From e0761bf3b9e2ccad6884a8577751262d2923cd2b Mon Sep 17 00:00:00 2001 From: Sandu Liviu Catalin Date: Thu, 23 Mar 2023 20:24:02 +0200 Subject: [PATCH] Create FindFFmpeg.cmake --- cmake/FindFFmpeg.cmake | 152 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 152 insertions(+) create mode 100644 cmake/FindFFmpeg.cmake diff --git a/cmake/FindFFmpeg.cmake b/cmake/FindFFmpeg.cmake new file mode 100644 index 00000000..d57530f4 --- /dev/null +++ b/cmake/FindFFmpeg.cmake @@ -0,0 +1,152 @@ +# 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 additionally set. +# - AVCODEC +# - AVDEVICE +# - AVFORMAT +# - AVFILTER +# - AVUTIL +# - POSTPROC +# - SWSCALE +# - SWRESAMPLE +# the following variables will be defined +# _FOUND - System has +# _INCLUDE_DIRS - Include directory necessary for using the headers +# _LIBRARIES - Link these to use +# _DEFINITIONS - Compiler switches required for using +# _VERSION - The components version +# +# Copyright (c) 2006, Matthias Kretz, +# Copyright (c) 2008, Alexander Neundorf, +# Copyright (c) 2011, Michael Jansen, +# +# 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) + else () + # message(STATUS " - ${_component} not found.") + endif () +endmacro() + +# +### Macro: find_component +# +# Checks for the given component by invoking pkgconfig and then looking up the libraries and +# include directories. +# +macro(find_component _component _pkgconfig _library _header) + + if (NOT WIN32) + # use pkg-config to get the directories and then use these values + # in the FIND_PATH() and FIND_LIBRARY() calls + find_package(PkgConfig) + if (PKG_CONFIG_FOUND) + pkg_check_modules(PC_${_component} ${_pkgconfig}) + endif () + endif (NOT WIN32) + + find_path(${_component}_INCLUDE_DIRS ${_header} + HINTS + ${PC_${_component}_INCLUDEDIR} + ${PC_${_component}_INCLUDE_DIRS} + PATH_SUFFIXES + ffmpeg + ) + + find_library(${_component}_LIBRARIES NAMES ${_library} + HINTS + ${PC_${_component}_LIBDIR} + ${PC_${_component}_LIBRARY_DIRS} + ) + + 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(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}) + 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})