Bring xHE-AAC into pi-dev branch

bring the multi-commit integration from master to pi-dev

libxaac multi-arch cleanup

Change-Id: Ibcefa14f439e75f48a54955c9abf1a06c418e41e
Change-Id: Ia7a9b1e4de0add847c136f6f545b81dc8087521d
Change-Id: I12c3f8414dc9971017de223e88f292f8982a5c9b

Fix dependency error in Android.bp
Change-Id: Ic54f688736b3f2a70172676e4cee22aea4cbd705

Localized Android.bp
Change-Id: I68c4fc24fca279104c8ce2129fd4a3ed8d116b9b

Import xHE-AAC decoder from Ittiam
Change-Id: I3c8d124033f967b29d6e384cce5c843ee17a7bb1

Bug: 77287124
Test: build, cts DecoderTest

1 files changed, 720 insertions, 0 deletions

diff --git a/decoder/ixheaacd_lpc.c b/decoder/ixheaacd_lpc.c
new file mode 100644
index 0000000..82b1a74
--- /dev/null
+++ b/decoder/ixheaacd_lpc.c
@@ -0,0 +1,720 @@
+/******************************************************************************
+ *                                                                            *
+ * 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 <assert.h>
+#include <float.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+#include <string.h>
+
+#include <ixheaacd_type_def.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_sbr_common.h"
+#include "ixheaacd_drc_data_struct.h"
+#include "ixheaacd_drc_dec.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_func_def.h"
+#include "ixheaacd_windows.h"
+#include "ixheaacd_acelp_com.h"
+#include "ixheaacd_constants.h"
+#include <ixheaacd_basic_ops32.h>
+#include <ixheaacd_basic_ops40.h>
+
+#define LSF_GAP_F 50.0f
+#define FREQ_MAX_F 6400.0f
+#define FREQ_DIV_F 400.0f
+
+extern const FLOAT32 lsf_init[ORDER];
+
+extern const FLOAT32 ixheaacd_fir_lp_filt[1 + FILTER_DELAY];
+
+WORD32 ixheaacd_pow_10_i_by_128[128] = {
+    16384,     17788,     19312,     20968,     22765,     24716,     26835,
+    29135,     31632,     34343,     37287,     40483,     43953,     47720,
+    51810,     56251,     61072,     66307,     71990,     78161,     84860,
+    92134,     100030,    108604,    117913,    128019,    138992,    150905,
+    163840,    177882,    193129,    209682,    227654,    247167,    268352,
+    291353,    316325,    343438,    372874,    404834,    439532,    477205,
+    518107,    562515,    610728,    663075,    719908,    781612,    848605,
+    921340,    1000309,   1086046,   1179133,   1280197,   1389925,   1509057,
+    1638400,   1778829,   1931294,   2096827,   2276549,   2471675,   2683525,
+    2913532,   3163255,   3434381,   3728745,   4048340,   4395328,   4772057,
+    5181075,   5625151,   6107289,   6630752,   7199081,   7816122,   8486051,
+    9213400,   10003091,  10860467,  11791330,  12801978,  13899250,  15090570,
+    16384000,  17788290,  19312945,  20968279,  22765494,  24716750,  26835250,
+    29135329,  31632551,  34343813,  37287459,  40483409,  43953287,  47720573,
+    51810757,  56251515,  61072895,  66307521,  71990813,  78161226,  84860513,
+    92134002,  100030911, 108604672, 117913300, 128019781, 138992500, 150905703,
+    163840000, 177882909, 193129453, 209682794, 227654941, 247167501, 268352504,
+    291353298, 316325515, 343438130, 372874596, 404834095, 439532879, 477205734,
+    518107571, 562515151};
+
+VOID ixheaacd_lsf_weight_2st_flt(float *lsfq, float *w, WORD32 mode);
+
+static PLATFORM_INLINE WORD32 ixheaacd_mult32_m(WORD32 a, WORD32 b) {
+  WORD32 result;
+  WORD64 temp_result;
+
+  temp_result = (WORD64)a * (WORD64)b;
+  result = (WORD32)(temp_result >> 31);
+
+  return (result);
+}
+
+void ixheaacd_reset_acelp_data_fix(ia_usac_data_struct *usac_data,
+                                   ia_usac_lpd_decoder_handle st,
+                                   WORD32 *ptr_overlap_buf,
+                                   WORD32 was_last_short, WORD32 tw_mdct) {
+  WORD32 i;
+
+  if (was_last_short == 1) {
+    st->mode_prev = -2;
+  } else {
+    st->mode_prev = -1;
+  }
+
+  for (i = 0; i < NUM_SUBFR_SUPERFRAME_BY2 - 1; i++) {
+    st->pitch_prev[i] = 64;
+    st->gain_prev[i] = 0;
+  }
+
+  st->bpf_active_prev = 0;
+
+  if (ptr_overlap_buf != NULL && !tw_mdct) {
+    const WORD32 *ptr_window_coeff;
+    WORD32 fac_length;
+    if (was_last_short) {
+      fac_length = (usac_data->ccfl) / 16;
+    } else {
+      fac_length = (usac_data->len_subfrm) / 2;
+    }
+
+    if (fac_length == 48) {
+      ptr_window_coeff = ixheaacd_sine_win_96;
+    } else if (fac_length == 64) {
+      ptr_window_coeff = ixheaacd_sine_win_128;
+    } else if (fac_length == 96) {
+      ptr_window_coeff = ixheaacd_sine_win_192;
+    } else {
+      ptr_window_coeff = ixheaacd_sine_win_256;
+    }
+
+    for (i = 0; i < 2 * fac_length; i++) {
+      ptr_overlap_buf[(usac_data->ccfl) / 2 - fac_length + i] =
+          ixheaacd_mult32_m(
+              ptr_overlap_buf[(usac_data->ccfl) / 2 - fac_length + i],
+              ptr_window_coeff[2 * fac_length - 1 - i]);
+    }
+    for (i = 0; i < (usac_data->ccfl) / 2 - fac_length; i++) {
+      ptr_overlap_buf[(usac_data->ccfl) / 2 + fac_length + i] = 0;
+    }
+  }
+
+  return;
+}
+
+VOID ixheaacd_fix2flt_data(ia_usac_data_struct *usac_data,
+                           ia_usac_lpd_decoder_handle st, WORD32 k) {
+  WORD32 i;
+  WORD32 fac_length;
+  WORD32 window_sequence_last = usac_data->window_sequence_last[k];
+  WORD32 *p_ola_buffer = usac_data->overlap_data_ptr[k];
+  if (window_sequence_last == EIGHT_SHORT_SEQUENCE) {
+    fac_length = (usac_data->ccfl) / 16;
+  } else {
+    fac_length = (usac_data->len_subfrm) / 2;
+  }
+
+  ixheaacd_memset(st->lp_flt_coeff_a_prev, 2 * (ORDER + 1));
+  ixheaacd_memset(st->exc_prev, 1 + (2 * FAC_LENGTH));
+  ixheaacd_memset(st->xcitation_prev, MAX_PITCH + INTER_LP_FIL_ORDER + 1);
+  ixheaacd_memset(st->synth_prev, MAX_PITCH + SYNTH_DELAY_LMAX);
+  ixheaacd_memset(st->bpf_prev, FILTER_DELAY + LEN_SUBFR);
+
+  st->gain_threshold = 0.0f;
+
+  if (p_ola_buffer != NULL) {
+    for (i = 0; i < (usac_data->len_subfrm) / 2 - fac_length; i++) {
+      st->exc_prev[i] = 0;
+    }
+    for (i = 0; i < 2 * fac_length + 1; i++) {
+      st->exc_prev[(usac_data->len_subfrm) / 2 - fac_length + i] = (FLOAT32)(
+          p_ola_buffer[i + usac_data->ccfl / 2 - fac_length - 1] / 16384.0);
+    }
+  } else {
+    ixheaacd_memset(st->exc_prev, 1 + (2 * FAC_LENGTH));
+  }
+
+  return;
+}
+
+void ixheaacd_init_acelp_data(ia_usac_data_struct *usac_data,
+                              ia_usac_lpd_decoder_handle st) {
+  ixheaacd_reset_acelp_data_fix(usac_data, st, NULL, 0, 0);
+}
+
+#define PI_BY_6400 (PI / 6400.0)
+#define SCALE1 (6400.0 / PI)
+
+void ixheaacd_lsp_2_lsf_conversion(float lsp[], float lsf[], WORD32 m) {
+  short i;
+  for (i = 0; i < m; i++) {
+    lsf[i] = (float)(acos(lsp[i]) * SCALE1);
+  }
+  return;
+}
+
+static VOID ixheaacd_lsf_2_lsp_conversion_float(FLOAT32 lsf[], FLOAT32 lsp[],
+                                                WORD32 m) {
+  WORD32 i;
+  for (i = 0; i < m; i++)
+    lsp[i] = (FLOAT32)cos((double)lsf[i] * (double)PI_BY_6400);
+
+  return;
+}
+
+static VOID ixheaacd_bass_post_filter(FLOAT32 *synth_sig, WORD32 *pitch,
+                                      FLOAT32 *pitch_gain, FLOAT32 *synth_out,
+                                      WORD32 len_fr, WORD32 len2,
+                                      FLOAT32 bpf_prev[]) {
+  WORD32 i, j, sf, num_subfr, pitch_lag, lg;
+  FLOAT32 x_energy, xy_corr, y_energy, norm_corr, energy, gain, tmp, alpha;
+  FLOAT32 noise_buf[FILTER_DELAY + (2 * LEN_SUBFR)], *noise_tmp1, *noise_tmp2,
+      *x, *y;
+
+  noise_tmp1 = noise_buf + FILTER_DELAY;
+  noise_tmp2 = noise_buf + FILTER_DELAY + LEN_SUBFR;
+
+  memcpy(synth_out, synth_sig - LEN_SUBFR, len_fr * sizeof(FLOAT32));
+
+  if (len_fr % 64)
+    memset(synth_out + len_fr, 0, (LEN_SUBFR - len_fr % 64) * sizeof(FLOAT32));
+
+  sf = 0;
+  for (num_subfr = 0; num_subfr < len_fr; num_subfr += LEN_SUBFR, sf++) {
+    pitch_lag = pitch[sf];
+    gain = pitch_gain[sf];
+
+    if (gain > 1.0f) gain = 1.0f;
+    if (gain < 0.0f) gain = 0.0f;
+
+    x = &synth_sig[num_subfr - 96];
+    y = &synth_sig[num_subfr - pitch_lag / 2 - 96];
+
+    x_energy = 0.01f;
+    xy_corr = 0.01f;
+    y_energy = 0.01f;
+    for (i = 0; i < LEN_SUBFR + 96; i++) {
+      x_energy += x[i] * x[i];
+      xy_corr += x[i] * y[i];
+      y_energy += y[i] * y[i];
+    }
+
+    norm_corr = xy_corr / (FLOAT32)sqrt(x_energy * y_energy);
+
+    if (norm_corr > 0.95f) pitch_lag >>= 1;
+
+    lg = len_fr + len2 - pitch_lag - num_subfr;
+    if (lg < 0) lg = 0;
+    if (lg > LEN_SUBFR) lg = LEN_SUBFR;
+
+    if (gain > 0) {
+      if (lg > 0) {
+        tmp = 0.01f;
+        for (i = 0; i < lg; i++) {
+          tmp += synth_sig[i + num_subfr] * synth_sig[i + num_subfr];
+        }
+        energy = 0.01f;
+        for (i = 0; i < lg; i++) {
+          energy += synth_sig[i + num_subfr + pitch_lag] *
+                    synth_sig[i + num_subfr + pitch_lag];
+        }
+        tmp = (FLOAT32)sqrt(tmp / energy);
+        if (tmp < gain) gain = tmp;
+      }
+
+      alpha = 0.5f * gain;
+      for (i = 0; i < lg; i++) {
+        noise_tmp2[i] = alpha * (synth_sig[i + num_subfr] -
+                                 0.5f * synth_sig[i + num_subfr - pitch_lag] -
+                                 0.5f * synth_sig[i + num_subfr + pitch_lag]);
+      }
+      for (i = lg; i < LEN_SUBFR; i++) {
+        noise_tmp2[i] = alpha * (synth_sig[i + num_subfr] -
+                                 synth_sig[i + num_subfr - pitch_lag]);
+      }
+    } else {
+      memset(noise_tmp2, 0, LEN_SUBFR * sizeof(FLOAT32));
+    }
+
+    memcpy(noise_buf, bpf_prev, (FILTER_DELAY + LEN_SUBFR) * sizeof(FLOAT32));
+    memcpy(bpf_prev, noise_buf + LEN_SUBFR,
+           (FILTER_DELAY + LEN_SUBFR) * sizeof(FLOAT32));
+
+    for (i = 0; i < LEN_SUBFR; i++) {
+      tmp = ixheaacd_fir_lp_filt[0] * noise_tmp1[i];
+      for (j = 1; j <= FILTER_DELAY; j++) {
+        tmp +=
+            ixheaacd_fir_lp_filt[j] * (noise_tmp1[i - j] + noise_tmp1[i + j]);
+      }
+      synth_out[i + num_subfr] -= tmp;
+    }
+  }
+
+  return;
+}
+
+void ixheaacd_reorder_lsf(float *lsf, float min_dist, int n) {
+  int i;
+  float lsf_min;
+
+  lsf_min = min_dist;
+  for (i = 0; i < n; i++) {
+    if (lsf[i] < lsf_min) lsf[i] = lsf_min;
+
+    lsf_min = lsf[i] + min_dist;
+  }
+
+  lsf_min = FREQ_MAX_F - min_dist;
+  for (i = n - 1; i >= 0; i--) {
+    if (lsf[i] > lsf_min) lsf[i] = lsf_min;
+
+    lsf_min = lsf[i] - min_dist;
+  }
+
+  return;
+}
+
+WORD32 ixheaacd_lpd_dec(ia_usac_data_struct *usac_data,
+                        ia_usac_lpd_decoder_handle st,
+                        ia_td_frame_data_struct *pstr_td_frame_data,
+                        FLOAT32 fsynth[], WORD32 first_lpd_flag,
+                        WORD32 short_fac_flag, WORD32 bpf_control_info) {
+  FLOAT32 *synth_buf = usac_data->synth_buf;
+  FLOAT32 *xcitation_buff = usac_data->exc_buf;
+  FLOAT32 lsp_curr[ORDER];
+  FLOAT32 lsf_curr[ORDER];
+  FLOAT32 *lp_flt_coff_a = usac_data->lp_flt_coff;
+  FLOAT32 *synth, *xcitation_curr;
+  WORD32 *pitch = usac_data->pitch;
+  FLOAT32 *pitch_gain = usac_data->pitch_gain;
+  FLOAT32 lsf_flt[(2 * NUM_FRAMES + 1) * ORDER];
+
+  WORD32 i, k, tp, mode;
+  WORD32 *mod;
+  FLOAT32 gain, stability_factor;
+  FLOAT32 tmp, synth_corr, synth_energy;
+
+  WORD32 len_fr;
+  WORD32 len_subfrm;
+  WORD32 num_subfr;
+  WORD32 num_subfr_in_superfr;
+  WORD32 num_subfr_by2;
+  WORD32 synth_delay;
+  WORD32 num_samples = 0;
+
+  WORD32 *ptr_scratch = &usac_data->scratch_buffer[0];
+
+  WORD32 subfr_len, n_subfr;
+  WORD32 err = 0;
+
+  len_fr = usac_data->ccfl;
+  len_subfrm = usac_data->len_subfrm;
+  num_subfr = usac_data->num_subfrm;
+  num_subfr_in_superfr = NUM_FRAMES * num_subfr;
+  num_subfr_by2 = (num_subfr_in_superfr / 2) - 1;
+  synth_delay = num_subfr_by2 * LEN_SUBFR;
+
+  synth = synth_buf + MAX_PITCH + synth_delay;
+  ixheaacd_mem_cpy(st->synth_prev, synth_buf, MAX_PITCH + synth_delay);
+  ixheaacd_memset(synth, SYNTH_DELAY_LMAX + LEN_SUPERFRAME - synth_delay);
+
+  xcitation_curr = xcitation_buff + MAX_PITCH + INTER_LP_FIL_ORDER + 1;
+  ixheaacd_mem_cpy(st->xcitation_prev, xcitation_buff,
+                   MAX_PITCH + INTER_LP_FIL_ORDER + 1);
+  memset(xcitation_curr, 0, sizeof(FLOAT32) * (LEN_SUPERFRAME + 1));
+
+  mod = pstr_td_frame_data->mod;
+
+  for (i = 0; i < num_subfr_by2; i++) {
+    pitch[i] = st->pitch_prev[i];
+    pitch_gain[i] = st->gain_prev[i];
+  }
+  for (i = 0; i < num_subfr_in_superfr; i++) {
+    pitch[i + num_subfr_by2] = 64;
+    pitch_gain[i + num_subfr_by2] = 0.0f;
+  }
+  if (!first_lpd_flag) {
+    ixheaacd_lsp_2_lsf_conversion(st->lspold, lsf_flt, ORDER);
+  }
+
+  ixheaacd_alg_vec_dequant(pstr_td_frame_data, first_lpd_flag, lsf_flt,
+                           pstr_td_frame_data->mod);
+
+  if (first_lpd_flag) {
+    ixheaacd_mem_cpy(&lsf_flt[0], st->lsf_prev, ORDER);
+    ixheaacd_lsf_2_lsp_conversion_float(st->lsf_prev, st->lspold, ORDER);
+  }
+
+  if ((first_lpd_flag && mod[0] == 0) || (first_lpd_flag && mod[1] == 0) ||
+      ((first_lpd_flag && mod[2] == 0 && len_subfrm != LEN_FRAME))) {
+    FLOAT32 lp_flt_coeff_a[9 * (ORDER + 1)];
+    FLOAT32 tmp_buf[3 * LEN_FRAME + ORDER];
+    FLOAT32 tmp_res_buf[3 * LEN_FRAME];
+    FLOAT32 *tmp = &(tmp_buf[LEN_FRAME]);
+    FLOAT32 *ptr_tmp = &(tmp_res_buf[LEN_FRAME]);
+    WORD32 tmp_start;
+    FLOAT32 mem = 0;
+    WORD32 gain;
+    WORD32 length;
+
+    ixheaacd_interpolation_lsp_params(st->lspold, st->lspold, lp_flt_coeff_a,
+                                      8);
+
+    memcpy(st->lp_flt_coeff_a_prev, lp_flt_coeff_a,
+           (ORDER + 1) * sizeof(FLOAT32));
+    memcpy(st->lp_flt_coeff_a_prev + ORDER + 1, lp_flt_coeff_a,
+           (ORDER + 1) * sizeof(FLOAT32));
+
+    if (mod[0] == 0) {
+      WORD32 fac_length;
+      if (short_fac_flag) {
+        fac_length = (len_subfrm * NUM_FRAMES) / 16;
+      } else {
+        fac_length = len_subfrm / 2;
+      }
+
+      gain = ixheaacd_pow_10_i_by_128[pstr_td_frame_data->fac_data[0]];
+
+      memcpy(ptr_scratch, &pstr_td_frame_data->fac_data[0],
+             129 * sizeof(WORD32));
+
+      for (i = 0; i < 64; i++) {
+        pstr_td_frame_data->fac_data[i] = ptr_scratch[2 * i + 1] << 16;
+        pstr_td_frame_data->fac_data[64 + i] = ptr_scratch[fac_length - 2 * i]
+                                               << 16;
+      }
+
+      err = ixheaacd_fwd_alias_cancel_tool(usac_data, pstr_td_frame_data,
+                                           fac_length, lp_flt_coeff_a, gain);
+      if (err == -1) return err;
+
+      memset(
+          &usac_data->overlap_data_ptr[usac_data->present_chan][(len_fr / 2)],
+          0, fac_length * sizeof(WORD32));
+    }
+
+    if (mod[0] == 0 && len_subfrm != LEN_FRAME) {
+      for (i = 0; i < 3 * len_subfrm; i++)
+        st->fd_synth[ORDER - len_subfrm + i] = (FLOAT32)(
+            (FLOAT32)usac_data
+                ->overlap_data_ptr[usac_data->present_chan][i - len_subfrm] /
+            16384.0);
+      num_samples = min(3 * len_subfrm, MAX_PITCH + synth_delay);
+    } else {
+      for (i = 0; i < 2 * len_subfrm; i++)
+        st->fd_synth[ORDER + i] = (FLOAT32)(
+            (FLOAT32)usac_data->overlap_data_ptr[usac_data->present_chan][i] /
+            16384.0);
+      num_samples = min(2 * len_subfrm, MAX_PITCH + synth_delay);
+    }
+    ixheaacd_mem_cpy(st->fd_synth + ORDER, synth - 2 * len_subfrm,
+                     2 * len_subfrm);
+    if (mod[0] == 0 && len_subfrm != LEN_FRAME) {
+      ixheaacd_preemphsis_tool_float(st->fd_synth + ORDER - len_subfrm,
+                                     PREEMPH_FILT_FAC, 3 * len_subfrm, mem);
+    } else {
+      ixheaacd_preemphsis_tool_float(st->fd_synth + ORDER, PREEMPH_FILT_FAC,
+                                     2 * len_subfrm, mem);
+    }
+
+    if (mod[0] == 0 && len_subfrm != LEN_FRAME) {
+      ixheaacd_memset(tmp - len_subfrm, ORDER);
+      ixheaacd_mem_cpy(st->fd_synth + ORDER - len_subfrm,
+                       tmp - len_subfrm + ORDER, 3 * len_subfrm);
+      tmp_start = -len_subfrm;
+    } else {
+      ixheaacd_memset(tmp, ORDER);
+      ixheaacd_mem_cpy(st->fd_synth + ORDER, tmp + ORDER, 2 * len_subfrm);
+      tmp_start = 0;
+    }
+    ixheaacd_memset(ptr_tmp - len_subfrm, 3 * len_subfrm);
+    memset(st->fd_synth, 0, ORDER * sizeof(WORD32));
+    length = (2 * len_subfrm - tmp_start) / LEN_SUBFR;
+
+    ixheaacd_residual_tool_float1(lp_flt_coeff_a,
+                                  &st->fd_synth[ORDER + tmp_start],
+                                  &ptr_tmp[tmp_start], LEN_SUBFR, length);
+
+    if (mod[0] != 0 && (len_subfrm == LEN_FRAME || mod[1] != 0)) {
+      num_samples = min(len_subfrm, MAX_PITCH + INTER_LP_FIL_ORDER + 1);
+    } else if (mod[0] == 0 && len_subfrm != LEN_FRAME) {
+      num_samples = min(3 * len_subfrm, MAX_PITCH + INTER_LP_FIL_ORDER + 1);
+    } else {
+      num_samples = min(2 * len_subfrm, MAX_PITCH + INTER_LP_FIL_ORDER + 1);
+    }
+    ixheaacd_mem_cpy(ptr_tmp + 2 * len_subfrm - num_samples,
+                     xcitation_curr - num_samples, num_samples);
+  }
+
+  k = 0;
+
+  while (k < 4) {
+    mode = mod[k];
+    if ((st->mode_prev == 0) && (mode > 0) &&
+        (k != 0 || st->bpf_active_prev == 1)) {
+      i = (k * num_subfr) + num_subfr_by2;
+      pitch[i + 1] = pitch[i] = pitch[i - 1];
+      pitch_gain[i + 1] = pitch_gain[i] = pitch_gain[i - 1];
+    }
+
+    if ((mode == 0) || (mode == 1))
+      memcpy(lsf_curr, &lsf_flt[(k + 1) * ORDER], ORDER * sizeof(FLOAT32));
+    else if (mode == 2)
+      memcpy(lsf_curr, &lsf_flt[(k + 2) * ORDER], ORDER * sizeof(FLOAT32));
+    else
+      memcpy(lsf_curr, &lsf_flt[(k + 4) * ORDER], ORDER * sizeof(FLOAT32));
+
+    ixheaacd_lsf_2_lsp_conversion_float(lsf_curr, lsp_curr, ORDER);
+
+    tmp = 0.0f;
+    for (i = 0; i < ORDER; i++) {
+      tmp += (lsf_curr[i] - st->lsf_prev[i]) * (lsf_curr[i] - st->lsf_prev[i]);
+    }
+    stability_factor = (FLOAT32)(1.25f - (tmp / 400000.0f));
+    if (stability_factor > 1.0f) {
+      stability_factor = 1.0f;
+    }
+    if (stability_factor < 0.0f) {
+      stability_factor = 0.0f;
+    }
+
+    if (mode == 0) {
+      ixheaacd_interpolation_lsp_params(st->lspold, lsp_curr, lp_flt_coff_a,
+                                        num_subfr);
+
+      ixheaacd_acelp_alias_cnx(usac_data, pstr_td_frame_data, k, lp_flt_coff_a,
+                               stability_factor, st);
+
+      if ((st->mode_prev != 0) && bpf_control_info) {
+        i = (k * num_subfr) + num_subfr_by2;
+        pitch[i - 1] = pitch[i];
+        pitch_gain[i - 1] = pitch_gain[i];
+        if (st->mode_prev != -2) {
+          pitch[i - 2] = pitch[i];
+          pitch_gain[i - 2] = pitch_gain[i];
+        }
+      }
+      k++;
+    } else {
+      if (mode == 1) {
+        subfr_len = len_subfrm;
+        n_subfr = num_subfr;
+      } else if (mode == 2) {
+        subfr_len = len_subfrm << 1;
+        n_subfr = num_subfr_in_superfr / 2;
+      } else if (mode == 3) {
+        subfr_len = len_subfrm << 2;
+        n_subfr = num_subfr_in_superfr;
+      }
+
+      ixheaacd_lpc_coef_gen(st->lspold, lsp_curr, lp_flt_coff_a, n_subfr,
+                            ORDER);
+
+      ixheaacd_tcx_mdct(usac_data, pstr_td_frame_data, k, lp_flt_coff_a,
+                        subfr_len, st);
+      k += (1 << (mode - 1));
+    }
+
+    st->mode_prev = mode;
+
+    ixheaacd_mem_cpy(lsp_curr, st->lspold, ORDER);
+    ixheaacd_mem_cpy(lsf_curr, st->lsf_prev, ORDER);
+  }
+
+  ixheaacd_mem_cpy(xcitation_buff + len_fr, st->xcitation_prev,
+                   MAX_PITCH + INTER_LP_FIL_ORDER + 1);
+
+  ixheaacd_mem_cpy(synth_buf + len_fr, st->synth_prev, MAX_PITCH + synth_delay);
+
+  if (!bpf_control_info) {
+    if (mod[0] != 0 && st->bpf_active_prev) {
+      for (i = 2; i < num_subfr_in_superfr; i++)
+        pitch_gain[num_subfr_by2 + i] = 0.0;
+    } else {
+      for (i = 0; i < num_subfr_in_superfr; i++)
+        pitch_gain[num_subfr_by2 + i] = 0.0;
+    }
+  }
+  st->bpf_active_prev = bpf_control_info;
+
+  for (i = 0; i < num_subfr_by2; i++) {
+    st->pitch_prev[i] = pitch[num_subfr_in_superfr + i];
+    st->gain_prev[i] = pitch_gain[num_subfr_in_superfr + i];
+  }
+
+  synth = synth_buf + MAX_PITCH;
+
+  for (i = 0; i < num_subfr_in_superfr; i++) {
+    tp = pitch[i];
+    gain = pitch_gain[i];
+    if (gain > 0.0f) {
+      synth_corr = 0.0f, synth_energy = 1e-6f;
+      for (k = 0; k < LEN_SUBFR; k++) {
+        synth_corr +=
+            synth[i * LEN_SUBFR + k] * synth[(i * LEN_SUBFR) - tp + k];
+        synth_energy +=
+            synth[(i * LEN_SUBFR) - tp + k] * synth[(i * LEN_SUBFR) - tp + k];
+      }
+      pitch_gain[i] = synth_corr / synth_energy;
+    }
+  }
+
+  if (mod[3] == 0) {
+    ixheaacd_bass_post_filter(synth, pitch, pitch_gain, fsynth, len_fr,
+                              synth_delay, st->bpf_prev);
+  } else {
+    ixheaacd_bass_post_filter(synth, pitch, pitch_gain, fsynth, len_fr,
+                              synth_delay - (len_subfrm / 2), st->bpf_prev);
+  }
+  return err;
+}
+
+WORD32 ixheaacd_lpd_dec_update(ia_usac_lpd_decoder_handle tddec,
+                               ia_usac_data_struct *usac_data, WORD32 i_ch) {
+  WORD32 err = 0, i, k;
+
+  WORD32 *ptr_overlap = &usac_data->overlap_data_ptr[i_ch][0];
+  WORD32 len_fr, lpd_sbf_len, lpd_delay, num_subfr_by2, synth_delay, fac_length;
+
+  if (usac_data->tw_mdct[0])
+    ptr_overlap = &usac_data->overlap_data_ptr[i_ch][usac_data->ccfl / 2];
+
+  len_fr = usac_data->ccfl;
+  lpd_sbf_len = (NUM_FRAMES * usac_data->num_subfrm) / 2;
+  lpd_delay = lpd_sbf_len * LEN_SUBFR;
+  num_subfr_by2 = lpd_sbf_len - 1;
+  synth_delay = num_subfr_by2 * LEN_SUBFR;
+  fac_length = (usac_data->len_subfrm) / 2;
+
+  for (i = 0; i < LEN_SUBFR + synth_delay; i++)
+    ptr_overlap[i] = (WORD32)(
+        (FLOAT32)tddec->synth_prev[MAX_PITCH - (LEN_SUBFR) + i] * 16384.0);
+
+  ptr_overlap += LEN_SUBFR + synth_delay - fac_length;
+
+  for (k = 0; k < 2 * fac_length; k++)
+    ptr_overlap[k] = (WORD32)((FLOAT32)tddec->exc_prev[k + 1] * 16384.0);
+
+  ptr_overlap = &usac_data->overlap_data_ptr[i_ch][lpd_delay + fac_length];
+
+  for (i = 0; i < len_fr - lpd_delay - fac_length; i++) ptr_overlap[i] = 0;
+
+  usac_data->window_shape[i_ch] = WIN_SEL_0;
+  usac_data->window_sequence_last[i_ch] = EIGHT_SHORT_SEQUENCE;
+  usac_data->td_frame_prev[i_ch] = 1;
+
+  if (tddec->mode_prev == 0) {
+    memmove(usac_data->lpc_prev[i_ch], &tddec->lp_flt_coeff_a_prev[ORDER + 1],
+            (ORDER + 1) * sizeof(FLOAT32));
+    memmove(usac_data->acelp_in[i_ch], tddec->exc_prev,
+            (1 + (2 * FAC_LENGTH)) * sizeof(FLOAT32));
+  }
+
+  return err;
+}
+
+void ixheaacd_lpd_bpf_fix(ia_usac_data_struct *usac_data, WORD32 is_short_flag,
+                          FLOAT32 out_buffer[], ia_usac_lpd_decoder_handle st) {
+  WORD32 i, tp, k;
+  float synth_buf[MAX_PITCH + SYNTH_DELAY_LMAX + LEN_SUPERFRAME];
+  float signal_out[LEN_SUPERFRAME];
+  float *synth, synth_corr, synth_energy;
+  WORD32 pitch[NUM_SUBFR_SUPERFRAME_BY2 + 3];
+  float pitch_gain[NUM_SUBFR_SUPERFRAME_BY2 + 3];
+  WORD32 len_fr, lpd_sbf_len, lpd_delay, num_subfr_by2, synth_delay, fac_length;
+
+  len_fr = usac_data->ccfl;
+  lpd_sbf_len = (NUM_FRAMES * usac_data->num_subfrm) / 2;
+  lpd_delay = lpd_sbf_len * LEN_SUBFR;
+  num_subfr_by2 = lpd_sbf_len - 1;
+  synth_delay = num_subfr_by2 * LEN_SUBFR;
+  fac_length = (usac_data->len_subfrm) / 2;
+
+  ixheaacd_memset(synth_buf, MAX_PITCH + synth_delay + len_fr);
+  synth = synth_buf + MAX_PITCH + synth_delay;
+  ixheaacd_mem_cpy(st->synth_prev, synth_buf, MAX_PITCH + synth_delay);
+  ixheaacd_mem_cpy(out_buffer, synth_buf + MAX_PITCH - (LEN_SUBFR),
+                   synth_delay + len_fr + (LEN_SUBFR));
+
+  for (i = 0; i < num_subfr_by2; i++) {
+    pitch[i] = st->pitch_prev[i];
+    pitch_gain[i] = st->gain_prev[i];
+  }
+  for (i = num_subfr_by2; i < lpd_sbf_len + 3; i++) {
+    pitch[i] = 64;
+    pitch_gain[i] = 0.0f;
+  }
+  if (st->mode_prev == 0) {
+    pitch[num_subfr_by2] = pitch[num_subfr_by2 - 1];
+    pitch_gain[num_subfr_by2] = pitch_gain[num_subfr_by2 - 1];
+    if (!is_short_flag) {
+      pitch[num_subfr_by2 + 1] = pitch[num_subfr_by2];
+      pitch_gain[num_subfr_by2 + 1] = pitch_gain[num_subfr_by2];
+    }
+  }
+
+  synth = synth_buf + MAX_PITCH;
+
+  for (i = 0; i < num_subfr_by2 + 2; i++) {
+    tp = pitch[i];
+    if (pitch_gain[i] > 0.0f) {
+      synth_corr = 0.0f, synth_energy = 1e-6f;
+      for (k = 0; k < LEN_SUBFR; k++) {
+        synth_corr +=
+            synth[i * LEN_SUBFR + k] * synth[(i * LEN_SUBFR) - tp + k];
+        synth_energy +=
+            synth[(i * LEN_SUBFR) - tp + k] * synth[(i * LEN_SUBFR) - tp + k];
+      }
+      pitch_gain[i] = synth_corr / synth_energy;
+    }
+  }
+
+  ixheaacd_bass_post_filter(synth, pitch, pitch_gain, signal_out,
+                            (lpd_sbf_len + 2) * LEN_SUBFR + LEN_SUBFR,
+                            len_fr - (lpd_sbf_len + 2) * LEN_SUBFR,
+                            st->bpf_prev);
+
+  ixheaacd_mem_cpy(signal_out, out_buffer,
+                   (lpd_sbf_len + 2) * LEN_SUBFR + LEN_SUBFR);
+  return;
+}