utf-8 -*-
import replaygain
import os
import hashlib
import mutagen
import logging
import math
import traceback
"""
list of supported easy tags in mutagen version 1.20
['albumartistsort', 'musicbrainz_albumstatus', 'lyricist', 'releasecountry',
'date', 'performer', 'musicbrainz_albumartistid', 'composer', 'encodedby',
'tracknumber', 'musicbrainz_albumid', 'album', 'asin', 'musicbrainz_artistid',
'mood', 'copyright', 'author', 'media', 'length', 'version', 'artistsort',
'titlesort', 'discsubtitle', 'website', 'musicip_fingerprint', 'conductor',
'compilation', 'barcode', 'performer:*', 'composersort', 'musicbrainz_discid',
'musicbrainz_albumtype', 'genre', 'isrc', 'discnumber', 'musicbrainz_trmid',
'replaygain_*_gain', 'musicip_puid', 'artist', 'title', 'bpm', 'musicbrainz_trackid',
'arranger', 'albumsort', 'replaygain_*_peak', 'organization']
"""
class AirtimeMetadata:
def __init__(self):
self.airtime2mutagen = {\
"MDATA_KEY_TITLE": "title", \
"MDATA_KEY_CREATOR": "artist", \
"MDATA_KEY_SOURCE": "album", \
"MDATA_KEY_GENRE": "genre", \
"MDATA_KEY_MOOD": "mood", \
"MDATA_KEY_TRACKNUMBER": "tracknumber", \
"MDATA_KEY_BPM": "bpm", \
"MDATA_KEY_LABEL": "organization", \
"MDATA_KEY_COMPOSER": "composer", \
"MDATA_KEY_ENCODER": "encodedby", \
"MDATA_KEY_CONDUCTOR": "conductor", \
"MDATA_KEY_YEAR": "date", \
"MDATA_KEY_URL": "website", \
"MDATA_KEY_ISRC": "isrc", \
"MDATA_KEY_COPYRIGHT": "copyright", \
}
self.mutagen2airtime = {\
"title": "MDATA_KEY_TITLE", \
"artist": "MDATA_KEY_CREATOR", \
"album": "MDATA_KEY_SOURCE", \
"genre": "MDATA_KEY_GENRE", \
"mood": "MDATA_KEY_MOOD", \
"tracknumber": "MDATA_KEY_TRACKNUMBER", \
"bpm": "MDATA_KEY_BPM", \
"organization": "MDATA_KEY_LABEL", \
"composer": "MDATA_KEY_COMPOSER", \
"encodedby": "MDATA_KEY_ENCODER", \
"conductor": "MDATA_KEY_CONDUCTOR", \
"date": "MDATA_KEY_YEAR", \
"website": "MDATA_KEY_URL", \
"isrc": "MDATA_KEY_ISRC", \
"copyright": "MDATA_KEY_COPYRIGHT", \
}
self.logger = logging.getLogger()
def get_md5(self, filepath):
"""
Returns an md5 of the file located at filepath. Returns an empty string
if there was an error reading the file.
"""
try:
f = open(filepath, 'rb')
m = hashlib.md5()
m.update(f.read())
md5 = m.hexdigest()
except Exception, e:
return ""
return md5
## mutagen_length is in seconds with the format (d+).dd
## return format hh:mm:ss.uuu
def format_length(self, mutagen_length):
t = float(mutagen_length)
h = int(math.floor(t / 3600))
t = t % 3600
m = int(math.floor(t / 60))
s = t % 60
# will be ss.uuu
s = str(s)
seconds = s.split(".")
s = seconds[0]
# have a maximum of 6 subseconds.
if len(seconds[1]) >= 6:
ss = seconds[1][0:6]
else:
ss = seconds[1][0:]
length = "%s:%s:%s.%s" % (h, m, s, ss)
return length
def save_md_to_file(self, m):
try:
airtime_file = mutagen.File(m['MDATA_KEY_FILEPATH'], easy=True)
for key in m:
if key in self.airtime2mutagen:
value = m[key]
if value is not None:
value = unicode(value)
else:
value = unicode('');
#if len(value) > 0:
self.logger.debug("Saving key '%s' with value '%s' to file", key, value)
airtime_file[self.airtime2mutagen[key]] = value
airtime_file.save()
except Exception, e:
self.logger.error('Trying to save md')
self.logger.error('Exception: %s', e)
self.logger.error('Filepath %s', m['MDATA_KEY_FILEPATH'])
def truncate_to_length(self, item, length):
if isinstance(item, int):
item = str(item)
if isinstance(item, basestring):
if len(item) > length:
return item[0:length]
else:
return item
def get_md_from_file(self, filepath):
"""
Returns None if error retrieving metadata. Otherwise returns a dictionary
representing the file's metadata
"""
self.logger.info("getting info from filepath %s", filepath)
md = {}
replay_gain_val = replaygain.calculate_replay_gain(filepath)
self.logger.info('ReplayGain calculated as %s for %s' % (replay_gain_val, filepath))
md['MDATA_KEY_REPLAYGAIN'] = replay_gain_val
try:
md5 = self.get_md5(filepath)
md['MDATA_KEY_MD5'] = md5
file_info = mutagen.File(filepath, easy=True)
except Exception, e:
self.logger.error("failed getting metadata from %s", filepath)
self.logger.error("Exception %s", e)
return None
#check if file has any metadata
if file_info is None:
return None
for key in file_info.keys() :
if key in self.mutagen2airtime:
val = file_info[key]
try:
if val is not None and len(val) > 0 and val[0] is not None and len(val[0]) > 0:
md[self.mutagen2airtime[key]] = val[0]
except Exception, e:
self.logger.error('Exception: %s', e)
self.logger.error("traceback: %s", traceback.format_exc())
if 'MDATA_KEY_TITLE' not in md:
#get rid of file extension from original name, name might have more than 1 '.' in it.
original_name = os.path.basename(filepath)
original_name = original_name.split(".")[0:-1]
original_name = ''.join(original_name)
md['MDATA_KEY_TITLE'] = original_name
#incase track number is in format u'4/11'
#need to also check that the tracknumber is even a tracknumber (cc-2582)
if 'MDATA_KEY_TRACKNUMBER' in md:
try:
md['MDATA_KEY_TRACKNUMBER'] = int(md['MDATA_KEY_TRACKNUMBER'])
except Exception, e:
pass
if isinstance(md['MDATA_KEY_TRACKNUMBER'], basestring):
try:
md['MDATA_KEY_TRACKNUMBER'] = int(md['MDATA_KEY_TRACKNUMBER'].split("/")[0], 10)
except Exception, e:
del md['MDATA_KEY_TRACKNUMBER']
#make sure bpm is valid, need to check more types of formats for this tag to assure correct parsing.
if 'MDATA_KEY_BPM' in md:
if isinstance(md['MDATA_KEY_BPM'], basestring):
try:
md['MDATA_KEY_BPM'] = int(md['MDATA_KEY_BPM'])
except Exception, e:
del md['MDATA_KEY_BPM']
#following metadata is truncated if needed to fit db requirements.
if 'MDATA_KEY_GENRE' in md:
md['MDATA_KEY_GENRE'] = self.truncate_to_length(md['MDATA_KEY_GENRE'], 64)
if 'MDATA_KEY_TITLE' in md:
md['MDATA_KEY_TITLE'] = self.truncate_to_length(md['MDATA_KEY_TITLE'], 512)
if 'MDATA_KEY_CREATOR' in md:
md['MDATA_KEY_CREATOR'] = self.truncate_to_length(md['MDATA_KEY_CREATOR'], 512)
if 'MDATA_KEY_SOURCE' in md:
md['MDATA_KEY_SOURCE'] = self.truncate_to_length(md['MDATA_KEY_SOURCE'], 512)
if 'MDATA_KEY_MOOD' in md:
md['MDATA_KEY_MOOD'] = self.truncate_to_length(md['MDATA_KEY_MOOD'], 64)
if 'MDATA_KEY_LABEL' in md:
md['MDATA_KEY_LABEL'] = self.truncate_to_length(md['MDATA_KEY_LABEL'], 512)
if 'MDATA_KEY_COMPOSER' in md:
md['MDATA_KEY_COMPOSER'] = self.truncate_to_length(md['MDATA_KEY_COMPOSER'], 512)
if 'MDATA_KEY_ENCODER' in md:
md['MDATA_KEY_ENCODER'] = self.truncate_to_length(md['MDATA_KEY_ENCODER'], 255)
if 'MDATA_KEY_CONDUCTOR' in md:
md['MDATA_KEY_CONDUCTOR'] = self.truncate_to_length(md['MDATA_KEY_CONDUCTOR'], 512)
if 'MDATA_KEY_YEAR' in md:
md['MDATA_KEY_YEAR'] = self.truncate_to_length(md['MDATA_KEY_YEAR'], 16)
if 'MDATA_KEY_URL' in md:
md['MDATA_KEY_URL'] = self.truncate_to_length(md['MDATA_KEY_URL'], 512)
if 'MDATA_KEY_ISRC' in md:
md['MDATA_KEY_ISRC'] = self.truncate_to_length(md['MDATA_KEY_ISRC'], 512)
if 'MDATA_KEY_COPYRIGHT' in md:
md['MDATA_KEY_COPYRIGHT'] = self.truncate_to_length(md['MDATA_KEY_COPYRIGHT'], 512)
#end of db truncation checks.
try:
md['MDATA_KEY_BITRATE'] = getattr(file_info.info, "bitrate", 0)
md['MDATA_KEY_SAMPLERATE'] = getattr(file_info.info, "sample_rate", 0)
md['MDATA_KEY_DURATION'] = self.format_length(getattr(file_info.info, "length", 0.0))
md['MDATA_KEY_MIME'] = ""
if len(file_info.mime) > 0:
md['MDATA_KEY_MIME'] = file_info.mime[0]
except Exception as e:
self.logger.warn(e)
if "mp3" in md['MDATA_KEY_MIME']:
md['MDATA_KEY_FTYPE'] = "audioclip"
elif "vorbis" in md['MDATA_KEY_MIME']:
md['MDATA_KEY_FTYPE'] = "audioclip"
else:
self.logger.error("File %s of mime type %s does not appear to be a valid vorbis or mp3 file." % (filepath, md['MDATA_KEY_MIME']))
return None
return md