/usr/share/pyshared/kaa/metadata/audio/adts.py is in python-kaa-metadata 0.7.7+svn4596-4.
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# -----------------------------------------------------------------------------
# adts.py - pcm file parser
# -----------------------------------------------------------------------------
# $Id: adts.py 3613 2008-10-10 21:31:08Z dmeyer $
#
# http://www.audiocoding.com/modules/wiki/?page=ADTS
#
# -----------------------------------------------------------------------------
# kaa-Metadata - Media Metadata for Python
# Copyright (C) 2003-2006 Thomas Schueppel, Dirk Meyer
#
# First Edition: Dirk Meyer <dischi@freevo.org>
# Maintainer: Dirk Meyer <dischi@freevo.org>
#
# Please see the file AUTHORS for a complete list of authors.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MER-
# CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
# Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# -----------------------------------------------------------------------------
__all__ = ['Parser']
import struct
# import kaa.metadata.audio core
import core
# ADTS Fixed header: these don't change from frame to frame
#
# syncword 12 always: '111111111111'
# ID 1 0: MPEG-4, 1: MPEG-2
# layer 2 always: '00'
# protection_absent 1
# profile 2
# sampling_frequency_index 4
# private_bit 1
# channel_configuration 3
# original/copy 1
# home 1
#
# ADTS Variable header: these can change from frame to frame
#
# copyright_identification_bit 1
# copyright_identification_start 1
# aac_frame_length 13 length of the frame including header (in bytes)
# adts_buffer_fullness 11 0x7FF indicates VBR
# no_raw_data_blocks_in_frame 2
#
# ADTS Error check
#
# crc_check 16 only if protection_absent == 0
#
class ADTS(core.Music):
def __init__(self,file):
core.Music.__init__(self)
if not file.name.endswith('aac'):
# we have a bad detection here, so if the filename does
# not match, we skip.
raise core.ParseError()
header = struct.unpack('>7B', file.read(7))
if header[0] != 255 or (header[1] >> 4) != 15:
raise core.ParseError()
self.mime = 'audio/aac'
Parser = ADTS
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