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// Copyright 2013 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.
#include "media/base/user_input_monitor.h"
#include <ApplicationServices/ApplicationServices.h>
#include <stddef.h>
#include <memory>
#include "base/task/single_thread_task_runner.h"
#include "base/timer/timer.h"
namespace media {
namespace {
// Update key press count in shared memory twice as frequent as
// AudioInputController::AudioCallback::OnData() callback for WebRTC.
constexpr base::TimeDelta kUpdateKeyPressCountIntervalMs =
base::Milliseconds(5);
class UserInputMonitorMac : public UserInputMonitorBase {
public:
UserInputMonitorMac();
UserInputMonitorMac(const UserInputMonitorMac&) = delete;
UserInputMonitorMac& operator=(const UserInputMonitorMac&) = delete;
~UserInputMonitorMac() override;
uint32_t GetKeyPressCount() const override;
private:
void StartKeyboardMonitoring() override;
void StartKeyboardMonitoring(
base::WritableSharedMemoryMapping mapping) override;
void StopKeyboardMonitoring() override;
void UpdateKeyPressCountShmem();
// Used for sharing key press count value.
std::unique_ptr<base::WritableSharedMemoryMapping> key_press_count_mapping_;
// Timer for updating key press count in |key_press_count_mapping_|.
base::RepeatingTimer key_press_count_timer_;
};
UserInputMonitorMac::UserInputMonitorMac() {}
UserInputMonitorMac::~UserInputMonitorMac() {}
uint32_t UserInputMonitorMac::GetKeyPressCount() const {
// Use |kCGEventSourceStateHIDSystemState| since we only want to count
// hardware generated events.
return CGEventSourceCounterForEventType(kCGEventSourceStateHIDSystemState,
kCGEventKeyDown);
}
void UserInputMonitorMac::StartKeyboardMonitoring() {}
void UserInputMonitorMac::StartKeyboardMonitoring(
base::WritableSharedMemoryMapping mapping) {
key_press_count_mapping_ =
std::make_unique<base::WritableSharedMemoryMapping>(std::move(mapping));
key_press_count_timer_.Start(FROM_HERE, kUpdateKeyPressCountIntervalMs, this,
&UserInputMonitorMac::UpdateKeyPressCountShmem);
}
void UserInputMonitorMac::StopKeyboardMonitoring() {
if (!key_press_count_mapping_)
return;
key_press_count_timer_.AbandonAndStop();
key_press_count_mapping_.reset();
}
void UserInputMonitorMac::UpdateKeyPressCountShmem() {
DCHECK(key_press_count_mapping_);
WriteKeyPressMonitorCount(*key_press_count_mapping_, GetKeyPressCount());
}
} // namespace
std::unique_ptr<UserInputMonitor> UserInputMonitor::Create(
scoped_refptr<base::SingleThreadTaskRunner> input_task_runner,
scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner) {
return std::make_unique<UserInputMonitorMac>();
}
} // namespace media
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