chore: Add objc modules to libwebrtc for mac (#179)

* add objc modules to libwebrtc for mac

* [skip ci] Update plugins

Author: karasusan

BuildScripts~/build_libwebrtc_macos.sh

@@ -24,6 +24,9 @@ fi
 # add jsoncpp
 patch -N "src/BUILD.gn" < "$COMMAND_DIR/patches/add_jsoncpp.patch"
 
+# add objc library to use videotoolbox
+patch -N "src/sdk/BUILD.gn" < "$COMMAND_DIR/patches/add_objc_mac.patch"
+
 mkdir -p "$ARTIFACTS_DIR/lib"
 
 # generate ninja files for release

BuildScripts~/patches/add_objc_mac.patch

@@ -0,0 +1,19 @@
+--- src/sdk/BUILD.gn	2020-08-31 17:02:50.000000000 +0900
++++ src/sdk/BUILD.gn.edited	2020-08-31 17:15:53.000000000 +0900
+@@ -24,6 +24,16 @@ group("sdk") {
+     if (is_ios) {
+       public_deps += [ ":framework_objc" ]
+     }
++    if(is_mac) {
++      public_deps += [ 
++        ":base_objc",
++        ":default_codec_factory_objc",
++        ":native_api",
++        ":native_video",
++        ":videocodec_objc",
++        ":videotoolbox_objc"
++      ]
++    }
+   }
+ }
+ 

Plugin~/WebRTCPlugin/CMakeLists.txt

@@ -38,12 +38,11 @@ if(MSVC)
 elseif(APPLE)
   file(GLOB append_source
     ../libcxx/debug.cpp
+    *.mm
     GraphicsDevice/Metal/*.h
     GraphicsDevice/Metal/*.mm
     Codec/SoftwareCodec/*.h
     Codec/SoftwareCodec/*.cpp
-    #Codec/VideoToolbox/VTEncoderMetal.mm
-    #Codec/VideoToolbox/VTEncoderMetal.h
   )
   list (APPEND sources ${append_source})
 elseif(UNIX)
@@ -165,7 +164,15 @@ elseif(APPLE)
     PROPERTIES LIBRARY_OUTPUT_DIRECTORY_RELEASE 
       ${PROJECT_BINARY_DIR}
   )
+  target_include_directories(webrtc
+    PRIVATE
+      ${WEBRTC_OBJC_INCLUDE_DIR}
+  )
 
+  set_target_properties( webrtc 
+    PROPERTIES LINK_FLAGS 
+      "-ObjC"
+  )  
 elseif(UNIX)
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-lto -fno-rtti -stdlib=libc++")
 

Plugin~/WebRTCPluginTest/CMakeLists.txt

@@ -41,6 +41,7 @@ if(MSVC)
 elseif(APPLE)
   file(GLOB append_source
     ../libcxx/debug.cpp
+    ../WebRTCPlugin/*.mm
     ../WebRTCPlugin/GraphicsDevice/Metal/*.h
     ../WebRTCPlugin/GraphicsDevice/Metal/*.mm
     ../WebRTCPlugin/Codec/SoftwareCodec/*.h
@@ -132,6 +133,11 @@ if(MSVC)
 elseif(APPLE)
   set(CMAKE_C_FLAGS "-x objective-c")
   set(CMAKE_CXX_FLAGS "-x objective-c++")
+  
+  set_target_properties( WebRTCPluginTest 
+    PROPERTIES LINK_FLAGS 
+      "-ObjC"
+  )  
 
   target_compile_definitions(WebRTCPluginTest
     PRIVATE
@@ -151,6 +157,7 @@ elseif(APPLE)
   target_include_directories(WebRTCPluginTest
     PRIVATE
       ..
+      ${WEBRTC_OBJC_INCLUDE_DIR}
   )
 elseif(UNIX)
   find_package(OpenGL REQUIRED)

Plugin~/cmake/FindFramework.cmake

@@ -1,5 +1,6 @@
 
 find_library(CORE_FOUNDATION Foundation)
+find_library(AV_FOUNDATION AVFoundation)
 find_library(APPLICATION_SERVICES ApplicationServices)
 find_library(CORE_SERVICES CoreServices)
 find_library(CORE_AUDIO CoreAudio)
@@ -11,6 +12,7 @@ find_library(METAL Metal)
 
 set(FRAMEWORK_LIBS
   ${CORE_FOUNDATION}
+  ${AV_FOUNDATION}
   ${APPLICATION_SERVICES}
   ${CORE_SERVICES}
   ${CORE_AUDIO}

Plugin~/cmake/FindWebRTC.cmake

@@ -3,10 +3,15 @@
 set(WEBRTC_DIR "${CMAKE_SOURCE_DIR}/webrtc")
 
 set(WEBRTC_INCLUDE_DIR
-    ${WEBRTC_DIR}/include
-    ${WEBRTC_DIR}/include/third_party/abseil-cpp
-    ${WEBRTC_DIR}/include/third_party/jsoncpp/source/include
-    ${WEBRTC_DIR}/include/third_party/jsoncpp/generated
+  ${WEBRTC_DIR}/include
+  ${WEBRTC_DIR}/include/third_party/abseil-cpp
+  ${WEBRTC_DIR}/include/third_party/jsoncpp/source/include
+  ${WEBRTC_DIR}/include/third_party/jsoncpp/generated
+)
+
+set(WEBRTC_OBJC_INCLUDE_DIR
+  ${WEBRTC_DIR}/include/sdk/objc
+  ${WEBRTC_DIR}/include/sdk/objc/base
 )
 
 set(WEBRTC_LIBRARY_DIR