Allow for system ffmpeg usage.

Warning: this is NOT advised right now.

CMake/Modules/FindFFMPEG.cmake

@@ -0,0 +1,224 @@
+# This was copied from the robotology/ycm project.
+
+#.rst:
+# FindFFMPEG
+# ----------
+#
+# Find the native FFMPEG includes and library
+#
+# This module defines::
+#
+#  FFMPEG_INCLUDE_DIR, where to find avcodec.h, avformat.h ...
+#  FFMPEG_LIBRARIES, the libraries to link against to use FFMPEG.
+#  FFMPEG_FOUND, If false, do not try to use FFMPEG.
+#
+# also defined, but not for general use are::
+#
+#   FFMPEG_avformat_LIBRARY, where to find the FFMPEG avformat library.
+#   FFMPEG_avcodec_LIBRARY, where to find the FFMPEG avcodec library.
+#
+# This is useful to do it this way so that we can always add more libraries
+# if needed to ``FFMPEG_LIBRARIES`` if ffmpeg ever changes...
+
+#=============================================================================
+# Copyright: 1993-2008 Ken Martin, Will Schroeder, Bill Lorensen
+#
+# Distributed under the OSI-approved BSD License (the "License");
+# see accompanying file Copyright.txt for details.
+#
+# This software is distributed WITHOUT ANY WARRANTY; without even the
+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the License for more information.
+#=============================================================================
+# (To distribute this file outside of YCM, substitute the full
+#  License text for the above reference.)
+
+# Originally from VTK project
+
+
+find_path(FFMPEG_INCLUDE_DIR1 avformat.h
+  $ENV{FFMPEG_DIR}
+  $ENV{FFMPEG_DIR}/ffmpeg
+  $ENV{FFMPEG_DIR}/libavformat
+  $ENV{FFMPEG_DIR}/include/libavformat
+  $ENV{FFMPEG_DIR}/include/ffmpeg
+  /usr/local/include/ffmpeg
+  /usr/include/ffmpeg
+  /usr/include/libavformat
+  /usr/include/ffmpeg/libavformat
+  /usr/local/include/libavformat
+)
+
+find_path(FFMPEG_INCLUDE_DIR2 avutil.h
+  $ENV{FFMPEG_DIR}
+  $ENV{FFMPEG_DIR}/ffmpeg
+  $ENV{FFMPEG_DIR}/libavutil
+  $ENV{FFMPEG_DIR}/include/libavutil
+  $ENV{FFMPEG_DIR}/include/ffmpeg
+  /usr/local/include/ffmpeg
+  /usr/include/ffmpeg
+  /usr/include/libavutil
+  /usr/include/ffmpeg/libavutil
+  /usr/local/include/libavutil
+)
+
+find_path(FFMPEG_INCLUDE_DIR3 avcodec.h
+  $ENV{FFMPEG_DIR}
+  $ENV{FFMPEG_DIR}/ffmpeg
+  $ENV{FFMPEG_DIR}/libavcodec
+  $ENV{FFMPEG_DIR}/include/libavcodec
+  $ENV{FFMPEG_DIR}/include/ffmpeg
+  /usr/local/include/ffmpeg
+  /usr/include/ffmpeg
+  /usr/include/libavcodec
+  /usr/include/ffmpeg/libavcodec
+  /usr/local/include/libavcodec
+)
+
+find_path(FFMPEG_INCLUDE_DIR4 swscale.h
+  $ENV{FFMPEG_DIR}
+  $ENV{FFMPEG_DIR}/ffmpeg
+  $ENV{FFMPEG_DIR}/libswscale
+  $ENV{FFMPEG_DIR}/include/libswscale
+  $ENV{FFMPEG_DIR}/include/ffmpeg
+  /usr/local/include/ffmpeg
+  /usr/include/ffmpeg
+  /usr/include/libswscale
+  /usr/include/ffmpeg/libswscale
+  /usr/local/include/libswscale
+)
+
+find_path(FFMPEG_INCLUDE_DIR5 avdevice.h
+  $ENV{FFMPEG_DIR}
+  $ENV{FFMPEG_DIR}/ffmpeg
+  $ENV{FFMPEG_DIR}/libavdevice
+  $ENV{FFMPEG_DIR}/include/libavdevice
+  $ENV{FFMPEG_DIR}/include/ffmpeg
+  /usr/local/include/ffmpeg
+  /usr/include/ffmpeg
+  /usr/include/libavdevice
+  /usr/include/ffmpeg/libavdevice
+  /usr/local/include/libavdevice
+)
+
+if(FFMPEG_INCLUDE_DIR1)
+  if(FFMPEG_INCLUDE_DIR2)
+    if(FFMPEG_INCLUDE_DIR3)
+      set(FFMPEG_INCLUDE_DIR ${FFMPEG_INCLUDE_DIR1}
+                             ${FFMPEG_INCLUDE_DIR2}
+                             ${FFMPEG_INCLUDE_DIR3})
+    endif()
+  endif()
+endif()
+
+if(FFMPEG_INCLUDE_DIR4)
+  set(FFMPEG_INCLUDE_DIR ${FFMPEG_INCLUDE_DIR}
+                         ${FFMPEG_INCLUDE_DIR4})
+endif()
+
+if(FFMPEG_INCLUDE_DIR5)
+  set(FFMPEG_INCLUDE_DIR ${FFMPEG_INCLUDE_DIR}
+                         ${FFMPEG_INCLUDE_DIR5}
+                         ${FFMPEG_INCLUDE_DIR5}/..)
+endif()
+
+find_library(FFMPEG_avformat_LIBRARY avformat
+  $ENV{FFMPEG_DIR}
+  $ENV{FFMPEG_DIR}/lib
+  $ENV{FFMPEG_DIR}/libavformat
+  /usr/local/lib
+  /usr/lib
+)
+
+find_library(FFMPEG_avcodec_LIBRARY avcodec
+  $ENV{FFMPEG_DIR}
+  $ENV{FFMPEG_DIR}/lib
+  $ENV{FFMPEG_DIR}/libavcodec
+  /usr/local/lib
+  /usr/lib
+)
+
+find_library(FFMPEG_avutil_LIBRARY avutil
+  $ENV{FFMPEG_DIR}
+  $ENV{FFMPEG_DIR}/lib
+  $ENV{FFMPEG_DIR}/libavutil
+  /usr/local/lib
+  /usr/lib
+)
+
+if(NOT DISABLE_SWSCALE)
+  find_library(FFMPEG_swscale_LIBRARY swscale
+    $ENV{FFMPEG_DIR}
+    $ENV{FFMPEG_DIR}/lib
+    $ENV{FFMPEG_DIR}/libswscale
+    /usr/local/lib
+    /usr/lib
+  )
+endif(NOT DISABLE_SWSCALE)
+
+find_library(FFMPEG_avdevice_LIBRARY avdevice
+  $ENV{FFMPEG_DIR}
+  $ENV{FFMPEG_DIR}/lib
+  $ENV{FFMPEG_DIR}/libavdevice
+  /usr/local/lib
+  /usr/lib
+)
+
+find_library(_FFMPEG_z_LIBRARY_ z
+  $ENV{FFMPEG_DIR}
+  $ENV{FFMPEG_DIR}/lib
+  /usr/local/lib
+  /usr/lib
+)
+
+
+
+if(FFMPEG_INCLUDE_DIR)
+  if(FFMPEG_avformat_LIBRARY)
+    if(FFMPEG_avcodec_LIBRARY)
+      if(FFMPEG_avutil_LIBRARY)
+        set(FFMPEG_FOUND "YES")
+        set(FFMPEG_LIBRARIES ${FFMPEG_avformat_LIBRARY}
+                             ${FFMPEG_avcodec_LIBRARY}
+                             ${FFMPEG_avutil_LIBRARY}
+          )
+        if(FFMPEG_swscale_LIBRARY)
+          set(FFMPEG_LIBRARIES ${FFMPEG_LIBRARIES}
+                               ${FFMPEG_swscale_LIBRARY}
+          )
+        endif()
+        if(FFMPEG_avdevice_LIBRARY)
+          set(FFMPEG_LIBRARIES ${FFMPEG_LIBRARIES}
+                               ${FFMPEG_avdevice_LIBRARY}
+          )
+        endif()
+        if(_FFMPEG_z_LIBRARY_)
+          set( FFMPEG_LIBRARIES ${FFMPEG_LIBRARIES}
+                                ${_FFMPEG_z_LIBRARY_}
+          )
+        endif()
+      endif()
+    endif()
+  endif()
+endif()
+
+mark_as_advanced(
+  FFMPEG_INCLUDE_DIR
+  FFMPEG_INCLUDE_DIR1
+  FFMPEG_INCLUDE_DIR2
+  FFMPEG_INCLUDE_DIR3
+  FFMPEG_INCLUDE_DIR4
+  FFMPEG_INCLUDE_DIR5
+  FFMPEG_avformat_LIBRARY
+  FFMPEG_avcodec_LIBRARY
+  FFMPEG_avutil_LIBRARY
+  FFMPEG_swscale_LIBRARY
+  FFMPEG_avdevice_LIBRARY
+  _FFMPEG_z_LIBRARY_
+  )
+
+# Set package properties if FeatureSummary was included
+if(COMMAND set_package_properties)
+  set_package_properties(FFMPEG PROPERTIES DESCRIPTION "A complete, cross-platform solution to record, convert and stream audio and video")
+  set_package_properties(FFMPEG PROPERTIES URL "http://ffmpeg.org/")
+endif()

CMakeLists.txt

@@ -60,6 +60,8 @@ if(WIN32)
 else()
   if(LINUX)
     option(WITH_FFMPEG "Build with FFMPEG." ON)
+    # Builder beware: later versions of ffmpeg may break!
+    option(WITH_SYSTEM_FFMPEG "Build with the system's FFMPEG." OFF)
     option(WITH_TTY "Build with Linux TTY Input Support." OFF)
     option(WITH_PROFILING "Build with Profiling Support." OFF)
     option(WITH_GLES2 "Build with OpenGL ES 2.0 Support." ON)
@@ -287,6 +289,16 @@ elseif(LINUX)
   endif()
 
   if(WITH_FFMPEG)
+    if (WITH_SYSTEM_FFMPEG)
+      find_package("FFMPEG")
+      if(NOT FFMPEG_FOUND)
+        message(FATAL_ERROR "System ffmpeg not found! Either install the libraries or remove the argument, then try again.")
+      else()
+
+        message(STATUS "-- Warning! Your version of ffmpeg may be too high! If you want to use the system ffmpeg, clear your cmake cache and do not include the system ffmpeg argument.")
+        set(HAS_FFMPEG TRUE)
+      endif()
+    else()
       list(APPEND FFMPEG_CONFIGURE
         "${SM_EXTERN_DIR}/ffmpeg-linux/src/ffmpeg/configure"
         "--disable-programs"
@@ -317,6 +329,7 @@ elseif(LINUX)
         TEST_COMMAND ""
       )
       set(HAS_FFMPEG TRUE)
+    endif()
   else()
     set(HAS_FFMPEG FALSE)
   endif()

src/CMakeLists.txt

@@ -383,11 +383,25 @@ elseif(APPLE)
   )
 else() # Unix / Linux
   # TODO: Remember to find and locate the zip archive files.
+  if (HAS_FFMPEG)
+    if(WITH_SYSTEM_FFMPEG)
+      list(APPEND SMDATA_LINK_LIB
+        "${FFMPEG_avformat_LIBRARY}"
+        "${FFMPEG_avcodec_LIBRARY}"
+        "${FFMPEG_swscale_LIBRARY}"
+        "${FFMPEG_avutil_LIBRARY}"
+      )
+    else()
       list(APPEND SMDATA_LINK_LIB
         "${SM_EXTERN_DIR}/ffmpeg-linux/src/ffmpeg-build/libavformat/libavformat.a"
         "${SM_EXTERN_DIR}/ffmpeg-linux/src/ffmpeg-build/libavcodec/libavcodec.a"
         "${SM_EXTERN_DIR}/ffmpeg-linux/src/ffmpeg-build/libswscale/libswscale.a"
         "${SM_EXTERN_DIR}/ffmpeg-linux/src/ffmpeg-build/libavutil/libavutil.a"
+      )
+    endif()
+  endif()
+
+  list(APPEND SMDATA_LINK_LIB
     "${DL_LIBRARY}"
   )
 
@@ -476,12 +490,16 @@ if(NOT APPLE)
     )
   else()
     if (HAS_FFMPEG)
+      if (WITH_SYSTEM_FFMPEG)
+        list(APPEND SM_INCLUDE_DIRS "${FFMPEG_INCLUDE_DIR}")
+      else()
         add_dependencies("${SM_EXE_NAME}" "ffmpeg")
         list(APPEND SM_INCLUDE_DIRS
           "${SM_EXTERN_DIR}/ffmpeg-linux/src/ffmpeg"
           "${SM_EXTERN_DIR}/ffmpeg-linux/src/ffmpeg-build"
         )
       endif()
+    endif()
     if (HAS_GTK2)
       list(APPEND SM_INCLUDE_DIRS "${GTK2_INCLUDE_DIRS}")
     endif()