configure

ffmpeg源码分析

  ;;
  --enable-pp) pp="yes"
  ;;
  --enable-libgsm) libgsm="yes"
    extralibs="$extralibs -lgsm"
  ;;
  --enable-mp3lame) mp3lame="yes"
    extralibs="$extralibs -lmp3lame"
  ;;
  --enable-libogg) libogg="yes"
    extralibs="$extralibs -logg"
    pkg_requires="$pkg_requires ogg >= 1.1"
  ;;
  --enable-vorbis) vorbis="yes"
    extralibs="$extralibs -lvorbis -lvorbisenc"
    pkg_requires="$pkg_requires vorbis vorbisenc"
  ;;
  --enable-theora) theora="yes"
    extralibs="$extralibs -ltheora"
    pkg_requires="$pkg_requires theora"
  ;;
  --enable-faad) faad="yes"
    extralibs="$extralibs -lfaad"
  ;;
  --enable-faadbin) faadbin="yes"
  ;;
  --enable-faac) faac="yes"
    extralibs="$extralibs -lfaac"
  ;;
  --enable-xvid) xvid="yes"
    extralibs="$extralibs -lxvidcore"
  ;;
  --enable-x264) x264="yes"
    extralibs="$extralibs -lx264"
  ;;
  --enable-dc1394) dc1394="yes"
    extralibs="$extralibs -ldc1394_control -lraw1394"
    pkg_requires="$pkg_requires libraw1394"
  ;;
  --disable-vhook) vhook="no"
  ;;
  --disable-simple_idct) simpleidct="no"
  ;;
  --enable-mingw32) mingw32="yes"
  ;;
  --enable-mingwce) mingwce="yes"
  ;;
  --enable-static) lstatic="yes"
  ;;
  --disable-static) lstatic="no"
  ;;
  --enable-shared) lshared="yes"
  ;;
  --disable-shared) lshared="no"
  ;;
  --disable-debug) debug="no"
  ;;
  --disable-opts) optimize="no"
  ;;
  --disable-mpegaudio-hp) mpegaudio_hp="no"
  ;;
  --disable-protocols) protocols="no"; network="no"; ffserver="no"
  ;;
  --disable-ffserver) ffserver="no"
  ;;
  --disable-ffplay) ffplay="no"
  ;;
  --enable-small) optimize="small"
  ;;
  --enable-amr_nb) amr_nb="yes"
  ;;
  --enable-amr_nb-fixed) amr_nb_fixed="yes"
  ;;
  --enable-amr_wb) amr_wb="yes"
  ;;
  --enable-amr_if2) amr_if2="yes"
  ;;
  --enable-sunmlib) sunmlib="yes"
  ;;
  --enable-pthreads) pthreads="yes"
  ;;
  --enable-gpl) gpl="yes"
  ;;
  --enable-memalign-hack) memalignhack="yes"
  ;;
  --disable-strip) dostrip="no"
  ;;
  --enable-encoder=*) CODEC_LIST="$CODEC_LIST ${opt#--enable-encoder=}_encoder"
  ;;
  --enable-decoder=*) CODEC_LIST="$CODEC_LIST ${opt#--enable-decoder=}_decoder"
  ;;
  --disable-encoder=*) CODEC_LIST="`echo $CODEC_LIST | sed -e \"s#${opt#--disable-encoder=}_encoder##\"`"
  ;;
  --disable-decoder=*) CODEC_LIST="`echo $CODEC_LIST | sed -e \"s#${opt#--disable-decoder=}_decoder##\"`"
  ;;
  --disable-encoders) CODEC_LIST="`echo $CODEC_LIST | sed 's/[-_a-zA-Z0-9]*encoder//g'`"
  ;;
  --disable-decoders) CODEC_LIST="`echo $CODEC_LIST | sed 's/[-_a-zA-Z0-9]*decoder//g'`"
  ;;
  --disable-muxers) muxers="no"; ffserver="no"
  ;;
  --disable-demuxers) demuxers="no"
  ;;
  *)
  echo "Unknown option \"$opt\"."
  echo "See $0 --help for available options."
  exit 1
  ;;
  esac
done

# we need to build at least one lib type
if test "$lstatic" = "no" && test "$lshared" = "no" ; then
    cat <<EOF
At least one library type must be built.
Specify --enable-static to build the static libraries or --enable-shared to
build the shared libraries as well. To only build the shared libraries specify
--disable-static in addition to --enable-shared.
EOF
    exit 1;
fi

if test "$theora" = "yes" ; then
    if test "$libogg" = "no"; then
        echo "libogg must be enabled to enable Theora."
        fail="yes"
        theora="no"
    fi
fi

if test "$vorbis" = "yes" ; then
    if test "$libogg" = "no"; then
        echo "libogg must be enabled to enable Vorbis."
        fail="yes"
        vorbis="no"
    fi
fi

if test "$gpl" != "yes"; then
    if test "$pp" != "no"; then
        echo "The Postprocessing code is under GPL and --enable-gpl is not specified."
        fail="yes"
    fi

    if test "$a52" != "no" -o "$a52bin" != "no"; then
        echo "liba52 is under GPL and --enable-gpl is not specified."
        fail="yes"
    fi

    if test "$xvid" != "no"; then
        echo "libxvidcore is under GPL and --enable-gpl is not specified."
        fail="yes"
    fi

    if test "$x264" != "no"; then
        echo "x264 is under GPL and --enable-gpl is not specified."
        fail="yes"
    fi

    if test "$dts" != "no"; then
        echo "libdts is under GPL and --enable-gpl is not specified."
        fail="yes"
    fi

    if test "$faad" != "no" -o "$faadbin" != "no"; then
        cat > $TMPC << EOF
            #include <faad.h>
            int main( void ) { return 0; }
EOF

        if $cc $CFLAGS -o $TMPE $TMPC 2> /dev/null ; then
            cat > $TMPC << EOF
                #include <faad.h>
                #ifndef FAAD2_VERSION
                ok faad1
                #endif
                int main( void ) { return 0; }
EOF
            if $cc $CFLAGS -o $TMPE $TMPC 2> /dev/null ; then
                echo "FAAD2 is under GPL and --enable-gpl is not specified."
                fail="yes"
            fi
        else
            faad="no"
            faadbin="no"
            echo "FAAD test failed."
        fi
    fi


    if test "$fail" = "yes"; then
        exit 1
    fi
fi

# compute MMX state
if test $mmx = "default"; then
    if test $cpu = "x86" -o $cpu = "x86_64"; then
        mmx="yes"
    else
        mmx="no"
    fi
fi

# check iwmmxt support
if test $iwmmxt = "default" -a $cpu = "armv4l"; then
    cat > $TMPC << EOF
        int main(void) {
        __asm__ __volatile__ ("wunpckelub wr6, wr4");
        }
EOF

    iwmmxt=no
    if ${cross_prefix}${cc} -o $TMPO $TMPC 2> /dev/null ; then
        iwmmxt=yes
    fi
fi

#Darwin CC versions
needmdynamicnopic="no"
if test $targetos = Darwin; then
    if test -n "`$cc -v 2>&1 | grep xlc`"; then
        CFLAGS="$CFLAGS -qpdf2 -qlanglvl=extc99 -qmaxmem=-1 -qarch=auto -qtune=auto"
    else
        gcc_version="`$cc -v 2>&1 | grep version | cut -d ' ' -f3-`"
        case "$gcc_version" in
            *2.95*)
                CFLAGS="$CFLAGS -no-cpp-precomp -pipe -fomit-frame-pointer"
                ;;
            *[34].*)
                CFLAGS="$CFLAGS -no-cpp-precomp -pipe -fomit-frame-pointer -force_cpusubtype_ALL -Wno-sign-compare"
                if test "$lshared" = no; then
                   needmdynamicnopic="yes"
                fi
                ;;
            *)
                CFLAGS="$CFLAGS -no-cpp-precomp -pipe -fomit-frame-pointer"
                if test "$lshared" = no; then
                   needmdynamicnopic="yes"
                fi
                ;;
        esac
    fi
fi

# Can only do AltiVec on PowerPC
if test $altivec = "default"; then
    if test $cpu = "powerpc"; then
        altivec="yes"
    else
        altivec="no"
    fi
fi

# Add processor-specific flags
TUNECPU="generic"
POWERPCMODE="32bits"
if test $tune != "generic"; then
    case $tune in
        601|ppc601|PowerPC601)
            CFLAGS="$CFLAGS -mcpu=601"
            if test $altivec = "yes"; then
                echo "WARNING: Tuning for PPC601 but AltiVec enabled!";
            fi
            TUNECPU=ppc601
        ;;
        603*|ppc603*|PowerPC603*)
            CFLAGS="$CFLAGS -mcpu=603"
            if test $altivec = "yes"; then
                echo "WARNING: Tuning for PPC603 but AltiVec enabled!";
            fi
            TUNECPU=ppc603
        ;;
        604*|ppc604*|PowerPC604*)
            CFLAGS="$CFLAGS -mcpu=604"
            if test $altivec = "yes"; then
                echo "WARNING: Tuning for PPC604 but AltiVec enabled!";
            fi
            TUNECPU=ppc604
        ;;
        G3|g3|75*|ppc75*|PowerPC75*)
            CFLAGS="$CFLAGS -mcpu=750 -mtune=750 -mpowerpc-gfxopt"
            if test $altivec = "yes"; then
                echo "WARNING: Tuning for PPC75x but AltiVec enabled!";
            fi
            TUNECPU=ppc750
        ;;
        G4|g4|745*|ppc745*|PowerPC745*)
            CFLAGS="$CFLAGS -mcpu=7450 -mtune=7450 -mpowerpc-gfxopt"
            if test $altivec = "no"; then
                echo "WARNING: Tuning for PPC745x but AltiVec disabled!";
            fi
            TUNECPU=ppc7450
        ;;
        74*|ppc74*|PowerPC74*)
            CFLAGS="$CFLAGS -mcpu=7400 -mtune=7400 -mpowerpc-gfxopt"
            if test $altivec = "no"; then
                echo "WARNING: Tuning for PPC74xx but AltiVec disabled!";
            fi
            TUNECPU=ppc7400
        ;;
        G5|g5|970|ppc970|PowerPC970|power4*|Power4*)
            CFLAGS="$CFLAGS -mcpu=970 -mtune=970 -mpowerpc-gfxopt -mpowerpc64"
            if test $altivec = "no"; then
                echo "WARNING: Tuning for PPC970 but AltiVec disabled!";
            fi
            TUNECPU=ppc970
            POWERPCMODE="64bits"
        ;;
        i[3456]86|pentium|pentiumpro|pentium-mmx|pentium[234]|prescott|k6|k6-[23]|athlon|athlon-tbird|athlon-4|athlon-[mx]p|winchip-c6|winchip2|c3|nocona|athlon64|k8|opteron|athlon-fx)
            CFLAGS="$CFLAGS -march=$tune"
        ;;
        *)
        echo "WARNING: Unknown CPU \"$tune\", ignored."
        ;;
    esac
fi

# AltiVec flags: The FSF version of GCC differs from the Apple version
if test $cpu = "powerpc"; then
    if test $altivec = "yes"; then
        if test -n "`$cc -v 2>&1 | grep version | grep Apple`"; then
            CFLAGS="$CFLAGS -faltivec"
        else
            CFLAGS="$CFLAGS -maltivec -mabi=altivec"
        fi
    fi
fi

# check if we have <altivec.h>
cat > $TMPC << EOF
#include <altivec.h>
int main( void ) { return 0; }
EOF

_altivec_h="no"
if $cc $CFLAGS -o $TMPE $TMPC 2> /dev/null ; then
_altivec_h="yes"
fi

# check if our compiler supports Motorola AltiVec C API
if test $altivec = "yes"; then
if test $_altivec_h = "yes"; then
cat > $TMPC << EOF
#include <altivec.h>
int main(void) {
    vector signed int v1, v2, v3;
    v1 = vec_add(v2,v3);
    return 0;
}
EOF
else
cat > $TMPC << EOF
int main(void) {
    vector signed int v1, v2, v3;
    v1 = vec_add(v2,v3);
    return 0;
}
EOF
fi
$cc $CFLAGS -o $TMPE $TMPC 2> /dev/null || altivec="no"
fi

# mmi only available on mips
if test $mmi = "default"; then
    if test $cpu = "mips"; then
        mmi="yes"
    else
        mmi="no"
    fi
fi

# check if our compiler supports mmi
if test $mmi = "yes"; then
cat > $TMPC << EOF
int main(void) {
    __asm__ ("lq \$2, 0(\$2)");
    return 0;
}
EOF
$cc -o $TMPE $TMPC 2> /dev/null || mmi="no"
fi

if test "$mingw32" = "yes" -o "$mingwce" = "yes"; then
    if test "$lshared" = "yes" && test "$lstatic" = "yes" ; then
        cat <<EOF
You can only build one library type at once on MinGW.
Specify --disable-static --enable-shared to only build
the shared libraries. To build only the static libraries
you do not need to pass additional options.
EOF
        exit 1
    fi
    v4l="no"
    v4l2="no"
    bktr="no"
    audio_oss="no"
    dv1394="no"
    dc1394="no"
    ffserver="no"
    network="no"
if test "$mingwce" = "yes"; then
    protocols="no"
fi
    SLIBPREF=""
    SLIBSUF=".dll"
    EXESUF=".exe"
    if test "$force_prefix" != yes; then prefix="/c/Program Files/FFmpeg"; fi
    if test "$force_libdir" != yes; then bindir="$prefix"; fi
fi

cc="${cross_prefix}${cc}"
ar="${cross_prefix}${ar}"
ranlib="${cross_prefix}${ranlib}"
strip="${cross_prefix}${strip}"

if test -z "$cross_prefix" ; then

# ---
# big/little-endian test
cat > $TMPC << EOF
#include <inttypes.h>
int main(int argc, char ** argv){
        volatile uint32_t i=0x01234567;
        return (*((uint8_t*)(&i))) == 0x67;
}
EOF

if $cc -o $TMPE $TMPC 2>/dev/null ; then
$TMPE && bigendian="yes"
else
echo big/little test failed
fi

else

# programs cannot be launched if cross compiling, so make a static guess
if test "$cpu" = "powerpc" -o "$cpu" = "mips" ; then
    bigendian="yes"
fi

fi

# ---
# *inttypes.h* test
cat > $TMPC << EOF
#include <inttypes.h>
int main(int argc, char ** argv){
    return 0;
}
EOF

$cc -o $TMPE $TMPC 2>/dev/null || inttypes="no"

# ---
# *int_fast* test
cat > $TMPC << EOF
#include <inttypes.h>
int main(int argc, char ** argv){
        volatile uint_fast64_t i=0x01234567;
        return 0;
}
EOF

$cc -o $TMPE $TMPC 2>/dev/null || emu_fast_int="yes"

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

if test "$_memalign" = "no" -a "$mmx" = "yes" -a "$memalignhack" != "yes"; then
    echo "Error, no memalign() but SSE enabled, disable it or use --enable-memalign-hack."
    exit 1
fi

cat > $TMPC << EOF
#include <time.h>
int main( void ) { localtime_r(NULL, NULL); }
EOF

localtime_r=no
if $cc -o $TMPE $TMPC 2> /dev/null ; then
  localtime_r=yes
fi

if test "$zlib" = "yes"; then
# check for zlib - mmu_man
cat > $TMPC << EOF
#include <zlib.h>
int main ( void ) {
if (zlibVersion() != ZLIB_VERSION)
   puts("zlib version differs !!!");
   return 1;
return 0;
}
EOF
$cc $CFLAGS $LDFLAGS -o $TMPE $TMPC -lz 2> /dev/null || zlib="no"
# $TMPE 2> /dev/null > /dev/null || zlib="no"
# XXX: more tests needed - runtime test
fi
if test "$zlib" = "yes"; then
extralibs="$extralibs -lz"