/*!
************************************************************************
* \brief
* read the first part of the header (only the pic_parameter_set_id)
* \return
* Length of the first part of the slice header (in bits)
************************************************************************
*/
int FirstPartOfSliceHeader(Slice *currSlice)
{
VideoParameters *p_Vid = currSlice->p_Vid;
byte dP_nr = assignSE2partition[currSlice->dp_mode][SE_HEADER];
DataPartition *partition = &(currSlice->partArr[dP_nr]);
Bitstream *currStream = partition->bitstream;
int tmp;
p_Dec->UsedBits= partition->bitstream->frame_bitoffset; // was hardcoded to 31 for previous start-code. This is better.
// Get first_mb_in_slice
currSlice->start_mb_nr = read_ue_v ("SH: first_mb_in_slice", currStream, &p_Dec->UsedBits);
tmp = read_ue_v ("SH: slice_type", currStream, &p_Dec->UsedBits);
if (tmp > 4) tmp -= 5;
p_Vid->type = currSlice->slice_type = (SliceType) tmp;
currSlice->pic_parameter_set_id = read_ue_v ("SH: pic_parameter_set_id", currStream, &p_Dec->UsedBits);
if( p_Vid->separate_colour_plane_flag )
currSlice->colour_plane_id = read_u_v (2, "SH: colour_plane_id", currStream, &p_Dec->UsedBits);
else
currSlice->colour_plane_id = PLANE_Y;
return p_Dec->UsedBits;
}
void nal_unit_header_mvc_extension(NALUnitHeaderMVCExt_t *NaluHeaderMVCExt, Bitstream *s)
{
//to be implemented;
NaluHeaderMVCExt->non_idr_flag = read_u_v (1, "non_idr_flag", s, &p_Dec->UsedBits);
NaluHeaderMVCExt->priority_id = read_u_v (6, "priority_id", s, &p_Dec->UsedBits);
NaluHeaderMVCExt->view_id = read_u_v (10, "view_id", s, &p_Dec->UsedBits);
NaluHeaderMVCExt->temporal_id = read_u_v (3, "temporal_id", s, &p_Dec->UsedBits);
NaluHeaderMVCExt->anchor_pic_flag = read_u_v (1, "anchor_pic_flag", s, &p_Dec->UsedBits);
NaluHeaderMVCExt->inter_view_flag = read_u_v (1, "inter_view_flag", s, &p_Dec->UsedBits);
NaluHeaderMVCExt->reserved_one_bit = read_u_v (1, "reserved_one_bit", s, &p_Dec->UsedBits);
if(NaluHeaderMVCExt->reserved_one_bit != 1)
{
printf("Nalu Header MVC Extension: reserved_one_bit is not 1!\n");
}
}
int read_u_1 (char *tracestring, Bitstream *bitstream, int *used_bits)
{
return (int) read_u_v (1, tracestring, bitstream, used_bits);
}
/*!
************************************************************************
* \brief
* read the scond part of the header (without the pic_parameter_set_id
* \return
* Length of the second part of the Slice header in bits
************************************************************************
*/
int RestOfSliceHeader(Slice *currSlice)
{
VideoParameters *p_Vid = currSlice->p_Vid;
InputParameters *p_Inp = currSlice->p_Inp;
seq_parameter_set_rbsp_t *active_sps = p_Vid->active_sps;
byte dP_nr = assignSE2partition[currSlice->dp_mode][SE_HEADER];
DataPartition *partition = &(currSlice->partArr[dP_nr]);
Bitstream *currStream = partition->bitstream;
int val, len;
currSlice->frame_num = read_u_v (active_sps->log2_max_frame_num_minus4 + 4, "SH: frame_num", currStream, &p_Dec->UsedBits);
/* Tian Dong: frame_num gap processing, if found */
if(currSlice->idr_flag) //if (p_Vid->idr_flag)
{
p_Vid->pre_frame_num = currSlice->frame_num;
// picture error concealment
p_Vid->last_ref_pic_poc = 0;
assert(currSlice->frame_num == 0);
}
if (active_sps->frame_mbs_only_flag)
{
p_Vid->structure = FRAME;
currSlice->field_pic_flag=0;
}
else
{
// field_pic_flag u(1)
currSlice->field_pic_flag = read_u_1("SH: field_pic_flag", currStream, &p_Dec->UsedBits);
if (currSlice->field_pic_flag)
{
// bottom_field_flag u(1)
currSlice->bottom_field_flag = (byte) read_u_1("SH: bottom_field_flag", currStream, &p_Dec->UsedBits);
p_Vid->structure = currSlice->bottom_field_flag ? BOTTOM_FIELD : TOP_FIELD;
}
else
{
p_Vid->structure = FRAME;
currSlice->bottom_field_flag = FALSE;
}
}
currSlice->structure = (PictureStructure) p_Vid->structure;
//currSlice->mb_aff_frame_flag = (active_sps->mb_adaptive_frame_field_flag && (currSlice->field_pic_flag==0));
//currSlice->mb_aff_frame_flag = p_Vid->mb_aff_frame_flag;
if ((active_sps->mb_adaptive_frame_field_flag && (currSlice->field_pic_flag==0)))
error("this version only support progressive video streams.\n", -1);
if (p_Vid->structure == FRAME )
assert (currSlice->field_pic_flag == 0);
if (p_Vid->structure == TOP_FIELD )
assert (currSlice->field_pic_flag == 1 && (currSlice->bottom_field_flag == FALSE));
if (p_Vid->structure == BOTTOM_FIELD)
assert (currSlice->field_pic_flag == 1 && (currSlice->bottom_field_flag == TRUE ));
if (currSlice->idr_flag)
{
currSlice->idr_pic_id = read_ue_v("SH: idr_pic_id", currStream, &p_Dec->UsedBits);
}
#if (MVC_EXTENSION_ENABLE)
else if ( currSlice->svc_extension_flag == 0 && currSlice->NaluHeaderMVCExt.non_idr_flag == 0 )
{
currSlice->idr_pic_id = read_ue_v("SH: idr_pic_id", currStream, &p_Dec->UsedBits);
}
#endif
if (active_sps->pic_order_cnt_type == 0)
{
currSlice->pic_order_cnt_lsb = read_u_v(active_sps->log2_max_pic_order_cnt_lsb_minus4 + 4, "SH: pic_order_cnt_lsb", currStream, &p_Dec->UsedBits);
if( p_Vid->active_pps->bottom_field_pic_order_in_frame_present_flag == 1 && !currSlice->field_pic_flag )
currSlice->delta_pic_order_cnt_bottom = read_se_v("SH: delta_pic_order_cnt_bottom", currStream, &p_Dec->UsedBits);
else
currSlice->delta_pic_order_cnt_bottom = 0;
}
if( active_sps->pic_order_cnt_type == 1 )
{
if ( !active_sps->delta_pic_order_always_zero_flag )
{
currSlice->delta_pic_order_cnt[ 0 ] = read_se_v("SH: delta_pic_order_cnt[0]", currStream, &p_Dec->UsedBits);
if( p_Vid->active_pps->bottom_field_pic_order_in_frame_present_flag == 1 && !currSlice->field_pic_flag )
currSlice->delta_pic_order_cnt[ 1 ] = read_se_v("SH: delta_pic_order_cnt[1]", currStream, &p_Dec->UsedBits);
else
currSlice->delta_pic_order_cnt[ 1 ] = 0; // set to zero if not in stream
}
else
{
currSlice->delta_pic_order_cnt[ 0 ] = 0;
currSlice->delta_pic_order_cnt[ 1 ] = 0;
}
}
//! redundant_pic_cnt is missing here
if (p_Vid->active_pps->redundant_pic_cnt_present_flag)
{
currSlice->redundant_pic_cnt = read_ue_v ("SH: redundant_pic_cnt", currStream, &p_Dec->UsedBits);
}
if(currSlice->slice_type == B_SLICE)
{
currSlice->direct_spatial_mv_pred_flag = read_u_1 ("SH: direct_spatial_mv_pred_flag", currStream, &p_Dec->UsedBits);
}
currSlice->num_ref_idx_active[LIST_0] = p_Vid->active_pps->num_ref_idx_l0_default_active_minus1 + 1;
currSlice->num_ref_idx_active[LIST_1] = p_Vid->active_pps->num_ref_idx_l1_default_active_minus1 + 1;
if(currSlice->slice_type == P_SLICE || currSlice->slice_type == SP_SLICE || currSlice->slice_type == B_SLICE)
{
val = read_u_1 ("SH: num_ref_idx_override_flag", currStream, &p_Dec->UsedBits);
if (val)
{
currSlice->num_ref_idx_active[LIST_0] = 1 + read_ue_v ("SH: num_ref_idx_l0_active_minus1", currStream, &p_Dec->UsedBits);
if(currSlice->slice_type == B_SLICE)
{
currSlice->num_ref_idx_active[LIST_1] = 1 + read_ue_v ("SH: num_ref_idx_l1_active_minus1", currStream, &p_Dec->UsedBits);
}
}
}
if (currSlice->slice_type!=B_SLICE)
{
currSlice->num_ref_idx_active[LIST_1] = 0;
}
#if (MVC_EXTENSION_ENABLE)
if (currSlice->svc_extension_flag == 0 || currSlice->svc_extension_flag == 1)
ref_pic_list_mvc_modification(currSlice);
else
ref_pic_list_reordering(currSlice);
#else
ref_pic_list_reordering(currSlice);
#endif
currSlice->weighted_pred_flag = (unsigned short) ((currSlice->slice_type == P_SLICE || currSlice->slice_type == SP_SLICE)
? p_Vid->active_pps->weighted_pred_flag
: (currSlice->slice_type == B_SLICE && p_Vid->active_pps->weighted_bipred_idc == 1));
currSlice->weighted_bipred_idc = (unsigned short) (currSlice->slice_type == B_SLICE && p_Vid->active_pps->weighted_bipred_idc > 0);
if ((p_Vid->active_pps->weighted_pred_flag&&(currSlice->slice_type == P_SLICE|| currSlice->slice_type == SP_SLICE))||
(p_Vid->active_pps->weighted_bipred_idc==1 && (currSlice->slice_type == B_SLICE)))
{
pred_weight_table(currSlice);
}
if (currSlice->nal_reference_idc)
dec_ref_pic_marking(p_Vid, currStream, currSlice);
if (p_Vid->active_pps->entropy_coding_mode_flag && currSlice->slice_type != I_SLICE && currSlice->slice_type != SI_SLICE)
{
currSlice->model_number = read_ue_v("SH: cabac_init_idc", currStream, &p_Dec->UsedBits);
}
else
{
currSlice->model_number = 0;
}
currSlice->slice_qp_delta = val = read_se_v("SH: slice_qp_delta", currStream, &p_Dec->UsedBits);
//currSlice->qp = p_Vid->qp = 26 + p_Vid->active_pps->pic_init_qp_minus26 + val;
currSlice->qp = 26 + p_Vid->active_pps->pic_init_qp_minus26 + val;
if ((currSlice->qp < -p_Vid->bitdepth_luma_qp_scale) || (currSlice->qp > 51))
error ("slice_qp_delta makes slice_qp_y out of range", 500);
if(currSlice->slice_type == SP_SLICE || currSlice->slice_type == SI_SLICE)
{
if(currSlice->slice_type==SP_SLICE)
{
currSlice->sp_switch = read_u_1 ("SH: sp_for_switch_flag", currStream, &p_Dec->UsedBits);
}
currSlice->slice_qs_delta = val = read_se_v("SH: slice_qs_delta", currStream, &p_Dec->UsedBits);
currSlice->qs = 26 + p_Vid->active_pps->pic_init_qs_minus26 + val;
if ((currSlice->qs < 0) || (currSlice->qs > 51))
error ("slice_qs_delta makes slice_qs_y out of range", 500);
}
if ( !HI_intra_only_profile(active_sps->profile_idc, active_sps->constrained_set3_flag) || (p_Inp->intra_profile_deblocking == 1) )
//then read flags and parameters from bistream
{
#if DPF_PARAM_DISP
printf("deblocking_filter_control_present_flag:%d\n", p_Vid->active_pps->deblocking_filter_control_present_flag);
#endif
if (p_Vid->active_pps->deblocking_filter_control_present_flag)
{
currSlice->DFDisableIdc = (short) read_ue_v ("SH: disable_deblocking_filter_idc", currStream, &p_Dec->UsedBits);
if (currSlice->DFDisableIdc!=1)
{
currSlice->DFAlphaC0Offset = (short) (2 * read_se_v("SH: slice_alpha_c0_offset_div2", currStream, &p_Dec->UsedBits));
currSlice->DFBetaOffset = (short) (2 * read_se_v("SH: slice_beta_offset_div2", currStream, &p_Dec->UsedBits));
}
else
{
currSlice->DFAlphaC0Offset = currSlice->DFBetaOffset = 0;
}
}
else
{
currSlice->DFDisableIdc = currSlice->DFAlphaC0Offset = currSlice->DFBetaOffset = 0;
}
#if DPF_PARAM_DISP
printf("Slice:%d, DFParameters:(%d,%d,%d)\n\n", currSlice->current_slice_nr, currSlice->DFDisableIdc, currSlice->DFAlphaC0Offset, currSlice->DFBetaOffset);
#endif
}
else //By default the Loop Filter is Off
{ //444_TEMP_NOTE: change made below. 08/07/07
//still need to parse the SEs (read flags and parameters from bistream) but will ignore
if (p_Vid->active_pps->deblocking_filter_control_present_flag)
{
currSlice->DFDisableIdc = (short) read_ue_v ("SH: disable_deblocking_filter_idc", currStream, &p_Dec->UsedBits);
if (currSlice->DFDisableIdc!=1)
{
currSlice->DFAlphaC0Offset = (short) (2 * read_se_v("SH: slice_alpha_c0_offset_div2", currStream, &p_Dec->UsedBits));
currSlice->DFBetaOffset = (short) (2 * read_se_v("SH: slice_beta_offset_div2", currStream, &p_Dec->UsedBits));
}
}//444_TEMP_NOTE. the end of change. 08/07/07
//Ignore the SEs, by default the Loop Filter is Off
currSlice->DFDisableIdc =1;
currSlice->DFAlphaC0Offset = currSlice->DFBetaOffset = 0;
}
if (p_Vid->active_pps->num_slice_groups_minus1>0 && p_Vid->active_pps->slice_group_map_type>=3 &&
p_Vid->active_pps->slice_group_map_type<=5)
{
len = (active_sps->pic_height_in_map_units_minus1+1)*(active_sps->pic_width_in_mbs_minus1+1)/
(p_Vid->active_pps->slice_group_change_rate_minus1+1);
if (((active_sps->pic_height_in_map_units_minus1+1)*(active_sps->pic_width_in_mbs_minus1+1))%
(p_Vid->active_pps->slice_group_change_rate_minus1+1))
len +=1;
len = CeilLog2(len+1);
currSlice->slice_group_change_cycle = read_u_v (len, "SH: slice_group_change_cycle", currStream, &p_Dec->UsedBits);
}
p_Vid->PicHeightInMbs = p_Vid->FrameHeightInMbs / ( 1 + currSlice->field_pic_flag );
p_Vid->PicSizeInMbs = p_Vid->PicWidthInMbs * p_Vid->PicHeightInMbs;
p_Vid->FrameSizeInMbs = p_Vid->PicWidthInMbs * p_Vid->FrameHeightInMbs;
return p_Dec->UsedBits;
}
