mkvtoolnix/ac/flac.m4

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dnl
dnl Check for libFLAC
dnl
dnl FLAC 1.2.1 with mingw needs the winsock library.
flac_winsock=
if test "x$MINGW" = "x1" ; then
flac_winsock="-lwsock32"
fi
AC_ARG_WITH([flac],
AC_HELP_STRING([--without-flac], [do not build with flac support]),
[ with_flac=${withval} ], [ with_flac=yes ])
if test "$with_flac" != "no"; then
AC_CHECK_LIB(FLAC, FLAC__stream_decoder_new,
[ FLAC_LIBS="-lFLAC $OGG_LIBS -lm $flac_winsock"
flac_found=yes ],
[ flac_found=no ],
$OGG_LIBS -lm $flac_winsock)
else
flac_found=no
fi
if test "$flac_found" = "yes"; then
AC_CHECK_MEMBER(FLAC__StreamMetadata_StreamInfo.sample_rate, ,
[ flac_found=no ],
[ #include <FLAC/format.h>
])
fi
if test x"$flac_found" = xyes ; then
AC_CHECK_LIB(FLAC, FLAC__stream_decoder_skip_single_frame,
[ flac_decoder_skip_found=yes ],
[ flac_decoder_skip_found=no ],
$FLAC_LIBS)
if test x"$flac_decoder_skip_found" = xyes; then
opt_features_yes="$opt_features_yes\n * FLAC audio"
AC_DEFINE(HAVE_FLAC_DECODER_SKIP, [1], [Define if FLAC__stream_decoder_skip_single_frame exists])
AC_DEFINE(HAVE_FLAC_FORMAT_H, [1], [Define if the FLAC headers are present])
else
FLAC_LIBS=""
opt_features_no="$opt_features_no\n * FLAC audio (version too old)"
fi
else
FLAC_LIBS=""
opt_features_no="$opt_features_no\n * FLAC audio"
fi
AC_SUBST(FLAC_LIBS)