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# -*- coding: utf-8 -*-
#
# Copyright (C) 2009, 2010 Amit Saha
#
# This file is part of Zeya.
#
# Zeya is free software: you can redistribute it and/or modify it under the
# terms of the GNU Affero General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option) any
# later version.
#
# Zeya is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
# details.
#
# You should have received a copy of the GNU Affero General Public License
# along with Zeya. If not, see <http://www.gnu.org/licenses/>.
# m3u backend
import os.path
import sys
from backends import LibraryBackend
from backends import extract_metadata
class M3uPlaylist(object):
def __init__(self, filename, file_obj):
"""
Parses data from FILE_OBJ (a file-like object), which contains a
playlist in M3U format.
"""
self._filename = filename
self._filenames = []
for line in file_obj:
if not line.startswith('#'):
rel_path = line.rstrip('\r\n')
abs_path = os.path.normpath(os.path.join(
os.getcwd(), os.path.dirname(filename), rel_path))
self._filenames.append(abs_path)
def get_title(self):
"""
Returns the title of this playlist.
"""
# M3U doesn't provide for specifying the title. Just use the basename
# of the file as the title of the playlist.
return os.path.basename(self._filename).decode('UTF-8')
def get_filenames(self):
"""
Returns the sequence of filenames represented by the playlist.
"""
return self._filenames
class M3uBackend(LibraryBackend):
def __init__(self, file_path=None):
self.m3u_file = file_path
# Check if the file exists so that we can fail-fast if necessary.
if not os.path.exists(self.m3u_file):
print "Error: no m3u file was found at %r." % (self.m3u_file,)
print "Please check the m3u file location, or try --backend=dir instead."
sys.exit(1)
def get_library_contents(self):
# Sequence of dicts containing the metadata for all the songs.
library = []
# Dict mapping keys to the original filenames.
self.file_list = {}
next_index = 0
try:
playlist = M3uPlaylist(self.m3u_file, open(self.m3u_file))
for filename in playlist.get_filenames():
try:
metadata = extract_metadata(os.path.abspath(filename))
except ValueError:
continue
metadata['key'] = next_index
self.file_list[next_index] = filename
library.append(metadata)
next_index = next_index + 1
return library
except IOError:
print "Error: could not read the specified playlist (%r)" \
% (self.m3u_file,)
sys.exit(1)
def get_filename_from_key(self, key):
return self.file_list[int(key)]
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