#!/bin/sh

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

if test ! -z "$TMPDIR" ; then
	TMPC="${TMPDIR}/${TMPC}"
	TMPCPP="${TMPDIR}/${TMPCPP}"
	TMPO="${TMPDIR}/${TMPO}"
	TMPS="${TMPDIR}/${TMPS}"
	TMPH="${TMPDIR}/${TMPH}"
elif test ! -z "$TEMPDIR" ; then
	TMPC="${TEMPDIR}/${TMPC}"
	TMPCPP="${TEMPDIR}/${TMPCPP}"
	TMPO="${TEMPDIR}/${TMPO}"
	TMPS="${TEMPDIR}/${TMPS}"
	TMPH="${TEMPDIR}/${TMPH}"
else
	TMPC="/tmp/${TMPC}"
	TMPCPP="/tmp/${TMPCPP}"
	TMPO="/tmp/${TMPO}"
	TMPS="/tmp/${TMPS}"
	TMPH="/tmp/${TMPH}"
fi

# default parameters
prefix="/usr/local"
cc="gcc"
ar="ar"
cpu=`uname -m`
case "$cpu" in
  i386|i486|i586|i686|i86pc|BePC)
    cpu="x86"
    mmx="yes"
  ;;
  armv4l)
    cpu="armv4l"
    mmx="no"
  ;;
  alpha)
    cpu="alpha"
    mmx="no"
  ;;
  *)
    mmx="no"
  ;;
esac
gprof="no"
grab="yes"
mp3lame="no"
a52bin="no"
win32="no"
lshared="no"
extralibs="-lm"
simpleidct="yes"

# OS specific
targetos=`uname -s`
case $targetos in
BeOS)
prefix="/boot/home/config"
# helps building libavcodec
grab="no"
CFLAGS="-O2 -DPIC"
# 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
echo "Not sure building for net_server will succeed... good luck."
extralibs="-lsocket"
fi ;;
*) ;;
esac

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

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

  --help                  print this message
EOF
echo "  --prefix=PREFIX         install in PREFIX [$prefix]"
echo "  --cc=CC                 use C compiler CC [$cc]"
echo "  --cpu=CPU               force cpu to CPU  [$cpu]"
echo "  --disable-mmx           disable mmx usage"
echo "  --enable-gprof          enable profiling with gprof [$gprof]"
echo "  --disable-grab          disable audio/video grabbing code"
echo "  --disable-simple_idct   disable simple IDCT routines [default=no]"
echo "  --enable-mp3lame        enable mp3 encoding via libmp3lame [default=no]"
echo "  --enable-win32          enable win32 cross compile"
echo "  --enable-a52bin         open liba52.so.0 at runtime [default=no]"
echo "  --enable-shared         build shared libraries [default=no]"
exit 1
fi

for opt do
  case "$opt" in
  --prefix=*) prefix=`echo $opt | cut -d '=' -f 2`
  ;;
  --cc=*) cc=`echo $opt | cut -d '=' -f 2`
  ;;
  --cpu=*) cpu=`echo $opt | cut -d '=' -f 2`
  ;;
  --disable-mmx) mmx="no"
  ;;
  --enable-gprof) gprof="yes"
  ;;
  --disable-grab) grab="no"
  ;;
  --enable-a52bin) a52bin="yes" ; extralibs="-ldl $extralibs"
  ;;
  --enable-mp3lame) mp3lame="yes"
  ;;
  --disable-simple_idct) simpleidct="no"
  ;;
  --enable-win32) win32="yes"
  ;;
  --enable-shared) lshared="yes"
  ;;
  esac
done

# Checking for CFLAGS
if test -z "$CFLAGS"; then
    CFLAGS="-O2"
fi

if test "$win32" = "yes" ; then
    cross_prefix="i386-mingw32msvc-"
    cc="${cross_prefix}gcc"
    ar="${cross_prefix}ar"
    grab="no"
fi

# ---
# check availability of some header files

cat > $TMPC << EOF
#include <malloc.h>
int main( void ) { return 0; }
EOF

_memalign=no
_malloc_h=no
if $cc -o $TMPO $TMPC 2> /dev/null ; then
_malloc_h=yes
_memalign=yes
# check for memalign - atmos
cat > $TMPC << EOF
#include <malloc.h>
int main ( void ) {
char *string = NULL;
string = memalign(64, sizeof(char));
return 0;
}
EOF
$cc -o $TMPO $TMPC 2> /dev/null || _memalign=no
fi

echo "Install prefix   $prefix"
echo "C compiler       $cc"
echo "CPU              $cpu"
echo "MMX enabled      $mmx"
echo "gprof enabled    $gprof"
echo "grab enabled     $grab"
echo "mp3lame enabled  $mp3lame"
echo "a52 dlopened     $a52bin"

echo "Creating config.mak and config.h"

echo "# Automatically generated by configure - do not modify" > config.mak
echo "/* Automatically generated by configure - do not modify */" > $TMPH

echo "prefix=$prefix" >> config.mak
echo "MAKE=make" >> config.mak
echo "CC=$cc" >> config.mak
echo "AR=$ar" >> config.mak
echo "OPTFLAGS=$CFLAGS" >> config.mak
if test "$cpu" = "x86" ; then
  echo "TARGET_ARCH_X86=yes" >> config.mak
  echo "#define ARCH_X86 1" >> $TMPH
fi
if test "$cpu" = "armv4l" ; then
  echo "TARGET_ARCH_ARMV4L=yes" >> config.mak
  echo "#define ARCH_ARMV4L 1" >> $TMPH
fi
if test "$cpu" = "alpha" ; then
  echo "TARGET_ARCH_ALPHA=yes" >> config.mak
  echo "#define ARCH_ALPHA 1" >> $TMPH
fi
if test "$mmx" = "yes" ; then
  echo "TARGET_MMX=yes" >> config.mak
  echo "#define HAVE_MMX 1" >> $TMPH
fi
if test "$gprof" = "yes" ; then
  echo "TARGET_GPROF=yes" >> config.mak
  echo "#define HAVE_GPROF 1" >> $TMPH
fi
if test "$lshared" = "yes" ; then
  echo "BUILD_SHARED=yes" >> config.mak
else
  echo "BUILD_SHARED=no" >> config.mak
fi
echo "EXTRALIBS=$extralibs" >> config.mak
echo -n "VERSION=" >>config.mak
head VERSION >>config.mak
echo "" >>config.mak
# if you do not want to use encoders, disable that.
echo "#define CONFIG_ENCODERS 1" >> $TMPH
echo "CONFIG_ENCODERS=yes" >> config.mak

# if you do not want to use decoders, disable that.
echo "#define CONFIG_DECODERS 1" >> $TMPH
echo "CONFIG_DECODERS=yes" >> config.mak

# special AC3 stuff in case you already have it
# without libavcodec.
echo "#define CONFIG_AC3 1" >> $TMPH
echo "CONFIG_AC3=yes" >> config.mak

if test "$a52bin" = "yes" ; then
  echo "#define CONFIG_A52BIN 1" >> $TMPH
  echo "CONFIG_A52BIN=yes" >> config.mak
else
  echo "CONFIG_A52BIN=no" >> config.mak
fi

if test "$grab" = "yes" ; then
  echo "#define CONFIG_GRAB 1" >> $TMPH
  echo "CONFIG_GRAB=yes" >> config.mak
fi

if test "$mp3lame" = "yes" ; then
  echo "#define CONFIG_MP3LAME 1" >> $TMPH
  echo "CONFIG_MP3LAME=yes" >> config.mak
fi

if test "$win32" = "yes" ; then
  echo "#define CONFIG_WIN32 1" >> $TMPH
  echo "CONFIG_WIN32=yes" >> config.mak
fi

if test "$_malloc_h" = "yes" ; then
  echo "#define HAVE_MALLOC_H 1" >> $TMPH
else
  echo "#undef  HAVE_MALLOC_H" >> $TMPH
fi

if test "$_memalign" = "yes" ; then
  echo "#define HAVE_MEMALIGN 1" >> $TMPH
else
  echo "#undef  HAVE_MEMALIGN" >> $TMPH
fi

if test "$simpleidct" = "yes" ; then
  echo "#define SIMPLE_IDCT 1" >> $TMPH
fi

diff $TMPH config.h >/dev/null 2>&1
if test $? -ne 0 ; then
	mv -f $TMPH config.h
else
	echo "config.h is unchanged"
fi

rm -f $TMPO $TMPC $TMPS $TMPH