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- // Copyright 2018 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 "services/audio/device_notifier.h"
- #include <utility>
- #include "base/bind.h"
- #include "base/task/sequenced_task_runner.h"
- #include "base/threading/sequenced_task_runner_handle.h"
- #include "base/trace_event/trace_event.h"
- namespace audio {
- DeviceNotifier::DeviceNotifier()
- : task_runner_(base::SequencedTaskRunnerHandle::Get()) {
- base::SystemMonitor::Get()->AddDevicesChangedObserver(this);
- }
- DeviceNotifier::~DeviceNotifier() {
- DCHECK(task_runner_->RunsTasksInCurrentSequence());
- base::SystemMonitor::Get()->RemoveDevicesChangedObserver(this);
- }
- void DeviceNotifier::Bind(
- mojo::PendingReceiver<mojom::DeviceNotifier> receiver) {
- DCHECK(task_runner_->RunsTasksInCurrentSequence());
- receivers_.Add(this, std::move(receiver));
- }
- void DeviceNotifier::RegisterListener(
- mojo::PendingRemote<mojom::DeviceListener> listener) {
- DCHECK(task_runner_->RunsTasksInCurrentSequence());
- TRACE_EVENT1("audio", "audio::DeviceNotifier::RegisterListener", "id",
- next_listener_id_);
- int listener_id = next_listener_id_++;
- auto& new_listener = listeners_[listener_id];
- new_listener.Bind(std::move(listener));
- new_listener.set_disconnect_handler(
- base::BindOnce(&DeviceNotifier::RemoveListener,
- weak_factory_.GetWeakPtr(), listener_id));
- }
- void DeviceNotifier::OnDevicesChanged(
- base::SystemMonitor::DeviceType device_type) {
- if (device_type != base::SystemMonitor::DEVTYPE_AUDIO)
- return;
- TRACE_EVENT0("audio", "audio::DeviceNotifier::OnDevicesChanged");
- task_runner_->PostTask(FROM_HERE,
- base::BindOnce(&DeviceNotifier::UpdateListeners,
- weak_factory_.GetWeakPtr()));
- }
- void DeviceNotifier::UpdateListeners() {
- DCHECK(task_runner_->RunsTasksInCurrentSequence());
- TRACE_EVENT0("audio", "audio::DeviceNotifier::UpdateListeners");
- for (const auto& listener : listeners_)
- listener.second->DevicesChanged();
- }
- void DeviceNotifier::RemoveListener(int listener_id) {
- DCHECK(task_runner_->RunsTasksInCurrentSequence());
- TRACE_EVENT1("audio", "audio::DeviceNotifier::RemoveListener", "id",
- listener_id);
- listeners_.erase(listener_id);
- }
- } // namespace audio
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