* Improve validation of input parameters & error reporting

src/va.h

@@ -86,17 +86,19 @@ typedef void* VADisplay;	/* window system dependent */
 typedef int VAStatus;	/* Return status type from functions */
 /* Values for the return status */
 #define VA_STATUS_SUCCESS			0x00000000
-#define VA_STATUS_ERROR_ALLOCATION_FAILED	0x00000001
-#define VA_STATUS_ERROR_INVALID_CONFIG		0x00000002
-#define VA_STATUS_ERROR_INVALID_CONTEXT		0x00000003
-#define VA_STATUS_ERROR_INVALID_SURFACE		0x00000004
-#define VA_STATUS_ERROR_INVALID_BUFFER		0x00000005
-#define VA_STATUS_ERROR_ATTR_NOT_SUPPORTED	0x00000006
-#define VA_STATUS_ERROR_MAX_NUM_EXCEEDED	0x00000007
-#define VA_STATUS_ERROR_UNSUPPORTED_PROFILE		0x00000008
-#define VA_STATUS_ERROR_UNSUPPORTED_ENTRYPOINT	0x00000009
-#define VA_STATUS_ERROR_UNSUPPORTED_RT_FORMAT	0x0000000a
-#define VA_STATUS_ERROR_UNSUPPORTED_BUFFERTYPE	0x0000000b
+#define VA_STATUS_ERROR_OPERATION_FAILED	0x00000001
+#define VA_STATUS_ERROR_ALLOCATION_FAILED	0x00000002
+#define VA_STATUS_ERROR_INVALID_DISPLAY		0x00000003
+#define VA_STATUS_ERROR_INVALID_CONFIG		0x00000004
+#define VA_STATUS_ERROR_INVALID_CONTEXT		0x00000005
+#define VA_STATUS_ERROR_INVALID_SURFACE		0x00000006
+#define VA_STATUS_ERROR_INVALID_BUFFER		0x00000007
+#define VA_STATUS_ERROR_ATTR_NOT_SUPPORTED	0x00000008
+#define VA_STATUS_ERROR_MAX_NUM_EXCEEDED	0x00000009
+#define VA_STATUS_ERROR_UNSUPPORTED_PROFILE	0x0000000a
+#define VA_STATUS_ERROR_UNSUPPORTED_ENTRYPOINT	0x0000000b
+#define VA_STATUS_ERROR_UNSUPPORTED_RT_FORMAT	0x0000000c
+#define VA_STATUS_ERROR_UNSUPPORTED_BUFFERTYPE	0x0000000d
 #define VA_STATUS_ERROR_UNKNOWN			0xFFFFFFFF
 
 /*

src/va_backend.h

@@ -51,7 +51,7 @@ struct VADriverContext
     int max_display_attributes;
     void *handle;			/* dlopen handle */
     void *pDriverData;
-    struct
+    struct VADriverVTable
     {
 	 VAStatus (*vaTerminate) ( VADriverContextP ctx );