chromium/media/base/user_input_monitor.h

// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef MEDIA_BASE_USER_INPUT_MONITOR_H_
#define MEDIA_BASE_USER_INPUT_MONITOR_H_

#include <stddef.h>

#include <memory>

#include "base/memory/read_only_shared_memory_region.h"
#include "base/memory/scoped_refptr.h"
#include "base/sequence_checker.h"
#include "base/synchronization/lock.h"
#include "media/base/media_export.h"

namespace base {
class SingleThreadTaskRunner;
}  // namespace base

namespace media {

// Utility functions for correctly and atomically reading from/writing to a
// shared memory mapping containing key press count.
uint32_t MEDIA_EXPORT
ReadKeyPressMonitorCount(const base::ReadOnlySharedMemoryMapping& shmem);
void MEDIA_EXPORT
WriteKeyPressMonitorCount(const base::WritableSharedMemoryMapping& shmem,
                          uint32_t count);

// Base class for audio:: and media:: UserInputMonitor implementations.
class MEDIA_EXPORT UserInputMonitor { … };

// Monitors and notifies about keyboard events.
class MEDIA_EXPORT UserInputMonitorBase : public UserInputMonitor { … };

}  // namespace media

#endif  // MEDIA_BASE_USER_INPUT_MONITOR_H_