forked from auracaster/bumble_mirror
84 lines
3.0 KiB
Python
84 lines
3.0 KiB
Python
# Copyright 2024 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# https://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# -----------------------------------------------------------------------------
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# Imports
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# -----------------------------------------------------------------------------
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from __future__ import annotations
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import dataclasses
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import struct
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from typing import List, Type
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from typing_extensions import Self
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from bumble import utils
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# -----------------------------------------------------------------------------
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# Classes
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# -----------------------------------------------------------------------------
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@dataclasses.dataclass
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class Metadata:
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'''Bluetooth Assigned Numbers, Section 6.12.6 - Metadata LTV structures.
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As Metadata fields may extend, and Spec doesn't forbid duplication, we don't parse
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Metadata into a key-value style dataclass here. Rather, we encourage users to parse
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again outside the lib.
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'''
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class Tag(utils.OpenIntEnum):
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# fmt: off
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PREFERRED_AUDIO_CONTEXTS = 0x01
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STREAMING_AUDIO_CONTEXTS = 0x02
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PROGRAM_INFO = 0x03
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LANGUAGE = 0x04
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CCID_LIST = 0x05
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PARENTAL_RATING = 0x06
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PROGRAM_INFO_URI = 0x07
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AUDIO_ACTIVE_STATE = 0x08
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BROADCAST_AUDIO_IMMEDIATE_RENDERING_FLAG = 0x09
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ASSISTED_LISTENING_STREAM = 0x0A
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BROADCAST_NAME = 0x0B
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EXTENDED_METADATA = 0xFE
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VENDOR_SPECIFIC = 0xFF
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@dataclasses.dataclass
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class Entry:
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tag: Metadata.Tag
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data: bytes
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@classmethod
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def from_bytes(cls: Type[Self], data: bytes) -> Self:
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return cls(tag=Metadata.Tag(data[0]), data=data[1:])
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def __bytes__(self) -> bytes:
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return bytes([len(self.data) + 1, self.tag]) + self.data
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entries: List[Entry] = dataclasses.field(default_factory=list)
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@classmethod
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def from_bytes(cls: Type[Self], data: bytes) -> Self:
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entries = []
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offset = 0
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length = len(data)
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while offset < length:
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entry_length = data[offset]
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offset += 1
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entries.append(cls.Entry.from_bytes(data[offset : offset + entry_length]))
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offset += entry_length
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return cls(entries)
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def __bytes__(self) -> bytes:
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return b''.join([bytes(entry) for entry in self.entries])
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