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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/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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