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+# vim: ts=2 sw=2
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+# - Try to find the required ffmpeg components(default: AVFORMAT, AVUTIL, AVCODEC)
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+#
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+# Once done this will define
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+# FFMPEG_FOUND - System has the all required components.
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+# FFMPEG_INCLUDE_DIRS - Include directory necessary for using the required components headers.
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+# FFMPEG_LIBRARIES - Link these to use the required ffmpeg components.
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+# FFMPEG_DEFINITIONS - Compiler switches required for using the required ffmpeg components.
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+#
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+# For each of the components it will additionaly set.
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+# - AVCODEC
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+# - AVDEVICE
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+# - AVFORMAT
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+# - AVUTIL
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+# - POSTPROCESS
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+# - SWSCALE
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+# the following variables will be defined
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+# <component>_FOUND - System has <component>
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+# <component>_INCLUDE_DIRS - Include directory necessary for using the <component> headers
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+# <component>_LIBRARIES - Link these to use <component>
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+# <component>_DEFINITIONS - Compiler switches required for using <component>
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+# <component>_VERSION - The components version
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+#
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+# Copyright (c) 2006, Matthias Kretz, <[email protected]>
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+# Copyright (c) 2008, Alexander Neundorf, <[email protected]>
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+# Copyright (c) 2011, Michael Jansen, <[email protected]>
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+#
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+# Redistribution and use is allowed according to the terms of the BSD license.
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+# For details see the accompanying COPYING-CMAKE-SCRIPTS file.
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+
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+include(FindPackageHandleStandardArgs)
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+
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+# The default components were taken from a survey over other FindFFMPEG.cmake files
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+if (NOT FFmpeg_FIND_COMPONENTS)
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+ set(FFmpeg_FIND_COMPONENTS AVCODEC AVFORMAT AVUTIL SWSCALE)
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+endif ()
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+
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+#
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+### Macro: set_component_found
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+#
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+# Marks the given component as found if both *_LIBRARIES AND *_INCLUDE_DIRS is present.
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+#
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+macro(set_component_found _component )
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+ if (${_component}_LIBRARIES AND ${_component}_INCLUDE_DIRS)
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+ # message(STATUS " - ${_component} found.")
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+ set(${_component}_FOUND TRUE)
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+ else ()
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+ # message(STATUS " - ${_component} not found.")
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+ endif ()
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+endmacro()
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+
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+#
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+### Macro: find_component
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+#
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+# Checks for the given component by invoking pkgconfig and then looking up the libraries and
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+# include directories.
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+#
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+macro(find_component _component _pkgconfig _library _header)
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+
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+ if (NOT WIN32)
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+ # use pkg-config to get the directories and then use these values
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+ # in the FIND_PATH() and FIND_LIBRARY() calls
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+ find_package(PkgConfig)
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+ if (PKG_CONFIG_FOUND)
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+ pkg_check_modules(PC_${_component} ${_pkgconfig})
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+ endif ()
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+ endif (NOT WIN32)
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+
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+ find_path(${_component}_INCLUDE_DIRS ${_header}
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+ HINTS
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+ ${PC_LIB${_component}_INCLUDEDIR}
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+ ${PC_LIB${_component}_INCLUDE_DIRS}
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+ PATH_SUFFIXES
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+ ffmpeg
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+ )
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+
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+ find_library(${_component}_LIBRARIES NAMES ${_library}
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+ HINTS
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+ ${PC_LIB${_component}_LIBDIR}
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+ ${PC_LIB${_component}_LIBRARY_DIRS}
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+ )
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+
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+ set(${_component}_DEFINITIONS ${PC_${_component}_CFLAGS_OTHER} CACHE STRING "The ${_component} CFLAGS.")
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+ set(${_component}_VERSION ${PC_${_component}_VERSION} CACHE STRING "The ${_component} version number.")
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+
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+ set_component_found(${_component})
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+
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+ mark_as_advanced(
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+ ${_component}_INCLUDE_DIRS
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+ ${_component}_LIBRARIES
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+ ${_component}_DEFINITIONS
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+ ${_component}_VERSION)
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+
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+endmacro()
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+
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+
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+# Check for cached results. If there are skip the costly part.
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+if (NOT FFMPEG_LIBRARIES)
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+
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+ # Check for all possible component.
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+ find_component(AVCODEC libavcodec avcodec libavcodec/avcodec.h)
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+ find_component(AVFORMAT libavformat avformat libavformat/avformat.h)
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+ find_component(AVDEVICE libavdevice avdevice libavdevice/avdevice.h)
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+ find_component(AVUTIL libavutil avutil libavutil/avutil.h)
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+ find_component(SWSCALE libswscale swscale libswscale/swscale.h)
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+ find_component(POSTPROC libpostproc postproc libpostproc/postprocess.h)
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+
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+ # Check if the required components were found and add their stuff to the FFMPEG_* vars.
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+ foreach (_component ${FFmpeg_FIND_COMPONENTS})
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+ if (${_component}_FOUND)
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+ # message(STATUS "Required component ${_component} present.")
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+ set(FFMPEG_LIBRARIES ${FFMPEG_LIBRARIES} ${${_component}_LIBRARIES})
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+ set(FFMPEG_DEFINITIONS ${FFMPEG_DEFINITIONS} ${${_component}_DEFINITIONS})
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+ list(APPEND FFMPEG_INCLUDE_DIRS ${${_component}_INCLUDE_DIRS})
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+ else ()
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+ # message(STATUS "Required component ${_component} missing.")
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+ endif ()
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+ endforeach ()
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+
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+ # Build the include path with duplicates removed.
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+ if (FFMPEG_INCLUDE_DIRS)
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+ list(REMOVE_DUPLICATES FFMPEG_INCLUDE_DIRS)
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+ endif ()
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+
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+ # cache the vars.
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+ set(FFMPEG_INCLUDE_DIRS ${FFMPEG_INCLUDE_DIRS} CACHE STRING "The FFmpeg include directories." FORCE)
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+ set(FFMPEG_LIBRARIES ${FFMPEG_LIBRARIES} CACHE STRING "The FFmpeg libraries." FORCE)
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+ set(FFMPEG_DEFINITIONS ${FFMPEG_DEFINITIONS} CACHE STRING "The FFmpeg cflags." FORCE)
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+
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+ mark_as_advanced(FFMPEG_INCLUDE_DIRS
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+ FFMPEG_LIBRARIES
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+ FFMPEG_DEFINITIONS)
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+
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+endif ()
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+
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+# Now set the noncached _FOUND vars for the components.
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+foreach (_component AVCODEC AVDEVICE AVFORMAT AVUTIL POSTPROCESS SWSCALE)
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+ set_component_found(${_component})
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+endforeach ()
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+
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+# Compile the list of required vars
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+set(_FFmpeg_REQUIRED_VARS FFMPEG_LIBRARIES FFMPEG_INCLUDE_DIRS)
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+foreach (_component ${FFmpeg_FIND_COMPONENTS})
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+ list(APPEND _FFmpeg_REQUIRED_VARS ${_component}_LIBRARIES ${_component}_INCLUDE_DIRS)
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+endforeach ()
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+
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+# Give a nice error message if some of the required vars are missing.
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+find_package_handle_standard_args(FFmpeg DEFAULT_MSG ${_FFmpeg_REQUIRED_VARS})
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Ivan Savenko