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#.rst:
# FindFFmpeg
# ----------
#
# Try to find the required ffmpeg components (default: AVFORMAT, AVUTIL, AVCODEC)
#
# Next variables can be used to hint FFmpeg libs search:
#
# ::
#
# PC_<component>_LIBRARY_DIRS
# PC_FFMPEG_LIBRARY_DIRS
# PC_<component>_INCLUDE_DIRS
# PC_FFMPEG_INCLUDE_DIRS
#
# 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_LIBRARY_DIRS - Link directories
# FFMPEG_DEFINITIONS - Compiler switches required for using the required ffmpeg components.
#
# For each of the components it will additionally set.
#
# ::
#
# AVCODEC
# AVDEVICE
# AVFORMAT
# AVFILTER
# AVUTIL
# POSTPROC
# SWSCALE
#
# the following variables will be defined
#
# ::
#
# <component>_FOUND - System has <component>
# FFMPEG_<component>_FOUND - System has <component> (as checked by FHSPA)
# <component>_INCLUDE_DIRS - Include directory necessary for using the <component> headers
# <component>_LIBRARIES - Link these to use <component>
# <component>_LIBRARY_DIRS - Link directories
# <component>_DEFINITIONS - Compiler switches required for using <component>
# <component>_VERSION - The components version
#
# the following import targets is created
#
# ::
#
# FFmpeg::FFmpeg - for all components
# FFmpeg::<component> - where <component> in lower case (FFmpeg::avcodec) for each components
#
# 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) 2017, Alexander Drozdov, <adrozdoff@gmail.com>
#
# Redistribution and use is allowed according to the terms of the BSD license.
# For details see the accompanying COPYING-CMAKE-SCRIPTS file.
include(FindPackageHandleStandardArgs)
# 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 ()
#
### 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)
set(${CMAKE_FIND_PACKAGE_NAME}_${_component}_FOUND TRUE)
else ()
# message(STATUS " - ${_component} not found.")
endif ()
endmacro()
find_package(PkgConfig QUIET)
if (NOT PKG_CONFIG_FOUND AND NOT FFMPEG_DIR)
set(FFMPEG_DIR "/usr/local")
endif()
#
### Macro: find_component
#
# Checks for the given component by invoking pkgconfig and then looking up the libraries and
# include directories.
#
macro(find_component _component _pkgconfig _library _header)
# use pkg-config to get the directories and then use these values
# in the FIND_PATH() and FIND_LIBRARY() calls
if (PKG_CONFIG_FOUND AND NOT FFMPEG_DIR)
pkg_check_modules(PC_${_component} ${_pkgconfig})
endif ()
if (FFMPEG_DIR OR FFMPEG_ROOT)
set(__find_ffmpeg_backup_root_dir "${CMAKE_FIND_ROOT_PATH}")
endif()
if(FFMPEG_DIR)
list(APPEND CMAKE_FIND_ROOT_PATH "${FFMPEG_DIR}")
endif()
if(FFMPEG_ROOT)
list(APPEND CMAKE_FIND_ROOT_PATH "${FFMPEG_ROOT}")
endif()
find_path(${_component}_INCLUDE_DIRS ${_header}
HINTS
${PC_${_component}_INCLUDEDIR}
${PC_${_component}_INCLUDE_DIRS}
${PC_FFMPEG_INCLUDE_DIRS}
PATHS
${FFMPEG_DIR}
PATH_SUFFIXES
ffmpeg include
)
find_library(${_component}_LIBRARY NAMES ${PC_${_component}_LIBRARIES} ${_library}
HINTS
${PC_${_component}_LIBDIR}
${PC_${_component}_LIBRARY_DIRS}
${PC_FFMPEG_LIBRARY_DIRS}
PATHS
${FFMPEG_DIR}
PATH_SUFFIXES
lib
)
if(FFMPEG_DIR OR FFMPEG_ROOT)
set(CMAKE_FIND_ROOT_PATH "${__find_ffmpeg_backup_root_dir}")
endif()
get_filename_component(${_component}_LIBRARY_DIR_FROM_FIND ${${_component}_LIBRARY} DIRECTORY)
get_filename_component(${_component}_LIBRARY_FROM_FIND ${${_component}_LIBRARY} NAME)
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}_LIBRARY_DIRS ${${_component}_LIBRARY_DIR_FROM_FIND} CACHE STRING "The ${_component} library dirs.")
set(${_component}_LIBRARIES ${${_component}_LIBRARY_FROM_FIND} CACHE STRING "The ${_component} libraries.")
# message("Libs" ${FFMPEG_DIR} ${${_component}_LIBRARIES} ${${_component}_LIBRARY_DIRS})
# message(STATUS "L0: ${${_component}_LIBRARIES}")
# message(STATUS "L1: ${PC_${_component}_LIBRARIES}")
# message(STATUS "L2: ${_library}")
# message(STATUS "L3: ${${_component}_LIBRARY}")
# message(STATUS "L4: ${${_component}_LIBRARY_DIRS}")
set_component_found(${_component})
mark_as_advanced(
${_component}_LIBRARY
${_component}_INCLUDE_DIRS
${_component}_LIBRARY_DIRS
${_component}_LIBRARIES
${_component}_DEFINITIONS
${_component}_VERSION)
endmacro()
# Clear the previously cached variables, because they are recomputed every time
# the Find script is included.
set(FFMPEG_INCLUDE_DIRS "")
set(FFMPEG_LIBRARIES "")
set(FFMPEG_DEFINITIONS "")
set(FFMPEG_LIBRARY_DIRS "")
# Function parses package config file to find the static library dependencies
# and adds them to the target library.
function(__ffmpeg_internal_set_dependencies lib)
set(PC_FILE ${FFMPEG_DIR}/lib/pkgconfig/lib${lib}.pc)
if(EXISTS ${PC_FILE})
file(READ ${PC_FILE} pcfile)
string(REGEX REPLACE ".*Libs:([A-Za-z0-9_. \${}-]+).*" "\\1" out "${pcfile}")
string(REGEX MATCHALL "\\-l[a-z0-9_-]+" libs_dependency ${out})
string(REGEX MATCHALL "[A-Za-z0-9_-]+\\.lib" libs_dependency_lib ${out})
string(REGEX REPLACE ".*Libs.private:([A-Za-z0-9_. \${}-]+).*" "\\1" out "${pcfile}")
string(REGEX MATCHALL "\\-l[a-z0-9_-]+" libs_private_dependency ${out})
string(REGEX MATCHALL "[A-Za-z0-9_-]+\\.lib" libs_private_dependency_lib ${out})
list(APPEND no_sufix ${libs_dependency} ${libs_private_dependency})
list(APPEND lib_sufix ${libs_dependency_lib} ${libs_private_dependency_lib})
foreach(d ${no_sufix})
string(REGEX REPLACE "\\-l" "" d ${d})
if(NOT ${lib} MATCHES ${d})
target_link_libraries(FFmpeg::${lib} INTERFACE ${d})
endif()
endforeach()
foreach(d ${lib_sufix})
string(REGEX REPLACE "\\.lib" "" d ${d})
target_link_libraries(FFmpeg::${lib} INTERFACE ${d})
endforeach()
endif()
endfunction()
# 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(AVFILTER libavfilter avfilter libavfilter/avfilter.h)
find_component(SWSCALE libswscale swscale libswscale/swscale.h)
find_component(POSTPROC libpostproc postproc libpostproc/postprocess.h)
find_component(SWRESAMPLE libswresample swresample libswresample/swresample.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 "Libs: ${${_component}_LIBRARIES} | ${PC_${_component}_LIBRARIES}")
# message(STATUS "Required component ${_component} present.")
set(FFMPEG_LIBRARIES ${FFMPEG_LIBRARIES} ${${_component}_LIBRARY} ${${_component}_LIBRARIES})
set(FFMPEG_DEFINITIONS ${FFMPEG_DEFINITIONS} ${${_component}_DEFINITIONS})
list(APPEND FFMPEG_INCLUDE_DIRS ${${_component}_INCLUDE_DIRS})
list(APPEND FFMPEG_LIBRARY_DIRS ${${_component}_LIBRARY_DIRS})
string(TOLOWER ${_component} _lowerComponent)
if (NOT TARGET FFmpeg::${_lowerComponent})
add_library(FFmpeg::${_lowerComponent} INTERFACE IMPORTED)
set_target_properties(FFmpeg::${_lowerComponent} PROPERTIES
INTERFACE_COMPILE_OPTIONS "${${_component}_DEFINITIONS}"
INTERFACE_INCLUDE_DIRECTORIES ${${_component}_INCLUDE_DIRS}
INTERFACE_LINK_LIBRARIES "${${_component}_LIBRARIES}"
INTERFACE_LINK_DIRECTORIES "${${_component}_LIBRARY_DIRS}"
)
__ffmpeg_internal_set_dependencies(${_lowerComponent})
target_link_libraries(FFmpeg::${_lowerComponent} INTERFACE "${${_component}_LIBRARY}")
if (UNIX AND NOT APPLE)
target_link_options(FFmpeg::${_lowerComponent} INTERFACE "-Wl,--exclude-libs=lib${_lowerComponent}")
endif ()
endif()
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)
set(FFMPEG_LIBRARY_DIRS ${FFMPEG_LIBRARY_DIRS} CACHE STRING "The FFmpeg library dirs." FORCE)
mark_as_advanced(FFMPEG_INCLUDE_DIRS
FFMPEG_LIBRARIES
FFMPEG_DEFINITIONS
FFMPEG_LIBRARY_DIRS)
#endif ()
if (NOT TARGET FFmpeg::FFmpeg)
add_library(FFmpeg INTERFACE)
set_target_properties(FFmpeg PROPERTIES
INTERFACE_COMPILE_OPTIONS "${FFMPEG_DEFINITIONS}"
INTERFACE_INCLUDE_DIRECTORIES "${FFMPEG_INCLUDE_DIRS}"
INTERFACE_LINK_LIBRARIES "${FFMPEG_LIBRARIES}"
INTERFACE_LINK_DIRECTORIES "${FFMPEG_LIBRARY_DIRS}")
add_library(FFmpeg::FFmpeg ALIAS FFmpeg)
endif()
# Now set the noncached _FOUND vars for the components.
foreach (_component AVCODEC AVDEVICE AVFORMAT AVUTIL POSTPROCESS SWSCALE)
set_component_found(${_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
REQUIRED_VARS ${_FFmpeg_REQUIRED_VARS}
HANDLE_COMPONENTS
)
|
