Add EvsCamera Class and Buffer Manipulation
Test: Build and `atest android.hardware.automotive.evs-aidl-default-service_cam_buffer_test`
Bug: 277861838
Change-Id: I28218f8e22e7daca3d8ce0bbec64c054a4462564
diff --git a/automotive/evs/aidl/impl/default/Android.bp b/automotive/evs/aidl/impl/default/Android.bp
index 79ee956..c56fe2b 100644
--- a/automotive/evs/aidl/impl/default/Android.bp
+++ b/automotive/evs/aidl/impl/default/Android.bp
@@ -21,45 +21,41 @@
default_applicable_licenses: ["hardware_interfaces_license"],
}
-cc_binary {
- name: "android.hardware.automotive.evs-aidl-default-service",
+cc_defaults {
+ name: "android.hardware.automotive.evs-aidl-default-service-default",
defaults: ["EvsHalDefaults"],
- vintf_fragments: ["manifest_evs-default-service.xml"],
- init_rc: ["evs-default-service.rc"],
- vendor: true,
- relative_install_path: "hw",
- cflags: [
- "-DGL_GLEXT_PROTOTYPES",
- "-DEGL_EGLEXT_PROTOTYPES",
- "-Wall",
- "-Wextra",
- "-Werror",
- "-Wthread-safety",
- ],
- srcs: [
- ":libgui_frame_event_aidl",
- "src/*.cpp",
- ],
shared_libs: [
"android.hardware.graphics.bufferqueue@1.0",
"android.hardware.graphics.bufferqueue@2.0",
"android.hidl.token@1.0-utils",
"libEGL",
"libGLESv2",
- "libbase",
"libbinder_ndk",
"libbufferqueueconverter",
"libcamera_metadata",
"libhardware_legacy",
"libhidlbase",
- "liblog",
"libnativewindow",
"libtinyxml2",
"libui",
- "libutils",
"libyuv",
],
- static_libs: [
+}
+
+cc_library {
+ name: "android.hardware.automotive.evs-aidl-default-service-lib",
+ defaults: ["android.hardware.automotive.evs-aidl-default-service-default"],
+ vendor: true,
+ cflags: [
+ "-DGL_GLEXT_PROTOTYPES",
+ "-DEGL_EGLEXT_PROTOTYPES",
+ ],
+ srcs: [
+ ":libgui_frame_event_aidl",
+ "src/*.cpp",
+ ],
+ exclude_srcs: ["src/service.cpp"],
+ whole_static_libs: [
"android.frameworks.automotive.display-V2-ndk",
"android.hardware.automotive.evs-V2-ndk",
"android.hardware.common-V2-ndk",
@@ -71,6 +67,25 @@
],
local_include_dirs: ["include"],
include_dirs: ["frameworks/native/include/"],
+ export_include_dirs: ["include"],
+}
+
+cc_binary {
+ name: "android.hardware.automotive.evs-aidl-default-service",
+ defaults: ["android.hardware.automotive.evs-aidl-default-service-default"],
+ vintf_fragments: ["manifest_evs-default-service.xml"],
+ init_rc: ["evs-default-service.rc"],
+ vendor: true,
+ relative_install_path: "hw",
+ cflags: [
+ "-DGL_GLEXT_PROTOTYPES",
+ "-DEGL_EGLEXT_PROTOTYPES",
+ ],
+ srcs: ["src/service.cpp"],
+ static_libs: [
+ "android.hardware.automotive.evs-aidl-default-service-lib",
+ ],
+ include_dirs: ["frameworks/native/include/"],
required: ["evs_mock_hal_configuration.xml"],
}
@@ -80,3 +95,14 @@
src: "resources/evs_mock_configuration.xml",
sub_dir: "automotive/evs",
}
+
+cc_test {
+ name: "android.hardware.automotive.evs-aidl-default-service_cam_buffer_test",
+ defaults: ["android.hardware.automotive.evs-aidl-default-service-default"],
+ vendor: true,
+ srcs: ["tests/EvsCameraBufferTest.cpp"],
+ static_libs: [
+ "android.hardware.automotive.evs-aidl-default-service-lib",
+ "libgmock",
+ ],
+}
diff --git a/automotive/evs/aidl/impl/default/include/EvsCamera.h b/automotive/evs/aidl/impl/default/include/EvsCamera.h
new file mode 100644
index 0000000..3663e3d
--- /dev/null
+++ b/automotive/evs/aidl/impl/default/include/EvsCamera.h
@@ -0,0 +1,98 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "EvsCameraBase.h"
+
+#include <cutils/native_handle.h>
+
+#include <cstddef>
+#include <mutex>
+#include <utility>
+#include <vector>
+
+namespace aidl::android::hardware::automotive::evs::implementation {
+
+class EvsCamera : public EvsCameraBase {
+ private:
+ using Base = EvsCameraBase;
+ using Self = EvsCamera;
+
+ public:
+ using Base::Base;
+
+ ~EvsCamera() override;
+
+ // Methods from ::android::hardware::automotive::evs::IEvsCamera follow.
+ ndk::ScopedAStatus doneWithFrame(const std::vector<evs::BufferDesc>& buffers) override;
+
+ ndk::ScopedAStatus importExternalBuffers(const std::vector<evs::BufferDesc>& buffers,
+ int32_t* _aidl_return) override;
+
+ ndk::ScopedAStatus setMaxFramesInFlight(int32_t bufferCount) override;
+
+ protected:
+ virtual ::android::status_t allocateOneFrame(buffer_handle_t* handle) = 0;
+
+ virtual void freeOneFrame(const buffer_handle_t handle);
+
+ void shutdown() override;
+
+ void closeAllBuffers_unsafe();
+
+ // Returns (ID, handle) if succeeds. (static_cast<size_t>(-1), nullptr) otherwise.
+ [[nodiscard]] std::pair<std::size_t, buffer_handle_t> useBuffer_unsafe();
+
+ void returnBuffer_unsafe(const std::size_t id);
+
+ bool increaseAvailableFrames_unsafe(const buffer_handle_t handle);
+
+ bool decreaseAvailableFrames_unsafe();
+
+ bool setAvailableFrames_unsafe(const std::size_t bufferCount);
+
+ void swapBufferFrames_unsafe(const std::size_t pos1, const std::size_t pos2);
+
+ struct BufferRecord {
+ BufferRecord() = default;
+ BufferRecord(const BufferRecord&) = default;
+ BufferRecord(BufferRecord&&) = default;
+ BufferRecord& operator=(const BufferRecord&) = default;
+ BufferRecord& operator=(BufferRecord&&) = default;
+ ~BufferRecord() = default;
+
+ explicit BufferRecord(buffer_handle_t h) : handle(h) {}
+
+ buffer_handle_t handle{nullptr};
+ bool inUse{false};
+ };
+
+ std::mutex mMutex;
+
+ // Graphics buffers to transfer images, always in the order of:
+ // In use buffers ... available buffers ... unavailable (unallocated) buffers.
+ std::vector<BufferRecord> mBuffers;
+
+ // Double-mapping between buffer position and ID.
+ std::vector<std::size_t> mBufferPosToId;
+ std::vector<std::size_t> mBufferIdToPos;
+
+ std::size_t mAvailableFrames{0};
+ std::size_t mFramesInUse{0};
+};
+
+} // namespace aidl::android::hardware::automotive::evs::implementation
diff --git a/automotive/evs/aidl/impl/default/src/EvsCamera.cpp b/automotive/evs/aidl/impl/default/src/EvsCamera.cpp
new file mode 100644
index 0000000..db3be8f
--- /dev/null
+++ b/automotive/evs/aidl/impl/default/src/EvsCamera.cpp
@@ -0,0 +1,266 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "EvsCamera.h"
+
+#include <aidl/android/hardware/automotive/evs/EvsResult.h>
+#include <aidlcommonsupport/NativeHandle.h>
+#include <android-base/logging.h>
+#include <android/hardware_buffer.h>
+#include <ui/GraphicBufferAllocator.h>
+#include <ui/GraphicBufferMapper.h>
+
+#include <cstddef>
+#include <mutex>
+
+namespace aidl::android::hardware::automotive::evs::implementation {
+
+// Arbitrary limit on number of graphics buffers allowed to be allocated
+// Safeguards against unreasonable resource consumption and provides a testable limit
+constexpr std::size_t kMaxBuffersInFlight = 100;
+
+EvsCamera::~EvsCamera() {
+ shutdown();
+}
+
+ndk::ScopedAStatus EvsCamera::doneWithFrame(const std::vector<evs::BufferDesc>& buffers) {
+ std::lock_guard lck(mMutex);
+ for (const auto& desc : buffers) {
+ returnBuffer_unsafe(desc.bufferId);
+ }
+ return ndk::ScopedAStatus::ok();
+}
+
+ndk::ScopedAStatus EvsCamera::importExternalBuffers(const std::vector<evs::BufferDesc>& buffers,
+ int32_t* _aidl_return) {
+ if (buffers.empty()) {
+ LOG(DEBUG) << __func__
+ << ": Ignoring a request to import external buffers with an empty list.";
+ return ndk::ScopedAStatus::ok();
+ }
+ static auto& mapper = ::android::GraphicBufferMapper::get();
+ std::lock_guard lck(mMutex);
+ std::size_t numBuffersToAdd = std::min(buffers.size(), kMaxBuffersInFlight - mAvailableFrames);
+ if (numBuffersToAdd == 0) {
+ LOG(WARNING) << __func__ << ": The number of buffers has hit the upper limit ("
+ << kMaxBuffersInFlight << "). Stop importing.";
+ return ndk::ScopedAStatus::ok();
+ } else if (numBuffersToAdd < buffers.size()) {
+ LOG(WARNING) << "Exceeds the limit on the number of buffers. Only " << numBuffersToAdd
+ << " buffers will be imported. " << buffers.size() << " are asked.";
+ }
+ const size_t before = mAvailableFrames;
+ for (std::size_t idx = 0; idx < numBuffersToAdd; ++idx) {
+ auto& buffer = buffers[idx];
+ const AHardwareBuffer_Desc* pDesc =
+ reinterpret_cast<const AHardwareBuffer_Desc*>(&buffer.buffer.description);
+
+ buffer_handle_t handleToImport = ::android::dupFromAidl(buffer.buffer.handle);
+ buffer_handle_t handleToStore = nullptr;
+ if (handleToImport == nullptr) {
+ LOG(WARNING) << "Failed to duplicate a memory handle. Ignoring a buffer "
+ << buffer.bufferId;
+ continue;
+ }
+
+ ::android::status_t result =
+ mapper.importBuffer(handleToImport, pDesc->width, pDesc->height, pDesc->layers,
+ pDesc->format, pDesc->usage, pDesc->stride, &handleToStore);
+ if (result != ::android::NO_ERROR || handleToStore == nullptr ||
+ !increaseAvailableFrames_unsafe(handleToStore)) {
+ LOG(WARNING) << "Failed to import a buffer " << buffer.bufferId;
+ }
+ }
+ *_aidl_return = mAvailableFrames - before;
+ return ndk::ScopedAStatus::ok();
+}
+
+ndk::ScopedAStatus EvsCamera::setMaxFramesInFlight(int32_t bufferCount) {
+ std::lock_guard lock(mMutex);
+ if (bufferCount < 1) {
+ LOG(ERROR) << "Ignoring setMaxFramesInFlight with less than one buffer requested.";
+ return ndk::ScopedAStatus::fromServiceSpecificError(
+ static_cast<int>(EvsResult::INVALID_ARG));
+ }
+ if (!setAvailableFrames_unsafe(bufferCount)) {
+ LOG(ERROR) << "Failed to adjust the maximum number of frames in flight.";
+ return ndk::ScopedAStatus::fromServiceSpecificError(
+ static_cast<int>(EvsResult::BUFFER_NOT_AVAILABLE));
+ }
+ return ndk::ScopedAStatus::ok();
+}
+
+void EvsCamera::freeOneFrame(const buffer_handle_t handle) {
+ static auto& alloc = ::android::GraphicBufferAllocator::get();
+ alloc.free(handle);
+}
+
+bool EvsCamera::setAvailableFrames_unsafe(const std::size_t bufferCount) {
+ if (bufferCount < 1) {
+ LOG(ERROR) << "Ignoring request to set buffer count to zero.";
+ return false;
+ }
+ if (bufferCount > kMaxBuffersInFlight) {
+ LOG(ERROR) << "Rejecting buffer request in excess of internal limit";
+ return false;
+ }
+
+ if (bufferCount > mAvailableFrames) {
+ bool success = true;
+ const std::size_t numBufferBeforeAlloc = mAvailableFrames;
+ for (int numBufferToAllocate = bufferCount - mAvailableFrames;
+ success && numBufferToAllocate > 0; --numBufferToAllocate) {
+ buffer_handle_t handle = nullptr;
+ const auto result = allocateOneFrame(&handle);
+ if (result != ::android::NO_ERROR || !handle) {
+ LOG(ERROR) << __func__ << ": Failed to allocate a graphics buffer. Error " << result
+ << ", handle: " << handle;
+ success = false;
+ break;
+ }
+ success &= increaseAvailableFrames_unsafe(handle);
+ }
+ if (!success) {
+ // Rollback when failure.
+ for (int numBufferToRelease = mAvailableFrames - numBufferBeforeAlloc;
+ numBufferToRelease > 0; --numBufferToRelease) {
+ decreaseAvailableFrames_unsafe();
+ }
+ return false;
+ }
+ } else {
+ for (int numBufferToRelease = mAvailableFrames - std::max(bufferCount, mFramesInUse);
+ numBufferToRelease > 0; --numBufferToRelease) {
+ decreaseAvailableFrames_unsafe();
+ }
+ if (mAvailableFrames > bufferCount) {
+ // This shouldn't happen with a properly behaving client because the client
+ // should only make this call after returning sufficient outstanding buffers
+ // to allow a clean resize.
+ LOG(ERROR) << "Buffer queue shrink failed, asked: " << bufferCount
+ << ", actual: " << mAvailableFrames
+ << " -- too many buffers currently in use?";
+ }
+ }
+ return true;
+}
+
+void EvsCamera::shutdown() {
+ std::lock_guard lck(mMutex);
+ closeAllBuffers_unsafe();
+}
+
+void EvsCamera::closeAllBuffers_unsafe() {
+ if (mFramesInUse > 0) {
+ LOG(WARNING) << __func__ << ": Closing while " << mFramesInUse
+ << " frame(s) are still in use.";
+ }
+ for (auto& buffer : mBuffers) {
+ freeOneFrame(buffer.handle);
+ buffer.handle = nullptr;
+ }
+ mBuffers.clear();
+ mBufferPosToId.clear();
+ mBufferIdToPos.clear();
+}
+
+std::pair<std::size_t, buffer_handle_t> EvsCamera::useBuffer_unsafe() {
+ if (mFramesInUse >= mAvailableFrames) {
+ DCHECK_EQ(mFramesInUse, mAvailableFrames);
+ return {static_cast<std::size_t>(-1), nullptr};
+ }
+ const std::size_t pos = mFramesInUse++;
+ auto& buffer = mBuffers[pos];
+ DCHECK(!buffer.inUse);
+ DCHECK(buffer.handle);
+ buffer.inUse = true;
+ return {mBufferPosToId[pos], buffer.handle};
+}
+
+void EvsCamera::returnBuffer_unsafe(const std::size_t id) {
+ if (id >= mBuffers.size()) {
+ LOG(ERROR) << __func__ << ": ID out-of-bound. id: " << id
+ << " max: " << mBuffers.size() - 1;
+ return;
+ }
+ const std::size_t pos = mBufferIdToPos[id];
+
+ if (!mBuffers[pos].inUse) {
+ LOG(ERROR) << __func__ << ": Ignoring returning frame " << id << " which is already free.";
+ return;
+ }
+ DCHECK_LT(pos, mFramesInUse);
+ const std::size_t last_in_use_pos = --mFramesInUse;
+ swapBufferFrames_unsafe(pos, last_in_use_pos);
+ mBuffers[last_in_use_pos].inUse = false;
+}
+
+bool EvsCamera::increaseAvailableFrames_unsafe(const buffer_handle_t handle) {
+ if (mAvailableFrames >= kMaxBuffersInFlight) {
+ LOG(WARNING) << __func__ << ": The number of buffers has hit the upper limit ("
+ << kMaxBuffersInFlight << "). Stop increasing.";
+ return false;
+ }
+ const std::size_t pos = mAvailableFrames++;
+ if (mAvailableFrames > mBuffers.size()) {
+ const std::size_t oldBufferSize = mBuffers.size();
+ mBuffers.resize(mAvailableFrames);
+ mBufferPosToId.resize(mAvailableFrames);
+ mBufferIdToPos.resize(mAvailableFrames);
+ // Build position/ID mapping.
+ for (std::size_t idx = oldBufferSize; idx < mBuffers.size(); ++idx) {
+ mBufferPosToId[idx] = idx;
+ mBufferIdToPos[idx] = idx;
+ }
+ }
+ auto& buffer = mBuffers[pos];
+ DCHECK(!buffer.inUse);
+ DCHECK(!buffer.handle);
+ buffer.handle = handle;
+ return true;
+}
+
+bool EvsCamera::decreaseAvailableFrames_unsafe() {
+ if (mFramesInUse >= mAvailableFrames) {
+ DCHECK_EQ(mFramesInUse, mAvailableFrames);
+ return false;
+ }
+ const std::size_t pos = --mAvailableFrames;
+ auto& buffer = mBuffers[pos];
+ DCHECK(!buffer.inUse);
+ DCHECK(buffer.handle);
+ freeOneFrame(buffer.handle);
+ buffer.handle = nullptr;
+ return true;
+}
+
+void EvsCamera::swapBufferFrames_unsafe(const std::size_t pos1, const std::size_t pos2) {
+ if (pos1 == pos2) {
+ return;
+ }
+ if (pos1 >= mBuffers.size() || pos2 >= mBuffers.size()) {
+ LOG(ERROR) << __func__ << ": Index out-of-bound. pos1: " << pos1 << ", pos2: " << pos2
+ << ", buffer size: " << mBuffers.size();
+ return;
+ }
+ const std::size_t id1 = mBufferPosToId[pos1];
+ const std::size_t id2 = mBufferPosToId[pos2];
+ std::swap(mBufferPosToId[pos1], mBufferPosToId[pos2]);
+ std::swap(mBufferIdToPos[id1], mBufferIdToPos[id2]);
+ std::swap(mBuffers[pos1], mBuffers[pos2]);
+}
+
+} // namespace aidl::android::hardware::automotive::evs::implementation
diff --git a/automotive/evs/aidl/impl/default/tests/EvsCameraBufferTest.cpp b/automotive/evs/aidl/impl/default/tests/EvsCameraBufferTest.cpp
new file mode 100644
index 0000000..48f0890
--- /dev/null
+++ b/automotive/evs/aidl/impl/default/tests/EvsCameraBufferTest.cpp
@@ -0,0 +1,208 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "EvsCamera.h"
+
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+#include <cstdint>
+#include <unordered_set>
+#include <vector>
+
+namespace aidl::android::hardware::automotive::evs::implementation {
+
+class EvsCameraForTest : public EvsCamera {
+ public:
+ using EvsCamera::increaseAvailableFrames_unsafe;
+ using EvsCamera::returnBuffer_unsafe;
+ using EvsCamera::useBuffer_unsafe;
+
+ ~EvsCameraForTest() override { shutdown(); }
+
+ ::android::status_t allocateOneFrame(buffer_handle_t* handle) override {
+ static std::intptr_t handle_cnt = 0;
+ *handle = reinterpret_cast<buffer_handle_t>(++handle_cnt);
+ return ::android::OK;
+ }
+
+ void freeOneFrame(const buffer_handle_t /* handle */) override {
+ // Nothing to free because the handles are fake.
+ }
+
+ void checkBufferOrder() {
+ for (std::size_t idx = 0; idx < mBuffers.size(); ++idx) {
+ const auto& buffer = mBuffers[idx];
+ EXPECT_EQ(idx < mFramesInUse, buffer.inUse);
+ EXPECT_EQ(idx < mAvailableFrames, buffer.handle != nullptr);
+ EXPECT_LE(mFramesInUse, mAvailableFrames);
+ }
+ }
+
+ MOCK_METHOD(::ndk::ScopedAStatus, forcePrimaryClient,
+ (const std::shared_ptr<::aidl::android::hardware::automotive::evs::IEvsDisplay>&
+ in_display),
+ (override));
+ MOCK_METHOD(::ndk::ScopedAStatus, getCameraInfo,
+ (::aidl::android::hardware::automotive::evs::CameraDesc * _aidl_return),
+ (override));
+ MOCK_METHOD(::ndk::ScopedAStatus, getExtendedInfo,
+ (int32_t in_opaqueIdentifier, std::vector<uint8_t>* _aidl_return), (override));
+ MOCK_METHOD(::ndk::ScopedAStatus, getIntParameter,
+ (::aidl::android::hardware::automotive::evs::CameraParam in_id,
+ std::vector<int32_t>* _aidl_return),
+ (override));
+ MOCK_METHOD(::ndk::ScopedAStatus, getIntParameterRange,
+ (::aidl::android::hardware::automotive::evs::CameraParam in_id,
+ ::aidl::android::hardware::automotive::evs::ParameterRange* _aidl_return),
+ (override));
+ MOCK_METHOD(::ndk::ScopedAStatus, getParameterList,
+ (std::vector<::aidl::android::hardware::automotive::evs::CameraParam> *
+ _aidl_return),
+ (override));
+ MOCK_METHOD(::ndk::ScopedAStatus, getPhysicalCameraInfo,
+ (const std::string& in_deviceId,
+ ::aidl::android::hardware::automotive::evs::CameraDesc* _aidl_return),
+ (override));
+ MOCK_METHOD(::ndk::ScopedAStatus, pauseVideoStream, (), (override));
+ MOCK_METHOD(::ndk::ScopedAStatus, resumeVideoStream, (), (override));
+ MOCK_METHOD(::ndk::ScopedAStatus, setExtendedInfo,
+ (int32_t in_opaqueIdentifier, const std::vector<uint8_t>& in_opaqueValue),
+ (override));
+ MOCK_METHOD(::ndk::ScopedAStatus, setIntParameter,
+ (::aidl::android::hardware::automotive::evs::CameraParam in_id, int32_t in_value,
+ std::vector<int32_t>* _aidl_return),
+ (override));
+ MOCK_METHOD(::ndk::ScopedAStatus, setPrimaryClient, (), (override));
+ MOCK_METHOD(::ndk::ScopedAStatus, startVideoStream,
+ (const std::shared_ptr<
+ ::aidl::android::hardware::automotive::evs::IEvsCameraStream>& in_receiver),
+ (override));
+ MOCK_METHOD(::ndk::ScopedAStatus, stopVideoStream, (), (override));
+ MOCK_METHOD(::ndk::ScopedAStatus, unsetPrimaryClient, (), (override));
+};
+
+TEST(EvsCameraBufferTest, ChangeBufferPoolSize) {
+ auto evsCam = ndk::SharedRefBase::make<EvsCameraForTest>();
+ EXPECT_TRUE(evsCam->setMaxFramesInFlight(100).isOk());
+ evsCam->checkBufferOrder();
+ EXPECT_TRUE(evsCam->setMaxFramesInFlight(50).isOk());
+ evsCam->checkBufferOrder();
+
+ // 2 buffers in use.
+ const auto [id1, handle1] = evsCam->useBuffer_unsafe();
+ const auto [id2, handle2] = evsCam->useBuffer_unsafe();
+ std::ignore = evsCam->useBuffer_unsafe();
+
+ // It allows you to set the buffer pool size to 1, but it will keep the space for the in use
+ // buffers.
+ EXPECT_TRUE(evsCam->setMaxFramesInFlight(1).isOk());
+ evsCam->checkBufferOrder();
+
+ evsCam->returnBuffer_unsafe(id1);
+ evsCam->checkBufferOrder();
+ evsCam->returnBuffer_unsafe(id2);
+ evsCam->checkBufferOrder();
+}
+
+TEST(EvsCameraForTest, UseAndReturn) {
+ constexpr std::size_t kNumOfHandles = 20;
+ auto evsCam = ndk::SharedRefBase::make<EvsCameraForTest>();
+
+ // Our "fake handles" of this test case is 1 to kNumOfHandles.
+ for (std::size_t i = 1; i <= kNumOfHandles; ++i) {
+ evsCam->increaseAvailableFrames_unsafe(reinterpret_cast<buffer_handle_t>(i));
+ }
+ evsCam->checkBufferOrder();
+
+ {
+ std::vector<std::pair<std::size_t, std::intptr_t>> inUseIDHandlePairs;
+ std::unordered_set<std::size_t> inUseIDs;
+ std::unordered_set<std::intptr_t> inUseHandles;
+ for (std::size_t i = 0; i < kNumOfHandles; ++i) {
+ const auto [id, handle] = evsCam->useBuffer_unsafe();
+ const std::size_t handleInt = reinterpret_cast<std::size_t>(handle);
+ EXPECT_NE(handle, nullptr);
+ EXPECT_LT(id, kNumOfHandles);
+
+ // handleInt must be between [1, kNumOfHandles] as we "allocated" above.
+ EXPECT_LT(0u, handleInt);
+ EXPECT_LE(handleInt, kNumOfHandles);
+
+ inUseIDHandlePairs.push_back({id, handleInt});
+ EXPECT_TRUE(inUseIDs.insert(id).second);
+ EXPECT_TRUE(inUseHandles.insert(handleInt).second);
+ evsCam->checkBufferOrder();
+ }
+ // Return buffers in the order of acquiring.
+ for (const auto [id, handleInt] : inUseIDHandlePairs) {
+ evsCam->returnBuffer_unsafe(id);
+ evsCam->checkBufferOrder();
+ }
+ }
+
+ {
+ std::vector<std::pair<std::size_t, std::intptr_t>> inUseIDHandlePairs;
+ std::unordered_set<std::size_t> inUseIDs;
+ std::unordered_set<std::intptr_t> inUseHandles;
+ for (std::size_t i = 0; i < kNumOfHandles; ++i) {
+ const auto [id, handle] = evsCam->useBuffer_unsafe();
+ const std::size_t handleInt = reinterpret_cast<std::size_t>(handle);
+ EXPECT_NE(handle, nullptr);
+ EXPECT_LT(id, kNumOfHandles);
+
+ // handleInt must be between [1, kNumOfHandles] as we "allocated" above.
+ EXPECT_LT(0u, handleInt);
+ EXPECT_LE(handleInt, kNumOfHandles);
+
+ inUseIDHandlePairs.push_back({id, handleInt});
+ EXPECT_TRUE(inUseIDs.insert(id).second);
+ EXPECT_TRUE(inUseHandles.insert(handleInt).second);
+ evsCam->checkBufferOrder();
+ }
+ // Return buffers in the reverse order of acquiring.
+ std::reverse(inUseIDHandlePairs.begin(), inUseIDHandlePairs.end());
+ for (const auto [id, handleInt] : inUseIDHandlePairs) {
+ evsCam->returnBuffer_unsafe(id);
+ evsCam->checkBufferOrder();
+ }
+ }
+
+ {
+ // Making sure the handles are still in [1, kNumOfHandles] and IDs are still [0,
+ // kNumOfHandles). The mapping may be different, though.
+ std::vector<std::pair<std::size_t, std::intptr_t>> inUseIDHandlePairs;
+ std::unordered_set<std::size_t> inUseIDs;
+ std::unordered_set<std::intptr_t> inUseHandles;
+ for (std::size_t i = 0; i < kNumOfHandles; ++i) {
+ const auto [id, handle] = evsCam->useBuffer_unsafe();
+ const std::size_t handleInt = reinterpret_cast<std::size_t>(handle);
+ EXPECT_NE(handle, nullptr);
+ EXPECT_LT(id, kNumOfHandles);
+
+ // handleInt must be between [1, kNumOfHandles] as we "allocated" above.
+ EXPECT_LT(0u, handleInt);
+ EXPECT_LE(handleInt, kNumOfHandles);
+
+ inUseIDHandlePairs.push_back({id, handleInt});
+ EXPECT_TRUE(inUseIDs.insert(id).second);
+ EXPECT_TRUE(inUseHandles.insert(handleInt).second);
+ evsCam->checkBufferOrder();
+ }
+ }
+}
+
+} // namespace aidl::android::hardware::automotive::evs::implementation