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decoders.py
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decoders.py
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# -*- coding: utf-8 -*-
#
# Copyright (C) 2009 Phil Sung
#
# 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/>.
# Logic for selecting which decoder to run for a given file.
# TODO: detect available decoders at startup and disable extensions if they
# can't be played.
# To use any of the command lines, append a filename as the last argument.
decoders = {
'flac': ("/usr/bin/flac", "-d", "-c", "--totally-silent"),
'mp3': ("/usr/bin/mpg123", "-s", "-q"),
'ogg': ("/usr/bin/oggdec", "-Q", "-o", "-"),
}
def get_extension(filename):
# Returns the lowercased extension of the filename (e.g. 'ogg').
# Raises ValueError if the filename is malformed.
return filename[filename.rfind('.')+1:].lower()
def has_decoder(filename):
"""
Returns True if there is a decoder available for the given filename.
"""
try:
extension = get_extension(filename)
return os.path.exists(decoders[extension][0])
except (KeyError, ValueError):
return False
return False
def get_decoder(filename):
"""
Returns a command line for decoding the given filename.
This command line can be passed to subprocess.Popen, and writes all data to
stdout.
"""
extension = get_extension(filename)
return list(decoders[extension] + (filename,))