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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/media_effects/media_effects_service.h"
#include <optional>
#include "base/files/file_util.h"
#include "base/functional/bind.h"
#include "base/functional/callback_helpers.h"
#include "base/sequence_checker.h"
#include "base/task/sequenced_task_runner.h"
#include "base/task/task_traits.h"
#include "base/task/thread_pool.h"
#include "content/public/browser/browser_thread.h"
#include "media/capture/mojom/video_effects_manager.mojom.h"
#include "mojo/public/cpp/bindings/pending_remote.h"
#include "services/video_effects/public/cpp/buildflags.h"
#if BUILDFLAG(ENABLE_VIDEO_EFFECTS)
#include "components/media_effects/media_effects_model_provider.h"
#include "content/public/browser/gpu_client.h"
#include "services/video_effects/public/cpp/video_effects_service_host.h"
#include "services/video_effects/public/mojom/video_effects_processor.mojom.h"
#include "services/video_effects/public/mojom/video_effects_service.mojom.h"
#endif
#if BUILDFLAG(ENABLE_VIDEO_EFFECTS)
MediaEffectsService::MediaEffectsService(
PrefService* prefs,
std::unique_ptr<MediaEffectsModelProvider> model_provider)
: prefs_(prefs),
model_provider_(std::move(model_provider)),
gpu_client_(nullptr, base::OnTaskRunnerDeleter(nullptr)) {
if (model_provider_) {
model_provider_->AddObserver(this);
}
}
#endif
MediaEffectsService::MediaEffectsService(PrefService* prefs) : prefs_(prefs) {}
MediaEffectsService::~MediaEffectsService() {
#if BUILDFLAG(ENABLE_VIDEO_EFFECTS)
if (model_provider_) {
model_provider_->RemoveObserver(this);
}
if (latest_segmentation_model_file_.IsValid()) {
// Closing a file is considered blocking, schedule it in a context where
// blocking is allowed:
base::ThreadPool::PostTask(FROM_HERE, {base::MayBlock()},
base::DoNothingWithBoundArgs(
std::move(latest_segmentation_model_file_)));
}
#endif
}
void MediaEffectsService::BindReadonlyVideoEffectsManager(
const std::string& device_id,
mojo::PendingReceiver<media::mojom::ReadonlyVideoEffectsManager>
effects_manager_receiver) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
auto& effects_manager = GetOrCreateVideoEffectsManager(device_id);
effects_manager.Bind(std::move(effects_manager_receiver));
}
#if BUILDFLAG(ENABLE_VIDEO_EFFECTS)
void MediaEffectsService::BindVideoEffectsProcessor(
const std::string& device_id,
mojo::PendingReceiver<video_effects::mojom::VideoEffectsProcessor>
effects_processor_receiver) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
mojo::PendingRemote<media::mojom::ReadonlyVideoEffectsManager>
readonly_video_effects_manager;
BindReadonlyVideoEffectsManager(
device_id,
readonly_video_effects_manager.InitWithNewPipeAndPassReceiver());
auto* video_effects_service = video_effects::GetVideoEffectsService();
CHECK(video_effects_service);
// The `video_effects_service` is reset if it is idle for more than 5 seconds.
// Re-send the model in case that has happened.
if (latest_segmentation_model_file_.IsValid()) {
video_effects_service->SetBackgroundSegmentationModel(
latest_segmentation_model_file_.Duplicate());
}
mojo::PendingRemote<viz::mojom::Gpu> gpu_remote;
mojo::PendingReceiver<viz::mojom::Gpu> gpu_receiver =
gpu_remote.InitWithNewPipeAndPassReceiver();
if (!gpu_client_) {
gpu_client_ = content::CreateGpuClient(std::move(gpu_receiver));
} else {
auto task_runner = content::GetUIThreadTaskRunner({});
task_runner->PostTask(FROM_HERE, base::BindOnce(&viz::GpuClient::Add,
gpu_client_->GetWeakPtr(),
std::move(gpu_receiver)));
}
video_effects_service->CreateEffectsProcessor(
device_id, std::move(gpu_remote),
std::move(readonly_video_effects_manager),
std::move(effects_processor_receiver));
}
void MediaEffectsService::OnBackgroundSegmentationModelUpdated(
base::optional_ref<const base::FilePath> path) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (!path.has_value()) {
// We have not received a valid path, so there is nothing to open.
// Just pass an invalid `base::File`, it will be handled by lower
// layers.
OnBackgroundSegmentationModelOpened(base::File());
return;
}
// We have received new path to the model, let's open it and inform the Video
// Effects Service about it. Opening a file is considered blocking, schedule
// it in a context where blocking is allowed:
base::ThreadPool::PostTaskAndReplyWithResult(
FROM_HERE, {base::MayBlock()},
base::BindOnce(
[](const base::FilePath& model_path) {
if (!base::PathExists(model_path)) {
return base::File();
}
base::File model(model_path, base::File::Flags::FLAG_OPEN |
base::File::Flags::FLAG_READ);
return model;
},
*path),
base::BindOnce(&MediaEffectsService::OnBackgroundSegmentationModelOpened,
weak_factory_.GetWeakPtr()));
}
void MediaEffectsService::OnBackgroundSegmentationModelOpened(
base::File model_file) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
video_effects::GetVideoEffectsService()->SetBackgroundSegmentationModel(
model_file.Duplicate());
// Swap newly opened file with the old one and then close the old one:
std::swap(latest_segmentation_model_file_, model_file);
// Closing a file is considered blocking, schedule it in a context where
// blocking is allowed:
if (model_file.IsValid()) {
base::ThreadPool::PostTask(
FROM_HERE, {base::MayBlock()},
base::DoNothingWithBoundArgs(std::move(model_file)));
}
}
#endif
VideoEffectsManagerImpl& MediaEffectsService::GetOrCreateVideoEffectsManager(
const std::string& device_id) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (auto effects_manager = video_effects_managers_.find(device_id);
effects_manager != video_effects_managers_.end()) {
return *effects_manager->second;
}
// base::Unretained is safe here because `this` owns the
// `VideoEffectsManagerImpl` that would call this callback.
auto [effects_manager, inserted] = video_effects_managers_.emplace(
device_id,
std::make_unique<VideoEffectsManagerImpl>(
prefs_,
base::BindOnce(&MediaEffectsService::OnLastReceiverDisconnected,
base::Unretained(this), device_id)));
CHECK(inserted);
return *effects_manager->second;
}
void MediaEffectsService::OnLastReceiverDisconnected(
const std::string& device_id) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
video_effects_managers_.erase(device_id);
}
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