ref: d6e47684f70c9ca1ffb9cd48c82f9513ef88eddd
dir: /m4/ffmpeg.m4/
dnl SOX_PATH_FFMPEG dnl cbagwell@users.sourceforge.net 1-3-2007 dnl # SOX_PATH_FFMPEG([ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]) # Test for libavformat, and define FFMPEG_CFLAGS and FFMPEG_LIBS AC_DEFUN([SOX_PATH_FFMPEG], [dnl # Step 1: Use PKG_CHECK_MODULES if available m4_ifdef([PKG_CHECK_MODULES], [# PKG_CHECK_MODULES available PKG_CHECK_MODULES(FFMPEG, [libavformat libavcodec libavutil], have_ffmpeg="maybe", have_ffmpeg="no")], [# Step 2: Use pkg-config manually if available AC_PATH_PROG([PKGCONFIG], [pkg-config], [none]) if test "$PKGCONFIG" != "none" && `$PKGCONFIG --exists libavformat libavcodec libavutil` then FFMPEG_CFLAGS=`$PKGCONFIG --cflags libavformat` FFMPEG_LIBS=`$PKGCONFIG --libs libavformat libavcodec libavutil` have_ffmpeg="maybe" else have_ffmpeg="no" fi]) # Step 3: Even if pkg-config says its not installed, user may have # manually installed libraries with no pkg-config support if test "$have_ffmpeg" = "no" then # Some packages distribute a <package>-config which we could check # for but libavformat doesn't have that. We could use AC_PATH_PROG() # similar to above for finding pkg-config. # As a last resort, just hope that header and library can # be found in default paths and that it doesn't need # to link against any other libraries. FFMPEG_LIBS="-lavformat -lavcodec -lavutil" have_ffmpeg="maybe" fi # Even if pkg-config or similar told us how to find the library, # do a safety check. if test "$have_ffmpeg" != "no" then ac_save_CFLAGS="$CFLAGS" ac_save_CPPFLAGS="$CPPFLAGS" ac_save_LIBS="$LIBS" CFLAGS="$CFLAGS $FFMPEG_CFLAGS" CPPFLAGS="$CPPFLAGS $FFMPEG_CFLAGS" LIBS="$LIBS $FFMPEG_LIBS" have_ffmpeg="no" AC_CHECK_HEADERS([libavformat/avformat.h ffmpeg/avformat.h], [AC_CHECK_LIB(avformat, av_open_input_file, [AC_CHECK_HEADERS([libavcodec/avcodec.h ffmpeg/avcodec.h], [AC_CHECK_LIB(avcodec, avcodec_decode_audio3, have_ffmpeg=yes)])]) break]) CFLAGS="$ac_save_CFLAGS" CPPFAGS="$ac_save_CPPFLAGS" LIBS="$ac_save_LIBS" fi if test "$have_ffmpeg" != "yes" then ifelse([$2], , :, [$2]) fi ])dnl SOX_PATH_FFMPEG