make it a soft error if gstreamer libs aren't found

Author: ardera

CMakeLists.txt

@@ -41,6 +41,7 @@ option(BUILD_RAW_KEYBOARD_PLUGIN "Include the raw keyboard plugin in the finishe
 option(BUILD_TEST_PLUGIN "Include the test plugin in the finished binary. Allows testing platform channel communication." OFF)
 option(BUILD_OMXPLAYER_VIDEO_PLAYER_PLUGIN "Include the omxplayer_video_player plugin in the finished binary. Allows for hardware accelerated video playback in flutter using omxplayer." ON)
 option(BUILD_GSTREAMER_VIDEO_PLAYER_PLUGIN "Include the gstreamer_video_player plugin in the finished binary. Allows for more stable, hardware accelerated video playback in flutter using gstreamer." ON)
+option(TRY_BUILD_GSTREAMER_VIDEO_PLAYER_PLUGIN "Don't throw an error if the gstreamer libs aren't found, instead just don't build the gstreamer video player plugin in that case." ON)
 option(DUMP_ENGINE_LAYERS "True if flutter-pi should dump the list of rendering layers that the flutter engine sends to flutter-pi on each draw." OFF)
 option(ENABLE_TSAN "True to build & link with -fsanitize=thread" OFF)
 option(ENABLE_ASAN "True to build & link with -fsanitize=address" OFF)
@@ -193,39 +194,51 @@ if (OMXPLAYER_SUPPORTS_RUNTIME_ROTATION)
   target_compile_definitions(flutter-pi PRIVATE "OMXPLAYER_SUPPORTS_RUNTIME_ROTATION")
 endif()
 if (BUILD_GSTREAMER_VIDEO_PLAYER_PLUGIN)
-  pkg_check_modules(LIBGSTREAMER REQUIRED gstreamer-1.0)
-  pkg_check_modules(LIBGSTREAMER_PLUGINS_BASE REQUIRED gstreamer-plugins-base-1.0)
-  pkg_check_modules(LIBGSTREAMER_APP REQUIRED gstreamer-app-1.0)
-  pkg_check_modules(LIBGSTREAMER_ALLOCATORS REQUIRED gstreamer-allocators-1.0)
-  pkg_check_modules(LIBGSTREAMER_VIDEO REQUIRED gstreamer-video-1.0)
+  if (TRY_BUILD_GSTREAMER_VIDEO_PLAYER_PLUGIN)
+    pkg_check_modules(LIBGSTREAMER gstreamer-1.0)
+    pkg_check_modules(LIBGSTREAMER_PLUGINS_BASE gstreamer-plugins-base-1.0)
+    pkg_check_modules(LIBGSTREAMER_APP gstreamer-app-1.0)
+    pkg_check_modules(LIBGSTREAMER_ALLOCATORS gstreamer-allocators-1.0)
+    pkg_check_modules(LIBGSTREAMER_VIDEO gstreamer-video-1.0)
+  else()
+    pkg_check_modules(LIBGSTREAMER REQUIRED gstreamer-1.0)
+    pkg_check_modules(LIBGSTREAMER_PLUGINS_BASE REQUIRED gstreamer-plugins-base-1.0)
+    pkg_check_modules(LIBGSTREAMER_APP REQUIRED gstreamer-app-1.0)
+    pkg_check_modules(LIBGSTREAMER_ALLOCATORS REQUIRED gstreamer-allocators-1.0)
+    pkg_check_modules(LIBGSTREAMER_VIDEO REQUIRED gstreamer-video-1.0)
+  endif()
 
-  target_sources(flutter-pi PRIVATE
-    src/plugins/gstreamer_video_player/plugin.c
-    src/plugins/gstreamer_video_player/player.c
-    src/plugins/gstreamer_video_player/frame.c
-  )
-  target_compile_definitions(flutter-pi PRIVATE "BUILD_GSTREAMER_VIDEO_PLAYER_PLUGIN")
-  target_link_libraries(flutter-pi
-    ${LIBGSTREAMER_LDFLAGS}
-    ${LIBGSTREAMER_PLUGINS_BASE_LDFLAGS}
-    ${LIBGSTREAMER_APP_LDFLAGS}
-    ${LIBGSTREAMER_ALLOCATORS_LDFLAGS}
-    ${LIBGSTREAMER_VIDEO_LDFLAGS}
-  )
-  target_include_directories(flutter-pi PRIVATE
-    ${LIBGSTREAMER_INCLUDE_DIRS}
-    ${LIBGSTREAMER_PLUGINS_BASE_INCLUDE_DIRS}
-    ${LIBGSTREAMER_APP_INCLUDE_DIRS}
-    ${LIBGSTREAMER_ALLOCATORS_INCLUDE_DIRS}
-    ${LIBGSTREAMER_VIDEO_INCLUDE_DIRS}
-  )
-  target_compile_options(flutter-pi PRIVATE
-    ${LIBGSTREAMER_CFLAGS}
-    ${LIBGSTREAMER_PLUGINS_BASE_CFLAGS}
-    ${LIBGSTREAMER_APP_CFLAGS}
-    ${LIBGSTREAMER_ALLOCATORS_CFLAGS}
-    ${LIBGSTREAMER_VIDEO_CFLAGS}
-  )
+  if (LIBGSTREAMER_FOUND AND LIBGSTREAMER_PLUGINS_BASE_FOUND AND LIBGSTREAMER_APP_FOUND AND LIBGSTREAMER_ALLOCATORS_FOUND AND LIBGSTREAMER_VIDEO_FOUND)
+    target_sources(flutter-pi PRIVATE
+      src/plugins/gstreamer_video_player/plugin.c
+      src/plugins/gstreamer_video_player/player.c
+      src/plugins/gstreamer_video_player/frame.c
+    )
+    target_compile_definitions(flutter-pi PRIVATE "BUILD_GSTREAMER_VIDEO_PLAYER_PLUGIN")
+    target_link_libraries(flutter-pi
+      ${LIBGSTREAMER_LDFLAGS}
+      ${LIBGSTREAMER_PLUGINS_BASE_LDFLAGS}
+      ${LIBGSTREAMER_APP_LDFLAGS}
+      ${LIBGSTREAMER_ALLOCATORS_LDFLAGS}
+      ${LIBGSTREAMER_VIDEO_LDFLAGS}
+    )
+    target_include_directories(flutter-pi PRIVATE
+      ${LIBGSTREAMER_INCLUDE_DIRS}
+      ${LIBGSTREAMER_PLUGINS_BASE_INCLUDE_DIRS}
+      ${LIBGSTREAMER_APP_INCLUDE_DIRS}
+      ${LIBGSTREAMER_ALLOCATORS_INCLUDE_DIRS}
+      ${LIBGSTREAMER_VIDEO_INCLUDE_DIRS}
+    )
+    target_compile_options(flutter-pi PRIVATE
+      ${LIBGSTREAMER_CFLAGS}
+      ${LIBGSTREAMER_PLUGINS_BASE_CFLAGS}
+      ${LIBGSTREAMER_APP_CFLAGS}
+      ${LIBGSTREAMER_ALLOCATORS_CFLAGS}
+      ${LIBGSTREAMER_VIDEO_CFLAGS}
+    )
+  else()
+    message(NOTICE "Couldn't find gstreamer libraries. Gstreamer video player plugin won't be build.")
+  endif()
 endif()
 
 # Needed so dart VM can actually resolve symbols in the same