va: Add VAConfigAttribEncMaxTileRows and VAConfigAttribEncMaxTileCols

Currently there is no way of exposing the driver tile_rows and tile_cols limitations
for encoding with tiles. For codecs like AV1 there is a cap specifying the max number
of tiles, but without differentiating cols/rows.

Different hardware may have restrictions which may need to be taken into account.
More specifically, D3D12 encode exposes the maximum rows/cols and adding
VAConfigAttribEncMaxTileRows/Cols allows for mapping that information to the VAOn12 driver.

Signed-off-by: Sil Vilerino <sivileri@microsoft.com>

Author: sivileri

va/va.h

@@ -1036,6 +1036,20 @@ typedef enum {
      * The value returned uses the VAConfigAttribValEncPerBlockControl type.
      */
     VAConfigAttribEncPerBlockControl    = 55,
+    /**
+     * \brief Maximum number of tile rows. Read-only.
+     *
+     * This attribute determines the maximum number of tile
+     * rows supported for encoding with tile support.
+     */
+    VAConfigAttribEncMaxTileRows        = 56,
+    /**
+     * \brief Maximum number of tile cols. Read-only.
+     *
+     * This attribute determines the maximum number of tile
+     * columns supported for encoding with tile support.
+     */
+    VAConfigAttribEncMaxTileCols        = 57,
     /**@}*/
     VAConfigAttribTypeMax
 } VAConfigAttribType;

va/va_str.c

@@ -149,6 +149,8 @@ const char *vaConfigAttribTypeStr(VAConfigAttribType configAttribType)
         TOSTR(VAConfigAttribEncAV1Ext1);
         TOSTR(VAConfigAttribEncAV1Ext2);
         TOSTR(VAConfigAttribEncPerBlockControl);
+        TOSTR(VAConfigAttribEncMaxTileRows);
+        TOSTR(VAConfigAttribEncMaxTileCols);
     case VAConfigAttribTypeMax:
         break;
     }