1 files changed, 65 insertions, 0 deletions
diff --git a/CMakeFFmpegLibavMacros.cmake b/CMakeFFmpegLibavMacros.cmake
new file mode 100644
index 0000000..06105c6
--- /dev/null
+++ b/CMakeFFmpegLibavMacros.cmake
@@ -0,0 +1,65 @@
+#-------------------------------------------------------------------
+# FindFFmpeg.cmake and FindLibAV.cmake are dependent on this file.
+#
+# Redistribution and use is allowed according to the terms of the BSD license.
+# For details see the accompanying COPYING-CMAKE-SCRIPTS file
+#
+#-------------------------------------------------------------------
+
+### Macro: set_component_found
+#
+# Marks the given component as found if both *_LIBRARIES AND *_INCLUDE_DIRS is present.
+#
+macro(set_component_found _component )
+  if(${_component}_LIBRARIES AND ${_component}_INCLUDE_DIRS)
+    # message(STATUS "  - ${_component} found.")
+    set(${_component}_FOUND TRUE)
+  else()
+    # message(STATUS "  - ${_component} not found.")
+  endif()
+endmacro()
+
+#
+### Macro: find_component
+#
+# Finds each component's library file and include directory, and sets
+# *_LIBRARIES and *_INCLUDE_DIRS accordingly. Additionally detects each
+# component's version and sets *_VERSION_STRING.
+#
+macro(find_component _component _library _header _version)
+  find_path(${_component}_INCLUDE_DIRS ${_header}
+    PATH_SUFFIXES
+      ffmpeg
+      libav
+      include
+  )
+
+  find_library(${_component}_LIBRARIES
+    NAMES ${_library}
+    PATH_SUFFIXES
+      lib
+  )
+
+  if(${_component}_INCLUDE_DIRS AND EXISTS "${${_component}_INCLUDE_DIRS}/${_version}")
+    file(STRINGS "${${_component}_INCLUDE_DIRS}/${_version}" ${_component}_VERSION_MAJOR_LINE REGEX "^#define[ \t]+LIB${_component}_VERSION_MAJOR[ \t]+[0-9]+$")
+    file(STRINGS "${${_component}_INCLUDE_DIRS}/${_version}" ${_component}_VERSION_MINOR_LINE REGEX "^#define[ \t]+LIB${_component}_VERSION_MINOR[ \t]+[0-9]+$")
+    file(STRINGS "${${_component}_INCLUDE_DIRS}/${_version}" ${_component}_VERSION_PATCH_LINE REGEX "^#define[ \t]+LIB${_component}_VERSION_MICRO[ \t]+[0-9]+$")
+    string(REGEX REPLACE "^#define[ \t]+LIB${_component}_VERSION_MAJOR[ \t]+([0-9]+)$" "\\1" ${_component}_VERSION_MAJOR "${${_component}_VERSION_MAJOR_LINE}")
+    string(REGEX REPLACE "^#define[ \t]+LIB${_component}_VERSION_MINOR[ \t]+([0-9]+)$" "\\1" ${_component}_VERSION_MINOR "${${_component}_VERSION_MINOR_LINE}")
+    string(REGEX REPLACE "^#define[ \t]+LIB${_component}_VERSION_MICRO[ \t]+([0-9]+)$" "\\1" ${_component}_VERSION_PATCH "${${_component}_VERSION_PATCH_LINE}")
+    set(${_component}_VERSION_STRING ${${_component}_VERSION_MAJOR}.${${_component}_VERSION_MINOR}.${${_component}_VERSION_PATCH})
+    unset(${_component}_VERSION_MAJOR_LINE)
+    unset(${_component}_VERSION_MINOR_LINE)
+    unset(${_component}_VERSION_PATCH_LINE)
+    unset(${_component}_VERSION_MAJOR)
+    unset(${_component}_VERSION_MINOR)
+    unset(${_component}_VERSION_PATCH)
+  endif()
+
+  find_package_handle_standard_args(${_component}
+    REQUIRED_VARS ${_component}_LIBRARIES ${_component}_INCLUDE_DIRS
+    VERSION_VAR ${_component}_VERSION_STRING
+  )
+
+  set_component_found(${_component})
+endmacro()