cmake_modules/FindFFMPEG.cmake
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# Find ffmpeg/libav libraries (libavcodec, libavformat and libavutil)
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# Once done this will define
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#
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#  FFMPEG_FOUND             - system has libavcodec, libavformat, libavutil
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#  FFMPEG_INCLUDE_DIR       - the libav include directories
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#  FFMPEG_LIBRARIES         - the libav libraries
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#
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#  LIBAVCODEC_LIBRARY      - the libavcodec library
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#  LIBAVCODEC_INCLUDE_DIR  - the libavcodec include directory
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#  LIBAVFORMAT_LIBRARY     - the libavformat library
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#  LIBAVUTIL_LIBRARY       - the libavutil library
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#
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#  Copyright (c) 2008 Andreas Schneider <mail@cynapses.org>
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#  Modified for other libraries by Lasse Kärkkäinen <tronic>
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#  Modified for Hedgewars by Stepik777
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#  Copyright (c) 2013 Vittorio Giovara <vittorio.giovara@gmail.com>
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#
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#  Redistribution and use is allowed according to the terms of the New
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#  BSD license.
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#
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include(FindPackageHandleStandardArgs)
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# use pkg-config to get the directories and then use these values
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# in the FIND_PATH() and FIND_LIBRARY() calls
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find_package(PkgConfig)
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if(PKG_CONFIG_FOUND)
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    if(NOT LIBAVCODEC_INCLUDE_DIR OR NOT LIBAVCODEC_LIBRARY)
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        pkg_check_modules(_FFMPEG_AVCODEC libavcodec)
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    endif()
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    if(NOT LIBAVFORMAT_LIBRARY)
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        pkg_check_modules(_FFMPEG_AVFORMAT libavformat)
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    endif()
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    if(NOT LIBAVUTIL_LIBRARY)
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        pkg_check_modules(_FFMPEG_AVUTIL libavutil)
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    endif()
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endif(PKG_CONFIG_FOUND)
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find_path(LIBAVCODEC_INCLUDE_DIR
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    NAMES libavcodec/avcodec.h
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    PATHS ${_FFMPEG_AVCODEC_INCLUDE_DIRS}    #pkg-config
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          /usr/include /usr/local/include    #system level
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          /opt/local/include /sw/include     #macports & fink
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    PATH_SUFFIXES libav ffmpeg
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)
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#TODO: add other include paths
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find_library(LIBAVCODEC_LIBRARY
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    NAMES avcodec
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    PATHS ${_FFMPEG_AVCODEC_LIBRARY_DIRS}   #pkg-config
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          /usr/lib /usr/local/lib           #system level
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          /opt/local/lib /sw/lib            #macports & fink
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)
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find_library(LIBAVFORMAT_LIBRARY
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    NAMES avformat
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    PATHS ${_FFMPEG_AVFORMAT_LIBRARY_DIRS}  #pkg-config
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          /usr/lib /usr/local/lib           #system level
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          /opt/local/lib /sw/lib            #macports & fink
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)
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find_library(LIBAVUTIL_LIBRARY
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    NAMES avutil
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    PATHS ${_FFMPEG_AVUTIL_LIBRARY_DIRS}    #pkg-config
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          /usr/lib /usr/local/lib           #system level
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          /opt/local/lib /sw/lib            #macports & fink
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)
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find_package_handle_standard_args(FFMPEG DEFAULT_MSG LIBAVCODEC_LIBRARY LIBAVCODEC_INCLUDE_DIR
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                                                     LIBAVFORMAT_LIBRARY
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                                                     LIBAVUTIL_LIBRARY
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                                                     )
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set(FFMPEG_INCLUDE_DIR ${LIBAVCODEC_INCLUDE_DIR}
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                       #TODO: add other include paths
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                       )
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set(FFMPEG_LIBRARIES ${LIBAVCODEC_LIBRARY}
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                     ${LIBAVFORMAT_LIBRARY}
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                     ${LIBAVUTIL_LIBRARY}
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                     )
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mark_as_advanced(FFMPEG_INCLUDE_DIR FFMPEG_LIBRARIES LIBAVCODEC_LIBRARY LIBAVCODEC_INCLUDE_DIR LIBAVFORMAT_LIBRARY LIBAVUTIL_LIBRARY)
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