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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_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>
# <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
#
# 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>
# Copyright (c) 2019, Jan Holthuis, <holthuis.jan@googlemail.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: 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
find_package(PkgConfig QUIET)
if (PkgConfig_FOUND)
pkg_check_modules(PC_${_component} QUIET ${_pkgconfig})
endif ()
find_path(${_component}_INCLUDE_DIRS ${_header}
HINTS
${PC_${_component}_INCLUDEDIR}
${PC_${_component}_INCLUDE_DIRS}
${PC_FFMPEG_INCLUDE_DIRS}
PATH_SUFFIXES
ffmpeg
)
find_library(${_component}_LIBRARIES NAMES ${PC_${_component}_LIBRARIES} ${_library}
HINTS
${PC_${_component}_LIBDIR}
${PC_${_component}_LIBRARY_DIRS}
${PC_FFMPEG_LIBRARY_DIRS}
)
#message(STATUS ${${_component}_LIBRARIES})
#message(STATUS ${PC_${_component}_LIBRARIES})
set(${_component}_DEFINITIONS ${PC_${_component}_CFLAGS_OTHER} CACHE STRING "The ${_component} CFLAGS.")
set(${_component}_VERSION ${PC_${_component}_VERSION} CACHE STRING "The ${_component} version number.")
if (${_component}_LIBRARIES AND ${_component}_INCLUDE_DIRS)
# message(STATUS " - ${_component} found.")
set(${_component}_FOUND TRUE)
else ()
# message(STATUS " - ${_component} not found.")
endif ()
mark_as_advanced(
${_component}_INCLUDE_DIRS
${_component}_LIBRARIES
${_component}_DEFINITIONS
${_component}_VERSION)
endmacro()
# 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 "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})
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}")
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 ${FFMPEG_DEFINITIONS} CACHE STRING "The FFmpeg cflags." FORCE)
mark_as_advanced(FFMPEG_INCLUDE_DIRS
FFMPEG_LIBRARIES
FFMPEG_DEFINITIONS)
if (NOT TARGET FFmpeg::FFmpeg)
add_library(FFmpeg::FFmpeg INTERFACE IMPORTED)
set_target_properties(FFmpeg::FFmpeg PROPERTIES
INTERFACE_COMPILE_OPTIONS "${FFMPEG_DEFINITIONS}"
INTERFACE_INCLUDE_DIRECTORIES ${FFMPEG_INCLUDE_DIRS}
INTERFACE_LINK_LIBRARIES "${FFMPEG_LIBRARIES}")
endif()
# 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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