[WIP] Move media/capture to device/capture

media/capture/device_monitor_udev.cc

-// 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.
-
-// libudev is used for monitoring device changes.
-
-#include "media/capture/device_monitor_udev.h"
-
-#include <stddef.h>
-
-#include <string>
-
-#include "base/macros.h"
-#include "base/system_monitor/system_monitor.h"
-#include "device/udev_linux/udev.h"
-#include "device/udev_linux/udev_linux.h"
-
-namespace {
-
-struct SubsystemMap {
-  base::SystemMonitor::DeviceType device_type;
-  const char* subsystem;
-  const char* devtype;
-};
-
-const char kAudioSubsystem[] = "sound";
-const char kVideoSubsystem[] = "video4linux";
-
-// Add more subsystems here for monitoring.
-const SubsystemMap kSubsystemMap[] = {
-    {base::SystemMonitor::DEVTYPE_AUDIO_CAPTURE, kAudioSubsystem, NULL},
-    {base::SystemMonitor::DEVTYPE_VIDEO_CAPTURE, kVideoSubsystem, NULL},
-};
-
-}  // namespace
-
-namespace media {
-
-DeviceMonitorLinux::DeviceMonitorLinux(
-    const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner)
-    : io_task_runner_(io_task_runner) {
-  io_task_runner_->PostTask(
-      FROM_HERE,
-      base::Bind(&DeviceMonitorLinux::Initialize, base::Unretained(this)));
-}
-
-DeviceMonitorLinux::~DeviceMonitorLinux() {}
-
-void DeviceMonitorLinux::Initialize() {
-  DCHECK(io_task_runner_->BelongsToCurrentThread());
-
-  // We want to be notified of IO message loop destruction to delete |udev_|.
-  base::MessageLoop::current()->AddDestructionObserver(this);
-
-  std::vector<device::UdevLinux::UdevMonitorFilter> filters;
-  for (const SubsystemMap& entry : kSubsystemMap) {
-    filters.push_back(
-        device::UdevLinux::UdevMonitorFilter(entry.subsystem, entry.devtype));
-  }
-  udev_.reset(new device::UdevLinux(
-      filters, base::Bind(&DeviceMonitorLinux::OnDevicesChanged,
-                          base::Unretained(this))));
-}
-
-void DeviceMonitorLinux::WillDestroyCurrentMessageLoop() {
-  DCHECK(io_task_runner_->BelongsToCurrentThread());
-  udev_.reset();
-}
-
-void DeviceMonitorLinux::OnDevicesChanged(udev_device* device) {
-  DCHECK(io_task_runner_->BelongsToCurrentThread());
-  DCHECK(device);
-
-  base::SystemMonitor::DeviceType device_type =
-      base::SystemMonitor::DEVTYPE_UNKNOWN;
-  const std::string subsystem(device::udev_device_get_subsystem(device));
-  for (const SubsystemMap& entry : kSubsystemMap) {
-    if (subsystem == entry.subsystem) {
-      device_type = entry.device_type;
-      break;
-    }
-  }
-  DCHECK_NE(device_type, base::SystemMonitor::DEVTYPE_UNKNOWN);
-
-  base::SystemMonitor::Get()->ProcessDevicesChanged(device_type);
-}
-
-}  // namespace media