[kdelibs] cmake/modules: Rewritten FindFFmpeg.cmake
Michael Jansen
kde at michael-jansen.biz
Wed Jun 29 23:25:47 CEST 2011
Git commit b93c97454b36b5498e9abcec6beb1daf8839e3d7 by Michael Jansen.
Committed on 29/06/2011 at 23:26.
Pushed by mjansen into branch 'master'.
Rewritten FindFFmpeg.cmake
- Checks for all modules individually (pkgconfig)
- Supports components
- Provides versions
- Supports all ffmpeg modules.
CCMAIL: kde-buildsystem at kde.org
M +132 -100 cmake/modules/FindFFmpeg.cmake
http://commits.kde.org/kdelibs/b93c97454b36b5498e9abcec6beb1daf8839e3d7
diff --git a/cmake/modules/FindFFmpeg.cmake b/cmake/modules/FindFFmpeg.cmake
index d6259b0..526be5f 100644
--- a/cmake/modules/FindFFmpeg.cmake
+++ b/cmake/modules/FindFFmpeg.cmake
@@ -1,116 +1,148 @@
-# - Try to find ffmpeg
+# vim: ts=2 sw=2
+# - Try to find the required ffmpeg components(default: AVFORMAT, AVUTIL, AVCODEC)
+#
# Once done this will define
+# FFMPEG_FOUND - System has the all required components.
+# FFMPEG_INCLUDE_DIRS - Include directory necessary for using the required components headers.
+# FFMPEG_LIBRARIES - Link these to use the required ffmpeg components.
+# FFMPEG_DEFINITIONS - Compiler switches required for using the required ffmpeg components.
+#
+# For each of the components it will additionaly set.
+# - AVCODEC
+# - AVDEVICE
+# - AVFORMAT
+# - AVUTIL
+# - POSTPROCESS
+# - 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>_DEFINITIONS - Compiler switches required for using <component>
+# <component>_VERSION - The components version
#
-# FFMPEG_FOUND - system has ffmpeg
-# FFMPEG_INCLUDE_DIR - Include directory necessary for using the ffmpeg headers
-# FFMPEG_LIBRARIES - Link these to use ffmpeg
-# FFMPEG_DEFINITIONS - Compiler switches required for using ffmpeg
-
# Copyright (c) 2006, Matthias Kretz, <kretz at kde.org>
# Copyright (c) 2008, Alexander Neundorf, <neundorf at kde.org>
+# Copyright (c) 2011, Michael Jansen, <kde at michael-jansen.biz>
#
# Redistribution and use is allowed according to the terms of the BSD license.
# For details see the accompanying COPYING-CMAKE-SCRIPTS file.
+include(FindPackageHandleStandardArgs)
-if (FFMPEG_LIBRARIES)
-
- # in cache already
- set(FFMPEG_FOUND TRUE)
-
-else (FFMPEG_LIBRARIES)
-
-if (NOT WIN32)
- # use pkg-config to get the directories and then use these values
- # in the FIND_PATH() and FIND_LIBRARY() calls
- find_package(PkgConfig)
- pkg_check_modules(PC_LIBAVCODEC libavcodec)
- set(FFMPEG_DEFINITIONS ${PC_LIBAVCODEC_CFLAGS_OTHER})
-
-endif (NOT WIN32)
-
- #
- # #include <libXXXX/XXXX.h> is the new style for FFMPEG headers
- # This has been verified at least since 0.4.9
- # Please do not change to the old format, since this will break for
- # people who are using newer versions. Instead, upgrade your ffmpeg
- # installation.
- #
- find_path(FFMPEG_INCLUDE_DIR libavcodec/avcodec.h
- HINTS
- ${PC_LIBAVCODEC_INCLUDEDIR}
- ${PC_LIBAVCODEC_INCLUDE_DIRS}
- )
-
- # also search for the old style include dir, just for the purpose
- # of giving a useful error message if an old libavcodec is installed
- # and the user might wonder why it is not found
- find_path(FFMPEG_INCLUDE_DIR_OLD_STYLE ffmpeg/avcodec.h
- HINTS
- ${PC_LIBAVCODEC_INCLUDEDIR}
- ${PC_LIBAVCODEC_INCLUDE_DIRS}
- )
+# The default components were taken from a survey over other FindFFMPEG.cmake files
+if (NOT FFmpeg_FIND_COMPONENTS)
+ set(FFmpeg_FIND_COMPONENTS AVCODEC AVFORMAT AVUTIL)
+endif ()
- find_library(AVCODEC_LIBRARIES NAMES avcodec
- HINTS
- ${PC_LIBAVCODEC_LIBDIR}
- ${PC_LIBAVCODEC_LIBRARY_DIRS}
- )
+#
+### Macro: set_component_found
+#
+# Marks the given component as found if both *_LIBRARIES AND *_INCLUDE_DIRS is present.
+#
+macro(set_component_found _component )
+ if (${_component}_LIBRARIES AND ${_component}_INCLUDE_DIRS)
+ # message(STATUS " - ${_component} found.")
+ set(${_component}_FOUND TRUE)
+ else ()
+ # message(STATUS " - ${_component} not found.")
+ endif ()
+endmacro()
- find_library(AVFORMAT_LIBRARIES NAMES avformat
+#
+### Macro: find_component
+#
+# Checks for the given component by invoking pkgconfig and then looking up the libraries and
+# include directories.
+#
+macro(find_component _component _pkgconfig _library _header)
+
+ if (NOT WIN32)
+ # use pkg-config to get the directories and then use these values
+ # in the FIND_PATH() and FIND_LIBRARY() calls
+ find_package(PkgConfig)
+ if (PKG_CONFIG_FOUND)
+ pkg_check_modules(PC_${_component} ${_pkgconfig})
+ endif ()
+ endif (NOT WIN32)
+
+ find_path(${_component}_INCLUDE_DIRS ${_header}
HINTS
- ${PC_LIBAVCODEC_LIBDIR}
- ${PC_LIBAVCODEC_LIBRARY_DIRS}
+ ${PC_LIB${_component}_INCLUDEDIR}
+ ${PC_LIB${_component}_INCLUDE_DIRS}
+ PATH_SUFFIXES
+ ffmpeg
)
- find_library(AVUTIL_LIBRARIES NAMES avutil
- HINTS
- ${PC_LIBAVCODEC_LIBDIR}
- ${PC_LIBAVCODEC_LIBRARY_DIRS}
+ find_library(${_component}_LIBRARIES NAMES ${_library}
+ HINTS
+ ${PC_LIB${_component}_LIBDIR}
+ ${PC_LIB${_component}_LIBRARY_DIRS}
)
-
-
- set(FFMPEG_LIBRARIES )
- if (AVCODEC_LIBRARIES)
- set(FFMPEG_LIBRARIES ${FFMPEG_LIBRARIES} ${AVCODEC_LIBRARIES})
- endif (AVCODEC_LIBRARIES)
-
- if (AVFORMAT_LIBRARIES)
- set(FFMPEG_LIBRARIES ${FFMPEG_LIBRARIES} ${AVFORMAT_LIBRARIES})
- endif (AVFORMAT_LIBRARIES)
-
- if (AVUTIL_LIBRARIES)
- set(FFMPEG_LIBRARIES ${FFMPEG_LIBRARIES} ${AVUTIL_LIBRARIES})
- endif (AVUTIL_LIBRARIES)
-
- if (FFMPEG_LIBRARIES AND FFMPEG_INCLUDE_DIR)
- set(FFMPEG_FOUND TRUE)
- endif (FFMPEG_LIBRARIES AND FFMPEG_INCLUDE_DIR)
-
- if (FFMPEG_FOUND)
- if (NOT FFmpeg_FIND_QUIETLY)
- message(STATUS "Found FFMPEG: ${FFMPEG_LIBRARIES} ${FFMPEG_INCLUDE_DIR}")
- endif (NOT FFmpeg_FIND_QUIETLY)
- else (FFMPEG_FOUND)
- # only an old libavcodec was found ?
- if (FFMPEG_INCLUDE_DIR_OLD_STYLE AND NOT FFMPEG_INCLUDE_DIR AND NOT FFmpeg_FIND_QUIETLY)
- message(STATUS "Found old version of libavcodec, but a newer version is required.")
- endif (FFMPEG_INCLUDE_DIR_OLD_STYLE AND NOT FFMPEG_INCLUDE_DIR AND NOT FFmpeg_FIND_QUIETLY)
-
- if (FFmpeg_FIND_REQUIRED)
- message(FATAL_ERROR "Could NOT find FFMPEG")
- else (FFmpeg_FIND_REQUIRED)
- if (NOT FFmpeg_FIND_QUIETLY)
- message(STATUS "Could NOT find FFMPEG")
- endif (NOT FFmpeg_FIND_QUIETLY)
- endif (FFmpeg_FIND_REQUIRED)
- endif (FFMPEG_FOUND)
-
- mark_as_advanced(AVCODEC_LIBRARIES
- AVFORMAT_LIBRARIES
- AVUTIL_LIBRARIES
- FFMPEG_INCLUDE_DIR
- FFMPEG_INCLUDE_DIR_OLD_STYLE)
-
-endif (FFMPEG_LIBRARIES)# AND FFMPEG_DEFINITIONS)
+ set(${_component}_DEFINITIONS ${PC_${_component}_CFLAGS_OTHER} CACHE STRING "The ${_component} CFLAGS.")
+ set(${_component}_VERSION ${PC_${_component}_VERSION} CACHE STRING "The ${_component} version number.")
+
+ set_component_found(${_component})
+
+ mark_as_advanced(
+ ${_component}_INCLUDE_DIRS
+ ${_component}_LIBRARIES
+ ${_component}_DEFINITIONS
+ ${_component}_VERSION)
+
+endmacro()
+
+
+# Check for cached results. If there are skip the costly part.
+if (NOT FFMPEG_LIBRARIES)
+
+ # Check for all possible component.
+ find_component(AVCODEC libavcodec avcodec libavcodec/avcodec.h)
+ find_component(AVFORMAT libavformat avformat libavformat/avformat.h)
+ find_component(AVDEVICE libavdevice avdevice libavdevice/avdevice.h)
+ find_component(AVUTIL libavutil avutil libavutil/avutil.h)
+ find_component(SWSCALE libswscale swscale libswscale/swscale.h)
+ find_component(POSTPROC libpostproc postproc libpostproc/postprocess.h)
+
+ # Check if the required components were found and add their stuff to the FFMPEG_* vars.
+ foreach (_component ${FFmpeg_FIND_COMPONENTS})
+ if (${_component}_FOUND)
+ # message(STATUS "Required component ${_component} present.")
+ set(FFMPEG_LIBRARIES ${FFMPEG_LIBRARIES} ${${_component}_LIBRARIES})
+ set(FFMPEG_DEFINITIONS ${FFMPEG_DEFINITIONS} ${${_component}_DEFINITIONS})
+ list(APPEND FFMPEG_INCLUDE_DIRS ${${_component}_INCLUDE_DIRS})
+ else ()
+ # message(STATUS "Required component ${_component} missing.")
+ endif ()
+ endforeach ()
+
+ # Build the include path with duplicates removed.
+ if (FFMPEG_INCLUDE_DIRS)
+ list(REMOVE_DUPLICATES FFMPEG_INCLUDE_DIRS)
+ endif ()
+
+ # cache the vars.
+ set(FFMPEG_INCLUDE_DIRS ${FFMPEG_INCLUDE_DIRS} CACHE STRING "The FFmpeg include directories." FORCE)
+ set(FFMPEG_LIBRARIES ${FFMPEG_LIBRARIES} CACHE STRING "The FFmpeg libraries." FORCE)
+ set(FFMPEG_DEFINITIONS ${FFMPEG_DEFINITIONS} CACHE STRING "The FFmpeg cflags." FORCE)
+
+ mark_as_advanced(FFMPEG_INCLUDE_DIRS
+ FFMPEG_LIBRARIES
+ FFMPEG_DEFINITIONS)
+
+endif ()
+
+# Now set the noncached _FOUND vars for the components.
+foreach (_component AVCODEC AVDEVICE AVFORMAT AVUTIL POSTPROCESS SWSCALE)
+ set_component_found(${_component})
+endforeach ()
+
+# Compile the list of required vars
+set(_FFmpeg_REQUIRED_VARS FFMPEG_LIBRARIES FFMPEG_INCLUDE_DIRS)
+foreach (_component ${FFmpeg_FIND_COMPONENTS})
+ list(APPEND _FFmpeg_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(FFmpeg DEFAULT_MSG ${_FFmpeg_REQUIRED_VARS})
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