added libav to cmake

FindLibAV.cmake

@@ -0,0 +1,87 @@
+# vim: ts=2 sw=2
+# - Try to find the required libav components(default: AVFORMAT, AVUTIL, AVCODEC)
+#
+# Once done this will define
+#  LIBAV_FOUND         - System has the all required components.
+#  LIBAV_INCLUDE_DIRS  - Include directory necessary for using the required components headers.
+#  LIBAV_LIBRARIES     - Link these to use the required libav components.
+#
+# For each of the components it will additionally set.
+#   - AVCODEC
+#   - AVDEVICE
+#   - AVFILTER
+#   - AVFORMAT
+#   - AVRESAMPLE
+#   - AVUTIL
+#   - SWSCALE
+# the following variables will be defined
+#  <component>_FOUND          - System has <component>
+#  <component>_INCLUDE_DIRS   - Include directory necessary for using the <component> headers
+#  <component>_LIBRARIES      - Link these to use <component>
+#  <component>_VERSION_STRING - The component's version
+#
+# Copyright (c) 2006, Matthias Kretz, <kretz@kde.org>
+# Copyright (c) 2008, Alexander Neundorf, <neundorf@kde.org>
+# Copyright (c) 2011, Michael Jansen, <kde@michael-jansen.biz>
+# Copyright (c) 2013,2015 Stephen Baker <baker.stephen.e@gmail.com>
+# Copyright (c) 2015, Alexander Bessman
+#
+# Redistribution and use is allowed according to the terms of the BSD license.
+# For details see the accompanying COPYING-CMAKE-SCRIPTS file.
+
+include(FindPackageHandleStandardArgs)
+include(${CMAKE_CURRENT_LIST_DIR}/CMakeFFmpegLibavMacros.cmake)
+
+# The default components were taken from a survey over other FindLIBAV.cmake files
+if(NOT LibAV_FIND_COMPONENTS)
+  set(LibAV_FIND_COMPONENTS AVCODEC AVFORMAT AVUTIL)
+endif()
+
+# Check for cached results. If there are skip the costly part.
+if(NOT LIBAV_LIBRARIES)
+
+  # Check for all possible component.
+  find_component(AVCODEC  avcodec  libavcodec/avcodec.h   libavcodec/version.h)
+  find_component(AVFORMAT avformat libavformat/avformat.h libavformat/version.h)
+  find_component(AVDEVICE avdevice libavdevice/avdevice.h libavdevice/version.h)
+  find_component(AVFILTER avfilter libavfilter/avfilter.h libavfilter/version.h)
+  find_component(AVRESAMPLE avresample libavresample/avresample.h libavresample/version.h)
+  find_component(AVUTIL   avutil   libavutil/avutil.h     libavutil/version.h)
+  find_component(SWSCALE  swscale  libswscale/swscale.h   libswscale/version.h)
+
+  # Check if the required components were found and add their stuff to the LIBAV_* vars.
+  foreach(_component ${LibAV_FIND_COMPONENTS})
+    if(${_component}_FOUND)
+      # message(STATUS "Required component ${_component} present.")
+      set(LIBAV_LIBRARIES   ${LIBAV_LIBRARIES}   ${${_component}_LIBRARIES})
+      list(APPEND LIBAV_INCLUDE_DIRS ${${_component}_INCLUDE_DIRS})
+    else()
+      # message(STATUS "Required component ${_component} missing.")
+    endif()
+  endforeach()
+
+  # Build the include path with duplicates removed.
+  if(LIBAV_INCLUDE_DIRS)
+    list(REMOVE_DUPLICATES LIBAV_INCLUDE_DIRS)
+  endif()
+
+  # cache the vars.
+  set(LIBAV_INCLUDE_DIRS ${LIBAV_INCLUDE_DIRS} CACHE STRING "The LibAV include directories." FORCE)
+  set(LIBAV_LIBRARIES    ${LIBAV_LIBRARIES}    CACHE STRING "The LibAV libraries." FORCE)
+
+  mark_as_advanced(LIBAV_INCLUDE_DIRS LIBAV_LIBRARIES)
+endif()
+
+# Now set the noncached _FOUND vars for the components.
+foreach(_component AVCODEC AVDEVICE AVFILTER AVFORMAT AVRESAMPLE AVUTIL SWSCALE)
+  set_component_found(${_component})
+endforeach()
+
+# Compile the list of required vars
+set(_LibAV_REQUIRED_VARS LIBAV_LIBRARIES LIBAV_INCLUDE_DIRS)
+foreach(_component ${LibAV_FIND_COMPONENTS})
+  list(APPEND _LibAV_REQUIRED_VARS ${_component}_LIBRARIES ${_component}_INCLUDE_DIRS)
+endforeach()
+
+# Give a nice error message if some of the required vars are missing.
+find_package_handle_standard_args(LibAV DEFAULT_MSG ${_LibAV_REQUIRED_VARS})