msdk: Add conditional build for vp9 decoder

https://bugzilla.gnome.org/show_bug.cgi?id=796119

configure.ac

@@ -1139,9 +1139,34 @@ AG_GST_CHECK_FEATURE(MSDK, [Intel MediaSDK], msdk, [
   else
     HAVE_MSDK="no"
   fi
-])
+], [], [
+  dnl check the availability of vp9 apis
+  USE_MSDK_VP9_DEC=0
+  save_CPPFLAGS="$CPPFLAGS"
+  CPPFLAGS="$LIBMFX_CFLAGS $MSDK_CFLAGS $save_CPPFLAGS"
+  AC_CHECK_HEADER(mfxvp9.h, [HAVE_MFXVP9_H=1], [HAVE_MFXVP9_H=0],
+  [
+    #include <mfxplugin.h>
+  ])
+  dnl check the availability of vp9 apis in PREFIX/include/mfx
+  AC_CHECK_HEADER(mfx/mfxvp9.h, [HAVE_MFX_MFXVP9_H=1], [HAVE_MFX_MFXVP9_H=0],
+  [
+    #include <mfx/mfxplugin.h>
+  ])
+  if test $HAVE_MFX_MFXVP9_H -eq 1; then
+    AC_DEFINE(HAVE_MFX_MFXVP9_H, 1, [Define if mfx/mfxdefs.h available])
+  fi
+
+  if test $HAVE_MFXVP9_H -eq 1 \
+    -o $HAVE_MFX_MFXVP9_H -eq 1; then
+      USE_MSDK_VP9_DEC=1
+      AC_DEFINE(USE_MSDK_VP9_DEC, 1, [Define if MediaSDK VP9 decoder api is available])
+  fi
+  ], [USE_MSDK_VP9_DEC=0])
 AM_CONDITIONAL(USE_MSDK_LIBVA,
     test "x$HAVE_MSDK" = "xyes" -a "x$HAVE_LIBVA_DRM" = "xyes")
+AM_CONDITIONAL([USE_MSDK_VP9_DEC],
+    [test $USE_MSDK_VP9_DEC -eq 1])
 
 dnl *** ext plug-ins ***
 dnl keep this list sorted alphabetically !

sys/msdk/Makefile.am

@@ -17,7 +17,6 @@ libgstmsdk_la_SOURCES = \
 	gstmsdkvp8dec.c \
 	gstmsdkvp8enc.c \
 	gstmsdkvc1dec.c \
-	gstmsdkvp9dec.c \
 	gstmsdkdec.c \
 	gstmsdkenc.c \
 	gstmsdkvpp.c \
@@ -48,12 +47,19 @@ noinst_HEADERS = \
 	gstmsdkvp8dec.h \
 	gstmsdkvp8enc.h \
 	gstmsdkvc1dec.h \
-	gstmsdkvp9dec.h \
 	gstmsdkdec.h \
 	gstmsdkenc.h \
 	gstmsdkvpp.h \
 	gstmsdkvpputil.h
 
+# Conditional build for vp9 decoder
+libgstmsdk_vp9dec_source_c = gstmsdkvp9dec.c
+libgstmsdk_vp9dec_source_h = gstmsdkvp9dec.h
+if USE_MSDK_VP9_DEC
+libgstmsdk_la_SOURCES += $(libgstmsdk_vp9dec_source_c)
+noinst_HEADERS += $(libgstmsdk_vp9dec_source_h)
+endif
+
 libgstmsdk_la_CFLAGS = \
 	$(GST_CFLAGS) \
 	$(GST_BASE_CFLAGS) \

sys/msdk/gstmsdk.c

@@ -47,7 +47,9 @@
 #include "gstmsdkvp8dec.h"
 #include "gstmsdkvp8enc.h"
 #include "gstmsdkvc1dec.h"
+#ifdef USE_MSDK_VP9_DEC
 #include "gstmsdkvp9dec.h"
+#endif
 #include "gstmsdkvpp.h"
 
 GST_DEBUG_CATEGORY (gst_msdk_debug);
@@ -132,9 +134,10 @@ plugin_init (GstPlugin * plugin)
 
   ret = gst_element_register (plugin, "msdkvc1dec", GST_RANK_NONE,
       GST_TYPE_MSDKVC1DEC);
-
+#ifdef USE_MSDK_VP9_DEC
   ret = gst_element_register (plugin, "msdkvp9dec", GST_RANK_NONE,
       GST_TYPE_MSDKVP9DEC);
+#endif
 
   ret = gst_element_register (plugin, "msdkvpp", GST_RANK_NONE,
       GST_TYPE_MSDKVPP);

sys/msdk/gstmsdkvp9dec.c

@@ -35,7 +35,7 @@
 #  include <config.h>
 #endif
 
-#ifdef HAVE_LIBMFX
+#ifdef HAVE_MFX_MFXVP9_H
 #  include <mfx/mfxplugin.h>
 #  include <mfx/mfxvp9.h>
 #else