/******************************************************************************
* *
* 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 WORD32 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 (((pitch_lag >> 1) + 96 - num_subfr) > MAX_PITCH) return -1;
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 0;
}
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;
}
if ((pstr_td_frame_data->fac_data[0] < 0) ||
(pstr_td_frame_data->fac_data[0] > 128)) {
return -1;
}
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) {
err = ixheaacd_bass_post_filter(synth, pitch, pitch_gain, fsynth, len_fr,
synth_delay, st->bpf_prev);
} else {
err =
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;
}
WORD32 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;
WORD32 err = 0;
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 ((i * LEN_SUBFR + MAX_PITCH) < tp) {
return -1;
} else if ((i * LEN_SUBFR + MAX_PITCH - tp) >= 1883) {
return -1;
}
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;
}
}
err = 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);
if (err != 0) return err;
ixheaacd_mem_cpy(signal_out, out_buffer,
(lpd_sbf_len + 2) * LEN_SUBFR + LEN_SUBFR);
return err;
}