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// Copyright 2019 The Chromium Authors
// 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/auto_reset.h"
#include "base/command_line.h"
#include "base/metrics/field_trial_params.h"
#include "base/strings/strcat.h"
#include "base/strings/string_number_conversions.h"
#include "base/task/deferred_sequenced_task_runner.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/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 "media/media_buildflags.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "services/audio/public/cpp/audio_system_to_service_adapter.h"
#include "services/audio/public/mojom/audio_service.mojom.h"
#include "services/audio/service.h"
#include "services/audio/service_factory.h"
#if BUILDFLAG(ENABLE_PASSTHROUGH_AUDIO_CODECS)
#include "ui/display/util/edid_parser.h"
#if BUILDFLAG(IS_LINUX)
#include "ui/display/display_util.h"
#endif // BUILDFLAG(IS_LINUX)
#if BUILDFLAG(IS_WIN)
#include "ui/display/win/audio_edid_scan.h"
#endif // BUILDFLAG(IS_WIN)
#endif // BUILDFLAG(ENABLE_PASSTHROUGH_AUDIO_CODECS)
namespace content {
namespace {
audio::mojom::AudioService* g_service_override = nullptr;
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<media::mojom::AudioStreamFactory> 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;
#if BUILDFLAG(IS_CHROMEOS) && BUILDFLAG(USE_CRAS)
if (GetContentClient()->browser()->EnforceSystemAudioEchoCancellation()) {
base::CommandLine::ForCurrentProcess()->AppendSwitch(
switches::kSystemAecEnabled);
}
#endif // BUILDFLAG(IS_CHROMEOS) && BUILDFLAG(USE_CRAS)
// TODO(crbug.com/40580951): Remove
// BrowserMainLoop::GetAudioManager().
audio::Service::GetInProcessTaskRunner()->PostTask(
FROM_HERE,
base::BindOnce(
[](media::AudioManager* audio_manager,
mojo::PendingReceiver<audio::mojom::AudioService> receiver) {
static 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,
uint32_t codec_bitmask) {
std::vector<std::string> switches;
#if BUILDFLAG(IS_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.
switches.push_back(switches::kMessageLoopTypeUi);
#elif BUILDFLAG(IS_WIN)
if (GetContentClient()->browser()->ShouldEnableAudioProcessHighPriority())
switches.push_back(switches::kAudioProcessHighPriority);
#endif // BUILDFLAG(IS_WIN)
#if BUILDFLAG(ENABLE_PASSTHROUGH_AUDIO_CODECS)
switches.push_back(base::StrCat({switches::kAudioCodecsFromEDID, "=",
base::NumberToString(codec_bitmask)}));
#endif // BUILDFLAG(ENABLE_PASSTHROUGH_AUDIO_CODECS)
#if BUILDFLAG(IS_CHROMEOS) && BUILDFLAG(USE_CRAS)
if (GetContentClient()->browser()->EnforceSystemAudioEchoCancellation()) {
switches.push_back(switches::kSystemAecEnabled);
}
#endif // BUILDFLAG(IS_CHROMEOS) && BUILDFLAG(USE_CRAS)
ServiceProcessHost::Launch(
std::move(receiver),
ServiceProcessHost::Options()
.WithDisplayName("Audio Service")
.WithExtraCommandLineSwitches(std::move(switches))
.Pass());
}
void LaunchAudioService(
mojo::PendingReceiver<audio::mojom::AudioService> receiver,
uint32_t codec_bitmask) {
// The static storage slot in GetAudioService() prevents LaunchAudioService
// from being called more than once.
if (IsAudioServiceOutOfProcess()) {
LaunchAudioServiceOutOfProcess(std::move(receiver), codec_bitmask);
} else {
LaunchAudioServiceInProcess(std::move(receiver));
}
}
#if BUILDFLAG(ENABLE_PASSTHROUGH_AUDIO_CODECS)
// Convert the EDID supported audio bitstream formats into media codec bitmasks.
uint32_t ConvertEdidBitstreams(uint32_t formats) {
uint32_t codec_bitmask = 0;
if (formats & display::EdidParser::kAudioBitstreamPcmLinear)
codec_bitmask |= media::AudioParameters::AUDIO_PCM_LINEAR;
if (formats & display::EdidParser::kAudioBitstreamDts)
codec_bitmask |= media::AudioParameters::AUDIO_BITSTREAM_DTS;
if (formats & display::EdidParser::kAudioBitstreamDtsHd)
codec_bitmask |= media::AudioParameters::AUDIO_BITSTREAM_DTS_HD;
return codec_bitmask;
}
#if BUILDFLAG(IS_WIN)
// Convert the EDID supported audio bitstream formats into media codec bitmasks.
uint32_t ScanEdidBitstreams() {
return ConvertEdidBitstreams(display::win::ScanEdidBitstreams());
}
#endif // BUILDFLAG(IS_WIN)
#endif // BUILDFLAG(ENABLE_PASSTHROUGH_AUDIO_CODECS)
} // namespace
audio::mojom::AudioService& GetAudioService() {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
if (g_service_override) {
return *g_service_override;
}
// 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::SequenceLocalStorageSlot<
mojo::Remote<audio::mojom::AudioService>>
remote_slot;
auto& remote = remote_slot.GetOrCreateValue();
if (!remote) {
auto receiver = remote.BindNewPipeAndPassReceiver();
#if BUILDFLAG(ENABLE_PASSTHROUGH_AUDIO_CODECS) && BUILDFLAG(IS_WIN)
// The EDID scan is done in a COM STA thread and the result
// passed to the audio service launcher.
base::ThreadPool::CreateCOMSTATaskRunner(
{base::MayBlock(), base::TaskPriority::USER_BLOCKING,
base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN})
->PostTaskAndReplyWithResult(
FROM_HERE, base::BindOnce(&ScanEdidBitstreams),
base::BindOnce(&LaunchAudioService, std::move(receiver)));
#elif BUILDFLAG(ENABLE_PASSTHROUGH_AUDIO_CODECS) && BUILDFLAG(IS_LINUX)
LaunchAudioService(
std::move(receiver),
ConvertEdidBitstreams(display::DisplayUtil::GetAudioFormats()));
#else
LaunchAudioService(std::move(receiver), 0);
#endif // BUILDFLAG(ENABLE_PASSTHROUGH_AUDIO_CODECS) && BUILDFLAG(IS_WIN)
remote.reset_on_disconnect();
}
return *remote.get();
}
base::AutoReset<audio::mojom::AudioService*>
OverrideAudioServiceForTesting( // IN-TEST
audio::mojom::AudioService* service) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
return {&g_service_override, service};
}
std::unique_ptr<media::AudioSystem> CreateAudioSystemForAudioService() {
constexpr auto kServiceDisconnectTimeout = base::Seconds(1);
return std::make_unique<audio::AudioSystemToServiceAdapter>(
base::BindRepeating(&BindSystemInfoFromAnySequence),
kServiceDisconnectTimeout);
}
AudioServiceStreamFactoryBinder GetAudioServiceStreamFactoryBinder() {
return base::BindRepeating(&BindStreamFactoryFromAnySequence);
}
} // namespace content
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