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|
# 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
# -----------------------------------------------------------------------------
import asyncio
import datetime
import functools
import io
import secrets
import struct
import sys
import bumble.logging
from bumble import data_types
from bumble.core import AdvertisingData
from bumble.device import Device
from bumble.hci import CodecID, CodingFormat, HCI_IsoDataPacket
from bumble.profiles.ascs import AseStateMachine, AudioStreamControlService
from bumble.profiles.bap import (
AudioLocation,
CodecSpecificCapabilities,
CodecSpecificConfiguration,
ContextType,
SupportedFrameDuration,
SupportedSamplingFrequency,
UnicastServerAdvertisingData,
)
from bumble.profiles.cap import CommonAudioServiceService
from bumble.profiles.csip import CoordinatedSetIdentificationService, SirkType
from bumble.profiles.pacs import PacRecord, PublishedAudioCapabilitiesService
from bumble.transport import open_transport
def _sink_pac_record() -> PacRecord:
return PacRecord(
coding_format=CodingFormat(CodecID.LC3),
codec_specific_capabilities=CodecSpecificCapabilities(
supported_sampling_frequencies=(
SupportedSamplingFrequency.FREQ_8000
| SupportedSamplingFrequency.FREQ_16000
| SupportedSamplingFrequency.FREQ_24000
| SupportedSamplingFrequency.FREQ_32000
| SupportedSamplingFrequency.FREQ_48000
),
supported_frame_durations=(
SupportedFrameDuration.DURATION_7500_US_SUPPORTED
| SupportedFrameDuration.DURATION_10000_US_SUPPORTED
),
supported_audio_channel_count=[1, 2],
min_octets_per_codec_frame=26,
max_octets_per_codec_frame=240,
supported_max_codec_frames_per_sdu=2,
),
)
file_outputs: dict[AseStateMachine, io.BufferedWriter] = {}
# -----------------------------------------------------------------------------
async def main() -> None:
if len(sys.argv) < 3:
print('Usage: run_cig_setup.py <config-file> <transport-spec-for-device>')
return
print('<<< connecting to HCI...')
async with await open_transport(sys.argv[2]) as hci_transport:
print('<<< connected')
device = Device.from_config_file_with_hci(
sys.argv[1], hci_transport.source, hci_transport.sink
)
device.cis_enabled = True
await device.power_on()
csis = CoordinatedSetIdentificationService(
set_identity_resolving_key=secrets.token_bytes(16),
set_identity_resolving_key_type=SirkType.PLAINTEXT,
)
device.add_service(CommonAudioServiceService(csis))
device.add_service(
PublishedAudioCapabilitiesService(
supported_source_context=ContextType.PROHIBITED,
available_source_context=ContextType.PROHIBITED,
supported_sink_context=ContextType(0xFF), # All context types
available_sink_context=ContextType(0xFF), # All context types
sink_audio_locations=(
AudioLocation.FRONT_LEFT | AudioLocation.FRONT_RIGHT
),
sink_pac=[_sink_pac_record()],
)
)
ascs = AudioStreamControlService(device, sink_ase_id=[1], source_ase_id=[2])
device.add_service(ascs)
advertising_data = (
bytes(
AdvertisingData(
[
data_types.CompleteLocalName('Bumble LE Audio'),
data_types.Flags(
AdvertisingData.LE_GENERAL_DISCOVERABLE_MODE_FLAG
| AdvertisingData.BR_EDR_HOST_FLAG
| AdvertisingData.BR_EDR_CONTROLLER_FLAG
),
data_types.IncompleteListOf16BitServiceUUIDs(
[PublishedAudioCapabilitiesService.UUID]
),
]
)
)
+ csis.get_advertising_data()
+ bytes(UnicastServerAdvertisingData())
)
def on_pdu(ase: AseStateMachine, pdu: HCI_IsoDataPacket):
# LC3 format: |frame_length(2)| + |frame(length)|.
sdu = b''
if pdu.iso_sdu_length:
sdu = struct.pack('<H', pdu.iso_sdu_length)
sdu += pdu.iso_sdu_fragment
file_outputs[ase].write(sdu)
def on_ase_state_change(ase: AseStateMachine) -> None:
if ase.state != AseStateMachine.State.STREAMING:
if file_output := file_outputs.pop(ase, None):
file_output.close()
else:
file_output = open(f'{datetime.datetime.now().isoformat()}.lc3', 'wb')
codec_configuration = ase.codec_specific_configuration
if (
not isinstance(codec_configuration, CodecSpecificConfiguration)
or codec_configuration.sampling_frequency is None
or codec_configuration.audio_channel_allocation is None
or codec_configuration.frame_duration is None
):
return
# Write a LC3 header.
file_output.write(
bytes([0x1C, 0xCC]) # Header.
+ struct.pack(
'<HHHHHHI',
18, # Header length.
codec_configuration.sampling_frequency.hz
// 100, # Sampling Rate(/100Hz).
0, # Bitrate(unused).
bin(codec_configuration.audio_channel_allocation).count(
'1'
), # Channels.
codec_configuration.frame_duration.us
// 10, # Frame duration(/10us).
0, # RFU.
0x0FFFFFFF, # Frame counts.
)
)
file_outputs[ase] = file_output
assert ase.cis_link
ase.cis_link.sink = functools.partial(on_pdu, ase)
for ase in ascs.ase_state_machines.values():
ase.on(
'state_change',
functools.partial(on_ase_state_change, ase=ase),
)
await device.create_advertising_set(
advertising_data=advertising_data,
auto_restart=True,
)
await hci_transport.source.terminated
# -----------------------------------------------------------------------------
bumble.logging.setup_basic_logging('DEBUG')
asyncio.run(main())
|
