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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chromeos/ash/components/kiosk/vision/internal/camera_service_connector.h"
#include <cstdlib>
#include <memory>
#include <optional>
#include <string>
#include <utility>
#include <vector>
#include "base/check.h"
#include "base/check_deref.h"
#include "base/functional/bind.h"
#include "base/functional/callback_helpers.h"
#include "base/logging.h"
#include "base/memory/scoped_refptr.h"
#include "chromeos/ash/components/mojo_service_manager/connection.h"
#include "components/capture_mode/camera_video_frame_handler.h"
#include "content/public/browser/context_factory.h"
#include "content/public/browser/video_capture_service.h"
#include "media/base/video_frame.h"
#include "media/capture/video/chromeos/mojom/cros_camera_service.mojom-forward.h"
#include "media/capture/video/chromeos/mojom/cros_camera_service.mojom.h"
#include "media/capture/video/video_capture_device_info.h"
#include "media/capture/video_capture_types.h"
#include "mojo/public/cpp/bindings/pending_remote.h"
#include "mojo/public/cpp/bindings/receiver.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "services/video_capture/public/mojom/video_capture_service.mojom.h"
#include "services/video_capture/public/mojom/video_source.mojom.h"
#include "third_party/cros_system_api/mojo/service_constants.h"
namespace ash::kiosk_vision {
namespace {
mojo::Remote<cros::mojom::CrosCameraService> BindCameraServiceRemote() {
mojo::Remote<cros::mojom::CrosCameraService> remote;
ash::mojo_service_manager::GetServiceManagerProxy()->Request(
chromeos::mojo_services::kCrosCameraService, /*timeout=*/std::nullopt,
remote.BindNewPipeAndPassReceiver().PassPipe());
return remote;
}
bool IsAcceptableFormat(media::VideoCaptureFormat format) {
return (format.frame_rate >= kMinimumFrameRate) &&
(format.frame_size.width() >= kRequestedFormatWidth) &&
(format.frame_size.height() >= kRequestedFormatHeight);
}
bool IsCloserValue(int new_value, int current_value, int target) {
return std::abs(new_value - target) < std::abs(current_value - target);
}
bool IsBetterFormat(media::VideoCaptureFormat new_format,
media::VideoCaptureFormat current_format) {
if (!IsAcceptableFormat(new_format)) {
return false;
}
if (new_format.frame_size.width() != current_format.frame_size.width()) {
return IsCloserValue(new_format.frame_size.width(),
current_format.frame_size.width(),
kRequestedFormatWidth);
}
return IsCloserValue(new_format.frame_size.height(),
current_format.frame_size.height(),
kRequestedFormatHeight);
}
media::VideoCaptureFormat GetClosestVideoFormat(
media::VideoCaptureFormats supported_formats) {
media::VideoCaptureFormat best_format = supported_formats[0];
for (auto format : supported_formats) {
if (IsBetterFormat(format, best_format)) {
best_format = format;
}
}
return best_format;
}
} // namespace
CameraServiceConnector::CameraServiceConnector(
const std::string& dlc_path,
cros::mojom::KioskVisionObserver* observer)
: dlc_path_(dlc_path),
receiver_(observer),
camera_service_(BindCameraServiceRemote()) {}
CameraServiceConnector::~CameraServiceConnector() {
if (video_frame_handler_) {
// Close frame handling and move the object to another thread to allow it
// to finish processing frames that are in progress. If this isn't done,
// then allocated buffers can be left dangling until the video stream is
// stopped.
auto* handler_ptr = video_frame_handler_.get();
std::exchange(handler_ptr, nullptr)
->Close(base::DoNothingWithBoundArgs(
std::move(video_source_provider_remote_),
std::move(video_frame_handler_)));
}
}
void CameraServiceConnector::Start() {
status_ = Status::kStarted;
StartKioskVisionDetection();
ReconnectToVideoSourceProvider();
}
void CameraServiceConnector::OnCameraVideoFrame(
scoped_refptr<media::VideoFrame> frame) {
// We do not use the frames, this function is required to start the video
// stream.
}
void CameraServiceConnector::OnFatalErrorOrDisconnection() {
status_ = Status::kFatalErrorOrDisconnection;
LOG(ERROR) << "Fatal error occurred during the camera video streaming";
video_frame_handler_.reset();
}
void CameraServiceConnector::ReconnectToVideoSourceProvider() {
video_source_provider_remote_.reset();
content::GetVideoCaptureService().ConnectToVideoSourceProvider(
video_source_provider_remote_.BindNewPipeAndPassReceiver());
video_source_provider_remote_.set_disconnect_handler(
base::BindOnce(&CameraServiceConnector::ReconnectToVideoSourceProvider,
base::Unretained(this)));
GetCameraDevices();
}
void CameraServiceConnector::GetCameraDevices() {
CHECK(video_source_provider_remote_);
video_source_provider_remote_->GetSourceInfos(
base::BindOnce(&CameraServiceConnector::OnCameraDevicesReceived,
weak_ptr_factory_.GetWeakPtr()));
}
void CameraServiceConnector::OnCameraDevicesReceived(
video_capture::mojom::VideoSourceProvider::GetSourceInfosResult,
const std::vector<media::VideoCaptureDeviceInfo>& devices) {
if (devices.empty()) {
// TODO(b/339399663): report this error to telemetry API.
status_ = Status::kCameraNotConnected;
LOG(ERROR) << "Camera is not connected.";
return;
}
media::VideoCaptureDeviceInfo selected_camera = devices[0];
std::string device_id = selected_camera.descriptor.device_id;
mojo::Remote<video_capture::mojom::VideoSource> camera_video_source;
video_source_provider_remote_->GetVideoSource(
device_id, camera_video_source.BindNewPipeAndPassReceiver());
if (selected_camera.supported_formats.empty()) {
status_ = Status::kCameraHasNoSupportedFormats;
return;
}
media::VideoCaptureFormat video_format =
GetClosestVideoFormat(selected_camera.supported_formats);
video_frame_handler_ =
std::make_unique<capture_mode::CameraVideoFrameHandler>(
content::GetContextFactory(), std::move(camera_video_source),
video_format, device_id);
video_frame_handler_->StartHandlingFrames(/*delegate=*/this);
status_ = Status::kVideoStreamStarted;
}
void CameraServiceConnector::StartKioskVisionDetection() {
// TODO(b/335458462) Camera service runs in a separate process and a
// disconnect may happen when it crashes. Implement a reconnect strategy. Note
// that `ReconnectToVideoSourceProvider` will be triggered only if the video
// stream was stopped, but we need to handle mojom disconnections here.
camera_service_.reset_on_disconnect();
camera_service_->StartKioskVisionDetection(
dlc_path_, receiver_.BindNewPipeAndPassRemote());
}
} // namespace ash::kiosk_vision
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