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Enhance FindFFmpeg.cmake

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- Add fallback component version parsing from the individual
  <includedir>/<libname>/version.h headers
- Switch to FFmpeg_<component>_<property> variable names, standard
  for CMake component variables
- No longer probe for non-requested components
- Use HANDLE_COMPONENT in find_package_handle_standard_args
- Parse, export overall FFmpeg_VERSION from libavutil/ffversion.h
This commit is contained in:
FeRD (Frank Dana)
2021-06-25 11:46:25 -04:00
parent 09eb807507
commit 93fb2eedf5
1 changed files with 151 additions and 70 deletions
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221
cmake/Modules/FindFFmpeg.cmake
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@@ -34,21 +34,23 @@ This module defines the following variables:
::
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.
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.
FFmpeg_VERSION - The FFmpeg package version found.
For each component, ``<component>_FOUND`` will be set if the component is available.
For each ``<component>_FOUND``, the following variables will be defined:
For each component, ``FFmpeg_<component>_FOUND`` will be set if the component is available.
For each ``FFmpeg_<component>_FOUND``, the following variables will be defined:
::
<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_<component>_INCLUDE_DIRS - Include directory necessary for using the
<component> headers
FFmpeg_<component>_LIBRARIES - Link these to use <component>
FFmpeg_<component>_DEFINITIONS - Compiler switches required for <component>
FFmpeg_<component>_VERSION - The components version
Backwards compatibility
^^^^^^^^^^^^^^^^^^^^^^^
@@ -57,10 +59,20 @@ For compatibility with previous versions of this module, uppercase names
for FFmpeg and for all components are also recognized, and all-uppercase
versions of the cache variables are also created.
Revision history
^^^^^^^^^^^^^^^^
ca. 2019 - Create CMake targets for discovered components
2019-06-25 - No longer probe for non-requested components
- Added fallback version.h parsing for components, when
pkgconfig is missing
- Added parsing of libavutil/ffversion.h for FFmpeg_VERSION
- Adopt standard FFmpeg_<component>_<property> variable names
- Switch to full signature for FPHSA, use HANDLE_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) 2019, FeRD (Frank Dana) <ferdnyc@gmail.com>
Copyright (c) 2019-2021, FeRD (Frank Dana) <ferdnyc@gmail.com>
Redistribution and use is allowed according to the terms of the BSD license.
For details see the accompanying COPYING-CMAKE-SCRIPTS file.
@@ -84,9 +96,9 @@ endif ()
# Marks the given component as found if both *_LIBRARIES AND *_INCLUDE_DIRS is present.
#
macro(set_component_found _component )
if (${_component}_LIBRARIES AND ${_component}_INCLUDE_DIRS)
if (FFmpeg_${_component}_LIBRARIES AND FFmpeg_${_component}_INCLUDE_DIRS)
# message(STATUS "FFmpeg - ${_component} found.")
set(${_component}_FOUND TRUE)
set(FFmpeg_${_component}_FOUND TRUE)
else ()
if (NOT FFmpeg_FIND_QUIETLY AND NOT FFMPEG_FIND_QUIETLY)
message(STATUS "FFmpeg - ${_component} not found.")
@@ -94,6 +106,34 @@ macro(set_component_found _component )
endif ()
endmacro()
#
### Macro: parse_lib_version
#
# Reads the file '${_pkgconfig}/version.h' in the component's _INCLUDE_DIR,
# and parses #define statements for COMPONENT_VERSION_(MAJOR|MINOR|PATCH)
# into a dotted string ${_component}_VERSION.
#
# Needed if the version is not supplied via pkgconfig's PC_${_component}_VERSION
macro(parse_lib_version _component _libname )
set(_version_h "${FFmpeg_${_component}_INCLUDE_DIRS}/${_libname}/version.h")
if(EXISTS "${_version_h}")
#message(STATUS "Parsing ${_component} version from ${_version_h}")
string(TOUPPER "${_libname}" _prefix)
set(_parts)
foreach(_lvl MAJOR MINOR MICRO)
file(STRINGS "${_version_h}" _lvl_version
REGEX "^[ \t]*#define[ \t]+${_prefix}_VERSION_${_lvl}[ \t]+[0-9]+[ \t]*$")
string(REGEX REPLACE
"^.*${_prefix}_VERSION_${_lvl}[ \t]+([0-9]+)[ \t]*$"
"\\1"
_lvl_match "${_lvl_version}")
list(APPEND _parts "${_lvl_match}")
endforeach()
list(JOIN _parts "." FFmpeg_${_component}_VERSION)
message(STATUS "Found ${_component} version: ${FFmpeg_${_component}_VERSION}")
endif()
endmacro()
#
### Macro: find_component
#
@@ -109,9 +149,9 @@ macro(find_component _component _pkgconfig _library _header)
if (PKG_CONFIG_FOUND)
pkg_check_modules(PC_${_component} ${_pkgconfig})
endif ()
endif (NOT WIN32)
endif()
find_path(${_component}_INCLUDE_DIRS ${_header}
find_path(FFmpeg_${_component}_INCLUDE_DIRS ${_header}
HINTS
/opt/
/opt/include/
@@ -123,7 +163,7 @@ macro(find_component _component _pkgconfig _library _header)
ffmpeg
)
find_library(${_component}_LIBRARIES NAMES ${_library}
find_library(FFmpeg_${_component}_LIBRARIES NAMES ${_library}
HINTS
${PC_${_component}_LIBDIR}
${PC_${_component}_LIBRARY_DIRS}
@@ -132,56 +172,86 @@ macro(find_component _component _pkgconfig _library _header)
$ENV{FFMPEGDIR}/bin/
)
set(${_component}_DEFINITIONS ${PC_${_component}_CFLAGS_OTHER} CACHE STRING "The ${_component} CFLAGS.")
set(${_component}_VERSION ${PC_${_component}_VERSION} CACHE STRING "The ${_component} version number.")
set(FFmpeg_${_component}_DEFINITIONS ${PC_${_component}_CFLAGS_OTHER} CACHE STRING "The ${_component} CFLAGS.")
# Take version from PkgConfig, or parse from its version.h header
if (PC_${_component}_VERSION)
set(FFmpeg_${_component}_VERSION ${PC_${_component}_VERSION})
else()
parse_lib_version(${_component} ${_pkgconfig})
endif()
set(FFmpeg_${_component}_VERSION ${FFmpeg_${_component}_VERSION} CACHE STRING "The ${_component} version number.")
set_component_found(${_component})
mark_as_advanced(
${_component}_INCLUDE_DIRS
${_component}_LIBRARIES
${_component}_DEFINITIONS
${_component}_VERSION
FFmpeg_${_component}_INCLUDE_DIRS
FFmpeg_${_component}_LIBRARIES
FFmpeg_${_component}_DEFINITIONS
FFmpeg_${_component}_VERSION
)
endmacro()
#
### Macro: parse_ff_version
#
# Read the libavutil/ffversion.h file and extract the definition
# for FFMPEG_VERSION, to use as our version string.
macro (parse_ff_version)
set(_header "${FFmpeg_avutil_INCLUDE_DIRS}/libavutil/ffversion.h")
if(EXISTS "${_header}")
#message(STATUS "Parsing ffmpeg version from ${_header}")
file(STRINGS "${_header}" _version_def
REGEX "^#define[ \t]+FFMPEG_VERSION[ \t]+\".*\"[ \t]*$")
string(REGEX REPLACE
"^.*FFMPEG_VERSION[ \t]+\"(.*)\".*$"
"\\1"
FFmpeg_VERSION "${_version_def}")
#message(STATUS "Found FFmpeg version: ${FFmpeg_VERSION}")
endif()
endmacro()
# Check for cached results. If there are skip the costly part.
if (NOT FFmpeg_LIBRARIES)
# Configs for all possible component.
set(avcodec_params libavcodec avcodec libavcodec/avcodec.h)
set(avdevice_params libavdevice avdevice libavdevice/avdevice.h)
set(avformat_params libavformat avformat libavformat/avformat.h)
set(avfilter_params libavfilter avfilter libavfilter/avfilter.h)
set(avutil_params libavutil avutil libavutil/avutil.h)
set(postproc_params libpostproc postproc libpostproc/postprocess.h)
set(swscale_params libswscale swscale libswscale/swscale.h)
set(swresample_params libswresample swresample libswresample/swresample.h)
set(avresample_params libavresample avresample libavresample/avresample.h)
# Check for all possible component.
find_component(avcodec libavcodec avcodec libavcodec/avcodec.h)
find_component(avdevice libavdevice avdevice libavdevice/avdevice.h)
find_component(avformat libavformat avformat libavformat/avformat.h)
find_component(avfilter libavfilter avfilter libavfilter/avfilter.h)
find_component(avutil libavutil avutil libavutil/avutil.h)
find_component(postproc libpostproc postproc libpostproc/postprocess.h)
find_component(swscale libswscale swscale libswscale/swscale.h)
find_component(swresample libswresample swresample libswresample/swresample.h)
find_component(avresample libavresample avresample libavresample/avresample.h)
else()
# Just set the noncached _FOUND vars for the components.
foreach(_component ${FFmpeg_ALL_COMPONENTS})
set_component_found(${_component})
endforeach ()
endif()
# Check if the requested components were found and add their stuff to the FFmpeg_* vars.
foreach (_component ${FFmpeg_FIND_COMPONENTS})
# Gather configs for each requested component
foreach(_component ${FFmpeg_FIND_COMPONENTS})
string(TOLOWER "${_component}" _component)
if (${_component}_FOUND)
# Only probe if not already _FOUND (expensive)
if (NOT FFmpeg_${_component}_FOUND)
find_component(${_component} ${${_component}_params})
endif()
# Add the component's configs to the FFmpeg_* variables
if (FFmpeg_${_component}_FOUND)
# message(STATUS "Requested 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})
set(FFmpeg_LIBRARIES ${FFmpeg_LIBRARIES} ${FFmpeg_${_component}_LIBRARIES})
set(FFmpeg_DEFINITIONS ${FFmpeg_DEFINITIONS} ${FFmpeg_${_component}_DEFINITIONS})
list(APPEND FFmpeg_INCLUDE_DIRS ${FFmpeg_${_component}_INCLUDE_DIRS})
else ()
# message(STATUS "Requested component ${_component} missing.")
endif ()
endforeach ()
endforeach()
# Make sure we've probed for avutil
if (NOT FFmpeg_avutil_FOUND)
find_component(avutil libavutil avutil libavutil/avutil.h)
endif()
# Get the overall FFmpeg version from libavutil/ffversion.h
parse_ff_version()
# Build the result lists with duplicates removed, in case of repeated
# invocations.
# invocations or component redundancy.
if (FFmpeg_INCLUDE_DIRS)
list(REMOVE_DUPLICATES FFmpeg_INCLUDE_DIRS)
endif()
@@ -196,57 +266,68 @@ endif ()
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_VERSION ${FFmpeg_VERSION} CACHE STRING "The overall FFmpeg version.")
mark_as_advanced(FFmpeg_INCLUDE_DIRS
mark_as_advanced(
FFmpeg_INCLUDE_DIRS
FFmpeg_LIBRARIES
FFmpeg_DEFINITIONS)
FFmpeg_DEFINITIONS
FFmpeg_VERSION
)
# Backwards compatibility
foreach(_suffix INCLUDE_DIRS LIBRARIES DEFINITIONS)
foreach(_suffix INCLUDE_DIRS LIBRARIES DEFINITIONS VERSION)
get_property(_help CACHE FFmpeg_${_suffix} PROPERTY HELPSTRING)
set(FFMPEG_${_suffix} ${FFmpeg_${_suffix}} CACHE STRING "${_help}" FORCE)
mark_as_advanced(FFMPEG_${_suffix})
endforeach()
foreach(_component ${FFmpeg_ALL_COMPONENTS})
if(${_component}_FOUND)
if(FFmpeg_${_component}_FOUND)
string(TOUPPER "${_component}" _uc_component)
set(${_uc_component}_FOUND TRUE)
set(FFMPEG_${_uc_component}_FOUND TRUE)
foreach(_suffix INCLUDE_DIRS LIBRARIES DEFINITIONS VERSION)
get_property(_help CACHE ${_component}_${_suffix} PROPERTY HELPSTRING)
set(${_uc_component}_${_suffix} ${${_component}_${_suffix}} CACHE STRING "${_help}" FORCE)
mark_as_advanced(${_uc_component}_${_suffix})
get_property(_help CACHE FFmpeg_${_component}_${_suffix} PROPERTY HELPSTRING)
set(FFMPEG_${_uc_component}_${_suffix} ${FFmpeg_${_component}_${_suffix}} CACHE STRING "${_help}" FORCE)
mark_as_advanced(FFMPEG_${_uc_component}_${_suffix})
endforeach()
endif()
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 ()
# XXX: HANDLE_COMPONENTS should take care of this, maybe? -FeRD
# foreach (_component ${FFmpeg_FIND_COMPONENTS})
# list(APPEND _FFmpeg_REQUIRED_VARS
# FFmpeg_${_component}_LIBRARIES
# FFmpeg_${_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})
find_package_handle_standard_args(FFmpeg
REQUIRED_VARS ${_FFmpeg_REQUIRED_VARS}
VERSION_VAR FFmpeg_VERSION
HANDLE_COMPONENTS
)
# Export targets for each found component
foreach (_component ${FFmpeg_ALL_COMPONENTS})
foreach (_component ${FFmpeg_FIND_COMPONENTS})
if(${_component}_FOUND)
# message(STATUS "Creating IMPORTED target FFmpeg::${_component}")
if(FFmpeg_${_component}_FOUND)
#message(STATUS "Creating IMPORTED target FFmpeg::${_component}")
if(NOT TARGET FFmpeg::${_component})
add_library(FFmpeg::${_component} UNKNOWN IMPORTED)
set_target_properties(FFmpeg::${_component} PROPERTIES
INTERFACE_INCLUDE_DIRECTORIES "${${_component}_INCLUDE_DIRS}")
INTERFACE_INCLUDE_DIRECTORIES
"${FFmpeg_${_component}_INCLUDE_DIRS}")
set_property(TARGET FFmpeg::${_component} APPEND PROPERTY
INTERFACE_COMPILE_DEFINITIONS "${${_component}_DEFINITIONS}")
INTERFACE_COMPILE_DEFINITIONS
"${FFmpeg_${_component}_DEFINITIONS}")
set_property(TARGET FFmpeg::${_component} APPEND PROPERTY
IMPORTED_LOCATION "${${_component}_LIBRARIES}")
IMPORTED_LOCATION "${FFmpeg_${_component}_LIBRARIES}")
endif()
endif()