wasapi: build system integration

configure.ac

@@ -3496,6 +3496,25 @@ AS_IF([test "$enable_sndio" != "no"], [
 ])
 AM_CONDITIONAL([HAVE_SNDIO], [test "${have_sndio}" = "yes"])
 
+dnl
+dnl  Windows Audio Session plugin
+dnl
+AC_ARG_ENABLE([wasapi],
+  [AS_HELP_STRING([--enable-wasapi],
+    [use the Windows Audio Session API (default auto)])
+])
+have_wasapi="no"
+AS_IF([test "$enable_wasapi" != "no"], [
+  AC_CHECK_HEADER([audioclient.h], [
+    have_wasapi="yes"
+  ], [
+    AS_IF([test "x${enable_wasapi}" != "x"], [
+      AC_MSG_ERROR([Windows Audio Session API not found.])
+    ])
+  ])
+])
+AM_CONDITIONAL([HAVE_WASAPI], [test "${have_wasapi}" = "yes"])
+
 dnl
 dnl  win32 waveOut plugin
 dnl

modules/audio_output/Modules.am

@@ -49,7 +49,9 @@ libwasapi_plugin_la_SOURCES = wasapi.c
 libwasapi_plugin_la_CFLAGS = $(AM_CFLAGS)
 libwasapi_plugin_la_LIBADD = $(AM_LIBADD) -lole32 -lksuser
 libwasapi_plugin_la_DEPENDENCIES =
-EXTRA_LTLIBRARIES += libwasapi_plugin.la
+if HAVE_WASAPI
+libvlc_LTLIBRARIES += libwasapi_plugin.la
+endif
 
 libkai_plugin_la_SOURCES = kai.c packet.c
 libkai_plugin_la_CFLAGS = $(AM_CFLAGS)