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

 *

 * Copyright (C) 2023 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

*/

#include "ixheaac_type_def.h"

#include "ixheaacd_bitbuffer.h"

#include "ixheaacd_cnst.h"

#include "ixheaacd_mps_aac_struct.h"

#include "ixheaacd_mps_res_rom.h"

#include "ixheaac_basic_op.h"

#include "ixheaacd_mps_res.h"

const WORD16 *ixheaacd_res_get_sfb_offsets(

    ia_mps_dec_residual_ics_info_struct *p_ics_info,

    ia_mps_dec_residual_aac_tables_struct *aac_tables_ptr) {

  if (p_ics_info->window_sequence != EIGHT_SHORT_SEQUENCE) {

    return aac_tables_ptr->sfb_index_long;

  } else {

    return aac_tables_ptr->sfb_index_short;

  }

}

const WORD8 *ixheaacd_res_get_sfb_width(ia_mps_dec_residual_ics_info_struct *p_ics_info,

                                        ia_mps_dec_residual_aac_tables_struct *aac_tables_ptr) {

  if (p_ics_info->window_sequence != EIGHT_SHORT_SEQUENCE) {

    return aac_tables_ptr->sfb_index_long_width;

  } else {

    return aac_tables_ptr->sfb_index_short_width;

  }

}

WORD16 ixheaacd_res_ics_read(ia_bit_buf_struct *it_bif_buf,

                             ia_mps_dec_residual_ics_info_struct *p_ics_info,

                             WORD8 tot_sf_bands_ls[2]) {

  WORD i;

  WORD mask;

  WORD tmp = 0;

  tmp = ixheaacd_read_bits_buf(it_bif_buf, 4);

  p_ics_info->window_sequence = (WORD16)((tmp & 0x6) >> 1);

  if (p_ics_info->window_sequence != EIGHT_SHORT_SEQUENCE) {

    p_ics_info->total_sf_bands = tot_sf_bands_ls[0];

    p_ics_info->window_groups = 1;

    p_ics_info->window_group_length[0] = 1;

    tmp = ixheaacd_read_bits_buf(it_bif_buf, 7);

    p_ics_info->max_sf_bands = (tmp & 0x7E) >> 1;

    if (tmp & 1) {

      return (WORD16)((WORD32)AAC_DEC_PREDICTION_NOT_SUPPORTED_IN_LC_AAC);

    }

  } else {

    WORD32 win_grp = 0, tmp2;

    p_ics_info->total_sf_bands = tot_sf_bands_ls[1];

    tmp = ixheaacd_read_bits_buf(it_bif_buf, 11);

    p_ics_info->max_sf_bands = (tmp & 0x780) >> 7;

    tmp2 = (tmp & 0x7F);

    for (i = 0; i < 7; i++) {

      mask = (1 << sub_d(6, i));

      p_ics_info->window_group_length[i] = 1;

      if (tmp2 & mask) {

        p_ics_info->window_group_length[win_grp] =

            add_d(p_ics_info->window_group_length[win_grp], 1);

      } else {

        win_grp = add_d(win_grp, 1);

      }

    }

    p_ics_info->window_group_length[7] = 1;

    p_ics_info->window_groups = add_d(win_grp, 1);

  }

  if (p_ics_info->max_sf_bands > p_ics_info->total_sf_bands)

    return (WORD16)IA_XHEAAC_DEC_EXE_NONFATAL_EXCEEDS_SFB_TRANSMITTED;

  return AAC_DEC_OK;

}