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# Copyright 2021-2022 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 sys
import os
import logging
from bumble.colors import color
from bumble.device import Device
from bumble.transport import open_transport_or_link
from bumble.core import BT_BR_EDR_TRANSPORT
from bumble.avdtp import (
find_avdtp_service_with_connection,
AVDTP_AUDIO_MEDIA_TYPE,
MediaCodecCapabilities,
MediaPacketPump,
Protocol,
Listener,
)
from bumble.a2dp import (
SBC_JOINT_STEREO_CHANNEL_MODE,
SBC_LOUDNESS_ALLOCATION_METHOD,
make_audio_source_service_sdp_records,
A2DP_SBC_CODEC_TYPE,
SbcMediaCodecInformation,
SbcPacketSource,
)
# -----------------------------------------------------------------------------
def sdp_records():
service_record_handle = 0x00010001
return {
service_record_handle: make_audio_source_service_sdp_records(
service_record_handle
)
}
# -----------------------------------------------------------------------------
def codec_capabilities():
# NOTE: this shouldn't be hardcoded, but should be inferred from the input file
# instead
return MediaCodecCapabilities(
media_type=AVDTP_AUDIO_MEDIA_TYPE,
media_codec_type=A2DP_SBC_CODEC_TYPE,
media_codec_information=SbcMediaCodecInformation.from_discrete_values(
sampling_frequency=44100,
channel_mode=SBC_JOINT_STEREO_CHANNEL_MODE,
block_length=16,
subbands=8,
allocation_method=SBC_LOUDNESS_ALLOCATION_METHOD,
minimum_bitpool_value=2,
maximum_bitpool_value=53,
),
)
# -----------------------------------------------------------------------------
def on_avdtp_connection(read_function, protocol):
packet_source = SbcPacketSource(
read_function, protocol.l2cap_channel.peer_mtu, codec_capabilities()
)
packet_pump = MediaPacketPump(packet_source.packets)
protocol.add_source(packet_source.codec_capabilities, packet_pump)
# -----------------------------------------------------------------------------
async def stream_packets(read_function, protocol):
# Discover all endpoints on the remote device
endpoints = await protocol.discover_remote_endpoints()
for endpoint in endpoints:
print('@@@', endpoint)
# Select a sink
sink = protocol.find_remote_sink_by_codec(
AVDTP_AUDIO_MEDIA_TYPE, A2DP_SBC_CODEC_TYPE
)
if sink is None:
print(color('!!! no SBC sink found', 'red'))
return
print(f'### Selected sink: {sink.seid}')
# Stream the packets
packet_source = SbcPacketSource(
read_function, protocol.l2cap_channel.peer_mtu, codec_capabilities()
)
packet_pump = MediaPacketPump(packet_source.packets)
source = protocol.add_source(packet_source.codec_capabilities, packet_pump)
stream = await protocol.create_stream(source, sink)
await stream.start()
await asyncio.sleep(5)
await stream.stop()
await asyncio.sleep(5)
await stream.start()
await asyncio.sleep(5)
await stream.stop()
await stream.close()
# -----------------------------------------------------------------------------
async def main():
if len(sys.argv) < 4:
print(
'Usage: run_a2dp_source.py <device-config> <transport-spec> <sbc-file> '
'[<bluetooth-address>]'
)
print(
'example: run_a2dp_source.py classic1.json usb:0 test.sbc E1:CA:72:48:C4:E8'
)
return
print('<<< connecting to HCI...')
async with await open_transport_or_link(sys.argv[2]) as (hci_source, hci_sink):
print('<<< connected')
# Create a device
device = Device.from_config_file_with_hci(sys.argv[1], hci_source, hci_sink)
device.classic_enabled = True
# Setup the SDP to expose the SRC service
device.sdp_service_records = sdp_records()
# Start
await device.power_on()
with open(sys.argv[3], 'rb') as sbc_file:
# NOTE: this should be using asyncio file reading, but blocking reads are
# good enough for testing
async def read(byte_count):
return sbc_file.read(byte_count)
if len(sys.argv) > 4:
# Connect to a peer
target_address = sys.argv[4]
print(f'=== Connecting to {target_address}...')
connection = await device.connect(
target_address, transport=BT_BR_EDR_TRANSPORT
)
print(f'=== Connected to {connection.peer_address}!')
# Request authentication
print('*** Authenticating...')
await connection.authenticate()
print('*** Authenticated')
# Enable encryption
print('*** Enabling encryption...')
await connection.encrypt()
print('*** Encryption on')
# Look for an A2DP service
avdtp_version = await find_avdtp_service_with_connection(connection)
if not avdtp_version:
print(color('!!! no A2DP service found'))
return
# Create a client to interact with the remote device
protocol = await Protocol.connect(connection, avdtp_version)
# Start streaming
await stream_packets(read, protocol)
else:
# Create a listener to wait for AVDTP connections
listener = Listener.for_device(device=device, version=(1, 2))
listener.on(
'connection', lambda protocol: on_avdtp_connection(read, protocol)
)
# Become connectable and wait for a connection
await device.set_discoverable(True)
await device.set_connectable(True)
await hci_source.wait_for_termination()
# -----------------------------------------------------------------------------
logging.basicConfig(level=os.environ.get('BUMBLE_LOGLEVEL', 'DEBUG').upper())
asyncio.run(main())
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