char sub_mb_P_cabac ( int *dct_allowed, CABACContext *c, unsigned char *state, SLICE *slice, RESIDU *Current_residu,
short mv_cache_l0[][2], short *ref_cache_l0, short mvl0_cache[][2], short *refl0_cache)
{
int mbPartIdx ;
int subMbPartIdx ;
char RefIdxL0[4] = {0, 0, 0, 0};
//Recovery of the sub-macroblock type
for ( mbPartIdx = 0 ; mbPartIdx < 4 ; mbPartIdx++ ) {
Current_residu -> SubMbType [mbPartIdx] = decode_cabac_p_mb_sub_type(c, state);
}
#ifdef ERROR_DETECTION
//Error detection
if(ErrorsCheckSubMbType( Current_residu -> SubMbType, MaxPSubMbType)){
//should be set to zero because the macroblock will be decoded.
refl0_cache [12] = refl0_cache [14] = refl0_cache [28] = refl0_cache [30] = 0;
return 1;
}
#endif
//Recovery of the image reference of each sub-macroblock
if (slice -> num_RefIdxL0_active_minus1 > 0) {
if(GetCabacPSubRefIdx(c, state, RefIdxL0, ref_cache_l0, RefIdxL0, slice -> num_RefIdxL0_active_minus1)){
refl0_cache [12] = refl0_cache [14] = refl0_cache [28] = refl0_cache [30] = 0;
return 1;
}
} else {
ref_cache_l0[12] = ref_cache_l0[14] = ref_cache_l0[28] = ref_cache_l0[30] = 0;
}
//Recovery of the motion vector of each sub-macroblock
for ( mbPartIdx = 0 ; mbPartIdx < 4 ; mbPartIdx++ ) {
short MvdL0[2];
int sub_mb_type = Current_residu -> SubMbType [mbPartIdx];
for ( subMbPartIdx = 0 ; subMbPartIdx < sub_num_p_part[ sub_mb_type] ; subMbPartIdx++ ) {
int index = SCAN8(( mbPartIdx << 2) + (sub_mb_type == 1 ? 2 * subMbPartIdx: subMbPartIdx));
//Decode cabac
ReadCabacSubMotionVector(c, state, mv_cache_l0, MvdL0, mbPartIdx, subMbPartIdx, sub_mb_type, index, slice -> slice_type);
//Compute Mv
refill_ref(2 - (sub_mb_type > 1), 2 - (sub_mb_type & 1), RefIdxL0[mbPartIdx], &refl0_cache[index]);
motion_vector(mvl0_cache, MvdL0, refl0_cache, &mvl0_cache[index][0], RefIdxL0[mbPartIdx], index, 2 / ( 1 + ( sub_mb_type > 1)));
}
refill_motion_vector(0, sub_mb_type, &mvl0_cache[SCAN8(( mbPartIdx << 2))]);
}
for ( mbPartIdx = 0; mbPartIdx < 4 && dct_allowed; mbPartIdx ++){
if ( !(sub_num_p_part[Current_residu -> SubMbType[mbPartIdx]] == 1) ){
*dct_allowed = 0;
}
}
return 0;
}
/**
This function decode the motion vector of a macroblock with 8x8 partition
*/
void ReadCabac8x8MotionVector(CABACContext *c, unsigned char *state, RESIDU *CurrentResidu, SLICE *slice,
short mv_cache_lx[][2], short MvdLx[][2], int Pred_Lx)
{
int mbPartIdx, subMbPartIdx;
for ( mbPartIdx = 0 ; mbPartIdx < 4 ; mbPartIdx++ ) {
int SubMbType = CurrentResidu -> SubMbType [mbPartIdx];
if ( (sub_mb_b_name [SubMbType] != B_direct) && (sub_mb_b_name [SubMbType] != Pred_Lx )) {
for ( subMbPartIdx = 0 ; subMbPartIdx < sub_num_b_part[SubMbType] ; subMbPartIdx++ ) {
int xpart = (SubMbType < 5 || SubMbType == 6 || SubMbType == 8) ? 2:1;
int index = SCAN8(( mbPartIdx << 2) + subMbPartIdx * xpart);
ReadCabacSubMotionVector(c, state, mv_cache_lx, &MvdLx [(mbPartIdx << 2) + subMbPartIdx][0],
mbPartIdx, subMbPartIdx, SubMbType, index, slice -> slice_type);
}
}
}
}
