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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ui/global_media_controls/media_notification_device_provider_impl.h"
#include <algorithm>
#include "chrome/browser/ui/global_media_controls/media_notification_device_monitor.h"
#include "content/public/browser/audio_service.h"
#include "media/audio/audio_device_description.h"
namespace {
// Remove the default fallback device from the given list of audio device
// descriptions if it is possible to determine which of the other devices is
// fallen back to. If such a device is found, it's unique id will be
// overwritten with |media::AudioDeviceDescription::kDefaultDeviceId|.
void MaybeRemoveDefaultDevice(media::AudioDeviceDescriptions& descriptions) {
// Determine which of the audio devices is the fallback "default" device.
auto default_device_it = std::ranges::find(
descriptions, media::AudioDeviceDescription::kDefaultDeviceId,
&media::AudioDeviceDescription::unique_id);
// If there is no default device, there is nothing to remove.
if (default_device_it == descriptions.end()) {
return;
}
// If name of the device associated with the default id is known, the default
// device description will contain that name prefixed by a localized string.
// See media::AudioDeviceDescription::LocalizeDeviceDescriptions for more
// context.
// Note that due to complexities with how the default device is reported by
// PulseAudio, the default device name will not contain the name of the real
// device on Linux. In this case, the default device name does not contain
// the following prefix.
const std::string default_device_name_prefix =
media::AudioDeviceDescription::GetDefaultDeviceName() + " - ";
if (base::StartsWith(default_device_it->device_name,
default_device_name_prefix)) {
std::string real_default_device_name =
default_device_it->device_name.substr(
default_device_name_prefix.size());
// Find all the devices that have the name of the real default device.
std::vector<media::AudioDeviceDescriptions::iterator>
devices_with_real_default_name;
for (auto it = descriptions.begin(); it != descriptions.end(); ++it) {
if (it->device_name == real_default_device_name) {
devices_with_real_default_name.push_back(it);
}
}
if (devices_with_real_default_name.size() == 1) {
// If there is only one device that has name of the real default device,
// there is no ambiguity as to if this device is the real default device.
// In this case, we should remove the "default" fallback device from the
// list and mark the real device as "default".
devices_with_real_default_name.front()->unique_id =
media::AudioDeviceDescription::kDefaultDeviceId;
descriptions.erase(default_device_it);
}
}
}
} // anonymous namespace
MediaNotificationDeviceProviderImpl::MediaNotificationDeviceProviderImpl(
std::unique_ptr<media::AudioSystem> audio_system)
: audio_system_(std::move(audio_system)) {
output_device_callback_list_.set_removal_callback(base::BindRepeating(
&MediaNotificationDeviceProviderImpl::OnSubscriberRemoved,
weak_ptr_factory_.GetWeakPtr()));
}
MediaNotificationDeviceProviderImpl::~MediaNotificationDeviceProviderImpl() {
if (monitor_) {
monitor_->RemoveDevicesChangedObserver(this);
}
}
base::CallbackListSubscription
MediaNotificationDeviceProviderImpl::RegisterOutputDeviceDescriptionsCallback(
GetOutputDevicesCallback cb) {
if (!monitor_) {
monitor_ = MediaNotificationDeviceMonitor::Create(this);
monitor_->AddDevicesChangedObserver(this);
}
monitor_->StartMonitoring();
if (has_device_list_) {
cb.Run(audio_device_descriptions_);
}
auto subscription = output_device_callback_list_.Add(std::move(cb));
if (!has_device_list_) {
GetDevices();
}
return subscription;
}
void MediaNotificationDeviceProviderImpl::GetOutputDeviceDescriptions(
media::AudioSystem::OnDeviceDescriptionsCallback cb) {
if (!audio_system_) {
audio_system_ = content::CreateAudioSystemForAudioService();
}
audio_system_->GetDeviceDescriptions(
/*for_input=*/false,
base::BindOnce(
[](media::AudioSystem::OnDeviceDescriptionsCallback cb,
media::AudioDeviceDescriptions descriptions) {
MaybeRemoveDefaultDevice(descriptions);
std::move(cb).Run(descriptions);
},
std::move(cb)));
}
void MediaNotificationDeviceProviderImpl::OnDevicesChanged() {
GetDevices();
}
void MediaNotificationDeviceProviderImpl::GetDevices() {
if (is_querying_for_output_devices_) {
return;
}
is_querying_for_output_devices_ = true;
GetOutputDeviceDescriptions(
base::BindOnce(&MediaNotificationDeviceProviderImpl::NotifySubscribers,
weak_ptr_factory_.GetWeakPtr()));
}
void MediaNotificationDeviceProviderImpl::NotifySubscribers(
media::AudioDeviceDescriptions descriptions) {
is_querying_for_output_devices_ = false;
audio_device_descriptions_ = std::move(descriptions);
has_device_list_ = true;
output_device_callback_list_.Notify(audio_device_descriptions_);
}
void MediaNotificationDeviceProviderImpl::OnSubscriberRemoved() {
if (output_device_callback_list_.empty()) {
monitor_->StopMonitoring();
}
}
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