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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MEDIA_MIDI_MIDI_MANAGER_WINRT_H_
#define MEDIA_MIDI_MIDI_MANAGER_WINRT_H_
#include <memory>
#include "base/strings/string16.h"
#include "base/threading/thread.h"
#include "media/midi/midi_manager.h"
namespace base {
class ThreadChecker;
}
namespace midi {
class MidiScheduler;
class MidiService;
class MIDI_EXPORT MidiManagerWinrt final : public MidiManager {
public:
explicit MidiManagerWinrt(MidiService* service);
~MidiManagerWinrt() override;
// MidiManager overrides:
void StartInitialization() final;
void Finalize() final;
void DispatchSendMidiData(MidiManagerClient* client,
uint32_t port_index,
const std::vector<uint8_t>& data,
double timestamp) final;
private:
// Callbacks on the COM thread.
void InitializeOnComThread();
void FinalizeOnComThread();
void SendOnComThread(uint32_t port_index, const std::vector<uint8_t>& data);
// Callback from MidiPortManager::OnEnumerationComplete on the COM thread.
// Calls CompleteInitialization() when both MidiPortManagers are ready.
void OnPortManagerReady();
// Subclasses that access private/protected members of MidiManager.
template <typename InterfaceType,
typename RuntimeType,
typename StaticsInterfaceType,
base::char16 const* runtime_class_id>
class MidiPortManager;
class MidiInPortManager;
class MidiOutPortManager;
// COM-initialized thread for calling WinRT methods.
base::Thread com_thread_;
// Lock to ensure all smart pointers initialized in InitializeOnComThread()
// and destroyed in FinalizeOnComThread() will not be accidentally destructed
// twice in the destructor.
base::Lock lazy_init_member_lock_;
// Should be instantiated on COM thread.
std::unique_ptr<base::ThreadChecker>
com_thread_checker_; // GUARDED_BY(lazy_init_member_lock_)
// All operations to MidiPortManager should be done on COM thread.
std::unique_ptr<MidiInPortManager>
port_manager_in_; // GUARDED_BY(lazy_init_member_lock_)
std::unique_ptr<MidiOutPortManager>
port_manager_out_; // GUARDED_BY(lazy_init_member_lock_)
// |scheduler_| is used by DispatchSendMidiData on Chrome_IOThread, should
// acquire lock before use.
std::unique_ptr<MidiScheduler>
scheduler_; // GUARDED_BY(lazy_init_member_lock_)
// Incremented when a MidiPortManager is ready.
uint8_t port_manager_ready_count_ = 0;
DISALLOW_COPY_AND_ASSIGN(MidiManagerWinrt);
};
} // namespace midi
#endif // MEDIA_MIDI_MIDI_MANAGER_WINRT_H_
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