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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
from typing import Any
import bumble.logging
from bumble.a2dp import (
A2DP_SBC_CODEC_TYPE,
SbcMediaCodecInformation,
make_audio_sink_service_sdp_records,
)
from bumble.avdtp import (
AVDTP_AUDIO_MEDIA_TYPE,
Listener,
MediaCodecCapabilities,
Protocol,
)
from bumble.core import PhysicalTransport
from bumble.device import Device
from bumble.transport import open_transport
Context: dict[Any, Any] = {'output': None}
# -----------------------------------------------------------------------------
def sdp_records():
service_record_handle = 0x00010001
return {
service_record_handle: make_audio_sink_service_sdp_records(
service_record_handle
)
}
# -----------------------------------------------------------------------------
def codec_capabilities():
# NOTE: this shouldn't be hardcoded, but passed on the command line instead
return MediaCodecCapabilities(
media_type=AVDTP_AUDIO_MEDIA_TYPE,
media_codec_type=A2DP_SBC_CODEC_TYPE,
media_codec_information=SbcMediaCodecInformation(
sampling_frequency=SbcMediaCodecInformation.SamplingFrequency.SF_48000
| SbcMediaCodecInformation.SamplingFrequency.SF_44100
| SbcMediaCodecInformation.SamplingFrequency.SF_32000
| SbcMediaCodecInformation.SamplingFrequency.SF_16000,
channel_mode=SbcMediaCodecInformation.ChannelMode.MONO
| SbcMediaCodecInformation.ChannelMode.DUAL_CHANNEL
| SbcMediaCodecInformation.ChannelMode.STEREO
| SbcMediaCodecInformation.ChannelMode.JOINT_STEREO,
block_length=SbcMediaCodecInformation.BlockLength.BL_4
| SbcMediaCodecInformation.BlockLength.BL_8
| SbcMediaCodecInformation.BlockLength.BL_12
| SbcMediaCodecInformation.BlockLength.BL_16,
subbands=SbcMediaCodecInformation.Subbands.S_4
| SbcMediaCodecInformation.Subbands.S_8,
allocation_method=SbcMediaCodecInformation.AllocationMethod.LOUDNESS
| SbcMediaCodecInformation.AllocationMethod.SNR,
minimum_bitpool_value=2,
maximum_bitpool_value=53,
),
)
# -----------------------------------------------------------------------------
def on_avdtp_connection(server):
# Add a sink endpoint to the server
sink = server.add_sink(codec_capabilities())
sink.on('rtp_packet', on_rtp_packet)
# -----------------------------------------------------------------------------
def on_rtp_packet(packet):
header = packet.payload[0]
fragmented = header >> 7
# start = (header >> 6) & 0x01
# last = (header >> 5) & 0x01
number_of_frames = header & 0x0F
if fragmented:
print(f'RTP: fragment {number_of_frames}')
else:
print(f'RTP: {number_of_frames} frames')
Context['output'].write(packet.payload[1:])
# -----------------------------------------------------------------------------
async def main() -> None:
if len(sys.argv) < 4:
print(
'Usage: run_a2dp_sink.py <device-config> <transport-spec> <sbc-file> '
'[<bt-addr>]'
)
print('example: run_a2dp_sink.py classic1.json usb:0 output.sbc')
return
print('<<< connecting to HCI...')
async with await open_transport(sys.argv[2]) as hci_transport:
print('<<< connected')
with open(sys.argv[3], 'wb') as sbc_file:
Context['output'] = sbc_file
# Create a device
device = Device.from_config_file_with_hci(
sys.argv[1], hci_transport.source, hci_transport.sink
)
device.classic_enabled = True
# Setup the SDP to expose the sink service
device.sdp_service_records = sdp_records()
# Start the controller
await device.power_on()
# Create a listener to wait for AVDTP connections
listener = Listener.for_device(device)
listener.on('connection', on_avdtp_connection)
if len(sys.argv) >= 5:
# Connect to the source
target_address = sys.argv[4]
print(f'=== Connecting to {target_address}...')
connection = await device.connect(
target_address, transport=PhysicalTransport.BR_EDR
)
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')
server = await Protocol.connect(connection)
listener.set_server(connection, server)
sink = server.add_sink(codec_capabilities())
sink.on('rtp_packet', on_rtp_packet)
else:
# Start being discoverable and connectable
await device.set_discoverable(True)
await device.set_connectable(True)
await hci_transport.source.terminated
# -----------------------------------------------------------------------------
bumble.logging.setup_basic_logging('DEBUG')
asyncio.run(main())
|
