--disable-avdevice disable libavdevice build
--disable-avcodec disable libavcodec build
--disable-avformat disable libavformat build
+ --disable-swresample disable libswresample build
--disable-swscale disable libswscale build
--disable-postproc disable libpostproc build
--disable-avfilter disable video filter support [no]
--enable-bzlib enable bzlib [autodetect]
--enable-libcelt enable CELT/Opus decoding via libcelt [no]
--enable-frei0r enable frei0r video filtering
+ --enable-libaacplus enable AAC+ encoding via libaacplus [no]
--enable-libopencore-amrnb enable AMR-NB de/encoding via libopencore-amrnb [no]
--enable-libopencore-amrwb enable AMR-WB decoding via libopencore-amrwb [no]
--enable-libopencv enable video filtering via libopencv [no]
+ --enable-libcdio enable audio CD grabbing with libcdio
--enable-libdc1394 enable IIDC-1394 grabbing using libdc1394
and libraw1394 [no]
--enable-libdirac enable Dirac support via libdirac [no]
--enable-libfaac enable FAAC support via libfaac [no]
--enable-libfreetype enable libfreetype [no]
--enable-libgsm enable GSM support via libgsm [no]
+ --enable-libmodplug enable ModPlug via libmodplug [no]
--enable-libmp3lame enable MP3 encoding via libmp3lame [no]
--enable-libnut enable NUT (de)muxing via libnut,
native (de)muxer exists [no]
--enable-libopenjpeg enable JPEG 2000 decoding via OpenJPEG [no]
--enable-librtmp enable RTMP[E] support via librtmp [no]
--enable-libschroedinger enable Dirac support via libschroedinger [no]
- --enable-libspeex enable Speex decoding via libspeex [no]
+ --enable-libspeex enable Speex support via libspeex [no]
+ --enable-libstagefright-h264 enable H.264 decoding via libstagefright [no]
--enable-libtheora enable Theora encoding via libtheora [no]
+ --enable-libutvideo enable Ut Video decoding via libutvideo [no]
--enable-libvo-aacenc enable AAC encoding via libvo-aacenc [no]
--enable-libvo-amrwbenc enable AMR-WB encoding via libvo-amrwbenc [no]
--enable-libvorbis enable Vorbis encoding via libvorbis,
--ar=AR use archive tool AR [$ar_default]
--as=AS use assembler AS [$as_default]
--cc=CC use C compiler CC [$cc_default]
+ --cxx=CXX use C compiler CXX [$cxx_default]
--ld=LD use linker LD
--host-cc=HOSTCC use host C compiler HOSTCC
--host-cflags=HCFLAGS use HCFLAGS when compiling for host
--host-ldflags=HLDFLAGS use HLDFLAGS when linking for host
--host-libs=HLIBS use libs HLIBS when linking for host
--extra-cflags=ECFLAGS add ECFLAGS to CFLAGS [$CFLAGS]
+ --extra-cxxflags=ECFLAGS add ECFLAGS to CXXFLAGS [$CXXFLAGS]
--extra-ldflags=ELDFLAGS add ELDFLAGS to LDFLAGS [$LDFLAGS]
--extra-libs=ELIBS add ELIBS [$ELIBS]
--extra-version=STRING version string suffix []
append CFLAGS $($filter_cflags "$@")
}
+add_cxxflags(){
+ append CXXFLAGS $($filter_cflags "$@")
+}
+
add_asflags(){
append ASFLAGS $($filter_asflags "$@")
}
check_cmd $cc $CPPFLAGS $CFLAGS "$@" -c -o $TMPO $TMPC
}
+check_cxx(){
+ log check_cxx "$@"
+ cat > $TMPCPP
+ log_file $TMPCPP
+ check_cmd $cxx $CPPFLAGS $CFLAGS $CXXFLAGS "$@" -c -o $TMPO $TMPCPP
+}
+
check_cpp(){
log check_cpp "$@"
cat > $TMPC
check_ld(){
log check_ld "$@"
+ type=$1
+ shift 1
flags=''
libs=''
for f; do
test "${f}" = "${f#-l}" && flags="$flags $f" || libs="$libs $f"
done
- check_cc $($filter_cflags $flags) || return
+ check_$type $($filter_cflags $flags) || return
check_cmd $ld $LDFLAGS $flags -o $TMPE $TMPO $libs $extralibs
}
EOF
}
+check_cxxflags(){
+ log check_cxxflags "$@"
+ set -- $($filter_cflags "$@")
+ check_cxx "$@" <<EOF && append CXXFLAGS "$@"
+int x;
+EOF
+}
+
test_ldflags(){
log test_ldflags "$@"
- check_ld "$@" <<EOF
+ check_ld "cc" "$@" <<EOF
int main(void){ return 0; }
EOF
}
func=$1
shift
disable $func
- check_ld "$@" <<EOF && enable $func
+ check_ld "cc" "$@" <<EOF && enable $func
extern int $func();
int main(void){ $func(); }
EOF
func=$1
shift
disable $func
- check_ld "$@" <<EOF && enable $func
+ check_ld "cc" "$@" <<EOF && enable $func
#include <math.h>
float foo(float f) { return $func(f); }
-int main(void){ return 0; }
+int main(void){ return (int) foo; }
EOF
}
echo "long check_$func(void) { return (long) $func; }"
done
echo "int main(void) { return 0; }"
- } | check_ld "$@" && enable $funcs && enable_safe $headers
+ } | check_ld "cc" "$@" && enable $funcs && enable_safe $headers
+}
+
+check_class_headers_cpp(){
+ log check_class_headers_cpp "$@"
+ headers=$1
+ classes=$2
+ shift 2
+ {
+ for hdr in $headers; do
+ echo "#include <$hdr>"
+ done
+ echo "int main(void) { "
+ i=1
+ for class in $classes; do
+ echo "$class obj$i;"
+ i=$(expr $i + 1)
+ done
+ echo "return 0; }"
+ } | check_ld "cxx" "$@" && enable $funcs && enable_safe $headers
}
check_cpp_condition(){
check_func_headers "$headers" "$funcs" "$@" && add_extralibs "$@"
}
+check_lib_cpp(){
+ log check_lib_cpp "$@"
+ headers="$1"
+ classes="$2"
+ shift 2
+ check_class_headers_cpp "$headers" "$classes" "$@" && add_extralibs "$@"
+}
+
check_pkg_config(){
log check_pkg_config "$@"
pkg="$1"
}
check_exec(){
- check_ld "$@" && { enabled cross_compile || $TMPE >> $logfile 2>&1; }
+ check_ld "cc" "$@" && { enabled cross_compile || $TMPE >> $logfile 2>&1; }
}
check_exec_crash(){
check_lib2 "$headers" $func "$@" || die "ERROR: $name not found"
}
+require_cpp(){
+ name="$1"
+ headers="$2"
+ classes="$3"
+ shift 3
+ check_lib_cpp "$headers" "$classes" "$@" || die "ERROR: $name not found"
+}
+
require_pkg_config(){
pkg="$1"
check_pkg_config "$@" || die "ERROR: $pkg not found"
h264pred
hardcoded_tables
huffman
+ libaacplus
+ libcdio
libcelt
libdc1394
libdirac
libfaac
libfreetype
libgsm
+ libmodplug
libmp3lame
libnut
libopencore_amrnb
librtmp
libschroedinger
libspeex
+ libstagefright_h264
libtheora
+ libutvideo
libvo_aacenc
libvo_amrwbenc
libvorbis
small
sram
static
+ swresample
swscale
swscale_alpha
thumb
alsa_asoundlib_h
altivec_h
arpa_inet_h
+ asm_mod_y
attribute_may_alias
attribute_packed
bswap
setrlimit
strerror_r
strptime
- strtok_r
struct_addrinfo
struct_ipv6_mreq
struct_sockaddr_in6
cc
cpu
cross_prefix
+ cxx
dep_cc
extra_version
host_cc
CMDLINE_APPEND="
extra_cflags
+ extra_cxxflags
"
# code dependency declarations
twinvq_decoder_select="mdct lsp sinewin"
vc1_decoder_select="h263_decoder"
vc1_crystalhd_decoder_select="crystalhd"
-vc1_dxva2_hwaccel_deps="dxva2api_h DXVA_PictureParameters_wDecodedPictureIndex"
+vc1_dxva2_hwaccel_deps="dxva2api_h"
vc1_dxva2_hwaccel_select="dxva2 vc1_decoder"
vc1_vaapi_hwaccel_select="vaapi vc1_decoder"
vc1_vdpau_decoder_select="vdpau vc1_decoder"
h264_parser_select="golomb h264dsp h264pred"
# external libraries
+libaacplus_encoder_deps="libaacplus"
libcelt_decoder_deps="libcelt"
libdirac_decoder_deps="libdirac !libschroedinger"
libdirac_encoder_deps="libdirac"
libgsm_encoder_deps="libgsm"
libgsm_ms_decoder_deps="libgsm"
libgsm_ms_encoder_deps="libgsm"
+libmodplug_demuxer_deps="libmodplug"
libmp3lame_encoder_deps="libmp3lame"
libopencore_amrnb_decoder_deps="libopencore_amrnb"
libopencore_amrnb_encoder_deps="libopencore_amrnb"
libschroedinger_decoder_deps="libschroedinger"
libschroedinger_encoder_deps="libschroedinger"
libspeex_decoder_deps="libspeex"
+libspeex_encoder_deps="libspeex"
+libstagefright_h264_decoder_deps="libstagefright_h264"
libtheora_encoder_deps="libtheora"
libvo_aacenc_encoder_deps="libvo_aacenc"
libvo_amrwbenc_encoder_deps="libvo_amrwbenc"
libx264_encoder_deps="libx264"
libxavs_encoder_deps="libxavs"
libxvid_encoder_deps="libxvid"
+libutvideo_decoder_deps="libutvideo gpl"
# demuxers / muxers
ac3_demuxer_select="ac3_parser"
fbdev_indev_deps="linux_fb_h"
jack_indev_deps="jack_jack_h sem_timedwait"
lavfi_indev_deps="avfilter"
+libcdio_indev_deps="libcdio"
libdc1394_indev_deps="libdc1394"
openal_indev_deps="openal"
oss_indev_deps_any="soundcard_h sys_soundcard_h"
udp_protocol_deps="network"
# filters
-abuffer_filter_deps="strtok_r"
-aformat_filter_deps="strtok_r"
amovie_filter_deps="avcodec avformat"
blackframe_filter_deps="gpl"
boxblur_filter_deps="gpl"
cropdetect_filter_deps="gpl"
delogo_filter_deps="gpl"
drawtext_filter_deps="libfreetype"
-frei0r_filter_deps="frei0r dlopen strtok_r"
-frei0r_src_filter_deps="frei0r dlopen strtok_r"
+frei0r_filter_deps="frei0r dlopen"
+frei0r_src_filter_deps="frei0r dlopen"
hqdn3d_filter_deps="gpl"
movie_filter_deps="avcodec avformat"
mp_filter_deps="gpl avcodec"
postproc_deps="gpl"
# programs
-ffmpeg_deps="avcodec avformat swscale"
+ffmpeg_deps="avcodec avformat swscale swresample"
ffmpeg_select="buffer_filter buffersink_filter"
avconv_deps="avcodec avformat swscale"
avconv_select="buffer_filter"
dep=${v%=*}
tests=${v#*=}
for name in ${tests}; do
- eval ${name}_test_deps="'${dep}$suf1 ${dep}$suf2'"
+ append ${name}_test_deps ${dep}$suf1 ${dep}$suf2
done
done
}
+mxf_d10_test_deps="avfilter"
+seek_lavf_mxf_d10_test_deps="mxf_d10_test"
+
test_deps _encoder _decoder \
adpcm_g726=g726 \
adpcm_ima_qt \
# toolchain
ar_default="ar"
cc_default="gcc"
+cxx_default="g++"
cc_version=\"unknown\"
host_cc_default="gcc"
install="install"
enable protocols
enable static
enable stripping
+enable swresample
enable swscale
enable swscale_alpha
AS_O='-o $@'
CC_O='-o $@'
+CXX_O='-o $@'
host_cflags='-D_ISOC99_SOURCE -O3 -g'
host_libs='-lm'
ar_default="${cross_prefix}${ar_default}"
cc_default="${cross_prefix}${cc_default}"
+cxx_default="${cross_prefix}${cxx_default}"
nm_default="${cross_prefix}${nm_default}"
pkg_config_default="${cross_prefix}${pkg_config_default}"
ranlib="${cross_prefix}${ranlib}"
sysinclude_default="${sysroot}/usr/include"
-set_default cc nm pkg_config strip sysinclude
+set_default cc cxx nm pkg_config strip sysinclude
enabled cross_compile || host_cc_default=$cc
set_default host_cc
trap 'rm -f -- $TMPFILES' EXIT
tmpfile TMPC .c
+tmpfile TMPCPP .cpp
tmpfile TMPE $EXESUF
tmpfile TMPH .h
tmpfile TMPO .o
set_default ar as dep_cc ld
test -n "$CC_DEPFLAGS" || CCDEP=$DEPEND_CMD
+test -n "$CXX_DEPFLAGS" || CXXDEP=$DEPEND_CMD
test -n "$AS_DEPFLAGS" || ASDEP=$DEPEND_CMD
add_cflags $extra_cflags
+add_cxxflags $extra_cxxflags
add_asflags $extra_cflags
if test -n "$sysroot"; then
fi
add_cppflags -D_ISOC99_SOURCE
+add_cxxflags -D__STDC_CONSTANT_MACROS
check_cflags -std=c99
check_cc -D_FILE_OFFSET_BITS=64 <<EOF && add_cppflags -D_FILE_OFFSET_BITS=64
#include <stdlib.h>
enabled x86 && SHFLAGS="-mimpure-text $SHFLAGS"
network_extralibs="-lsocket -lnsl"
add_cppflags -D__EXTENSIONS__
+ # When using suncc to build, the Solaris linker will mark
+ # an executable with each instruction set encountered by
+ # the Solaris assembler. As our libraries contain their own
+ # guards for processor-specific code, instead suppress
+ # generation of the HWCAPS ELF section on Solaris x86 only.
+ enabled_all suncc x86 && echo "hwcap_1 = OVERRIDE;" > mapfile && add_ldflags -Wl,-M,mapfile
nm_opts='-P -g'
;;
netbsd)
enabled $1 || { enabled $2 && die "$2 is $1 and --enable-$1 is not specified."; }
}
+die_license_disabled gpl libcdio
die_license_disabled gpl libx264
die_license_disabled gpl libxavs
die_license_disabled gpl libxvid
die_license_disabled gpl x11grab
+die_license_disabled nonfree libaacplus
die_license_disabled nonfree libfaac
die_license_disabled version3 libopencore_amrnb
elif ! check_cpp_condition stddef.h "defined __ARM_PCS || defined __SOFTFP__"; then
case "${cross_prefix:-$cc}" in
*hardfloat*) enable vfp_args; fpabi=vfp ;;
- *) check_ld <<EOF && enable vfp_args && fpabi=vfp || fpabi=soft ;;
+ *) check_ld "cc" <<EOF && enable vfp_args && fpabi=vfp || fpabi=soft ;;
__asm__ (".eabi_attribute 28, 1");
int main(void) { return 0; }
EOF
enabled neon && check_asm neon '"vadd.i16 q0, q0, q0"'
enabled vfpv3 && check_asm vfpv3 '"vmov.f32 s0, #1.0"'
+ check_asm asm_mod_y '"vmul.i32 d0, d0, %y0" :: "x"(0)'
+
enabled_all armv6t2 shared !pic && enable_pic
elif enabled mips; then
check_func setrlimit
check_func strerror_r
check_func strptime
-check_func strtok_r
check_func_headers conio.h kbhit
check_func_headers windows.h PeekNamedPipe
check_func_headers io.h setmode
check_func_headers windows.h VirtualAlloc
check_header dlfcn.h
-check_header dxva2api.h
+check_header dxva2api.h -D_WIN32_WINNT=0x0600
check_header libcrystalhd/libcrystalhd_if.h
check_header malloc.h
check_header poll.h
check_header vdpau/vdpau_x11.h
check_header X11/extensions/XvMClib.h
-check_struct dxva2api.h DXVA_PictureParameters wDecodedPictureIndex
-
disabled zlib || check_lib zlib.h zlibVersion -lz || disable zlib
disabled bzlib || check_lib2 bzlib.h BZ2_bzlibVersion -lbz2 || disable bzlib
enabled avisynth && require2 vfw32 "windows.h vfw.h" AVIFileInit -lavifil32
enabled libcelt && require libcelt celt/celt.h celt_decode -lcelt0
enabled frei0r && { check_header frei0r.h || die "ERROR: frei0r.h header not found"; }
+enabled libaacplus && require "libaacplus >= 2.0.0" aacplus.h aacplusEncOpen -laacplus
enabled libdc1394 && require_pkg_config libdc1394-2 dc1394/dc1394.h dc1394_new
enabled libdirac && require_pkg_config dirac \
"libdirac_decoder/dirac_parser.h libdirac_encoder/dirac_encoder.h" \
enabled libfaac && require2 libfaac "stdint.h faac.h" faacEncGetVersion -lfaac
enabled libfreetype && require_pkg_config freetype2 "ft2build.h freetype/freetype.h" FT_Init_FreeType
enabled libgsm && require libgsm gsm/gsm.h gsm_create -lgsm
+enabled libmodplug && require libmodplug libmodplug/modplug.h ModPlug_Load -lmodplug
enabled libmp3lame && require "libmp3lame >= 3.98.3" lame/lame.h lame_set_VBR_quality -lmp3lame
enabled libnut && require libnut libnut.h nut_demuxer_init -lnut
enabled libopencore_amrnb && require libopencore_amrnb opencore-amrnb/interf_dec.h Decoder_Interface_init -lopencore-amrnb
enabled librtmp && require_pkg_config librtmp librtmp/rtmp.h RTMP_Socket
enabled libschroedinger && require_pkg_config schroedinger-1.0 schroedinger/schro.h schro_init
enabled libspeex && require libspeex speex/speex.h speex_decoder_init -lspeex
+enabled libstagefright_h264 && require_cpp libstagefright_h264 "binder/ProcessState.h media/stagefright/MetaData.h
+ media/stagefright/MediaBufferGroup.h media/stagefright/MediaDebug.h media/stagefright/MediaDefs.h
+ media/stagefright/OMXClient.h media/stagefright/OMXCodec.h" android::OMXClient -lstagefright -lmedia -lutils -lbinder
enabled libtheora && require libtheora theora/theoraenc.h th_info_init -ltheoraenc -ltheoradec -logg
+enabled libutvideo && require_cpp utvideo "stdint.h stdlib.h utvideo/utvideo.h utvideo/Codec.h" 'CCodec*' -lutvideo -lstdc++
enabled libvo_aacenc && require libvo_aacenc vo-aacenc/voAAC.h voGetAACEncAPI -lvo-aacenc
enabled libvo_amrwbenc && require libvo_amrwbenc vo-amrwbenc/enc_if.h E_IF_init -lvo-amrwbenc
enabled libvorbis && require libvorbis vorbis/vorbisenc.h vorbis_info_init -lvorbisenc -lvorbis -logg
enabled libvpx_encoder && { check_lib2 "vpx/vpx_encoder.h vpx/vp8cx.h" "vpx_codec_enc_init_ver VPX_CQ" -lvpx ||
die "ERROR: libvpx encoder version must be >=0.9.6"; } }
enabled libx264 && require libx264 x264.h x264_encoder_encode -lx264 &&
- { check_cpp_condition x264.h "X264_BUILD >= 115" ||
- die "ERROR: libx264 version must be >= 0.115."; }
+ { check_cpp_condition x264.h "X264_BUILD >= 118" ||
+ die "ERROR: libx264 version must be >= 0.118."; }
enabled libxavs && require libxavs xavs.h xavs_encoder_encode -lxavs
enabled libxvid && require libxvid xvid.h xvid_global -lxvidcore
enabled openal && { { for al_libs in "${OPENAL_LIBS}" "-lopenal" "-lOpenAL32"; do
enabled_any sndio_indev sndio_outdev && check_lib2 sndio.h sio_open -lsndio
+enabled libcdio &&
+ check_lib2 "cdio/cdda.h cdio/paranoia.h" cdio_cddap_open "-lcdio_paranoia -lcdio_cdda -lcdio"
+
enabled x11grab &&
check_header X11/Xlib.h &&
check_header X11/extensions/XShm.h &&
check_cflags -Wundef
check_cflags -Wmissing-prototypes
check_cflags -Wno-pointer-to-int-cast
+check_cflags -Wstrict-prototypes
enabled extra_warnings && check_cflags -Winline
# add some linker flags
check_ldflags -Wl,--warn-common
-check_ldflags -Wl,-rpath-link=libpostproc:libswscale:libavfilter:libavdevice:libavformat:libavcodec:libavutil
+check_ldflags -Wl,-rpath-link=libpostproc:libswresample:libswscale:libavfilter:libavdevice:libavformat:libavcodec:libavutil
test_ldflags -Wl,-Bsymbolic && append SHFLAGS -Wl,-Bsymbolic
echo "X{};" > $TMPV
fi
check_cflags -fno-math-errno
check_cflags -fno-signed-zeros
+check_cc -mno-red-zone <<EOF && noredzone_flags="-mno-red-zone"
+int x;
+EOF
+
if enabled icc; then
# Just warnings, no remarks
enabled asm || { arch=c; disable $ARCH_LIST $ARCH_EXT_LIST; }
-if test $target_os == "haiku"; then
+if test $target_os = "haiku"; then
disable memalign
disable posix_memalign
fi
echo "AVISynth enabled ${avisynth-no}"
echo "libcelt enabled ${libcelt-no}"
echo "frei0r enabled ${frei0r-no}"
+echo "libcdio support ${libcdio-no}"
echo "libdc1394 support ${libdc1394-no}"
echo "libdirac enabled ${libdirac-no}"
echo "libfaac enabled ${libfaac-no}"
+echo "libaacplus enabled ${libaacplus-no}"
echo "libgsm enabled ${libgsm-no}"
+echo "libmodplug enabled ${libmodplug-no}"
echo "libmp3lame enabled ${libmp3lame-no}"
echo "libnut enabled ${libnut-no}"
echo "libopencore-amrnb support ${libopencore_amrnb-no}"
echo "librtmp enabled ${librtmp-no}"
echo "libschroedinger enabled ${libschroedinger-no}"
echo "libspeex enabled ${libspeex-no}"
+echo "libstagefright-h264 enabled ${libstagefright_h264-no}"
echo "libtheora enabled ${libtheora-no}"
+echo "libutvideo enabled ${libutvideo-no}"
echo "libvo-aacenc support ${libvo_aacenc-no}"
echo "libvo-amrwbenc support ${libvo_amrwbenc-no}"
echo "libvorbis enabled ${libvorbis-no}"
CC_IDENT=$cc_ident
ARCH=$arch
CC=$cc
+CXX=$cxx
AS=$as
LD=$ld
DEPCC=$dep_cc
STRIP=$strip
CPPFLAGS=$CPPFLAGS
CFLAGS=$CFLAGS
+CXXFLAGS=$CXXFLAGS
ASFLAGS=$ASFLAGS
AS_O=$CC_O
CC_O=$CC_O
+CXX_O=$CXX_O
LDFLAGS=$LDFLAGS
FFSERVERLDFLAGS=$FFSERVERLDFLAGS
SHFLAGS=$SHFLAGS
EXTRA_VERSION=$extra_version
DEPFLAGS=$DEPFLAGS
CCDEP=$CCDEP
+CXXDEP=$CXXDEP
ASDEP=$ASDEP
CC_DEPFLAGS=$CC_DEPFLAGS
AS_DEPFLAGS=$AS_DEPFLAGS
SLIB_INSTALL_EXTRA_LIB=${SLIB_INSTALL_EXTRA_LIB}
SLIB_INSTALL_EXTRA_SHLIB=${SLIB_INSTALL_EXTRA_SHLIB}
SAMPLES:=${samples:-\$(FATE_SAMPLES)}
+NOREDZONE_FLAGS=$noredzone_flags
EOF
get_version(){
}
get_version LIBSWSCALE libswscale/swscale.h
+get_version LIBSWRESAMPLE libswresample/swresample.h
get_version LIBPOSTPROC libpostproc/postprocess.h
get_version LIBAVCODEC libavcodec/version.h
get_version LIBAVDEVICE libavdevice/avdevice.h
pkgconfig_generate libavfilter "FFmpeg video filtering library" "$LIBAVFILTER_VERSION" "$extralibs"
pkgconfig_generate libpostproc "FFmpeg postprocessing library" "$LIBPOSTPROC_VERSION" "" "libavutil = $LIBAVUTIL_VERSION"
pkgconfig_generate libswscale "FFmpeg image rescaling library" "$LIBSWSCALE_VERSION" "$LIBM" "libavutil = $LIBAVUTIL_VERSION"
+pkgconfig_generate libswresample "FFmpeg audio rescaling library" "$LIBSWRESAMPLE_VERSION" "$LIBM" "libavutil = $LIBAVUTIL_VERSION"