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256 lines
6.6 KiB
256 lines
6.6 KiB
/******************************************************************************
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* *
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*****************************************************************************
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* Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
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*/
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#include <float.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <math.h>
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#include <string.h>
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#include "ixheaacd_cnst.h"
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#include "ixheaacd_type_def.h"
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#include "ixheaacd_bitbuffer.h"
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#include "ixheaacd_acelp_com.h"
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#include "ixheaacd_bitbuffer.h"
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#include "ixheaacd_interface.h"
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#include "ixheaacd_tns_usac.h"
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#include "ixheaacd_cnst.h"
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#include "ixheaacd_acelp_info.h"
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#include "ixheaacd_td_mdct.h"
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#include "ixheaacd_sbrdecsettings.h"
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#include "ixheaacd_info.h"
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#include "ixheaacd_sbr_common.h"
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#include "ixheaacd_drc_data_struct.h"
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#include "ixheaacd_drc_dec.h"
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#include "ixheaacd_sbrdecoder.h"
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#include "ixheaacd_mps_polyphase.h"
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#include "ixheaacd_sbr_const.h"
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#include "ixheaacd_constants.h"
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#include "ixheaacd_basic_ops32.h"
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#include "ixheaacd_basic_ops40.h"
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#include "ixheaacd_main.h"
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#include "ixheaacd_arith_dec.h"
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#define FREQ_MAX 6400.0f
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#define ABS(A) ((A) < 0 ? (-A) : (A))
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static VOID ixheaacd_compute_coeff_poly_f(FLOAT32 lsp[], FLOAT32 *f1,
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FLOAT32 *f2) {
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FLOAT32 b1, b2;
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FLOAT32 *ptr_lsp;
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WORD32 i, j;
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ptr_lsp = lsp;
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f1[0] = f2[0] = 1.0f;
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for (i = 1; i <= ORDER_BY_2; i++) {
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b1 = -2.0f * (*ptr_lsp++);
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b2 = -2.0f * (*ptr_lsp++);
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f1[i] = (b1 * f1[i - 1]) + (2.0f * f1[i - 2]);
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f2[i] = (b2 * f2[i - 1]) + (2.0f * f2[i - 2]);
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for (j = i - 1; j > 0; j--) {
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f1[j] += (b1 * f1[j - 1]) + f1[j - 2];
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f2[j] += (b2 * f2[j - 1]) + f2[j - 2];
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}
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}
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return;
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}
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VOID ixheaacd_lsp_to_lp_conversion(FLOAT32 *lsp, FLOAT32 *lp_flt_coff_a) {
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WORD32 i;
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FLOAT32 *ppoly_f1, *ppoly_f2;
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FLOAT32 *plp_flt_coff_a_bott, *plp_flt_coff_a_top;
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FLOAT32 poly1[ORDER_BY_2 + 2], poly2[ORDER_BY_2 + 2];
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poly1[0] = 0.0f;
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poly2[0] = 0.0f;
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ixheaacd_compute_coeff_poly_f(lsp, &poly1[1], &poly2[1]);
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ppoly_f1 = poly1 + ORDER_BY_2 + 1;
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ppoly_f2 = poly2 + ORDER_BY_2 + 1;
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for (i = 0; i < ORDER_BY_2; i++) {
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ppoly_f1[0] += ppoly_f1[-1];
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ppoly_f2[0] -= ppoly_f2[-1];
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ppoly_f1--;
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ppoly_f2--;
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}
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plp_flt_coff_a_bott = lp_flt_coff_a;
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*plp_flt_coff_a_bott++ = 1.0f;
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plp_flt_coff_a_top = lp_flt_coff_a + ORDER;
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ppoly_f1 = poly1 + 2;
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ppoly_f2 = poly2 + 2;
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for (i = 0; i < ORDER_BY_2; i++) {
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*plp_flt_coff_a_bott++ = 0.5f * (*ppoly_f1 + *ppoly_f2);
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*plp_flt_coff_a_top-- = 0.5f * (*ppoly_f1++ - *ppoly_f2++);
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}
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return;
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}
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WORD32 ixheaacd_lpc_to_td(float *coeff, WORD32 order, float *gains, WORD32 lg) {
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FLOAT32 data_r[LEN_SUPERFRAME * 2];
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FLOAT32 data_i[LEN_SUPERFRAME * 2];
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FLOAT64 avg_fac;
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WORD32 idata_r[LEN_SUPERFRAME * 2];
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WORD32 idata_i[LEN_SUPERFRAME * 2];
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WORD8 qshift;
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WORD32 preshift = 0;
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WORD32 itemp;
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FLOAT32 ftemp = 0;
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FLOAT32 tmp, qfac;
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WORD32 i, size_n;
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WORD32 err = 0;
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size_n = 2 * lg;
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avg_fac = PI / (FLOAT32)(size_n);
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for (i = 0; i < order + 1; i++) {
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tmp = (FLOAT32)(((FLOAT32)i) * avg_fac);
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data_r[i] = (FLOAT32)(coeff[i] * cos(tmp));
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data_i[i] = (FLOAT32)(-coeff[i] * sin(tmp));
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}
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for (; i < size_n; i++) {
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data_r[i] = 0.f;
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data_i[i] = 0.f;
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}
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for (i = 0; i < size_n; i++) {
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if (ABS(data_r[i]) > ftemp) ftemp = ABS(data_r[i]);
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if (ABS(data_i[i]) > ftemp) ftemp = ABS(data_i[i]);
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}
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itemp = (WORD32)ftemp;
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qshift = ixheaacd_norm32(itemp);
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for (i = 0; i < size_n; i++) {
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idata_r[i] = (WORD32)(data_r[i] * ((WORD64)1 << qshift));
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idata_i[i] = (WORD32)(data_i[i] * ((WORD64)1 << qshift));
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}
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err = ixheaacd_complex_fft(idata_r, idata_i, size_n, -1, &preshift);
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if (err) return err;
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qfac = 1.0f / ((FLOAT32)((WORD64)1 << (qshift - preshift)));
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for (i = 0; i < size_n; i++) {
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data_r[i] = (FLOAT32)((FLOAT32)idata_r[i] * qfac);
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data_i[i] = (FLOAT32)((FLOAT32)idata_i[i] * qfac);
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}
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for (i = 0; i < size_n / 2; i++) {
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gains[i] =
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(FLOAT32)(1.0f / sqrt(data_r[i] * data_r[i] + data_i[i] * data_i[i]));
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}
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return err;
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}
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VOID ixheaacd_noise_shaping(FLOAT32 r[], WORD32 lg, WORD32 M, FLOAT32 g1[],
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FLOAT32 g2[]) {
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WORD32 i, k;
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FLOAT32 rr_prev, a = 0, b = 0;
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FLOAT32 rr[1024];
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k = lg / M;
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rr_prev = 0;
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memcpy(&rr, r, lg * sizeof(FLOAT32));
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for (i = 0; i < lg; i++) {
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if ((i % k) == 0) {
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a = 2.0f * g1[i / k] * g2[i / k] / (g1[i / k] + g2[i / k]);
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b = (g2[i / k] - g1[i / k]) / (g1[i / k] + g2[i / k]);
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}
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rr[i] = a * rr[i] + b * rr_prev;
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rr_prev = rr[i];
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}
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for (i = 0; i < lg / 2; i++) {
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r[i] = rr[2 * i];
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r[lg / 2 + i] = rr[lg - 2 * i - 1];
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}
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return;
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}
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VOID ixheaacd_lpc_coef_gen(FLOAT32 lsf_old[], FLOAT32 lsf_new[], FLOAT32 a[],
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WORD32 nb_subfr, WORD32 m) {
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FLOAT32 lsf[ORDER], *ptr_a;
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FLOAT32 inc, fnew, fold;
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WORD32 i;
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ptr_a = a;
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inc = 1.0f / (FLOAT32)nb_subfr;
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fnew = 0.5f - (0.5f * inc);
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fold = 1.0f - fnew;
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for (i = 0; i < m; i++) {
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lsf[i] = (lsf_old[i] * fold) + (lsf_new[i] * fnew);
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}
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ixheaacd_lsp_to_lp_conversion(lsf, ptr_a);
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ptr_a += (m + 1);
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ixheaacd_lsp_to_lp_conversion(lsf_old, ptr_a);
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ptr_a += (m + 1);
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ixheaacd_lsp_to_lp_conversion(lsf_new, ptr_a);
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ptr_a += (m + 1);
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return;
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}
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VOID ixheaacd_interpolation_lsp_params(FLOAT32 lsp_old[], FLOAT32 lsp_new[],
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FLOAT32 lp_flt_coff_a[],
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WORD32 nb_subfr) {
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FLOAT32 lsp[ORDER];
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FLOAT32 factor;
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WORD32 i, k;
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FLOAT32 x_plus_y, x_minus_y;
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factor = 1.0f / (FLOAT32)nb_subfr;
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x_plus_y = 0.5f * factor;
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for (k = 0; k < nb_subfr; k++) {
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x_minus_y = 1.0f - x_plus_y;
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for (i = 0; i < ORDER; i++) {
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lsp[i] = (lsp_old[i] * x_minus_y) + (lsp_new[i] * x_plus_y);
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}
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x_plus_y += factor;
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ixheaacd_lsp_to_lp_conversion(lsp, lp_flt_coff_a);
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lp_flt_coff_a += (ORDER + 1);
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}
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ixheaacd_lsp_to_lp_conversion(lsp_new, lp_flt_coff_a);
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return;
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}
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