[camera][draft] Add camera plugin (#29)

Added the first draft version, but there are still a lot of unimplemented features.

packages/camera/elinux/CMakeLists.txt

@@ -0,0 +1,47 @@
+cmake_minimum_required(VERSION 3.15)
+set(PROJECT_NAME "camera_elinux")
+project(${PROJECT_NAME} LANGUAGES CXX)
+
+# This value is used when generating builds using this plugin, so it must
+# not be changed
+set(PLUGIN_NAME "camera_elinux_plugin")
+
+find_package(PkgConfig)
+pkg_check_modules(GLIB REQUIRED glib-2.0)
+pkg_check_modules(GSTREAMER REQUIRED gstreamer-1.0)
+
+add_library(${PLUGIN_NAME} SHARED
+  "camera_elinux_plugin.cc"
+  "gst_camera.cc"
+  "types/exposure_mode.cc"
+  "types/focus_mode.cc"
+  "types/orientation.cc"
+  "method_channel/method_channel_camera.cc"
+  "method_channel/method_channel_device.cc"
+)
+apply_standard_settings(${PLUGIN_NAME})
+set_target_properties(${PLUGIN_NAME} PROPERTIES
+  CXX_VISIBILITY_PRESET hidden)
+target_compile_definitions(${PLUGIN_NAME} PRIVATE FLUTTER_PLUGIN_IMPL)
+target_include_directories(${PLUGIN_NAME} INTERFACE
+  "${CMAKE_CURRENT_SOURCE_DIR}/include")
+target_link_libraries(${PLUGIN_NAME} PRIVATE flutter flutter_wrapper_plugin)
+
+target_include_directories(${PLUGIN_NAME}
+  PRIVATE
+    "./"
+    ${GLIB_INCLUDE_DIRS}
+    ${GSTREAMER_INCLUDE_DIRS}
+)
+
+target_link_libraries(${PLUGIN_NAME}
+  PRIVATE
+    ${GLIB_LIBRARIES}
+    ${GSTREAMER_LIBRARIES}
+)
+
+# List of absolute paths to libraries that should be bundled with the plugin
+set(camera_elinux_bundled_libraries
+  ""
+  PARENT_SCOPE
+)