//
|
// 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 <base/macros.h>
|
|
#include "service/bluetooth_instance.h"
|
#include "service/common/bluetooth/a2dp_codec_config.h"
|
#include "service/hal/bluetooth_av_interface.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() 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;
|
|
// 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;
|
|
DISALLOW_COPY_AND_ASSIGN(A2dpSource);
|
};
|
|
class A2dpSourceFactory : public BluetoothInstanceFactory {
|
public:
|
A2dpSourceFactory();
|
~A2dpSourceFactory() override;
|
|
// BluetoothInstanceFactory override:
|
bool RegisterInstance(const Uuid& uuid,
|
const RegisterCallback& callback) override;
|
|
private:
|
DISALLOW_COPY_AND_ASSIGN(A2dpSourceFactory);
|
};
|
|
} // namespace bluetooth
|
