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// Copyright 2019 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 "content/public/browser/audio_service.h"
#include "base/command_line.h"
#include "base/deferred_sequenced_task_runner.h"
#include "base/metrics/field_trial_params.h"
#include "base/no_destructor.h"
#include "base/optional.h"
#include "base/strings/string_number_conversions.h"
#include "base/threading/sequence_local_storage_slot.h"
#include "base/time/time.h"
#include "build/build_config.h"
#include "content/browser/browser_main_loop.h"
#include "content/browser/service_sandbox_type.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/content_browser_client.h"
#include "content/public/browser/service_process_host.h"
#include "content/public/common/content_client.h"
#include "content/public/common/content_features.h"
#include "content/public/common/content_switches.h"
#include "media/audio/audio_manager.h"
#include "media/base/media_switches.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "services/audio/public/cpp/audio_system_to_service_adapter.h"
#include "services/audio/service.h"
#include "services/audio/service_factory.h"
namespace content {
namespace {
base::Optional<base::TimeDelta> GetFieldTrialIdleTimeout() {
std::string timeout_str =
base::GetFieldTrialParamValue("AudioService", "teardown_timeout_s");
int timeout_s = 0;
if (!base::StringToInt(timeout_str, &timeout_s))
return base::nullopt;
return base::TimeDelta::FromSeconds(timeout_s);
}
base::Optional<base::TimeDelta> GetCommandLineIdleTimeout() {
const base::CommandLine& command_line =
*base::CommandLine::ForCurrentProcess();
std::string timeout_str =
command_line.GetSwitchValueASCII(switches::kAudioServiceQuitTimeoutMs);
int timeout_ms = 0;
if (!base::StringToInt(timeout_str, &timeout_ms))
return base::nullopt;
return base::TimeDelta::FromMilliseconds(timeout_ms);
}
base::Optional<base::TimeDelta> GetAudioServiceProcessIdleTimeout() {
base::Optional<base::TimeDelta> timeout = GetCommandLineIdleTimeout();
if (!timeout)
timeout = GetFieldTrialIdleTimeout();
if (timeout && *timeout < base::TimeDelta())
return base::nullopt;
return timeout;
}
bool IsAudioServiceOutOfProcess() {
return !base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kSingleProcess) &&
base::FeatureList::IsEnabled(features::kAudioServiceOutOfProcess) &&
!GetContentClient()->browser()->OverridesAudioManager();
}
void BindSystemInfoFromAnySequence(
mojo::PendingReceiver<audio::mojom::SystemInfo> receiver) {
if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
GetUIThreadTaskRunner({})->PostTask(
FROM_HERE,
base::BindOnce(&BindSystemInfoFromAnySequence, std::move(receiver)));
return;
}
GetAudioService().BindSystemInfo(std::move(receiver));
}
void BindStreamFactoryFromAnySequence(
mojo::PendingReceiver<audio::mojom::StreamFactory> receiver) {
if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
GetUIThreadTaskRunner({})->PostTask(
FROM_HERE,
base::BindOnce(&BindStreamFactoryFromAnySequence, std::move(receiver)));
return;
}
GetAudioService().BindStreamFactory(std::move(receiver));
}
void LaunchAudioServiceInProcess(
mojo::PendingReceiver<audio::mojom::AudioService> receiver) {
// NOTE: If BrowserMainLoop is uninitialized, we have no AudioManager. In
// this case we discard the receiver. The remote will always discard
// messages. This is to work around unit testing environments where no
// BrowserMainLoop is initialized.
if (!BrowserMainLoop::GetInstance())
return;
// TODO(https://crbug.com/853254): Remove
// BrowserMainLoop::GetAudioManager().
audio::Service::GetInProcessTaskRunner()->PostTask(
FROM_HERE,
base::BindOnce(
[](media::AudioManager* audio_manager,
mojo::PendingReceiver<audio::mojom::AudioService> receiver) {
static base::NoDestructor<
base::SequenceLocalStorageSlot<std::unique_ptr<audio::Service>>>
service;
service->GetOrCreateValue() = audio::CreateEmbeddedService(
audio_manager, std::move(receiver));
},
BrowserMainLoop::GetAudioManager(), std::move(receiver)));
}
void LaunchAudioServiceOutOfProcess(
mojo::PendingReceiver<audio::mojom::AudioService> receiver) {
ServiceProcessHost::Launch(
std::move(receiver),
ServiceProcessHost::Options()
.WithDisplayName("Audio Service")
#if defined(OS_MAC)
// On Mac, the audio service requires a CFRunLoop provided by a
// UI MessageLoop type, to run AVFoundation and CoreAudio code.
// See https://crbug.com/834581.
.WithExtraCommandLineSwitches({switches::kMessageLoopTypeUi})
#endif
.Pass());
}
void LaunchAudioService(mojo::Remote<audio::mojom::AudioService>* remote) {
auto receiver = remote->BindNewPipeAndPassReceiver();
if (IsAudioServiceOutOfProcess()) {
LaunchAudioServiceOutOfProcess(std::move(receiver));
if (auto idle_timeout = GetAudioServiceProcessIdleTimeout())
remote->reset_on_idle_timeout(*idle_timeout);
} else {
LaunchAudioServiceInProcess(std::move(receiver));
}
remote->reset_on_disconnect();
}
} // namespace
audio::mojom::AudioService& GetAudioService() {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
// NOTE: We use sequence-local storage slot not because we support access from
// any sequence, but to limit the lifetime of this Remote to the lifetime of
// UI-thread sequence. This is to support re-creation after task environment
// shutdown and reinitialization e.g. between unit tests.
static base::NoDestructor<
base::SequenceLocalStorageSlot<mojo::Remote<audio::mojom::AudioService>>>
remote_slot;
auto& remote = remote_slot->GetOrCreateValue();
if (!remote)
LaunchAudioService(&remote);
return *remote.get();
}
std::unique_ptr<media::AudioSystem> CreateAudioSystemForAudioService() {
constexpr auto kServiceDisconnectTimeout = base::TimeDelta::FromSeconds(1);
return std::make_unique<audio::AudioSystemToServiceAdapter>(
base::BindRepeating(&BindSystemInfoFromAnySequence),
kServiceDisconnectTimeout);
}
AudioServiceStreamFactoryBinder GetAudioServiceStreamFactoryBinder() {
return base::BindRepeating(&BindStreamFactoryFromAnySequence);
}
} // namespace content
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