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| 1 // Copyright 2013 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 // libudev is used for monitoring device changes. | |
| 6 | |
| 7 #include "media/capture/device_monitor_udev.h" | |
| 8 | |
| 9 #include <stddef.h> | |
| 10 | |
| 11 #include <string> | |
| 12 | |
| 13 #include "base/macros.h" | |
| 14 #include "base/system_monitor/system_monitor.h" | |
| 15 #include "device/udev_linux/udev.h" | |
| 16 #include "device/udev_linux/udev_linux.h" | |
| 17 | |
| 18 namespace { | |
| 19 | |
| 20 struct SubsystemMap { | |
| 21 base::SystemMonitor::DeviceType device_type; | |
| 22 const char* subsystem; | |
| 23 const char* devtype; | |
| 24 }; | |
| 25 | |
| 26 const char kAudioSubsystem[] = "sound"; | |
| 27 const char kVideoSubsystem[] = "video4linux"; | |
| 28 | |
| 29 // Add more subsystems here for monitoring. | |
| 30 const SubsystemMap kSubsystemMap[] = { | |
| 31 {base::SystemMonitor::DEVTYPE_AUDIO_CAPTURE, kAudioSubsystem, NULL}, | |
| 32 {base::SystemMonitor::DEVTYPE_VIDEO_CAPTURE, kVideoSubsystem, NULL}, | |
| 33 }; | |
| 34 | |
| 35 } // namespace | |
| 36 | |
| 37 namespace media { | |
| 38 | |
| 39 DeviceMonitorLinux::DeviceMonitorLinux( | |
| 40 const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner) | |
| 41 : io_task_runner_(io_task_runner) { | |
| 42 io_task_runner_->PostTask( | |
| 43 FROM_HERE, | |
| 44 base::Bind(&DeviceMonitorLinux::Initialize, base::Unretained(this))); | |
| 45 } | |
| 46 | |
| 47 DeviceMonitorLinux::~DeviceMonitorLinux() {} | |
| 48 | |
| 49 void DeviceMonitorLinux::Initialize() { | |
| 50 DCHECK(io_task_runner_->BelongsToCurrentThread()); | |
| 51 | |
| 52 // We want to be notified of IO message loop destruction to delete |udev_|. | |
| 53 base::MessageLoop::current()->AddDestructionObserver(this); | |
| 54 | |
| 55 std::vector<device::UdevLinux::UdevMonitorFilter> filters; | |
| 56 for (const SubsystemMap& entry : kSubsystemMap) { | |
| 57 filters.push_back( | |
| 58 device::UdevLinux::UdevMonitorFilter(entry.subsystem, entry.devtype)); | |
| 59 } | |
| 60 udev_.reset(new device::UdevLinux( | |
| 61 filters, base::Bind(&DeviceMonitorLinux::OnDevicesChanged, | |
| 62 base::Unretained(this)))); | |
| 63 } | |
| 64 | |
| 65 void DeviceMonitorLinux::WillDestroyCurrentMessageLoop() { | |
| 66 DCHECK(io_task_runner_->BelongsToCurrentThread()); | |
| 67 udev_.reset(); | |
| 68 } | |
| 69 | |
| 70 void DeviceMonitorLinux::OnDevicesChanged(udev_device* device) { | |
| 71 DCHECK(io_task_runner_->BelongsToCurrentThread()); | |
| 72 DCHECK(device); | |
| 73 | |
| 74 base::SystemMonitor::DeviceType device_type = | |
| 75 base::SystemMonitor::DEVTYPE_UNKNOWN; | |
| 76 const std::string subsystem(device::udev_device_get_subsystem(device)); | |
| 77 for (const SubsystemMap& entry : kSubsystemMap) { | |
| 78 if (subsystem == entry.subsystem) { | |
| 79 device_type = entry.device_type; | |
| 80 break; | |
| 81 } | |
| 82 } | |
| 83 DCHECK_NE(device_type, base::SystemMonitor::DEVTYPE_UNKNOWN); | |
| 84 | |
| 85 base::SystemMonitor::Get()->ProcessDevicesChanged(device_type); | |
| 86 } | |
| 87 | |
| 88 } // namespace media | |
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Chromium Code Reviews
Issue 2224643002:
Move device monitors out of //media/capture into //media/device_monitors (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master