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# Copyright 2021-2024 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 json
import sys
from typing import Optional
import websockets.asyncio.server
import bumble.logging
from bumble import data_types
from bumble.core import AdvertisingData
from bumble.device import (
AdvertisingEventProperties,
AdvertisingParameters,
Connection,
Device,
Peer,
)
from bumble.hci import CodecID, CodingFormat, OwnAddressType
from bumble.profiles.ascs import AudioStreamControlService
from bumble.profiles.bap import (
AudioLocation,
CodecSpecificCapabilities,
ContextType,
SupportedFrameDuration,
SupportedSamplingFrequency,
UnicastServerAdvertisingData,
)
from bumble.profiles.mcp import (
GenericMediaControlServiceProxy,
MediaControlPointOpcode,
MediaControlServiceProxy,
MediaState,
)
from bumble.profiles.pacs import PacRecord, PublishedAudioCapabilitiesService
from bumble.transport import open_transport
# -----------------------------------------------------------------------------
async def main() -> None:
if len(sys.argv) < 3:
print('Usage: run_mcp_client.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
)
await device.power_on()
# Add "placeholder" services to enable Android LEA features.
device.add_service(
PublishedAudioCapabilitiesService(
supported_source_context=ContextType.PROHIBITED,
available_source_context=ContextType.PROHIBITED,
supported_sink_context=ContextType.MEDIA,
available_sink_context=ContextType.MEDIA,
sink_audio_locations=(
AudioLocation.FRONT_LEFT | AudioLocation.FRONT_RIGHT
),
sink_pac=[
PacRecord(
coding_format=CodingFormat(CodecID.LC3),
codec_specific_capabilities=CodecSpecificCapabilities(
supported_sampling_frequencies=(
SupportedSamplingFrequency.FREQ_16000
| SupportedSamplingFrequency.FREQ_32000
| SupportedSamplingFrequency.FREQ_48000
),
supported_frame_durations=(
SupportedFrameDuration.DURATION_10000_US_SUPPORTED
),
supported_audio_channel_count=[1, 2],
min_octets_per_codec_frame=0,
max_octets_per_codec_frame=320,
supported_max_codec_frames_per_sdu=2,
),
),
],
)
)
device.add_service(AudioStreamControlService(device, sink_ase_id=[1]))
ws: Optional[websockets.asyncio.server.ServerConnection] = None
mcp: Optional[MediaControlServiceProxy] = None
advertising_data = bytes(
AdvertisingData(
[
data_types.CompleteLocalName('Bumble LE Audio'),
data_types.Flags(AdvertisingData.LE_GENERAL_DISCOVERABLE_MODE_FLAG),
data_types.IncompleteListOf16BitServiceUUIDs(
[PublishedAudioCapabilitiesService.UUID]
),
]
)
) + bytes(UnicastServerAdvertisingData())
await device.create_advertising_set(
advertising_parameters=AdvertisingParameters(
advertising_event_properties=AdvertisingEventProperties(),
own_address_type=OwnAddressType.RANDOM,
primary_advertising_interval_max=100,
primary_advertising_interval_min=100,
),
advertising_data=advertising_data,
auto_restart=True,
)
def on_media_state(media_state: MediaState) -> None:
if ws:
asyncio.create_task(
ws.send(json.dumps({'media_state': media_state.name}))
)
def on_track_title(title: str) -> None:
if ws:
asyncio.create_task(ws.send(json.dumps({'title': title})))
def on_track_duration(duration: int) -> None:
if ws:
asyncio.create_task(ws.send(json.dumps({'duration': duration})))
def on_track_position(position: int) -> None:
if ws:
asyncio.create_task(ws.send(json.dumps({'position': position})))
def on_connection(connection: Connection) -> None:
async def on_connection_async():
async with Peer(connection) as peer:
nonlocal mcp
mcp = peer.create_service_proxy(MediaControlServiceProxy)
if not mcp:
mcp = peer.create_service_proxy(GenericMediaControlServiceProxy)
mcp.on('media_state', on_media_state)
mcp.on('track_title', on_track_title)
mcp.on('track_duration', on_track_duration)
mcp.on('track_position', on_track_position)
await mcp.subscribe_characteristics()
connection.cancel_on_disconnection(on_connection_async())
device.on('connection', on_connection)
async def serve(websocket: websockets.asyncio.server.ServerConnection):
nonlocal ws
ws = websocket
async for message in websocket:
request = json.loads(message)
if mcp:
await mcp.write_control_point(
MediaControlPointOpcode(request['opcode'])
)
ws = None
await websockets.asyncio.server.serve(serve, 'localhost', 8989)
await hci_transport.source.terminated
# -----------------------------------------------------------------------------
bumble.logging.setup_basic_logging('DEBUG')
asyncio.run(main())
|
