Evaluate sum of squares, 16X16 block

Supported Technologies



FwStatus   fwiSqrDiff16x16_8u32s ( const Fw8u * pSrcFw32s srcStepconst Fw8u * pRefFw32s refStepFw32s mcTypeFw32s * pSqrDiff );


mcType   Specifies the type of prediction used for motion compensation.
pRef   Pointer to a prefetch buffer which contains previously decoded bits.
pSqrDiff   Pointer to a sum of square differences between the current and reference blocks.
pSrc   Pointer to a block of DCT coefficients.
refStep   Reference block step size (width of the block in bytes).
srcStep   Source buffer step size (width of the buffer in bytes).


This function evaluates the sum of squares variance between all the elements of a 16X16 source block and the corresponding elements of a 16X16 reference block. Integer results are written to a location specified by pSqrDiff.

A compensation type for the reference block is specified by the mcType parameter.

When mcType = FWVC_MC_APX_FF, each element of the reference block is used.

When mcType = FWVC_MC_APX_FH or FWVC_MC_APX_HF, the average of two reference block elements is used.

When mcType = FWVC_MC_APX_HH, the average of four reference block elements is used.