VaapiVEA: Get maximum resolution from libva

third_party/libva/va/va_backend.h

 /*
  * Copyright (c) 2007 Intel Corporation. All Rights Reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the
  * "Software"), to deal in the Software without restriction, including
  * without limitation the rights to use, copy, modify, merge, publish,
  * distribute, sub license, and/or sell copies of the Software, and to
  * permit persons to whom the Software is furnished to do so, subject to
  * the following conditions:
@@ skipping 374 matching lines @@
                 void **buffer /* if it is not NULL, map the surface buffer for
                                 * CPU access
                                 */
         );
     
         VAStatus (*vaUnlockSurface) (
                 VADriverContextP ctx,
                 VASurfaceID surface
         );
 
+        VAStatus (*vaGetCodecResolution) (

[wuchengli, 2015/01/23 12:58:21]

We should call this vaGetProfileResolution. Functions of va.h uses profile. For
example, vaQueryConfigProfiles, VAProfile, and etc. 

This function doesn't have VAProfile or other argument. What's the prerequisite
of calling this function? How does the caller know if the returned resolution is
for H264 or VP8? For decode or encode? Should we pass VAProfile, VAEntrypoint,
and VAConfigAttrib to this function?

+                VADriverContextP ctx,
+                unsigned int *width,    /* out */
+                unsigned int *height    /* out */
+        );
+
         /* DEPRECATED */
         VAStatus
         (*vaGetSurfaceAttributes)(
             VADriverContextP    dpy,
             VAConfigID          config,
             VASurfaceAttrib    *attrib_list,
             unsigned int        num_attribs
         );
 
         VAStatus
@@ skipping 131 matching lines @@
     void *opaque; /* opaque for display extensions (e.g. GLX) */
     void *vatrace; /* opaque for VA trace context */
     void *vafool; /* opaque for VA fool context */
 };
 
 typedef VAStatus (*VADriverInit) (
     VADriverContextP driver_context
 );
 
 #endif /* _VA_BACKEND_H_ */