/******************************************************************************

 *

 * Copyright (C) 2022 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at:

 *

 * http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 *

 *****************************************************************************

 * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore

 */

/**

 *******************************************************************************

 * @file

 *  isvcd_parse_headers.c

 *

 * @brief

 *  Contains High level syntax[above slice] parsing routines

 *

 * @author

 *  Kishore

 *

 * @par List of Functions:

 *  - isvcd_set_default_seq_svc_ext()

 *  - isvcd_parse_subset_sps()

 *  - isvcd_dec_ref_base_pic_marking()

 *  - isvcd_parse_nal_unit()

 *  - isvcd_parse_sps()

 *  - isvcd_parse_pps()

 *

 * @remarks

 *  None

 *

 *******************************************************************************

 */

#include <string.h>

#include <assert.h>

#include "ih264_typedefs.h"

#include "ih264_defs.h"

#include "ih264_macros.h"

#include "ih264_platform_macros.h"

#include "ih264d_bitstrm.h"

#include "isvcd_structs.h"

#include "ih264d_parse_cavlc.h"

#include "ih264d_defs.h"

#include "ih264d_parse_slice.h"

#include "ih264d_tables.h"

#include "ih264d_utils.h"

#include "ih264d_nal.h"

#include "ih264d_deblocking.h"

#include "ih264d_mem_request.h"

#include "ih264d_debug.h"

#include "ih264_debug.h"

#include "ih264d_error_handler.h"

#include "ih264d_mb_utils.h"

#include "ih264d_sei.h"

#include "ih264d_vui.h"

#include "ih264d_thread_parse_decode.h"

#include "ih264d_thread_compute_bs.h"

#include "ih264d_quant_scaling.h"

#include "ih264d_defs.h"

#include "ivd.h"

#include "ih264d_parse_islice.h"

#include "isvcd_parse_slice.h"

#include "ih264d_process_bslice.h"

#include "ih264d_process_pslice.h"

#include "isvcd_vui.h"

WORD32 ih264d_access_unit_delimiter_rbsp(dec_struct_t *ps_dec);

void ih264d_get_pre_sei_params(dec_struct_t *ps_dec, UWORD8 u1_nal_unit_type);

UWORD32 ih264d_correct_level_idc(UWORD32 u4_level_idc, UWORD32 u4_total_mbs);

WORD32 ih264d_parse_filler_data(dec_struct_t *ps_dec, dec_bit_stream_t *ps_bitstrm);

void ih264d_parse_end_of_stream(dec_struct_t *ps_dec);

WORD32 ih264d_parse_slice_partition(dec_struct_t *ps_dec, dec_bit_stream_t *ps_bitstrm);

/*!

**************************************************************************

* \if Function name : isvcd_set_default_seq_svc_ext \en

dif

*

* \brief

*    Sets the default values for the svc params in the SVC bitstream

*

* \return

**************************************************************************

*/

void isvcd_set_default_seq_svc_ext(dec_subset_seq_params_t *ps_seq_svc_ext)

{

    ps_seq_svc_ext->u1_inter_layer_deblocking_filter_control_present_flag = 0;

    ps_seq_svc_ext->u1_extended_spatial_scalability_idc = 0;

    ps_seq_svc_ext->u1_chroma_phase_x_plus1_flag = 1;

    ps_seq_svc_ext->u1_chroma_phase_y_plus1 = 1;

    ps_seq_svc_ext->u1_seq_ref_layer_chroma_phase_x_plus1_flag =

        ps_seq_svc_ext->u1_chroma_phase_x_plus1_flag;

    ps_seq_svc_ext->u1_seq_ref_layer_chroma_phase_y_plus1 = ps_seq_svc_ext->u1_chroma_phase_y_plus1;

    ps_seq_svc_ext->i4_seq_scaled_ref_layer_left_offset = 0;

    ps_seq_svc_ext->i4_seq_scaled_ref_layer_top_offset = 0;

    ps_seq_svc_ext->i4_seq_scaled_ref_layer_right_offset = 0;

    ps_seq_svc_ext->i4_seq_scaled_ref_layer_bottom_offset = 0;

    ps_seq_svc_ext->u1_seq_tcoeff_level_prediction_flag =

        ps_seq_svc_ext->u1_adaptive_tcoeff_level_prediction_flag = 0;

    ps_seq_svc_ext->u1_slice_header_restriction_flag = 0;

    ps_seq_svc_ext->u1_svc_vui_parameters_present_flag = 0;

}

/*!

**************************************************************************

* \if Function name : isvcd_parse_subset_sps \en

dif

*

* \brief

*    Decodes Sequence parameter set from the SVC bitstream

*

* \return

*    0 on Success and Error code otherwise

**************************************************************************

*/

WORD32 isvcd_parse_subset_sps(svc_dec_lyr_struct_t *ps_svc_lyr_dec, dec_bit_stream_t *ps_bitstrm)

{

    dec_struct_t *ps_dec = &ps_svc_lyr_dec->s_dec;

    UWORD8 i;

    dec_seq_params_t *ps_seq = NULL;

    dec_svc_seq_params_t *ps_subset_seq = NULL;

    dec_subset_seq_params_t *ps_seq_svc_ext;

    UWORD8 u1_profile_idc, u1_level_idc, u1_seq_parameter_set_id, u1_mb_aff_flag = 0;

    UWORD16 i2_max_frm_num;

    UWORD32 *pu4_bitstrm_buf = ps_bitstrm->pu4_buffer;

    UWORD32 *pu4_bitstrm_ofst = &ps_bitstrm->u4_ofst;

    UWORD8 u1_frm, uc_constraint_set0_flag, uc_constraint_set1_flag, uc_constraint_set2_flag;

    WORD32 i4_cropped_ht, i4_cropped_wd;

    UWORD32 u4_temp;

    UWORD64 u8_temp;

    UWORD32 u4_pic_height_in_map_units, u4_pic_width_in_mbs;

    UWORD32 u2_pic_wd = 0;

    UWORD32 u2_pic_ht = 0;

    UWORD32 u2_frm_wd_y = 0;

    UWORD32 u2_frm_ht_y = 0;

    UWORD32 u2_frm_wd_uv = 0;

    UWORD32 u2_frm_ht_uv = 0;

    UWORD32 u2_crop_offset_y = 0;

    UWORD32 u2_crop_offset_uv = 0;

    WORD32 ret;

    /* High profile related syntax element */

    WORD32 i4_i;

    /* G050 */

    UWORD8 u1_frame_cropping_flag,

        u1_frame_cropping_rect_left_ofst = 0, u1_frame_cropping_rect_right_ofst = 0,

        u1_frame_cropping_rect_top_ofst = 0, u1_frame_cropping_rect_bottom_ofst = 0;

    /* G050 */

    /*--------------------------------------------------------------------*/

    /* Decode seq_parameter_set_id and profile and level values           */

    /*--------------------------------------------------------------------*/

    SWITCHONTRACE;

    u1_profile_idc = ih264d_get_bits_h264(ps_bitstrm, 8);

    COPYTHECONTEXT("SPS: profile_idc", u1_profile_idc);

    /* G050 */

    uc_constraint_set0_flag = ih264d_get_bit_h264(ps_bitstrm);

    uc_constraint_set1_flag = ih264d_get_bit_h264(ps_bitstrm);

    uc_constraint_set2_flag = ih264d_get_bit_h264(ps_bitstrm);

    UNUSED(uc_constraint_set1_flag);

    UNUSED(uc_constraint_set2_flag);

    /*****************************************************/

    /* Read 5 bits for uc_constraint_set3_flag (1 bit)   */

    /* and reserved_zero_4bits (4 bits) - Sushant        */

    /*****************************************************/

    ih264d_get_bits_h264(ps_bitstrm, 5);

    /* G050 */

    u1_level_idc = (UWORD8) ih264d_get_bits_h264(ps_bitstrm, 8);

    COPYTHECONTEXT("SPS: u4_level_idc", u1_level_idc);

    u4_temp = ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf);

    if(u4_temp & MASK_ERR_SEQ_SET_ID) return ERROR_INV_SPS_PPS_T;

    u1_seq_parameter_set_id = u4_temp;

    COPYTHECONTEXT("SPS: seq_parameter_set_id", u1_seq_parameter_set_id);

    if(u1_seq_parameter_set_id >= MAX_NUM_SEQ_PARAMS) return ERROR_INV_SPS_PPS_T;

    /*--------------------------------------------------------------------*/

    /* Find an seq param entry in seqparam array of decStruct             */

    /*--------------------------------------------------------------------*/

    ps_subset_seq = ps_svc_lyr_dec->pv_scratch_subset_sps;

    memset(ps_subset_seq, 0, sizeof(dec_svc_seq_params_t));

    ps_seq = ps_dec->pv_scratch_sps_pps;

    memset(ps_seq, 0, sizeof(dec_seq_params_t));

    ps_seq->u1_profile_idc = u1_profile_idc;

    ps_seq->u1_level_idc = u1_level_idc;

    ps_seq->u1_seq_parameter_set_id = u1_seq_parameter_set_id;

    /* subset_seq_sps_will be stored from location 32 : MAX_NUM_SEQ_PARAMS*/

    u1_seq_parameter_set_id += MAX_NUM_SEQ_PARAMS;

    ps_subset_seq->ps_seq = &ps_dec->ps_sps[u1_seq_parameter_set_id];

    if((ps_dec->i4_header_decoded & 1) &&

       (1 == ps_dec->ps_sps[u1_seq_parameter_set_id].u1_is_valid) &&

       (ps_dec->ps_sps[u1_seq_parameter_set_id].u1_profile_idc != u1_profile_idc))

    {

        ps_dec->u1_res_changed = 1;

        return IVD_RES_CHANGED;

    }

    if((ps_dec->i4_header_decoded & 1) &&

       (1 == ps_dec->ps_sps[u1_seq_parameter_set_id].u1_is_valid) &&

       (ps_dec->ps_sps[u1_seq_parameter_set_id].u1_level_idc != u1_level_idc))

    {

        ps_dec->u1_res_changed = 1;

        return IVD_RES_CHANGED;

    }

    /*******************************************************************/

    /* Initializations for high profile - Sushant                      */

    /*******************************************************************/

    ps_seq->i4_chroma_format_idc = 1;

    ps_seq->i4_bit_depth_luma_minus8 = 0;

    ps_seq->i4_bit_depth_chroma_minus8 = 0;

    ps_seq->i4_qpprime_y_zero_transform_bypass_flag = 0;

    ps_seq->i4_seq_scaling_matrix_present_flag = 0;

    if(u1_profile_idc == HIGH_PROFILE_IDC || u1_profile_idc == SCALABLE_BASELINE_PROFILE_IDC ||

       u1_profile_idc == SCALABLE_HIGH_PROFILE_IDC)

    {

        /* reading chroma_format_idc   */

        ps_seq->i4_chroma_format_idc = ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf);

        /* Monochrome is not supported */

        if(ps_seq->i4_chroma_format_idc != 1)

        {

            return ERROR_FEATURE_UNAVAIL;

        }

        /* reading bit_depth_luma_minus8   */

        ps_seq->i4_bit_depth_luma_minus8 = ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf);

        if(ps_seq->i4_bit_depth_luma_minus8 != 0)

        {

            return ERROR_FEATURE_UNAVAIL;

        }

        /* reading bit_depth_chroma_minus8   */

        ps_seq->i4_bit_depth_chroma_minus8 = ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf);

        if(ps_seq->i4_bit_depth_chroma_minus8 != 0)

        {

            return ERROR_FEATURE_UNAVAIL;

        }

        /* reading qpprime_y_zero_transform_bypass_flag   */

        ps_seq->i4_qpprime_y_zero_transform_bypass_flag = (WORD32) ih264d_get_bit_h264(ps_bitstrm);

        if(ps_seq->i4_qpprime_y_zero_transform_bypass_flag != 0)

        {

            return ERROR_INV_SPS_PPS_T;

        }

        /* reading seq_scaling_matrix_present_flag   */

        ps_seq->i4_seq_scaling_matrix_present_flag = (WORD32) ih264d_get_bit_h264(ps_bitstrm);

        if(ps_seq->i4_seq_scaling_matrix_present_flag)

        {

            for(i4_i = 0; i4_i < 8; i4_i++)

            {

                ps_seq->u1_seq_scaling_list_present_flag[i4_i] = ih264d_get_bit_h264(ps_bitstrm);

                /* initialize u1_use_default_scaling_matrix_flag[i4_i] to zero */

                /* before calling scaling list                             */

                ps_seq->u1_use_default_scaling_matrix_flag[i4_i] = 0;

                if(ps_seq->u1_seq_scaling_list_present_flag[i4_i])

                {

                    if(i4_i < 6)

                    {

                        ret = ih264d_scaling_list(ps_seq->i2_scalinglist4x4[i4_i], 16,

                                                  &ps_seq->u1_use_default_scaling_matrix_flag[i4_i],

                                                  ps_bitstrm);

                    }

                    else

                    {

                        ret = ih264d_scaling_list(ps_seq->i2_scalinglist8x8[i4_i - 6], 64,

                                                  &ps_seq->u1_use_default_scaling_matrix_flag[i4_i],

                                                  ps_bitstrm);

                    }

                    if(ret != OK)

                    {

                        return ret;

                    }

                }

            }

        }

    }

    /*--------------------------------------------------------------------*/

    /* Decode MaxFrameNum                                                 */

    /*--------------------------------------------------------------------*/

    u8_temp = (UWORD64) 4 + ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf);

    if(u8_temp > MAX_BITS_IN_FRAME_NUM)

    {

        return ERROR_INV_SPS_PPS_T;

    }

    ps_seq->u1_bits_in_frm_num = (UWORD8) u8_temp;

    COPYTHECONTEXT("SPS: log2_max_frame_num_minus4", (ps_seq->u1_bits_in_frm_num - 4));

    i2_max_frm_num = (1 << (ps_seq->u1_bits_in_frm_num));

    ps_seq->u2_u4_max_pic_num_minus1 = i2_max_frm_num - 1;

    /*--------------------------------------------------------------------*/

    /* Decode picture order count and related values                      */

    /*--------------------------------------------------------------------*/

    u4_temp = ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf);

    if(u4_temp > MAX_PIC_ORDER_CNT_TYPE)

    {

        return ERROR_INV_POC_TYPE_T;

    }

    ps_seq->u1_pic_order_cnt_type = u4_temp;

    COPYTHECONTEXT("SPS: pic_order_cnt_type", ps_seq->u1_pic_order_cnt_type);

    ps_seq->u1_num_ref_frames_in_pic_order_cnt_cycle = 1;

    if(ps_seq->u1_pic_order_cnt_type == 0)

    {

        u8_temp = (UWORD64) 4 + ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf);

        if(u8_temp > MAX_BITS_IN_POC_LSB)

        {

            return ERROR_INV_SPS_PPS_T;

        }

        ps_seq->u1_log2_max_pic_order_cnt_lsb_minus = (UWORD8) u8_temp;

        ps_seq->i4_max_pic_order_cntLsb = (1 << u8_temp);

        COPYTHECONTEXT("SPS: log2_max_pic_order_cnt_lsb_minus4", (u8_temp - 4));

    }

    else if(ps_seq->u1_pic_order_cnt_type == 1)

    {

        ps_seq->u1_delta_pic_order_always_zero_flag = ih264d_get_bit_h264(ps_bitstrm);

        COPYTHECONTEXT("SPS: delta_pic_order_always_zero_flag",

                       ps_seq->u1_delta_pic_order_always_zero_flag);

        ps_seq->i4_ofst_for_non_ref_pic = ih264d_sev(pu4_bitstrm_ofst, pu4_bitstrm_buf);

        COPYTHECONTEXT("SPS: offset_for_non_ref_pic", ps_seq->i4_ofst_for_non_ref_pic);

        ps_seq->i4_ofst_for_top_to_bottom_field = ih264d_sev(pu4_bitstrm_ofst, pu4_bitstrm_buf);

        COPYTHECONTEXT("SPS: offset_for_top_to_bottom_field",

                       ps_seq->i4_ofst_for_top_to_bottom_field);

        u4_temp = ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf);

        if(u4_temp > 255) return ERROR_INV_SPS_PPS_T;

        ps_seq->u1_num_ref_frames_in_pic_order_cnt_cycle = u4_temp;

        COPYTHECONTEXT("SPS: num_ref_frames_in_pic_order_cnt_cycle",

                       ps_seq->u1_num_ref_frames_in_pic_order_cnt_cycle);

        for(i = 0; i < ps_seq->u1_num_ref_frames_in_pic_order_cnt_cycle; i++)

        {

            ps_seq->i4_ofst_for_ref_frame[i] = ih264d_sev(pu4_bitstrm_ofst, pu4_bitstrm_buf);

            COPYTHECONTEXT("SPS: offset_for_ref_frame", ps_seq->i4_ofst_for_ref_frame[i]);

        }

    }

    u4_temp = ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf);

    if((u4_temp > H264_MAX_REF_PICS))

    {

        return ERROR_NUM_REF;

    }

    /* Compare with older num_ref_frames is header is already once */

    if((ps_dec->i4_header_decoded & 1) &&

       (1 == ps_dec->ps_sps[u1_seq_parameter_set_id].u1_is_valid) &&

       (ps_dec->ps_sps[u1_seq_parameter_set_id].u1_num_ref_frames != u4_temp))

    {

        ps_dec->u1_res_changed = 1;

        return IVD_RES_CHANGED;

    }

    ps_seq->u1_num_ref_frames = u4_temp;

    COPYTHECONTEXT("SPS: num_ref_frames", ps_seq->u1_num_ref_frames);

    ps_seq->u1_gaps_in_frame_num_value_allowed_flag = ih264d_get_bit_h264(ps_bitstrm);

    COPYTHECONTEXT("SPS: gaps_in_frame_num_value_allowed_flag",

                   ps_seq->u1_gaps_in_frame_num_value_allowed_flag);

    /* SVC_DEC_REVIEW */

    ps_seq->u1_gaps_in_frame_num_value_allowed_flag = 0;

    /*--------------------------------------------------------------------*/

    /* Decode FrameWidth and FrameHeight and related values               */

    /*--------------------------------------------------------------------*/

    u8_temp = (UWORD64) 1 + ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf);

    /* Check  for unsupported resolutions*/

    if(u8_temp > (H264_MAX_FRAME_WIDTH >> 4))

    {

        return IVD_STREAM_WIDTH_HEIGHT_NOT_SUPPORTED;

    }

    u4_pic_width_in_mbs = (UWORD32) u8_temp;

    COPYTHECONTEXT("SPS: pic_width_in_mbs_minus1", u4_pic_width_in_mbs - 1);

    u8_temp = (UWORD64) 1 + ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf);

    if(u8_temp > (H264_MAX_FRAME_HEIGHT >> 4))

    {

        return IVD_STREAM_WIDTH_HEIGHT_NOT_SUPPORTED;

    }

    u4_pic_height_in_map_units = (UWORD32) u8_temp;

    ps_seq->u2_frm_wd_in_mbs = u4_pic_width_in_mbs;

    ps_seq->u2_frm_ht_in_mbs = u4_pic_height_in_map_units;

    u2_pic_wd = (u4_pic_width_in_mbs << 4);

    u2_pic_ht = (u4_pic_height_in_map_units << 4);

    if(ps_svc_lyr_dec->pic_width < u2_pic_wd)

    {

        ps_svc_lyr_dec->pic_width = u2_pic_wd;

    }

    if(ps_svc_lyr_dec->pic_height < u2_pic_ht)

    {

        ps_svc_lyr_dec->pic_height = u2_pic_ht;

    }

    /*--------------------------------------------------------------------*/

    /* Get the value of MaxMbAddress and Number of bits needed for it     */

    /*--------------------------------------------------------------------*/

    ps_seq->u4_max_mb_addr = (ps_seq->u2_frm_wd_in_mbs * ps_seq->u2_frm_ht_in_mbs) - 1;

    ps_seq->u4_total_num_of_mbs = ps_seq->u4_max_mb_addr + 1;

    ps_seq->u1_level_idc = ih264d_correct_level_idc(u1_level_idc, ps_seq->u4_total_num_of_mbs);

    u1_frm = ih264d_get_bit_h264(ps_bitstrm);

    if((ps_dec->i4_header_decoded & 1) &&

       (1 == ps_dec->ps_sps[u1_seq_parameter_set_id].u1_is_valid) &&

       (ps_dec->ps_sps[u1_seq_parameter_set_id].u1_frame_mbs_only_flag != u1_frm))

    {

        ps_dec->u1_res_changed = 1;

        return IVD_RES_CHANGED;

    }

    ps_seq->u1_frame_mbs_only_flag = u1_frm;

    COPYTHECONTEXT("SPS: frame_mbs_only_flag", u1_frm);

    if(!u1_frm) u1_mb_aff_flag = ih264d_get_bit_h264(ps_bitstrm);

    if((ps_dec->i4_header_decoded & 1) &&

       (1 == ps_dec->ps_sps[u1_seq_parameter_set_id].u1_is_valid) &&

       (ps_dec->ps_sps[u1_seq_parameter_set_id].u1_mb_aff_flag != u1_mb_aff_flag))

    {

        ps_dec->u1_res_changed = 1;

        return IVD_RES_CHANGED;

    }

    if(!u1_frm)

    {

        u2_pic_ht <<= 1;

        ps_seq->u1_mb_aff_flag = u1_mb_aff_flag;

        COPYTHECONTEXT("SPS: mb_adaptive_frame_field_flag", ps_seq->u1_mb_aff_flag);

    }

    else

        ps_seq->u1_mb_aff_flag = 0;

    ps_seq->u1_direct_8x8_inference_flag = ih264d_get_bit_h264(ps_bitstrm);

    COPYTHECONTEXT("SPS: direct_8x8_inference_flag", ps_seq->u1_direct_8x8_inference_flag);

    /* G050 */

    u1_frame_cropping_flag = ih264d_get_bit_h264(ps_bitstrm);

    COPYTHECONTEXT("SPS: frame_cropping_flag", u1_frame_cropping_flag);

    if(u1_frame_cropping_flag)

    {

        u1_frame_cropping_rect_left_ofst = ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf);

        COPYTHECONTEXT("SPS: frame_cropping_rect_left_offset", u1_frame_cropping_rect_left_ofst);

        u1_frame_cropping_rect_right_ofst = ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf);

        COPYTHECONTEXT("SPS: frame_cropping_rect_right_offset", u1_frame_cropping_rect_right_ofst);

        u1_frame_cropping_rect_top_ofst = ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf);

        COPYTHECONTEXT("SPS: frame_cropping_rect_top_offset", u1_frame_cropping_rect_top_ofst);

        u1_frame_cropping_rect_bottom_ofst = ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf);

        COPYTHECONTEXT("SPS: frame_cropping_rect_bottom_offset",

                       u1_frame_cropping_rect_bottom_ofst);

    }

    /* G050 */

    ps_seq->u1_vui_parameters_present_flag = ih264d_get_bit_h264(ps_bitstrm);

    COPYTHECONTEXT("SPS: vui_parameters_present_flag", ps_seq->u1_vui_parameters_present_flag);

    u2_frm_wd_y = u2_pic_wd + (UWORD8) (PAD_LEN_Y_H << 1);

    if(1 == ps_dec->u4_share_disp_buf)

    {

        if(ps_dec->u4_app_disp_width > u2_frm_wd_y) u2_frm_wd_y = ps_dec->u4_app_disp_width;

    }

    u2_frm_ht_y = u2_pic_ht + (UWORD8) (PAD_LEN_Y_V << 2);

    u2_frm_wd_uv = u2_pic_wd + (UWORD8) (PAD_LEN_UV_H << 2);

    u2_frm_wd_uv = MAX(u2_frm_wd_uv, u2_frm_wd_y);

    u2_frm_ht_uv = (u2_pic_ht >> 1) + (UWORD8) (PAD_LEN_UV_V << 2);

    u2_frm_ht_uv = MAX(u2_frm_ht_uv, (u2_frm_ht_y >> 1));

    /* Calculate display picture width, height and start u4_ofst from YUV420 */

    /* pictute buffers as per cropping information parsed above             */

    {

        UWORD16 u2_rgt_ofst = 0;

        UWORD16 u2_lft_ofst = 0;

        UWORD16 u2_top_ofst = 0;

        UWORD16 u2_btm_ofst = 0;

        UWORD8 u1_frm_mbs_flag;

        UWORD8 u1_vert_mult_factor;

        if(u1_frame_cropping_flag)

        {

            /* Calculate right and left u4_ofst for cropped picture           */

            u2_rgt_ofst = u1_frame_cropping_rect_right_ofst << 1;

            u2_lft_ofst = u1_frame_cropping_rect_left_ofst << 1;

            /* Know frame MBs only u4_flag                                      */

            u1_frm_mbs_flag = (1 == ps_seq->u1_frame_mbs_only_flag);

            /* Simplify the vertical u4_ofst calculation from field/frame     */

            u1_vert_mult_factor = (2 - u1_frm_mbs_flag);

            /* Calculate bottom and top u4_ofst for cropped  picture          */

            u2_btm_ofst = (u1_frame_cropping_rect_bottom_ofst << u1_vert_mult_factor);

            u2_top_ofst = (u1_frame_cropping_rect_top_ofst << u1_vert_mult_factor);

        }

        /* Calculate u4_ofst from start of YUV 420 picture buffer to start of*/

        /* cropped picture buffer                                           */

        u2_crop_offset_y = (u2_frm_wd_y * u2_top_ofst) + (u2_lft_ofst);

        u2_crop_offset_uv =

            (u2_frm_wd_uv * (u2_top_ofst >> 1)) + (u2_lft_ofst >> 1) * YUV420SP_FACTOR;

        /* Calculate the display picture width and height based on crop      */

        /* information                                                       */

        i4_cropped_ht = (WORD32) u2_pic_ht - (WORD32) (u2_btm_ofst + u2_top_ofst);

        i4_cropped_wd = (WORD32) u2_pic_wd - (WORD32) (u2_rgt_ofst + u2_lft_ofst);

        if((i4_cropped_ht < MB_SIZE) || (i4_cropped_wd < MB_SIZE))

        {

            return ERROR_INV_SPS_PPS_T;

        }

        if((ps_dec->i4_header_decoded & 1) &&

           (1 == ps_dec->ps_sps[u1_seq_parameter_set_id].u1_is_valid) &&

           (ps_svc_lyr_dec->ps_subset_sps[u1_seq_parameter_set_id].u2_pic_wd != u2_pic_wd))

        {

            ps_dec->u1_res_changed = 1;

            return IVD_RES_CHANGED;

        }

        if((ps_dec->i4_header_decoded & 1) &&

           (1 == ps_dec->ps_sps[u1_seq_parameter_set_id].u1_is_valid) &&

           (ps_svc_lyr_dec->ps_subset_sps[u1_seq_parameter_set_id].u2_disp_width != i4_cropped_wd))

        {

            ps_dec->u1_res_changed = 1;

            return IVD_RES_CHANGED;

        }

        if((ps_dec->i4_header_decoded & 1) &&

           (1 == ps_dec->ps_sps[u1_seq_parameter_set_id].u1_is_valid) &&

           (ps_svc_lyr_dec->ps_subset_sps[u1_seq_parameter_set_id].u2_pic_ht != u2_pic_ht))

        {

            ps_dec->u1_res_changed = 1;

            return IVD_RES_CHANGED;

        }

        if((ps_dec->i4_header_decoded & 1) &&

           (1 == ps_dec->ps_sps[u1_seq_parameter_set_id].u1_is_valid) &&

           (ps_svc_lyr_dec->ps_subset_sps[u1_seq_parameter_set_id].u2_disp_height != i4_cropped_ht))

        {

            ps_dec->u1_res_changed = 1;

            return IVD_RES_CHANGED;

        }

        /* Check again for unsupported resolutions with updated values*/

        if((u2_pic_wd > SVCD_MAX_FRAME_WIDTH) || (u2_pic_ht > SVCD_MAX_FRAME_HEIGHT) ||

           (u2_pic_wd < SVCD_MIN_FRAME_WIDTH) || (u2_pic_ht < SVCD_MIN_FRAME_HEIGHT) ||

           (u2_pic_wd * (UWORD32) u2_pic_ht > SVCD_MAX_FRAME_SIZE))

        {

            return IVD_STREAM_WIDTH_HEIGHT_NOT_SUPPORTED;

        }

        /* If MBAff is enabled, decoder support is limited to streams with

         * width less than half of H264_MAX_FRAME_WIDTH.

         * In case of MBAff decoder processes two rows at a time

         */

        if((u2_pic_wd << ps_seq->u1_mb_aff_flag) > H264_MAX_FRAME_WIDTH)

        {

            return IVD_STREAM_WIDTH_HEIGHT_NOT_SUPPORTED;

        }

    }

    if(1 == ps_seq->u1_vui_parameters_present_flag)

    {

        ret = ih264d_parse_vui_parametres(&ps_seq->s_vui, ps_bitstrm);

        if(ret != OK) return ret;

    }

    ps_seq_svc_ext = &ps_subset_seq->s_sps_svc_ext;

    isvcd_set_default_seq_svc_ext(ps_seq_svc_ext);

    if(SCALABLE_BASELINE_PROFILE_IDC == ps_seq->u1_profile_idc ||

       SCALABLE_HIGH_PROFILE_IDC == ps_seq->u1_profile_idc)

    {

        SWITCHONTRACE;

        ps_seq_svc_ext->u1_inter_layer_deblocking_filter_control_present_flag =

            ih264d_get_bit_h264(ps_bitstrm);

        COPYTHECONTEXT("SPS_EXt: u1_inter_layer_deblocking_filter_control_present_flag",

                       ps_seq_svc_ext->u1_inter_layer_deblocking_filter_control_present_flag);

        ps_seq_svc_ext->u1_extended_spatial_scalability_idc = ih264d_get_bits_h264(ps_bitstrm, 2);

        COPYTHECONTEXT("SPS_EXt: u1_extended_spatial_scalability_idc",

                       ps_seq_svc_ext->u1_extended_spatial_scalability_idc);

        /* u1_extended_spatial_scalability_idc value 0, 1 and 2 are supported */

        if(ps_seq_svc_ext->u1_extended_spatial_scalability_idc > 2)

        {

            return ERROR_SVC_INV_SUBSET_SPS;

        }

        /* ChromaArrayType = i4_chroma_format_idc  if  separate_colour_plane_flag =

         * 0 for all chroma format except 4:4:4 */

        if(1 == ps_seq->i4_chroma_format_idc || 2 == ps_seq->i4_chroma_format_idc)

        {

            ps_seq_svc_ext->u1_chroma_phase_x_plus1_flag = ih264d_get_bit_h264(ps_bitstrm);

            COPYTHECONTEXT("SPS_EXt: u1_chroma_phase_x_plus1_flag",

                           ps_seq_svc_ext->u1_chroma_phase_x_plus1_flag);

        }

        if(1 == ps_seq->i4_chroma_format_idc)

        {

            ps_seq_svc_ext->u1_chroma_phase_y_plus1 = ih264d_get_bits_h264(ps_bitstrm, 2);

            COPYTHECONTEXT("SPS_EXt: u1_chroma_phase_y_plus1",

                           ps_seq_svc_ext->u1_chroma_phase_y_plus1);

            if(ps_seq_svc_ext->u1_chroma_phase_y_plus1 >= 3)

            {

                return ERROR_SVC_INV_SUBSET_SPS;

            }

        }

        /* inferred values not covered in isvcd_set_default_seq_svc_ext*/

        ps_seq_svc_ext->u1_seq_ref_layer_chroma_phase_x_plus1_flag =

            ps_seq_svc_ext->u1_chroma_phase_x_plus1_flag;

        ps_seq_svc_ext->u1_seq_ref_layer_chroma_phase_y_plus1 =

            ps_seq_svc_ext->u1_chroma_phase_y_plus1;

        if(1 == ps_seq_svc_ext->u1_extended_spatial_scalability_idc)

        {

            if(ps_seq->i4_chroma_format_idc > 0)

            {

                ps_seq_svc_ext->u1_seq_ref_layer_chroma_phase_x_plus1_flag =

                    ih264d_get_bit_h264(ps_bitstrm);

                COPYTHECONTEXT("SPS_EXt: u1_seq_ref_layer_chroma_phase_x_plus1_flag",

                               ps_seq_svc_ext->u1_seq_ref_layer_chroma_phase_x_plus1_flag);

                ps_seq_svc_ext->u1_seq_ref_layer_chroma_phase_y_plus1 =

                    ih264d_get_bits_h264(ps_bitstrm, 2);

                COPYTHECONTEXT("SPS_EXt: u1_seq_ref_layer_chroma_phase_y_plus1",

                               ps_seq_svc_ext->u1_seq_ref_layer_chroma_phase_y_plus1);

                if(ps_seq_svc_ext->u1_seq_ref_layer_chroma_phase_y_plus1 >= 3)

                {

                    return ERROR_SVC_INV_SUBSET_SPS;

                }

            }

            ps_seq_svc_ext->i4_seq_scaled_ref_layer_left_offset =

                ih264d_sev(pu4_bitstrm_ofst, pu4_bitstrm_buf);

            COPYTHECONTEXT("SPS_EXt: i4_seq_scaled_ref_layer_left_offset",

                           ps_seq_svc_ext->i4_seq_scaled_ref_layer_left_offset);

            if(ps_seq_svc_ext->i4_seq_scaled_ref_layer_left_offset != 0)

            {

                return ERROR_SVC_INV_SUBSET_SPS;

            }

            if(ps_seq_svc_ext->i4_seq_scaled_ref_layer_left_offset >= MAX_SCLD_REF_LAYER_OFFSET ||

               ps_seq_svc_ext->i4_seq_scaled_ref_layer_left_offset < MIN_SCLD_REF_LAYER_OFFSET)

            {

                return ERROR_SVC_INV_SUBSET_SPS;

            }

            ps_seq_svc_ext->i4_seq_scaled_ref_layer_top_offset =

                ih264d_sev(pu4_bitstrm_ofst, pu4_bitstrm_buf);

            COPYTHECONTEXT("SPS_EXt: i4_seq_scaled_ref_layer_top_offset",

                           ps_seq_svc_ext->i4_seq_scaled_ref_layer_top_offset);

            if(ps_seq_svc_ext->i4_seq_scaled_ref_layer_top_offset != 0)

            {

                return ERROR_SVC_INV_SUBSET_SPS;

            }

            if(ps_seq_svc_ext->i4_seq_scaled_ref_layer_top_offset >= MAX_SCLD_REF_LAYER_OFFSET ||

               ps_seq_svc_ext->i4_seq_scaled_ref_layer_top_offset < MIN_SCLD_REF_LAYER_OFFSET)

            {

                return ERROR_SVC_INV_SUBSET_SPS;

            }

            ps_seq_svc_ext->i4_seq_scaled_ref_layer_right_offset =

                ih264d_sev(pu4_bitstrm_ofst, pu4_bitstrm_buf);

            COPYTHECONTEXT("SPS_EXt: i4_seq_scaled_ref_layer_right_offset",

                           ps_seq_svc_ext->i4_seq_scaled_ref_layer_right_offset);

            if(ps_seq_svc_ext->i4_seq_scaled_ref_layer_right_offset >= MAX_SCLD_REF_LAYER_OFFSET ||

               ps_seq_svc_ext->i4_seq_scaled_ref_layer_right_offset < MIN_SCLD_REF_LAYER_OFFSET)

            {

                return ERROR_SVC_INV_SUBSET_SPS;

            }

            ps_seq_svc_ext->i4_seq_scaled_ref_layer_bottom_offset =

                ih264d_sev(pu4_bitstrm_ofst, pu4_bitstrm_buf);

            COPYTHECONTEXT("SPS_EXt: i4_seq_scaled_ref_layer_bottom_offset",

                           ps_seq_svc_ext->i4_seq_scaled_ref_layer_bottom_offset);

            if(ps_seq_svc_ext->i4_seq_scaled_ref_layer_bottom_offset >= MAX_SCLD_REF_LAYER_OFFSET ||

               ps_seq_svc_ext->i4_seq_scaled_ref_layer_bottom_offset < MIN_SCLD_REF_LAYER_OFFSET)

            {

                return ERROR_INV_SLICE_HDR_T;

            }

        }

        ps_seq_svc_ext->u1_seq_tcoeff_level_prediction_flag = ih264d_get_bit_h264(ps_bitstrm);

        COPYTHECONTEXT("SPS_EXt: u1_seq_tcoeff_level_prediction_flag",

                       ps_seq_svc_ext->u1_seq_tcoeff_level_prediction_flag);

        if(1 == ps_seq_svc_ext->u1_seq_tcoeff_level_prediction_flag)

        {

            ps_seq_svc_ext->u1_adaptive_tcoeff_level_prediction_flag =

                ih264d_get_bit_h264(ps_bitstrm);

            COPYTHECONTEXT("SPS_EXt: u1_adaptive_tcoeff_level_prediction_flag",

                           ps_seq_svc_ext->u1_adaptive_tcoeff_level_prediction_flag);

        }

        ps_seq_svc_ext->u1_slice_header_restriction_flag = ih264d_get_bit_h264(ps_bitstrm);

        COPYTHECONTEXT("SPS_EXt: u1_slice_header_restriction_flag",

                       ps_seq_svc_ext->u1_slice_header_restriction_flag);

        ps_seq_svc_ext->u1_svc_vui_parameters_present_flag = ih264d_get_bit_h264(ps_bitstrm);

        COPYTHECONTEXT("SPS_EXt: u1_svc_vui_parameters_present_flag",

                       ps_seq_svc_ext->u1_svc_vui_parameters_present_flag);

        if(1 == ps_seq_svc_ext->u1_svc_vui_parameters_present_flag)

        {

            if(NULL ==

               ps_svc_lyr_dec->ps_subset_sps[u1_seq_parameter_set_id].s_sps_svc_ext.ps_svc_vui_ext)

            {

                void *pv_buf;

                UWORD32 size;

                /* Memory allocation only if VUI is enabled in a particular subset SPS*/

                size = sizeof(svc_vui_ext_t);

                pv_buf = ps_dec->pf_aligned_alloc(ps_dec->pv_mem_ctxt, 128, size);

                RETURN_IF((NULL == pv_buf), IV_FAIL);

                memset(pv_buf, 0, size);

                ps_seq_svc_ext->ps_svc_vui_ext = pv_buf;

                ps_svc_lyr_dec->ps_subset_sps[u1_seq_parameter_set_id]

                    .s_sps_svc_ext.ps_svc_vui_ext = pv_buf;

            }

            else

            {

                ps_seq_svc_ext->ps_svc_vui_ext =

                    ps_svc_lyr_dec->ps_subset_sps[u1_seq_parameter_set_id]

                        .s_sps_svc_ext.ps_svc_vui_ext;

            }

            ret = isvcd_parse_vui_ext_parametres(ps_seq_svc_ext->ps_svc_vui_ext, ps_bitstrm);

            if(ret != OK) return ret;

        }

    }

    /* Add conditions for SCALABLE BASELINE PROFILE */

    if(SCALABLE_BASELINE_PROFILE_IDC == ps_seq->u1_profile_idc ||

       ((SCALABLE_HIGH_PROFILE_IDC == ps_seq->u1_profile_idc) && (1 == uc_constraint_set0_flag)))

    {

        if(ps_seq->i4_chroma_format_idc != 1)

        {

            return ERROR_FEATURE_UNAVAIL;

        }

        if(ps_seq->i4_bit_depth_luma_minus8 != 0)

        {

            return ERROR_FEATURE_UNAVAIL;

        }

        if(ps_seq->i4_bit_depth_chroma_minus8 != 0)

        {

            return ERROR_FEATURE_UNAVAIL;

        }

        if(ps_seq->i4_qpprime_y_zero_transform_bypass_flag != 0)

        {

            return ERROR_FEATURE_UNAVAIL;

        }

        if(ps_seq->u1_frame_mbs_only_flag != 1)

        {

            return ERROR_FEATURE_UNAVAIL;

        }

        if((0 != ps_seq_svc_ext->i4_seq_scaled_ref_layer_left_offset % 16) &&

           (0 != ps_seq_svc_ext->i4_seq_scaled_ref_layer_top_offset % 16))

        {

            return ERROR_FEATURE_UNAVAIL;

        }

    }

    /* Compare older num_reorder_frames with the new one if header is already

     * decoded */

    if((ps_dec->i4_header_decoded & 1) &&

       (1 == ps_dec->ps_sps[u1_seq_parameter_set_id].u1_is_valid) &&

       (1 == ps_dec->ps_sps[u1_seq_parameter_set_id].u1_vui_parameters_present_flag) &&

       (1 == ps_dec->ps_sps[u1_seq_parameter_set_id].s_vui.u1_bitstream_restriction_flag))

    {

        ps_dec->u1_res_changed = 1;

        return IVD_RES_CHANGED;

    }

    /* In case bitstream read has exceeded the filled size, then return an error */

    if(EXCEED_OFFSET(ps_bitstrm))

    {

        return ERROR_INV_SPS_PPS_T;

    }

    /*--------------------------------------------------------------------*/

    /* All initializations to ps_dec are beyond this point                */

    /*--------------------------------------------------------------------*/

    {

        WORD32 reorder_depth = ih264d_get_dpb_size(ps_seq);

        if((1 == ps_seq->u1_vui_parameters_present_flag) &&

           (1 == ps_seq->s_vui.u1_bitstream_restriction_flag))

        {

            reorder_depth = ps_seq->s_vui.u4_num_reorder_frames + 1;

        }

        if(reorder_depth > H264_MAX_REF_PICS)

        {

            return ERROR_INV_SPS_PPS_T;

        }

        if(ps_seq->u1_frame_mbs_only_flag != 1) reorder_depth *= 2;

        ps_subset_seq->i4_reorder_depth = reorder_depth + DISPLAY_LATENCY;

    }

    ps_subset_seq->u2_disp_height = i4_cropped_ht;

    ps_subset_seq->u2_disp_width = i4_cropped_wd;

    ps_subset_seq->u2_pic_wd = u2_pic_wd;

    ps_subset_seq->u2_pic_ht = u2_pic_ht;

    /* Assuming 8k is the maximum resolution svc dec supports*/

    if(u2_frm_wd_y > H264_MAX_FRAME_WIDTH) return (NOT_OK);

    if(u2_frm_ht_y > H264_MAX_FRAME_HEIGHT) return (NOT_OK);

    if(u2_frm_wd_uv > H264_MAX_FRAME_WIDTH) return (NOT_OK);

    if(u2_frm_ht_uv > H264_MAX_FRAME_HEIGHT) return (NOT_OK);

    /* Determining the Width and Height of Frame from that of Picture */

    ps_subset_seq->u2_frm_wd_y = u2_frm_wd_y;

    ps_subset_seq->u2_frm_ht_y = u2_frm_ht_y;

    ps_subset_seq->u2_frm_wd_uv = u2_frm_wd_uv;

    ps_subset_seq->u2_frm_ht_uv = u2_frm_ht_uv;

    ps_subset_seq->u1_pad_len_y_v = (UWORD8) (PAD_LEN_Y_V << (1 - u1_frm));

    ps_subset_seq->u1_pad_len_cr_v = (UWORD8) (PAD_LEN_UV_V << (1 - u1_frm));

    ps_subset_seq->u2_crop_offset_y = u2_crop_offset_y;

    ps_subset_seq->u2_crop_offset_uv = u2_crop_offset_uv;

    ps_seq->u1_is_valid = TRUE;

    ps_dec->ps_sps[u1_seq_parameter_set_id] = *ps_seq;

    if(NULL != ps_svc_lyr_dec->ps_subset_sps[u1_seq_parameter_set_id].s_sps_svc_ext.ps_svc_vui_ext)

    {

        ps_seq_svc_ext->ps_svc_vui_ext =

            ps_svc_lyr_dec->ps_subset_sps[u1_seq_parameter_set_id].s_sps_svc_ext.ps_svc_vui_ext;

    }

    ps_svc_lyr_dec->ps_subset_sps[u1_seq_parameter_set_id] = *ps_subset_seq;

    ps_svc_lyr_dec->ps_cur_subset_sps = &ps_svc_lyr_dec->ps_subset_sps[u1_seq_parameter_set_id];

    return OK;

}

/*!

 **************************************************************************

 * \if Function name : isvcd_dec_ref_base_pic_marking \endif

 *

 * \brief

 *    Decodes reference base pic marking params

 *

 * \return

 *    0 on Success and error code otherwise

 **************************************************************************

 */

WORD32 isvcd_dec_ref_base_pic_marking(

    dec_ref_base_pic_marking_params_t *ps_ref_base_pic_marking_svc_ext,

    dec_bit_stream_t *ps_bitstrm)

{

    UWORD32 *pu4_bitstrm_buf = ps_bitstrm->pu4_buffer;

    UWORD32 *pu4_bitstrm_ofst = &ps_bitstrm->u4_ofst;

    SWITCHONTRACE;

    ps_ref_base_pic_marking_svc_ext->u1_adaptive_ref_base_pic_marking_mode_flag =

        ih264d_get_bit_h264(ps_bitstrm);

    COPYTHECONTEXT(

        "Dec ref base pic marking params : "

        "u1_adaptive_ref_base_pic_marking_mode_flag",

        ps_ref_base_pic_marking_svc_ext->u1_adaptive_ref_base_pic_marking_mode_flag);

    if(1 == ps_ref_base_pic_marking_svc_ext->u1_adaptive_ref_base_pic_marking_mode_flag)

    {

        do

        {

            ps_ref_base_pic_marking_svc_ext->u4_memory_management_base_control_operation =

                ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf);

            COPYTHECONTEXT(

                "Dec ref base pic marking params : "

                "u4_memory_management_base_control_operation",

                ps_ref_base_pic_marking_svc_ext->u4_memory_management_base_control_operation);

            if(1 == ps_ref_base_pic_marking_svc_ext->u4_memory_management_base_control_operation)

            {

                ps_ref_base_pic_marking_svc_ext->u4_difference_of_base_pic_nums_minus1 =

                    ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf);

                COPYTHECONTEXT(

                    "Dec ref base pic marking params : "

                    "u4_difference_of_base_pic_nums_minus1",

                    ps_ref_base_pic_marking_svc_ext->u4_difference_of_base_pic_nums_minus1);

            }

            if(2 == ps_ref_base_pic_marking_svc_ext->u4_memory_management_base_control_operation)

            {

                ps_ref_base_pic_marking_svc_ext->u4_long_term_base_pic_num =

                    ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf);

                COPYTHECONTEXT("Dec ref base pic marking params : u4_long_term_base_pic_num",

                               ps_ref_base_pic_marking_svc_ext->u4_long_term_base_pic_num);

            }

        } while(0 != ps_ref_base_pic_marking_svc_ext->u4_memory_management_base_control_operation);

    }

    SWITCHOFFTRACE;

    return OK;

}

/*!

 **************************************************************************

 * \if Function name : isvcd_parse_nal_unit \endif

 *

 * \brief

 *    Decodes NAL unit

 *

 * \return

 *    0 on Success and error code otherwise

 **************************************************************************

 */

WORD32 isvcd_parse_nal_unit(svc_dec_lyr_struct_t *dec_svc_hdl, UWORD8 u1_nal_ref_idc)

{

    dec_bit_stream_t *ps_bitstrm;

    dec_struct_t *ps_dec;

    svc_dec_lyr_struct_t *ps_svc_lyr_dec;

    UWORD8 u1_nal_unit_type;

    WORD32 i_status = OK;

    ps_svc_lyr_dec = (svc_dec_lyr_struct_t *) dec_svc_hdl;

    ps_dec = &ps_svc_lyr_dec->s_dec;

    {

        SWITCHOFFTRACE;

        u1_nal_unit_type = ps_dec->u1_nal_unit_type;

        ps_bitstrm = ps_dec->ps_bitstrm;

        // Skip all NALUs if SPS and PPS are not decoded

        switch(u1_nal_unit_type)

        {

            case SLICE_DATA_PARTITION_A_NAL:

            case SLICE_DATA_PARTITION_B_NAL:

            case SLICE_DATA_PARTITION_C_NAL:

                if(!ps_dec->i4_decode_header) ih264d_parse_slice_partition(ps_dec, ps_bitstrm);

                break;

            case IDR_SLICE_NAL:

            case SLICE_NAL:

                if(ps_svc_lyr_dec->u1_base_res_flag != 1)

                {

                    return NOT_OK;

                }

                if(!ps_dec->i4_decode_header)

                {

                    if(ps_dec->i4_header_decoded == 3)

                    {

                        /* ! */

                        DEBUG_THREADS_PRINTF("Decoding  a slice NAL\n");

                        {

                            ih264d_get_pre_sei_params(ps_dec, u1_nal_unit_type);

                            /* ! */

                            ps_dec->u4_slice_start_code_found = 1;

                            i_status = isvcd_parse_decode_slice(

                                (UWORD8) (u1_nal_unit_type == IDR_SLICE_NAL), u1_nal_ref_idc,

                                ps_svc_lyr_dec);

                            if(i_status != OK)

                            {

                                return i_status;

                            }

                        }

                    }

                }

                break;

            case SEI_NAL:

            case PREFIX_UNIT_NAL:

            case SEQ_PARAM_NAL:

            case PIC_PARAM_NAL:

            case SUBSET_SPS_NAL:

                H264_DEC_DEBUG_PRINT("\nUnknown NAL type %d\n", u1_nal_unit_type);

                break;

            case ACCESS_UNIT_DELIMITER_RBSP:

                if(!ps_dec->i4_decode_header)

                {

                    ih264d_access_unit_delimiter_rbsp(ps_dec);

                }

                break;

                // ignore the END_OF_SEQ_RBSP NAL and decode even after this NAL

            case END_OF_STREAM_RBSP:

                if(!ps_dec->i4_decode_header)

                {

                    ih264d_parse_end_of_stream(ps_dec);

                }