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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.
"""LE Audio - Telephony and Media Audio Profile"""
# -----------------------------------------------------------------------------
# Imports
# -----------------------------------------------------------------------------
import enum
import logging
import struct
from bumble.gatt import (
GATT_TELEPHONY_AND_MEDIA_AUDIO_SERVICE,
GATT_TMAP_ROLE_CHARACTERISTIC,
Characteristic,
TemplateService,
)
from bumble.gatt_adapters import DelegatedCharacteristicProxyAdapter
from bumble.gatt_client import CharacteristicProxy, ProfileServiceProxy, ServiceProxy
# -----------------------------------------------------------------------------
# Logging
# -----------------------------------------------------------------------------
logger = logging.getLogger(__name__)
# -----------------------------------------------------------------------------
# Classes
# -----------------------------------------------------------------------------
class Role(enum.IntFlag):
CALL_GATEWAY = 1 << 0
CALL_TERMINAL = 1 << 1
UNICAST_MEDIA_SENDER = 1 << 2
UNICAST_MEDIA_RECEIVER = 1 << 3
BROADCAST_MEDIA_SENDER = 1 << 4
BROADCAST_MEDIA_RECEIVER = 1 << 5
# -----------------------------------------------------------------------------
class TelephonyAndMediaAudioService(TemplateService):
UUID = GATT_TELEPHONY_AND_MEDIA_AUDIO_SERVICE
role_characteristic: Characteristic[bytes]
def __init__(self, role: Role):
self.role_characteristic = Characteristic(
GATT_TMAP_ROLE_CHARACTERISTIC,
Characteristic.Properties.READ,
Characteristic.READABLE,
struct.pack('<H', int(role)),
)
super().__init__([self.role_characteristic])
# -----------------------------------------------------------------------------
class TelephonyAndMediaAudioServiceProxy(ProfileServiceProxy):
SERVICE_CLASS = TelephonyAndMediaAudioService
role: CharacteristicProxy[Role]
def __init__(self, service_proxy: ServiceProxy):
self.service_proxy = service_proxy
self.role = DelegatedCharacteristicProxyAdapter(
service_proxy.get_required_characteristic_by_uuid(
GATT_TMAP_ROLE_CHARACTERISTIC
),
decode=lambda value: Role(
struct.unpack_from('<H', value, 0)[0],
),
)
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