diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/android/camera_hal_config.cpp | 400 | ||||
| -rw-r--r-- | src/android/camera_hal_config.h | 40 | ||||
| -rw-r--r-- | src/android/meson.build | 2 |
3 files changed, 442 insertions, 0 deletions
diff --git a/src/android/camera_hal_config.cpp b/src/android/camera_hal_config.cpp new file mode 100644 index 00000000..12d69a3f --- /dev/null +++ b/src/android/camera_hal_config.cpp @@ -0,0 +1,400 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ +/* + * Copyright (C) 2021, Google Inc. + * + * camera_hal_config.cpp - Camera HAL configuration file manager + */ +#include "camera_hal_config.h" + +#include <stdio.h> +#include <stdlib.h> +#include <string> +#include <yaml.h> + +#include <hardware/camera3.h> + +#include "libcamera/internal/log.h" + +using namespace libcamera; + +LOG_DEFINE_CATEGORY(HALConfig) + +class CameraHalConfig::Private : public Extensible::Private +{ + LIBCAMERA_DECLARE_PUBLIC(CameraHalConfig) + +public: + Private(CameraHalConfig *halConfig); + + int parseConfigFile(FILE *fh, std::map<std::string, CameraConfigData> *cameras); + +private: + std::string parseValue(); + std::string parseKey(); + int parseValueBlock(); + int parseCameraLocation(CameraConfigData *cameraConfigData, + const std::string &location); + int parseCameraConfigData(const std::string &cameraId); + int parseCameras(); + int parseEntry(); + + yaml_parser_t parser_; + std::map<std::string, CameraConfigData> *cameras_; +}; + +CameraHalConfig::Private::Private(CameraHalConfig *halConfig) + : Extensible::Private(halConfig) +{ +} + +std::string CameraHalConfig::Private::parseValue() +{ + yaml_token_t token; + + /* Make sure the token type is a value and get its content. */ + yaml_parser_scan(&parser_, &token); + if (token.type != YAML_VALUE_TOKEN) { + yaml_token_delete(&token); + return ""; + } + yaml_token_delete(&token); + + yaml_parser_scan(&parser_, &token); + if (token.type != YAML_SCALAR_TOKEN) { + yaml_token_delete(&token); + return ""; + } + + std::string value(reinterpret_cast<char *>(token.data.scalar.value), + token.data.scalar.length); + yaml_token_delete(&token); + + return value; +} + +std::string CameraHalConfig::Private::parseKey() +{ + yaml_token_t token; + + /* Make sure the token type is a key and get its value. */ + yaml_parser_scan(&parser_, &token); + if (token.type != YAML_SCALAR_TOKEN) { + yaml_token_delete(&token); + return ""; + } + + std::string value(reinterpret_cast<char *>(token.data.scalar.value), + token.data.scalar.length); + yaml_token_delete(&token); + + return value; +} + +int CameraHalConfig::Private::parseValueBlock() +{ + yaml_token_t token; + + /* Make sure the next token are VALUE and BLOCK_MAPPING_START. */ + yaml_parser_scan(&parser_, &token); + if (token.type != YAML_VALUE_TOKEN) { + yaml_token_delete(&token); + return -EINVAL; + } + yaml_token_delete(&token); + + yaml_parser_scan(&parser_, &token); + if (token.type != YAML_BLOCK_MAPPING_START_TOKEN) { + yaml_token_delete(&token); + return -EINVAL; + } + yaml_token_delete(&token); + + return 0; +} + +int CameraHalConfig::Private::parseCameraLocation(CameraConfigData *cameraConfigData, + const std::string &location) +{ + if (location == "front") + cameraConfigData->facing = CAMERA_FACING_FRONT; + else if (location == "back") + cameraConfigData->facing = CAMERA_FACING_BACK; + else if (location == "external") + cameraConfigData->facing = CAMERA_FACING_EXTERNAL; + else + return -EINVAL; + + return 0; +} + +int CameraHalConfig::Private::parseCameraConfigData(const std::string &cameraId) +{ + int ret = parseValueBlock(); + if (ret) + return ret; + + /* + * Parse the camera properties and store them in a cameraConfigData + * instance. + * + * Add a safety counter to make sure we don't loop indefinitely in case + * the configuration file is malformed. + */ + CameraConfigData cameraConfigData; + unsigned int sentinel = 100; + bool blockEnd = false; + yaml_token_t token; + + do { + yaml_parser_scan(&parser_, &token); + switch (token.type) { + case YAML_KEY_TOKEN: { + yaml_token_delete(&token); + + /* + * Parse the camera property key and make sure it is + * valid. + */ + std::string key = parseKey(); + std::string value = parseValue(); + if (key.empty() || value.empty()) + return -EINVAL; + + if (key == "location") { + ret = parseCameraLocation(&cameraConfigData, value); + if (ret) { + LOG(HALConfig, Error) + << "Unknown location: " << value; + return -EINVAL; + } + } else if (key == "rotation") { + ret = std::stoi(value); + if (ret < 0 || ret >= 360) { + LOG(HALConfig, Error) + << "Unknown rotation: " << value; + return -EINVAL; + } + cameraConfigData.rotation = ret; + } else { + LOG(HALConfig, Error) + << "Unknown key: " << key; + return -EINVAL; + } + break; + } + + case YAML_BLOCK_END_TOKEN: + blockEnd = true; + [[fallthrough]]; + default: + yaml_token_delete(&token); + break; + } + + --sentinel; + } while (!blockEnd && sentinel); + if (!sentinel) + return -EINVAL; + + (*cameras_)[cameraId] = cameraConfigData; + + return 0; +} + +int CameraHalConfig::Private::parseCameras() +{ + int ret = parseValueBlock(); + if (ret) { + LOG(HALConfig, Error) << "Configuration file is not valid"; + return ret; + } + + /* + * Parse the camera properties. + * + * Each camera properties block is a list of properties associated + * with the ID (as assembled by CameraSensor::generateId()) of the + * camera they refer to. + * + * cameras: + * "camera0 id": + * key: value + * key: value + * ... + * + * "camera1 id": + * key: value + * key: value + * ... + */ + bool blockEnd = false; + yaml_token_t token; + do { + yaml_parser_scan(&parser_, &token); + switch (token.type) { + case YAML_KEY_TOKEN: { + yaml_token_delete(&token); + + /* Parse the camera ID as key of the property list. */ + std::string cameraId = parseKey(); + if (cameraId.empty()) + return -EINVAL; + + ret = parseCameraConfigData(cameraId); + if (ret) + return -EINVAL; + break; + } + case YAML_BLOCK_END_TOKEN: + blockEnd = true; + [[fallthrough]]; + default: + yaml_token_delete(&token); + break; + } + } while (!blockEnd); + + return 0; +} + +int CameraHalConfig::Private::parseEntry() +{ + int ret = -EINVAL; + + /* + * Parse each key we find in the file. + * + * The 'cameras' keys maps to a list of (lists) of camera properties. + */ + + std::string key = parseKey(); + if (key.empty()) + return ret; + + if (key == "cameras") + ret = parseCameras(); + else + LOG(HALConfig, Error) << "Unknown key: " << key; + + return ret; +} + +int CameraHalConfig::Private::parseConfigFile(FILE *fh, + std::map<std::string, CameraConfigData> *cameras) +{ + cameras_ = cameras; + + int ret = yaml_parser_initialize(&parser_); + if (!ret) { + LOG(HALConfig, Error) << "Failed to initialize yaml parser"; + return -EINVAL; + } + yaml_parser_set_input_file(&parser_, fh); + + yaml_token_t token; + yaml_parser_scan(&parser_, &token); + if (token.type != YAML_STREAM_START_TOKEN) { + LOG(HALConfig, Error) << "Configuration file is not valid"; + yaml_token_delete(&token); + yaml_parser_delete(&parser_); + return -EINVAL; + } + yaml_token_delete(&token); + + yaml_parser_scan(&parser_, &token); + if (token.type != YAML_BLOCK_MAPPING_START_TOKEN) { + LOG(HALConfig, Error) << "Configuration file is not valid"; + yaml_token_delete(&token); + yaml_parser_delete(&parser_); + return -EINVAL; + } + yaml_token_delete(&token); + + /* Parse the file and parse each single key one by one. */ + do { + yaml_parser_scan(&parser_, &token); + switch (token.type) { + case YAML_KEY_TOKEN: + yaml_token_delete(&token); + ret = parseEntry(); + break; + + case YAML_STREAM_END_TOKEN: + ret = -ENOENT; + [[fallthrough]]; + default: + yaml_token_delete(&token); + break; + } + } while (ret >= 0); + yaml_parser_delete(&parser_); + + if (ret && ret != -ENOENT) + LOG(HALConfig, Error) << "Configuration file is not valid"; + + return ret == -ENOENT ? 0 : ret; +} + +CameraHalConfig::CameraHalConfig() + : Extensible(new Private(this)), exists_(false), valid_(false) +{ + parseConfigurationFile(); +} + +/* + * Open the HAL configuration file and validate its content. + * Return 0 on success, a negative error code otherwise + * retval -ENOENT The configuration file is not available + * retval -EINVAL The configuration file is available but not valid + */ +int CameraHalConfig::parseConfigurationFile() +{ + std::filesystem::path filePath = LIBCAMERA_SYSCONF_DIR; + filePath /= "camera_hal.yaml"; + if (!std::filesystem::is_regular_file(filePath)) { + LOG(HALConfig, Debug) + << "Configuration file: \"" << filePath << "\" not found"; + return -ENOENT; + } + + FILE *fh = fopen(filePath.c_str(), "r"); + if (!fh) { + int ret = -errno; + LOG(HALConfig, Error) << "Failed to open configuration file " + << filePath << ": " << strerror(-ret); + return ret; + } + + exists_ = true; + + Private *const d = LIBCAMERA_D_PTR(); + int ret = d->parseConfigFile(fh, &cameras_); + fclose(fh); + if (ret) + return -EINVAL; + + valid_ = true; + + for (const auto &c : cameras_) { + const std::string &cameraId = c.first; + const CameraConfigData &camera = c.second; + LOG(HALConfig, Debug) << "'" << cameraId << "' " + << "(" << camera.facing << ")[" + << camera.rotation << "]"; + } + + return 0; +} + +const CameraConfigData *CameraHalConfig::cameraConfigData(const std::string &cameraId) const +{ + const auto &it = cameras_.find(cameraId); + if (it == cameras_.end()) { + LOG(HALConfig, Error) + << "Camera '" << cameraId + << "' not described in the HAL configuration file"; + return nullptr; + } + + return &it->second; +} diff --git a/src/android/camera_hal_config.h b/src/android/camera_hal_config.h new file mode 100644 index 00000000..0555c6da --- /dev/null +++ b/src/android/camera_hal_config.h @@ -0,0 +1,40 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ +/* + * Copyright (C) 2021, Google Inc. + * + * camera_hal_config.h - Camera HAL configuration file manager + */ +#ifndef __ANDROID_CAMERA_HAL_CONFIG_H__ +#define __ANDROID_CAMERA_HAL_CONFIG_H__ + +#include <filesystem> +#include <map> +#include <string> + +#include <libcamera/class.h> + +struct CameraConfigData { + int facing = -1; + int rotation = -1; +}; + +class CameraHalConfig final : public libcamera::Extensible +{ + LIBCAMERA_DECLARE_PRIVATE() + +public: + CameraHalConfig(); + + bool exists() const { return exists_; } + bool isValid() const { return valid_; } + + const CameraConfigData *cameraConfigData(const std::string &cameraId) const; + +private: + bool exists_; + bool valid_; + std::map<std::string, CameraConfigData> cameras_; + + int parseConfigurationFile(); +}; +#endif /* __ANDROID_CAMERA_HAL_CONFIG_H__ */ diff --git a/src/android/meson.build b/src/android/meson.build index 2be20c97..3893e5b5 100644 --- a/src/android/meson.build +++ b/src/android/meson.build @@ -3,6 +3,7 @@ android_deps = [ dependency('libexif', required : get_option('android')), dependency('libjpeg', required : get_option('android')), + dependency('yaml-0.1', required : get_option('android')), ] android_enabled = true @@ -45,6 +46,7 @@ android_hal_sources = files([ 'camera3_hal.cpp', 'camera_hal_manager.cpp', 'camera_device.cpp', + 'camera_hal_config.cpp', 'camera_metadata.cpp', 'camera_ops.cpp', 'camera_stream.cpp', |