H.264 SVC Complexity Reduction Based on Likelihood Mode Decision

Pseudocode 1

If (MB_encoded == I_frame of Base Layer)

 Calculate RDC of all modes;

 Prime Mode = RDC_min of all modes;

 Check for next MB;

 elseif (MB_encoded == P/B_frame of Base Layer)

  Calculate RDC of BL_PRED, SKIP, 16 × 16, 16 × 8, 8 × 16, 8 × 8;

  Prime Mode = RDC_min of BL_PRED, SKIP, 16 × 16, 16 × 8, 8 × 16, 8 × 8;

  Check for next MB;

 elseif (MB_encoded == I_frame of Enhancement Layer)

  Build a desired set of intermodes using (3) in highest degree of likeliness

  & add other intermodes not in to the desired set;

  If (Mode_current == inter mode)

   if (Mode_first == SKIP∥INTER 16 × 16)

    Prime Mode = _max of DIRECT 8 × 8, INTER 8 × 8;

    Check for next MB;

   elseif (Mode_first == INTER 16 × 8)

    Prime Mode = _max of DIRECT 8 × 8, INTER 8 × 8, INTER 8 × 4;

    Check for next MB;

   elseif (Mode_first == INTER 8 × 16)

    Prime Mode = _max of DIRECT 8 × 8, INTER 8 × 8, INTER 4 × 8;

    Check for next MB;

   else

    Prime Mode = _max of all sub blocks;

    Check for next MB;

  else

    Calculate RDC of all intramodes of current MB;

    Prime Mode = RDC_min of all intramodes of current MB;

    Check for next MB;

else

 Calculate RDC of top, left, top right mode of current MB;

 Prime Mode = RDC_min of top, left, top right;

 Check for next MB;