mirror of
https://github.com/google/bumble.git
synced 2026-04-16 00:25:31 +00:00
611 lines
21 KiB
Python
611 lines
21 KiB
Python
# Copyright 2021-2023 Google LLC
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# https://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
|
|
|
|
# -----------------------------------------------------------------------------
|
|
# Imports
|
|
# -----------------------------------------------------------------------------
|
|
from __future__ import annotations
|
|
|
|
import dataclasses
|
|
import enum
|
|
import functools
|
|
import logging
|
|
import struct
|
|
from collections.abc import Sequence
|
|
|
|
from typing_extensions import Self
|
|
|
|
from bumble import core, data_types, gatt, hci, utils
|
|
from bumble.profiles import le_audio
|
|
|
|
# -----------------------------------------------------------------------------
|
|
# Logging
|
|
# -----------------------------------------------------------------------------
|
|
logger = logging.getLogger(__name__)
|
|
|
|
# -----------------------------------------------------------------------------
|
|
# Constants
|
|
# -----------------------------------------------------------------------------
|
|
|
|
|
|
class AudioLocation(enum.IntFlag):
|
|
'''Bluetooth Assigned Numbers, Section 6.12.1 - Audio Location'''
|
|
|
|
# fmt: off
|
|
NOT_ALLOWED = 0x00000000
|
|
FRONT_LEFT = 0x00000001
|
|
FRONT_RIGHT = 0x00000002
|
|
FRONT_CENTER = 0x00000004
|
|
LOW_FREQUENCY_EFFECTS_1 = 0x00000008
|
|
BACK_LEFT = 0x00000010
|
|
BACK_RIGHT = 0x00000020
|
|
FRONT_LEFT_OF_CENTER = 0x00000040
|
|
FRONT_RIGHT_OF_CENTER = 0x00000080
|
|
BACK_CENTER = 0x00000100
|
|
LOW_FREQUENCY_EFFECTS_2 = 0x00000200
|
|
SIDE_LEFT = 0x00000400
|
|
SIDE_RIGHT = 0x00000800
|
|
TOP_FRONT_LEFT = 0x00001000
|
|
TOP_FRONT_RIGHT = 0x00002000
|
|
TOP_FRONT_CENTER = 0x00004000
|
|
TOP_CENTER = 0x00008000
|
|
TOP_BACK_LEFT = 0x00010000
|
|
TOP_BACK_RIGHT = 0x00020000
|
|
TOP_SIDE_LEFT = 0x00040000
|
|
TOP_SIDE_RIGHT = 0x00080000
|
|
TOP_BACK_CENTER = 0x00100000
|
|
BOTTOM_FRONT_CENTER = 0x00200000
|
|
BOTTOM_FRONT_LEFT = 0x00400000
|
|
BOTTOM_FRONT_RIGHT = 0x00800000
|
|
FRONT_LEFT_WIDE = 0x01000000
|
|
FRONT_RIGHT_WIDE = 0x02000000
|
|
LEFT_SURROUND = 0x04000000
|
|
RIGHT_SURROUND = 0x08000000
|
|
|
|
@property
|
|
def channel_count(self) -> int:
|
|
return bin(self.value).count('1')
|
|
|
|
|
|
class AudioInputType(enum.IntEnum):
|
|
'''Bluetooth Assigned Numbers, Section 6.12.2 - Audio Input Type'''
|
|
|
|
# fmt: off
|
|
UNSPECIFIED = 0x00
|
|
BLUETOOTH = 0x01
|
|
MICROPHONE = 0x02
|
|
ANALOG = 0x03
|
|
DIGITAL = 0x04
|
|
RADIO = 0x05
|
|
STREAMING = 0x06
|
|
AMBIENT = 0x07
|
|
|
|
|
|
class ContextType(enum.IntFlag):
|
|
'''Bluetooth Assigned Numbers, Section 6.12.3 - Context Type'''
|
|
|
|
# fmt: off
|
|
PROHIBITED = 0x0000
|
|
UNSPECIFIED = 0x0001
|
|
CONVERSATIONAL = 0x0002
|
|
MEDIA = 0x0004
|
|
GAME = 0x0008
|
|
INSTRUCTIONAL = 0x0010
|
|
VOICE_ASSISTANTS = 0x0020
|
|
LIVE = 0x0040
|
|
SOUND_EFFECTS = 0x0080
|
|
NOTIFICATIONS = 0x0100
|
|
RINGTONE = 0x0200
|
|
ALERTS = 0x0400
|
|
EMERGENCY_ALARM = 0x0800
|
|
|
|
|
|
class SamplingFrequency(utils.OpenIntEnum):
|
|
'''Bluetooth Assigned Numbers, Section 6.12.5.1 - Sampling Frequency'''
|
|
|
|
# fmt: off
|
|
FREQ_8000 = 0x01
|
|
FREQ_11025 = 0x02
|
|
FREQ_16000 = 0x03
|
|
FREQ_22050 = 0x04
|
|
FREQ_24000 = 0x05
|
|
FREQ_32000 = 0x06
|
|
FREQ_44100 = 0x07
|
|
FREQ_48000 = 0x08
|
|
FREQ_88200 = 0x09
|
|
FREQ_96000 = 0x0A
|
|
FREQ_176400 = 0x0B
|
|
FREQ_192000 = 0x0C
|
|
FREQ_384000 = 0x0D
|
|
# fmt: on
|
|
|
|
@classmethod
|
|
def from_hz(cls, frequency: int) -> SamplingFrequency:
|
|
return {
|
|
8000: SamplingFrequency.FREQ_8000,
|
|
11025: SamplingFrequency.FREQ_11025,
|
|
16000: SamplingFrequency.FREQ_16000,
|
|
22050: SamplingFrequency.FREQ_22050,
|
|
24000: SamplingFrequency.FREQ_24000,
|
|
32000: SamplingFrequency.FREQ_32000,
|
|
44100: SamplingFrequency.FREQ_44100,
|
|
48000: SamplingFrequency.FREQ_48000,
|
|
88200: SamplingFrequency.FREQ_88200,
|
|
96000: SamplingFrequency.FREQ_96000,
|
|
176400: SamplingFrequency.FREQ_176400,
|
|
192000: SamplingFrequency.FREQ_192000,
|
|
384000: SamplingFrequency.FREQ_384000,
|
|
}[frequency]
|
|
|
|
@property
|
|
def hz(self) -> int:
|
|
return {
|
|
SamplingFrequency.FREQ_8000: 8000,
|
|
SamplingFrequency.FREQ_11025: 11025,
|
|
SamplingFrequency.FREQ_16000: 16000,
|
|
SamplingFrequency.FREQ_22050: 22050,
|
|
SamplingFrequency.FREQ_24000: 24000,
|
|
SamplingFrequency.FREQ_32000: 32000,
|
|
SamplingFrequency.FREQ_44100: 44100,
|
|
SamplingFrequency.FREQ_48000: 48000,
|
|
SamplingFrequency.FREQ_88200: 88200,
|
|
SamplingFrequency.FREQ_96000: 96000,
|
|
SamplingFrequency.FREQ_176400: 176400,
|
|
SamplingFrequency.FREQ_192000: 192000,
|
|
SamplingFrequency.FREQ_384000: 384000,
|
|
}[self]
|
|
|
|
|
|
class SupportedSamplingFrequency(enum.IntFlag):
|
|
'''Bluetooth Assigned Numbers, Section 6.12.4.1 - Sample Frequency'''
|
|
|
|
# fmt: off
|
|
FREQ_8000 = 1 << (SamplingFrequency.FREQ_8000 - 1)
|
|
FREQ_11025 = 1 << (SamplingFrequency.FREQ_11025 - 1)
|
|
FREQ_16000 = 1 << (SamplingFrequency.FREQ_16000 - 1)
|
|
FREQ_22050 = 1 << (SamplingFrequency.FREQ_22050 - 1)
|
|
FREQ_24000 = 1 << (SamplingFrequency.FREQ_24000 - 1)
|
|
FREQ_32000 = 1 << (SamplingFrequency.FREQ_32000 - 1)
|
|
FREQ_44100 = 1 << (SamplingFrequency.FREQ_44100 - 1)
|
|
FREQ_48000 = 1 << (SamplingFrequency.FREQ_48000 - 1)
|
|
FREQ_88200 = 1 << (SamplingFrequency.FREQ_88200 - 1)
|
|
FREQ_96000 = 1 << (SamplingFrequency.FREQ_96000 - 1)
|
|
FREQ_176400 = 1 << (SamplingFrequency.FREQ_176400 - 1)
|
|
FREQ_192000 = 1 << (SamplingFrequency.FREQ_192000 - 1)
|
|
FREQ_384000 = 1 << (SamplingFrequency.FREQ_384000 - 1)
|
|
# fmt: on
|
|
|
|
@classmethod
|
|
def from_hz(cls, frequencies: Sequence[int]) -> SupportedSamplingFrequency:
|
|
MAPPING = {
|
|
8000: SupportedSamplingFrequency.FREQ_8000,
|
|
11025: SupportedSamplingFrequency.FREQ_11025,
|
|
16000: SupportedSamplingFrequency.FREQ_16000,
|
|
22050: SupportedSamplingFrequency.FREQ_22050,
|
|
24000: SupportedSamplingFrequency.FREQ_24000,
|
|
32000: SupportedSamplingFrequency.FREQ_32000,
|
|
44100: SupportedSamplingFrequency.FREQ_44100,
|
|
48000: SupportedSamplingFrequency.FREQ_48000,
|
|
88200: SupportedSamplingFrequency.FREQ_88200,
|
|
96000: SupportedSamplingFrequency.FREQ_96000,
|
|
176400: SupportedSamplingFrequency.FREQ_176400,
|
|
192000: SupportedSamplingFrequency.FREQ_192000,
|
|
384000: SupportedSamplingFrequency.FREQ_384000,
|
|
}
|
|
|
|
return functools.reduce(
|
|
lambda x, y: x | MAPPING[y],
|
|
frequencies,
|
|
cls(0),
|
|
)
|
|
|
|
|
|
class FrameDuration(enum.IntEnum):
|
|
'''Bluetooth Assigned Numbers, Section 6.12.5.2 - Frame Duration'''
|
|
|
|
# fmt: off
|
|
DURATION_7500_US = 0x00
|
|
DURATION_10000_US = 0x01
|
|
|
|
@property
|
|
def us(self) -> int:
|
|
return {
|
|
FrameDuration.DURATION_7500_US: 7500,
|
|
FrameDuration.DURATION_10000_US: 10000,
|
|
}[self]
|
|
|
|
|
|
class SupportedFrameDuration(enum.IntFlag):
|
|
'''Bluetooth Assigned Numbers, Section 6.12.4.2 - Frame Duration'''
|
|
|
|
# fmt: off
|
|
DURATION_7500_US_SUPPORTED = 0b0001
|
|
DURATION_10000_US_SUPPORTED = 0b0010
|
|
DURATION_7500_US_PREFERRED = 0b0001
|
|
DURATION_10000_US_PREFERRED = 0b0010
|
|
|
|
|
|
class AnnouncementType(utils.OpenIntEnum):
|
|
'''Basic Audio Profile, 3.5.3. Additional Audio Stream Control Service requirements'''
|
|
|
|
# fmt: off
|
|
GENERAL = 0x00
|
|
TARGETED = 0x01
|
|
|
|
|
|
@dataclasses.dataclass
|
|
class UnicastServerAdvertisingData:
|
|
"""Advertising Data for ASCS."""
|
|
|
|
announcement_type: AnnouncementType = AnnouncementType.TARGETED
|
|
available_audio_contexts: ContextType = ContextType.MEDIA
|
|
metadata: bytes = b''
|
|
|
|
def __bytes__(self) -> bytes:
|
|
return bytes(
|
|
core.AdvertisingData(
|
|
[
|
|
data_types.ServiceData16BitUUID(
|
|
gatt.GATT_AUDIO_STREAM_CONTROL_SERVICE,
|
|
struct.pack(
|
|
'<BIB',
|
|
self.announcement_type,
|
|
self.available_audio_contexts,
|
|
len(self.metadata),
|
|
)
|
|
+ self.metadata,
|
|
)
|
|
]
|
|
)
|
|
)
|
|
|
|
|
|
# -----------------------------------------------------------------------------
|
|
# Utils
|
|
# -----------------------------------------------------------------------------
|
|
|
|
|
|
def bits_to_channel_counts(data: int) -> list[int]:
|
|
pos = 0
|
|
counts = []
|
|
while data != 0:
|
|
# Bit 0 = count 1
|
|
# Bit 1 = count 2, and so on
|
|
pos += 1
|
|
if data & 1:
|
|
counts.append(pos)
|
|
data >>= 1
|
|
return counts
|
|
|
|
|
|
def channel_counts_to_bits(counts: Sequence[int]) -> int:
|
|
return sum(set([1 << (count - 1) for count in counts]))
|
|
|
|
|
|
# -----------------------------------------------------------------------------
|
|
# Structures
|
|
# -----------------------------------------------------------------------------
|
|
|
|
|
|
@dataclasses.dataclass
|
|
class CodecSpecificCapabilities:
|
|
'''See:
|
|
* Bluetooth Assigned Numbers, 6.12.4 - Codec Specific Capabilities LTV Structures
|
|
* Basic Audio Profile, 4.3.1 - Codec_Specific_Capabilities LTV requirements
|
|
'''
|
|
|
|
class Type(enum.IntEnum):
|
|
# fmt: off
|
|
SAMPLING_FREQUENCY = 0x01
|
|
FRAME_DURATION = 0x02
|
|
AUDIO_CHANNEL_COUNT = 0x03
|
|
OCTETS_PER_FRAME = 0x04
|
|
CODEC_FRAMES_PER_SDU = 0x05
|
|
|
|
supported_sampling_frequencies: SupportedSamplingFrequency
|
|
supported_frame_durations: SupportedFrameDuration
|
|
supported_audio_channel_count: Sequence[int]
|
|
min_octets_per_codec_frame: int
|
|
max_octets_per_codec_frame: int
|
|
supported_max_codec_frames_per_sdu: int
|
|
|
|
@classmethod
|
|
def from_bytes(cls, data: bytes) -> CodecSpecificCapabilities:
|
|
offset = 0
|
|
# Allowed default values.
|
|
supported_audio_channel_count = [1]
|
|
supported_max_codec_frames_per_sdu = 1
|
|
while offset < len(data):
|
|
length, type = struct.unpack_from('BB', data, offset)
|
|
offset += 2
|
|
value = int.from_bytes(data[offset : offset + length - 1], 'little')
|
|
offset += length - 1
|
|
|
|
if type == CodecSpecificCapabilities.Type.SAMPLING_FREQUENCY:
|
|
supported_sampling_frequencies = SupportedSamplingFrequency(value)
|
|
elif type == CodecSpecificCapabilities.Type.FRAME_DURATION:
|
|
supported_frame_durations = SupportedFrameDuration(value)
|
|
elif type == CodecSpecificCapabilities.Type.AUDIO_CHANNEL_COUNT:
|
|
supported_audio_channel_count = bits_to_channel_counts(value)
|
|
elif type == CodecSpecificCapabilities.Type.OCTETS_PER_FRAME:
|
|
min_octets_per_sample = value & 0xFFFF
|
|
max_octets_per_sample = value >> 16
|
|
elif type == CodecSpecificCapabilities.Type.CODEC_FRAMES_PER_SDU:
|
|
supported_max_codec_frames_per_sdu = value
|
|
|
|
# It is expected here that if some fields are missing, an error should be raised.
|
|
# pylint: disable=possibly-used-before-assignment,used-before-assignment
|
|
return CodecSpecificCapabilities(
|
|
supported_sampling_frequencies=supported_sampling_frequencies,
|
|
supported_frame_durations=supported_frame_durations,
|
|
supported_audio_channel_count=supported_audio_channel_count,
|
|
min_octets_per_codec_frame=min_octets_per_sample,
|
|
max_octets_per_codec_frame=max_octets_per_sample,
|
|
supported_max_codec_frames_per_sdu=supported_max_codec_frames_per_sdu,
|
|
)
|
|
|
|
def __bytes__(self) -> bytes:
|
|
return struct.pack(
|
|
'<BBHBBBBBBBBHHBBB',
|
|
3,
|
|
CodecSpecificCapabilities.Type.SAMPLING_FREQUENCY,
|
|
self.supported_sampling_frequencies,
|
|
2,
|
|
CodecSpecificCapabilities.Type.FRAME_DURATION,
|
|
self.supported_frame_durations,
|
|
2,
|
|
CodecSpecificCapabilities.Type.AUDIO_CHANNEL_COUNT,
|
|
channel_counts_to_bits(self.supported_audio_channel_count),
|
|
5,
|
|
CodecSpecificCapabilities.Type.OCTETS_PER_FRAME,
|
|
self.min_octets_per_codec_frame,
|
|
self.max_octets_per_codec_frame,
|
|
2,
|
|
CodecSpecificCapabilities.Type.CODEC_FRAMES_PER_SDU,
|
|
self.supported_max_codec_frames_per_sdu,
|
|
)
|
|
|
|
|
|
@dataclasses.dataclass
|
|
class CodecSpecificConfiguration:
|
|
'''See:
|
|
* Bluetooth Assigned Numbers, 6.12.5 - Codec Specific Configuration LTV Structures
|
|
* Basic Audio Profile, 4.3.2 - Codec_Specific_Capabilities LTV requirements
|
|
'''
|
|
|
|
class Type(utils.OpenIntEnum):
|
|
# fmt: off
|
|
SAMPLING_FREQUENCY = 0x01
|
|
FRAME_DURATION = 0x02
|
|
AUDIO_CHANNEL_ALLOCATION = 0x03
|
|
OCTETS_PER_FRAME = 0x04
|
|
CODEC_FRAMES_PER_SDU = 0x05
|
|
|
|
sampling_frequency: SamplingFrequency | None = None
|
|
frame_duration: FrameDuration | None = None
|
|
audio_channel_allocation: AudioLocation | None = None
|
|
octets_per_codec_frame: int | None = None
|
|
codec_frames_per_sdu: int | None = None
|
|
|
|
@classmethod
|
|
def from_bytes(cls, data: bytes) -> CodecSpecificConfiguration:
|
|
offset = 0
|
|
sampling_frequency: SamplingFrequency | None = None
|
|
frame_duration: FrameDuration | None = None
|
|
audio_channel_allocation: AudioLocation | None = None
|
|
octets_per_codec_frame: int | None = None
|
|
codec_frames_per_sdu: int | None = None
|
|
|
|
while offset < len(data):
|
|
length, type = struct.unpack_from('BB', data, offset)
|
|
offset += 2
|
|
value = int.from_bytes(data[offset : offset + length - 1], 'little')
|
|
offset += length - 1
|
|
|
|
if type == CodecSpecificConfiguration.Type.SAMPLING_FREQUENCY:
|
|
sampling_frequency = SamplingFrequency(value)
|
|
elif type == CodecSpecificConfiguration.Type.FRAME_DURATION:
|
|
frame_duration = FrameDuration(value)
|
|
elif type == CodecSpecificConfiguration.Type.AUDIO_CHANNEL_ALLOCATION:
|
|
audio_channel_allocation = AudioLocation(value)
|
|
elif type == CodecSpecificConfiguration.Type.OCTETS_PER_FRAME:
|
|
octets_per_codec_frame = value
|
|
elif type == CodecSpecificConfiguration.Type.CODEC_FRAMES_PER_SDU:
|
|
codec_frames_per_sdu = value
|
|
|
|
return CodecSpecificConfiguration(
|
|
sampling_frequency=sampling_frequency,
|
|
frame_duration=frame_duration,
|
|
audio_channel_allocation=audio_channel_allocation,
|
|
octets_per_codec_frame=octets_per_codec_frame,
|
|
codec_frames_per_sdu=codec_frames_per_sdu,
|
|
)
|
|
|
|
def __bytes__(self) -> bytes:
|
|
return b''.join(
|
|
[
|
|
struct.pack(fmt, length, tag, value)
|
|
for fmt, length, tag, value in [
|
|
(
|
|
'<BBB',
|
|
2,
|
|
CodecSpecificConfiguration.Type.SAMPLING_FREQUENCY,
|
|
self.sampling_frequency,
|
|
),
|
|
(
|
|
'<BBB',
|
|
2,
|
|
CodecSpecificConfiguration.Type.FRAME_DURATION,
|
|
self.frame_duration,
|
|
),
|
|
(
|
|
'<BBI',
|
|
5,
|
|
CodecSpecificConfiguration.Type.AUDIO_CHANNEL_ALLOCATION,
|
|
self.audio_channel_allocation,
|
|
),
|
|
(
|
|
'<BBH',
|
|
3,
|
|
CodecSpecificConfiguration.Type.OCTETS_PER_FRAME,
|
|
self.octets_per_codec_frame,
|
|
),
|
|
(
|
|
'<BBB',
|
|
2,
|
|
CodecSpecificConfiguration.Type.CODEC_FRAMES_PER_SDU,
|
|
self.codec_frames_per_sdu,
|
|
),
|
|
]
|
|
if value is not None
|
|
]
|
|
)
|
|
|
|
|
|
@dataclasses.dataclass
|
|
class BroadcastAudioAnnouncement:
|
|
broadcast_id: int
|
|
|
|
@classmethod
|
|
def from_bytes(cls, data: bytes) -> Self:
|
|
return cls(int.from_bytes(data[:3], 'little'))
|
|
|
|
def __bytes__(self) -> bytes:
|
|
return self.broadcast_id.to_bytes(3, 'little')
|
|
|
|
def get_advertising_data(self) -> bytes:
|
|
return bytes(
|
|
core.AdvertisingData(
|
|
[
|
|
data_types.ServiceData16BitUUID(
|
|
gatt.GATT_BROADCAST_AUDIO_ANNOUNCEMENT_SERVICE, bytes(self)
|
|
)
|
|
]
|
|
)
|
|
)
|
|
|
|
|
|
@dataclasses.dataclass
|
|
class BasicAudioAnnouncement:
|
|
@dataclasses.dataclass
|
|
class BIS:
|
|
index: int
|
|
codec_specific_configuration: CodecSpecificConfiguration
|
|
|
|
def __bytes__(self) -> bytes:
|
|
codec_specific_configuration_bytes = bytes(
|
|
self.codec_specific_configuration
|
|
)
|
|
return (
|
|
bytes([self.index, len(codec_specific_configuration_bytes)])
|
|
+ codec_specific_configuration_bytes
|
|
)
|
|
|
|
@dataclasses.dataclass
|
|
class Subgroup:
|
|
codec_id: hci.CodingFormat
|
|
codec_specific_configuration: CodecSpecificConfiguration
|
|
metadata: le_audio.Metadata
|
|
bis: list[BasicAudioAnnouncement.BIS]
|
|
|
|
def __bytes__(self) -> bytes:
|
|
metadata_bytes = bytes(self.metadata)
|
|
codec_specific_configuration_bytes = bytes(
|
|
self.codec_specific_configuration
|
|
)
|
|
return (
|
|
bytes([len(self.bis)])
|
|
+ bytes(self.codec_id)
|
|
+ bytes([len(codec_specific_configuration_bytes)])
|
|
+ codec_specific_configuration_bytes
|
|
+ bytes([len(metadata_bytes)])
|
|
+ metadata_bytes
|
|
+ b''.join(map(bytes, self.bis))
|
|
)
|
|
|
|
presentation_delay: int
|
|
subgroups: list[BasicAudioAnnouncement.Subgroup]
|
|
|
|
@classmethod
|
|
def from_bytes(cls, data: bytes) -> Self:
|
|
presentation_delay = int.from_bytes(data[:3], 'little')
|
|
subgroups = []
|
|
offset = 4
|
|
for _ in range(data[3]):
|
|
num_bis = data[offset]
|
|
offset += 1
|
|
codec_id = hci.CodingFormat.from_bytes(data[offset : offset + 5])
|
|
offset += 5
|
|
codec_specific_configuration_length = data[offset]
|
|
offset += 1
|
|
codec_specific_configuration = data[
|
|
offset : offset + codec_specific_configuration_length
|
|
]
|
|
offset += codec_specific_configuration_length
|
|
metadata_length = data[offset]
|
|
offset += 1
|
|
metadata = le_audio.Metadata.from_bytes(
|
|
data[offset : offset + metadata_length]
|
|
)
|
|
offset += metadata_length
|
|
|
|
bis = []
|
|
for _ in range(num_bis):
|
|
bis_index = data[offset]
|
|
offset += 1
|
|
bis_codec_specific_configuration_length = data[offset]
|
|
offset += 1
|
|
bis_codec_specific_configuration = data[
|
|
offset : offset + bis_codec_specific_configuration_length
|
|
]
|
|
offset += bis_codec_specific_configuration_length
|
|
bis.append(
|
|
cls.BIS(
|
|
bis_index,
|
|
CodecSpecificConfiguration.from_bytes(
|
|
bis_codec_specific_configuration
|
|
),
|
|
)
|
|
)
|
|
|
|
subgroups.append(
|
|
cls.Subgroup(
|
|
codec_id,
|
|
CodecSpecificConfiguration.from_bytes(codec_specific_configuration),
|
|
metadata,
|
|
bis,
|
|
)
|
|
)
|
|
|
|
return cls(presentation_delay, subgroups)
|
|
|
|
def __bytes__(self) -> bytes:
|
|
return (
|
|
self.presentation_delay.to_bytes(3, 'little')
|
|
+ bytes([len(self.subgroups)])
|
|
+ b''.join(map(bytes, self.subgroups))
|
|
)
|
|
|
|
def get_advertising_data(self) -> bytes:
|
|
return bytes(
|
|
core.AdvertisingData(
|
|
[
|
|
data_types.ServiceData16BitUUID(
|
|
gatt.GATT_BASIC_AUDIO_ANNOUNCEMENT_SERVICE, bytes(self)
|
|
)
|
|
]
|
|
)
|
|
)
|