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/* 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"
#if defined(_GLIBCXX_RELEASE) && _GLIBCXX_RELEASE < 8
#include <experimental/filesystem>
namespace std {
namespace filesystem = std::experimental::filesystem;
}
#else
#include <filesystem>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string>
#include <yaml.h>
#include <hardware/camera3.h>
#include <libcamera/base/log.h>
using namespace libcamera;
LOG_DEFINE_CATEGORY(HALConfig)
class CameraHalConfig::Private : public Extensible::Private
{
LIBCAMERA_DECLARE_PUBLIC(CameraHalConfig)
public:
Private();
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()
{
}
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
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(std::make_unique<Private>()), 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;
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;
}
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