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android13/external/libxaac/decoder/ixheaacd_acelp_decode.c

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/******************************************************************************
* *
* 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 <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_td_mdct.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_acelp_com.h"
#define F_PIT_SHARP 0.85F
#define MEAN_ENER 30
extern const FLOAT32 ixheaacd_interpol_filt[INTER_LP_FIL_LEN];
VOID ixheaacd_acelp_pitch_sharpening(FLOAT32 *x, WORD32 pit_lag) {
WORD32 i;
for (i = pit_lag; i < LEN_SUBFR; i++) {
x[i] += x[i - pit_lag] * F_PIT_SHARP;
}
return;
}
static VOID ixheaacd_acelp_decode_1sp_per_track(WORD32 idx_1p, WORD32 M,
WORD32 ixheaacd_drc_offset,
WORD32 track,
FLOAT32 code_vec[]) {
WORD32 sign_index, mask, m;
WORD32 sp_pos;
mask = ((1 << M) - 1);
sp_pos = (idx_1p & mask) + ixheaacd_drc_offset;
sign_index = ((idx_1p >> M) & 1);
m = (sp_pos << 2) + track;
if (sign_index == 1)
code_vec[m] = (code_vec[m] - 1.0f);
else
code_vec[m] = (code_vec[m] + 1.0f);
return;
}
static VOID ixheaacd_acelp_decode_2sp_per_track(WORD32 idx_2p, WORD32 M,
WORD32 ixheaacd_drc_offset,
WORD32 track,
FLOAT32 code_vec[]) {
WORD32 sign_index;
WORD32 mask, m0, m1;
WORD32 sp_pos[2];
mask = ((1 << M) - 1);
sp_pos[0] = (((idx_2p >> M) & mask) + ixheaacd_drc_offset);
sp_pos[1] = ((idx_2p & mask) + ixheaacd_drc_offset);
sign_index = (idx_2p >> 2 * M) & 1;
m0 = (sp_pos[0] << 2) + track;
m1 = (sp_pos[1] << 2) + track;
if ((sp_pos[1] - sp_pos[0]) < 0) {
if (sign_index == 1) {
code_vec[m0] = (code_vec[m0] - 1.0f);
code_vec[m1] = (code_vec[m1] + 1.0f);
} else {
code_vec[m0] = (code_vec[m0] + 1.0f);
code_vec[m1] = (code_vec[m1] - 1.0f);
}
} else {
if (sign_index == 1) {
code_vec[m0] = (code_vec[m0] - 1.0f);
code_vec[m1] = (code_vec[m1] - 1.0f);
} else {
code_vec[m0] = (code_vec[m0] + 1.0f);
code_vec[m1] = (code_vec[m1] + 1.0f);
}
}
return;
}
static VOID ixheaacd_acelp_decode_3sp_per_track(WORD32 idx_3p, WORD32 M,
WORD32 ixheaacd_drc_offset,
WORD32 track,
FLOAT32 code_vec[]) {
WORD32 j, mask, idx_2p, idx_1p;
mask = ((1 << (2 * M - 1)) - 1);
idx_2p = idx_3p & mask;
j = ixheaacd_drc_offset;
if (((idx_3p >> ((2 * M) - 1)) & 1) == 1) {
j += (1 << (M - 1));
}
ixheaacd_acelp_decode_2sp_per_track(idx_2p, M - 1, j, track, code_vec);
mask = ((1 << (M + 1)) - 1);
idx_1p = (idx_3p >> 2 * M) & mask;
ixheaacd_acelp_decode_1sp_per_track(idx_1p, M, ixheaacd_drc_offset, track,
code_vec);
return;
}
static VOID ixheaacd_d_acelp_decode_4sp_per_track_section(
WORD32 index, WORD32 ixheaacd_drc_offset, WORD32 track,
FLOAT32 code_vec[]) {
WORD32 j, idx_2p;
idx_2p = index & 31;
j = ixheaacd_drc_offset;
if (((index >> 5) & 1) == 1) {
j += 4;
}
ixheaacd_acelp_decode_2sp_per_track(idx_2p, 2, j, track, code_vec);
idx_2p = (index >> 6) & 127;
ixheaacd_acelp_decode_2sp_per_track(idx_2p, 3, ixheaacd_drc_offset, track,
code_vec);
return;
}
static VOID ixheaacd_acelp_decode_4sp_per_track(WORD32 idx_4p, WORD32 track,
FLOAT32 code_vec[]) {
WORD32 idx_1p, idx_2p, idx_3p;
switch ((idx_4p >> 14) & 3) {
case 0:
if (((idx_4p >> 13) & 1) == 0)
ixheaacd_d_acelp_decode_4sp_per_track_section(idx_4p, 0, track,
code_vec);
else
ixheaacd_d_acelp_decode_4sp_per_track_section(idx_4p, 8, track,
code_vec);
break;
case 1:
idx_1p = idx_4p >> 10;
ixheaacd_acelp_decode_1sp_per_track(idx_1p, 3, 0, track, code_vec);
ixheaacd_acelp_decode_3sp_per_track(idx_4p, 3, 8, track, code_vec);
break;
case 2:
idx_2p = idx_4p >> 7;
ixheaacd_acelp_decode_2sp_per_track(idx_2p, 3, 0, track, code_vec);
ixheaacd_acelp_decode_2sp_per_track(idx_4p, 3, 8, track, code_vec);
break;
case 3:
idx_3p = idx_4p >> 4;
ixheaacd_acelp_decode_3sp_per_track(idx_3p, 3, 0, track, code_vec);
ixheaacd_acelp_decode_1sp_per_track(idx_4p, 3, 8, track, code_vec);
break;
}
return;
}
static VOID ixheaacd_d_acelp_add_pulse(WORD32 pos[], WORD32 nb_pulse,
WORD32 track, FLOAT32 code[]) {
WORD32 i, k;
for (k = 0; k < nb_pulse; k++) {
i = ((pos[k] & (16 - 1)) << 2) + track;
if ((pos[k] & 16) == 0) {
code[i] = (WORD16)(code[i] + 1.0f);
} else {
code[i] = (WORD16)(code[i] - 1.0f);
}
}
return;
}
static VOID ixheaacd_d_acelp_decode_1p_n1(WORD32 index, WORD32 N,
WORD32 ixheaacd_drc_offset,
WORD32 pos[]) {
WORD32 i, pos1, mask;
mask = ((1 << N) - 1);
pos1 = ((index & mask) + ixheaacd_drc_offset);
i = ((index >> N) & 1);
if (i == 1) {
pos1 += 16;
}
pos[0] = pos1;
return;
}
VOID ixheaacd_acelp_decode_pulses_per_track(WORD32 cb_index[],
const WORD16 code_bits,
FLOAT32 code_vec[]) {
WORD32 track_idx, index, ixheaacd_drc_offset, pos[6], i;
memset(code_vec, 0, 64 * sizeof(FLOAT32));
if (code_bits == 12) {
for (track_idx = 0; track_idx < 4; track_idx += 2) {
ixheaacd_drc_offset = cb_index[2 * (track_idx / 2)];
index = cb_index[2 * (track_idx / 2) + 1];
ixheaacd_d_acelp_decode_1p_n1(index, 4, 0, pos);
ixheaacd_d_acelp_add_pulse(
pos, 1, 2 * ixheaacd_drc_offset + track_idx / 2, code_vec);
}
} else if (code_bits == 16) {
i = 0;
ixheaacd_drc_offset = cb_index[i++];
ixheaacd_drc_offset = (ixheaacd_drc_offset == 0) ? 1 : 3;
for (track_idx = 0; track_idx < 4; track_idx++) {
if (track_idx != ixheaacd_drc_offset) {
index = cb_index[i++];
ixheaacd_d_acelp_decode_1p_n1(index, 4, 0, pos);
ixheaacd_d_acelp_add_pulse(pos, 1, track_idx, code_vec);
}
}
} else if (code_bits == 20) {
for (track_idx = 0; track_idx < 4; track_idx++) {
index = cb_index[track_idx];
ixheaacd_acelp_decode_1sp_per_track(index, 4, 0, track_idx, code_vec);
}
} else if (code_bits == 28) {
for (track_idx = 0; track_idx < 2; track_idx++) {
index = cb_index[track_idx];
ixheaacd_acelp_decode_2sp_per_track(index, 4, 0, track_idx, code_vec);
}
for (track_idx = 2; track_idx < 4; track_idx++) {
index = cb_index[track_idx];
ixheaacd_acelp_decode_1sp_per_track(index, 4, 0, track_idx, code_vec);
}
} else if (code_bits == 36) {
for (track_idx = 0; track_idx < 4; track_idx++) {
index = cb_index[track_idx];
ixheaacd_acelp_decode_2sp_per_track(index, 4, 0, track_idx, code_vec);
}
} else if (code_bits == 44) {
for (track_idx = 0; track_idx < 2; track_idx++) {
index = cb_index[track_idx];
ixheaacd_acelp_decode_3sp_per_track(index, 4, 0, track_idx, code_vec);
}
for (track_idx = 2; track_idx < 4; track_idx++) {
index = cb_index[track_idx];
ixheaacd_acelp_decode_2sp_per_track(index, 4, 0, track_idx, code_vec);
}
} else if (code_bits == 52) {
for (track_idx = 0; track_idx < 4; track_idx++) {
index = cb_index[track_idx];
ixheaacd_acelp_decode_3sp_per_track(index, 4, 0, track_idx, code_vec);
}
} else if (code_bits == 64) {
for (track_idx = 0; track_idx < 4; track_idx++) {
index = ((cb_index[track_idx] << 14) + cb_index[track_idx + 4]);
ixheaacd_acelp_decode_4sp_per_track(index, track_idx, code_vec);
}
}
return;
}
static void ixheaacd_acelp_decode_gains(WORD32 index, FLOAT32 code_vec[],
FLOAT32 *pitch_gain,
FLOAT32 *codebook_gain,
FLOAT32 mean_exc_energy,
FLOAT32 *energy) {
WORD32 i;
FLOAT32 avg_innov_energy, est_gain;
const FLOAT32 *gain_table = ixheaacd_int_leave_gain_table;
avg_innov_energy = 0.01f;
for (i = 0; i < LEN_SUBFR; i++) {
avg_innov_energy += code_vec[i] * code_vec[i];
}
*energy = avg_innov_energy;
avg_innov_energy =
(FLOAT32)(10.0 * log10(avg_innov_energy / (FLOAT32)LEN_SUBFR));
est_gain = mean_exc_energy - avg_innov_energy;
est_gain = (FLOAT32)pow(10.0, 0.05 * est_gain);
*pitch_gain = gain_table[index * 2];
*codebook_gain = gain_table[index * 2 + 1] * est_gain;
return;
}
static VOID ixheaacd_cb_exc_calc(FLOAT32 xcitation_curr[], WORD32 pitch_lag,
WORD32 frac) {
WORD32 i, j;
FLOAT32 s, *x0, *x1, *x2;
const FLOAT32 *c1, *c2;
x0 = &xcitation_curr[-pitch_lag];
frac = -frac;
if (frac < 0) {
frac += UP_SAMP;
x0--;
}
for (j = 0; j < LEN_SUBFR + 1; j++) {
x1 = x0++;
x2 = x1 + 1;
c1 = &ixheaacd_interpol_filt[frac];
c2 = &ixheaacd_interpol_filt[UP_SAMP - frac];
s = 0.0;
for (i = 0; i < INTER_LP_FIL_ORDER; i++, c1 += UP_SAMP, c2 += UP_SAMP) {
s += (*x1--) * (*c1) + (*x2++) * (*c2);
}
xcitation_curr[j] = s;
}
return;
}
WORD32 ixheaacd_acelp_alias_cnx(ia_usac_data_struct *usac_data,
ia_td_frame_data_struct *pstr_td_frame_data,
WORD32 k, FLOAT32 lp_filt_coeff[],
FLOAT32 stability_factor,
ia_usac_lpd_decoder_handle st) {
WORD32 i, subfr_idx;
WORD32 pitch_lag, pitch_lag_frac, index, pitch_flag, pitch_lag_max;
WORD32 pitch_lag_min = 0;
FLOAT32 tmp, pitch_gain, gain_code, voicing_factor, r_v, innov_energy,
pitch_energy, mean_ener_code;
FLOAT32 gain_smooth, gain_code0, cpe;
FLOAT32 code[LEN_SUBFR] = {0}, synth_temp[128 + 16] = {0};
FLOAT32 post_process_exc[LEN_SUBFR] = {0};
FLOAT32 gain_smooth_factor;
FLOAT32 *ptr_lp_filt_coeff;
WORD32 pitch_min;
WORD32 pitch_fr2;
WORD32 pitch_fr1;
WORD32 pitch_max;
WORD32 subfr_nb = 0;
static const WORD16 num_codebits_table[8] = {20, 28, 36, 44, 52, 64, 12, 16};
FLOAT32 x[FAC_LENGTH] = {0}, xn2[2 * FAC_LENGTH + 16] = {0};
WORD32 int_x[FAC_LENGTH] = {0};
WORD32 TTT;
WORD32 len_subfr = usac_data->len_subfrm;
WORD32 fac_length;
WORD8 shiftp;
WORD32 preshift;
WORD32 *ptr_scratch = &usac_data->scratch_buffer[0];
WORD32 *int_xn2 = &usac_data->x_ac_dec[0];
WORD32 loop_count = 0;
WORD32 core_mode = pstr_td_frame_data->acelp_core_mode;
FLOAT32 *synth_signal =
&usac_data->synth_buf[len_subfr * k + MAX_PITCH +
(((NUM_FRAMES * usac_data->num_subfrm) / 2) - 1) *
LEN_SUBFR];
FLOAT32 *xcitation_curr =
&usac_data->exc_buf[len_subfr * k + MAX_PITCH + (INTER_LP_FIL_ORDER + 1)];
FLOAT32 *ptr_pitch_gain =
&usac_data->pitch_gain[k * usac_data->num_subfrm +
(((NUM_FRAMES * usac_data->num_subfrm) / 2) - 1)];
WORD32 *ptr_pitch =
&usac_data->pitch[k * usac_data->num_subfrm +
(((NUM_FRAMES * usac_data->num_subfrm) / 2) - 1)];
WORD32 err = 0;
fac_length = len_subfr / 2;
if (st->mode_prev > 0) {
for (i = 0; i < fac_length / 2; i++) {
x[i] = st->fac_gain * pstr_td_frame_data->fac[k * FAC_LENGTH + 2 * i];
x[fac_length / 2 + i] =
st->fac_gain *
pstr_td_frame_data->fac[k * FAC_LENGTH + fac_length - 2 * i - 1];
}
for (i = 0; i < fac_length / 8; i++) {
x[i] *= st->fac_fd_data[2 * i];
x[fac_length - i - 1] *= st->fac_fd_data[2 * i + 1];
}
preshift = 0;
shiftp = ixheaacd_float2fix(x, int_x, fac_length);
err =
ixheaacd_acelp_mdct(int_x, int_xn2, &preshift, fac_length, ptr_scratch);
if (err == -1) return err;
ixheaacd_fix2float(int_xn2, xn2 + fac_length, fac_length, &shiftp,
&preshift);
ixheaacd_vec_cnst_mul((2.0f / (FLOAT32)fac_length), xn2 + fac_length,
xn2 + fac_length, fac_length);
memset(xn2, 0, fac_length * sizeof(FLOAT32));
ixheaacd_lpc_wt_synthesis_tool(st->lp_flt_coeff_a_prev, xn2 + fac_length,
fac_length);
for (i = 0; i < 2 * fac_length; i++)
xn2[i] += synth_signal[i - (2 * fac_length)];
memcpy(synth_signal - fac_length, xn2 + fac_length,
fac_length * sizeof(FLOAT32));
tmp = 0.0;
ixheaacd_preemphsis_tool_float(xn2, PREEMPH_FILT_FAC, 2 * fac_length, tmp);
ptr_lp_filt_coeff = st->lp_flt_coeff_a_prev;
TTT = fac_length % LEN_SUBFR;
if (TTT != 0) {
ixheaacd_residual_tool_float(
ptr_lp_filt_coeff, &xn2[fac_length],
&xcitation_curr[fac_length - (2 * fac_length)], TTT, 1);
ptr_lp_filt_coeff += (ORDER + 1);
}
loop_count = (fac_length + TTT) / LEN_SUBFR;
ixheaacd_residual_tool_float(ptr_lp_filt_coeff, &xn2[fac_length + TTT],
&xcitation_curr[TTT - fac_length], LEN_SUBFR,
loop_count);
}
for (i = 0; i < ORDER; i++)
synth_temp[i] = synth_signal[i - ORDER] -
(PREEMPH_FILT_FAC * synth_signal[i - ORDER - 1]);
i = (((st->fscale * TMIN) + (FSCALE_DENOM / 2)) / FSCALE_DENOM) - TMIN;
pitch_min = TMIN + i;
pitch_fr2 = TFR2 - i;
pitch_fr1 = TFR1;
pitch_max = TMAX + (6 * i);
ptr_lp_filt_coeff = lp_filt_coeff;
for (subfr_idx = 0; subfr_idx < len_subfr; subfr_idx += LEN_SUBFR) {
pitch_flag = subfr_idx;
if ((len_subfr == 256) && (subfr_idx == (2 * LEN_SUBFR))) {
pitch_flag = 0;
}
index = pstr_td_frame_data->acb_index[k * 4 + subfr_nb];
if (pitch_flag == 0) {
if (index < (pitch_fr2 - pitch_min) * 4) {
pitch_lag = pitch_min + (index / 4);
pitch_lag_frac = index - (pitch_lag - pitch_min) * 4;
} else if (index <
((pitch_fr2 - pitch_min) * 4 + (pitch_fr1 - pitch_fr2) * 2)) {
index -= (pitch_fr2 - pitch_min) * 4;
pitch_lag = pitch_fr2 + (index / 2);
pitch_lag_frac = index - (pitch_lag - pitch_fr2) * 2;
pitch_lag_frac *= 2;
} else {
pitch_lag = index + pitch_fr1 - ((pitch_fr2 - pitch_min) * 4) -
((pitch_fr1 - pitch_fr2) * 2);
pitch_lag_frac = 0;
}
pitch_lag_min = pitch_lag - 8;
if (pitch_lag_min < pitch_min) pitch_lag_min = pitch_min;
pitch_lag_max = pitch_lag_min + 15;
if (pitch_lag_max > pitch_max) {
pitch_lag_max = pitch_max;
pitch_lag_min = pitch_lag_max - 15;
}
} else {
pitch_lag = pitch_lag_min + index / 4;
pitch_lag_frac = index - (pitch_lag - pitch_lag_min) * 4;
}
ixheaacd_cb_exc_calc(&xcitation_curr[subfr_idx], pitch_lag, pitch_lag_frac);
mean_ener_code =
(((FLOAT32)pstr_td_frame_data->mean_energy[k]) * 12.0f) + 18.0f;
if (pstr_td_frame_data->ltp_filtering_flag[k * 4 + subfr_nb] == 0) {
for (i = 0; i < LEN_SUBFR; i++)
code[i] = (FLOAT32)(0.18 * xcitation_curr[i - 1 + subfr_idx] +
0.64 * xcitation_curr[i + subfr_idx] +
0.18 * xcitation_curr[i + 1 + subfr_idx]);
ixheaacd_mem_cpy(code, &xcitation_curr[subfr_idx], LEN_SUBFR);
}
ixheaacd_acelp_decode_pulses_per_track(
&(pstr_td_frame_data->icb_index[k * 4 + subfr_nb][0]),
num_codebits_table[core_mode], code);
tmp = 0.0;
ixheaacd_preemphsis_tool_float(code, TILT_CODE, LEN_SUBFR, tmp);
i = pitch_lag;
if (pitch_lag_frac > 2) i++;
if (i >= 0) ixheaacd_acelp_pitch_sharpening(code, i);
index = pstr_td_frame_data->gains[k * 4 + subfr_nb];
ixheaacd_acelp_decode_gains(index, code, &pitch_gain, &gain_code,
mean_ener_code, &innov_energy);
pitch_energy = 0.0;
for (i = 0; i < LEN_SUBFR; i++)
pitch_energy +=
xcitation_curr[i + subfr_idx] * xcitation_curr[i + subfr_idx];
pitch_energy *= (pitch_gain * pitch_gain);
innov_energy *= gain_code * gain_code;
r_v = (FLOAT32)((pitch_energy - innov_energy) /
(pitch_energy + innov_energy));
for (i = 0; i < LEN_SUBFR; i++)
post_process_exc[i] = pitch_gain * xcitation_curr[i + subfr_idx];
for (i = 0; i < LEN_SUBFR; i++)
xcitation_curr[i + subfr_idx] =
pitch_gain * xcitation_curr[i + subfr_idx] + gain_code * code[i];
i = pitch_lag;
if (pitch_lag_frac > 2) i++;
if (i > pitch_max) i = pitch_max;
*ptr_pitch++ = i;
*ptr_pitch_gain++ = pitch_gain;
voicing_factor = (FLOAT32)(0.5 * (1.0 - r_v));
gain_smooth_factor = stability_factor * voicing_factor;
gain_code0 = gain_code;
if (gain_code0 < st->gain_threshold) {
gain_code0 = (FLOAT32)(gain_code0 * 1.19);
if (gain_code0 > st->gain_threshold) gain_code0 = st->gain_threshold;
} else {
gain_code0 = (FLOAT32)(gain_code0 / 1.19);
if (gain_code0 < st->gain_threshold) gain_code0 = st->gain_threshold;
}
st->gain_threshold = gain_code0;
gain_smooth = (FLOAT32)((gain_smooth_factor * gain_code0) +
((1.0 - gain_smooth_factor) * gain_code));
for (i = 0; i < LEN_SUBFR; i++) code[i] *= gain_smooth;
cpe = (FLOAT32)(0.125 * (1.0 + r_v));
post_process_exc[0] += code[0] - (cpe * code[1]);
for (i = 1; i < LEN_SUBFR - 1; i++)
post_process_exc[i] += code[i] - (cpe * (code[i - 1] + code[i + 1]));
post_process_exc[LEN_SUBFR - 1] +=
code[LEN_SUBFR - 1] - (cpe * code[LEN_SUBFR - 2]);
ixheaacd_synthesis_tool_float(ptr_lp_filt_coeff, post_process_exc,
&synth_signal[subfr_idx], LEN_SUBFR,
synth_temp);
memcpy(synth_temp, &synth_signal[subfr_idx + LEN_SUBFR - ORDER],
ORDER * sizeof(FLOAT32));
ptr_lp_filt_coeff += (ORDER + 1);
subfr_nb++;
}
ixheaacd_deemphsis_tool(synth_signal, len_subfr, synth_signal[-1]);
memset(synth_temp + 16, 0, 128 * sizeof(FLOAT32));
ixheaacd_synthesis_tool_float1(ptr_lp_filt_coeff, synth_temp + 16, 128);
ptr_lp_filt_coeff -= (2 * (ORDER + 1));
memcpy(st->lp_flt_coeff_a_prev, ptr_lp_filt_coeff,
(2 * (ORDER + 1)) * sizeof(FLOAT32));
memcpy(st->exc_prev, synth_signal + len_subfr - (1 + fac_length),
(1 + fac_length) * sizeof(FLOAT32));
memcpy(st->exc_prev + 1 + fac_length, synth_temp + 16,
fac_length * sizeof(FLOAT32));
ixheaacd_deemphsis_tool(st->exc_prev + 1 + fac_length, fac_length,
synth_signal[len_subfr - 1]);
return err;
}
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