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"""
This module is a parser for audio CDs based on discid.
It is compatible with both python-discid and python-libdiscid.
"""
try: # allow both python-discid and python-libdiscid
from libdiscid.compat import discid
except ImportError:
import discid
from xl.trax import Track
def read_disc_id(device):
"""
I/O operation to read an ID from the disc.
This must happen async because it may take quite some time.
@param device: Name of the CD device
@return: The disc ID as understood by musicbrainz and parse_disc()
"""
try: # retry with reduced features if it fails
# Note: reading additional features like isrc will take some time.
disc_id = discid.read(device, features=discid.FEATURES)
except discid.DiscError:
disc_id = discid.read(device)
return disc_id
def parse_disc(disc_id, device):
"""
Parses the given disc ID into tracks.
As a result, the data will only contain track numbers and lengths but
no sophisticated metadata.
@param disc_id: The disc ID from read_disc_id()
@param device: Name of the CD device
@return: An array of xl.trax.Track with minimal information
"""
xl_tracks = []
disc_tags = dict()
# The tag name is chosen for compatibility with the cover manager!
disc_tags['musicbrainz_albumid'] = disc_id.id
disc_tags['__freedb_disc_id'] = disc_id.freedb_id
if disc_id.mcn and '0000000000000' not in disc_id.mcn:
disc_tags['__mcn'] = disc_id.mcn
for discid_track in disc_id.tracks:
track_tags = disc_tags.copy()
track_tags['tracknumber'] = '{0}/{1}'.format(
discid_track.number, len(disc_id.tracks)
)
track_tags['title'] = "Track %d" % discid_track.number
track_tags['__length'] = discid_track.seconds
if discid_track.isrc:
track_tags['isrc'] = discid_track.isrc
track_uri = "cdda://%d/#%s" % (discid_track.number, device)
track = Track(uri=track_uri, scan=False)
track.set_tags(**track_tags)
xl_tracks.append(track)
return xl_tracks
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