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

 *                                                                            *

 * 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 <math.h>

#include <stdlib.h>

#include <string.h>

#include "ixheaac_type_def.h"

#include "ixheaace_bitbuffer.h"

#include "iusace_tns_usac.h"

#include "iusace_cnst.h"

#include "ixheaace_sbr_def.h"

#include "ixheaace_sbr_hbe.h"

#include "ixheaace_sbr_hbe_fft.h"

#include "ixheaac_error_standards.h"

#include "ixheaace_error_codes.h"

#include "ixheaac_constants.h"

#include "ixheaac_esbr_rom.h"

static FLOAT32 *ixheaace_map_prot_filter(WORD32 filt_length) {

  switch (filt_length) {

    case 4:

      return (FLOAT32 *)&ixheaac_sub_samp_qmf_window_coeff[0];

      break;

    case 8:

      return (FLOAT32 *)&ixheaac_sub_samp_qmf_window_coeff[40];

      break;

    case 12:

      return (FLOAT32 *)&ixheaac_sub_samp_qmf_window_coeff[120];

      break;

    case 16:

      return (FLOAT32 *)&ixheaac_sub_samp_qmf_window_coeff[240];

      break;

    case 20:

      return (FLOAT32 *)&ixheaac_sub_samp_qmf_window_coeff[400];

      break;

    case 24:

      return (FLOAT32 *)&ixheaac_sub_samp_qmf_window_coeff[600];

      break;

    case 32:

      return (FLOAT32 *)&ixheaac_sub_samp_qmf_window_coeff[840];

      break;

    case 40:

      return (FLOAT32 *)&ixheaac_sub_samp_qmf_window_coeff[1160];

      break;

    default:

      return (FLOAT32 *)&ixheaac_sub_samp_qmf_window_coeff[0];

  }

}

IA_ERRORCODE ixheaace_qmf_hbe_data_reinit(ixheaace_str_esbr_hbe_txposer *pstr_hbe_txposer) {

  WORD32 synth_size, sfb, patch, stop_patch;

  WORD32 upsamp_4_flag = 0;

  if (pstr_hbe_txposer != NULL) {

    pstr_hbe_txposer->start_band = pstr_hbe_txposer->ptr_freq_band_tab[IXHEAACE_LOW][0];

    pstr_hbe_txposer->end_band =

        pstr_hbe_txposer

            ->ptr_freq_band_tab[IXHEAACE_LOW][pstr_hbe_txposer->num_sf_bands[IXHEAACE_LOW]];

    pstr_hbe_txposer->synth_size = 4 * ((pstr_hbe_txposer->start_band + 4) / 8 + 1);

    pstr_hbe_txposer->k_start = ixheaac_start_subband2kL_tbl[pstr_hbe_txposer->start_band];

    upsamp_4_flag = pstr_hbe_txposer->upsamp_4_flag;

    pstr_hbe_txposer->esbr_hq = 0;

    if (upsamp_4_flag) {

      if (pstr_hbe_txposer->k_start + pstr_hbe_txposer->synth_size > 16)

        pstr_hbe_txposer->k_start = 16 - pstr_hbe_txposer->synth_size;

    } else if (pstr_hbe_txposer->core_frame_length == 768) {

      if (pstr_hbe_txposer->k_start + pstr_hbe_txposer->synth_size > 24)

        pstr_hbe_txposer->k_start = 24 - pstr_hbe_txposer->synth_size;

    }

    memset(pstr_hbe_txposer->synth_buf, 0, sizeof(pstr_hbe_txposer->synth_buf));

    synth_size = pstr_hbe_txposer->synth_size;

    pstr_hbe_txposer->synth_buf_offset = 18 * synth_size;

    switch (synth_size) {

      case 4:

        pstr_hbe_txposer->ptr_syn_cos_tab = (FLOAT32 *)ixheaac_synth_cos_table_kl_4;

        pstr_hbe_txposer->ptr_analy_cos_sin_tab = (FLOAT32 *)ixheaac_analy_cos_sin_table_kl_8;

        pstr_hbe_txposer->ixheaace_real_synth_fft = &ixheaac_real_synth_fft_p2;

        pstr_hbe_txposer->ixheaace_cmplx_anal_fft = &ixheaac_cmplx_anal_fft_p2;

        break;

      case 8:

        pstr_hbe_txposer->ptr_syn_cos_tab = (FLOAT32 *)ixheaac_synth_cos_table_kl_8;

        pstr_hbe_txposer->ptr_analy_cos_sin_tab = (FLOAT32 *)ixheaac_analy_cos_sin_table_kl_16;

        pstr_hbe_txposer->ixheaace_real_synth_fft = &ixheaac_real_synth_fft_p2;

        pstr_hbe_txposer->ixheaace_cmplx_anal_fft = &ixheaac_cmplx_anal_fft_p2;

        break;

      case 12:

        pstr_hbe_txposer->ptr_syn_cos_tab = (FLOAT32 *)ixheaac_synth_cos_table_kl_12;

        pstr_hbe_txposer->ptr_analy_cos_sin_tab = (FLOAT32 *)ixheaac_analy_cos_sin_table_kl_24;

        pstr_hbe_txposer->ixheaace_real_synth_fft = &ixheaac_real_synth_fft_p3;

        pstr_hbe_txposer->ixheaace_cmplx_anal_fft = &ixheaac_cmplx_anal_fft_p3;

        break;

      case 16:

        pstr_hbe_txposer->ptr_syn_cos_tab = (FLOAT32 *)ixheaac_synth_cos_table_kl_16;

        pstr_hbe_txposer->ptr_analy_cos_sin_tab = (FLOAT32 *)ixheaac_analy_cos_sin_table_kl_32;

        pstr_hbe_txposer->ixheaace_real_synth_fft = &ixheaac_real_synth_fft_p2;

        pstr_hbe_txposer->ixheaace_cmplx_anal_fft = &ixheaac_cmplx_anal_fft_p2;

        break;

      case 20:

        pstr_hbe_txposer->ptr_syn_cos_tab = (FLOAT32 *)ixheaac_synth_cos_table_kl_20;

        pstr_hbe_txposer->ptr_analy_cos_sin_tab = (FLOAT32 *)ixheaac_analy_cos_sin_table_kl_40;

        break;

      default:

        pstr_hbe_txposer->ptr_syn_cos_tab = (FLOAT32 *)ixheaac_synth_cos_table_kl_4;

        pstr_hbe_txposer->ptr_analy_cos_sin_tab = (FLOAT32 *)ixheaac_analy_cos_sin_table_kl_8;

        pstr_hbe_txposer->ixheaace_real_synth_fft = &ixheaac_real_synth_fft_p2;

        pstr_hbe_txposer->ixheaace_cmplx_anal_fft = &ixheaac_cmplx_anal_fft_p2;

    }

    pstr_hbe_txposer->ptr_syn_win_coeff = ixheaace_map_prot_filter(synth_size);

    memset(pstr_hbe_txposer->analy_buf, 0, sizeof(pstr_hbe_txposer->analy_buf));

    synth_size = 2 * pstr_hbe_txposer->synth_size;

    pstr_hbe_txposer->ptr_ana_win_coeff = ixheaace_map_prot_filter(synth_size);

    memset(pstr_hbe_txposer->x_over_qmf, 0, sizeof(pstr_hbe_txposer->x_over_qmf));

    sfb = 0;

    if (upsamp_4_flag) {

      stop_patch = IXHEAACE_MAX_NUM_PATCHES;

      pstr_hbe_txposer->max_stretch = IXHEAACE_MAX_STRETCH;

    } else {

      stop_patch = IXHEAACE_MAX_STRETCH;

    }

    for (patch = 1; patch <= stop_patch; patch++) {

      while (sfb <= pstr_hbe_txposer->num_sf_bands[IXHEAACE_LOW] &&

             pstr_hbe_txposer->ptr_freq_band_tab[IXHEAACE_LOW][sfb] <=

                 patch * pstr_hbe_txposer->start_band)

        sfb++;

      if (sfb <= pstr_hbe_txposer->num_sf_bands[IXHEAACE_LOW]) {

        if ((patch * pstr_hbe_txposer->start_band -

             pstr_hbe_txposer->ptr_freq_band_tab[IXHEAACE_LOW][sfb - 1]) <= 3) {

          pstr_hbe_txposer->x_over_qmf[patch - 1] =

              pstr_hbe_txposer->ptr_freq_band_tab[IXHEAACE_LOW][sfb - 1];

        } else {

          WORD32 sfb_idx = 0;

          while (sfb_idx <= pstr_hbe_txposer->num_sf_bands[IXHEAACE_HIGH] &&

                 pstr_hbe_txposer->ptr_freq_band_tab[IXHEAACE_HIGH][sfb_idx] <=

                     patch * pstr_hbe_txposer->start_band)

            sfb_idx++;

          pstr_hbe_txposer->x_over_qmf[patch - 1] =

              pstr_hbe_txposer->ptr_freq_band_tab[IXHEAACE_HIGH][sfb_idx - 1];

        }

      } else {

        pstr_hbe_txposer->x_over_qmf[patch - 1] = pstr_hbe_txposer->end_band;

        pstr_hbe_txposer->max_stretch = min(patch, IXHEAACE_MAX_STRETCH);

        break;

      }

    }

    if (pstr_hbe_txposer->k_start < 0) {

      return IA_EXHEAACE_EXE_NONFATAL_ESBR_INVALID_START_BAND;

    }

  }

  return IA_NO_ERROR;

}

IA_ERRORCODE ixheaace_qmf_hbe_apply(ixheaace_str_esbr_hbe_txposer *pstr_hbe_txposer,

                                    FLOAT32 qmf_buf_real[][64], FLOAT32 qmf_buf_imag[][64],

                                    WORD32 num_columns, FLOAT32 pv_qmf_buf_real[][64],

                                    FLOAT32 pv_qmf_buf_imag[][64], WORD32 pitch_in_bins) {

  WORD32 i, qmf_band_idx;

  WORD32 qmf_voc_columns = pstr_hbe_txposer->no_bins / 2;

  WORD32 err_code = IA_NO_ERROR;

  memcpy(

      pstr_hbe_txposer->ptr_input_buf,

      pstr_hbe_txposer->ptr_input_buf + pstr_hbe_txposer->no_bins * pstr_hbe_txposer->synth_size,

      pstr_hbe_txposer->synth_size * sizeof(pstr_hbe_txposer->ptr_input_buf[0]));

  if (pstr_hbe_txposer->ixheaace_cmplx_anal_fft == NULL) {

    err_code = ixheaace_qmf_hbe_data_reinit(pstr_hbe_txposer);

    if (err_code) {

      return err_code;

    }

  }

  err_code = ixheaace_real_synth_filt(pstr_hbe_txposer, num_columns, qmf_buf_real, qmf_buf_imag);

  if (err_code) {

    return err_code;

  }

  for (i = 0; i < IXHEAACE_HBE_OPER_WIN_LEN - 1; i++) {

    memcpy(pstr_hbe_txposer->qmf_in_buf[i], pstr_hbe_txposer->qmf_in_buf[i + qmf_voc_columns],

           sizeof(pstr_hbe_txposer->qmf_in_buf[i]));

  }

  err_code = ixheaace_complex_anal_filt(pstr_hbe_txposer);

  if (err_code) {

    return err_code;

  }

  for (i = 0; i < (pstr_hbe_txposer->hbe_qmf_out_len - pstr_hbe_txposer->no_bins); i++) {

    memcpy(pstr_hbe_txposer->qmf_out_buf[i],

           pstr_hbe_txposer->qmf_out_buf[i + pstr_hbe_txposer->no_bins],

           sizeof(pstr_hbe_txposer->qmf_out_buf[i]));

  }

  for (; i < pstr_hbe_txposer->hbe_qmf_out_len; i++) {

    memset(pstr_hbe_txposer->qmf_out_buf[i], 0, sizeof(pstr_hbe_txposer->qmf_out_buf[i]));

  }

  err_code = ixheaace_hbe_post_anal_process(pstr_hbe_txposer, pitch_in_bins,

                                            pstr_hbe_txposer->upsamp_4_flag);

  if (err_code) {

    return err_code;

  }

  i = 0;

  while (i < pstr_hbe_txposer->no_bins) {

    for (qmf_band_idx = pstr_hbe_txposer->start_band; qmf_band_idx < pstr_hbe_txposer->end_band;

         qmf_band_idx++) {

      pv_qmf_buf_real[i][qmf_band_idx] =

          (FLOAT32)(pstr_hbe_txposer->qmf_out_buf[i][2 * qmf_band_idx] *

                        ixheaac_phase_vocoder_cos_table[qmf_band_idx] -

                    pstr_hbe_txposer->qmf_out_buf[i][2 * qmf_band_idx + 1] *

                        ixheaac_phase_vocoder_sin_table[qmf_band_idx]);

      pv_qmf_buf_imag[i][qmf_band_idx] =

          (FLOAT32)(pstr_hbe_txposer->qmf_out_buf[i][2 * qmf_band_idx] *

                        ixheaac_phase_vocoder_sin_table[qmf_band_idx] +

                    pstr_hbe_txposer->qmf_out_buf[i][2 * qmf_band_idx + 1] *

                        ixheaac_phase_vocoder_cos_table[qmf_band_idx]);

    }

    i++;

  }

  return err_code;

}

VOID ixheaace_norm_qmf_in_buf_4(ixheaace_str_esbr_hbe_txposer *pstr_hbe_txposer,

                                WORD32 qmf_band_idx) {

  WORD32 i;

  FLOAT32 *ptr_in_buf = &pstr_hbe_txposer->qmf_in_buf[0][2 * qmf_band_idx];

  FLOAT32 *ptr_norm_buf = &pstr_hbe_txposer->norm_qmf_in_buf[0][2 * qmf_band_idx];

  for (; qmf_band_idx <= pstr_hbe_txposer->x_over_qmf[3]; qmf_band_idx++) {

    for (i = 0; i < pstr_hbe_txposer->hbe_qmf_in_len; i++) {

      FLOAT32 mag_scaling_fac = 0.0f;

      FLOAT32 x_r, x_i, temp;

      FLOAT64 base = 1e-17;

      x_r = ptr_in_buf[0];

      x_i = ptr_in_buf[1];

      temp = x_r * x_r;

      base = base + temp;

      temp = x_i * x_i;

      base = base + temp;

      temp = (FLOAT32)sqrt(sqrt(base));

      mag_scaling_fac = temp * (FLOAT32)(sqrt(temp));

      mag_scaling_fac = 1 / mag_scaling_fac;

      x_r *= mag_scaling_fac;

      x_i *= mag_scaling_fac;

      ptr_norm_buf[0] = x_r;

      ptr_norm_buf[1] = x_i;

      ptr_in_buf += 128;

      ptr_norm_buf += 128;

    }

    ptr_in_buf -= (128 * (pstr_hbe_txposer->hbe_qmf_in_len) - 2);

    ptr_norm_buf -= (128 * (pstr_hbe_txposer->hbe_qmf_in_len) - 2);

  }

}

VOID ixheaace_norm_qmf_in_buf_2(ixheaace_str_esbr_hbe_txposer *pstr_hbe_txposer,

                                WORD32 qmf_band_idx) {

  WORD32 i;

  FLOAT32 *ptr_in_buf = &pstr_hbe_txposer->qmf_in_buf[0][2 * qmf_band_idx];

  FLOAT32 *ptr_norm_buf = &pstr_hbe_txposer->norm_qmf_in_buf[0][2 * qmf_band_idx];

  for (; qmf_band_idx <= pstr_hbe_txposer->x_over_qmf[1]; qmf_band_idx++) {

    for (i = 0; i < pstr_hbe_txposer->hbe_qmf_in_len; i++) {

      FLOAT32 mag_scaling_fac = 0.0f;

      FLOAT32 x_r, x_i, temp;

      FLOAT64 base = 1e-17;

      x_r = ptr_in_buf[0];

      x_i = ptr_in_buf[1];

      temp = x_r * x_r;

      base = base + temp;

      base = base + x_i * x_i;

      mag_scaling_fac = (FLOAT32)(1.0f / base);

      mag_scaling_fac = (FLOAT32)sqrt(sqrt(mag_scaling_fac));

      x_r *= mag_scaling_fac;

      x_i *= mag_scaling_fac;

      ptr_norm_buf[0] = x_r;

      ptr_norm_buf[1] = x_i;

      ptr_in_buf += 128;

      ptr_norm_buf += 128;

    }

    ptr_in_buf -= (128 * (pstr_hbe_txposer->hbe_qmf_in_len) - 2);

    ptr_norm_buf -= (128 * (pstr_hbe_txposer->hbe_qmf_in_len) - 2);

  }

}

VOID ixheaace_hbe_xprod_proc_3(ixheaace_str_esbr_hbe_txposer *pstr_hbe_txposer,

                               WORD32 qmf_band_idx, WORD32 qmf_col_idx, FLOAT32 p,

                               WORD32 pitch_in_bins_idx) {

  WORD32 tr, n1, n2, max_trans_fac, max_n1, max_n2;

  WORD32 k, addrshift;

  WORD32 inp_band_idx = 2 * qmf_band_idx / 3;

  FLOAT64 temp_fac;

  FLOAT32 max_mag_value;

  FLOAT32 mag_zero_band, mag_n1_band, mag_n2_band, temp;

  FLOAT32 temp_r, temp_i;

  FLOAT32 mag_cmplx_gain = 1.8856f;

  FLOAT32 *ptr_qmf_in_buf_ri =

      pstr_hbe_txposer->qmf_in_buf[qmf_col_idx + IXHEAACE_HBE_ZERO_BAND_IDX];

  mag_zero_band =

      ptr_qmf_in_buf_ri[2 * inp_band_idx] * ptr_qmf_in_buf_ri[2 * inp_band_idx] +

      ptr_qmf_in_buf_ri[2 * inp_band_idx + 1] * ptr_qmf_in_buf_ri[2 * inp_band_idx + 1];

  max_mag_value = 0;

  max_n1 = max_n2 = max_trans_fac = 0;

  for (tr = 1; tr < 3; tr++) {

    temp_fac = (2.0f * qmf_band_idx + 1 - tr * p) * 0.3333334;

    n1 = (WORD32)(temp_fac);

    n2 = (WORD32)(temp_fac + p);

    mag_n1_band = ptr_qmf_in_buf_ri[2 * n1] * ptr_qmf_in_buf_ri[2 * n1] +

                  ptr_qmf_in_buf_ri[2 * n1 + 1] * ptr_qmf_in_buf_ri[2 * n1 + 1];

    mag_n2_band = ptr_qmf_in_buf_ri[2 * n2] * ptr_qmf_in_buf_ri[2 * n2] +

                  ptr_qmf_in_buf_ri[2 * n2 + 1] * ptr_qmf_in_buf_ri[2 * n2 + 1];

    temp = min(mag_n1_band, mag_n2_band);

    if (temp > max_mag_value) {

      max_mag_value = temp;

      max_trans_fac = tr;

      max_n1 = n1;

      max_n2 = n2;

    }

  }

  if ((max_mag_value > mag_zero_band && max_n1 >= 0) &&

      (max_n2 < IXHEAACE_NUM_QMF_SYNTH_CHANNELS)) {

    FLOAT32 vec_y_r[2], vec_y_i[2], vec_o_r[2], vec_o_i[2];

    FLOAT32 coeff_real[2], coeff_imag[2];

    FLOAT32 d1, d2;

    WORD32 mid_trans_fac, idx;

    FLOAT64 base = 1e-17;

    FLOAT32 mag_scaling_fac = 0;

    FLOAT32 x_zero_band_r;

    FLOAT32 x_zero_band_i;

    mid_trans_fac = 3 - max_trans_fac;

    if (max_trans_fac == 1) {

      d1 = 0;

      d2 = 1.5;

      x_zero_band_r = ptr_qmf_in_buf_ri[2 * max_n1];

      x_zero_band_i = ptr_qmf_in_buf_ri[2 * max_n1 + 1];

      idx = max_n2 & 3;

      idx = (idx + 1) & 3;

      coeff_real[0] = ixheaac_hbe_post_anal_proc_interp_coeff[idx][0];

      coeff_imag[0] = ixheaac_hbe_post_anal_proc_interp_coeff[idx][1];

      coeff_real[1] = coeff_real[0];

      coeff_imag[1] = -coeff_imag[0];

      vec_y_r[1] = ptr_qmf_in_buf_ri[2 * max_n2];

      vec_y_i[1] = ptr_qmf_in_buf_ri[2 * max_n2 + 1];

      addrshift = -2;

      temp_r = pstr_hbe_txposer

                   ->qmf_in_buf[qmf_col_idx + addrshift + IXHEAACE_HBE_ZERO_BAND_IDX][2 * max_n2];

      temp_i =

          pstr_hbe_txposer

              ->qmf_in_buf[qmf_col_idx + addrshift + IXHEAACE_HBE_ZERO_BAND_IDX][2 * max_n2 + 1];

      vec_y_r[0] = coeff_real[1] * temp_r - coeff_imag[1] * temp_i;

      vec_y_i[0] = coeff_imag[1] * temp_r + coeff_real[1] * temp_i;

      temp_r =

          pstr_hbe_txposer

              ->qmf_in_buf[qmf_col_idx + addrshift + 1 + IXHEAACE_HBE_ZERO_BAND_IDX][2 * max_n2];

      temp_i = pstr_hbe_txposer->qmf_in_buf[qmf_col_idx + addrshift + 1 +

                                            IXHEAACE_HBE_ZERO_BAND_IDX][2 * max_n2 + 1];

      vec_y_r[0] += coeff_real[0] * temp_r - coeff_imag[0] * temp_i;

      vec_y_i[0] += coeff_imag[0] * temp_r + coeff_real[0] * temp_i;

    } else {

      d1 = 1.5;

      d2 = 0;

      mid_trans_fac = max_trans_fac;

      max_trans_fac = 3 - max_trans_fac;

      x_zero_band_r = ptr_qmf_in_buf_ri[2 * max_n2];

      x_zero_band_i = ptr_qmf_in_buf_ri[2 * max_n2 + 1];

      idx = (max_n1 & 3);

      idx = (idx + 1) & 3;

      coeff_real[0] = ixheaac_hbe_post_anal_proc_interp_coeff[idx][0];

      coeff_imag[0] = ixheaac_hbe_post_anal_proc_interp_coeff[idx][1];

      coeff_real[1] = coeff_real[0];

      coeff_imag[1] = -coeff_imag[0];

      vec_y_r[1] = ptr_qmf_in_buf_ri[2 * max_n1];

      vec_y_i[1] = ptr_qmf_in_buf_ri[2 * max_n1 + 1];

      addrshift = -2;

      temp_r = pstr_hbe_txposer

                   ->qmf_in_buf[qmf_col_idx + addrshift + IXHEAACE_HBE_ZERO_BAND_IDX][2 * max_n1];

      temp_i =

          pstr_hbe_txposer

              ->qmf_in_buf[qmf_col_idx + addrshift + IXHEAACE_HBE_ZERO_BAND_IDX][2 * max_n1 + 1];

      vec_y_r[0] = coeff_real[1] * temp_r - coeff_imag[1] * temp_i;

      vec_y_i[0] = coeff_imag[1] * temp_r + coeff_real[1] * temp_i;

      temp_r =

          pstr_hbe_txposer

              ->qmf_in_buf[qmf_col_idx + addrshift + 1 + IXHEAACE_HBE_ZERO_BAND_IDX][2 * max_n1];

      temp_i = pstr_hbe_txposer->qmf_in_buf[qmf_col_idx + addrshift + 1 +

                                            IXHEAACE_HBE_ZERO_BAND_IDX][2 * max_n1 + 1];

      vec_y_r[0] += coeff_real[0] * temp_r - coeff_imag[0] * temp_i;

      vec_y_i[0] += coeff_imag[0] * temp_r + coeff_real[0] * temp_i;

    }

    base = 1e-17;

    base = base + x_zero_band_r * x_zero_band_r;

    base = base + x_zero_band_i * x_zero_band_i;

    mag_scaling_fac = (FLOAT32)(ixheaace_cbrt_calc((FLOAT32)base));

    x_zero_band_r *= mag_scaling_fac;

    x_zero_band_i *= mag_scaling_fac;

    for (k = 0; k < 2; k++) {

      base = 1e-17;

      base = base + vec_y_r[k] * vec_y_r[k];

      base = base + vec_y_i[k] * vec_y_i[k];

      mag_scaling_fac = (FLOAT32)(ixheaace_cbrt_calc((FLOAT32)base));

      vec_y_r[k] *= mag_scaling_fac;

      vec_y_i[k] *= mag_scaling_fac;

    }

    temp_r = x_zero_band_r;

    temp_i = x_zero_band_i;

    for (idx = 0; idx < mid_trans_fac - 1; idx++) {

      FLOAT32 tmp = x_zero_band_r;

      x_zero_band_r = x_zero_band_r * temp_r - x_zero_band_i * temp_i;

      x_zero_band_i = tmp * temp_i + x_zero_band_i * temp_r;

    }

    for (k = 0; k < 2; k++) {

      temp_r = vec_y_r[k];

      temp_i = vec_y_i[k];

      for (idx = 0; idx < max_trans_fac - 1; idx++) {

        FLOAT32 tmp = vec_y_r[k];

        vec_y_r[k] = vec_y_r[k] * temp_r - vec_y_i[k] * temp_i;

        vec_y_i[k] = tmp * temp_i + vec_y_i[k] * temp_r;

      }

    }

    for (k = 0; k < 2; k++) {

      vec_o_r[k] = vec_y_r[k] * x_zero_band_r - vec_y_i[k] * x_zero_band_i;

      vec_o_i[k] = vec_y_r[k] * x_zero_band_i + vec_y_i[k] * x_zero_band_r;

    }

    {

      FLOAT32 cos_theta = ixheaac_hbe_x_prod_cos_table_trans_3[(pitch_in_bins_idx << 1) + 0];

      FLOAT32 sin_theta = ixheaac_hbe_x_prod_cos_table_trans_3[(pitch_in_bins_idx << 1) + 1];

      if (d2 < d1) {

        sin_theta = -sin_theta;

      }

      temp_r = vec_o_r[0];

      temp_i = vec_o_i[0];

      vec_o_r[0] = (FLOAT32)(cos_theta * temp_r - sin_theta * temp_i);

      vec_o_i[0] = (FLOAT32)(cos_theta * temp_i + sin_theta * temp_r);

    }

    for (k = 0; k < 2; k++) {

      pstr_hbe_txposer->qmf_out_buf[qmf_col_idx * 2 + (k + IXHEAACE_HBE_ZERO_BAND_IDX - 1)]

                                   [2 * qmf_band_idx] += (FLOAT32)(mag_cmplx_gain * vec_o_r[k]);

      pstr_hbe_txposer->qmf_out_buf[qmf_col_idx * 2 + (k + IXHEAACE_HBE_ZERO_BAND_IDX - 1)]

                                   [2 * qmf_band_idx + 1] +=

          (FLOAT32)(mag_cmplx_gain * vec_o_i[k]);

    }

  }

}

VOID ixheaace_hbe_xprod_proc_4(ixheaace_str_esbr_hbe_txposer *pstr_hbe_txposer,

                               WORD32 qmf_band_idx, WORD32 qmf_col_idx, FLOAT32 p,

                               WORD32 pitch_in_bins_idx) {

  WORD32 k;

  WORD32 inp_band_idx = qmf_band_idx >> 1;

  WORD32 tr, n1, n2, max_trans_fac, max_n1, max_n2;

  FLOAT64 temp_fac;

  FLOAT32 max_mag_value, mag_zero_band, mag_n1_band, mag_n2_band, temp;

  FLOAT32 temp_r, temp_i;

  FLOAT32 mag_cmplx_gain = 2.0f;

  FLOAT32 *ptr_qmf_in_buf_ri =

      pstr_hbe_txposer->qmf_in_buf[qmf_col_idx + IXHEAACE_HBE_ZERO_BAND_IDX];

  mag_zero_band =

      ptr_qmf_in_buf_ri[2 * inp_band_idx] * ptr_qmf_in_buf_ri[2 * inp_band_idx] +

      ptr_qmf_in_buf_ri[2 * inp_band_idx + 1] * ptr_qmf_in_buf_ri[2 * inp_band_idx + 1];

  max_mag_value = 0;

  max_n1 = max_n2 = max_trans_fac = 0;

  tr = 1;

  while (tr < 4) {

    temp_fac = (2.0 * qmf_band_idx + 1 - tr * p) * 0.25;

    n1 = ((WORD32)(temp_fac)) << 1;

    n2 = ((WORD32)(temp_fac + p)) << 1;

    mag_n1_band = ptr_qmf_in_buf_ri[n1] * ptr_qmf_in_buf_ri[n1] +

                  ptr_qmf_in_buf_ri[n1 + 1] * ptr_qmf_in_buf_ri[n1 + 1];

    mag_n2_band = ptr_qmf_in_buf_ri[n2] * ptr_qmf_in_buf_ri[n2] +

                  ptr_qmf_in_buf_ri[n2 + 1] * ptr_qmf_in_buf_ri[n2 + 1];

    temp = min(mag_n1_band, mag_n2_band);

    if (temp > max_mag_value) {

      max_mag_value = temp;

      max_trans_fac = tr;

      max_n1 = n1;

      max_n2 = n2;

    }

    tr++;

  }

  if (max_mag_value > mag_zero_band && max_n1 >= 0 && max_n2 < IXHEAACE_TWICE_QMF_SYNTH_CH_NUM) {

    FLOAT32 vec_y_r[2], vec_y_i[2], vec_o_r[2], vec_o_i[2];

    FLOAT32 d1, d2;

    WORD32 mid_trans_fac, idx;

    FLOAT32 x_zero_band_r;

    FLOAT32 x_zero_band_i;

    FLOAT64 base = 1e-17;

    FLOAT32 mag_scaling_fac = 0.0f;

    mid_trans_fac = 4 - max_trans_fac;

    if (max_trans_fac == 1) {

      d1 = 0;

      d2 = 2;

      x_zero_band_r = ptr_qmf_in_buf_ri[max_n1];

      x_zero_band_i = ptr_qmf_in_buf_ri[max_n1 + 1];

      for (k = 0; k < 2; k++) {

        vec_y_r[k] =

            pstr_hbe_txposer

                ->qmf_in_buf[qmf_col_idx + IXHEAACE_HBE_ZERO_BAND_IDX + 2 * (k - 1)][max_n2];

        vec_y_i[k] =

            pstr_hbe_txposer

                ->qmf_in_buf[qmf_col_idx + IXHEAACE_HBE_ZERO_BAND_IDX + 2 * (k - 1)][max_n2 + 1];

      }

    } else if (max_trans_fac == 2) {

      d1 = 0;

      d2 = 1;

      x_zero_band_r = ptr_qmf_in_buf_ri[max_n1];

      x_zero_band_i = ptr_qmf_in_buf_ri[max_n1 + 1];

      for (k = 0; k < 2; k++) {

        vec_y_r[k] = pstr_hbe_txposer

                         ->qmf_in_buf[qmf_col_idx + IXHEAACE_HBE_ZERO_BAND_IDX + (k - 1)][max_n2];

        vec_y_i[k] =

            pstr_hbe_txposer

                ->qmf_in_buf[qmf_col_idx + IXHEAACE_HBE_ZERO_BAND_IDX + (k - 1)][max_n2 + 1];

      }

    } else {

      d1 = 2;

      d2 = 0;

      mid_trans_fac = max_trans_fac;

      max_trans_fac = 4 - max_trans_fac;

      x_zero_band_r = ptr_qmf_in_buf_ri[max_n2];

      x_zero_band_i = ptr_qmf_in_buf_ri[max_n2 + 1];

      for (k = 0; k < 2; k++) {

        vec_y_r[k] =

            pstr_hbe_txposer

                ->qmf_in_buf[qmf_col_idx + IXHEAACE_HBE_ZERO_BAND_IDX + 2 * (k - 1)][max_n1];

        vec_y_i[k] =

            pstr_hbe_txposer

                ->qmf_in_buf[qmf_col_idx + IXHEAACE_HBE_ZERO_BAND_IDX + 2 * (k - 1)][max_n1 + 1];

      }

    }

    base = 1e-17;

    base = base + x_zero_band_r * x_zero_band_r;

    base = base + x_zero_band_i * x_zero_band_i;

    {

      temp = (FLOAT32)sqrt(sqrt(base));

      mag_scaling_fac = temp * (FLOAT32)(sqrt(temp));

      mag_scaling_fac = 1 / mag_scaling_fac;

    }

    x_zero_band_r *= mag_scaling_fac;

    x_zero_band_i *= mag_scaling_fac;

    for (k = 0; k < 2; k++) {

      base = 1e-17;

      base = base + vec_y_r[k] * vec_y_r[k];

      base = base + vec_y_i[k] * vec_y_i[k];

      {

        temp = (FLOAT32)sqrt(sqrt(base));

        mag_scaling_fac = temp * (FLOAT32)(sqrt(temp));

        mag_scaling_fac = 1 / mag_scaling_fac;

      }

      vec_y_r[k] *= mag_scaling_fac;

      vec_y_i[k] *= mag_scaling_fac;

    }

    temp_r = x_zero_band_r;

    temp_i = x_zero_band_i;

    for (idx = 0; idx < mid_trans_fac - 1; idx++) {

      FLOAT32 tmp = x_zero_band_r;

      x_zero_band_r = x_zero_band_r * temp_r - x_zero_band_i * temp_i;

      x_zero_band_i = tmp * temp_i + x_zero_band_i * temp_r;

    }

    for (k = 0; k < 2; k++) {

      temp_r = vec_y_r[k];

      temp_i = vec_y_i[k];

      for (idx = 0; idx < max_trans_fac - 1; idx++) {

        FLOAT32 tmp = vec_y_r[k];

        vec_y_r[k] = vec_y_r[k] * temp_r - vec_y_i[k] * temp_i;

        vec_y_i[k] = tmp * temp_i + vec_y_i[k] * temp_r;

      }

    }

    for (k = 0; k < 2; k++) {

      vec_o_r[k] = vec_y_r[k] * x_zero_band_r - vec_y_i[k] * x_zero_band_i;

      vec_o_i[k] = vec_y_r[k] * x_zero_band_i + vec_y_i[k] * x_zero_band_r;

    }

    {

      FLOAT32 cos_theta;

      FLOAT32 sin_theta;

      if (d2 == 1) {

        cos_theta = ixheaac_hbe_x_prod_cos_table_trans_4_1[(pitch_in_bins_idx << 1) + 0];

        sin_theta = ixheaac_hbe_x_prod_cos_table_trans_4_1[(pitch_in_bins_idx << 1) + 1];

      } else {

        cos_theta = ixheaac_hbe_x_prod_cos_table_trans_4[(pitch_in_bins_idx << 1) + 0];

        sin_theta = ixheaac_hbe_x_prod_cos_table_trans_4[(pitch_in_bins_idx << 1) + 1];

        if (d2 < d1) {

          sin_theta = -sin_theta;

        }

      }

      temp_r = vec_o_r[0];

      temp_i = vec_o_i[0];

      vec_o_r[0] = (FLOAT32)(cos_theta * temp_r - sin_theta * temp_i);

      vec_o_i[0] = (FLOAT32)(cos_theta * temp_i + sin_theta * temp_r);

    }

    for (k = 0; k < 2; k++) {

      pstr_hbe_txposer->qmf_out_buf[qmf_col_idx * 2 + (k + IXHEAACE_HBE_ZERO_BAND_IDX - 1)]

                                   [2 * qmf_band_idx] += (FLOAT32)(mag_cmplx_gain * vec_o_r[k]);

      pstr_hbe_txposer->qmf_out_buf[qmf_col_idx * 2 + (k + IXHEAACE_HBE_ZERO_BAND_IDX - 1)]

                                   [2 * qmf_band_idx + 1] +=

          (FLOAT32)(mag_cmplx_gain * vec_o_i[k]);

    }

  }

}

VOID ixheaace_hbe_post_anal_prod2(ixheaace_str_esbr_hbe_txposer *pstr_hbe_txposer,

                                  WORD32 qmf_voc_columns, WORD32 qmf_band_idx) {

  WORD32 i;

  FLOAT32 *ptr_norm = &pstr_hbe_txposer->norm_qmf_in_buf[1][2 * qmf_band_idx];

  FLOAT32 *ptr_out = &pstr_hbe_txposer->qmf_out_buf[1][2 * qmf_band_idx];

  FLOAT32 *ptr_x_norm =

      &pstr_hbe_txposer->norm_qmf_in_buf[IXHEAACE_HBE_ZERO_BAND_IDX][2 * qmf_band_idx];

  ixheaace_norm_qmf_in_buf_2(pstr_hbe_txposer, qmf_band_idx);

  for (; qmf_band_idx < pstr_hbe_txposer->x_over_qmf[1]; qmf_band_idx++) {

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

      WORD32 k;

      FLOAT32 x_zero_band_r, x_zero_band_i;

      x_zero_band_r = *ptr_x_norm++;

      x_zero_band_i = *ptr_x_norm++;

      for (k = 0; k < IXHEAACE_HBE_OPER_BLK_LEN_2; k++) {

        register FLOAT32 tmp_r, tmp_i;

        tmp_r = *ptr_norm++;

        tmp_i = *ptr_norm++;

        *ptr_out++ += ((tmp_r * x_zero_band_r - tmp_i * x_zero_band_i) * 0.3333333f);

        *ptr_out++ += ((tmp_r * x_zero_band_i + tmp_i * x_zero_band_r) * 0.3333333f);

        ptr_norm += 126;

        ptr_out += 126;

      }

      ptr_norm -= 128 * 9;

      ptr_out -= 128 * 8;

      ptr_x_norm += 126;

    }

    ptr_out -= (128 * 2 * qmf_voc_columns) - 2;

    ptr_norm -= (128 * qmf_voc_columns) - 2;

    ptr_x_norm -= (128 * qmf_voc_columns) - 2;

  }

}

VOID ixheaace_hbe_post_anal_prod3(ixheaace_str_esbr_hbe_txposer *pstr_hbe_txposer,

                                  WORD32 qmf_voc_columns, WORD32 qmf_band_idx) {

  WORD32 i, inp_band_idx, rem;

  FLOAT32 *ptr_out_buf = &pstr_hbe_txposer->qmf_out_buf[2][2 * qmf_band_idx];

  for (; qmf_band_idx < pstr_hbe_txposer->x_over_qmf[2]; qmf_band_idx++) {

    FLOAT32 temp_r, temp_i;

    FLOAT32 temp_r1, temp_i1;

    const FLOAT32 *ptr_sel, *ptr_sel1;

    inp_band_idx = (2 * qmf_band_idx) / 3;

    ptr_sel = &ixheaac_sel_case[(inp_band_idx + 1) & 3][0];

    ptr_sel1 = &ixheaac_sel_case[((inp_band_idx + 1) & 3) + 1][0];

    rem = 2 * qmf_band_idx - 3 * inp_band_idx;

    if (rem == 0 || rem == 1) {

      FLOAT32 *ptr_in_buf = &pstr_hbe_txposer->qmf_in_buf[0][2 * inp_band_idx];

      for (i = 0; i < qmf_voc_columns; i += 1) {

        WORD32 k;

        FLOAT32 vec_x[2 * IXHEAACE_HBE_OPER_WIN_LEN];

        FLOAT32 *ptr_vec_x = &vec_x[0];

        FLOAT32 x_zero_band_r, x_zero_band_i;

        FLOAT32 mag_scaling_fac;

        for (k = 0; k < (IXHEAACE_HBE_OPER_BLK_LEN_3); k += 2) {

          FLOAT64 base1;

          FLOAT64 base = 1e-17;

          temp_r = ptr_in_buf[0];

          temp_i = ptr_in_buf[1];

          ptr_in_buf += 256;

          base1 = base + temp_r * temp_r;

          base1 = base1 + temp_i * temp_i;

          mag_scaling_fac = (FLOAT32)(ixheaace_cbrt_calc((FLOAT32)base1));

          ptr_vec_x[0] = temp_r * mag_scaling_fac;

          ptr_vec_x[1] = temp_i * mag_scaling_fac;

          temp_r = ptr_in_buf[0];

          temp_i = ptr_in_buf[1];

          ptr_in_buf -= 128;

          temp_r1 = ptr_sel[0] * temp_r + ptr_sel[1] * temp_i;

          temp_i1 = ptr_sel[2] * temp_r + ptr_sel[3] * temp_i;

          temp_r = ptr_in_buf[0];

          temp_i = ptr_in_buf[1];

          temp_r1 += ptr_sel[4] * temp_r + ptr_sel[5] * temp_i;

          temp_i1 += ptr_sel[6] * temp_r + ptr_sel[7] * temp_i;

          temp_r1 *= 0.3984033437f;

          temp_i1 *= 0.3984033437f;

          base1 = base + temp_r1 * temp_r1;

          base1 = base1 + temp_i1 * temp_i1;

          mag_scaling_fac = (FLOAT32)(ixheaace_cbrt_calc((FLOAT32)base1));

          ptr_vec_x[2] = temp_r1 * mag_scaling_fac;

          ptr_vec_x[3] = temp_i1 * mag_scaling_fac;

          ptr_vec_x += 4;

          ptr_in_buf += 256;

        }

        ptr_vec_x = &vec_x[0];

        temp_r = vec_x[2 * (IXHEAACE_HBE_ZERO_BAND_IDX - 2)];

        temp_i = vec_x[(2 * (IXHEAACE_HBE_ZERO_BAND_IDX - 2)) + 1];

        x_zero_band_r = temp_r * temp_r - temp_i * temp_i;

        x_zero_band_i = temp_r * temp_i + temp_i * temp_r;

        for (k = 0; k < (IXHEAACE_HBE_OPER_BLK_LEN_3); k++) {

          temp_r = ptr_vec_x[0] * x_zero_band_r - ptr_vec_x[1] * x_zero_band_i;

          temp_i = ptr_vec_x[0] * x_zero_band_i + ptr_vec_x[1] * x_zero_band_r;

          ptr_out_buf[0] += (temp_r * 0.4714045f);

          ptr_out_buf[1] += (temp_i * 0.4714045f);

          ptr_vec_x += 2;

          ptr_out_buf += 128;

        }

        ptr_in_buf -= 128 * 11;

        ptr_out_buf -= 128 * 6;

      }

    } else {

      FLOAT32 *ptr_in_buf = &pstr_hbe_txposer->qmf_in_buf[0][2 * inp_band_idx];

      FLOAT32 *ptr_in_buf1 = &pstr_hbe_txposer->qmf_in_buf[0][2 * (inp_band_idx + 1)];

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

        WORD32 k;

        FLOAT32 vec_x[2 * IXHEAACE_HBE_OPER_WIN_LEN];

        FLOAT32 vec_x_cap[2 * IXHEAACE_HBE_OPER_WIN_LEN];

        FLOAT32 x_zero_band_r, x_zero_band_i;

        FLOAT32 *ptr_vec_x = &vec_x[0];

        FLOAT32 *ptr_vec_x_cap = &vec_x_cap[0];

        FLOAT32 mag_scaling_fac;

        for (k = 0; k < (IXHEAACE_HBE_OPER_BLK_LEN_3); k += 2) {

          FLOAT32 tmp_vr, tmp_vi;

          FLOAT32 tmp_cr, tmp_ci;

          FLOAT64 base1;

          FLOAT64 base = 1e-17;

          temp_r1 = ptr_in_buf[0];

          temp_i1 = ptr_in_buf[1];

          temp_r = ptr_in_buf1[0];

          temp_i = ptr_in_buf1[1];

          base1 = base + temp_r * temp_r;

          base1 = base1 + temp_i * temp_i;

          mag_scaling_fac = (FLOAT32)(ixheaace_cbrt_calc((FLOAT32)base1));

          ptr_vec_x[0] = temp_r * mag_scaling_fac;

          ptr_vec_x[1] = temp_i * mag_scaling_fac;

          base1 = base + temp_r1 * temp_r1;

          base1 = base1 + temp_i1 * temp_i1;

          mag_scaling_fac = (FLOAT32)(ixheaace_cbrt_calc((FLOAT32)base1));

          ptr_vec_x_cap[0] = temp_r1 * mag_scaling_fac;

          ptr_vec_x_cap[1] = temp_i1 * mag_scaling_fac;

          ptr_in_buf += 256;

          temp_r = ptr_in_buf[0];

          temp_i = ptr_in_buf[1];

          temp_r1 = ptr_sel[0] * temp_r + ptr_sel[1] * temp_i;

          temp_i1 = ptr_sel[2] * temp_r + ptr_sel[3] * temp_i;

          ptr_in_buf -= 128;

          temp_r = ptr_in_buf[0];

          temp_i = ptr_in_buf[1];

          tmp_cr = temp_r1 + ptr_sel[4] * temp_r + ptr_sel[5] * temp_i;

          tmp_ci = temp_i1 + ptr_sel[6] * temp_r + ptr_sel[7] * temp_i;

          ptr_in_buf1 += 256;

          temp_r = ptr_in_buf1[0];

          temp_i = ptr_in_buf1[1];

          temp_r1 = ptr_sel1[0] * temp_r + ptr_sel1[1] * temp_i;

          temp_i1 = ptr_sel1[2] * temp_r + ptr_sel1[3] * temp_i;

          ptr_in_buf1 -= 128;

          temp_r = ptr_in_buf1[0];

          temp_i = ptr_in_buf1[1];

          tmp_vr = temp_r1 + ptr_sel1[4] * temp_r + ptr_sel1[5] * temp_i;

          tmp_vi = temp_i1 + ptr_sel1[6] * temp_r + ptr_sel1[7] * temp_i;

          tmp_cr *= 0.3984033437f;

          tmp_ci *= 0.3984033437f;

          tmp_vr *= 0.3984033437f;

          tmp_vi *= 0.3984033437f;

          base1 = base + tmp_vr * tmp_vr;

          base1 = base1 + tmp_vi * tmp_vi;

          mag_scaling_fac = (FLOAT32)(ixheaace_cbrt_calc((FLOAT32)base1));

          ptr_vec_x[2] = tmp_vr * mag_scaling_fac;

          ptr_vec_x[3] = tmp_vi * mag_scaling_fac;

          base1 = base + tmp_cr * tmp_cr;

          base1 = base1 + tmp_ci * tmp_ci;

          mag_scaling_fac = (FLOAT32)(ixheaace_cbrt_calc((FLOAT32)base1));

          ptr_vec_x_cap[2] = tmp_cr * mag_scaling_fac;

          ptr_vec_x_cap[3] = tmp_ci * mag_scaling_fac;

          ptr_in_buf += 256;

          ptr_in_buf1 += 256;

          ptr_vec_x += 4;

          ptr_vec_x_cap += 4;

        }

        ptr_vec_x = &vec_x[0];

        ptr_vec_x_cap = &vec_x_cap[0];

        temp_r = vec_x_cap[2 * (IXHEAACE_HBE_ZERO_BAND_IDX - 2)];

        temp_i = vec_x_cap[2 * (IXHEAACE_HBE_ZERO_BAND_IDX - 2) + 1];

        temp_r1 = vec_x[2 * (IXHEAACE_HBE_ZERO_BAND_IDX - 2)];

        temp_i1 = vec_x[2 * (IXHEAACE_HBE_ZERO_BAND_IDX - 2) + 1];

        x_zero_band_r = temp_r * temp_r - temp_i * temp_i;

        x_zero_band_i = temp_r * temp_i + temp_i * temp_r;

        temp_r = temp_r1 * temp_r1 - temp_i1 * temp_i1;

        temp_i = temp_r1 * temp_i1 + temp_i1 * temp_r1;

        k = 0;

        while (k < (IXHEAACE_HBE_OPER_BLK_LEN_3)) {

          temp_r1 = ptr_vec_x[0] * x_zero_band_r - ptr_vec_x[1] * x_zero_band_i;

          temp_i1 = ptr_vec_x[0] * x_zero_band_i + ptr_vec_x[1] * x_zero_band_r;

          temp_r1 += ptr_vec_x_cap[0] * temp_r - ptr_vec_x_cap[1] * temp_i;

          temp_i1 += ptr_vec_x_cap[0] * temp_i + ptr_vec_x_cap[1] * temp_r;

          ptr_out_buf[0] += (temp_r1 * 0.23570225f);

          ptr_out_buf[1] += (temp_i1 * 0.23570225f);

          ptr_out_buf += 128;

          ptr_vec_x += 2;

          ptr_vec_x_cap += 2;

          k++;

        }

        ptr_in_buf -= 128 * 11;

        ptr_in_buf1 -= 128 * 11;

        ptr_out_buf -= 128 * 6;

      }

    }

    ptr_out_buf -= (256 * qmf_voc_columns) - 2;

  }

}

VOID ixheaace_hbe_post_anal_prod4(ixheaace_str_esbr_hbe_txposer *pstr_hbe_txposer,

                                  WORD32 qmf_voc_columns, WORD32 qmf_band_idx) {

  WORD32 i, inp_band_idx;

  FLOAT32 *ptr_out = &pstr_hbe_txposer->qmf_out_buf[3][2 * qmf_band_idx];

  ixheaace_norm_qmf_in_buf_4(pstr_hbe_txposer, ((qmf_band_idx >> 1) - 1));

  for (; qmf_band_idx < pstr_hbe_txposer->x_over_qmf[3]; qmf_band_idx++) {

    WORD32 ip_idx;

    FLOAT32 temp, temp_r, temp_i;

    FLOAT32 *ptr_norm, *ptr_x_norm;

    inp_band_idx = qmf_band_idx >> 1;

    ip_idx = (qmf_band_idx & 1) ? (inp_band_idx + 1) : (inp_band_idx - 1);

    ptr_norm = &pstr_hbe_txposer->norm_qmf_in_buf[0][2 * ip_idx];

    ptr_x_norm = &pstr_hbe_txposer->norm_qmf_in_buf[IXHEAACE_HBE_ZERO_BAND_IDX][2 * inp_band_idx];

    i = 0;

    while (i < qmf_voc_columns) {

      WORD32 k;

      FLOAT32 x_zero_band_r, x_zero_band_i;

      temp_r = x_zero_band_r = *ptr_x_norm++;

      temp_i = x_zero_band_i = *ptr_x_norm++;

      temp = x_zero_band_r * x_zero_band_r - x_zero_band_i * x_zero_band_i;

      x_zero_band_i = x_zero_band_r * x_zero_band_i + x_zero_band_i * x_zero_band_r;

      x_zero_band_r = temp_r * temp - temp_i * x_zero_band_i;

      x_zero_band_i = temp_r * x_zero_band_i + temp_i * temp;

      for (k = 0; k < IXHEAACE_HBE_OPER_BLK_LEN_4; k++) {

        temp = *ptr_norm++;

        temp_i = *ptr_norm++;

        temp_r = temp * x_zero_band_r - temp_i * x_zero_band_i;

        temp_i = temp * x_zero_band_i + temp_i * x_zero_band_r;

        *ptr_out++ += (temp_r * 0.6666667f);

        *ptr_out++ += (temp_i * 0.6666667f);

        ptr_norm += 254;

        ptr_out += 126;

      }

      ptr_norm -= 128 * 11;

      ptr_out -= 128 * 4;

      ptr_x_norm += 126;

      i++;

    }

    ptr_out -= (128 * 2 * qmf_voc_columns) - 2;

  }

}