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Enso-Bot/venv/Lib/site-packages/discord/oggparse.py

99 lines
3.1 KiB
Python

# -*- coding: utf-8 -*-
"""
The MIT License (MIT)
Copyright (c) 2015-2020 Rapptz
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.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
"""
import struct
from .errors import DiscordException
class OggError(DiscordException):
"""An exception that is thrown for Ogg stream parsing errors."""
pass
# https://tools.ietf.org/html/rfc3533
# https://tools.ietf.org/html/rfc7845
class OggPage:
_header = struct.Struct('<xBQIIIB')
def __init__(self, stream):
try:
header = stream.read(struct.calcsize(self._header.format))
self.flag, self.gran_pos, self.serial, \
self.pagenum, self.crc, self.segnum = self._header.unpack(header)
self.segtable = stream.read(self.segnum)
bodylen = sum(struct.unpack('B'*self.segnum, self.segtable))
self.data = stream.read(bodylen)
except Exception:
raise OggError('bad data stream') from None
def iter_packets(self):
packetlen = offset = 0
partial = True
for seg in self.segtable:
if seg == 255:
packetlen += 255
partial = True
else:
packetlen += seg
yield self.data[offset:offset+packetlen], True
offset += packetlen
packetlen = 0
partial = False
if partial:
yield self.data[offset:], False
class OggStream:
def __init__(self, stream):
self.stream = stream
def _next_page(self):
head = self.stream.read(4)
if head == b'OggS':
return OggPage(self.stream)
elif not head:
return None
else:
raise OggError('invalid header magic')
def _iter_pages(self):
page = self._next_page()
while page:
yield page
page = self._next_page()
def iter_packets(self):
partial = b''
for page in self._iter_pages():
for data, complete in page.iter_packets():
partial += data
if complete:
yield partial
partial = b''