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// AVC Child Kernel (Vertical and horizontal de-block a 4:2:0 MB Y comp)

// First, de-block vertical edges from left to right.

// Second, de-block horizontal edge from top to bottom.

//

//      ***** MBAFF Mode *****

//      This version deblocks top MB first, followed by bottom MB.

//      Need variable CurMB     to indicate top MB or bottom MB (CurMB = 0 or 1).  

//      We can use BotFieldFlag in BitFields to represent it.

//  Usage:

//      1) Access control data for top

//              CntrlDataOffsetY + CurMB  * Control data block size             (64 DWs for CL, 16 DWs for BLC)

//      2) Load frame/field video data based on flags: FieldModeCurrentMbFlag, FieldModeLeftMbFlag, FieldModeaboveMbFlag,

//      E.g.

//      if (pCntlData->BitField & FieldModeCurrentMbFlag)

//              cur_y = ORIX_CUR.y + CurMB * 1;                         // Add field vertical offset for bot field MB .

//      else

//              cur_y = ORIX_CUR.y + CurMB * MB_Rows_Y;         // Add bottom MB vertical offset for bot MB

#define AVC_ILDB

 

.kernel AVC_ILDB_CHILD_MBAFF_Y

#if defined(COMBINED_KERNEL)

ILDB_LABEL(AVC_ILDB_CHILD_Y):

#endif

 

#include "SetupVPKernel.asm"

#include "AVC_ILDB.inc"

 

#if defined(_DEBUG)

        mov             (1)             EntrySignatureC:w                       0xE998:w

#endif

 

        // Setup temp buf used by load and save code

        #define BUF_B           RTempB                         

        #define BUF_D           RTempD

       

        // Init local variables

        // These coordinates are in progressive fashion

        mul (4)         ORIX_CUR<2>:w           ORIX<0;1,0>:w           16:w    { NoDDClr }             // Expand X addr to bytes, repeat 4 times

        mul (4)         ORIY_CUR<2>:w           ORIY<0;1,0>:w           32:w    { NoDDChk }             // Expand Y addr to bytes, repeat 4 times

 

        mov (2)         f0.0<1>:w               0:w

       

        mov     (1)             GateWayOffsetC:uw       ORIY:uw                                         // Use row # as Gateway offset

 

        //=== Null Kernel ===============================================================

//      jmpi POST_ILDB

        //===============================================================================

 

        //====================================================================================

        // Assuming the MB control data is laid out in scan line order in a rectangle with width = 16 bytes.

        // Control data has dimension of X x Y = 16 x N bytes, where N = W x H / 16

        // Each MB has 256 bytes of control data

 

        // For CRESTLINE, 256 bytes are stored in memory and fetched into GRF.

        // MB_offset = MBsCntX * CurRow + CurCol

        // Byte_offset = MB_offset * (256 << Mbaff_flag),       Mbaff_flag = 0 or 1.

        // Base address of a control data block = (x, y) = (0, y'=y/x), region width is 16 bytes

        // where y' = Byte_offset / 16 = MB_offset * (16 << Mbaff_flag)

        // MBCntrlDataOffsetY holds y'.