sidplay: new decoder plugin for playing C64 SID files

configure.ac

@@ -412,6 +412,11 @@ AC_ARG_WITH(tremor,[[  --with-tremor[=PFX]         Use Tremor(vorbisidec) intege
 AC_ARG_WITH(tremor-libraries,[  --with-tremor-libraries=DIR Directory where Tremor library is installed (optional)], tremor_libraries="$withval", tremor_libraries="")
 AC_ARG_WITH(tremor-includes,[  --with-tremor-includes=DIR  Directory where Tremor header files are installed (optional)], tremor_includes="$withval", tremor_includes="")
 
+AC_ARG_ENABLE(sidplay,
+	AS_HELP_STRING([--enable-sidplay],
+		[enable C64 SID support via libsidplay2 (default: disable)]),,
+	enable_sidplay=no)
+
 AC_ARG_ENABLE(wavpack,
 	AS_HELP_STRING([--disable-wavpack],
 		[disable WavPack support (default: enable)]),
@@ -1004,6 +1009,20 @@ fi
 
 AM_CONDITIONAL(HAVE_FFMPEG, test x$enable_ffmpeg = xyes)
 
+if test x$enable_sidplay = xyes; then
+	# libsidplay2 exposes a C++ interface
+	AC_PROG_CXX
+
+	# we have no test yet.. we're not using pkg-config here
+	# because libsidplay2's .pc file requires libtool
+	AC_SUBST(SIDPLAY_LIBS,"-lsidplay2 -lresid-builder")
+	AC_SUBST(SIDPLAY_CFLAGS,)
+
+	AC_DEFINE(ENABLE_SIDPLAY, 1, [Define for libsidplay2 support]),
+fi
+
+AM_CONDITIONAL(ENABLE_SIDPLAY, test x$enable_sidplay = xyes)
+
 
 dnl
 dnl Documentation
@@ -1283,6 +1302,12 @@ else
 	echo " MODPLUG support ...............disabled"
 fi
 
+if test x$enable_sidplay = xyes; then
+	echo " C64 SID support ...............enabled"
+else
+	echo " C64 SID support ...............disabled"
+fi
+
 if test x$enable_ffmpeg = xyes; then
 	echo " FFMPEG support ................enabled"
 else
@@ -1300,6 +1325,7 @@ if
 	test x$enable_wavpack = xno &&
 	test x$enable_ffmpeg = xno &&
 	test x$enable_modplug = xno &&
+	test x$enable_sidplay = xno &&
 	test x$enable_mod = xno; then
 	AC_MSG_ERROR([No input plugins supported!])
 fi