mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
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192 lines
6.3 KiB
C++
192 lines
6.3 KiB
C++
/*
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** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
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** Copyright (C) 2003-2005 M. Bakker, Nero AG, http://www.nero.com
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 2 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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**
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** Any non-GPL usage of this software or parts of this software is strictly
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** forbidden.
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**
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** The "appropriate copyright message" mentioned in section 2c of the GPLv2
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** must read: "Code from FAAD2 is copyright (c) Nero AG, www.nero.com"
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**
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** Commercial non-GPL licensing of this software is possible.
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** For more info contact Nero AG through Mpeg4AAClicense@nero.com.
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**
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** $Id: ssr_ipqf.c,v 1.18 2007/11/01 12:33:39 menno Exp $
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**/
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#include "common.h"
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#include "structs.h"
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#ifdef SSR_DEC
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#include "ssr.h"
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#include "ssr_ipqf.h"
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static real_t **app_pqfbuf;
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static real_t **pp_q0, **pp_t0, **pp_t1;
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void gc_set_protopqf(real_t *p_proto)
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{
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int j;
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static real_t a_half[48] =
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{
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1.2206911375946939E-05, 1.7261986723798209E-05, 1.2300093657077942E-05,
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-1.0833943097791965E-05, -5.7772498639901686E-05, -1.2764767618947719E-04,
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-2.0965186675013334E-04, -2.8166673689263850E-04, -3.1234860429017460E-04,
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-2.6738519958452353E-04, -1.1949424681824722E-04, 1.3965139412648678E-04,
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4.8864136409185725E-04, 8.7044629275148344E-04, 1.1949430269934793E-03,
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1.3519708175026700E-03, 1.2346314373964412E-03, 7.6953209114159191E-04,
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-5.2242432579537141E-05, -1.1516092887213454E-03, -2.3538469841711277E-03,
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-3.4033123072127277E-03, -4.0028551071986133E-03, -3.8745415659693259E-03,
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-2.8321073426874310E-03, -8.5038892323704195E-04, 1.8856751185350931E-03,
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4.9688741735340923E-03, 7.8056704536795926E-03, 9.7027909685901654E-03,
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9.9960423120166159E-03, 8.2019366335594487E-03, 4.1642072876103365E-03,
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-1.8364453822737758E-03, -9.0384863094167686E-03, -1.6241528177129844E-02,
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-2.1939551286300665E-02, -2.4533179947088161E-02, -2.2591663337768787E-02,
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-1.5122066420044672E-02, -1.7971713448186293E-03, 1.6903413428575379E-02,
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3.9672315874127042E-02, 6.4487527248102796E-02, 8.8850025474701726E-02,
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0.1101132906105560 , 0.1258540205143761 , 0.1342239368467012
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};
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for (j = 0; j < 48; ++j)
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{
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p_proto[j] = p_proto[95-j] = a_half[j];
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}
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}
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void gc_setcoef_eff_pqfsyn(int mm,
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int kk,
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real_t *p_proto,
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real_t ***ppp_q0,
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real_t ***ppp_t0,
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real_t ***ppp_t1)
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{
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int i, k, n;
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real_t w;
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/* Set 1st Mul&Acc Coef's */
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*ppp_q0 = (real_t **) calloc(mm, sizeof(real_t *));
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for (n = 0; n < mm; ++n)
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{
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(*ppp_q0)[n] = (real_t *) calloc(mm, sizeof(real_t));
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}
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for (n = 0; n < mm/2; ++n)
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{
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for (i = 0; i < mm; ++i)
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{
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w = (2*i+1)*(2*n+1-mm)*M_PI/(4*mm);
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(*ppp_q0)[n][i] = 2.0 * cos((real_t) w);
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w = (2*i+1)*(2*(mm+n)+1-mm)*M_PI/(4*mm);
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(*ppp_q0)[n + mm/2][i] = 2.0 * cos((real_t) w);
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}
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}
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/* Set 2nd Mul&Acc Coef's */
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*ppp_t0 = (real_t **) calloc(mm, sizeof(real_t *));
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*ppp_t1 = (real_t **) calloc(mm, sizeof(real_t *));
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for (n = 0; n < mm; ++n)
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{
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(*ppp_t0)[n] = (real_t *) calloc(kk, sizeof(real_t));
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(*ppp_t1)[n] = (real_t *) calloc(kk, sizeof(real_t));
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}
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for (n = 0; n < mm; ++n)
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{
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for (k = 0; k < kk; ++k)
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{
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(*ppp_t0)[n][k] = mm * p_proto[2*k *mm + n];
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(*ppp_t1)[n][k] = mm * p_proto[(2*k+1)*mm + n];
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if (k%2 != 0)
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{
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(*ppp_t0)[n][k] = -(*ppp_t0)[n][k];
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(*ppp_t1)[n][k] = -(*ppp_t1)[n][k];
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}
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}
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}
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}
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void ssr_ipqf(ssr_info *ssr, real_t *in_data, real_t *out_data,
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real_t buffer[SSR_BANDS][96/4],
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uint16_t frame_len, uint8_t bands)
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{
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static int initFlag = 0;
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real_t a_pqfproto[PQFTAPS];
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int i;
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if (initFlag == 0)
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{
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gc_set_protopqf(a_pqfproto);
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gc_setcoef_eff_pqfsyn(SSR_BANDS, PQFTAPS/(2*SSR_BANDS), a_pqfproto,
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&pp_q0, &pp_t0, &pp_t1);
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initFlag = 1;
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}
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for (i = 0; i < frame_len / SSR_BANDS; i++)
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{
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int l, n, k;
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int mm = SSR_BANDS;
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int kk = PQFTAPS/(2*SSR_BANDS);
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for (n = 0; n < mm; n++)
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{
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for (k = 0; k < 2*kk-1; k++)
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{
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buffer[n][k] = buffer[n][k+1];
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}
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}
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for (n = 0; n < mm; n++)
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{
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real_t acc = 0.0;
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for (l = 0; l < mm; l++)
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{
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acc += pp_q0[n][l] * in_data[l*frame_len/SSR_BANDS + i];
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}
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buffer[n][2*kk-1] = acc;
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}
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for (n = 0; n < mm/2; n++)
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{
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real_t acc = 0.0;
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for (k = 0; k < kk; k++)
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{
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acc += pp_t0[n][k] * buffer[n][2*kk-1-2*k];
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}
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for (k = 0; k < kk; ++k)
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{
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acc += pp_t1[n][k] * buffer[n + mm/2][2*kk-2-2*k];
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}
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out_data[i*SSR_BANDS + n] = acc;
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acc = 0.0;
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for (k = 0; k < kk; k++)
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{
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acc += pp_t0[mm-1-n][k] * buffer[n][2*kk-1-2*k];
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}
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for (k = 0; k < kk; k++)
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{
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acc -= pp_t1[mm-1-n][k] * buffer[n + mm/2][2*kk-2-2*k];
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}
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out_data[i*SSR_BANDS + mm-1-n] = acc;
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}
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}
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}
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#endif
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