configure

ffmpeg源码分析

#!/bin/sh
#
# ffmpeg configure script (c) 2000, 2001, 2002 Fabrice Bellard
#

if test x"$1" = x"-h" -o x"$1" = x"--help" ; then
cat << EOF

Usage: configure [options]
Options: [defaults in brackets after descriptions]

EOF
echo "Standard options:"
echo "  --help                   print this message"
echo "  --prefix=PREFIX          install in PREFIX [$prefix]"
echo "  --libdir=DIR             install libs in DIR [PREFIX/lib]"
echo "  --incdir=DIR             install includes in DIR [PREFIX/include/ffmpeg]"
echo "  --mandir=DIR             install man page in DIR [PREFIX/man]"
echo "  --enable-mp3lame         enable MP3 encoding via libmp3lame [default=no]"
echo "  --enable-libogg          enable Ogg support via libogg [default=no]"
echo "  --enable-vorbis          enable Vorbis support via libvorbis [default=no]"
echo "  --enable-theora          enable Theora support via libtheora [default=no]"
echo "  --enable-faad            enable FAAD support via libfaad [default=no]"
echo "  --enable-faadbin         build FAAD support with runtime linking [default=no]"
echo "  --enable-faac            enable FAAC support via libfaac [default=no]"
echo "  --enable-libgsm          enable GSM support via libgsm [default=no]"
echo "  --enable-xvid            enable XviD support via xvidcore [default=no]"
echo "  --enable-x264            enable H.264 encoding via x264 [default=no]"
echo "  --enable-mingw32         enable MinGW native/cross Windows compile"
echo "  --enable-mingwce         enable MinGW native/cross WinCE compile"
echo "  --enable-a52             enable GPLed A52 support [default=no]"
echo "  --enable-a52bin          open liba52.so.0 at runtime [default=no]"
echo "  --enable-dts             enable GPLed DTS support [default=no]"
echo "  --enable-pp              enable GPLed postprocessing support [default=no]"
echo "  --enable-static          build static libraries [default=yes]"
echo "  --disable-static         do not build static libraries [default=no]"
echo "  --enable-shared          build shared libraries [default=no]"
echo "  --disable-shared         do not build shared libraries [default=yes]"
echo "  --enable-amr_nb          enable amr_nb float audio codec"
echo "  --enable-amr_nb-fixed    use fixed point for amr-nb codec"
echo "  --enable-amr_wb          enable amr_wb float audio codec"
echo "  --enable-amr_if2         enable amr_wb IF2 audio codec"
echo "  --enable-sunmlib         use Sun medialib [default=no]"
echo "  --enable-pthreads        use pthreads [default=no]"
echo "  --enable-dc1394          enable IIDC-1394 grabbing using libdc1394"
echo "                           and libraw1394 [default=no]"
echo "  --enable-gpl             allow use of GPL code, the resulting libav*"
echo "                           and ffmpeg will be under GPL [default=no]"
echo ""
echo "Advanced options (experts only):"
echo "  --source-path=PATH       path to source code [$source_path]"
echo "  --cross-prefix=PREFIX    use PREFIX for compilation tools [$cross_prefix]"
echo "  --cc=CC                  use C compiler CC [$cc]"
echo "  --make=MAKE              use specified make [$make]"
echo "  --extra-cflags=ECFLAGS   add ECFLAGS to CFLAGS [$CFLAGS]"
echo "  --extra-ldflags=ELDFLAGS add ELDFLAGS to LDFLAGS [$LDFLAGS]"
echo "  --extra-libs=ELIBS       add ELIBS [$ELIBS]"
echo "  --build-suffix=SUFFIX    suffix for application specific build []"
echo "  --cpu=CPU                force cpu to CPU  [$cpu]"
echo "  --tune=CPU               tune code for a particular CPU"
echo "                           (may fail or perform badly on other CPUs)"
echo "  --powerpc-perf-enable    enable performance report on PPC"
echo "                           (requires enabling PMC)"
echo "  --disable-mmx            disable MMX usage"
echo "  --disable-iwmmxt         disable iwmmxt usage"
echo "  --disable-altivec        disable AltiVec usage"
echo "  --disable-audio-oss      disable OSS audio support [default=no]"
echo "  --disable-audio-beos     disable BeOS audio support [default=no]"
echo "  --disable-v4l            disable video4linux grabbing [default=no]"
echo "  --disable-v4l2           disable video4linux2 grabbing [default=no]"
echo "  --disable-bktr           disable bktr video grabbing [default=no]"
echo "  --disable-dv1394         disable DV1394 grabbing [default=no]"
echo "  --disable-network        disable network support [default=no]"
echo "  --disable-zlib           disable zlib [default=no]"
echo "  --disable-lzo            disable lzo [default=no]"
echo "  --disable-simple_idct    disable simple IDCT routines [default=no]"
echo "  --disable-vhook          disable video hooking support"
echo "  --enable-gprof           enable profiling with gprof [$gprof]"
echo "  --disable-debug          disable debugging symbols"
echo "  --disable-opts           disable compiler optimizations"
echo "  --disable-mpegaudio-hp   faster (but less accurate)"
echo "                           MPEG audio decoding [default=no]"
echo "  --disable-protocols      disable I/O protocols support [default=no]"
echo "  --disable-ffserver       disable ffserver build"
echo "  --disable-ffplay         disable ffplay build"
echo "  --enable-small           optimize for size instead of speed"
echo "  --enable-memalign-hack   emulate memalign, interferes with memory debuggers"
echo "  --disable-strip          disable stripping of executables and shared libraries"
echo "  --disable-encoder=NAME   disables encoder NAME"
echo "  --enable-encoder=NAME    enables encoder NAME"
echo "  --disable-decoder=NAME   disables decoder NAME"
echo "  --enable-decoder=NAME    enables decoder NAME"
echo "  --disable-encoders       disables all encoders"
echo "  --disable-decoders       disables all decoders"
echo "  --disable-muxers         disables all muxers"
echo "  --disable-demuxers       disables all demuxers"
echo ""
echo "NOTE: Object files are built at the place where configure is launched."
exit 1
fi

# set temporary file name
if test ! -z "$TMPDIR" ; then
    TMPDIR1="${TMPDIR}"
elif test ! -z "$TEMPDIR" ; then
    TMPDIR1="${TEMPDIR}"
else
    TMPDIR1="/tmp"
fi

TMPC="${TMPDIR1}/ffmpeg-conf-${RANDOM}-$$-${RANDOM}.c"
TMPO="${TMPDIR1}/ffmpeg-conf-${RANDOM}-$$-${RANDOM}.o"
TMPE="${TMPDIR1}/ffmpeg-conf-${RANDOM}-$$-${RANDOM}"
TMPS="${TMPDIR1}/ffmpeg-conf-${RANDOM}-$$-${RANDOM}.S"
TMPH="${TMPDIR1}/ffmpeg-conf-${RANDOM}-$$-${RANDOM}.h"

# default parameters
prefix="/usr/local"
libdir=""
incdir=""
mandir=""
bindir=""
cross_prefix=""
cc="gcc"
ar="ar"
ranlib="ranlib"
make="make"
strip="strip"
cpu=`uname -m`
tune="generic"
powerpc_perf="no"
mmx="default"
iwmmxt="default"
altivec="default"
mmi="default"
case "$cpu" in
  i386|i486|i586|i686|i86pc|BePC)
    cpu="x86"
  ;;
  x86_64|amd64)
    cpu="x86"
    canon_arch="`cc -dumpmachine | sed -e 's,\([^-]*\)-.*,\1,'`"
    if [ x"$canon_arch" = x"x86_64" -o x"$canon_arch" = x"amd64" ]; then
      if [ -z "`echo $CFLAGS | grep -- -m32`"  ]; then
        cpu="x86_64"
      fi
    fi
  ;;
  # armv4l is a subset of armv5tel
  armv4l|armv5tel)
    cpu="armv4l"
  ;;
  alpha)
    cpu="alpha"
  ;;
  "Power Macintosh"|ppc|powerpc)
    cpu="powerpc"
  ;;
  mips|mipsel)
    cpu="mips"
  ;;
  sun4u|sparc64)
    cpu="sparc64"
  ;;
  sparc)
    cpu="sparc"
  ;;
  sh4)
    cpu="sh4"
  ;;
  parisc|parisc64)
    cpu="parisc"
  ;;
  s390|s390x)
    cpu="s390"
  ;;
  m68k)
    cpu="m68k"
  ;;
  ia64)
    cpu="ia64"
  ;;
  *)
    cpu="unknown"
  ;;
esac
gprof="no"
v4l="yes"
v4l2="yes"
bktr="no"
audio_oss="yes"
audio_beos="no"
dv1394="yes"
dc1394="no"
network="yes"
zlib="yes"
lzo="yes"
libgsm="no"
mp3lame="no"
libogg="no"
vorbis="no"
theora="no"
faad="no"
faadbin="no"
faac="no"
xvid="no"
x264="no"
a52="no"
a52bin="no"
dts="no"
pp="no"
mingw32="no"
mingwce="no"
cygwin="no"
os2="no"
lstatic="yes"
lshared="no"
optimize="yes"
debug="yes"
dostrip="yes"
installstrip="-s"
extralibs="-lm"
simpleidct="yes"
bigendian="no"
inttypes="yes"
emu_fast_int="no"
vhook="default"
dlfcn="no"
dlopen="no"
mpegaudio_hp="yes"
SHFLAGS='-shared -Wl,-soname,$@.$(LIBMAJOR)'
netserver="no"
need_inet_aton="no"
protocols="yes"
ffserver="yes"
ffplay="yes"
LIBOBJFLAGS=""
LDFLAGS=-Wl,--warn-common
FFSLDFLAGS=-Wl,-E
LDCONFIG="ldconfig"
LIBPREF="lib"
LIBSUF=".a"
LIB='$(LIBPREF)$(NAME)$(LIBSUF)'
SLIBPREF="lib"
SLIBSUF=".so"
SLIBNAME='$(SLIBPREF)$(NAME)$(SLIBSUF)'
SLIBNAME_WITH_VERSION='$(SLIBPREF)$(NAME)$(SLIBSUF).$(LIBVERSION)'
SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(NAME)$(SLIBSUF).$(LIBMAJOR)'
EXESUF=""
BUILDSUF=""
amr_nb="no"
amr_wb="no"
amr_nb_fixed="no"
amr_if2="no"
sunmlib="no"
pthreads="no"
gpl="no"
memalignhack="no"
muxers="yes"
demuxers="yes"

# OS specific
targetos=`uname -s`
case $targetos in
BeOS)
prefix="/boot/home/config"
# helps building libavcodec
CFLAGS="-DPIC -fomit-frame-pointer"
# 3 gcc releases known for BeOS, each with ugly bugs
gcc_version="`$cc -v 2>&1 | grep version | cut -d ' ' -f3-`"
case "$gcc_version" in
2.9-beos-991026*|2.9-beos-000224*) echo "R5/GG gcc"
mmx="no"
;;
*20010315*) echo "BeBits gcc"
CFLAGS="$CFLAGS -fno-expensive-optimizations"
;;
esac
SHFLAGS=-nostart
# disable Linux things
audio_oss="no"
v4l="no"
v4l2="no"
dv1394="no"
# enable BeOS things
audio_beos="yes"
# no need for libm, but the inet stuff
# Check for BONE
if (echo $BEINCLUDES|grep 'headers/be/bone' >/dev/null); then
extralibs="-lbind -lsocket"
else
netserver="yes"
need_inet_aton="yes"
extralibs="-lnet"
fi ;;
SunOS)
v4l="no"
v4l2="no"
audio_oss="no"
dv1394="no"
make="gmake"
LDFLAGS=""
FFSLDFLAGS=""
need_inet_aton="yes"
extralibs="$extralibs -lsocket -lnsl"
;;
NetBSD)
v4l="no"
v4l2="no"
bktr="yes"
audio_oss="yes"
dv1394="no"
make="gmake"
LDFLAGS="$LDFLAGS -export-dynamic"
case `uname -r` in
2.*) extralibs="$extralibs -lossaudio"
;;
esac
;;
OpenBSD)
v4l="no"
v4l2="no"
bktr="yes"
audio_oss="yes"
dv1394="no"
make="gmake"
LIBOBJFLAGS="\$(PIC)"
LDFLAGS="$LDFLAGS -export-dynamic -pthread"
LDCONFIG="ldconfig -m \$(libdir)"
extralibs="$extralibs -lossaudio"
;;
FreeBSD)
v4l="no"
v4l2="no"
bktr="yes"
audio_oss="yes"
dv1394="no"
make="gmake"
CFLAGS="-pthread"
LDFLAGS="$LDFLAGS -export-dynamic -pthread"
;;
BSD/OS)
v4l="no"
v4l2="no"
bktr="yes"
audio_oss="yes"
dv1394="no"
extralibs="-lpoll -lgnugetopt -lm"
make="gmake"
strip="strip -d"
installstrip=""
;;
Darwin)
cc="cc"
v4l="no"
v4l2="no"
audio_oss="no"
dv1394="no"
SHFLAGS="-dynamiclib -Wl,-single_module -Wl,-install_name,\$(libdir)/\$(SLIBNAME),-current_version,\$(SPPVERSION),-compatibility_version,\$(SPPVERSION)"
extralibs=""
darwin="yes"
strip="strip -x"
installstrip=""
LDFLAGS="-Wl,-dynamic,-search_paths_first"
SLIBSUF=".dylib"
SLIBNAME_WITH_FULLVERSION='$(SLIBPREF)$(NAME).$(LIBVERSION)$(SLIBSUF)'
SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(NAME).$(LIBMAJOR)$(SLIBSUF)'
FFSLDFLAGS=-Wl,-bind_at_load
;;
MINGW32*)
# Note: the rest of the mingw32 config is done afterwards as mingw32
# can be forced on the command line for Linux cross compilation.
mingw32="yes"
;;
CYGWIN*)
v4l="no"
v4l2="no"
audio_oss="yes"
dv1394="no"
vhook="no"
extralibs=""
cygwin="yes"
EXESUF=".exe"
;;
Linux)
LDFLAGS="$LDFLAGS -rdynamic"
;;
IRIX*)
ranlib="echo ignoring ranlib"
v4l="no"
v4l2="no"
audio_oss="no"
make="gmake"
;;
OS/2)
TMPE=$TMPE".exe"
ar="emxomfar -p128"
ranlib="echo ignoring ranlib"
strip="echo ignoring strip"
CFLAGS="-Zomf"
LDFLAGS="-Zomf -Zstack 16384 -s"
SHFLAGS="-Zdll -Zomf"
FFSLDFLAGS=""
LIBPREF=""
LIBSUF=".lib"
SLIBPREF=""
SLIBSUF=".dll"
EXESUF=".exe"
extralibs=""
pkg_requires=""
v4l="no"
v4l2="no"
audio_oss="no"
dv1394="no"
ffserver="no"
vhook="no"
os2="yes"

;;
*) ;;
esac

# From MPlayer configure. We need TARGET_OS available
# to the Makefile, so it can distinguish between flavors
# of AltiVec on PowerPC.
TARGET_OS=`( uname -s ) 2>&1`
  case "$TARGET_OS" in
  Linux|FreeBSD|NetBSD|BSD/OS|OpenBSD|SunOS|QNX|Darwin|GNU|BeOS|MorphOS)
    ;;
  IRIX*)
    TARGET_OS=IRIX
    ;;
  HP-UX*)
    TARGET_OS=HP-UX
    ;;
  [cC][yY][gG][wW][iI][nN]*)
    TARGET_OS=CYGWIN
    ;;
  *)
    TARGET_OS="$TARGET_OS-UNKNOWN"
    ;;
  esac

# find source path
source_path="`dirname $0`"
source_path_used="yes"
if test -z "$source_path" -o "$source_path" = "." ; then
    source_path=`pwd`
    source_path_used="no"
else
    source_path="`cd \"$source_path\"; pwd`"
fi

FFMPEG_CONFIGURATION=" "
for opt do
  FFMPEG_CONFIGURATION="$FFMPEG_CONFIGURATION""$opt "
done

CODEC_LIST=`grep 'register_avcodec(&[a-z]' $source_path/libavcodec/allcodecs.c  | sed 's/.*&\(.*\)).*/\1/'`

for opt do
  case "$opt" in
  --prefix=*) prefix=`echo $opt | cut -d '=' -f 2`; force_prefix=yes
  ;;
  --libdir=*) libdir=`echo $opt | cut -d '=' -f 2`; force_libdir=yes
  ;;
  --incdir=*) incdir=`echo $opt | cut -d '=' -f 2`;
  ;;
  --mandir=*) mandir=`echo $opt | cut -d '=' -f 2`
  ;;
  --source-path=*) source_path=`echo $opt | cut -d '=' -f 2`
  ;;
  --cross-prefix=*) cross_prefix=`echo $opt | cut -d '=' -f 2`
  ;;
  --cc=*) cc=`echo $opt | cut -d '=' -f 2-`
  ;;
  --make=*) make=`echo $opt | cut -d '=' -f 2`
  ;;
  --extra-cflags=*) CFLAGS="$CFLAGS ${opt#--extra-cflags=}"
  ;;
  --extra-ldflags=*) LDFLAGS="$LDFLAGS ${opt#--extra-ldflags=}"
  ;;
  --extra-libs=*) extralibs=${opt#--extra-libs=}
  ;;
  --build-suffix=*) BUILDSUF=${opt#--build-suffix=}
  ;;
  --cpu=*) cpu=`echo $opt | cut -d '=' -f 2`
  ;;
  --tune=*) tune=`echo $opt | cut -d '=' -f 2`
  ;;
  --powerpc-perf-enable) powerpc_perf="yes"
  ;;
  --disable-mmx) mmx="no"
  ;;
  --disable-iwmmxt) iwmmxt="no"
  ;;
  --disable-altivec) altivec="no"
  ;;
  --enable-gprof) gprof="yes"
  ;;
  --disable-v4l) v4l="no"
  ;;
  --disable-v4l2) v4l2="no"
  ;;
  --disable-bktr) bktr="no"
  ;;
  --disable-audio-oss) audio_oss="no"
  ;;
  --disable-audio-beos) audio_beos="no"
  ;;
  --disable-dv1394) dv1394="no"
  ;;
  --disable-network) network="no"; ffserver="no"
  ;;
  --disable-zlib) zlib="no"
  ;;
  --disable-lzo) lzo="no"
  ;;
  --enable-a52) a52="yes"
  ;;
  --enable-a52bin) a52bin="yes"
  ;;
  --enable-dts) dts="yes"
    extralibs="$extralibs -ldts"