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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/detection_observer.h"
#include <algorithm>
#include <cstddef>
#include <cstdint>
#include <utility>
#include <vector>
#include "base/check.h"
#include "base/check_op.h"
#include "base/feature_list.h"
#include "base/functional/bind.h"
#include "base/location.h"
#include "base/time/time.h"
#include "chromeos/ash/components/kiosk/vision/internal/detection_processor.h"
#include "media/capture/video/chromeos/mojom/cros_camera_service.mojom-forward.h"
namespace ash::kiosk_vision {
namespace {
int64_t CurrentTimestampInMicroseconds() {
return base::Time::Now().ToDeltaSinceWindowsEpoch().InMicroseconds();
}
bool IsSortedByTimestamp(
const std::vector<cros::mojom::KioskVisionAppearancePtr>& appearances) {
for (size_t i = 1; i < appearances.size(); i++) {
if (appearances[i - 1]->timestamp_in_us > appearances[i]->timestamp_in_us) {
return false;
}
}
return true;
}
void ValidateDetection(const cros::mojom::KioskVisionDetection& detection) {
bool face_or_body_are_present = std::ranges::all_of(
detection.appearances, [](auto& a) { return a->face || a->body; });
CHECK(face_or_body_are_present)
<< "Appearances must have either a face or body or both";
}
void ValidateTrack(const cros::mojom::KioskVisionTrack& track) {
CHECK(track.appearances.size() > 0)
<< "A track's list of appearances must not be empty";
bool is_same_person = std::ranges::all_of(
track.appearances,
[&](auto id) { return track.appearances[0]->person_id == id; },
[](const auto& a) { return a->person_id; });
CHECK(is_same_person) << "A track's appearances must all have the same id";
bool face_or_body_are_present = std::ranges::all_of(
track.appearances, [](auto& a) { return a->face || a->body; });
CHECK(face_or_body_are_present)
<< "Appearances must have either a face or body or both";
CHECK(track.start_timestamp_in_us <= track.end_timestamp_in_us)
<< "A track's start time must not be later than its end time";
CHECK(IsSortedByTimestamp(track.appearances))
<< "A track's appearances must be sorted by time";
}
} // namespace
BASE_FEATURE(kEmitKioskVisionFakes,
"EmitKioskVisionFakes",
base::FEATURE_DISABLED_BY_DEFAULT);
DetectionObserver::DetectionObserver(DetectionProcessors processors)
: processors_(std::move(processors)) {
CHECK_GT(processors_.size(), 0ul) << "No processors given";
if (base::FeatureList::IsEnabled(kEmitKioskVisionFakes)) {
constexpr base::TimeDelta kFakeEmissionPeriod = base::Seconds(5);
fake_detection_timer_.Start(
FROM_HERE, kFakeEmissionPeriod,
base::BindRepeating(&DetectionObserver::EmitFakeDetection,
base::Unretained(this)));
}
}
DetectionObserver::~DetectionObserver() = default;
void DetectionObserver::OnFrameProcessed(
cros::mojom::KioskVisionDetectionPtr detection) {
ValidateDetection(*detection);
for (const auto& processor : processors_) {
processor->OnFrameProcessed(*detection);
}
}
void DetectionObserver::OnTrackCompleted(
cros::mojom::KioskVisionTrackPtr track) {
ValidateTrack(*track);
for (const auto& processor : processors_) {
processor->OnTrackCompleted(*track);
}
}
void DetectionObserver::OnError(cros::mojom::KioskVisionError error) {
for (const auto& processor : processors_) {
processor->OnError(error);
}
}
void DetectionObserver::EmitFakeDetection() {
constexpr int kLargeCount = 3;
constexpr int kSmallCount = 2;
constexpr int kBoxesPerRow = 6;
constexpr int kMaxOffset = 20;
constexpr float kConfidence = 0.7;
constexpr float kRollFaceAngle = 10;
constexpr float kPanFaceAngle = 20;
constexpr float kTiltFaceAngle = 30;
constexpr float kLowAngle = 4;
// Makes 2 or 3 fake appearances depending on `fake_detection_flag_`.
auto fake_detection = cros::mojom::KioskVisionDetection::New();
for (int i = 0; i < (fake_detection_flag_ ? kLargeCount : kSmallCount); i++) {
int offset = fake_detection_offset_ + i;
auto fake_appearance = cros::mojom::KioskVisionAppearance::New(
/*timestamp_in_us=*/CurrentTimestampInMicroseconds(),
/*person_id=*/i,
/*face=*/
cros::mojom::KioskVisionFaceDetection::New(
/*confidence=*/kConfidence,
/*roll=*/kRollFaceAngle,
// Set low face angles for index 1. Useful to test the case when the
// person faces the device.
/*pan=*/i == 1 ? kLowAngle : kPanFaceAngle,
/*tilt=*/i == 1 ? kLowAngle : kTiltFaceAngle,
/*box=*/
cros::mojom::KioskVisionBoundingBox::New(
/*x=*/20 + 50 * (offset % kBoxesPerRow),
/*y=*/20 + 50 * (offset / kBoxesPerRow),
/*width=*/20,
/*height=*/20)),
/*body=*/
cros::mojom::KioskVisionBodyDetection::New(
/*confidence=*/kConfidence,
/*box=*/cros::mojom::KioskVisionBoundingBox::New(
/*x=*/10 + 50 * (offset % kBoxesPerRow),
/*y=*/20 + 50 * (offset / kBoxesPerRow),
/*width=*/40,
/*height=*/40)));
fake_detection->appearances.push_back(std::move(fake_appearance));
}
fake_detection_flag_ = !fake_detection_flag_;
fake_detection_offset_ = (fake_detection_offset_ + 1) % kMaxOffset;
OnFrameProcessed(std::move(fake_detection));
}
} // namespace ash::kiosk_vision
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