/******************************************************************************
* *
* 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_cnst.h"
#include <ixheaacd_type_def.h>
#include "ixheaacd_bitbuffer.h"
#include "ixheaacd_acelp_com.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_constants.h"
#include <ixheaacd_basic_ops32.h>
#include <ixheaacd_basic_ops40.h>
#include "ixheaacd_main.h"
#include "ixheaacd_arith_dec.h"
#define FREQ_MAX 6400.0f
#define ABS(A) ((A) < 0 ? (-A) : (A))
static VOID ixheaacd_compute_coeff_poly_f(FLOAT32 lsp[], FLOAT32 *f1,
FLOAT32 *f2) {
FLOAT32 b1, b2;
FLOAT32 *ptr_lsp;
WORD32 i, j;
ptr_lsp = lsp;
f1[0] = f2[0] = 1.0f;
for (i = 1; i <= ORDER_BY_2; i++) {
b1 = -2.0f * (*ptr_lsp++);
b2 = -2.0f * (*ptr_lsp++);
f1[i] = (b1 * f1[i - 1]) + (2.0f * f1[i - 2]);
f2[i] = (b2 * f2[i - 1]) + (2.0f * f2[i - 2]);
for (j = i - 1; j > 0; j--) {
f1[j] += (b1 * f1[j - 1]) + f1[j - 2];
f2[j] += (b2 * f2[j - 1]) + f2[j - 2];
}
}
return;
}
VOID ixheaacd_lsp_to_lp_conversion(FLOAT32 *lsp, FLOAT32 *lp_flt_coff_a) {
WORD32 i;
FLOAT32 *ppoly_f1, *ppoly_f2;
FLOAT32 *plp_flt_coff_a_bott, *plp_flt_coff_a_top;
FLOAT32 poly1[ORDER_BY_2 + 2], poly2[ORDER_BY_2 + 2];
poly1[0] = 0.0f;
poly2[0] = 0.0f;
ixheaacd_compute_coeff_poly_f(lsp, &poly1[1], &poly2[1]);
ppoly_f1 = poly1 + ORDER_BY_2 + 1;
ppoly_f2 = poly2 + ORDER_BY_2 + 1;
for (i = 0; i < ORDER_BY_2; i++) {
ppoly_f1[0] += ppoly_f1[-1];
ppoly_f2[0] -= ppoly_f2[-1];
ppoly_f1--;
ppoly_f2--;
}
plp_flt_coff_a_bott = lp_flt_coff_a;
*plp_flt_coff_a_bott++ = 1.0f;
plp_flt_coff_a_top = lp_flt_coff_a + ORDER;
ppoly_f1 = poly1 + 2;
ppoly_f2 = poly2 + 2;
for (i = 0; i < ORDER_BY_2; i++) {
*plp_flt_coff_a_bott++ = 0.5f * (*ppoly_f1 + *ppoly_f2);
*plp_flt_coff_a_top-- = 0.5f * (*ppoly_f1++ - *ppoly_f2++);
}
return;
}
VOID ixheaacd_lpc_to_td(float *coeff, WORD32 order, float *gains, WORD32 lg) {
FLOAT32 data_r[LEN_SUPERFRAME * 2];
FLOAT32 data_i[LEN_SUPERFRAME * 2];
FLOAT64 avg_fac;
WORD32 idata_r[LEN_SUPERFRAME * 2];
WORD32 idata_i[LEN_SUPERFRAME * 2];
WORD8 qshift;
WORD32 preshift = 0;
WORD32 itemp;
FLOAT32 ftemp = 0;
FLOAT32 tmp, qfac;
WORD32 i, size_n;
size_n = 2 * lg;
avg_fac = PI / (FLOAT32)(size_n);
for (i = 0; i < order + 1; i++) {
tmp = (FLOAT32)(((FLOAT32)i) * avg_fac);
data_r[i] = (FLOAT32)(coeff[i] * cos(tmp));
data_i[i] = (FLOAT32)(-coeff[i] * sin(tmp));
}
for (; i < size_n; i++) {
data_r[i] = 0.f;
data_i[i] = 0.f;
}
for (i = 0; i < size_n; i++) {
if (ABS(data_r[i]) > ftemp) ftemp = ABS(data_r[i]);
if (ABS(data_i[i]) > ftemp) ftemp = ABS(data_i[i]);
}
itemp = (WORD32)ftemp;
qshift = ixheaacd_norm32(itemp);
for (i = 0; i < size_n; i++) {
idata_r[i] = (WORD32)(data_r[i] * ((WORD64)1 << qshift));
idata_i[i] = (WORD32)(data_i[i] * ((WORD64)1 << qshift));
}
ixheaacd_complex_fft(idata_r, idata_i, size_n, -1, &preshift);
qfac = 1.0f / ((FLOAT32)((WORD64)1 << (qshift - preshift)));
for (i = 0; i < size_n; i++) {
data_r[i] = (FLOAT32)((FLOAT32)idata_r[i] * qfac);
data_i[i] = (FLOAT32)((FLOAT32)idata_i[i] * qfac);
}
for (i = 0; i < size_n / 2; i++) {
gains[i] =
(FLOAT32)(1.0f / sqrt(data_r[i] * data_r[i] + data_i[i] * data_i[i]));
}
return;
}
VOID ixheaacd_noise_shaping(FLOAT32 r[], WORD32 lg, WORD32 M, FLOAT32 g1[],
FLOAT32 g2[]) {
WORD32 i, k;
FLOAT32 rr_prev, a = 0, b = 0;
FLOAT32 rr[1024];
k = lg / M;
rr_prev = 0;
memcpy(&rr, r, lg * sizeof(FLOAT32));
for (i = 0; i < lg; i++) {
if ((i % k) == 0) {
a = 2.0f * g1[i / k] * g2[i / k] / (g1[i / k] + g2[i / k]);
b = (g2[i / k] - g1[i / k]) / (g1[i / k] + g2[i / k]);
}
rr[i] = a * rr[i] + b * rr_prev;
rr_prev = rr[i];
}
for (i = 0; i < lg / 2; i++) {
r[i] = rr[2 * i];
r[lg / 2 + i] = rr[lg - 2 * i - 1];
}
return;
}
VOID ixheaacd_lpc_coef_gen(FLOAT32 lsf_old[], FLOAT32 lsf_new[], FLOAT32 a[],
WORD32 nb_subfr, WORD32 m) {
FLOAT32 lsf[ORDER], *ptr_a;
FLOAT32 inc, fnew, fold;
WORD32 i;
ptr_a = a;
inc = 1.0f / (FLOAT32)nb_subfr;
fnew = 0.5f - (0.5f * inc);
fold = 1.0f - fnew;
for (i = 0; i < m; i++) {
lsf[i] = (lsf_old[i] * fold) + (lsf_new[i] * fnew);
}
ixheaacd_lsp_to_lp_conversion(lsf, ptr_a);
ptr_a += (m + 1);
ixheaacd_lsp_to_lp_conversion(lsf_old, ptr_a);
ptr_a += (m + 1);
ixheaacd_lsp_to_lp_conversion(lsf_new, ptr_a);
ptr_a += (m + 1);
return;
}
VOID ixheaacd_interpolation_lsp_params(FLOAT32 lsp_old[], FLOAT32 lsp_new[],
FLOAT32 lp_flt_coff_a[],
WORD32 nb_subfr) {
FLOAT32 lsp[ORDER];
FLOAT32 factor;
WORD32 i, k;
FLOAT32 x_plus_y, x_minus_y;
factor = 1.0f / (FLOAT32)nb_subfr;
x_plus_y = 0.5f * factor;
for (k = 0; k < nb_subfr; k++) {
x_minus_y = 1.0f - x_plus_y;
for (i = 0; i < ORDER; i++) {
lsp[i] = (lsp_old[i] * x_minus_y) + (lsp_new[i] * x_plus_y);
}
x_plus_y += factor;
ixheaacd_lsp_to_lp_conversion(lsp, lp_flt_coff_a);
lp_flt_coff_a += (ORDER + 1);
}
ixheaacd_lsp_to_lp_conversion(lsp_new, lp_flt_coff_a);
return;
}