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136 lines
4.8 KiB
136 lines
4.8 KiB
//
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// Copyright (C) 2017 Google, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at:
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#pragma once
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#include <atomic>
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#include <mutex>
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#include "base/macros.h"
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#include "bluetooth/uuid.h"
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#include "service/bluetooth_instance.h"
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#include "service/common/bluetooth/avrcp_media_attr.h"
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#include "service/common/bluetooth/service.h"
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#include "service/hal/bluetooth_avrcp_interface.h"
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namespace bluetooth {
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class AvrcpControl : public BluetoothInstance,
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private hal::BluetoothAvrcpInterface::ControlObserver {
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public:
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class Delegate {
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public:
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virtual void OnConnectionState(bool rc_connect, bool bt_connect,
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const std::string& device_address) = 0;
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virtual void OnTrackChanged(const std::string& device_address,
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const AvrcpMediaAttr& attr) = 0;
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virtual void OnSetAbsVolumeRequest(const std::string& device_address,
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int32_t abs_vol, int32_t label) = 0;
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virtual void OnRegisterForAbsVolumeCallbackRequest(
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const std::string& device_address, int32_t label) = 0;
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protected:
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virtual ~Delegate() = default;
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};
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// The destructor automatically unregisters this instance from the stack.
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~AvrcpControl() override;
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// Assigns a delegate to this instance. |delegate| must out-live this
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// AvrcpControl instance.
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void SetDelegate(Delegate* delegate);
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// BluetoothClientInstace overrides:
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const Uuid& GetAppIdentifier() const override;
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int GetInstanceId() const override;
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bool Enable();
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void Disable();
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// Send a remote control button command. Commands which can be sent
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// are defined here:
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// http://1394ta.org/wp-content/uploads/2015/07/2007001.pdf
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bool SendPassThroughCommand(const std::string& device_address,
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uint8_t key_code, bool key_pressed);
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// Send a response to a request to change absolute volume.
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bool SetAbsVolumeResponse(const std::string& device_address, int32_t abs_vol,
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int32_t label);
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// Send a response to a register for absolute volume change callback.
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bool RegisterForAbsVolumeCallbackResponse(const std::string& device_address,
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int32_t response_type,
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int32_t abs_vol, int32_t label);
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private:
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friend class AvrcpControlFactory;
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// Constructor shouldn't be called directly as instances are meant to be
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// obtained from the factory.
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AvrcpControl(const Uuid& uuid, int control_id);
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// hal::BluetoothAvrcpInterface::ControlObserver implementation:
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void ConnectionStateCallback(bool rc_connect, bool bt_connect,
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const RawAddress& bd_addr) override;
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void CtrlSetabsvolCmdCallback(const RawAddress& bd_addr, uint8_t abs_vol,
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uint8_t label) override;
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void CtrlRegisternotificationAbsVolCallback(const RawAddress& bd_addr,
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uint8_t label) override;
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void CtrlTrackChangedCallback(const RawAddress& bd_addr, uint8_t num_attr,
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btrc_element_attr_val_t* p_attrs) override;
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// See getters for documentation.
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const Uuid app_identifier_;
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const int control_id_;
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// Mutex that synchronizes access to the entries below.
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std::mutex mutex_;
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// Raw handle to the Delegate, which must outlive this AvrcpControl instance.
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std::mutex delegate_mutex_;
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Delegate* delegate_ = nullptr;
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DISALLOW_COPY_AND_ASSIGN(AvrcpControl);
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};
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// AvrcpControlFactory is used to register and obtain a per-application
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// AvrcpControl
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// instance. Users should call RegisterClient to obtain their own unique
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// AvrcpControl instance that has been registered with the Bluetooth stack.
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class AvrcpControlFactory
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: public BluetoothInstanceFactory,
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private hal::BluetoothAvrcpInterface::ControlObserver {
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public:
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// Don't construct/destruct directly except in tests. Instead, obtain a handle
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// from an Adapter instance.
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AvrcpControlFactory();
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~AvrcpControlFactory() override;
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// BluetoothInstanceFactory override:
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bool RegisterInstance(const Uuid& uuid,
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const RegisterCallback& callback) override;
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private:
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std::atomic<int> next_control_id_{0};
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DISALLOW_COPY_AND_ASSIGN(AvrcpControlFactory);
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};
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} // namespace bluetooth
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