Make libvorbis/libmpg123 optional in autotools

BUILD.md

@@ -85,7 +85,7 @@ Requires the dev version of Audacious (and dependencies), automake/autoconf, and
 
 The plugin needs Audacious 3.5 or higher. New Audacious releases can break plugin compatibility so it may not work with the latest version unless adapted first.
 
-FFmpeg and other external libraries aren't enabled, thus some formats are not supported. libvorbis and libmpg123 can be disabled with -DVGM_DISABLE_VORBIS and -DVGM_DISABLE_MPEG.
+libvorbis and libmpg123 will be used if found, while FFmpeg and other external libraries aren't enabled, thus some formats won't work.
 
 Windows builds aren't supported at the moment (should be possible but there are complex dependency chains).
 

configure.ac

@@ -1,8 +1,8 @@
-dnl audacious-vgmstream m4 script 
+dnl automake-vgmstream m4 script 
 dnl Process this file with autoconf to produce a configure script.
 
 AC_PREREQ(2.53)
-AC_INIT(audacious-vgmstream,1.3.0)
+AC_INIT(automake-vgmstream,1.3.0)
 AM_INIT_AUTOMAKE([subdir-objects])
 AC_CONFIG_HEADERS(audacious/config.h)
 AM_DISABLE_STATIC
@@ -17,22 +17,28 @@ AM_PROG_LIBTOOL
 AC_PATH_X
 AC_PATH_XTRA
 
+have_vorbis=no
+PKG_CHECK_MODULES(VORBIS, [vorbis], have_vorbis=yes,
+        [AC_MSG_WARN([Cannot find libvorbis - will not enable Vorbis formats])]
+)
+AM_CONDITIONAL(HAVE_VORBIS, test "$have_vorbis" = yes)
+
+have_vorbisfile=no
+PKG_CHECK_MODULES(VORBISFILE, [vorbisfile], have_vorbisfile=yes,
+        [AC_MSG_WARN([Cannot find libvorbisfile - will not enable Vorbis formats])]
+)
+AM_CONDITIONAL(HAVE_VORBISFILE, test "$have_vorbisfile" = yes)
+
+have_libmpg123=no
+PKG_CHECK_MODULES(MPG123, [libmpg123], have_libmpg123=yes,
+        [AC_MSG_WARN([Cannot find libmpg123 - will not enable MPEG formats])]
+)
+AM_CONDITIONAL(HAVE_LIBMPG123, test "$have_libmpg123" = yes)
+
 PKG_CHECK_MODULES(AUDACIOUS, [audacious >= 3.5.0],,
         [AC_MSG_ERROR([Cannot find audacious >= 3.5.0 correctly installed])]
 )
 
-PKG_CHECK_MODULES(VORBIS, [vorbis],,
-        [AC_MSG_ERROR([Cannot find libvorbis])]
-)
-
-PKG_CHECK_MODULES(VORBISFILE, [vorbisfile],,
-        [AC_MSG_ERROR([Cannot find libvorbisfile])]
-)
-
-PKG_CHECK_MODULES(MPG123, [libmpg123],,
-        [AC_MSG_ERROR([Cannot find libmpg123])]
-)
-
 PKG_CHECK_MODULES(GTK, [glib-2.0 >= 2.6.0 gtk+-2.0 >= 2.6.0 gthread-2.0 pango],
     , [AC_MSG_ERROR([Cannot find glib2/gtk2/pango])]
 )

src/Makefile.autotools.am

@@ -11,6 +11,17 @@ SUBDIRS = coding layout meta
 libvgmstream_la_LDFLAGS = coding/libcoding.la layout/liblayout.la meta/libmeta.la
 libvgmstream_la_SOURCES = (auto-updated)
 libvgmstream_la_SOURCES += ../ext_libs/clHCA.c
-libvgmstream_la_LIBADD = $(AUDACIOUS_LIBS) $(GTK_LIBS) $(VORBISFILE_LIBS) $(VORBIS_LIBS) $(MPG123_LIBS) -lm
+libvgmstream_la_LIBADD = $(AUDACIOUS_LIBS) $(GTK_LIBS) -lm
 EXTRA_DIST = (auto-updated)
 EXTRA_DIST += ../ext_includes/clHCA.h
+
+if HAVE_VORBIS
+if HAVE_VORBISFILE
+AM_CFLAGS += -DVGM_USE_VORBIS
+libvgmstream_la_LIBADD += $(VORBISFILE_LIBS) $(VORBIS_LIBS)
+endif
+endif
+if HAVE_LIBMPG123
+AM_CFLAGS += -DVGM_USE_MPEG
+libvgmstream_la_LIBADD += $(MPG123_LIBS)
+endif

src/layout/Makefile.autotools.am

@@ -9,3 +9,12 @@ AM_MAKEFLAGS=-f Makefile.autotools
 liblayout_la_LDFLAGS =
 liblayout_la_SOURCES = (auto-updated)
 EXTRA_DIST = (auto-updated)
+
+if HAVE_VORBIS
+if HAVE_VORBISFILE
+AM_CFLAGS += -DVGM_USE_VORBIS
+endif
+endif
+if HAVE_LIBMPG123
+AM_CFLAGS += -DVGM_USE_MPEG
+endif

src/meta/Makefile.autotools.am

@@ -9,3 +9,12 @@ AM_MAKEFLAGS=-f Makefile.autotools
 libmeta_la_LDFLAGS =
 libmeta_la_SOURCES = (auto-updated)
 EXTRA_DIST = (auto-updated)
+
+if HAVE_VORBIS
+if HAVE_VORBISFILE
+AM_CFLAGS += -DVGM_USE_VORBIS
+endif
+endif
+if HAVE_LIBMPG123
+AM_CFLAGS += -DVGM_USE_MPEG
+endif