From e03690f1f049240a48d0ccb41a68a746890d784f Mon Sep 17 00:00:00 2001
From: Florent Castelli <florent.castelli@gmail.com>
Date: Sat, 21 Jan 2017 02:36:06 +0100
Subject: [PATCH] cmake: Find prebuilt ffmpeg on Windows

---
 CMakeTests/CheckLib.cmake | 74 +++++++++++++++++++++++++++++----------
 1 file changed, 55 insertions(+), 19 deletions(-)

diff --git a/CMakeTests/CheckLib.cmake b/CMakeTests/CheckLib.cmake
index ac8d17393b..c17dfb5e83 100644
--- a/CMakeTests/CheckLib.cmake
+++ b/CMakeTests/CheckLib.cmake
@@ -61,30 +61,66 @@ macro(check_libav)
 		pkg_check_modules(LIBAV libavcodec>=54.35.0 libavformat>=54.20.4
 			libswscale>=2.1.1 libavutil>=52.3.0)
 	else()
-		# Attempt to find it through static means
-		set(LIBAV_LDFLAGS avformat avcodec swscale avutil)
-		set(CMAKE_REQUIRED_LIBRARIES ${LIBAV_LDFLAGS})
-		CHECK_CXX_SOURCE_COMPILES(
-			"extern \"C\" {
-			#include <libavcodec/avcodec.h>
-			#include <libavformat/avformat.h>
-			#include <libavutil/mathematics.h>
-			#include <libswscale/swscale.h>
-			}
-			int main(int argc, char **argv)
-			{
-				av_register_all();
-				return 0;
-			}"
-			LIBAV_FOUND)
-		unset(CMAKE_REQUIRED_LIBRARIES)
+		if(WIN32)
+			add_library(avcodec STATIC IMPORTED)
+			set_target_properties(avcodec PROPERTIES
+				INTERFACE_INCLUDE_DIRECTORIES ${CMAKE_CURRENT_SOURCE_DIR}/Externals/ffmpeg/include
+				IMPORTED_LOCATION ${CMAKE_CURRENT_SOURCE_DIR}/Externals/ffmpeg/lib/avcodec.lib
+			)
+
+			add_library(avformat STATIC IMPORTED)
+			set_target_properties(avformat PROPERTIES
+				INTERFACE_INCLUDE_DIRECTORIES ${CMAKE_CURRENT_SOURCE_DIR}/Externals/ffmpeg/include
+				IMPORTED_LOCATION ${CMAKE_CURRENT_SOURCE_DIR}/Externals/ffmpeg/lib/avformat.lib
+			)
+
+			add_library(avutil STATIC IMPORTED)
+			set_target_properties(avutil PROPERTIES
+				INTERFACE_INCLUDE_DIRECTORIES ${CMAKE_CURRENT_SOURCE_DIR}/Externals/ffmpeg/include
+				IMPORTED_LOCATION ${CMAKE_CURRENT_SOURCE_DIR}/Externals/ffmpeg/lib/avutil.lib
+			)
+
+			add_library(swresample STATIC IMPORTED)
+			set_target_properties(swresample PROPERTIES
+				INTERFACE_INCLUDE_DIRECTORIES ${CMAKE_CURRENT_SOURCE_DIR}/Externals/ffmpeg/include
+				IMPORTED_LOCATION ${CMAKE_CURRENT_SOURCE_DIR}/Externals/ffmpeg/lib/swresample.lib
+			)
+
+			add_library(swscale STATIC IMPORTED)
+			set_target_properties(swscale PROPERTIES
+				INTERFACE_INCLUDE_DIRECTORIES ${CMAKE_CURRENT_SOURCE_DIR}/Externals/ffmpeg/include
+				IMPORTED_LOCATION ${CMAKE_CURRENT_SOURCE_DIR}/Externals/ffmpeg/lib/swscale.lib
+			)
+
+			set(LIBAV_FOUND ON)
+			set(LIBAV_LIBRARIES avcodec avformat avutil swresample swscale)
+		else()
+			# Attempt to find it through static means
+			set(LIBAV_LDFLAGS avformat avcodec swscale avutil)
+			set(CMAKE_REQUIRED_LIBRARIES ${LIBAV_LDFLAGS})
+			CHECK_CXX_SOURCE_COMPILES(
+				"extern \"C\" {
+				#include <libavcodec/avcodec.h>
+				#include <libavformat/avformat.h>
+				#include <libavutil/mathematics.h>
+				#include <libswscale/swscale.h>
+				}
+				int main(int argc, char **argv)
+				{
+					av_register_all();
+					return 0;
+				}"
+				LIBAV_FOUND)
+			unset(CMAKE_REQUIRED_LIBRARIES)
+	  endif()
 	endif()
 	if(LIBAV_FOUND)
 		message(STATUS "libav/ffmpeg found, enabling AVI frame dumps")
 		add_definitions(-DHAVE_LIBAV)
-		include_directories(${LIBAV_INCLUDE_DIRS})
+		if(LIBAV_INCLUDE_DIRS)
+			include_directories(${LIBAV_INCLUDE_DIRS})
+		endif()
 	else()
 		message(STATUS "libav/ffmpeg not found, disabling AVI frame dumps")
 	endif()
 endmacro()
-