| // |
| // Copyright (C) 2017 Google, Inc. |
| // |
| // 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: |
| // |
| // http://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. |
| // |
| |
| #pragma once |
| |
| #include <atomic> |
| #include <mutex> |
| #include <string> |
| #include <vector> |
| |
| #include "service/bluetooth_instance.h" |
| #include "service/common/bluetooth/a2dp_codec_config.h" |
| #include "service/hal/bluetooth_av_interface.h" |
| #include "types/raw_address.h" |
| |
| namespace bluetooth { |
| |
| class A2dpSource : public BluetoothInstance, |
| private hal::BluetoothAvInterface::A2dpSourceObserver { |
| public: |
| // We only allow one instance of this object at a time. |
| static const int kSingletonInstanceId; |
| |
| class Delegate { |
| public: |
| virtual void OnConnectionState(const std::string& device_address, |
| int state) = 0; |
| virtual void OnAudioState(const std::string& device_address, int state) = 0; |
| virtual void OnAudioConfig( |
| const std::string& device_address, A2dpCodecConfig codec_config, |
| const std::vector<A2dpCodecConfig>& codecs_local_capabilities, |
| const std::vector<A2dpCodecConfig>& codecs_selectable_capabilities) = 0; |
| |
| protected: |
| virtual ~Delegate() = default; |
| }; |
| |
| A2dpSource(const A2dpSource&) = delete; |
| A2dpSource& operator=(const A2dpSource&) = delete; |
| |
| ~A2dpSource() override; |
| |
| void SetDelegate(Delegate* delegate); |
| |
| // BluetoothInstance implementation: |
| const Uuid& GetAppIdentifier() const override; |
| int GetInstanceId() const override; |
| |
| bool Enable(const std::vector<A2dpCodecConfig>& codec_priorities); |
| void Disable(); |
| bool Connect(const std::string& device_address); |
| bool Disconnect(const std::string& device_address); |
| bool ConfigCodec(const std::string& device_address, |
| const std::vector<A2dpCodecConfig>& codec_preferences); |
| |
| private: |
| friend class A2dpSourceFactory; |
| |
| explicit A2dpSource(const Uuid& uuid); |
| |
| // hal::bluetooth::hal::BluetoothAvInterface::Observer implementation: |
| void ConnectionStateCallback(hal::BluetoothAvInterface* iface, |
| const RawAddress& bd_addr, |
| btav_connection_state_t state) override; |
| void AudioStateCallback(hal::BluetoothAvInterface* iface, |
| const RawAddress& bd_addr, |
| btav_audio_state_t state) override; |
| void AudioConfigCallback( |
| hal::BluetoothAvInterface* iface, const RawAddress& bd_addr, |
| const btav_a2dp_codec_config_t& codec_config, |
| const std::vector<btav_a2dp_codec_config_t> codecs_local_capabilities, |
| const std::vector<btav_a2dp_codec_config_t> |
| codecs_selectable_capabilities) override; |
| bool MandatoryCodecPreferredCallback(hal::BluetoothAvInterface* iface, |
| const RawAddress& bd_addr) override; |
| |
| // For |GetAppIdentifier|. |
| const Uuid app_identifier_; |
| |
| std::mutex mutex_; |
| |
| // A second mutex is used only for |delegate_|. We cannot use |mutex_| because |
| // it may cause a deadlock if the caller and Delegate both take the same lock |
| // 'clock'. |
| // In that scenario, the caller may take 'clock' first and will try to take |
| // |mutex_| second. The callback will take |mutex_| first and invoke a |
| // delegate function which attempts to take 'clock'. |
| std::mutex delegate_mutex_; |
| Delegate* delegate_ = nullptr; |
| }; |
| |
| class A2dpSourceFactory : public BluetoothInstanceFactory { |
| public: |
| A2dpSourceFactory(); |
| A2dpSourceFactory(const A2dpSourceFactory&) = delete; |
| A2dpSourceFactory& operator=(const A2dpSourceFactory&) = delete; |
| |
| ~A2dpSourceFactory() override; |
| |
| // BluetoothInstanceFactory override: |
| bool RegisterInstance(const Uuid& uuid, |
| const RegisterCallback& callback) override; |
| }; |
| |
| } // namespace bluetooth |