blob: de1f70b5b96c9c8235f015e0def5ba8db95ad4f1 [file] [log] [blame]
* Copyright 2020 The Chromium OS 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 <memory>
#include <string>
#include <vector>
#include <base/callback.h>
#include <base/containers/flat_map.h>
#include <base/files/scoped_file.h>
#include <base/synchronization/lock.h>
#include <base/threading/thread.h>
#include "cros-camera/cros_camera_hal.h"
namespace cros {
// CameraPrivacySwitchMonitor is a monitor for the status change of camera
// privacy switch.
class CameraPrivacySwitchMonitor final {
CameraPrivacySwitchMonitor(const CameraPrivacySwitchMonitor&) = delete;
CameraPrivacySwitchMonitor& operator=(const CameraPrivacySwitchMonitor&) =
void RegisterCallback(PrivacySwitchStateChangeCallback callback);
// Try to activate the event loop to subscribe the privacy event if it hasn't
// been started by given |camera_id| and its corresponding |device_path|.
void TrySubscribe(int camera_id, const std::string& device_path);
// Remove the |camera_id| from the subscription list.
void Unsubscribe(int camera_id);
void OnStatusChanged(int camera_id, PrivacySwitchState state);
// Subscribe the camera privacy switch status changed as privacy v4l2-event
// with given |camera_id| and |device_fd|.
void SubscribeEvent(int camera_id, base::ScopedFD device_fd);
// Unsubscribe the camera privacy switch status changed as privacy v4l2-event.
void UnsubscribeEvents();
// Keep dequeuing the v4l2-events from device.
void RunDequeueEventsLoop();
// Triggers the event thread to restart the loop.
void RestartEventLoop();
PrivacySwitchState state_;
PrivacySwitchStateChangeCallback callback_;
// The thread for dequeing v4l2-events.
base::Thread event_thread_;
base::Lock camera_id_lock_;
// The map for subscribed camera ids and their file descriptors.
base::flat_map<int, base::ScopedFD> subscribed_camera_id_to_fd_
// The endpoint for writing of the pipe to control the event loop. Writing
// things into the pipe can restart the event loop. Closing the pipe will stop
// the event loop.
base::ScopedFD control_pipe_;
// The endpoint for reading of the pipe to control the event loop.
base::ScopedFD control_fd_;
} // namespace cros