configure

echo "LIBSUF=$LIBSUF" >> config.mak
echo "LIBNAME=$LIBNAME" >> config.mak
echo "SLIBPREF=$SLIBPREF" >> config.mak
echo "SLIBSUF=$SLIBSUF" >> config.mak
echo "EXESUF=$EXESUF" >> config.mak
echo "DEPEND_CMD=$DEPEND_CMD" >> config.mak
echo "VHOOK_DEPEND_CMD=$VHOOK_DEPEND_CMD" >> config.mak

if enabled bigendian; then
    echo "WORDS_BIGENDIAN=yes" >> config.mak
    echo "#define WORDS_BIGENDIAN 1" >> $TMPH
fi

if enabled sdl; then
    echo "SDL_LIBS=`"${SDL_CONFIG}" --libs`" >> config.mak
    echo "SDL_CFLAGS=`"${SDL_CONFIG}" --cflags`" >> config.mak
fi
if enabled texi2html; then
    echo "BUILD_DOC=yes" >> config.mak
fi

get_version(){
    name=$1
    file=$source_path/$2
    eval $(grep "#define ${name}_VERSION_M" "$file" | awk '{ print $2"="$3 }')
    eval ${name}_VERSION=\$${name}_VERSION_MAJOR.\$${name}_VERSION_MINOR.\$${name}_VERSION_MICRO
    lcname=$(tolower $name)
    eval echo "${lcname}_VERSION=\$${name}_VERSION" >> config.mak
    eval echo "${lcname}_VERSION_MAJOR=\$${name}_VERSION_MAJOR" >> config.mak
}

get_version LIBSWSCALE  libswscale/swscale.h
get_version LIBPOSTPROC libpostproc/postprocess.h
get_version LIBAVCODEC  libavcodec/avcodec.h
get_version LIBAVDEVICE libavdevice/avdevice.h
get_version LIBAVFORMAT libavformat/avformat.h
get_version LIBAVUTIL   libavutil/avutil.h
get_version LIBAVFILTER libavfilter/avfilter.h

if enabled shared; then
    echo "BUILD_SHARED=yes" >> config.mak
    echo "PIC=-fPIC -DPIC" >> config.mak
    echo "SLIBNAME=${SLIBNAME}" >> config.mak
    echo "SLIBNAME_WITH_VERSION=${SLIBNAME_WITH_VERSION}" >> config.mak
    echo "SLIBNAME_WITH_MAJOR=${SLIBNAME_WITH_MAJOR}" >> config.mak
    echo "SLIB_CREATE_DEF_CMD=${SLIB_CREATE_DEF_CMD}" >> config.mak
    echo "SLIB_EXTRA_CMD=${SLIB_EXTRA_CMD}" >> config.mak
    echo "SLIB_INSTALL_EXTRA_CMD=${SLIB_INSTALL_EXTRA_CMD}" >> config.mak
    echo "SLIB_UNINSTALL_EXTRA_CMD=${SLIB_UNINSTALL_EXTRA_CMD}" >> config.mak
fi
echo "LIB_INSTALL_EXTRA_CMD=${LIB_INSTALL_EXTRA_CMD}" >> config.mak
echo "EXTRALIBS=$extralibs" >> config.mak

print_config ARCH_   $TMPH config.mak $ARCH_LIST
print_config HAVE_   $TMPH config.mak $HAVE_LIST
print_config CONFIG_ $TMPH config.mak $CONFIG_LIST       \
                                      $DECODER_LIST      \
                                      $ENCODER_LIST      \
                                      $PARSER_LIST       \
                                      $BSF_LIST          \
                                      $DEMUXER_LIST      \
                                      $MUXER_LIST        \
                                      $FILTER_LIST       \
                                      $PROTOCOL_LIST     \
                                      $INDEV_LIST        \
                                      $OUTDEV_LIST       \

echo "#define restrict $_restrict" >> $TMPH

if enabled small; then
    echo "#define av_always_inline"  >> $TMPH
fi

echo "SRC_PATH=\"$source_path\"" >> config.mak
echo "SRC_PATH_BARE=$source_path" >> config.mak
echo "BUILD_ROOT=\"$PWD\"" >> config.mak

# Apparently it's not possible to portably echo a backslash.
enabled asmalign_pot &&
    printf '#define ASMALIGN(ZEROBITS) ".align " #ZEROBITS "\\n\\t"\n' >> $TMPH ||
    printf '#define ASMALIGN(ZEROBITS) ".align 1<<" #ZEROBITS "\\n\\t"\n' >> $TMPH

echo "#define EXTERN_PREFIX \"${extern_prefix}\"" >> $TMPH

echo "#endif /* FFMPEG_CONFIG_H */" >> $TMPH

# Do not overwrite an unchanged config.h to avoid superfluous rebuilds.
cmp -s $TMPH config.h &&
    echo "config.h is unchanged" ||
    mv -f $TMPH config.h

rm -f $TMPO $TMPC $TMPE $TMPS $TMPH

# build tree in object directory if source path is different from current one
if enabled source_path_used; then
    DIRS="\
        doc               \
        libavcodec        \
        libavcodec/alpha  \
        libavcodec/armv4l \
        libavcodec/bfin   \
        libavcodec/i386   \
        libavcodec/mlib   \
        libavcodec/ppc    \
        libavcodec/sh4    \
        libavcodec/sparc  \
        libavdevice       \
        libavfilter       \
        libavformat       \
        libavutil         \
        libpostproc       \
        libswscale        \
        tests             \
        tools             \
        vhook             \
        "
    FILES="\
        Makefile             \
        common.mak           \
        doc/texi2pod.pl      \
        libavcodec/Makefile  \
        libavdevice/Makefile \
        libavfilter/Makefile \
        libavformat/Makefile \
        libavutil/Makefile   \
        libpostproc/Makefile \
        libswscale/Makefile  \
        "
    for dir in $DIRS ; do
        mkdir -p $dir
    done
    for f in $FILES ; do
        $ln_s "$source_path/$f" $f
    done
fi


# build pkg-config files
# FIXME: libdir and includedir are hardcoded and may differ from the real path.

pkgconfig_generate(){
name=$1
comment=$2
version=$3
libs=$4
requires=$5
cat <<EOF >$name.pc
prefix=$PREFIX
exec_prefix=\${prefix}
libdir=\${exec_prefix}/lib
includedir=\${prefix}/include

Name: $name
Description: $comment
Version: $version
Requires: $requires
Conflicts:
Libs: -L\${libdir} $libs
Cflags: -I\${includedir}
EOF
}

pkgconfig_generate_uninstalled(){
name=$1
shortname=${name#lib}
comment=$2
version=$3
libs=$4
requires=$5
cat <<EOF >$name-uninstalled.pc
prefix=
exec_prefix=
libdir=\${pcfiledir}/$name
includedir=\${pcfiledir}

Name: $name
Description: $comment
Version: $version
Requires: $requires
Conflicts:
Libs: \${libdir}/${LIBPREF}${shortname}${LIBSUF} $libs
Cflags: -I\${includedir}
EOF
}

pkgconfig_generate libavutil "FFmpeg utility library" "$LIBAVUTIL_VERSION" -lavutil ""
pkgconfig_generate_uninstalled libavutil "FFmpeg utility library" "$LIBAVUTIL_VERSION"

pkgconfig_generate libavcodec "FFmpeg codec library" "$LIBAVCODEC_VERSION" "-lavcodec $extralibs" "$pkg_requires libavutil = $LIBAVUTIL_VERSION"
pkgconfig_generate_uninstalled libavcodec "FFmpeg codec library" "$LIBAVCODEC_VERSION" "$extralibs" "$pkg_requires libavutil = $LIBAVUTIL_VERSION"

pkgconfig_generate libavformat "FFmpeg container format library" "$LIBAVFORMAT_VERSION" "-lavformat $extralibs" "$pkg_requires libavcodec = $LIBAVCODEC_VERSION"
pkgconfig_generate_uninstalled libavformat "FFmpeg container format library" "$LIBAVFORMAT_VERSION" "$extralibs" "$pkg_requires libavcodec = $LIBAVCODEC_VERSION"

pkgconfig_generate libavdevice "FFmpeg device handling library" "$LIBAVDEVICE_VERSION" "-lavdevice $extralibs" "$pkg_requires libavformat = $LIBAVFORMAT_VERSION"
pkgconfig_generate_uninstalled libavdevice "FFmpeg device handling library" "$LIBAVDEVICE_VERSION" "$extralibs" "$pkg_requires libavformat = $LIBAVFORMAT_VERSION"
if enabled postproc; then
    pkgconfig_generate libpostproc "FFmpeg post processing library" "$LIBPOSTPROC_VERSION" -lpostproc ""
    pkgconfig_generate_uninstalled libpostproc "FFmpeg post processing library" "$LIBPOSTPROC_VERSION"
fi

if enabled swscale; then
    pkgconfig_generate libswscale "FFmpeg image rescaling library" "$LIBSWSCALE_VERSION" -lswscale "libavutil = $LIBAVUTIL_VERSION"
    pkgconfig_generate_uninstalled libswscale "FFmpeg image rescaling library" "$LIBSWSCALE_VERSION" "" "libavutil = $LIBAVUTIL_VERSION"
else
    pkgconfig_generate libswscale "FFmpeg image rescaling library" "$LIBSWSCALE_VERSION" "" "$pkg_requires libavcodec = $LIBAVCODEC_VERSION"
    pkgconfig_generate_uninstalled libswscale "FFmpeg image rescaling library" "$LIBSWSCALE_VERSION" "" "$pkg_requires libavcodec = $LIBAVCODEC_VERSION"
    apply libswscale.pc sed s/^Libs:.*$/Libs:/
    apply libswscale-uninstalled.pc sed s/^Libs:.*$/Libs:/
fi

if enabled avfilter; then
  pkgconfig_generate libavfilter "FFmpeg video filtering library" "$LIBAVFILTER_VERSION" "-lavfilter $extralibs" "$pkg_requires libavutil = $LIBAVUTIL_VERSION" ffmpeg
  pkgconfig_generate_uninstalled libavfilter "FFmpeg video filtering library" "$LIBAVFILTER_VERSION" "$extralibs" "$pkg_requires libavutil = $LIBAVUTIL_VERSION"
fi