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""" |
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This is a modified version of discord.py's OggParse module |
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Copyright (c) 2015-2021 Rapptz |
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Copyright (c) 2021-present Pincer |
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:license: MIT, see LICENSE for details |
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""" |
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from __future__ import annotations |
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import struct |
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from typing import TYPE_CHECKING, ClassVar, IO, Generator, Tuple, Optional |
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from .exceptions import PincerError |
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__all__ = ( |
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'OggError', |
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'OggPage', |
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'OggStream', |
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) |
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class OggError(PincerError): |
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"""An exception that is thrown for Ogg stream parsing errors.""" |
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pass |
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# https://tools.ietf.org/html/rfc3533 |
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# https://tools.ietf.org/html/rfc7845 |
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class OggPage: |
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_header: ClassVar[struct.Struct] = struct.Struct('<xBQIIIB') |
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if TYPE_CHECKING: |
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flag: int |
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gran_pos: int |
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serial: int |
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pagenum: int |
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crc: int |
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segnum: int |
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def __init__(self, stream: IO[bytes]) -> None: |
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try: |
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header = stream.read(struct.calcsize(self._header.format)) |
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self.flag, self.gran_pos, self.serial, \ |
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self.pagenum, self.crc, self.segnum = self._header.unpack(header) |
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self.segtable: bytes = stream.read(self.segnum) |
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bodylen = sum(struct.unpack('B'*self.segnum, self.segtable)) |
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self.data: bytes = stream.read(bodylen) |
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except Exception: |
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raise OggError('bad data stream') from None |
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def iter_packets(self) -> Generator[Tuple[bytes, bool], None, None]: |
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packetlen = offset = 0 |
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partial = True |
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for seg in self.segtable: |
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if seg == 255: |
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packetlen += 255 |
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partial = True |
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else: |
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packetlen += seg |
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yield self.data[offset:offset+packetlen], True |
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offset += packetlen |
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packetlen = 0 |
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partial = False |
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if partial: |
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yield self.data[offset:], False |
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class OggStream: |
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def __init__(self, stream: IO[bytes]) -> None: |
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self.stream: IO[bytes] = stream |
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def _next_page(self) -> Optional[OggPage]: |
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head = self.stream.read(4) |
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if head == b'OggS': |
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return OggPage(self.stream) |
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elif not head: |
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return None |
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else: |
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raise OggError('invalid header magic') |
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def _iter_pages(self) -> Generator[OggPage, None, None]: |
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page = self._next_page() |
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while page: |
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yield page |
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page = self._next_page() |
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89
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def iter_packets(self) -> Generator[bytes, None, None]: |
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90
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partial = b'' |
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for page in self._iter_pages(): |
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for data, complete in page.iter_packets(): |
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partial += data |
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if complete: |
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yield partial |
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partial = b'' |
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Pincer-org /
Pincer
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