Add EvsCamera Class and Buffer Manipulation (5ed789cd) · Commits · e / os / android_hardware_interfaces

automotive/evs/aidl/impl/default/Android.bp

+48 −22

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		@@ -21,45 +21,41 @@ package {
		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 @@ cc_binary {
		],
		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 @@ prebuilt_etc {
		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",
		],
		}

automotive/evs/aidl/impl/default/include/EvsCamera.h

0 → 100644

+98 −0

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		/*
		* 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

automotive/evs/aidl/impl/default/src/EvsCamera.cpp

0 → 100644

+266 −0

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		/*
		* 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

automotive/evs/aidl/impl/default/tests/EvsCameraBufferTest.cpp

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+208 −0

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