/usr/lib/pypy/dist-packages/mutagen/oggopus.py is in pypy-mutagen 1.25.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 | # -*- coding: utf-8 -*-
# Copyright 2012, 2013 Christoph Reiter
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
"""Read and write Ogg Opus comments.
This module handles Opus files wrapped in an Ogg bitstream. The
first Opus stream found is used.
Based on http://tools.ietf.org/html/draft-terriberry-oggopus-01
"""
__all__ = ["OggOpus", "Open", "delete"]
import struct
from mutagen import StreamInfo
from mutagen._vorbis import VCommentDict
from mutagen.ogg import OggPage, OggFileType, error as OggError
class error(OggError):
pass
class OggOpusHeaderError(error):
pass
class OggOpusInfo(StreamInfo):
"""Ogg Opus stream information.
Attributes:
* length - file length in seconds, as a float
* channels - number of channels
"""
length = 0
def __init__(self, fileobj):
page = OggPage(fileobj)
while not page.packets[0].startswith(b"OpusHead"):
page = OggPage(fileobj)
self.serial = page.serial
if not page.first:
raise OggOpusHeaderError(
"page has ID header, but doesn't start a stream")
(version, self.channels, pre_skip, orig_sample_rate, output_gain,
channel_map) = struct.unpack("<BBHIhB", page.packets[0][8:19])
self.__pre_skip = pre_skip
# only the higher 4 bits change on incombatible changes
major, minor = version >> 4, version & 0xF
minor
if major != 0:
raise OggOpusHeaderError("version %r unsupported" % major)
def _post_tags(self, fileobj):
page = OggPage.find_last(fileobj, self.serial)
self.length = (page.position - self.__pre_skip) / float(48000)
def pprint(self):
return u"Ogg Opus, %.2f seconds" % (self.length)
class OggOpusVComment(VCommentDict):
"""Opus comments embedded in an Ogg bitstream."""
def __get_comment_pages(self, fileobj, info):
# find the first tags page with the right serial
page = OggPage(fileobj)
while info.serial != page.serial or \
not page.packets[0].startswith(b"OpusTags"):
page = OggPage(fileobj)
# get all comment pages
pages = [page]
while not (pages[-1].complete or len(pages[-1].packets) > 1):
page = OggPage(fileobj)
if page.serial == pages[0].serial:
pages.append(page)
return pages
def __init__(self, fileobj, info):
pages = self.__get_comment_pages(fileobj, info)
data = OggPage.to_packets(pages)[0][8:] # Strip OpusTags
super(OggOpusVComment, self).__init__(data, framing=False)
def _inject(self, fileobj):
fileobj.seek(0)
info = OggOpusInfo(fileobj)
old_pages = self.__get_comment_pages(fileobj, info)
packets = OggPage.to_packets(old_pages)
packets[0] = b"OpusTags" + self.write(framing=False)
new_pages = OggPage.from_packets(packets, old_pages[0].sequence)
OggPage.replace(fileobj, old_pages, new_pages)
class OggOpus(OggFileType):
"""An Ogg Opus file."""
_Info = OggOpusInfo
_Tags = OggOpusVComment
_Error = OggOpusHeaderError
_mimes = ["audio/ogg", "audio/ogg; codecs=opus"]
@staticmethod
def score(filename, fileobj, header):
return (header.startswith(b"OggS") * (b"OpusHead" in header))
Open = OggOpus
def delete(filename):
"""Remove tags from a file."""
OggOpus(filename).delete()
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