sub_mb_pred( mb_type ) {
for( mbPartIdx = 0; mbPartIdx < 4; mbPartIdx++ )
// sub_mb_type[ mbPartIdx ] 指明子宏块的预测类型，在不同的宏块类型中这个句法元素的语义不一样。
sub_mb_type[ mbPartIdx ]
for( mbPartIdx = 0; mbPartIdx < 4; mbPartIdx++ )
if( ( num_ref_idx_l0_active_minus1 > 0 | |
mb_field_decoding_flag ) &&
mb_type != P_8x8ref0 &&
sub_mb_type[ mbPartIdx ] != B_Direct_8x8 &&
SubMbPredMode( sub_mb_type[ mbPartIdx ] ) != Pred_L1 )
ref_idx_l0[ mbPartIdx ]
for( mbPartIdx = 0; mbPartIdx < 4; mbPartIdx++ )
if( (num_ref_idx_l1_active_minus1 > 0 | | mb_field_decoding_flag )
&&
sub_mb_type[ mbPartIdx ] != B_Direct_8x8 &&
SubMbPredMode( sub_mb_type[ mbPartIdx ] ) != Pred_L0 )
ref_idx_l1[ mbPartIdx ]
for( mbPartIdx = 0; mbPartIdx < 4; mbPartIdx++ )
if( sub_mb_type[ mbPartIdx ] != B_Direct_8x8 &&
SubMbPredMode( sub_mb_type[ mbPartIdx ] ) != Pred_L1 )
for( subMbPartIdx = 0;
subMbPartIdx < NumSubMbPart( sub_mb_type[ mbPartIdx ] );
subMbPartIdx++)
for( compIdx = 0; compIdx < 2; compIdx++ )
mvd_l0[ mbPartIdx ][ subMbPartIdx ][ compIdx ]
for( mbPartIdx = 0; mbPartIdx < 4; mbPartIdx++ )
if( sub_mb_type[ mbPartIdx ] != B_Direct_8x8 &&
SubMbPredMode( sub_mb_type[ mbPartIdx ] ) != Pred_L0 )
for( subMbPartIdx = 0;
subMbPartIdx < NumSubMbPart( sub_mb_type[ mbPartIdx ] );
subMbPartIdx++)
for( compIdx = 0; compIdx < 2; compIdx++ )
mvd_l1[ mbPartIdx ][ subMbPartIdx ][ compIdx ]
}