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

 *                                                                            *

 * Copyright (C) 2018 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 <stdlib.h>

#include "ixheaac_type_def.h"

#include "ixheaac_error_standards.h"

#include "ixheaac_constants.h"

#include "ixheaac_basic_ops32.h"

#include "ixheaac_basic_ops16.h"

#include "ixheaac_basic_ops40.h"

#include "ixheaacd_sbr_common.h"

#include "ixheaacd_bitbuffer.h"

#include "ixheaacd_defines.h"

#include "ixheaacd_aac_rom.h"

#include "ixheaacd_sbrdecsettings.h"

#include "ixheaacd_sbr_scale.h"

#include "ixheaacd_env_extr_part.h"

#include "ixheaacd_sbr_rom.h"

#include "ixheaacd_lpp_tran.h"

#include "ixheaacd_hybrid.h"

#include "ixheaacd_ps_dec.h"

#include "ixheaacd_env_extr.h"

#include "ixheaacd_common_rom.h"

#include "ixheaacd_pulsedata.h"

#include "ixheaacd_pns.h"

#include "ixheaacd_drc_data_struct.h"

#include "ixheaacd_lt_predict.h"

#include "ixheaacd_cnst.h"

#include "ixheaacd_ec_defines.h"

#include "ixheaacd_ec_struct_def.h"

#include "ixheaacd_channelinfo.h"

#include "ixheaacd_drc_dec.h"

#include "ixheaacd_sbrdecoder.h"

#include "ixheaacd_block.h"

#include "ixheaacd_channel.h"

#include "ixheaacd_adts.h"

#include "ixheaacd_audioobjtypes.h"

#include "ixheaacd_sbrdecoder.h"

#include "ixheaacd_memory_standards.h"

#include "ixheaacd_latmdemux.h"

#include "ixheaacd_aacdec.h"

#include "ixheaacd_mps_polyphase.h"

#include "ixheaacd_config.h"

#include "ixheaacd_qmf_dec.h"

#include "ixheaacd_mps_macro_def.h"

#include "ixheaacd_mps_struct_def.h"

#include "ixheaacd_mps_res_rom.h"

#include "ixheaacd_mps_aac_struct.h"

#include "ixheaacd_mps_dec.h"

#include "ixheaacd_struct_def.h"

#include "ixheaacd_error_codes.h"

#include "ixheaacd_definitions.h"

#include "ixheaacd_adts_crc_check.h"

#include "ixheaacd_headerdecode.h"

#include "ixheaacd_interface.h"

#include "ixheaacd_info.h"

#include "ixheaacd_mps_interface.h"

#include "ixheaacd_config.h"

#include "ixheaacd_struct.h"

#include "ixheaacd_function_selector.h"

#include "ixheaacd_ld_mps_dec.h"

#include "ixheaac_error_standards.h"

#define ELDEXT_SAOC 1

#define ELDEXT_TERM 0

#define ELDEXT_LDSAC 2

extern const WORD32 ixheaacd_sampl_freq_idx_table[17];

#define AAC_LC_PROFILE (2)

#define ADTS_HEADER_LENGTH 7

static PLATFORM_INLINE VOID

ixheaacd_aac_bytealign(struct ia_bit_buf_struct *it_bit_buff) {

  WORD16 num_bit;

  num_bit = (it_bit_buff->bit_pos + 1);

  if (num_bit != 8) {

    it_bit_buff->bit_pos = 7;

    it_bit_buff->cnt_bits -= num_bit;

    it_bit_buff->ptr_read_next += 1;

  }

}

WORD32 ixheaacd_read_pce_channel_info(WORD32 ch, WORD8 *ptr_is_cpe,

                                      WORD8 *ptr_tag_select,

                                      struct ia_bit_buf_struct *it_bit_buff) {

  WORD32 num_ch = 0, i, tmp;

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

    tmp = ixheaacd_read_bits_buf(it_bit_buff, 5);

    ptr_is_cpe[i] = (tmp & 0x10) >> 4;

    if (ptr_is_cpe[i]) {

      num_ch += 2;

    } else {

      num_ch++;

    }

    ptr_tag_select[i] = (tmp & 0xF);

  }

  return num_ch;

}

VOID ixheaacd_read_pce_mixdown_data(struct ia_bit_buf_struct *it_bit_buff,

                                    WORD32 mix_down_present,

                                    WORD32 mix_down_element_no) {

  WORD32 mix_down_flag = ixheaacd_read_bits_buf(it_bit_buff, mix_down_present);

  if (mix_down_flag == 1) {

    ixheaacd_read_bits_buf(it_bit_buff, mix_down_element_no);

  }

}

VOID ixheaacd_skip_bits(struct ia_bit_buf_struct *it_bit_buff, WORD32 bits,

                        WORD32 num_element) {

  WORD32 i;

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

    ixheaacd_read_bits_buf(it_bit_buff, bits);

  }

}

WORD32 ixheaacd_read_prog_config_element(

    ia_program_config_struct *ptr_config_element,

    struct ia_bit_buf_struct *it_bit_buff) {

  WORD32 i, tmp;

  WORD count = 0, num_ch = 0;

  tmp = ixheaacd_read_bits_buf(it_bit_buff, 6);

  ptr_config_element->element_instance_tag = (tmp >> 2);

  ptr_config_element->object_type = tmp & 0x3;

  if ((ptr_config_element->object_type + 1) != 2

      && (ptr_config_element->object_type + 1) != 4

      ) {

    return IA_XHEAAC_DEC_INIT_FATAL_DEC_INIT_FAIL;

  }

  ptr_config_element->samp_freq_index = ixheaacd_read_bits_buf(it_bit_buff, 4);

  if (ptr_config_element->samp_freq_index > 11) {

    return IA_XHEAAC_DEC_EXE_NONFATAL_DECODE_FRAME_ERROR;

  }

  tmp = ixheaacd_read_bits_buf(it_bit_buff, 21);

  count += ptr_config_element->num_front_channel_elements = (tmp >> 17);

  count += ptr_config_element->num_side_channel_elements =

      (tmp & 0x1E000) >> 13;

  count += ptr_config_element->num_back_channel_elements = (tmp & 0x1E00) >> 9;

  count += ptr_config_element->num_lfe_channel_elements = (tmp & 0x180) >> 7;

  ptr_config_element->num_assoc_data_elements = (tmp & 0x70) >> 4;

  count += ptr_config_element->num_valid_cc_elements = tmp & 0xF;

  if (count > MAX_BS_ELEMENT) {

    return IA_XHEAAC_DEC_INIT_FATAL_STREAM_CHAN_GT_MAX;

  }

  ixheaacd_read_pce_mixdown_data(it_bit_buff, 1, 4);

  ixheaacd_read_pce_mixdown_data(it_bit_buff, 1, 4);

  ixheaacd_read_pce_mixdown_data(it_bit_buff, 1, 3);

  num_ch += ixheaacd_read_pce_channel_info(

      ptr_config_element->num_front_channel_elements,

      ptr_config_element->front_element_is_cpe,

      ptr_config_element->front_element_tag_select, it_bit_buff);

  num_ch += ixheaacd_read_pce_channel_info(

      ptr_config_element->num_side_channel_elements,

      ptr_config_element->side_element_is_cpe,

      ptr_config_element->side_element_tag_select, it_bit_buff);

  num_ch += ixheaacd_read_pce_channel_info(

      ptr_config_element->num_back_channel_elements,

      ptr_config_element->back_element_is_cpe,

      ptr_config_element->back_element_tag_select, it_bit_buff);

  num_ch += ptr_config_element->num_lfe_channel_elements;

  for (i = 0; i < (ptr_config_element->num_lfe_channel_elements); i++) {

    ptr_config_element->lfe_element_tag_select[i] =

        ixheaacd_read_bits_buf(it_bit_buff, 4);

  }

  ptr_config_element->channels = num_ch;

  for (i = 0; i < (ptr_config_element->num_assoc_data_elements); i++) {

    ixheaacd_read_bits_buf(it_bit_buff, 4);

  }

  ixheaacd_skip_bits(it_bit_buff, 5, ptr_config_element->num_valid_cc_elements);

  {

    WORD32 bits_to_read = ptr_config_element->alignment_bits;

    if (bits_to_read <= it_bit_buff->bit_pos) {

      bits_to_read = it_bit_buff->bit_pos - bits_to_read;

    } else {

      bits_to_read = 8 - (bits_to_read) + it_bit_buff->bit_pos;

    }

    tmp = ixheaacd_read_bits_buf(it_bit_buff, bits_to_read);

  }

  tmp = ixheaacd_read_bits_buf(it_bit_buff, 8);

  ixheaacd_skip_bits(it_bit_buff, 8, tmp);

  return 0;

}

WORD ixheaacd_decode_pce(struct ia_bit_buf_struct *it_bit_buff,

                         UWORD32 *ui_pce_found_in_hdr,

                         ia_program_config_struct *ptr_prog_config) {

  WORD32 error_code = 0;

  if (*ui_pce_found_in_hdr == 1 || *ui_pce_found_in_hdr == 3) {

    ia_program_config_struct ptr_config_element = {0};

    ptr_config_element.alignment_bits = ptr_prog_config->alignment_bits;

    error_code =

        ixheaacd_read_prog_config_element(&ptr_config_element, it_bit_buff);

    *ui_pce_found_in_hdr = 3;

  } else {

    error_code =

        ixheaacd_read_prog_config_element(ptr_prog_config, it_bit_buff);

    *ui_pce_found_in_hdr = 2;

  }

  return error_code;

}

static PLATFORM_INLINE WORD32 ixheaacd_get_adif_header(

    ia_adif_header_struct *adif, struct ia_bit_buf_struct *it_bit_buff) {

  WORD32 i;

  WORD32 ret_val = 0, tmp;

  ixheaacd_read_bits_buf(it_bit_buff, 16);

  tmp = ixheaacd_read_bits_buf(it_bit_buff, 17);

  if (tmp & 0x1) {

    ixheaacd_skip_bits(it_bit_buff, 8, 9);

  }

  tmp = ixheaacd_read_bits_buf(it_bit_buff, 3);

  adif->bit_stream_type = (tmp & 0x1);

  ixheaacd_read_bits_buf(it_bit_buff, 23);

  tmp = ixheaacd_read_bits_buf(it_bit_buff, 4);

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

    if (adif->bit_stream_type == 0) {

      ixheaacd_read_bits_buf(it_bit_buff, 20);

    }

    adif->prog_config_present = 1;

    adif->str_prog_config.alignment_bits = 7;

    ret_val =

        ixheaacd_read_prog_config_element(&adif->str_prog_config, it_bit_buff);

    if (ret_val) {

      return ret_val;

    }

  }

  return 0;

}

WORD32 ixheaacd_find_syncword(ia_adts_header_struct *adts,

                              struct ia_bit_buf_struct *it_bit_buff) {

  adts->sync_word = (WORD16)ixheaacd_read_bits_buf(it_bit_buff, 12);

  if (adts->sync_word == 0xFFF) {

    return 0;

  }

  while (1) {

    ixheaacd_read_bidirection(it_bit_buff, -4);

    if (it_bit_buff->cnt_bits < 12) {

      return IA_XHEAAC_DEC_INIT_FATAL_DEC_INIT_FAIL;

    }

    adts->sync_word = (WORD16)ixheaacd_read_bits_buf(it_bit_buff, 12);

    if (adts->sync_word == 0xFFF) {

      ixheaacd_read_bidirection(it_bit_buff, -12);

      return IA_XHEAAC_DEC_INIT_FATAL_DEC_INIT_FAIL;

    }

  }

}

WORD32 ixheaacd_adtsframe(ia_adts_header_struct *adts,

                          struct ia_bit_buf_struct *it_bit_buff) {

  WORD32 tmp;

  IA_ERRORCODE err = IA_NO_ERROR;

  WORD32 crc_reg;

  ia_adts_crc_info_struct *ptr_adts_crc_info = it_bit_buff->pstr_adts_crc_info;

  ptr_adts_crc_info->crc_active = 1;

  ptr_adts_crc_info->no_reg = 0;

  ixheaacd_read_bidirection(it_bit_buff, -12);

  crc_reg = ixheaacd_adts_crc_start_reg(ptr_adts_crc_info, it_bit_buff,

                                        CRC_ADTS_HEADER_LEN);

  err = ixheaacd_find_syncword(adts, it_bit_buff);

  if (err) return err;

  tmp = ixheaacd_read_bits_buf(it_bit_buff, 10);

  adts->id = (tmp & 0x200) >> 9;

  adts->layer = (tmp & 0x180) >> 7;

  adts->protection_absent = (tmp & 0x40) >> 6;

  adts->profile = (tmp & 0x30) >> 4;

  { adts->profile++; }

  adts->samp_freq_index = (tmp & 0xF);

  if (((adts->profile != AAC_LC_PROFILE)) || (adts->samp_freq_index > 11))

  {

    return IA_XHEAAC_DEC_INIT_FATAL_DEC_INIT_FAIL;

  }

  tmp = ixheaacd_read_bits_buf(it_bit_buff, 21);

  adts->channel_configuration = (WORD32)(tmp & 0xE0000) >> 17;

  adts->aac_frame_length = (tmp & 0x1FFF);

  tmp = ixheaacd_read_bits_buf(it_bit_buff, 13);

  adts->no_raw_data_blocks = (tmp & 0x3);

  ixheaacd_adts_crc_end_reg(ptr_adts_crc_info, it_bit_buff, crc_reg);

  if (adts->protection_absent == 0) {

    ixheaacd_skip_bits(it_bit_buff, 16, adts->no_raw_data_blocks);

    adts->crc_check = ixheaacd_read_bits_buf(it_bit_buff, 16);

    ptr_adts_crc_info->crc_active = 1;

    ptr_adts_crc_info->file_value = adts->crc_check;

  } else

    ptr_adts_crc_info->crc_active = 0;

  ixheaacd_aac_bytealign(it_bit_buff);

  return 0;

}

WORD32 ixheaacd_get_samp_rate(

    struct ia_bit_buf_struct *it_bit_buff,

    ia_sampling_rate_info_struct *pstr_samp_rate_info,

    ia_audio_specific_config_struct *pstr_audio_specific_config) {

  WORD32 index;

  WORD32 sampling_rate;

  index = ixheaacd_read_bits_buf(it_bit_buff, 4);

  pstr_audio_specific_config->samp_frequency_index = index;

  if (index == 0x0F) {

    sampling_rate = ixheaacd_read_bits_buf(it_bit_buff, 24);

    if (pstr_audio_specific_config->audio_object_type != AOT_USAC) {

      if (sampling_rate < 9391)

        sampling_rate = 8000;

      else if ((sampling_rate >= 9391) && (sampling_rate < 11502))

        sampling_rate = 11025;

      else if ((sampling_rate >= 11502) && (sampling_rate < 13856))

        sampling_rate = 12000;

      else if ((sampling_rate >= 13856) && (sampling_rate < 18783))

        sampling_rate = 16000;

      else if ((sampling_rate >= 18783) && (sampling_rate < 23004))

        sampling_rate = 22050;

      else if ((sampling_rate >= 23004) && (sampling_rate < 27713))

        sampling_rate = 24000;

      else if ((sampling_rate >= 27713) && (sampling_rate < 37566))

        sampling_rate = 32000;

      else if ((sampling_rate >= 37566) && (sampling_rate < 46009))

        sampling_rate = 44100;

      else if ((sampling_rate >= 46009) && (sampling_rate < 55426))

        sampling_rate = 48000;

      else if ((sampling_rate >= 55426) && (sampling_rate < 75132))

        sampling_rate = 64000;

      else if ((sampling_rate >= 75132) && (sampling_rate < 92017))

        sampling_rate = 88200;

      else if (sampling_rate >= 92017)

        sampling_rate = 96000;

    }

    return sampling_rate;

  } else if ((index > 12) && (index < 15)) {

    return -1;

  } else {

    return ((pstr_samp_rate_info[index].sampling_frequency));

  }

}

static int ixheaacd_get_ld_sbr_header(

    ia_bit_buf_struct *it_bit_buff,

    ia_sbr_header_data_struct *sbr_header_data) {

  WORD32 header_extra_1, header_extra_2;

  UWORD32 tmp, bit_cnt = 0;

  tmp = ixheaacd_read_bits_buf(it_bit_buff, 16);

  bit_cnt += 16;

  sbr_header_data->amp_res = (tmp & 0x8000) >> 15;

  sbr_header_data->start_freq = (tmp & 0x7800) >> 11;

  sbr_header_data->stop_freq = (tmp & 0x780) >> 7;

  sbr_header_data->xover_band = (tmp & 0x70) >> 4;

  header_extra_1 = (tmp & 0x0002) >> 1;

  header_extra_2 = (tmp & 0x0001);

  if (header_extra_1) {

    sbr_header_data->freq_scale = ixheaacd_read_bits_buf(it_bit_buff, 2);

    sbr_header_data->alter_scale = ixheaacd_read_bits_buf(it_bit_buff, 1);

    sbr_header_data->noise_bands = ixheaacd_read_bits_buf(it_bit_buff, 2);

  } else {

    sbr_header_data->freq_scale = 2;

    sbr_header_data->alter_scale = 1;

    sbr_header_data->noise_bands = 2;

  }

  if (header_extra_2) {

    sbr_header_data->limiter_bands = ixheaacd_read_bits_buf(it_bit_buff, 2);

    sbr_header_data->limiter_gains = ixheaacd_read_bits_buf(it_bit_buff, 2);

    sbr_header_data->interpol_freq = ixheaacd_read_bits_buf(it_bit_buff, 1);

    sbr_header_data->smoothing_mode = ixheaacd_read_bits_buf(it_bit_buff, 1);

  } else {

    sbr_header_data->limiter_bands = 2;

    sbr_header_data->limiter_gains = 2;

    sbr_header_data->interpol_freq = 1;

    sbr_header_data->smoothing_mode = 1;

  }

  return (bit_cnt);

}

WORD32 ixheaacd_eld_sbr_header(ia_bit_buf_struct *it_bit_buff, WORD32 channels,

                               ia_sbr_header_data_struct *pstr_sbr_config) {

  int num_sbr_header, el, bit_cnt = 0;

  switch (channels) {

    default:

      num_sbr_header = 0;

      break;

    case 1:

    case 2:

      num_sbr_header = 1;

      break;

    case 3:

      num_sbr_header = 2;

      break;

    case 4:

    case 5:

    case 6:

      num_sbr_header = 3;

      break;

    case 7:

      num_sbr_header = 4;

      break;

  }

  for (el = 0; el < num_sbr_header; el++) {

    bit_cnt = ixheaacd_get_ld_sbr_header(it_bit_buff, pstr_sbr_config);

  }

  return (bit_cnt);

}

WORD32 ixheaacd_ga_hdr_dec(ia_aac_dec_state_struct *aac_state_struct,

                           WORD32 header_len, WORD32 *bytes_consumed,

                           ia_sampling_rate_info_struct *pstr_samp_rate_info,

                           struct ia_bit_buf_struct *it_bit_buff) {

  WORD32 tmp;

  WORD32 cnt_bits = it_bit_buff->cnt_bits;

  UWORD32 aot_init;

  UWORD32 tmp_aot;

  ia_audio_specific_config_struct *pstr_audio_specific_config;

  memset(aac_state_struct->ia_audio_specific_config, 0,

         sizeof(ia_audio_specific_config_struct));

  memset(&(aac_state_struct->eld_specific_config), 0,

         sizeof(ia_eld_specific_config_struct));

  pstr_audio_specific_config = aac_state_struct->ia_audio_specific_config;

  aac_state_struct->p_config->str_prog_config.alignment_bits =

      it_bit_buff->bit_pos;

  aot_init = aac_state_struct->audio_object_type;

  aac_state_struct->frame_length = FRAME_SIZE;

  tmp_aot = ixheaacd_read_bits_buf(it_bit_buff, 5);

  if (tmp_aot == 31) {

    tmp = ixheaacd_read_bits_buf(it_bit_buff, 6);

    tmp_aot = 32 + tmp;

  }

  if (aac_state_struct->header_dec_done || aac_state_struct->ui_init_done) {

    if (tmp_aot != aot_init && tmp_aot != AOT_SBR && tmp_aot != AOT_PS)

      return IA_FATAL_ERROR;

  }

  pstr_audio_specific_config->audio_object_type =

      aac_state_struct->audio_object_type = tmp_aot;

  tmp = ixheaacd_get_samp_rate(it_bit_buff, pstr_samp_rate_info,

                               pstr_audio_specific_config);

  pstr_audio_specific_config->sampling_frequency = tmp;

  if (tmp == -1) {

    *bytes_consumed = 1;

    return IA_XHEAAC_DEC_INIT_FATAL_DEC_INIT_FAIL;

  } else

    aac_state_struct->sampling_rate = tmp;

  aac_state_struct->p_config->ui_samp_freq = tmp;

  aac_state_struct->ch_config = ixheaacd_read_bits_buf(it_bit_buff, 4);

  if (aac_state_struct->audio_object_type == AOT_USAC &&

      ((aac_state_struct->ch_config >= 3) && (aac_state_struct->ch_config != 8))) {

    return IA_XHEAAC_DEC_INIT_FATAL_DEC_INIT_FAIL;

  }

  pstr_audio_specific_config->channel_configuration =

      aac_state_struct->ch_config;

  if (aac_state_struct->audio_object_type == AOT_SBR ||

      aac_state_struct->audio_object_type == AOT_PS) {

    tmp = ixheaacd_get_samp_rate(it_bit_buff, pstr_samp_rate_info,

                                 pstr_audio_specific_config);

    aac_state_struct->sbr_present_flag = 1;

    if (tmp == -1) {

      *bytes_consumed = 1;

      return IA_XHEAAC_DEC_INIT_FATAL_DEC_INIT_FAIL;

    } else

      aac_state_struct->extension_samp_rate = tmp;

    aac_state_struct->audio_object_type =

        ixheaacd_read_bits_buf(it_bit_buff, 5);

  }

  if (aac_state_struct->header_dec_done || aac_state_struct->ui_init_done) {

    if (aac_state_struct->audio_object_type != aot_init) return IA_FATAL_ERROR;

  }

  if (((aac_state_struct->audio_object_type >= AOT_AAC_MAIN &&

        aac_state_struct->audio_object_type <= AOT_AAC_LTP) ||

       aac_state_struct->audio_object_type == AOT_AAC_SCAL ||

       aac_state_struct->audio_object_type == AOT_TWIN_VQ ||

       aac_state_struct->audio_object_type == AOT_ER_AAC_LD ||

       aac_state_struct->audio_object_type == AOT_ER_AAC_ELD ||

       aac_state_struct->audio_object_type == AOT_ER_AAC_SCAL ||

       aac_state_struct->audio_object_type == AOT_ER_AAC_LC) &&

      aac_state_struct->audio_object_type != AOT_USAC)

  {

    aac_state_struct->usac_flag = 0;

    aac_state_struct->frame_len_flag = ixheaacd_read_bits_buf(it_bit_buff, 1);

    if (aac_state_struct->audio_object_type != AOT_ER_AAC_ELD) {

      aac_state_struct->depends_on_core_coder =

          ixheaacd_read_bits_buf(it_bit_buff, 1);

      aac_state_struct->extension_flag = ixheaacd_read_bits_buf(it_bit_buff, 1);

      if (aac_state_struct->ch_config == 0) {

        WORD32 error_code;

        error_code = ixheaacd_read_prog_config_element(

            &aac_state_struct->p_config->str_prog_config, it_bit_buff);

        if (error_code != 0) {

          *bytes_consumed = 1;

          return error_code;

        }

        aac_state_struct->p_config->ui_pce_found_in_hdr = 1;

      }

    }

    if (aac_state_struct->audio_object_type == AOT_ER_AAC_ELD ||

        aac_state_struct->audio_object_type == AOT_ER_AAC_LD ||

        aac_state_struct->audio_object_type == AOT_ER_AAC_LC ||

        aac_state_struct->audio_object_type == AOT_ER_AAC_SCAL) {

      aac_state_struct->eld_specific_config.aac_sect_data_resil_flag = 0;

      aac_state_struct->eld_specific_config.aac_sf_data_resil_flag = 0;

      aac_state_struct->eld_specific_config.aac_spect_data_resil_flag = 0;

      aac_state_struct->eld_specific_config.ep_config = 0;

      if ((aac_state_struct->extension_flag == 1) ||

          aac_state_struct->audio_object_type == AOT_ER_AAC_ELD) {

        if (aac_state_struct->audio_object_type >= ER_OBJECT_START) {

          aac_state_struct->eld_specific_config.aac_sect_data_resil_flag =

              ixheaacd_read_bits_buf(it_bit_buff, 1);

          aac_state_struct->eld_specific_config.aac_sf_data_resil_flag =

              ixheaacd_read_bits_buf(it_bit_buff, 1);

          aac_state_struct->eld_specific_config.aac_spect_data_resil_flag =

              ixheaacd_read_bits_buf(it_bit_buff, 1);

          if (aac_state_struct->audio_object_type == AOT_ER_AAC_LD)

            aac_state_struct->eld_specific_config.ep_config =

                ixheaacd_read_bits_buf(it_bit_buff, 2);

          if (aac_state_struct->audio_object_type == AOT_ER_AAC_ELD)

            aac_state_struct->eld_specific_config.ld_sbr_flag_present =

                ixheaacd_read_bits_buf(it_bit_buff, 1);

        }

      }

    }

  }

  if (pstr_audio_specific_config->audio_object_type == AOT_USAC) {

    {

      pstr_audio_specific_config->sbr_present_flag = 0;

      pstr_audio_specific_config->ext_audio_object_type = 0;

    }

    {

      {

        SIZE_T tmp = 0xf;

        UWORD32 i;

        WORD32 err = 0;

        aac_state_struct->usac_flag = 1;

        ixheaacd_conf_default(&(pstr_audio_specific_config->str_usac_config));

        err = ixheaacd_config(it_bit_buff, &(pstr_audio_specific_config->str_usac_config),

                              &(pstr_audio_specific_config->channel_configuration),

                              aac_state_struct->ec_enable);

        if (err != 0) return err;

        pstr_audio_specific_config->sampling_frequency =

            pstr_audio_specific_config->str_usac_config.usac_sampling_frequency;

        if (pstr_audio_specific_config->audio_object_type == AOT_USAC) {

          pstr_audio_specific_config->sbr_present_flag = 1;

          pstr_audio_specific_config->ext_audio_object_type = AOT_SBR;

          pstr_audio_specific_config->ext_sampling_frequency =

              pstr_audio_specific_config->sampling_frequency;

          pstr_audio_specific_config->ext_samp_frequency_index =

              pstr_audio_specific_config->samp_frequency_index;

          for (i = 0; i < sizeof(ixheaacd_sampl_freq_idx_table) /

                              sizeof(ixheaacd_sampl_freq_idx_table[0]);

               i++) {

            if (ixheaacd_sampl_freq_idx_table[i] ==

                (int)(pstr_audio_specific_config->sampling_frequency)) {

              tmp = i;

              break;

            }

          }

          pstr_audio_specific_config->samp_frequency_index = (UINT32)tmp;

        } else {

          pstr_audio_specific_config->sbr_present_flag = 0;

        }

      }

    }

    if (aac_state_struct->bs_format != LOAS_BSFORMAT) {

      ixheaacd_skip_bits_buf(it_bit_buff, it_bit_buff->cnt_bits);

      if ((SIZE_T)it_bit_buff->ptr_read_next ==

          (SIZE_T)it_bit_buff->ptr_bit_buf_base) {

        *bytes_consumed = ((WORD32)it_bit_buff->size) >> 3;

      } else {

        *bytes_consumed = (WORD32)((((((SIZE_T)it_bit_buff->ptr_read_next -

                              (SIZE_T)it_bit_buff->ptr_bit_buf_base))

                            << 3) +

                            7 - it_bit_buff->bit_pos + 7) >>

                            3);

      }

    }

    return 0;

  }

  aac_state_struct->frame_length = FRAME_SIZE;

  if (aac_state_struct->frame_len_flag)

    aac_state_struct->frame_length = FRAME_SIZE_SMALL;

  if (aac_state_struct->extension_flag)

    aac_state_struct->extension_flag_3 = ixheaacd_read_bits_buf(it_bit_buff, 1);

  if (aac_state_struct->audio_object_type == AOT_ER_AAC_LD)

    aac_state_struct->frame_length >>= 1;

  if (aac_state_struct->audio_object_type == AOT_ER_AAC_ELD) {

    aac_state_struct->frame_length >>= 1;

    if (aac_state_struct->eld_specific_config.ld_sbr_flag_present) {

      aac_state_struct->eld_specific_config.ld_sbr_samp_rate =

          ixheaacd_read_bits_buf(it_bit_buff, 1);

      aac_state_struct->eld_specific_config.ld_sbr_crc_flag =

          ixheaacd_read_bits_buf(it_bit_buff, 1);

      ixheaacd_eld_sbr_header(it_bit_buff, aac_state_struct->ch_config,

                              &aac_state_struct->str_sbr_config);

      aac_state_struct->dwnsmp_signal =

          !aac_state_struct->eld_specific_config.ld_sbr_samp_rate;

    }

    {

      UWORD16 len, eld_ext_type;

      WORD32 err;

      UWORD16 cnt;

      if (ixheaacd_show_bits_buf(it_bit_buff, 4) != ELDEXT_TERM) {

        while ((eld_ext_type = ixheaacd_read_bits_buf(it_bit_buff, 4)) !=

               ELDEXT_TERM) {

          len = ixheaacd_read_bits_buf(it_bit_buff, 4);

          if (len == 15) {

            len += ixheaacd_read_bits_buf(it_bit_buff, 8);

          }

          if (len == 15 + 255) {

            len += ixheaacd_read_bits_buf(it_bit_buff, 16);

          }

          switch (eld_ext_type) {

            case ELDEXT_SAOC:

              break;

            case ELDEXT_LDSAC:

              aac_state_struct->ldmps_present = 1;

              aac_state_struct->mps_dec_handle.ldmps_config.ldmps_present_flag =

                  1;

              aac_state_struct->mps_dec_handle.object_type =

                  aac_state_struct->audio_object_type;

              aac_state_struct->mps_dec_handle.ec_flag = aac_state_struct->ec_enable;

              err = ixheaacd_ld_spatial_specific_config(

                  &(aac_state_struct->mps_dec_handle.ldmps_config), it_bit_buff);

              if (err) return err;

              if (ixheaacd_mps_create(

                      &aac_state_struct->mps_dec_handle,

                      aac_state_struct->mps_dec_handle.ldmps_config

                          .bs_frame_length,

                      0, &(aac_state_struct->mps_dec_handle.ldmps_config))) {

                return -1;

              }

              break;

            default:

              for (cnt = 0; cnt < len; cnt++) {

                ixheaacd_read_bits_buf(it_bit_buff, 8);

              }

              break;

          }

          break;

        }

      }

    }

    if (!((aac_state_struct->ldmps_present == 1) &&

          !(it_bit_buff->cnt_bits >= 1)))

    ixheaacd_read_bits_buf(it_bit_buff, 1);

  }

  if (!((aac_state_struct->ldmps_present == 1) && !(it_bit_buff->cnt_bits > 0))) {

    if (aac_state_struct->audio_object_type == AOT_ER_AAC_ELD ||

        aac_state_struct->audio_object_type == AOT_ER_AAC_LC ||

        aac_state_struct->audio_object_type == AOT_ER_AAC_SCAL) {

      WORD32 ep_config = ixheaacd_read_bits_buf(it_bit_buff, 2);

      if (ep_config == 2 || ep_config == 3) {

      }

      if (ep_config == 3) {

        WORD32 direct_map = ixheaacd_read_bits_buf(it_bit_buff, 1);

        if (!direct_map) {

        }

      }

    }

    tmp = (header_len * 8) - it_bit_buff->cnt_bits;

    if (aac_state_struct->audio_object_type != AOT_SBR &&

        (it_bit_buff->cnt_bits >= 16)) {

      tmp = ixheaacd_read_bits_buf(it_bit_buff, 11);

      if (tmp == 0x2b7) {

        tmp = ixheaacd_read_bits_buf(it_bit_buff, 5);

        if (tmp == AOT_SBR) {

          WORD32 sbr_present_flag = ixheaacd_read_bits_buf(it_bit_buff, 1);

          if (sbr_present_flag) {

            tmp = ixheaacd_get_samp_rate(it_bit_buff, pstr_samp_rate_info,

                                         pstr_audio_specific_config);

            if (tmp == -1) {

              *bytes_consumed = 1;

              return IA_XHEAAC_DEC_INIT_FATAL_DEC_INIT_FAIL;

            } else

              aac_state_struct->extension_samp_rate = tmp;

            if (it_bit_buff->cnt_bits >= 12) {

              tmp = ixheaacd_read_bits_buf(it_bit_buff, 11);

              if (tmp == 0x548) {

                tmp = ixheaacd_read_bits_buf(it_bit_buff, 1);

              }

            }

          }

        }

      } else if (aac_state_struct->bs_format == LOAS_BSFORMAT) {

        ixheaacd_read_bidirection(it_bit_buff, -11);

      }

    }

  }

  if (aac_state_struct->audio_object_type != AOT_AAC_LC &&

      aac_state_struct->audio_object_type != AOT_SBR &&

      aac_state_struct->audio_object_type != AOT_PS &&

      aac_state_struct->audio_object_type != AOT_ER_AAC_LC &&

      aac_state_struct->audio_object_type != AOT_ER_AAC_LD &&

      aac_state_struct->audio_object_type != AOT_ER_AAC_ELD &&

      aac_state_struct->audio_object_type != AOT_AAC_LTP) {

    *bytes_consumed = 1;

    return IA_XHEAAC_DEC_INIT_FATAL_AUDIOOBJECTTYPE_NOT_SUPPORTED;

  } else {

    if (aac_state_struct->bs_format == LOAS_BSFORMAT) {

      *bytes_consumed = (cnt_bits - it_bit_buff->cnt_bits) >> 3;

      if (it_bit_buff->bit_pos < 7) *bytes_consumed += 1;

    } else

      *bytes_consumed = header_len;

    return 0;

  }

}

WORD32 ixheaacd_check_if_adts(ia_adts_header_struct *adts,

                              struct ia_bit_buf_struct *it_bit_buff,

                              WORD32 usr_max_ch) {

  WORD32 max_frm_len_per_ch, result = 0;

  result = ixheaacd_adtsframe(adts, it_bit_buff);

  max_frm_len_per_ch = ixheaac_mult32(768, (adts->no_raw_data_blocks + 1));

  if (adts->channel_configuration != 0)

    max_frm_len_per_ch =

        ixheaac_mult32(max_frm_len_per_ch, adts->channel_configuration);

  else

    max_frm_len_per_ch = max_frm_len_per_ch * usr_max_ch;

  return ((result != 0) || (adts->aac_frame_length < 8) || (adts->layer != 0) ||

          (adts->profile != AAC_LC_PROFILE));

}

IA_ERRORCODE ixheaacd_latm_header_decode(

    ia_aac_dec_state_struct *aac_state_struct,

    struct ia_bit_buf_struct *it_bit_buff, WORD32 *bytes_consumed,

    ia_sampling_rate_info_struct *pstr_samp_rate_info) {

  WORD32 sync;

  IA_ERRORCODE result;

  WORD32 next_sync, audio_mux_len_bytes_last;

  WORD32 audio_mux_len_bits_last;

  WORD32 sync_status = aac_state_struct->sync_status;

  WORD32 bit_count = aac_state_struct->bit_count;

  WORD32 cnt_bits = it_bit_buff->cnt_bits;

  *bytes_consumed = 0;

  aac_state_struct->bs_format = LOAS_BSFORMAT;

  if (sync_status == 0) {

    do {

      sync = ixheaacd_read_bits_buf(it_bit_buff, 11);

      bit_count += 11;

      while (sync != 0x2B7) {

        sync = ((sync & 0x3ff) << 1) | ixheaacd_read_bits_buf(it_bit_buff, 1);

        bit_count += 1;

        if (it_bit_buff->cnt_bits < 13) {

          ixheaacd_read_bidirection(it_bit_buff, -11);

          *bytes_consumed = (cnt_bits - it_bit_buff->cnt_bits) / 8;

          return (IA_XHEAAC_DEC_INIT_NONFATAL_HEADER_NOT_AT_START);

        }

      }

      audio_mux_len_bytes_last = ixheaacd_read_bits_buf(it_bit_buff, 13);

      bit_count += 13;

      audio_mux_len_bits_last = audio_mux_len_bytes_last << 3;

      if (it_bit_buff->cnt_bits >= (audio_mux_len_bits_last + 11)) {

        ixheaacd_read_bidirection(it_bit_buff, audio_mux_len_bits_last);

        bit_count += audio_mux_len_bits_last;

        next_sync = ixheaacd_read_bits_buf(it_bit_buff, 11);

        bit_count += 11;

        if (next_sync == 0x2B7) {

          ixheaacd_read_bidirection(it_bit_buff,

                                    -(11 + audio_mux_len_bits_last + 13 + 11));

          bit_count -= 11 + audio_mux_len_bits_last + 13 + 11;

          break;

        } else {

          ixheaacd_read_bidirection(it_bit_buff,

                                    -(audio_mux_len_bits_last + 24 + 11 - 1));

          bit_count -= audio_mux_len_bits_last + 24 + 11 - 1;

        }

      } else {

        if (it_bit_buff->cnt_bits != audio_mux_len_bits_last) {

          ixheaacd_read_bidirection(it_bit_buff, -(13 + 11));

          bit_count -= (13 + 11);

          *bytes_consumed = (cnt_bits - it_bit_buff->cnt_bits) / 8;

          return IA_XHEAAC_DEC_EXE_NONFATAL_INSUFFICIENT_INPUT_BYTES;

        } else {

          ixheaacd_read_bidirection(it_bit_buff, -(13 + 11));

          bit_count -= (13 + 11);

          break;

        }

      }

    } while (1);

    do {

      WORD32 audio_mux_len_bytes_last;

      WORD32 use_same_stream_mux;

      sync = ixheaacd_read_bits_buf(it_bit_buff, 11);

      bit_count += 11;

      if (sync != 0x2b7) {

        ixheaacd_read_bidirection(it_bit_buff, -25);

        bit_count -= 11;

        *bytes_consumed = (cnt_bits - it_bit_buff->cnt_bits) / 8;

        return IA_XHEAAC_DEC_INIT_NONFATAL_HEADER_NOT_AT_START;

      }

      audio_mux_len_bytes_last = ixheaacd_read_bits_buf(it_bit_buff, 13);

      bit_count += 13;

      use_same_stream_mux = ixheaacd_read_bits_buf(it_bit_buff, 1);

      bit_count += 1;

      if (!use_same_stream_mux) {

        ixheaacd_read_bidirection(it_bit_buff, -25);

        bit_count -= 25;

        sync_status = 1;

        aac_state_struct->sync_status = sync_status;

        break;

      } else {

        ixheaacd_read_bidirection(it_bit_buff, -25);

        bit_count -= 25;

        aac_state_struct->bit_count = bit_count;

        *bytes_consumed = 1;

        return IA_XHEAAC_DEC_EXE_NONFATAL_INSUFFICIENT_INPUT_BYTES;

      }

      ixheaacd_read_bidirection(it_bit_buff, audio_mux_len_bytes_last * 8 - 1);

      bit_count += audio_mux_len_bytes_last * 8 - 1;

    } while (sync_status == 0);

    *bytes_consumed = (cnt_bits - it_bit_buff->cnt_bits) / 8;

    {

      ixheaacd_latm_struct latm_struct_element;

      WORD32 sync;

      memset(&latm_struct_element, 0, sizeof(ixheaacd_latm_struct));

      sync = ixheaacd_read_bits_buf(it_bit_buff, 11);

      if (sync == 0x2b7) {

        result = ixheaacd_latm_audio_mux_element(

            it_bit_buff, &latm_struct_element, aac_state_struct,

            pstr_samp_rate_info);

        if (result != 0) {

          sync_status = 0;

          aac_state_struct->sync_status = sync_status;

          *bytes_consumed += 1;

          return result;

        }

      }

    }

  }

  return IA_NO_ERROR;

}

WORD32 ixheaacd_aac_headerdecode(

    ia_exhaacplus_dec_api_struct *p_obj_exhaacplus_dec, UWORD8 *buffer,

    WORD32 *bytes_consumed,

    const ia_aac_dec_huffman_tables_struct *pstr_huffmann_tables) {

  struct ia_bit_buf_struct it_bit_buff = {0}, *handle_bit_buff;

  ia_adif_header_struct adif = {0};

  ia_adts_header_struct adts = {0};

  WORD32 result;

  WORD32 header_len;

  WORD32 sync = 0;

  WORD32 disable_sync = p_obj_exhaacplus_dec->aac_config.ui_disable_sync;

  WORD32 is_ga_header = p_obj_exhaacplus_dec->aac_config.ui_mp4_flag;

  WORD32 loas_present = p_obj_exhaacplus_dec->aac_config.loas_present;

  ia_aac_dec_state_struct *aac_state_struct =

      p_obj_exhaacplus_dec->pp_mem_aac[IA_ENHAACPLUS_DEC_PERSIST_IDX];

  WORD32 usr_max_ch = aac_state_struct->p_config->ui_max_channels;

  ia_sampling_rate_info_struct *pstr_samp_rate_info =

      (ia_sampling_rate_info_struct *)&pstr_huffmann_tables

          ->str_sample_rate_info[0];

  if (buffer == 0) {

    return IA_XHEAAC_DEC_INIT_FATAL_DEC_INIT_FAIL;

  }

  header_len = aac_state_struct->ui_in_bytes;

  handle_bit_buff = ixheaacd_create_bit_buf(&it_bit_buff, (UWORD8 *)buffer,

                                            (WORD16)header_len);

  handle_bit_buff->cnt_bits += (header_len << 3);

  handle_bit_buff->xaac_jmp_buf = &aac_state_struct->xaac_jmp_buf;

  if (is_ga_header == 1) {

    return ixheaacd_ga_hdr_dec(aac_state_struct, header_len, bytes_consumed,

                               pstr_samp_rate_info, handle_bit_buff);

  } else if (loas_present) {

    return ixheaacd_latm_header_decode(aac_state_struct, &it_bit_buff,

                                       bytes_consumed, pstr_samp_rate_info);

  }

  else {

    WORD32 header_found = 0;

    WORD32 bytes_taken = -1;

    WORD32 prev_offset = 0;

    WORD32 run_once = 1;