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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.
// 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
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