From 7d072920554bfacad57d93ce735abd96b62064de Mon Sep 17 00:00:00 2001
From: Berkus Decker <berkus@madfire.net>
Date: Thu, 23 Nov 2017 21:42:06 +0200
Subject: [PATCH] Add FindFFmpeg.cmake

From https://gist.githubusercontent.com/jet47/4265752/raw/adef926e2f061e440fbcd36644b719d55815444b/FindFFmpeg.cmake
---
 modules/FindFFmpeg.cmake | 133 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 133 insertions(+)
 create mode 100644 modules/FindFFmpeg.cmake

diff --git a/modules/FindFFmpeg.cmake b/modules/FindFFmpeg.cmake
new file mode 100644
index 000000000..9a8c9d830
--- /dev/null
+++ b/modules/FindFFmpeg.cmake
@@ -0,0 +1,133 @@
+# - Try to find FFMPEG
+# Once done this will define
+#
+#  FFMPEG_FOUND      - system has FFMPEG
+#  FFMPEG_INCLUDE_DIR    - the include directories
+#  FFMPEG_LIBRARY_DIR    - the directory containing the libraries
+#  FFMPEG_LIBRARIES  - link these to use FFMPEG
+#  FFMPEG_SWSCALE_FOUND  - FFMPEG also has SWSCALE
+#
+
+SET( FFMPEG_HEADERS avformat.h avcodec.h avutil.h avdevice.h )
+SET( FFMPEG_PATH_SUFFIXES libavformat libavcodec libavutil libavdevice )
+SET( FFMPEG_SWS_HEADERS swscale.h )
+SET( FFMPEG_SWS_PATH_SUFFIXES libswscale )
+SET( FFMPEG_PP_HEADERS postproc.h )
+SET( FFMPEG_PP_PATH_SUFFIXES libpostproc )
+
+if( $ENV{FFMPEGDIR} )
+    SET( FFMPEG_LIBRARIES avformat-52.lib avcodec-51.lib avutil-49.lib avdevice-52.lib )
+    SET( FFMPEG_SWS_LIBRARIES swscale-0.lib )
+    SET( FFMPEG_PP_LIBRARIES postproc-0.lib )
+    SET( FFMPEG_LIBRARY_DIR $ENV{FFMPEGDIR}\\lib )
+    SET( FFMPEG_INCLUDE_PATHS $ENV{FFMPEGDIR}\\include )
+
+    # check to see if we can find swscale
+    SET( TMP_ TMP-NOTFOUND )
+    FIND_PATH( TMP_ ${FFMPEG_SWS_LIBRARIES} ${FFMPEG_PP_LIBRARIES}
+                    PATHS ${FFMPEG_LIBRARY_DIR} )
+    IF ( TMP_ )
+        SET( SWSCALE_FOUND TRUE )
+    ENDIF( TMP_ )
+else( $ENV{FFMPEGDIR} )
+    SET( FFMPEG_LIBRARIES avformat avcodec avutil avdevice )
+    SET( FFMPEG_SWS_LIBRARIES swscale )
+    SET( FFMPEG_PP_LIBRARIES postproc )
+    INCLUDE(FindPkgConfig)
+    if ( PKG_CONFIG_FOUND )
+        pkg_check_modules( AVFORMAT libavformat )
+        pkg_check_modules( AVCODEC libavcodec )
+        pkg_check_modules( AVUTIL libavutil )
+        pkg_check_modules( AVDEVICE libavdevice )
+        pkg_check_modules( SWSCALE libswscale )
+        pkg_check_modules( POSTPROC libpostproc )
+    endif ( PKG_CONFIG_FOUND )
+
+    SET( FFMPEG_LIBRARY_DIR     ${AVFORMAT_LIBRARY_DIRS}
+                                ${AVCODEC_LIBRARY_DIRS}
+                                ${AVUTIL_LIBRARY_DIRS}
+                                ${AVDEVICE_LIBRARY_DIRS} )
+    SET( FFMPEG_INCLUDE_PATHS   ${AVFORMAT_INCLUDE_DIRS}
+                                ${AVCODEC_INCLUDE_DIRS}
+                                ${AVUTIL_INCLUDE_DIRS}
+                                ${AVDEVICE_INCLUDE_DIRS} )
+endif( $ENV{FFMPEGDIR} )
+
+# add in swscale if found
+IF ( SWSCALE_FOUND )
+    SET( FFMPEG_LIBRARY_DIR     ${FFMPEG_LIBRARY_DIR}
+                                ${SWSCALE_LIBRARY_DIRS} )
+    SET( FFMPEG_INCLUDE_PATHS   ${FFMPEG_INCLUDE_PATHS}
+                                ${SWSCALE_INCLUDE_DIRS} )
+    SET( FFMPEG_HEADERS         ${FFMPEG_HEADERS}
+                                ${FFMPEG_SWS_HEADERS} )
+    SET( FFMPEG_PATH_SUFFIXES   ${FFMPEG_PATH_SUFFIXES}
+                                ${FFMPEG_SWS_PATH_SUFFIXES} )
+    SET( FFMPEG_LIBRARIES       ${FFMPEG_LIBRARIES}
+                                ${FFMPEG_SWS_LIBRARIES} )
+ENDIF ( SWSCALE_FOUND )
+
+# add in postproc if found
+IF ( POSTPROC_FOUND )
+    SET( FFMPEG_LIBRARY_DIR     ${FFMPEG_LIBRARY_DIR}
+                                ${POSTPROC_LIBRARY_DIRS} )
+    SET( FFMPEG_INCLUDE_PATHS   ${FFMPEG_INCLUDE_PATHS}
+                                ${POSTPROC_INCLUDE_DIRS} )
+    SET( FFMPEG_HEADERS         ${FFMPEG_HEADERS}
+                                ${FFMPEG_PP_HEADERS} )
+    SET( FFMPEG_PATH_SUFFIXES   ${FFMPEG_PATH_SUFFIXES}
+                                ${FFMPEG_PP_PATH_SUFFIXES} )
+    SET( FFMPEG_LIBRARIES       ${FFMPEG_LIBRARIES}
+                                ${FFMPEG_PP_LIBRARIES} )
+ENDIF ( POSTPROC_FOUND )
+
+# find includes
+SET( INC_SUCCESS 0 )
+SET( TMP_ TMP-NOTFOUND )
+SET( FFMPEG_INCLUDE_DIR ${FFMPEG_INCLUDE_PATHS} )
+FOREACH( INC_ ${FFMPEG_HEADERS} )
+    message( "checking: " ${INC_} )
+
+    FIND_PATH( TMP_ ${INC_}
+        PATHS ${FFMPEG_INCLUDE_PATHS}
+        PATH_SUFFIXES ${FFMPEG_PATH_SUFFIXES} )
+    IF ( TMP_ )
+        message( "found: " ${TMP_} )
+        MATH( EXPR INC_SUCCESS ${INC_SUCCESS}+1 )
+        SET( FFMPEG_INCLUDE_DIR ${FFMPEG_INCLUDE_DIR} ${TMP_} )
+    ENDIF ( TMP_ )
+    SET( TMP_ TMP-NOTFOUND )
+ENDFOREACH( INC_ )
+
+# clear out duplicates
+IF (FFMPEG_INCLUDE_DIR)
+    LIST( REMOVE_DUPLICATES FFMPEG_INCLUDE_DIR )
+ENDIF (FFMPEG_INCLUDE_DIR)
+
+IF (FFMPEG_LIBRARY_DIR)
+    LIST( REMOVE_DUPLICATES FFMPEG_LIBRARY_DIR )
+ENDIF (FFMPEG_LIBRARY_DIR)
+
+# find the full paths of the libraries
+SET( TMP_ TMP-NOTFOUND )
+IF ( NOT WIN32 )
+    FOREACH( LIB_ ${FFMPEG_LIBRARIES} )
+        FIND_LIBRARY( TMP_ NAMES ${LIB_} PATHS ${FFMPEG_LIBRARY_DIR} )
+        IF ( TMP_ )
+     SET( FFMPEG_LIBRARIES_FULL ${FFMPEG_LIBRARIES_FULL} ${TMP_} )
+        ENDIF ( TMP_ )
+        SET( TMP_ TMP-NOTFOUND )
+    ENDFOREACH( LIB_ )
+    SET ( FFMPEG_LIBRARIES ${FFMPEG_LIBRARIES_FULL} )
+ENDIF( NOT WIN32 )
+
+LIST( LENGTH FFMPEG_HEADERS LIST_SIZE_ )
+
+SET( FFMPEG_FOUND FALSE )
+SET( FFMPEG_SWSCALE_FOUND FALSE )
+SET( FFMPEG_POSTPROC_FOUND FALSE )
+IF ( ${INC_SUCCESS} EQUAL ${LIST_SIZE_} )
+    SET( FFMPEG_FOUND TRUE )
+    SET( FFMPEG_SWSCALE_FOUND ${SWSCALE_FOUND} )
+    SET( FFMPEG_POSTPROC_FOUND ${POSTPROC_FOUND} )
+ENDIF ( ${INC_SUCCESS} EQUAL ${LIST_SIZE_} )