/usr/share/pyshared/audioread/maddec.py is in python-audioread 0.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Copyright 2011, Adrian Sampson.
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
"""Decode MPEG audio files with MAD (via pymad)."""
import mad
class UnsupportedError(Exception):
"""The file is not readable by MAD."""
class MadAudioFile(object):
"""MPEG audio file decoder using the MAD library."""
def __init__(self, filename):
self.mf = mad.MadFile(filename)
if not self.mf.total_time(): # Indicates a failed open.
raise UnsupportedError()
def close(self):
if hasattr(self, 'mf'):
del self.mf
def read_blocks(self, block_size=4096):
"""Generates buffers containing PCM data for the audio file.
"""
while True:
out = self.mf.read(block_size)
if not out:
break
yield out
@property
def samplerate(self):
"""Sample rate in Hz."""
return self.mf.samplerate()
@property
def duration(self):
"""Length of the audio in seconds (a float)."""
return float(self.mf.total_time()) / 1000
@property
def channels(self):
"""The number of channels."""
if self.mf.mode() == mad.MODE_SINGLE_CHANNEL:
return 1
elif self.mf.mode() in (mad.MODE_DUAL_CHANNEL,
mad.MODE_JOINT_STEREO,
mad.MODE_STEREO):
return 2
else:
# Other mode?
return 2
def __del__(self):
self.close()
# Iteration.
def __iter__(self):
return self.read_blocks()
# Context manager.
def __enter__(self):
return self
def __exit__(self, exc_type, exc_val, exc_tb):
self.close()
return False
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