/******************************************************************************
 *                                                                            *
 * 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 <stdio.h>
#include <string.h>
#include <math.h>

#include <ixheaacd_type_def.h>
#include <ixheaacd_type_def.h>
#include "ixheaacd_memory_standards.h"
#include "ixheaacd_sbrdecsettings.h"
#include "ixheaacd_env_extr_part.h"
#include "ixheaacd_defines.h"
#include <ixheaacd_aac_rom.h>
#include "ixheaacd_common_rom.h"
#include <ixheaacd_sbr_rom.h>
#include "ixheaacd_bitbuffer.h"
#include "ixheaacd_pulsedata.h"
#include "ixheaacd_pns.h"

#include "ixheaacd_sbr_common.h"
#include "ixheaacd_drc_data_struct.h"
#include "ixheaacd_drc_dec.h"

#include "ixheaacd_lt_predict.h"
#include "ixheaacd_channelinfo.h"
#include "ixheaacd_channel.h"
#include "ixheaacd_sbrdecoder.h"
#include "ixheaacd_audioobjtypes.h"
#include "ixheaacd_latmdemux.h"
#include "ixheaacd_aacdec.h"
#include "ixheaacd_sbr_common.h"

#include "ixheaacd_mps_polyphase.h"
#include "ixheaacd_config.h"
#include "ixheaacd_mps_dec.h"
#include "ixheaacd_mps_interface.h"
#include "ixheaacd_struct_def.h"
#include "ixheaacd_config.h"
#include "ixheaacd_bitbuffer.h"
#include "ixheaacd_interface.h"

#include "ixheaacd_tns_usac.h"
#include "ixheaacd_cnst.h"
#include "ixheaacd_acelp_info.h"
#include "ixheaacd_sbrdecsettings.h"
#include "ixheaacd_info.h"
#include "ixheaacd_struct.h"

#include "ixheaacd_sbrdecoder.h"
#include "ixheaacd_mps_polyphase.h"
#include "ixheaacd_sbr_const.h"
#include "ixheaacd_main.h"
#include "ixheaacd_arith_dec.h"
#include "ixheaacd_bit_extract.h"
#include "ixheaacd_create.h"

#include "ixheaacd_func_def.h"
#include "ixheaacd_mps_interface.h"
#include "ixheaacd_mps_polyphase.h"

#include "ixheaacd_defines.h"

#include "ixheaacd_sbr_scale.h"
#include "ixheaacd_lpp_tran.h"
#include "ixheaacd_hybrid.h"
#include "ixheaacd_ps_dec.h"
#include "ixheaacd_env_extr.h"
#include "ixheaacd_env_calc.h"
#include "ixheaacd_qmf_dec.h"

#include "ixheaacd_pvc_dec.h"
#include "ixheaacd_sbr_dec.h"

#include "ixheaacd_error_codes.h"

#define MAXNRSBRELEMENTS 6

VOID ixheaacd_allocate_sbr_scr(ia_sbr_scr_struct *sbr_scratch_struct,
                               VOID *base_scratch_ptr, VOID *output_ptr,
                               WORD total_elements, WORD ch_fac,
                               WORD32 object_type);

WORD16 ixheaacd_applysbr(
    ia_handle_sbr_dec_inst_struct self,
    ia_aac_dec_sbr_bitstream_struct *p_sbr_bit_stream, WORD16 *core_sample_buf,
    WORD16 *codec_num_channels, FLAG frame_status, FLAG down_samp_flag,
    FLAG down_mix_flag, ia_sbr_scr_struct *sbr_scratch_struct, WORD32 ps_enable,
    WORD32 ch_fac, WORD32 slot_element, ia_bit_buf_struct *it_bit_buff,
    ia_drc_dec_struct *pstr_drc_dec, WORD eld_sbr_flag, WORD32 object_type);

WORD16 ixheaacd_esbr_process(ia_usac_data_struct *usac_data,
                             ia_bit_buf_struct *it_bit_buff,
                             WORD32 stereo_config_idx, WORD16 num_channels,
                             WORD32 audio_object_type) {
  WORD16 err_code = 0;
  ia_aac_dec_sbr_bitstream_struct *esbr_bit_str = &usac_data->esbr_bit_str[0];
  ia_handle_sbr_dec_inst_struct self = usac_data->pstr_esbr_dec;

  ia_sbr_scr_struct sbr_scratch_struct;
  ixheaacd_allocate_sbr_scr(&sbr_scratch_struct,
                            usac_data->sbr_scratch_mem_base, NULL, 2, 1,
                            audio_object_type);

  self->usac_independency_flag = usac_data->usac_independency_flg;

  self->time_sample_buf[0] = usac_data->time_sample_vector[0];
  self->time_sample_buf[1] = usac_data->time_sample_vector[1];
  self->stereo_config_idx = stereo_config_idx;

  self->sbr_mode = usac_data->sbr_mode;
  self->aot_usac_flag = usac_data->usac_flag;

  err_code = ixheaacd_applysbr(self, esbr_bit_str, NULL, &num_channels, 1, 0, 0,
                               &sbr_scratch_struct, 0, 1, 0, it_bit_buff, NULL,
                               0, audio_object_type);

  usac_data->sbr_mode = self->sbr_mode;

  return err_code;
}

static VOID ixheaacd_sbr_ext_data_read(
    ia_bit_buf_struct *it_bit_buff,
    ia_aac_dec_sbr_bitstream_struct *esbr_bit_str) {
  WORD32 count = 0;
  WORD32 read_bits = 0;
  WORD32 unaligned_bits = 0;
  WORD32 cnt_bits_in;

  cnt_bits_in = it_bit_buff->cnt_bits;
  count = (it_bit_buff->cnt_bits) >> 3;
  if (count > 0) {
    if ((esbr_bit_str->no_elements < MAXNRSBRELEMENTS)) {
      esbr_bit_str->str_sbr_ele[esbr_bit_str->no_elements].extension_type =
          EXT_SBR_DATA;
      esbr_bit_str->str_sbr_ele[esbr_bit_str->no_elements].size_payload = count;

      read_bits = count << 3;

      unaligned_bits = (cnt_bits_in - read_bits);
      if (unaligned_bits > 0 && unaligned_bits < 8) {
        count++;
        esbr_bit_str->str_sbr_ele[esbr_bit_str->no_elements].size_payload =
            count;
      }
      esbr_bit_str->no_elements += 1;
    }
  }
}

static WORD32 ixheaacd_read_ext_element(
    UWORD32 usac_ext_element_default_length,
    UWORD32 usac_ext_element_payload_frag, ia_bit_buf_struct *it_bit_buff,
    ia_usac_decoder_config_struct *pstr_usac_dec_config, WORD32 elem_idx) {
  UWORD32 usac_ext_element_present;
  UWORD32 usac_ext_element_use_dft_length;
  UWORD32 pay_load_length, tmp;
  UWORD32 i;
  usac_ext_element_present = ixheaacd_read_bits_buf(it_bit_buff, 1);

  if (usac_ext_element_present) {
    usac_ext_element_use_dft_length = ixheaacd_read_bits_buf(it_bit_buff, 1);

    if (usac_ext_element_use_dft_length) {
      pay_load_length = usac_ext_element_default_length;
    } else {
      pay_load_length = ixheaacd_read_bits_buf(it_bit_buff, 8);

      if (pay_load_length == 255) {
        WORD32 val_add = 0;
        val_add = ixheaacd_read_bits_buf(it_bit_buff, 16);
        pay_load_length = (UWORD32)((WORD32)pay_load_length + val_add - 2);
      }
    }
    if ((it_bit_buff->cnt_bits >> 3) < (WORD32)pay_load_length)
      return IA_ENHAACPLUS_DEC_EXE_NONFATAL_INSUFFICIENT_INPUT_BYTES;
    if (pay_load_length > 0) {
      if (usac_ext_element_payload_frag)
        tmp = ixheaacd_read_bits_buf(it_bit_buff, 2);

      if (pstr_usac_dec_config->usac_ext_ele_payload_present[elem_idx]) {
        for (i = 0; i < pay_load_length; i++) {
          pstr_usac_dec_config->usac_ext_gain_payload_buf
              [i + pstr_usac_dec_config->usac_ext_gain_payload_len] =
              ixheaacd_read_bits_buf(it_bit_buff, 8);
        }
        pstr_usac_dec_config->usac_ext_gain_payload_len += pay_load_length;
      } else {
        it_bit_buff->ptr_read_next =
            it_bit_buff->ptr_read_next + pay_load_length;
        it_bit_buff->cnt_bits =
            it_bit_buff->cnt_bits - (WORD32)(pay_load_length * 8);
      }
    }
  }
  return 0;
}

static VOID ixheaacd_sbr_ele_type_set(
    ia_aac_dec_sbr_bitstream_struct *esbr_bit_str0,
    ia_aac_dec_sbr_bitstream_struct *esbr_bit_str1, WORD32 ele_id,
    WORD32 st_config_idx) {
  if (ele_id == ID_USAC_SCE) {
    esbr_bit_str0->str_sbr_ele[esbr_bit_str0->no_elements].sbr_ele_id =
        SBR_ID_SCE;
    esbr_bit_str1->str_sbr_ele[esbr_bit_str1->no_elements].sbr_ele_id =
        SBR_ID_SCE;
  }
  if (ele_id == ID_USAC_CPE) {
    if ((st_config_idx == 0) || (st_config_idx == 3)) {
      esbr_bit_str0->str_sbr_ele[esbr_bit_str0->no_elements].sbr_ele_id =
          SBR_ID_CPE;
      esbr_bit_str1->str_sbr_ele[esbr_bit_str1->no_elements].sbr_ele_id =
          SBR_ID_CPE;
    } else {
      esbr_bit_str0->str_sbr_ele[esbr_bit_str0->no_elements].sbr_ele_id =
          SBR_ID_SCE;
      esbr_bit_str1->str_sbr_ele[esbr_bit_str1->no_elements].sbr_ele_id =
          SBR_ID_SCE;
    }
  }
  if (ele_id == ID_USAC_LFE) {
    esbr_bit_str0->str_sbr_ele[esbr_bit_str0->no_elements].sbr_ele_id =
        SBR_ID_SCE;
    esbr_bit_str1->str_sbr_ele[esbr_bit_str1->no_elements].sbr_ele_id =
        SBR_ID_SCE;

    esbr_bit_str0->no_elements++;
    esbr_bit_str0->str_sbr_ele[0].size_payload = 0;
  }
}

VOID ixheaacd_ms_processing(ia_usac_data_struct *pstr_usac_data) {
  WORD32 i;

  FLOAT32 tmp, tmp1;
  FLOAT32 ms_factor = (FLOAT32)0.7071067812;
  for (i = 0; i < pstr_usac_data->ccfl; i++) {
    tmp = (FLOAT32)((pstr_usac_data->time_sample_vector[0][i] +
                     pstr_usac_data->time_sample_vector[1][i]) *
                    ms_factor);
    tmp1 = (FLOAT32)((pstr_usac_data->time_sample_vector[0][i] -
                      pstr_usac_data->time_sample_vector[1][i]) *
                     ms_factor);
    pstr_usac_data->time_sample_vector[1][i] = tmp1;
    pstr_usac_data->time_sample_vector[0][i] = tmp;
  }
}

WORD32 ixheaacd_usac_process(ia_dec_data_struct *pstr_dec_data,
                             WORD32 *num_out_channels, VOID *codec_handle) {
  WORD32 ele_id = 0;
  WORD32 err_code = 0;

  ia_aac_dec_state_struct *p_state_aac_dec =
      (ia_aac_dec_state_struct *)codec_handle;

  ia_usac_data_struct *pstr_usac_data = &(pstr_dec_data->str_usac_data);
  ia_bit_buf_struct *it_bit_buff = &pstr_dec_data->dec_bit_buf;

  ia_frame_data_struct *fd = &(pstr_dec_data->str_frame_data);

  ia_usac_config_struct *pstr_usac_config =
      &(fd->str_audio_specific_config.str_usac_config);
  ia_usac_decoder_config_struct *pstr_usac_dec_config =
      &(fd->str_audio_specific_config.str_usac_config.str_usac_dec_config);

  WORD32 err = 0;
  WORD16 nr_core_coder_channels = 0;
  WORD32 ch_offset = 0;

  WORD32 elem_idx = 0;
  WORD32 num_elements = pstr_usac_dec_config->num_elements;

  pstr_usac_dec_config->usac_ext_gain_payload_len = 0;
  pstr_usac_data->usac_independency_flg =
      ixheaacd_read_bits_buf(it_bit_buff, 1);

  for (elem_idx = 0; elem_idx < num_elements; elem_idx++) {
    WORD32 stereo_config_index =
        pstr_usac_config->str_usac_dec_config.str_usac_element_config[elem_idx]
            .stereo_config_index;

    pstr_usac_data->esbr_bit_str[0].no_elements = 0;
    pstr_usac_data->esbr_bit_str[1].no_elements = 0;

    switch (ele_id = pstr_usac_dec_config->usac_element_type[elem_idx]) {
      case ID_USAC_SCE:
        nr_core_coder_channels = 1;
        goto core_data_extracting;

      case ID_USAC_CPE:
        nr_core_coder_channels = (stereo_config_index == 1) ? 1 : 2;
        if ((stereo_config_index > 1) &&
            (p_state_aac_dec->num_of_output_ch < 2))
          return -1;
        goto core_data_extracting;
      case ID_USAC_LFE:
        nr_core_coder_channels = 1;

      core_data_extracting:
        if (ch_offset >= MAX_NUM_CHANNELS) return -1;
        err = ixheaacd_core_coder_data(ele_id, pstr_usac_data, elem_idx,
                                       &ch_offset, it_bit_buff,
                                       nr_core_coder_channels);
        if (err != 0) return -1;

        ixheaacd_sbr_ele_type_set(&pstr_usac_data->esbr_bit_str[0],
                                  &pstr_usac_data->esbr_bit_str[1], ele_id,
                                  stereo_config_index);

        if (pstr_usac_data->mps_pseudo_lr[elem_idx])
          ixheaacd_ms_processing(pstr_usac_data);

        if (ele_id != ID_USAC_LFE) {
          if (pstr_usac_data->sbr_ratio_idx > 0)
            ixheaacd_sbr_ext_data_read(it_bit_buff,
                                       &pstr_usac_data->esbr_bit_str[0]);
        }

        if ((pstr_usac_data->sbr_ratio_idx > 0) &&
            (pstr_usac_data->esbr_bit_str[0].no_elements != 0)) {
          err_code = ixheaacd_esbr_process(
              pstr_usac_data, it_bit_buff, stereo_config_index,
              nr_core_coder_channels,
              pstr_dec_data->str_usac_data.audio_object_type);
          if (err_code < 0) return err_code;
        }

        if (stereo_config_index > 0) {
          FLOAT32 **ptr_inp[2 * 2];
          WORD32 ch;

          *num_out_channels = p_state_aac_dec->mps_dec_handle.out_ch_count;

          ixheaacd_mps_frame_parsing(&p_state_aac_dec->mps_dec_handle,
                                     pstr_usac_data->usac_independency_flg,
                                     it_bit_buff);

          for (ch = 0; ch < nr_core_coder_channels; ch++) {
            ptr_inp[2 * ch] =
                pstr_usac_data->pstr_esbr_dec->pstr_sbr_channel[ch]
                    ->str_sbr_dec.pp_qmf_buf_real;
            ptr_inp[2 * ch + 1] =
                pstr_usac_data->pstr_esbr_dec->pstr_sbr_channel[ch]
                    ->str_sbr_dec.pp_qmf_buf_imag;
            p_state_aac_dec->mps_dec_handle.p_sbr_dec[ch] =
                (VOID *)(&pstr_usac_data->pstr_esbr_dec->pstr_sbr_channel[ch]
                              ->str_sbr_dec);
            p_state_aac_dec->mps_dec_handle.p_sbr_header[ch] =
                (VOID *)(pstr_usac_data->pstr_esbr_dec->pstr_sbr_header[ch]);
            p_state_aac_dec->mps_dec_handle.p_sbr_frame[ch] =
                (VOID *)(pstr_usac_data->pstr_esbr_dec->frame_buffer[ch]);
          }
          if (nr_core_coder_channels == 1) {
            p_state_aac_dec->mps_dec_handle.p_sbr_dec[1] =
                (VOID *)(&pstr_usac_data->pstr_esbr_dec->pstr_sbr_channel[1]
                              ->str_sbr_dec);
            p_state_aac_dec->mps_dec_handle.p_sbr_header[1] =
                (VOID *)(pstr_usac_data->pstr_esbr_dec->pstr_sbr_header[1]);
            p_state_aac_dec->mps_dec_handle.p_sbr_frame[1] =
                (VOID *)(pstr_usac_data->pstr_esbr_dec->frame_buffer[1]);
          }

          err = ixheaacd_mps_apply(&p_state_aac_dec->mps_dec_handle, ptr_inp,
                                   pstr_usac_data->time_sample_vector);
          if (err) return err;
        }

        ch_offset += nr_core_coder_channels;
        break;

      case ID_USAC_EXT: {
        ia_usac_dec_element_config_struct *pusac_element_config =
            &pstr_usac_dec_config->str_usac_element_config[elem_idx];
        err = ixheaacd_read_ext_element(
            pusac_element_config->usac_ext_eleme_def_len,
            pusac_element_config->usac_ext_elem_pld_frag, it_bit_buff,
            pstr_usac_dec_config, elem_idx);
        if (err != 0) return err;

        break;
      }

      default:

        return -1;

        break;
    }
  }

  return 0;
}